JP6078645B2 - Bed with load detection function - Google Patents

Description

The present invention, by the load detector is attached to the bed body, to detect a change in load applied to the bed body, about the load detection function beds de for detecting the state of the user on sleep surface of the bed body.
The present application includes Japanese Patent Application No. 2013-147657 filed in Japan on July 16, 2013, Japanese Patent Application No. 2013-149467 filed in Japan on July 18, 2013, and Japan on October 7, 2013. Priority is claimed based on Japanese Patent Application No. 2013-210514 filed in Japan, the contents of which are incorporated herein by reference.

  For example, in beds used in medical institutions, nursing homes, nursing homes, lodging facilities, general homes, etc., changes in the load applied to the bed body are detected, and users (sick people, patients on the bed surface of the bed body) are detected. A method for detecting the state of a caregiver, an infant, a healthy person, etc. (entering floor, getting out of bed, bed position, body movement, etc.) has been proposed (see, for example, Patent Documents 1 to 3).

Specifically, in Patent Document 1, a load sensor is disposed between a leg provided on the bed main body and an installation surface (floor surface or the like) on which the bed main body is installed. A method for detecting a person's presence based on an electrical signal is disclosed. Further, the load sensor is formed with a slope portion for guiding a caster provided on the leg portion of the bed main body from the installation surface of the bed main body onto the load receiving portion of the load sensor.

On the other hand, Patent Document 2 discloses a method of detecting a load applied to a bed body by providing a load detector in a space between the bed body and an installation surface on which the bed body is installed. The load detector is provided with a means for lifting the bed.

JP 2000-105884 A JP 2008-304397 A JP 2007-256074 A

  However, in the invention described in Patent Document 1, when the load of the bed main body is detected using the load sensor, the caster provided on the leg portion of the bed is moved to the vicinity of the front side of the slope portion of the load sensor. After passing over the slope portion, it must be placed on the load receiving portion of the load sensor, which is very troublesome.

  On the other hand, in the invention described in Patent Document 2, for example, when the bed main body is installed along the wall, the installer cannot enter between the bed main body and the wall. It becomes very difficult to arrange in a space between the installation surface.

On the other hand, in the invention described in Patent Document 3, although the load detector is incorporated in the bed main body in advance, the bed main body must be designed in accordance with the load detector, and a new part for that purpose is required. . For this reason, it becomes very expensive as a bed with a load detection function. Furthermore, weight reduction becomes difficult due to an increase in the number of parts.

The present invention is, as an issue of providing such a view of the conventional circumstances, while suppressing the increase in the number of parts, the load detection function beds de which enables adding a load detection function by a simple structure Yes.

Furthermore, in the present invention, for example, a user on the bed sits or sits at the end of the bed surface of the bed, or a user who is sleeping on the bed surface largely turns over to the end side of the bed surface. Even when the bed is distorted because the load applied to the bed surface is greatly deviated due to hitting, etc. (that is, when the bed is distorted), the detection of the load that should be detected in the vertical direction should be detected. without precision is lowered, and the challenges of providing a load detecting function beds de capable of detecting a load with high accuracy.

In particular, the present invention includes a lifting support mechanism for supporting the bed surface forming portion that forms the bed surface above the lower frame and raising and lowering the bed surface forming portion. An object of the present invention is to provide a bed provided with a load detection function as a bed configured to raise and lower a bed surface forming portion by changing an inclination angle of an inclined movable arm extending obliquely above the frame.

In order to achieve the above object, the present invention provides each aspect described in the following (1) to (24) .

(1) A bed with a load detection function for detecting a change in load applied to the bed body by a load detector attached to the bed body and detecting a user's state on the bed surface of the bed body. And
The bed main body includes a bed surface forming portion that forms the bed surface, a lower frame that is placed on an installation surface on which the bed main body is to be installed, and the bed surface forming portion is located above the lower frame. An elevating support mechanism that is interposed between the bed surface forming portion and the lower frame so as to be positioned and supports the bed surface forming portion and lifts and lowers the bed surface forming portion with respect to the lower frame. And a configuration having
The lower frame has a plurality of linear frame sides parallel to the length direction of the bed surface,
The lifting support mechanism is
Between the lower frame and the bed surface forming portion, a load from the bed surface forming portion is applied by inclining and extending in opposite directions within a vertical plane parallel to the length direction of the frame side, A plurality of first tilt movable arms and second tilt movable arms respectively;
A first support shaft that is attached to a lower end of the first tiltable movable arm, an axial direction is orthogonal to a length direction of the frame side, and movement in the length direction of the frame side is prevented;
The second inclined movable arm is attached to the lower end of the second inclined movable arm away from the first support shaft in the length direction of the frame side, the axial direction is orthogonal to the frame side length direction, and the frame side length A second support shaft allowed to move in the direction;
A drive mechanism for changing an inclination angle of the first and second inclined movable arms;
Have
The lifting support mechanism is
The bed mechanism is moved up and down by changing the tilt angle of the first and second tilt movable arms with respect to the lower frame by the drive mechanism, and the second support shaft is moved accordingly. Configured to be proximate to the first support shaft;
The load detector is interposed between the frame side and the first support shaft, and between the frame side and the second support shaft, and is generated by a load applied from each of the support shafts. Has a load cell to measure
The load cell has a base and a strain sensor,
The substrate is
A receiving portion for receiving a load from the first or second support shaft;
An operating part that is integrally continuous with the receiving part and is deformed and deformed by a load applied to the receiving part;
A mounting portion that is integrally continuous with the operating portion and fixed to the frame side;
Have
The strain sensor is attached to the operating portion so as to detect distortion deformation of the operating portion,
And a blocking member having a pair of blocking portions positioned on both sides of the first support shaft in the frame side length direction for blocking the movement of the first support shaft in the frame side length direction. Is attached to the frame side,
A bed with a load detection function configured such that the blocking member does not come into contact with a member of a load transmission path from the first support shaft to the base, and a receiving part and an operating part of the base.

(2) A bed with a load detection function for detecting a change in a load applied to the bed body by a load detector attached to the bed body and detecting a user's state on the bed surface of the bed body. And
The bed main body includes a bed surface forming portion that forms the bed surface, a lower frame that is placed on an installation surface on which the bed main body is to be installed, and the bed surface forming portion is located above the lower frame. An elevating support mechanism that is interposed between the bed surface forming portion and the lower frame so as to be positioned and supports the bed surface forming portion and lifts and lowers the bed surface forming portion with respect to the lower frame. And a configuration having
The lower frame has a plurality of linear frame sides parallel to the length direction of the bed surface,
The lifting support mechanism is
Between the lower frame and the bed surface forming portion, a load from the bed surface forming portion is applied by inclining and extending in opposite directions within a vertical plane parallel to the length direction of the frame side, A plurality of first tilt movable arms and second tilt movable arms respectively;
A first support shaft that is attached to a lower end of the first tiltable movable arm, an axial direction is orthogonal to a length direction of the frame side, and movement in the length direction of the frame side is prevented;
The second inclined movable arm is attached to the lower end of the second inclined movable arm away from the first support shaft in the length direction of the frame side, the axial direction is orthogonal to the frame side length direction, and the frame side length A second support shaft allowed to move in the direction;
A drive mechanism for changing an inclination angle of the first and second inclined movable arms;
Have
The lifting support mechanism is
The bed mechanism is moved up and down by changing the tilt angle of the first and second tilt movable arms with respect to the lower frame by the drive mechanism, and the second support shaft is moved accordingly. Configured to be proximate to the first support shaft;
The load detector is interposed between the frame side and the first support shaft, and between the frame side and the second support shaft, and is generated by a load applied from each of the support shafts. Has a load cell to measure
The load cell has a base and a strain sensor,
The substrate is
A receiving portion for receiving a load from the first or second support shaft;
An operating part that is integrally continuous with the receiving part and is deformed and deformed by a load applied to the receiving part;
A mounting portion that is integrally continuous with the operating portion and fixed to the frame side;
Have
The strain sensor is attached to the operating portion so as to detect distortion deformation of the operating portion,
Further, the second support shaft is positioned on both sides of the allowable movable range in the frame side length direction of the second support shaft, and the second support shaft falls off beyond the allowable movable range in the frame side length direction. A fall-off prevention member having a pair of fall-off prevention parts for preventing the is attached to the frame side,
A bed with a load detection function configured such that the drop-off prevention member does not contact a member of a transmission path of a load from the second support shaft to the base, and a receiving part and an operating part of the base.

(3) In the bed with a load detection function of any one of (1) and (2 ) above:
The bed with a load detection function, wherein the elevating support mechanism has a function of inclining the bed surface forming portion with respect to a plane parallel to the lower frame.

(4) In the bed with a load detection function of any one of (1) and (2 ) above:
The first support shaft is fixed to the first tilt movable arm, the second support shaft is fixed to the second tilt movable arm, and the first and second tilt movable arms A bed with a load detection function configured such that the first and second support shafts rotate about the axis by tilting.

(5) In the bed with load detection function of (4 ) above:
A rolling element is provided at each end of the first and second support shafts so as to be rotatable with respect to each support shaft about the axis of each support shaft. A bed with a load detection function configured to be added to the receiving portion of the base body via the bed.

(6) In the bed with load detection function of (5 ) above:
A gear having a tooth surface along the axial direction is formed on the outer periphery of the rolling element,
A bed with a load detection function, wherein a rack gear having a convex portion engaged with the gear is formed on a mounting surface of the rolling element.

(7) A bed with a load detection function for detecting a change in a load applied to the bed body by a load detector attached to the bed body and detecting a user's state on the bed surface of the bed body. And
The bed main body includes a bed surface forming portion that forms the bed surface, a lower frame that is placed on an installation surface on which the bed main body is to be installed, and the bed surface forming portion is located above the lower frame. An elevating support mechanism that is interposed between the bed surface forming portion and the lower frame so as to be positioned and supports the bed surface forming portion and lifts and lowers the bed surface forming portion with respect to the lower frame. And a configuration having
The lower frame has a plurality of linear frame sides parallel to the length direction of the bed surface,
The lifting support mechanism is
Between the lower frame and the bed surface forming portion, a load from the bed surface forming portion is applied by inclining and extending in opposite directions within a vertical plane parallel to the length direction of the frame side, A plurality of first tilt movable arms and second tilt movable arms respectively;
A first support shaft that is attached to a lower end of the first tiltable movable arm, an axial direction is orthogonal to a length direction of the frame side, and movement in the length direction of the frame side is prevented;
The second inclined movable arm is attached to the lower end of the second inclined movable arm away from the first support shaft in the length direction of the frame side, the axial direction is orthogonal to the frame side length direction, and the frame side length A second support shaft allowed to move in the direction;
A drive mechanism for changing an inclination angle of the first and second inclined movable arms;
Have
The lifting support mechanism is
The bed mechanism is moved up and down by changing the tilt angle of the first and second tilt movable arms with respect to the lower frame by the drive mechanism, and the second support shaft is moved accordingly. Configured to be proximate to the first support shaft;
The load detector is interposed between the frame side and the first support shaft, and between the frame side and the second support shaft, and is generated by a load applied from each of the support shafts. Has a load cell to measure
The load cell has a base and a strain sensor,
The substrate is
A receiving portion for receiving a load from the first or second support shaft;
An operating part that is integrally continuous with the receiving part and is deformed and deformed by a load applied to the receiving part;
A mounting portion that is integrally continuous with the operating portion and fixed to the frame side;
Have
The strain sensor is attached to the operating portion so as to detect distortion deformation of the operating portion,
Furthermore, the base body of the load cell interposed between the first support shaft and the frame side and the base body of the load cell interposed between the second support shaft and the frame side have the same structure. A bed with a load detection function.

(8) A bed with a load detection function for detecting a change in load applied to the bed body by a load detector attached to the bed body and detecting a user's state on the bed surface of the bed body. And
The bed main body includes a bed surface forming portion that forms the bed surface, a lower frame that is placed on an installation surface on which the bed main body is to be installed, and the bed surface forming portion is located above the lower frame. An elevating support mechanism that is interposed between the bed surface forming portion and the lower frame so as to be positioned and supports the bed surface forming portion and lifts and lowers the bed surface forming portion with respect to the lower frame. And a configuration having
The lower frame has a plurality of linear frame sides parallel to the length direction of the bed surface,
The lifting support mechanism is
Between the lower frame and the bed surface forming portion, a load from the bed surface forming portion is applied by inclining and extending in opposite directions within a vertical plane parallel to the length direction of the frame side, A plurality of first tilt movable arms and second tilt movable arms respectively;
A first support shaft that is attached to a lower end of the first tiltable movable arm, an axial direction is orthogonal to a length direction of the frame side, and movement in the length direction of the frame side is prevented;
The second inclined movable arm is attached to the lower end of the second inclined movable arm away from the first support shaft in the length direction of the frame side, the axial direction is orthogonal to the frame side length direction, and the frame side length A second support shaft allowed to move in the direction;
A drive mechanism for changing an inclination angle of the first and second inclined movable arms;
Have
The lifting support mechanism is
The bed mechanism is moved up and down by changing the tilt angle of the first and second tilt movable arms with respect to the lower frame by the drive mechanism, and the second support shaft is moved accordingly. Configured to be proximate to the first support shaft;
The load detector is interposed between the frame side and the first support shaft, and between the frame side and the second support shaft, and is generated by a load applied from each of the support shafts. Has a load cell to measure
The load cell has a base and a strain sensor,
The substrate is
A receiving portion for receiving a load from the first or second support shaft;
An operating portion that is integrally continuous with the receiving portion and is deformed and deformed by a load applied to the receiving portion; and an attachment portion that is integrally continuous with the operating portion and is fixed to the frame side.
Have
The strain sensor is attached to the operating portion so as to detect distortion deformation of the operating portion,
Further, the operating portion of the base body is composed of two divided operating portions formed at intervals in the frame side length direction, and a space portion is formed between both divided operating portions, A bed with a load detection function in which the strain sensor is attached to each of the divided operation portions.

(9) In the bed with load detection function of (8 ) above:
A bed with a load detection function in which a tip of the first or second support shaft is inserted into the space.

(10) In the bed with a load detection function of any one of (1) and (2 ) above:
The frame side of the lower frame is made of a rectangular tube, and two side surfaces of the rectangular tube frame side are arranged along the vertical direction, and the base mounting portion A bed with a load detection function configured to be attached to any one or more of the two side surfaces, the upper surface, and the lower surface of the rectangular tubular frame side.

(11) In the bed with load detection function of (10 ) above:
The bed with a load detection function, wherein the operating portion and the receiving portion are extended from the attachment portion of the base toward the inside of the lower frame.

(12) A bed with a load detection function for detecting a change in a load applied to the bed body by a load detector attached to the bed body and detecting a user's state on the bed surface of the bed body. And
The bed main body includes a bed surface forming portion that forms the bed surface, a lower frame that is placed on an installation surface on which the bed main body is to be installed, and the bed surface forming portion is located above the lower frame. An elevating support mechanism that is interposed between the bed surface forming portion and the lower frame so as to be positioned and supports the bed surface forming portion and lifts and lowers the bed surface forming portion with respect to the lower frame. And a configuration having
The lower frame has a plurality of linear frame sides parallel to the length direction of the bed surface,
The lifting support mechanism is
Between the lower frame and the bed surface forming portion, a load from the bed surface forming portion is applied by inclining and extending in opposite directions within a vertical plane parallel to the length direction of the frame side, A plurality of first tilt movable arms and second tilt movable arms respectively;
A first support shaft that is attached to a lower end of the first tiltable movable arm, an axial direction is orthogonal to a length direction of the frame side, and movement in the length direction of the frame side is prevented;
The second inclined movable arm is attached to the lower end of the second inclined movable arm away from the first support shaft in the length direction of the frame side, the axial direction is orthogonal to the frame side length direction, and the frame side length A second support shaft allowed to move in the direction;
A drive mechanism for changing an inclination angle of the first and second inclined movable arms;
Have
The lifting support mechanism is
The bed mechanism is moved up and down by changing the tilt angle of the first and second tilt movable arms with respect to the lower frame by the drive mechanism, and the second support shaft is moved accordingly. Configured to be proximate to the first support shaft;
The load detector is interposed between the frame side and the first support shaft, and between the frame side and the second support shaft, and is generated by a load applied from each of the support shafts. Has a load cell to measure
The load cell has a base and a strain sensor,
The substrate is
A receiving portion for receiving a load from the first or second support shaft;
An operating portion that is integrally continuous with the receiving portion and is deformed and deformed by a load applied to the receiving portion; and an attachment portion that is integrally continuous with the operating portion and is fixed to the frame side.
Have
The strain sensor is attached to the operating portion so as to detect distortion deformation of the operating portion,
In addition, the load cell,
Its receives a load of the support shaft, received placed on said receiving portion of said base to transmit to said receiving unit a load from the support shaft prior Symbol with an end of the first or second support shaft is in contact A bed with a load detection function that has a plate.

(13) In the bed with load detection function of (12 ) above:
The load cell includes a plurality of the base bodies,
The plurality of bases are arranged at intervals in the longitudinal direction of the frame sides, and the receiving plate is placed so as to straddle each receiving part of the plurality of bases in a bridge shape,
A bed with a load detection function, wherein the strain sensors are respectively attached to the operating parts of the plurality of bases.

(14) In the bed with load detection function of (13 ) above:
A bed with a load detection function, wherein a space is formed between the plurality of bases in the load cell, and a tip of the first or second support shaft is inserted into the space.

(15) In the bed with load detection function of (12 ) above:
The load cell further comprises:
A holding member fixed to the frame side and disposed above the backing plate;
Two or more suspension shafts that are suspended from the holding member and penetrate the support plate up and down with play;
A bed with a load detection function.

(16) In the bed with load detection function of (15 ) above:
A stopper is formed at the lower end of the suspension shaft,
A bed with a load detection function in which a gap is formed between the retainer and the backing plate.

(17) A bed with a load detection function for detecting a change in a load applied to the bed body by a load detector attached to the bed body and detecting a user's state on the bed surface of the bed body. And
The bed main body includes a bed surface forming portion that forms the bed surface, a lower frame that is placed on an installation surface on which the bed main body is to be installed, and the bed surface forming portion is located above the lower frame. An elevating support mechanism that is interposed between the bed surface forming portion and the lower frame so as to be positioned and supports the bed surface forming portion and lifts and lowers the bed surface forming portion with respect to the lower frame. And a configuration having
The lower frame has a plurality of linear frame sides parallel to the length direction of the bed surface,
The lifting support mechanism is
Between the lower frame and the bed surface forming portion, a load from the bed surface forming portion is applied by inclining and extending in opposite directions within a vertical plane parallel to the length direction of the frame side, A plurality of first tilt movable arms and second tilt movable arms respectively;
A first support shaft that is attached to a lower end of the first tiltable movable arm, an axial direction is orthogonal to a length direction of the frame side, and movement in the length direction of the frame side is prevented;
The second inclined movable arm is attached to the lower end of the second inclined movable arm away from the first support shaft in the length direction of the frame side, the axial direction is orthogonal to the frame side length direction, and the frame side length A second support shaft allowed to move in the direction;
A drive mechanism for changing an inclination angle of the first and second inclined movable arms;
Have
The lifting support mechanism is
The bed mechanism is moved up and down by changing the tilt angle of the first and second tilt movable arms with respect to the lower frame by the drive mechanism, and the second support shaft is moved accordingly. Configured to be proximate to the first support shaft;
The load detector is interposed between the frame side and the first support shaft, and between the frame side and the second support shaft, and is generated by a load applied from each of the support shafts. Has a load cell to measure
The load cell has a base and a strain sensor,
The substrate is
A receiving portion for receiving a load from the first or second support shaft;
An operating portion that is integrally continuous with the receiving portion and is deformed and deformed by a load applied to the receiving portion; and an attachment portion that is integrally continuous with the operating portion and is fixed to the frame side.
Have
The strain sensor is attached to the operating portion so as to detect distortion deformation of the operating portion,
further,
An upper plate member disposed above the second support shaft, attached to the frame side, and extending in the frame side length direction;
The second support shaft includes the end portion disposed between the receiving portion of the base and the upper plate, and a large diameter portion formed to have a larger diameter than the end portion,
A bed with a load detection function configured such that a side surface of the large-diameter portion on the end side faces a part of the upper plate member via a gap.

( 18 ) In the bed with a load detection function of any one of (1) and (2 ) above:
A bed with a load detection function, wherein the base body is configured such that a hole portion constituting a Roverval mechanism is provided in the operating portion.

(19) In the bed with load detection function of (18) :
The bed with a load detection function, wherein a hole provided in the operating portion of the base passes through the operating portion in a direction parallel to the frame side length direction.

(20) In the bed with load detection function of (18 ) above:
A bed with a load detection function, wherein a hole provided in an operating portion of the base passes through the operating portion in a direction orthogonal to the frame side length direction.

(21) In the bed with load detection function of (20 ) above:
The load cell further comprises:
It is configured to have a pedestal member attached to the frame side,
A bed with a load detection function, wherein an attachment portion of the base is attached to an upper surface of the pedestal member.

(22) In the bed with load detection function of (21) :
The load cell further comprises:
A receiver placed on the receiving portion of the base so that the end of the first or second support shaft contacts and receives the load of the support shaft and transmits the load from the support shaft to the receiving portion. A bed with a load detection function, which has a member.

(23) In the bed with load detection function of (22 ) above:
A pair of blocking portions positioned on both sides in the frame side length direction with respect to the end portion of the first support shaft to block the movement of the first support shaft in the frame side length direction; A blocking member is attached to the frame side;
A bed with a load detection function configured such that the blocking member does not come into contact with a member of a load transmission path from the first support shaft to the base, and a receiving part and an operating part of the base.

(24) In the bed with load detection function of (22 ) above:
Located on both sides of the allowable movable range in the frame side length direction with respect to the end portion of the second support shaft, the second support shaft falls off beyond the allowable movable range in the frame side length direction. A drop-off prevention member having a pair of drop-off prevention parts for preventing the attachment is attached to the frame side,
A bed with a load detection function configured such that the drop-off prevention member does not contact a member of a transmission path of a load from the second support shaft to the base, and a receiving part and an operating part of the base.

  According to the bed with a load detection function of the present invention, it is possible to add a load detection function with a simple structure while suppressing an increase in the number of parts, and at the same time, with high accuracy while ensuring the durability of the load detector. It is possible to provide a bed with a load detection function that makes it possible to detect the load and a load detector that can be separately incorporated into the bed body in order to add such a load detection function to an existing bed. is there.

Furthermore, in the present invention, for example, a user on the bed sits or sits at the end of the bed surface of the bed, or a user who is sleeping on the bed surface largely turns over to the end side of the bed surface. Even when the load applied to the bed surface is greatly biased (becomes an unbalanced load) due to hitting, etc., the bed detection accuracy should be detected in the vertical direction that should be detected. The load can be detected with high accuracy without lowering.

It is a side view which shows an example of the bed with a load detection function to which this invention is applied. It is a top view which shows an example of the raising / lowering support mechanism used for the bed shown by FIG. It is a longitudinal cross-sectional view in the III-III line of FIG. It is a longitudinal cross-sectional view in the IV-IV line of FIG. It is a schematic diagram from the same direction as FIG. 4 for demonstrating the raising / lowering operation | movement by the said raising / lowering support mechanism. It is a schematic diagram from the same direction as FIG. 4 for demonstrating the inclination operation | movement by the said raising / lowering support mechanism. It is a perspective view which shows the relationship between four inclination movable arms and the lower frame of the raising / lowering support mechanism in the bed with a load detection function of this invention. It is a perspective view which shows the 1st example of the load cell used for the bed with a load detection function of this invention. It is the side view which looked at the base | substrate shown by FIG. 8 from the arrow IX direction in FIG. It is a longitudinal cross-sectional view in the XX line in FIG. It is a longitudinal cross-sectional view which shows the state which attaches the load cell of the 1st example shown by FIGS. 8-10 to the frame side of a lower frame, and is supporting the support shaft in the position of the XI-XI line of FIG. . It is a schematic diagram for demonstrating the change state of the base | substrate of a load cell when the load cell of the 1st example shown by FIGS. 8-10 receives load. It is a circuit diagram which shows the Wheatstone bridge circuit used for the distortion sensor in the load cell shown by FIGS. It is a perspective view which shows an example of the load cell used on the side which does not permit the movement of the support shaft to a frame side length direction, and a blocking member. It is a side view from the arrow XIV direction of FIG. 13 of the load cell and blocking member shown by FIG. FIG. 14 is a longitudinal cross-sectional view showing a state in which the load cell and the blocking member of the first example shown in FIGS. 13 and 14 are attached to the frame side of the lower frame to support the support shaft at the position of the XV-XV line in FIG. FIG. It is a perspective view which shows the 2nd example of the load cell used for the bed with a load detection function of this invention. It is the side view which looked at the base | substrate shown by FIG. 16 from the arrow XVII direction in FIG. It is a longitudinal cross-sectional view in the XVIII-XVIII line in FIG. FIG. 19 is a longitudinal sectional view showing a state in which the load cell of the second example shown in FIGS. 16 to 18 is attached to the frame side of the lower frame to support the support shaft at the position of line XIX-XIX in FIG. 17. . It is a perspective view which shows the 3rd example of the load cell used for the bed with a load detection function of this invention. It is the side view which looked at the base | substrate shown by FIG. 20 from the arrow XXI direction in FIG. It is a longitudinal cross-sectional view in the XXII-XXII line | wire in FIG. FIG. 23 is a longitudinal sectional view showing a state in which the load cell of the third example shown in FIGS. 20 to 22 is attached to the frame side of the lower frame to support the support shaft at the position of line XXIII-XXIII in FIG. 21. . It is a perspective view which shows the 4th example of the load cell used for the bed with a load detection function of this invention. It is the side view which looked at the base | substrate shown by FIG. 24 from the arrow XXV direction in FIG. FIG. 26 is a longitudinal sectional view taken along line XXVI-XXVI in FIG. 25. FIG. 27 is a longitudinal sectional view showing a state in which the load cell of the fourth example shown in FIGS. 24 to 26 is attached to the frame side of the lower frame to support the support shaft at the position of the line XXVII-XXVII in FIG. 25. . It is a perspective view which shows the 5th example of the load cell used for the bed with a load detection function of this invention. It is the side view which looked at the base | substrate shown by FIG. 28 from the arrow XXIX direction in FIG. FIG. 30 is a longitudinal sectional view taken along line XXX-XXX in FIG. 29. It is a perspective view which shows the 6th example of the load cell used for the bed with a load detection function of this invention. FIG. 32 is a side view of the substrate shown in FIG. 31 as viewed from the direction of arrow XXXII in FIG. 31. It is a longitudinal cross-sectional view in the XXXIII-XXXIII line in FIG. It is a longitudinal cross-sectional view which shows the state which attaches the load cell of the 6th example shown by FIGS. 31-33 to the frame side of a lower frame, and is supporting the support shaft in the position of the XXXIV-XXXIV line | wire of FIG. . It is a perspective view which shows the base | substrate of the 7th example load cell used for the bed with a load detection function of this invention. It is a perspective view which shows the load cell of the 7th example used for the bed with a load detection function of this invention. It is the side view which looked at the load cell of the 7th example from the XXXVII direction in FIG. It is the side view which looked at the load cell of the 7th example from the XXXVIII direction in FIG. It is a perspective view which shows an example of the 7th example load cell and blocking member used for the side which does not permit the movement of the support shaft to a frame side length direction. It is a side view from the arrow XL direction of FIG. 39 of the load cell and blocking member of the 7th example used for the side which does not permit the movement of the support shaft to a frame side length direction. It is a schematic diagram for demonstrating the change state of the base | substrate of a load cell when the load cell of a 7th example receives a load. It is a perspective view which shows the base | substrate group of the load cell of the 8th example used for the bed with a load detection function of this invention. It is a perspective view which shows the load cell of the 8th example used for the bed with a load detection function of this invention. It is the side view which looked at the load cell of the 8th example from the XLIV direction in FIG. It is the side view which looked at the load cell of the 8th example from the XLV direction in FIG. It is a perspective view which shows an example of the 8th example load cell used for the side which does not accept | permit the movement of the support shaft to a frame side length direction. It is a perspective view which shows the base | substrate of the 9th example load cell used for the bed with a load detection function of this invention. It is a perspective view which shows the load cell of the 9th example used for the bed with a load detection function of this invention. It is the side view which looked at the load cell of the 9th example from the XLIX direction in FIG. It is the side view which looked at the load cell of the 9th example from the L direction in FIG. It is a perspective view which shows an example of the 9th example load cell and blocking member used for the side which does not permit the movement of the support shaft to a frame side length direction. It is a side view which shows the load cell of the 10th example used for the bed with a load detection function of this invention. It is a perspective view which shows an example of the 10th example load cell and blocking member used on the side which does not permit the movement of the support shaft to a frame side length direction. It is a perspective view which shows the load cell of the 11th example used for the bed with a load detection function of this invention. It is the side view which looked at the load cell of the 11th example from the LV direction in FIG. It is a perspective view which shows the other example of the bed with a load detection function to which this invention is applied.

  Hereinafter, the configuration of a bed with a load detection function and a load detector to which the present invention is applied will be described with reference to the drawings. In addition, in the drawings used in the following description, in order to make the features easy to understand, there are cases where the portions that become the features are enlarged for convenience, and the dimensional ratios of the respective components are not always the same as the actual ones. . In addition, the materials, dimensions, and the like exemplified in the following description are examples, and the present invention is not limited to them, and can be appropriately changed and implemented without changing the gist thereof.

[Bed configuration]
FIG. 1 is a side view showing an example of a bed 1 with a load detection function to which the present invention is applied, that is, an example of a bed 1 incorporating a bed load detector 50.
The bed 1 with a load detection function includes a bed main body 1A installed on an installation surface B such as a floor surface, for example, and a load change applied to the bed main body 1A by the load detector 50 attached to the bed main body 1A. And a function of detecting the state of the user H on the bed surface T of the bed main body 1A.

  In the following description, the installation surface B and the bed surface T of the bed main body 1A shown in FIG. 1 are horizontal surfaces (surfaces orthogonal to the direction of gravity), and the user H is placed on the bed surface T of the bed main body 1A. Is sleeping in a supine posture, the head side of the user H is “the front side of the bed body 1A”, the foot side of the user H is “the rear side of the bed body 1A”, and the right side of the user H is “the bed” The right side of the main body 1A ”and the left side of the user H are referred to as“ the left side of the bed main body 1A ”. In this specification, the front-rear direction (the left-right direction in FIG. 1) of the bed main body 1A, that is, the direction connecting the head side and the foot side of the user H is referred to as the length direction (longitudinal direction) of the bed main body. .

  The bed main body 1A includes a bed surface forming unit 100 that forms a bed surface T, a lower frame 5 that is positioned on the installation surface B on which the bed main body 1A is to be installed, and the bed surface forming unit 100 above the lower frame 5. Is located between the bed surface forming part 100 and the lower frame 5 so as to support the bed surface forming part 100 and lift and lower the bed surface forming part 100 with respect to the lower frame 5 And a support mechanism 6.

  Here, in the example illustrated in FIG. 1, the bed surface forming unit 100 includes the bed 2 and the upper frame 3 that supports the bed 2. Further, the lower frame 5 is provided with leg portions 4 that are in contact with the installation surface B.

  The bed 2 is a rectangular flat plate having a length and width sufficient for the user H to sleep.

  The bed main body 1 </ b> A allows a user H to be present on the bed 2 in a state where, for example, a mat or a mattress is laid. In addition, in FIG. 1, the state where the user H laid directly on the upper surface (bed surface T) of the bed 2 is shown.

  The upper frame 3 includes a pair of left and right, for example, square pipe-shaped frame sides 3a extending in the length direction of the bed 2 (length direction of the bed body 1A) and the width direction of the bed 2 (of the bed body 1A). A pair of front and rear, for example, rectangular pipe-like parallel frame sides 3b extending in the short direction) are connected in a rectangular frame shape as a whole and extend in the width direction of the bed 2 (short direction of the bed main body 1A). For example, in a state where a plurality of square pipe-shaped frame sides 3c are arranged in the length direction of the bed 2 (longitudinal direction of the bed main body 1A), both ends of the frame sides 3c are connected to a pair of left and right frame sides 3a, respectively. It has a structured (frame structure).

  And the bed 2 is attached in the state fixed on the some frame side 3c. Further, a head plate 7a and a foot plate 7b are attached to the pair of front and rear frame sides 3b constituting the upper frame 3 in a state of being vertically erected.

  The leg portions 4 are respectively disposed at four corners (front left side, front right side, rear left side, rear right side) of the bed main body 1A that are in a symmetrical positional relationship. Each leg 4 is provided with a caster mechanism 8 for facilitating movement of the bed body 1A, which is a heavy object. The configuration of the caster mechanism 8 is not particularly limited, and a conventionally known one can be used. Moreover, depending on the case, it is allowed that the leg part 4 does not have a caster mechanism.

  The lower frame 5 includes a pair of left and right square pipe-shaped frame sides 5a extending in the length direction of the bed main body 1A and a pair of front and rear frames, for example, square pipe-shaped frame sides 5b extending in the short direction of the bed main body 1A. As a whole, it has a structure (frame structure) connected in a rectangular frame shape. And the leg part 4 (caster mechanism 8) is provided in the both ends of the left-right paired frame edge 5a which comprises the lower frame 5, respectively.

  The raising / lowering support mechanism 6 supports the bed surface forming unit 100 including the upper frame 3 as described above, and moves the bed surface forming unit 100 up and down with respect to the lower frame 5. In the present embodiment, the elevating support mechanism 6 is positioned between the lower frame 5 and the upper frame 3 so that the upper frame 3 can be raised and lowered with respect to the lower frame 5 and in the front-rear direction of the bed main body 1A. The upper frame 3 can be inclined with respect to the horizontal plane (that is, the front side or the rear side of the bed surface forming portion 100 including the upper frame 3 can be raised upward).

[Specific Configuration of Main Part of Elevating Support Mechanism 6]
A specific configuration of the elevating support mechanism 6 in the present embodiment will be described in detail with reference to FIGS. FIG. 2 shows a situation in which the upper frame 3 and the lower frame 5 and the lifting support mechanism 6 therebetween are viewed in plan view from above. In order to avoid the complexity of the drawing, the frame side of the upper frame 3 is shown. 3c (see FIG. 1) is omitted. 3 is a longitudinal sectional view taken along the line III-III in FIG. 2, and FIG. 4 is a longitudinal sectional view taken along the line IV-IV in FIG. 2, in which the upper frame 3 is raised with respect to the lower frame 5. It is shown by.

  The elevating support mechanism 6 basically has a position on the horizontal plane including the lower frame 5 or a position in the vicinity thereof (example shown in the drawing) in a vertical plane parallel to the frame side 5a along the length direction of the lower frame 5. Then, two pairs (four in total) of inclined movable arms 61Aa, 61Ab; 61Ba, 61Bb extending obliquely upward from a horizontal plane position slightly lower than the lower frame 5 and the left and right frame sides of the lower frame 5 Two horizontal support shafts 62A, 62B for supporting the lower end portions of the inclined movable arms 61Aa, 61Ab; 61Ba, 61Bb, arranged along a horizontal plane perpendicular to the frame side 5a between 5a; Inclining movable arms 61Aa, 61Ab; first and second drive mechanisms 63A, 63B for changing the inclination angle of 61Ba, 61Bb.

The elevating support mechanism 6 raises and lowers the upper frame 3 by changing the inclination angles of the tilt movable arms 61Aa, 61Ab; 61Ba, 61Bb around the axes of the support shafts 62A, 62B by the drive mechanisms 63A, 63B. Along with this, among the two pairs of tilting movable arms 61Aa, 61Ab; 61Ba, 61Bb, the position of the support shaft 62B that supports the lower ends of the pair of tilting movable arms 61Ba, 61Bb is set in the length direction of the frame side 5a. It is configured to move.

  Here, the pair of left and right tilt movable arms 61Aa and 61Ab are not only connected at their lower ends by a support shaft 62A, but also at intermediate portions in the length direction by a first intermediate connection shaft 65A. Further, the portion near the upper end is connected by the first upper connecting shaft 66A. By such a connection structure, the tilting movable arms 61Aa and 61Ab, the support shaft 62A, the intermediate connection shaft 65A, and the upper connection shaft 66A constitute a frame that forms a rectangular shape as a whole when viewed from the front or rear of the bed body 1A. doing.

  The pair of left and right tilt movable arms 61Ba and 61Bb are not only connected at their lower ends by the support shaft 62B, but also at their intermediate portions in the length direction by the second intermediate connection shaft 65B. Portions near the upper end are connected by the second upper connecting shaft 66B. With such a connection structure, the tilting movable arms 61Ba and 61Bb, the support shaft 62B, the intermediate connection shaft 65B, and the upper connection shaft 66B also constitute a frame that forms a rectangular shape as a whole when viewed from the front or rear of the bed main body 1A. doing.

  Detailed configurations related to the support shafts 62A and 62B, the first and second intermediate connection shafts 65A and 65B, and the first and second upper connection shafts 66A and 66B will be described later.

  Of the two horizontal support shafts 62A, 62B, one support shaft 62A is located on the front side of the bed main body 1A (of the user H) from the center in the length direction (front-back direction of the bed main body 1A) on the frame side 5a. It is arranged between the left and right frame sides 5a at a position close to the head side) along the direction orthogonal to the length direction of the frame sides 5a and horizontally, and both ends of the support shaft 62A. The lower end portions of the pair of tilting movable arms 61Aa and 61Ab are fixed at positions near both end portions 62Aa and 62Ab between 62Aa and 62Ab. Accordingly, the pair of tilting movable arms 61Aa and 61Ab are positioned closer to the front side (the head side of the user H) of the bed main body 1A than the center in the length direction (front and rear direction of the bed main body 1A) of the frame side 5a. Therefore, they are arranged symmetrically. And these inclination movable arms 61Aa and 61Ab incline so that the upper part may be located back (back side of bed main part 1A) rather than the lower part in the vertical plane. A rising inclination angle from the horizontal plane (a plane parallel to the lower frame 5) in the tilt movable arms 61Aa and 61Ab is defined as θA.

  Further, the support shaft 62B has a frame side 5a at a position closer to the rear side (the user H's foot side) of the bed main body 1A than the center of the frame side 5a in the length direction (front and rear direction of the bed main body 1A). The both end portions 62Ba between the both end portions 62Ba and 62Bb of the support shaft 62B are disposed between the left and right frame sides 5a so as to be along the horizontal direction and to be horizontal. At a position near 62Bb, the lower ends of the pair of tilting movable arms 61Ba and 61Bb are fixed. Therefore, the pair of tilting movable arms 61Ba and 61Bb are closer to the rear side of the bed main body 1A (the foot side of the user H) than the center in the length direction (front and rear direction of the bed main body 1A) of the frame side 5a. The inclined movable arms 61Ba and 61Bb are inclined so that the upper part is positioned forward (front side of the bed main body 1A) from the lower part in the vertical plane. The rising inclination angle from the horizontal plane (a plane parallel to the lower frame 5) in the inclined movable arms 61Ba and 61Bb is defined as θB.

  In the following description, of the two pairs of tilting movable arms 61Aa, 61Ab; 61Ba, 61Bb, the pair of tilting movable arms 61Aa, 61Ab located near the front side of the bed main body 1A and the position near the rear side of the bed main body 1A. When a pair of tilt movable arms 61Ba and 61Bb are described separately, the front tilt movable arms 61Aa and 61Ab are referred to as first tilt movable arms, and the rear tilt movable arms 61Ba and 61Bb are first. It will be referred to as 1 tilting movable arm. Similarly, when it is necessary to distinguish between the two support shafts 62A and 62B, among these support shafts, the front support shaft 62A is the first support shaft, and the rear support shaft 62B is the second support shaft 62B. This will be referred to as a support shaft.

  Further, both end portions 62Aa and 62Ab of the support shafts 62A and 62B; It is desirable to have a configuration in which rolling elements 41 are provided that can freely rotate relative to the support shafts 62A and 62B around the center axis (rotation axis) of the support shafts 62A and 62B. In this case, it is desirable that each rolling element 41 has an outer peripheral surface that is a cylindrical surface with reference to the central axis of each of the support shafts 62A and 62B.

  As described in detail later, between both end portions 62Aa, 62Ab; 62Ba, 62Bb (rolling elements 41) of the support shafts 62A, 62B in the lifting support mechanism 6 as described above, Load cells 51A and 51B of the load detector 50 are respectively interposed.

  Here, of the first and second support shafts 62A and 62B, the first support shaft 62A that supports the pair of first tilt movable arms 61Aa and 61Ab located closer to the front side of the bed body 1A will be described later. The blocking member 54 (see FIGS. 13 to 15) restricts the position (position in the length direction of the frame side 5a) from substantially moving and rotates about the axis with respect to the frame side 5a. It is possible. That is, the first support shaft 62A located closer to the front side of the bed body 1A is supported rotatably about the shaft center by the load cell 51A interposed between both end portions 62Aa and 62Ab (rolling elements 41) and the frame side 5a. At the same time, the blocking member 54 prevents the position of the frame side 5a from changing in the length direction.

  On the other hand, the second support shaft 62B that supports the lower ends of the pair of second inclined movable arms 61Ba and 61Bb located near the rear side of the bed main body 1A has a position (position in the length direction on the frame side 5a). It can move linearly in the length direction of the frame side 5a and can rotate about the axis with respect to the frame side 5a. That is, the second support shaft 62B located near the rear side of the bed main body 1A has a length in the frame side 5a by the load cell 51B interposed between the both end portions 62Ba and 62Bb (rolling elements 41) and the frame side 5a. It is supported so as to be rotatable about the axis while being movable in the direction.

[Specific configuration of other parts of lifting support mechanism]
Furthermore, the other structural member in the raising / lowering support mechanism 6 of this embodiment is demonstrated.

  The intermediate portions in the length direction (inclination direction) of the pair of left and right first inclined movable arms 61Aa and 61Ab located closer to the front of the bed main body 1A are connected by the first intermediate connecting shaft 65A as described above. Yes. One end (lower end) of a pair of left and right upper tilt arms 64Aa and 64Ab is rotatably connected to the first intermediate connecting shaft 65A. Therefore, the upper tilting arms 64Aa and 64Ab can tilt with respect to the first tilting movable arms 61Aa and 61Ab.

The other ends (upper ends) of the pair of left and right upper tilt arms 64Aa and 64Ab are rotatably connected to the frame side 3a of the upper frame 3 via the first upper frame intermediate bar 67A. That is, the first upper frame intermediate bar 67A is connected to the front position of the left and right frame sides 3a of the upper frame 3 so as to connect the left and right frame sides 3a (thus orthogonal to the front-rear direction of the bed main body 1A). And upper ends of the upper tilt arms 64Aa and 64Ab are attached to the first upper frame intermediate bar 67A so as to be rotatable about the axis of the first upper frame intermediate bar 67A.
Here, the upper tilting arm 64 </ b> A on the front side of the bed main body 1 </ b> A is tilted so that the upper end is directed to the front side rather than the lower end.

  The intermediate portions in the length direction (inclination direction) of the pair of left and right second inclined movable arms 61Ba and 61Bb located closer to the rear of the bed main body 1A are coupled by the second intermediate coupling shaft 65B as described above. Yes. One end (lower end) of the pair of left and right upper tilt arms 64Ba and 64Bb is rotatably connected to the second intermediate connecting shaft 65B. Therefore, the upper tilting arms 64Ba and 64Bb can tilt with respect to the second tilting movable arms 61Ba and 61Bb.

The other ends (upper ends) of the pair of left and right upper tilt arms 64Ba and 64Bb are rotatably connected to the frame side 3a of the upper frame 3 via the second upper frame intermediate bar 67B. That is, the second upper frame intermediate bar 67B connects the left and right frame sides 3a at positions closer to the rear of the left and right frame sides 3a of the upper frame 3 (thus orthogonal to the front-rear direction of the bed main body 1A). The upper upper arms of the upper tilt arms 64Ba and 64Bb are attached to the second upper frame intermediate bar 67B so as to be rotatable about the axis of the second upper frame intermediate bar 67B.
Here, the upper tilting arm 64B closer to the rear of the bed main body 1A is tilted so that the upper end is directed to the rear side rather than the lower end.

  Further, the front frame and the rear frame positions on the left and right frame sides 3a of the upper frame 3 (however, the positions between the first upper frame intermediate bar 67A and the second upper frame intermediate bar 67B described above) 3 upper frame middle bars 68A and fourth upper frame middle bars 68B are fixedly provided so as to connect the left and right frame sides 3a (thus orthogonal to the front-rear direction of the bed main body 1A). . A slide guide shaft 69 is fixedly spanned between the third upper frame intermediate bar 68A and the fourth upper frame intermediate bar 68B. The slide guide shaft 69 has an axial direction (length direction) along the front-rear direction of the bed main body 1A. The first and second slide members 70A and 70B are slidably attached to the slide guide shaft 69 along the axial direction (that is, along the front-rear direction of the bed main body 1A) independently of each other. .

  The first upper connecting shaft 66A that connects the portions near the upper ends of the pair of left and right first inclined movable arms 61Aa and 61Ab closer to the front in the bed main body 1A is connected to the first slide member 70A. It is connected via a dynamic connecting bar 71A. Specifically, one end (lower end) of the first swing connecting bar 71A is rotatably attached to the first upper connecting shaft 66A, and the other end (upper end) is rotatable to the first slide member 70A. It is connected to. Therefore, the first tilting movable arms 61Aa and 61Ab can swing with respect to the first slide member 70A.

  On the other hand, a second upper connecting shaft 66B that connects portions near the upper ends of the pair of left and right second inclined movable arms 61Ba, 61Bb closer to the rear in the bed main body 1A is connected to the second slide member 70B. Are connected via a swing connecting bar 71B. Specifically, one end (lower end) of the second swing connecting bar 71B is rotatably attached to the second upper connecting shaft 66B, and the other end (upper end) is rotatable to the second slide member 70B. It is connected to. Therefore, the second tilting movable arms 61Ba and 61Bb can swing with respect to the second slide member 70B.

  Further, the fourth upper frame intermediate bar 68B located near the back of the bed body 1A has a first drive mechanism 63A for tilting the first tilting movable arms 61Aa and 61Ab near the front of the bed body 1A. A first advancing / retracting actuator 63Ab for linearly advancing / retreating the first advancing / retreating drive shaft 63Aa is attached to be tiltable via a first actuator swinging support member 72A. That is, the first actuator swing support member 72A is suspended downward from the fourth upper frame intermediate bar 68B, and the first advance / retreat actuator 63Ab is rotatable at the lower end of the first actuator swing support member 72A. Is attached.

  The first advance / retreat drive shaft 63Aa of the first advance / retreat actuator 63Ab extends forward of the bed main body 1A, and the tip of the first advance / retreat drive shaft 63Aa passes through the first drive connection bar 73A. Connected to the first slide member 70A. That is, the first drive connection bar 73A is suspended downward from the first slide member 70A so that the lower end of the first drive connection bar 73A is near the upper ends of the first tilt movable arms 61Aa and 61Ab. The first upper connecting shaft 66A that connects the portions is rotatably connected.

  On the other hand, on the third upper frame intermediate bar 68A located near the front of the bed body 1A, the second drive mechanism 63B for tilting the second tilting movable arms 61Ba and 61Bb near the rear of the bed body 1A. As shown, a second advancing / retracting actuator 63Bb for linearly advancing / retreating the second advancing / retreating drive shaft 63Ba is attached so as to be tiltable via a second actuator swinging support member 72B. That is, the second actuator swinging support member 72B is suspended downward from the third upper frame intermediate bar 68A, and the second advance / retreat actuator 63Bb is rotatable at the lower end of the second actuator swinging support member 72B. Is attached.

  Then, the second forward / backward drive shaft 63Ba of the second forward / backward actuator 63Bb extends rearward of the bed body 1A, and the tip of the second forward / backward drive shaft 63Ba passes through the second drive connecting bar 73B. Are connected to the second slide member 70B. That is, the second drive connection bar 73B is suspended downward from the second slide member 70B so that the lower end of the second drive connection bar 73B is close to the upper ends of the second inclined movable arms 61Ba and 61Bb. It is rotatably connected to a second upper connecting shaft 66B that connects the parts.

  Here, the specific configurations of the first forward / backward actuator 63Ab and the second forward / backward actuator 63Bb are not particularly limited, and a hydraulic cylinder or a linear motor that directly causes linear motion, or a normal rotary electric motor. Arbitrary things such as a combination of a rotation / linear conversion mechanism and a motor can be used.

[Elevating operation by elevating support mechanism]
The operation of the elevating support mechanism 6 in the present embodiment as described above will be described next with reference mainly to FIGS. FIG. 5 is a schematic diagram when the upper frame 3 is raised and lowered with respect to the longitudinal section at substantially the same position as FIG. FIG. 6 is a schematic view when the upper frame 3 is inclined with respect to the same longitudinal section.

First, the case where the upper frame 3 is moved up and down while the upper frame 3 of the bed surface forming unit 100 is kept horizontal will be described with reference to FIG.
When the upper frame 3 is raised from the state where the upper frame 3 is in the lowered position as shown by the solid line in FIG. 5, the first advance / retreat actuator 63Ab of the first drive mechanism 63A is operated to At the same time as the advance / retreat drive shaft 63Aa is advanced, the second advance / retreat actuator 63Bb of the second drive mechanism 63B is operated to advance the second advance / retreat drive shaft 63Ba. At this time, it is desirable that the advance speed and advance distance of the first advance / retreat drive shaft 63Aa and the second advance / retreat drive shaft 63Ba are constant speed and equal distance.

  With the advancement of the first advance / retreat drive shaft 63Aa, the upper end of the first inclined movable arm 61Aa (61Ab) closer to the front of the bed main body 1A via the first drive connection bar 73A and the first upper connection shaft 66A. The first tilting movable arm 61Aa (in the direction in which the tilt angle (opening angle) θA of the first tilting movable arm 61Aa (61Ab) with respect to the lower frame 5 is increased by pushing the side toward the front of the bed main body 1A. 61Ab) tilts.

  Here, the intermediate portion of the first tilting movable arm 61Aa (61Ab) is connected to the upper frame 3 via the first intermediate connecting shaft 65A, the upper tilting arm 64Aa (64Ab), and the first upper frame intermediate bar 67A. Since the upper frame intermediate bar 67A is connected to the frame side 3a and is fixed to the frame side 3a, the first inclined movable arm 61Aa (61Ab) in the direction in which the opening angle θA increases as described above. The upper tilting arm 64Aa (64Ab) pushes up the upper frame 3 by tilting.

  At the same time, as the second advance / retreat drive shaft 63Ba advances, the second inclined movable arm 61Ba (61Bb) closer to the rear of the bed body 1A passes through the second drive connection bar 73B and the second upper connection shaft 66B. When the upper end side is pushed toward the rear of the bed body 1A, the second tilt movable arm 61Ba is increased in the direction in which the tilt angle (opening angle) θB of the second tilt movable arm 61Ba (61Bb) with respect to the lower frame 5 is increased. (61Bb) tilts.

  Here, the intermediate portion of the second tilting movable arm 61Ba (61Bb) is connected to the upper frame 3 via the second intermediate connecting shaft 65B, the upper tilting arm 64Ba (64Bb), and the second upper frame intermediate bar 67B. Since the upper frame intermediate bar 67B is connected to the frame side 3a and is fixed to the frame side 3a, the second inclined movable arm 61Ba (61Bb) in the direction in which the opening angle θB is increased as described above. The upper tilt arm 64Ba (64Bb) pushes up the upper frame 3 by tilting.

  Here, a portion near the upper end of the tilting movable arm 61Aa (61Ab); 61Ba (61Bb) is provided via the first and second upper connecting shafts 66A and 66B and the first and second swinging connecting bars 71A and 71B. Since the first and second slide members 70A and 70B are connected to the first and second slide members 70A and 70B, respectively, the first and second slide members 70A and 70B are linearly moved in directions away from each other while being guided by the slide guide shaft 69. To do. Since both ends of the slide guide shaft 69 are fixed to the upper frame 3 via the third and fourth upper frame intermediate bars 68A and 68B so as to be parallel to the frame side 3a of the upper frame 3, the first guide The second slide members 70A and 70B move while being guided in a direction parallel to the frame side 3a of the upper frame 3. The slide members 70A and 70B are respectively connected to the movable movable arms 61Aa (61Ab) and 61Ba (61Bb) via the first and second drive connection bars 73A and 73B and the first and second upper connection shafts 66A and 66B. Are connected to the portion near the upper end of each of the tilt movable arms 61Aa (61Ab); 61Ba (61Bb) when the tilt movable arms 61Aa (61Ab); 61Ba (61Bb) near the upper end (upper connection) The movement trajectory of the shafts 66A and 66B) is along the length direction of the slide guide shaft 69, that is, the length direction of the frame side 3a of the upper frame 3. As a result, the upper frame 3 rises while maintaining a horizontal posture.

  Here, the first support shaft 62A that supports the lower end portion of the first inclined movable arm 61Aa (61Ab) that depends on the front side of the bed main body 1A is connected to the frame side 5a of the lower frame 5 through the load cell 51A. Although it can rotate, its position (position in the length direction of the frame side 5a) is fixed. On the other hand, the second support shaft 62B that supports the lower end portion of the second inclined movable arm 61Ba (61Bb) that is rearward of the bed main body 1A rotates with respect to the frame side 5a of the lower frame 5 via the load cell 51B. It is movable and is movable in the length direction of the frame side 5a. For this reason, for example, the advance speeds of the front and rear drive shafts 63Aa and 63Ba are not completely the same, the start timing of the advance is slightly shifted, and further, the dimension of each movable member in the elevating support mechanism 6 is processed. Even if there is a slight error in the above, the second support shaft 62B that supports the lower end portions of the second inclined movable arms 61Ba and 61Bb that are rearward of the bed main body 1A slightly moves in the front-rear direction. Therefore, the upper frame 3 can be smoothly raised while maintaining the horizontal state by absorbing the deviation and error in operation.

[Inclination by the lifting support mechanism]
Next, when the bed surface forming unit 100 is inclined from the horizontal state, that is, the rear side (foot side) of the upper frame 3 is inclined downward relative to the front side (head side), or conversely, that is, the upper side. The operation of the elevating support mechanism 6 when the front side (head side) of the frame 3 is inclined downward relative to the rear side (foot side) will be described with reference to FIG.

  6 shows a state in which the rear side (foot side) of the upper frame 3 is lowered from the state shown by the solid line in FIG. 5 (the state in which the upper frame 3 of the bed surface forming unit 100 is horizontal at the raised position). A state in which the side (foot side) is inclined so as to be lower than the front side (head side) is shown.

  Here, in order to lower the rear side (foot side) of the upper frame 3 as described above, the second advance / retreat actuator 63Bb of the second drive mechanism 63B is operated in the direction opposite to the upward direction, The advance / retreat drive shaft 63Ba is moved backward. Further, the first advance / retreat actuator 63Ab of the first drive mechanism 63A is maintained in the inoperative state.

  Thus, by retracting the second advancing / retracting drive shaft 63Ba, the second inclined movable arm 61Ba (61Bb) closer to the rear of the bed main body 1A via the second drive connecting bar 73B and the second upper connecting shaft 66B. ) Is pulled toward the front of the bed main body 1A, and the second tilting movable arm in a direction in which the tilt angle (opening angle) θB of the second tilting movable arm 61Ba (61Bb) with respect to the lower frame 5 is reduced. 61Ba (61Bb) tilts. The intermediate portion of the second tilting movable arm 61Ba (61Bb) is the frame side of the upper frame 3 via the second intermediate connecting shaft 65B, the upper tilting arm 64Ba (64Bb), and the second upper frame intermediate bar 67B. Since the upper frame intermediate bar 67B is connected to the rear side of the frame side 3a, the second tilting movable arm 61Ba (61Bb) is tilted in the direction in which the opening angle θB is reduced as described above. Thus, the upper tilting arm 64Ba (64Bb) pulls the rear side of the upper frame 3 down.

  The portion near the upper end of the second tilting movable arm 61Ba (61Bb) is connected to the second slide member 70B via the second upper connecting shaft 66B and the second swing connecting bar 71B. The second slide member 70B moves linearly in front of the bed body in parallel with the frame side 3a of the upper frame 3 while being guided by the slide guide shaft 69. Further, since the first advance / retreat actuator 63Ab near the rear of the bed main body is kept in an inoperative state, the first advance / retreat actuator 63Ab toward the front is inclined in the tilting direction with respect to the first tilt movable arm 61Aa (61Ab) near the front. However, as described above, as the rear side of the upper frame 3 is pulled down and tilted by the second advance / retreat actuator 63Bb, the first tilting movable arm 61Aa (61Ab) closer to the front also tilts. Tilt in the direction in which θA decreases.

  As described above, the second advancing / retreating actuator 63Bb of the second drive mechanism 63B is operated in the direction opposite to the ascending direction, and the second advancing / retreating drive shaft 63Ba is moved backward to move the rear of the upper frame 3. By pulling down the side (foot side), the foot side can be inclined downward.

  Depending on the initial state, while the second advance / retreat actuator 63Bb is maintained in the non-actuated state, the first advance / retreat actuator 63Ab is operated in the same direction as when it is raised, and the first advance / retreat drive shaft 63Aa is moved forward. Also by lifting the front side (head side) of the upper frame 3, the foot side can be inclined relative to the head side.

  Contrary to the above, in order to lower the front side (head side) of the upper frame 3, the second drive mechanism 63Bb of the second drive mechanism 63B maintains the non-operating state, and the first drive mechanism 63A. The first advance / retreat actuator 63Ab may be operated in a direction opposite to that when the first advance / retreat actuator 63Ab is moved upward to retract the first advance / retreat drive shaft 63Aa. Although not particularly shown in that case, the upper end side of the first inclined movable arm 61Aa (61Ab) closer to the front of the bed main body 1A is pulled toward the rear of the bed main body 1A, and the first inclination with respect to the lower frame 5 is performed. The first tilting movable arm 61Aa (61Ab) tilts in the direction in which the tilt angle (opening angle) θA of the movable arm 61Aa (61Ab) decreases. By tilting the first tilting movable arm 61Aa (61Ab) in such a direction that the opening angle θA becomes smaller, the upper tilting arm 64Aa (64Ab) pulls down the front side of the upper frame 3, and the front side of the upper frame 3 is rearward. It can be set as the state inclined below from the side.

  Depending on the initial state, the second advance / retreat actuator 63Bb is operated in the same direction as when the second advance / retreat actuator 63Bb is operated while the first advance / retreat actuator 63Ab is kept in an inoperative state, thereby moving the second advance / retreat drive shaft 63Ba forward The head side can also be inclined downward relative to the foot side by lifting the rear side (head side) of the upper frame 3.

  Here, as described above, the first advance / retreat actuator 63Ab for driving the first tilt movable arm 61Aa (61Ab) on the front side and the second tilt movable arm 61Ba (61Bb) on the rear side are driven. When the upper frame 3 is tilted by actuating the other one of the second advance / retreat actuators 63Bb while keeping the other inactive, the first tilt movable arm 61Aa (61Ab) on the front side is moved. The distance between the first support shaft 62A that supports the lower end portion and the second support shaft 62B that supports the lower end portions of the second inclined movable arms 61Ba and 61Bb on the rear side varies. Here, in the present embodiment, the first support shaft 62A on the front side supports the frame side 5a of the lower frame 5 so as not to move in the front-rear direction, while the second support shaft 62B on the rear side. Is supported so as to be movable in the front-rear direction with respect to the frame side 5a of the lower frame 5, so that the second support shaft 62B on the rear side moves in the front-rear direction during the tilting operation so that the tilting operation is smoothly performed. be able to.

[Summary of operation by lifting support mechanism]
As described above, it is possible to adjust the height of the bed 2 by moving the bed 2 of the bed surface forming unit 100 together with the upper frame 3 by using the lifting support mechanism 6 of the present embodiment. In addition, the bed 2 of the bed surface forming unit 100 can be inclined together with the upper frame 3.

[Load detector / Load cell]
A load from the bed 2 is applied to the tilting movable arms 61Aa, 61Ab; 61Ba, 61Bb and the support shafts 62A, 62B at the lower ends of the tilting movable arms 61Aa, 61Ab in the lifting support mechanism 6 as described above. Therefore, in the present embodiment, as shown also in FIG. 7, between both end portions 62 </ b> Aa and 62 </ b> Ab (the rolling elements 41) of the first support shaft 62 </ b> A closer to the front and the frame side 5 a of the lower frame 5, Similarly, a load cell 51A of the load detector 50 is interposed between the both end portions 62Ba and 62Bb (rolling elements 41) of the second support shaft 62B closer to the rear and the frame side 5a of the lower frame 5. The load cell 51B of the container 50 is interposed, and the load cells 51A and 51B are configured to detect the load from the bed 2 at locations near the four corners of the bed main body 1A (four locations in total). In this embodiment, the load cell 51A on the front side and the load cell 51B on the rear side have the same configuration as the configuration of the load cell itself as will be described later. However, for convenience of explanation, different reference numerals (51A, 51B) are used. ) Is attached.

  In addition to the load cells 51A and 51B that detect strain generated when a load is applied, the load detector 50 is output from each of the load cells 51A and 51B as shown in FIG. A load is measured based on the strain signal, and a calculation unit 59A that calculates the state of the user H on the bed surface T of the bed main body 1A from the load signal and a result calculated by the calculation unit 59A are transmitted remotely. A transmission unit 59B and a reception unit 59C that receives a signal transmitted from the transmission unit 59B are provided.

  Note that the load cells 51A and 51B and the calculation unit 59A and the calculation unit 59A and the transmission unit 59B are electrically connected by wires 59a and 59b, respectively. On the other hand, transmission / reception is possible between the transmission unit 59B and the reception unit 59C using radio waves or optical signals.

[Load cell mounting and support shaft support]
Below, each example of the attachment state of load cell 51A, 51B of the load detector 50, and the state in which the load cell supports each support shaft is demonstrated with reference to FIGS.

  Of the two pairs of load cells 51A and 51B in the present embodiment, the pair of load cells 51A closer to the front of the bed body 1A has the lower ends of the pair of first inclined movable arms 61Aa and 61Ab closer to the front of the bed body 1A, respectively. The first support shaft 62A is attached between both end portions 62Aa and 62Ab and the pair of frame sides 5a of the lower frame 5, and receives both end portions 62Aa and 62Ab (rolling elements 41). The support shaft 62A is rotatably supported around the axis. However, the movement of the first support shaft 62A in the length direction of the frame side 5a (the longitudinal direction of the bed main body) is blocked by a blocking member 54 (see, for example, FIGS. 13 to 15) attached to the frame side 5a. I am doing so.

As described above, in the pair of load cells 51A closer to the front of the bed main body 1A, the support shaft 62A can rotate while the movement of the support shaft 62A in the length direction of the frame side 5a (front and rear direction of the bed main body) is prevented. Supported. The pair of load cells 51A is distorted by the load applied from the end portion of the support shaft 62A while transmitting the load from the end portion (the rolling element 41 of the one end portion 62Aa or the other end portion 62Ab) to the frame side 5a. Is detected.

  On the other hand, the pair of load cells 51B near the rear of the bed main body 1A are provided at both ends of the second support shaft 62B to which the lower ends of the pair of second inclined movable arms 61Ba and 61Bb near the rear of the bed main body 1A are attached. It is interposed between 62Ba, 62Bb (rolling element 41) and the pair of frame sides 5a of the lower frame 5. The pair of load cells 51B closer to the rear receive the both end portions 62Ba and 62Bb (rolling elements 41) of the support shaft 62B, respectively, and support the support shaft 62B so as to be rotatable about the axis, and the support shaft 62B. The position of the support shaft 62B is allowed to move in the length direction of the frame side 5a (the longitudinal direction of the bed body). That is, unlike the pair of load cells 51A near the front, the blocking member as described above is not provided near the pair of load cells 51B near the rear.

Therefore, in the pair of load cells 51B closer to the rear, the support shaft 62B rotates around the axis while allowing the position of the support shaft 62B to move in the length direction of the frame side 5a (front-back direction of the bed body). Will be supported as possible. Then, while transmitting a load from the end portion of the second support shaft 62B (the rolling element 41 of the one end portion 62Ba or the other end portion 62Bb) to the frame side 5a, the strain due to the load applied from the end portion is detected.

  As described above, the pair of load cells 51A closer to the front of the bed main body 1A and the pair of load cells 51B closer to the rear support shaft (62A or 62B) in the length direction of the frame side 5a (the front-rear direction of the bed main body). There is a difference in whether to prevent or allow movement. However, even if the same structure is used as the load cell, it is possible to change whether the support shaft is prevented or allowed to move only by changing the engagement state or mounting state of the frame side and each support shaft. Is possible.

  Therefore, in the present embodiment, as a pair of load cells 51A on the side (front side of the bed body) that prevents the movement of the support shaft and a pair of load cells 51B on the side (back side of the bed body) that allows the movement of the support shaft, The structure itself is the same. By using the same load cell structure as described above, it is not necessary to prepare a load cell having a different structure, and the cost can be reduced as compared with the case of using a load cell having a different structure. However, depending on the case, it is allowed to use a load cell having a different structure.

[First example of load cell]
First, a first example of a pair of load cells 51B on the side (back side of the bed main body) that allows movement of the support shaft and the attached state thereof will be described with reference to FIGS.
Note that the pair of left and right load cells 51B and their attachment and support are symmetrical on the left and right sides of the bed body. FIGS. 8 to 11 show the load cells on one side (for example, the left side) of the pair of left and right load cells 51B. Only 51B is shown.

  8 to 10 show a load cell 51B of the first example, and FIG. 11 shows a state in which the load cell 51B is incorporated in the bed body, that is, the load cell 51B is placed on the frame side 5a of the lower frame 5. The state where the load cell 51B is attached and receives (supports) one end portion 62Ba of the support shaft 62B is shown. Here, the frame side 5a of the lower frame 5 is formed in a square pipe shape in which a cross section in a direction orthogonal to the length direction (front and rear direction of the bed main body) forms a rectangular shape, and its side surface 5aa. 5ab is perpendicular to the installation surface B (see FIG. 1).

  In the load cell 51B, a load from the bed surface forming portion 100 side is applied via the one end portion 62Ba (62Bb) of the support shaft 62B, and the substrate 52 is deformed and deformed by the load, and the strain of the substrate 52 is detected. And a strain sensor 57 (see FIGS. 8 and 12B).

  Basically, the base 52 receives the rolling element 41 of the one end portion 62Ba (62Bb) of the support shaft 62B, and a receiving portion 52A to which a load from the support shaft 62B acts, and the receiving portion 52A are integrally continuous. The operation portion 52B is distorted and deformed by a load applied to the receiving portion 52A, and the attachment portion 52C is integrally connected to the operation portion 52B and fixed to the frame side 5a of the lower frame 5 in the bed main body 1A. It is said that. And the distortion sensor 57 is attached to said operation | movement part 52B.

  Here, the base 52 corresponds to a so-called strain body, and in the case of this example, a cantilever type (cantilever type) configuration provided with a robust mechanism is applied.

  Specifically, the receiving portion 52A of the base body 52 is a long plate extending along the length direction of the frame side 5a, and the plate surface is a horizontal portion in a state of being incorporated in the bed main body. The long plate-shaped receiving portion 52A is a portion where a part of the outer peripheral surface of the one end portion 62Ba (62Bb) of the support shaft 62B (the lower portion of the outer peripheral surface of the rolling element 41) is in contact with the upper surface. The rolling element 41 of the support shaft 62B can roll in the length direction of the portion 52A (the length direction of the frame side 5a; the longitudinal direction of the bed body). That is, the receiving portion 52 is a portion that rotatably supports the one end portion 62Ba (62Bb) of the support shaft 62B while allowing movement of the frame side 5a in the length direction.

  From one edge in the width direction of the long plate-shaped receiving portion 52A, a vertical wall portion 52D continuous with the long plate-shaped receiving portion 52A rises, and from the upper portion of the wall portion 52D, On the opposite side to the long plate-shaped receiving portion 52A, a relatively thick long plate-shaped operating portion 52B that extends integrally with the wall portion 52D extends horizontally. This thick long plate-like actuating part 52B is a part corresponding to a so-called cantilever part, and the actuating part 52B has a hole 58 for constituting a Roverval mechanism along the length direction ( Therefore, it is formed so as to penetrate (along the horizontal direction). Further, for example, four strain gauges (strain sensitive resistors) R1, R2, R3, and R4 are attached to the upper surface of the long plate-like operation unit 52B as the strain sensor 57 described above.

  Further, a mounting portion 52C having a vertical wall shape is integrally and continuously formed from the edge in the width direction on the opposite side to the wall portion 52D in the long plate-like operation portion 52B. A plurality of (three in the illustrated example) attachment holes 52Ca penetrating in the horizontal direction are formed in the vertical wall-like attachment portion 52C. These attachment holes 52Ca are for attaching the base body 52 of the load cell 51B to the frame side 5a of the lower frame 5 with, for example, bolts 53 as will be described later.

  Here, the hole 58 formed in the actuating part (cantilever part) 52B is a part for configuring the Roverval mechanism as described above, and the deformation of the actuating part 52B is locally concentrated and deformed. It is formed to make it easier to detect distortion. Although the shape of the hole 58 as the Roverval mechanism is not limited, in the present embodiment, as shown in FIG. 10, in the state of penetrating the long plate-like operating portion 52 </ b> B in the length direction. And a pair of round holes 58a, 58b arranged horizontally along the width direction (the direction extending horizontally) of the operating portion 52B, and a connecting hole 58c connecting between the centers of the pair of round holes 58a, 58b. It is configured.

  For example, four strain gauges (strain-sensitive resistors) R1, R2, R3, R4 as the strain sensor 57 are a pair of round holes 58a, for example, at a central position in the length direction of the upper surface of the long-plate-like operating portion 52B. , 58b are arranged in a line directly in the width direction of the long plate-like actuating portion 52B, respectively, immediately above the positions at which the two are formed.

These four strain gauges R1, R2, R3, and R4 constitute a Wheatstone bridge circuit as shown in FIG. 12B as four resistors, and among these strain gauges, R1 and R3 are strains on the compression side. Gauges R2 and R4 correspond to tensile strain gauges. In this Wheatstone bridge circuit, it is possible to output an output voltage V _OUT (load signal) corresponding to the magnitude of distortion generated in the operating portion 52B with respect to the input voltage V _IN (constant).

  In this embodiment, all of the four resistors constituting the Wheatstone bridge circuit of the strain sensor 57 are strain gauges (strain sensitive resistors). However, the strain sensor 57 includes at least one strain gauge (strain gauge). Any structure may be used as long as it is made of a sensitive resistor. In that case, any one to three strain gauges of the strain gauges R1, R2, R3, and R4 constituting the Wheatstone bridge circuit shown in FIG. 12B can be replaced with dummy resistors that are not strain sensitive. .

  The material of the base 52 of the load cell 51B is not particularly limited, and a resin such as metal or engineering plastic can be used. However, from the viewpoint of strength and rigidity, fatigue resistance, lightness, economy, etc. It is desirable to use aluminum alloys, light alloys such as titanium alloys and magnesium alloys, or metals such as iron, carbon steel, and stainless steel, and in some cases, use resins such as ABS resin and polycarbonate resin. Can do.

  The load cell 51B as described above is attached to a position near the rear of the bed main body on the frame side 5a of the lower frame 5. FIG. 11 shows a state where the load cell 51B is attached to the frame side 5a. Therefore, the installation state of the load cell 51B will be described mainly with reference to FIG.

  In the base 52 of the load cell 51B, the inner surface 52Cb of the mounting portion 52C is an outer surface of the frame side 5a of the lower frame 5 (a side surface corresponding to the outer side of the rectangular lower frame 5, hereinafter referred to as an outer surface). 5aa is in surface contact, and the operating portion 52B is disposed below the lower surface of the frame side 5a (that is, a gap S1 exists between the lower surface of the frame side 5a and the upper surface of the operating portion 52B). ing. The mounting portion 52C is fixed to the frame side 5a by a plurality of bolts 53. A long plate-like receiving portion 52A of the base 52 extends horizontally inside the rectangular lower frame 5 below the frame side 5a.

Therefore, in the load cell 51B of the present example, the base 52 has a frame side 5a in a direction from one end side (side continuous to the receiving portion 52A) of the operating portion 52 to the other end side (side continuous to the mounting portion 52C). It is along the direction orthogonal to the length direction. In other words, the base body 52 is arranged in such a direction that the hole 58 for constituting the Roverval mechanism penetrates in a direction parallel to the length direction of the frame side 5a.

The one end portion 62Ba (rolling element 41) of the support shaft 62B for connecting the tilting movable arm 61Ba (61Bb) is placed on the horizontal upper surface of the receiving portion 52A.

  On the other hand, FIG. 13 to FIG. 15 show an example of a pair of load cells 51A on the side that prevents the movement of the support shaft (near the front of the bed main body) and the mounting state thereof. The load cell 51A also basically includes the receiving portion 52A, the operating portion 52B, and the attachment portion 52C in the same manner as the pair of load cells 51B on the side (rear side of the bed main body) that allows the movement of the second support shaft 62B. The substrate 52 has a structure and a strain sensor 57 attached to the operating portion 52B. The specific configurations of the base body 52 and the strain sensor 57 in the load cell 51A may be the same as those of the load cell 51B described above, and therefore the details thereof are omitted here.

  The load cell 51 </ b> A is incorporated at a position near the front of the bed body in the frame side 5 a of the lower frame 5. That is, in the base 52 of the load cell 51A, the inner side surface 52Cb of the mounting portion 52C is referred to as an outer surface (a side surface corresponding to the outer side of the rectangular lower frame 5; hereinafter referred to as an outer surface). ) Arranged so that the surface is in contact with 5aa and the operating portion 52B is positioned below the lower surface of the frame side 5a (that is, there is a gap S1 between the lower surface of the frame side 5a and the upper surface of the operating portion 52B). Has been. And the attaching part 52C is being fixed to the frame side 5a with the some volt | bolt. Further, a long plate-like receiving portion 52A of the base 52 extends horizontally inside the rectangular lower frame 5 below the frame side 5a.

Therefore, in the load cell 51A of this example, the base 52 has a frame side 5a in a direction from one end side (side continuous to the receiving portion 52A) of the operating portion 52 to the other end side (side continuous to the mounting portion 52C). It is along the direction orthogonal to the length direction. In other words, the base body 52 is arranged in such a direction that the hole 58 for constituting the Roverval mechanism penetrates in a direction parallel to the length direction of the frame side 5a.

  Here, a blocking member 54 for blocking the movement of the first support shaft 62A in the length direction of the frame side 5a is attached to the upper surface side of the pair of load cells 51A near the front of the bed main body on the frame side 5a. It has been. The blocking member 54 is, for example, equivalent to (or more than) the outer diameter of the one end portion 62Aa (the rolling element 41) of the longitudinal support shaft 62A of the frame side 5a above the receiving portion 52A of the base 52 of the load cell 51A. It has a pair of blocking portions 54A and 54B in the form of plates or rods that are positioned at a slight distance. The blocking portions 54A and 54B are such that the surfaces facing each other are planes along a vertical plane orthogonal to the length direction of the frame side 5a. An insertion space 54F into which one end portion 62Aa of the support shaft 62A is inserted is formed between the pair of blocking pieces 54A and 54B (between vertical surfaces facing each other).

  The specific configuration of the blocking member 54 other than these points is not particularly limited, but in the case of this embodiment, the upper ends of a pair of plate-shaped blocking portions 54A and 54B along the vertical direction are integrally connected by the connecting portion 54C. Thus, the connecting portion 54C is extended toward the frame side 5a of the lower frame 5, and the inner side surface of the frame side 5a (corresponding to the inner side of the rectangular lower frame 5 is formed at the distal end portion of the extension portion 54D. A mounting portion 54E that contacts 5ab is formed, and the mounting portion 54E is fixed to the side surface 5ab inside the frame side 5a with a bolt or the like (not shown).

  The blocking member 54 does not come into contact with the receiving portion 52A of the base 52 (that is, a space S2 exists between the lower end surfaces of the blocking portions 54A and 54B and the upper surface of the receiving portion 52A). It is attached to the side 5a. Therefore, the blocking member 54 is separated from the base 52 (particularly, the receiving portion 52A and further the operating portion 52B) of the load cell 51A, and even if a force is applied to the blocking member 54 from the support shaft 62A as described later, the force Is not transmitted to the receiving portion 52A of the base 52 and further to the operating portion 52B.

  Further, a space S3 is maintained between the connecting portion 54C at the top of the blocking member 54 and the upper portion of the outer peripheral surface of the one end portion 62Aa of the support shaft 62A, so that the space S3 is held between the connecting portion 54C and the receiving portion 52A of the base 52. The distance is determined.

  One end portion 62Aa of the first support shaft 62A that connects the first inclined movable arm 61Aa (61Ab) to the insertion space 54F between the pair of blocking portions 54A and 54B of the blocking member 54 on the upper surface of the receiving portion 52A. (62Ab), for example, a part of the rolling element 41 is inserted. The first support shaft 62A is centered on the horizontal upper surface of the receiving portion 52A of the base 52 with the blocking portions 54A and 54B preventing movement of the frame 5a of the lower frame 5 in the length direction. Is rotatably mounted.

(Load detection operation)
In the bed main body 1A incorporating the two pairs of load cells 51A and 51B as described above, the load from the bed surface forming unit 100 such as the bed 2 is transferred from the upper frame 3 of the lifting support mechanism 6 to the lifting support mechanism 6. Via each member (mainly the first and second upper frame intermediate bars 67A and 67B, the upper tilting arms 64Aa and 64Ab; 64Ba and 64Bb, the first intermediate connection shaft 65A and the second intermediate connection shaft 65B), 4 In addition to the inclined movable arms 61Aa, 61Ab; 61Ba, 61Bb, the receiving shafts 52A of the load cells 51A, 51B are also provided from both end portions 62Aa, 62Ab; To join.

  FIG. 12A schematically shows a situation when a load is applied from the end portions of the support shafts 62A and 62B to the receiving portions 52A of the load cells 51A and 51B. In FIG. 12A, among the four load cells 51A and 51B in total, one end portion of the support shaft 62B that connects and supports the inclined movable arms 61Ba and 61Bb closer to the rear of the bed body (the end portion on the inclined movable arm 61Ba side). ) From 62Ba, a load G is applied to the receiving portion 52A of the load cell 51B. In FIG. 12A, the solid line shows the situation before the load G is applied, and the chain line shows the situation when the load G is applied.

  As shown in FIG. 12A, the receiving portion 52A of the load cell 51B is pushed downward by a load applied to the receiving portion 52A of the load cell 51B mainly from the one end portion 62Ba of the support shaft 62B via the tilting movable arm 61Ba. Thus, the distal end side (side closer to the receiving portion 52A) of the operating portion 52B continuing to the receiving portion 52A through the wall portion 52D is pushed downward. Since the rear end side (the side away from the receiving portion 52A) of the operating portion 52B is fixed to the frame side 5a of the lower frame 5 via the attachment portion 52C, the front end side bends in a direction lowering from the rear end side. Deformation and distortion will occur. Here, since the Roverval mechanism is formed by the hole portion 58 in the operating portion 52B, the deformation thereof is locally concentrated and expanded, and the resistance of the strain gauges R1, R2, R3, and R4 of the strain sensor 57 is increased. The voltage signal (distortion signal) corresponding to the magnitude of the distortion is generated by the Wheatstone bridge circuit.

  Specifically, as shown in FIG. 12A, the strain gauges R1, R2, R3, and R4 (only the strain gauges R1 and R2 appear in FIG. 12A) of the strain sensor 57 are attached to the upper surface side of the operating portion 52B. The tensile strain acts on the strain gauges (strain-sensitive resistors) R2 and R4 corresponding to the round hole 58a on one end side (the side away from the receiving portion 52A) of the hole portion 58 in the operating portion 52B. Compressive strain acts on strain gauges (strain sensitive resistors) R1 and R3 corresponding to the round holes 58b on the other end side of 58 (side closer to the receiving portion 52A), and the respective resistance values change, as shown in FIG. 12B. A voltage signal (distortion signal) corresponding to the magnitude of distortion is generated from the Wheatstone bridge circuit shown. Therefore, a signal corresponding to a change in load applied to the load cell 51A is output from the one end portion 62Ba of the support shaft 62B.

  Although not shown in the drawing, the other three load cells 51A and 51B also output signals corresponding to changes in the load applied from the ends of the support shafts 62A and 62B, respectively.

  Thus, the load detector 50 including the load cells 51A and 51B in total of four locations can detect a change in the load applied to the bed surface forming unit 100 such as the bed 2.

  Here, depending on the position of the bed user or the like on the bed surface T of the bed main body 1A and its movement, a biased load may be applied to the bed surface forming portion 100 of the bed main body 1A. Specifically, a bed user, a visitor, a medical person, etc., sits at the end of the bed surface T, or a user who is sleeping on the bed surface T greatly turns over to the end side of the bed surface T. Or standing up, the load applied to the bed surface forming unit 100 may be greatly biased (this state is referred to as an uneven load state).

In such an unbalanced load state, the loads applied to the four tilting movable arms 61Aa, 61Ab; 61Ba, 61Bb are not uniform, but four of the bed body 1A corresponding to each of the tilting movable arms 61Aa, 61Ab; 61Ba, 61Bb. By arranging the load cells 51A and 51B in a total of four locations near the corners, the load applied to each tilting movable arm, that is, the load applied to each position near the four corners of the bed main body can be individually detected and Thus, it is possible to know whether the load is biased or the state of the user H on the bed surface T of the bed main body 1A. The specific usage of such a load detection signal will be described in detail later.

  Here, in the case of the present embodiment, both end portions 62Aa, 62Ab; 62Ba, 62Bb of the support shafts 62A, 62B are structurally separated from the receiving portion 52A in the base 52 of each load cell 51A, 51B. , It is not fixed or continuously integrated with the receiving portion 52A. That is, both end portions 62Aa, 62Ab; 62Ba, 62Bb (rolling elements 41) of the support shafts 62A, 62B are rotatably mounted on the upper surface of the receiving portion 52A in the base 52 of each load cell 51A, 51B. Both end portions 62Aa and 62Ab of 62A and 62B; 62Ba and 62Bb (rolling elements 41) are allowed to move upward away from the upper surface of the receiving portion 52A.

Note that the rolling elements 41 of both end portions 62Aa and 62Ab of the first support shaft 62A near the front of the bed main body 1A are sandwiched by a pair of blocking portions 54A and 54B of the blocking member 54, but there are spaces above them. Since S3 exists, the rolling elements 41 of both end portions 62Aa and 62Ab of the first support shaft 62A are allowed to move upward away from the upper surface of the receiving portion 52A.

  By the way, as described above, when an unbalanced load is applied to the bed surface forming portion 100 of the bed main body 1A, the side where the load is not applied to the bed main body 1A (or the side where the load is small) may float. In this case, assuming that the base 52 of the load cells 51A and 51B is not separated from the support shafts 62A and 62B (fixed or continuously integrated), an upward force is applied to the load cells 51A and 51B from the support shafts 62A and 62B. May be added. In that case, the load cell 51A, 51B detects the upward force as a load upward in the vertical direction (that is, a negative load with respect to a load downward in the vertical direction that should be detected originally), and there is an error with respect to the original load detection. There is a concern that it will grow.

However, in this embodiment, both end portions 62Ba and 62Bb (the rolling element 41 portions) of the support shafts 62A and 62B and the base 52 of the load cells 51A and 51B are separated in the vertical direction. Even if a vertical upward load (negative load) as described above is applied, the force is not transmitted to the base 52, and therefore the operating portion (cantilever portion) 52B of the base 52 is not bent. Only downward load can be detected with high accuracy.

  The blocking member 54 for blocking the movement of the first support shaft 62A near the front of the bed main body 1A is separated from the base 52 of the load cell 51A (particularly not in contact with the receiving portion 52A of the base 52). Even if a load component in a direction other than the vertically downward direction is applied to the blocking member 54 from the first support shaft 62A to the blocking member 54 due to a load, an impact, or the like, the load component is not applied to the receiving portion 52A of the base body 52. Even on the front side of the bed body 1A, only the downward load in the vertical direction can be detected with high accuracy.

  The receiving portions 52A of the base 52 in the load cells 51A and 51B are portions that rotatably support both end portions 62Ba and 62Bb of the support shafts 62A and 62B, for example, the rolling elements 41. In order to perform the raising / lowering operation and the tilting operation smoothly, the support shafts 62A, 62B can be smoothly rotated (therefore, the rolling elements 41 provided on the tilting movable arms 61Aa, 61Ab; 61Ba, 61Bb can rotate smoothly). It is desirable to configure as described above.

Here, if the resistance of the receiving portion 52A with respect to the rotation of the support shafts 62A and 62B is large, a force in a direction deviating from the lower side in the vertical direction from the support shafts 62A and 62B is applied to the receiving portion 52A from the support shafts 62A and 62B. In that case, the accuracy of the original load detection may be reduced. Therefore, it is desirable that the resistance of the receiving portion 52A with respect to the rotation of the both end portions 62Aa, 62Ab; 62Ba, 62Bb of the support shafts 62A, 62B be as small as possible.

From such a viewpoint, it is desirable to provide the rolling elements 41 at both end portions 62Aa, 62Ab; 62Ba, 62Bb of the support shafts 62A, 62B as described above. Even in such a case, it is desirable that the resistance between the rolling elements 41 and the receiving portion 52A of both end portions 62Aa, 62Ab; 62Ba, 62Bb of the support shafts 62A, 62B is as small as possible. For this purpose, at least one of the outer peripheral surfaces (the outer peripheral surface of the rolling element 41) of the both end portions 62Aa and 62Ab; 62Ba and 62Bb of the support shafts 62A and 62B and the upper surface of the receiving portion 52A is a smooth surface (for example, a mirror surface). ) Is desirable. In some cases, at least one of these surfaces may be subjected to a surface treatment for reducing frictional resistance, or a low friction (solid lubricity) film such as a fluorine resin coating.

  In any case, the lower end portions (support shafts 62A, 62B) of the lifting support mechanism 6 and the receiving portions 52A of the base 52 in the load cells 51A, 51B are separated and independent, and both end portions 62Aa of the support shafts 62A, 62B. 62Ab; 62Ba, 62Bb (the rolling element 41 portion) and the receiving portion 52A of the base 52 are in contact with each other in the vertical direction so that only the load component in the vertical downward direction is applied to the base 52. The load cells 51A and 51B are interposed between the lower end portions (support shafts 62A and 62B) of the elevating support mechanism 6 and the lower frame 5 (frame side 5a). The configuration of the lower frame 5 may be substantially the same as when the load cells 51A and 51B are not interposed. This means that load cells 51A and 51B can be easily incorporated into a commercially available bed that does not have a load detection function (a bed that is not provided with load cells 51A and 51B), and the load detection function is easy. It can be added to.

  As described above, in the bed with a load detection function of the present embodiment, the load cells 51A and 51B are respectively incorporated in the portions corresponding to the four corners (front left side, front right side, rear left side, rear right side) of the bed body 1A. These four load cells 51A and 51B detect changes in the load applied to the vicinity of the four corners of the bed main body 1A. The load signals detected by the four load cells 51A and 51B are output to the calculation unit 59A (see FIG. 1). Then, the mode of use of the load signal in the actual bed will be described below with reference to FIG. 1 again.

  The calculation unit 59A is composed of a computer having a ROM, a RAM, other memory, a CPU, and the like, and programs, numerical values, and the like necessary for calculating the state of the user H on the bed surface T of the bed body 1A are stored in advance. ing.

  And in this calculating part 59A, based on the load signal output from the said four load cells 51A and 51B, the state of the user H on the bed surface T of the bed main body 1A is calculated, and the calculation result is transmitted to the transmitting part 59B. Output to.

  For example, the calculation unit 59A uses the load signal output from the four load cells 51A and 51B when the total load applied to the four load cells 51A and 51B is larger than a prestored threshold value. It is determined that the person H is present on the bed surface T of the bed body 1A, and the calculation result is output to the transmission unit 59B.

  In addition, in the calculation unit 59A, in addition to entering the user H (sleeping) and leaving the bed (getting up), for example, the moving distance of the center of gravity position of the user H on the bed surface T of the bed body 1A and / or Alternatively, it is possible to perform a calculation for predicting the user H's getting out of bed from the moving speed. Furthermore, it is possible to detect the body movement (eg, turn over etc.) and posture (eg: supine, prone, lying down, etc.) of the user H by calculation, and further predict the occurrence of bedsores as will be described later. It is also possible.

  The transmission unit 59B is a transmitter attached to the bed body 1A, and transmits the result calculated by the calculation unit 59A to the remote reception unit 59C. On the other hand, the receiving unit 59C is a receiver that receives the signal transmitted from the transmitting unit 59B, and remotely monitors the state of the user H (the occupancy status) by receiving the signal from the transmitting unit 59B. It becomes possible.

  On the receiving unit 59C side, the detection results detected by the load cells 51A and 51B and the calculation results by the calculation unit 59A can be displayed on a monitor (not shown) or output to a printer, for example. .

  Further, from the calculation result by the calculation unit 59A, for example, the state of the user H may be notified to the monitor as necessary. The notification method is not particularly limited, and for example, it is possible to issue an alarm from a speaker (not shown) or display on a monitor.

[Application examples of load detection]
The bed 1 with a load detection function having the above-described structure is suitably used, for example, in a medical facility (eg, hospital, clinic, etc.), a nursing facility, a nursing facility, and the like.

  In the present invention, by using such a bed 1 with a load detection function, for example, getting into bed (sleeping), getting out of bed (getting up), standing position, body movement (eg, turning over, etc.), posture (eg: It becomes possible to remotely monitor the state of the user H (the presence of bed) such as supine, prone, and lying.

Further, by using such a bed 1 with a load detection function, the mental burden of the user H being monitored by a third party, and the user H must be constantly monitored, not limited to midnight or early morning. It is possible to reduce the physical and mental burden of the observer who must do.

  In addition, such a bed 1 with a load detection function is not limited to the facilities mentioned above, for example, accommodation facilities (eg, hotels, inns, etc.), general homes (eg, home care, etc.), etc. Can also be used. That is, the usage form of the bed 1 with the load detection function is not particularly limited.

  Moreover, as an application example using the load detection function of the bed 1 with a load detection function to which the present invention is applied, for example, a “floor slip prevention function” can be cited. Specifically, when the center of gravity has not moved outside a certain circle for a certain time (for example, 2 hours) or more, or the load change of each load cell 51A, 51B has changed by a certain (for example, 1 kg) or more. If not, it is possible to add a function of determining that there is a possibility of a bed slip in the user H and notifying the supervisor.

  Another application example is “lighting control function”. Specifically, when entering or leaving the floor by measuring the presence or absence of the weight of the user H on the bed surface T of the bed body 1A, the position of the center of gravity, the amount of movement of the center of gravity, the movement speed of the center of gravity, etc. It is possible to add a function of turning on or off the illumination.

  Another application example is “weight management function”. Specifically, it is possible to add a function of managing the weight of the user H by periodically measuring the weight of the user H on the bed surface T of the bed main body 1A (for example, every day at a fixed time). It is.

  Another application example is “air conditioning management function”. Specifically, by detecting the body movement (such as turning over) of the user H on the bed surface T of the bed body 1A, the sleep depth of the user H is measured, and the air conditioning is managed according to the state of the user. It is possible to add a function such as

  Another application example is “weight monitoring function during dialysis”. Specifically, it is possible to add a function of detecting the start and end of dialysis by measuring the weight of the user H on the bed surface T of the bed body 1A.

  As described above, in the present invention, various functions can be added by using the load detection function of the bed 1 with the load detection function as well as the above-described functions.

  Further, in the present invention, even if the load detector 50 to which the present invention is applied is a bed with a load detection function incorporated in advance in the bed main body 1A, the load detector 50 to which the present invention is applied is separately incorporated in the bed main body 1A. As a result, a load detection function may be added to an existing bed.

  That is, the bed with a load detection function to which the present invention is applied measures the change in the load applied to the bed main body 1A by the load detector 50 attached to the bed main body 1A in advance or separately, thereby allowing the bed of the bed main body 1A to sleep. It is possible to detect the state of the user H on the surface T.

  Further, in this embodiment, by attaching the load cells 51A and 51B of the load detector 50 to the bed main body 1A, it is possible to add a load detection function to the bed with a simple structure while suppressing an increase in the number of parts. It has become. That is, as already described, in the present embodiment, the base 52 of the load cells 51A and 51B is placed between the lower end portion (support shafts 62A and 62B) of the elevating support mechanism 6 and the lower frame 5 (frame side 5a). It is possible to provide a load detection function simply by interposing them in the. Therefore, it is possible to add a load detection function to an existing bed at a low cost. Further, even when a failure or the like occurs in the load cells 51A and 51B, the replacement can be easily performed. Furthermore, since there is little difference with the existing bed, it is possible for the user H to use the bed without a sense of incongruity.

[Another example of load cell substrate]
Note that the load cells 51A and 51B are not necessarily limited to those in the above example, and various modifications can be made without departing from the spirit of the present invention. Therefore, another example of the load cells 51A and 51B will be described below.

[Second example of load cell]
A base 52 of a second example of the load cell 51B near the back of the bed main body 1A (that is, the side allowing the movement of the support shaft in the frame side length direction) is shown in FIGS. FIG. 19 shows a state in which the base 52 is attached to the frame side 5b of the lower frame 5.

  The second example base 52 shown in FIGS. 16 to 19 receives one end portion 62Ba (62Bb) of the support shaft 62B in the same manner as the first example base 52 shown in FIGS. The receiving portion 52A on which the load from the support shaft 62B acts, the operating portion 52B that is integrally and continuously connected to the receiving portion 52A, the deformation portion that is distorted by the load applied to the receiving portion 52A, and the operating portion 52B that are integrally connected, The bed main body 1 </ b> A includes a mounting portion 52 </ b> C that is fixed to the frame side 5 a of the lower frame 5. However, unlike the case of the base 52 of the first example shown in FIGS. 8 to 11, the operating portion 52B of the base 52 of the second example is 2 in the length direction of the frame side 5a of the lower frame 5. It is divided into two divided operation parts 52Ba and 52Bb.

  That is, the actuating part 52B is composed of two split actuating parts 52Ba, 52Bb formed at intervals in the length direction of the frame side 5a (and hence the front-rear direction of the bed main body), and the two split actuating parts 52Ba, A space 52c is formed between 52Bb, and a strain sensor 57 is attached to each of the split operation portions 52Ba and 52Bb. In this case, at least the tip end portion (at least a part of the rolling element 41) of the one end portion 62Ba (62Bb) of the support shaft 62B is configured to be inserted into the space portion 52c of the split operation portions 52Ba and 52Bb. desirable.

  In the load cell 51B of the present example, the dividing operation portions 52Ba and 52Bb in the base 52 are also arranged so that the direction from one end side (side continuous to the receiving portion 52A) to the other end side (side continuous to the mounting portion 52C) is the frame. It is along the direction orthogonal to the length direction of the side 5a. In other words, the base body 52 is arranged in such a direction that each hole 58 for constituting the Roverval mechanism penetrates in a direction parallel to the length direction of the frame side 5a.

  The configuration of the load cell 51A near the front of the bed body (support axis linear movement blocking side) used in combination with the load cell 51B of the second example near the bed body rear side (support axis linear movement allowable side) as described above is as follows. Although not particularly limited, it is desirable to have the same configuration as the load cell 51B of the second example. Then, a blocking member similar to the blocking member 54 already described (see FIGS. 13 to 15) is attached, or the width of the space portion 52c between the above-described split operation portions 52Ba and 52Bb is narrowed, and the support shaft 62A It may be configured to prevent the movement of.

  In the load cells 51A and 51B using the base body 52 of the second example as described above, the strain sensors 57 are respectively attached to the both ends of the base body 52 in the length direction of the frame side 5a. Therefore, even when an uneven load is applied to the bed surface T of the bed main body 1A, that is, even when an uneven load state occurs, the detection accuracy of the downward load in the vertical direction can be improved.

  That is, as already described, a bed user, a visitor, a medical staff, etc. sit at the end of the bed surface T, or a user sleeping on the bed surface T is on the end side of the bed surface T. The bed main body 1A may be slightly distorted as a whole when the load applied to the bed surface T is significantly biased (unbalanced load state). In that case, with the distortion, the support shafts 62A and 62B are twisted (here, the twist means that the center axis is inclined with respect to the center axis direction of the original support shaft). May end up. In such a case, a force in the tilt direction is applied to the receiving portion 52A of the base 52 in the load cells 51A and 51B due to the twist of the support shafts 62A and 62B. This means that a component of force in a different direction is applied to the receiving portion 52A of the base body 52 of the load cells 51A and 51B with respect to a load (force) in the vertical direction that is originally detected by the load cells 51A and 51B. As a result, the load in the vertical direction cannot be detected accurately, and the load detection accuracy may be reduced.

  However, if strain sensors 57 are respectively attached to both end portions of the base 52 in the length direction of the frame side 5a, the load shafts 62A can be obtained by summing or averaging the load signals from the two strain sensors 57. , The influence of the force component in the extra direction due to the twist of 62B or the like can be canceled, and the vertically downward load can be detected more accurately.

  Furthermore, in the case of the present example, the frame side 5a is configured such that at least the tip of the one end portion 62Ba (62Bb) of the support shaft 62B is inserted into the space portion 52c between the split operation portions 52Ba and 52Bb. For the load cell 51B on the side where the movement of the support shaft in the longitudinal direction is allowed, a stopper against excessive movement of the end surfaces of the split operation portions 52Ba and 52Bb opposite to each other exceeding the allowable movable range of the support shaft 62B It functions as a (drop-off prevention part), and can effectively prevent an accident in which the support shaft 62B falls off the receiving part 52A and falls. That is, the end surfaces of the split operation portions 52Ba and 52Bb facing each other can perform the same function as, for example, a drop-off prevention portion 31C shown in FIG. 48 described later.

[Third example of load cell]
A base 52 of a third example of the load cell 51B on the rear side of the bed main body 1A (that is, the side allowing the movement of the support shaft in the frame side length direction) is shown in FIGS. FIG. 23 shows a state in which the base 52 is attached to the frame side 5a of the lower frame 5.

  The base 52 of the third example shown in FIGS. 20 to 23 receives the one end portion 62Ba (62Bb) of the support shaft 62B in the same manner as the base 52 of the first example shown in FIGS. The receiving portion 52A on which the load from the support shaft 62B acts, the operating portion 52B that is integrally and continuously connected to the receiving portion 52A, the deformation portion that is distorted by the load applied to the receiving portion 52A, and the operating portion 52B that are integrally connected, The bed main body 1 </ b> A includes a mounting portion 52 </ b> C that is fixed to the frame side 5 a of the lower frame 5. However, the attachment part 52C in the base 52 of the third example is different from the case of the base 52 in the first example shown in FIGS. It is configured to be attached to the lower surface 5ac. That is, the upper surface of the attachment portion 52C is in contact with the lower surface 5ac of the frame side 5a from below, and an attachment hole 52Cc is formed through the attachment portion 52C so as to penetrate through the attachment hole 52Cc. The base 52 is fixed to 5a.

  The configuration of the load cell 51A on the front side of the bed body (support axis linear movement blocking side) used in combination with the load cell 51B of the third example on the back side of the bed body (support axis linear movement allowable side) as described above is as follows. Although not particularly limited, it is desirable to have the same configuration as the load cell 51B of the third example. Then, a blocking member similar to the blocking member 54 (see FIGS. 13 to 15) already described may be attached so as to block the movement of the support shaft 62 </ b> A.

  In the base configuration of the third example as described above, the base 52 can be reduced in size, and thus reduced in weight and cost. In addition, when a part of the base 52 protrudes outside the frame side 5a of the lower frame 5, there is a concern that an accident may occur in which a bed user, a medical person, or the like hooks his / her foot on the protruding part. However, in this example, since the base body 52 does not protrude outside the frame side 5a, such a concern can be solved.

[Fourth example of load cell]
The base 52 for the fourth example of the load cell 51B near the rear of the bed main body 1A (that is, the side allowing the movement of the support shaft in the frame side length direction) is shown in FIGS. FIG. 27 shows a state in which the base 52 is attached to the frame side 5 a of the lower frame 5.

  The base 52 of the fourth example shown in FIGS. 24 to 27 receives the one end portion 62Ba (62Bb) of the support shaft 62B in the same manner as the base 52 of the first example shown in FIGS. The receiving portion 52A on which the load from the support shaft 62B acts, the operating portion 52B that is integrally and continuously connected to the receiving portion 52A, the deformation portion that is distorted by the load applied to the receiving portion 52A, and the operating portion 52B that are integrally connected, The bed main body 1 </ b> A includes a mounting portion 52 </ b> C that is fixed to the frame side 5 a of the lower frame 5. However, the attachment portion 52C in the base 52 of the fourth example is different from the case of the base 52 in the first example shown in FIGS. 8 to 11 in that the attachment 52C is provided on the frame side 5a of the lower frame 5. It is configured to be attached to the upper surface 5ad. That is, the lower surface of the attachment portion 52C is in contact with the upper surface 5ad of the frame side 5a from the upper side, and an attachment hole 52Cc is formed through the attachment portion 52C so as to penetrate through the attachment portion 52C. The base 52 is fixed to 5a.

  The configuration of the load cell 51A closer to the front of the bed body (support axis linear movement blocking side) used in combination with the load cell 51B of the fourth example closer to the bed body rear side (support axis linear movement allowable side) as described above is as follows. Although not particularly limited, it is desirable to have the same configuration as that of the load cell 51B of the fourth example. Then, a blocking member similar to the blocking member 54 (see FIGS. 13 to 15) already described may be attached so as to block the movement of the support shaft 62 </ b> A.

  Even in the configuration of the fourth example as described above, it is possible to reduce the size of the base 52, and hence to reduce the weight and cost. In addition, when a part of the base 52 protrudes outside the frame side 5a of the lower frame 5, there is a concern that an accident may occur in which a bed user, a medical person, or the like hooks his / her foot on the protruding part. However, in this example, since the base body 52 does not protrude outside the frame side 5a, such a concern can be solved.

[Fifth example of load cell]
FIGS. 28 to 30 show a base 52 of a fifth example of the load cell 51B near the back of the bed main body 1A (that is, the side allowing the movement of the support shaft in the frame side length direction).

  The base 52 of the fifth example shown in FIGS. 28 to 30 receives the one end portion 62Ba (62Bb) of the support shaft 62B in the same manner as the base 52 of the first example shown in FIGS. The receiving portion 52A on which the load from the support shaft 62B acts, the operating portion 52B that is integrally and continuously connected to the receiving portion 52A, the deformation portion that is distorted by the load applied to the receiving portion 52A, and the operating portion 52B that are integrally connected, The bed main body 1 </ b> A includes a mounting portion 52 </ b> C that is fixed to the frame side 5 a of the lower frame 5. However, the operating portion 52B in the base 52 of the fifth example has a length in the length direction of the frame side 5a of the lower frame 5 shorter than the length in the same direction of the receiving portion 52A, and the receiving portion 52A It is formed at a position corresponding to the center in the same direction.

  The configuration of the load cell 51A near the front of the bed body (support axis linear movement blocking side) used in combination with the load cell 51B of the fifth example near the bed body rear side (support axis linear movement allowable side) as described above is as follows. Although not particularly limited, it is desirable to have the same configuration as the load cell 51B of the fifth example. Then, a blocking member similar to the blocking member 54 (see FIGS. 13 to 15) already described may be attached so as to block the movement of the support shaft 62 </ b> A.

  In the configuration of the fourth example as described above, when an unbalanced load state as described above occurs and a force that tilts the receiving portion 52A from the horizontal plane acts on the receiving portion 52A, in other words, on the receiving portion 52A. Even when a force in the twisting direction is applied, the twist is not substantially transmitted to the operating portion 52B, so that a downward load in the vertical direction can be detected with higher accuracy. In addition, the substrate 52 can be reduced in size, and thus reduced in weight and cost.

[Sixth example of load cell]
FIGS. 31 to 33 show a base 52 of a sixth example of the load cell 51B near the rear of the bed main body 1A (that is, the side allowing the movement of the support shaft in the frame side length direction). FIG. 34 shows a state in which the base 52 is attached to the frame side 5b of the lower frame 5.

  The base 52 of the sixth example shown in FIGS. 31 to 34 receives one end portion 62Ba (62Bb) of the support shaft 62B in the same manner as the base 52 of the first example shown in FIGS. The receiving portion 52A on which the load from the support shaft 62B acts, the operating portion 52B that is integrally and continuously connected to the receiving portion 52A, the deformation portion that is distorted by the load applied to the receiving portion 52A, and the operating portion 52B that are integrally connected, The bed main body 1 </ b> A includes a mounting portion 52 </ b> C that is fixed to the frame side 5 a of the lower frame 5. However, unlike the base 52 of the first example shown in FIGS. 8 to 11, the base 52 of the fifth example has a shape in which a plate-like member is bent into a substantially L shape as a whole. .

  That is, the plate-like operating portion 52B rises vertically from one edge in the width direction of the long plate-like horizontal receiving portion 52A extending in the length direction of the frame side 5a of the lower frame 5, and the plate-like operating portion 52B rises vertically. On the extension of the upper part of the operation part 52B, a long plate-like vertical attachment part 52C is integrally continuous. Further, the operating portion 52B is formed with a space portion 52Bc in the shape of an elongated hole along the length direction of the frame side 5a at the center portion thereof, and the cut portions 52Bd and 52Be are formed symmetrically from both sides toward the center. Thus, the configuration is made up of two section actuating portions 52Bf and 52Bg having a narrow width. And the strain sensor 57 which consists of a strain gauge as already described respectively is attached to any plate surface in each division operation part 52Bf and 52Bg.

  The configuration of the load cell 51A near the front of the bed body (support axis linear movement blocking side) used in combination with the load cell 51B of the sixth example near the bed body rear side (support axis linear movement allowable side) as described above is as follows. Although not particularly limited, it is desirable to have the same configuration as the load cell 51B of the sixth example. Then, a blocking member similar to the blocking member 54 (see FIGS. 13 to 15) already described may be attached so as to block the movement of the support shaft 62 </ b> A.

  Also in the base body 52 of the sixth example as described above, the section actuating parts 52Bf and 52Bg are distorted by the load applied to the receiving part 52A, and the two strain sensors 57 detect the distortion and output it as a load signal. can do.

In the load cell 51B using the base body 52 of the sixth example, similarly to the base body 52 of the second example shown in FIGS. 16 to 19, the both ends of the base body 52 in the length direction of the frame side 5a. The strain sensor 57 is attached to each part. Therefore, even when an uneven load is applied to the bed surface T of the bed main body 1A, that is, even when an uneven load state occurs, the detection accuracy of the downward load in the vertical direction can be improved.
Further, since the entire base 52 is formed in a plate shape, the base material can be reduced, and therefore the cost and weight of the base can be reduced.
Furthermore, since the projecting length to the inside of the lower frame 5 is small, the base body can be easily incorporated into an existing bed without making a major design change.

[Seventh example of load cell]
Next, a seventh example of the pair of load cells 51B on the side that allows the movement of the support shaft (the rear side of the bed main body) and the attached state thereof will be described with reference to FIGS.
The pair of left and right load cells 51B and their attachment and support conditions are symmetrical on the left and right sides of the bed body. Therefore, FIGS. 35 to 38 show the load cells on one side (for example, the left side) of the pair of left and right load cells 51B. Only 51B is shown.

A load cell 51B shown in FIG. 36 includes a receiving plate 10, a base 52, and a strain sensor 57. FIG. 35 shows a base 52 and a pair of strain sensors 57 and 57 attached to the base 52 in the load cell 51B of the seventh example, and FIGS. 36 to 38 show the load cell 51B incorporated in the bed body. The state, that is, the state in which the load cell 51B is attached to the frame side 5a of the lower frame 5 and the load cell 51B receives (supports) one end portion 62Ba (rolling element 41) of the support shaft 62B is shown.
Here, the frame side 5a of the lower frame 5 is made of a rectangular tube, and its cross section has a substantially rectangular shape. The frame side 5a is provided in parallel to the installation surface B (see FIG. 1).

  As shown in FIG. 35, the base 52 receives one end portion 62Ba (62Bb) of the support shaft 62B, and receives a receiving portion 52A on which a load from the support shaft 62B acts, and the receiving portion 52A integrally and continuously. The operating portion 52B is distorted and deformed by a load applied to the receiving portion 52A, and the mounting portion 52C is integrally connected to the operating portion 52B and is fixed to the frame side 5a of the lower frame 5 in the bed main body 1A. . In addition, strain sensors 57 and 57 are attached to the operating portion 52B.

  As shown in FIGS. 36 to 38, the receiving portion 52A of the base 52 has a long plate shape extending along the length direction of the frame side 5a. Similarly, the length of the frame side 5a is formed on the receiving portion 52A. A receiving plate 10 having a long plate shape extending in the vertical direction is placed. Furthermore, one end portion 62Ba (62Bb) of the support shaft 62B is mounted on the receiving plate 10. That is, the receiving plate 10 is interposed between the receiving portion 52A of the base 52 and one end portion 62Ba (62Bb) of the support shaft 62B, for example, between the receiving portion 52A and the rolling element 41.

  A holding member 11 is attached above the receiving plate 10. The holding member 11 includes an attachment portion 11A that is fixed to the frame side 5a and extends in the vertical direction, and an extension portion 11B that is bent from the lower end of the attachment portion 11A and extends in the horizontal direction. Two suspension shafts 12 and 12 are suspended from the extending portion 11B. The suspension shaft 12 is inserted with play through insertion holes 10a provided in the vicinity of both ends in the longitudinal direction of the receiving plate 10, and a stopper 13 is attached to the tip of the insertion.

  Here, the base body 52 corresponds to a so-called strain body, and in this case as well, each cantilever type (cantilever type) configuration having a Roverval mechanism is applied, as in each of the examples already described. Has been.

  The receiving portion 52A of the base 52 has a long plate shape extending along the length direction of the frame side 5a, and the plate surface is horizontal in a state of being incorporated in the bed main body. A part of the outer peripheral surface of the one end portion 62Ba (62Bb) of the support shaft 62B (the lower portion of the outer peripheral surface of the rolling element 41) is mounted on the upper surface of the long plate-shaped receiving portion 52A. Part.

  The receiving plate 10 is placed in surface contact with the upper surface of the receiving portion 52A of the base 52, and is supported on the upper surface of the long plate shape in the length direction (the length direction of the frame side 5a; the longitudinal direction of the bed body). The shaft 62B can roll. That is, one end portion 62Ba (62Bb) of the support shaft 62B is rotatably supported while allowing movement of the frame side 5a in the length direction.

From one edge in the width direction of the long plate-shaped receiving portion 52A, a vertical wall portion 52D that is continuous with the long plate-shaped receiving portion 52A is raised. From the upper part of the wall part 52D, a relatively thick long plate-like actuating part 52B continuously extending integrally with the wall part 52D extends horizontally on the opposite side to the long plate-like receiving part 52A. ing. The thick plate-like actuating part 52B is a part corresponding to a so-called cantilever part, and the actuating part 52B has a hole 58 for constituting a Roverval mechanism in the length direction of the actuating part 52B. (That is, along a horizontal direction parallel to the length direction of the frame side 5a).
On the upper surface of the long plate-like operating portion 52B, a pair of strain sensors 57, 57 are attached in the vicinity of both ends in the longitudinal direction. Each strain sensor 57 includes four strain gauges R1, R2, R3, and R4 (strain sensitive resistors).

  Further, a mounting portion 52C having a vertical wall shape is formed integrally and continuously from the edge in the width direction on the side opposite to the wall portion 52D in the long plate-like operation portion 52B. A plurality (four in the illustrated example) of mounting holes 52Ca penetrating in the horizontal direction are formed in the vertical wall-shaped mounting portion 52C. These attachment holes 52Ca are for attaching the base body 52 of the load cell 51B to the frame side 5a of the lower frame 5 with, for example, bolts 53 as will be described later.

The load cell 51B of the seventh example has a plurality of strain sensors 57 and 57, and the strain sensors 57 and 57 are attached in the vicinity of both end portions on the upper surface of the long plate-like operating portion 52B. One strain sensor 57 may be attached to the center of the upper surface of the operating portion 52B.
However, as shown in the seventh example, when a plurality of strain sensors are attached to the operating portion 52B, the outputs of the respective strain sensors 57 can be summed or averaged to obtain the total output. As a result, errors due to individual differences in noise and strain gauges can be removed to enable more accurate measurement.

  In the load cell 51B, the receiving plate 10 is placed on the upper surface of the receiving portion 52A of the base 52. Further, the rolling element 41 of the one end portion 62Ba (62Bb) of the support shaft 62B is placed on the upper surface of the receiving plate 10 so as to be able to roll in the longitudinal direction of the receiving plate 10, and the one end portion 62Ba (62Bb) is provided. The load from the support shaft 62B is transmitted to the receiving portion 52A.

  The rolling element 41 of the one end portion 62Ba (62Bb) has a circular outer periphery so that it can roll on the receiving plate 10, so that the receiving plate 10 and the one end portion 62Ba (62Bb) are in contact with each other. Is in line contact. On the other hand, the upper surface of the receiving portion 52A and the lower surface of the receiving plate 10 are in surface contact. Therefore, when the local load of the linear distribution applied to the receiving plate 10 from the one end portion 62Ba (62Bb) is transmitted from the receiving plate 10 to the receiving portion 52A, it is averaged into a planar shape. Therefore, a substantially uniform load is applied to the receiving portion 52A on the upper surface, and the base 52 is less likely to be unevenly deformed in the longitudinal direction.

When the receiving plate 10 is not interposed, a linear load is directly transmitted from the rolling element 41 of the one end portion 62Ba (62Bb) to the receiving portion 52A of the base 52. Here, if the one end portion 62Ba (62Bb) is positioned near the end portion with respect to the longitudinal direction of the receiving portion 52A, in that case, the base portion 52 is greatly deformed near the end portion, and the opposite side. The amount of deformation is relatively small in the vicinity of the end of the. In this case, since the base 52 itself is twisted, there is a possibility that the strain sensors 57 and 57 detect the strain of the twist component and cannot perform accurate measurement.
On the other hand, when the receiving plate 10 is interposed between the receiving portion 52A of the base 52 and the rolling element 41 of the one end portion 62Ba (62Bb) of the support shaft 62B, the base 52 is deformed unevenly. It is possible to suppress twisting.

  As shown in FIG. 38, the base 52 of the load cell 51B has the side surface 52Cb of the mounting portion 52C as the inner side surface 5ab of the frame side 5a of the lower frame 5 (the side surface corresponding to the inside of the rectangular lower frame 5). The operating portion 52B and the receiving portion 52A are arranged and attached so as to extend to the inside of the lower frame 5 in surface contact.

Similarly, the holding member 11 is disposed and attached such that the side surface 11Ab of the attachment portion 11A is brought into surface contact with the attachment portion 52C of the base 52, and the extension portion 11B extends to the inside of the lower frame 5. Yes.
The base 52 and the holding member 11 are connected and fixed by inserting bolts 53 into mounting holes 52Ca provided in the mounting portion 52C of the base 52 and holes (not shown) provided in the mounting portion 11A of the holding member 11. The bolt 53 is screwed to the frame side 5a.

  The extending portion 11B of the holding member 11 has a long plate shape that extends along the length direction of the frame side 5a. The suspension shaft 12 is suspended from the vicinity of both ends in the longitudinal direction of the extending portion 11B. These suspension shafts 12 and 12 are inserted through the insertion holes 10a and 10a of the receiving plate 10 below the extending portion 11B. As described above, the receiving plate 10 has a long plate shape extending along the length direction of the frame side 5a, and the insertion holes 10a are formed at both ends in the longitudinal direction. The insertion hole 10a has a larger diameter than the shaft portion 12b of the suspension shaft 12. When the suspension shaft 12 is inserted, a slight play 14 is formed in the radial direction (see FIG. 38). . That is, the receiving plate 10 is placed on the receiving portion 52A of the base 52 and allows its movement within the range of the play 14 formed between the insertion hole 10a and the shaft portion 12b of the suspension shaft 12. The position is held almost constant.

A stopper 13 is attached to the tip of the suspension shaft 12. The retainer 13 is disposed with a gap d between the bottom surface of the receiving plate 10.
By the way, the receiving portion 52A of the base body 52 sinks due to distortion deformation in the operating portion 52B. If this sinking exceeds a predetermined value (hereinafter referred to as a limit sinking amount) depending on the shape and material of the substrate 52, the substrate 52 may be damaged. More specifically, the base 52 may yield or break.

  The gap d is formed narrower than this limit sinking amount. Thereby, when a load that causes damage to the base 52 (hereinafter referred to as overload) is applied from the one end portion 62Ba (62Bb) of the support shaft 62B to the receiving portion 52A of the base 52 through the receiving plate 10, The stopper 13 interferes with the lower surface of the receiving plate 10, and a part of the overload can be received by the suspension shaft 12. That is, it is possible to prevent an overload from being applied to the receiving portion 52 </ b> A of the base 52 and to avoid damage to the base 52.

  The suspension shaft 12 is inserted in the vicinity of both ends in the longitudinal direction of the receiving plate 10. Thereby, the operating range of the support shaft 62B tilting on the receiving plate 10 via the rolling elements 41 of the one end portion 62Ba (62Bb) can be limited. That is, even if the support shaft 62B rolls (moves) along the length direction of the frame side 5a and exceeds the longitudinal end portion of the receiving plate 10, the suspension shaft is connected to one end portion 62Ba of the support shaft 62B. It is possible to prevent the support shaft 62B from sliding off the receiving plate 10 by interfering with the rolling element 41 of (62Bb). Therefore, the suspension shaft 12 is positioned on both sides of the allowable movable range in the frame side length direction of the second support shaft 62B, and the second support shaft 62B exceeds the allowable movable range in the frame side length direction. It also serves as a dropout prevention function for preventing the dropout. In other words, the two suspension shafts 12 also serve as dropout prevention members as a whole.

In the present embodiment, the suspension shaft 12 is a bolt composed of a head portion 12a and a shaft portion 12b, and the retainer 13 is a nut screwed to the bolt (suspending shaft 12). With this configuration, the size of the gap d formed between the retainer 13 and the receiving plate 10 can be appropriately adjusted according to the material and shape of the base 52. Further, as the retainer 13, a double nut mechanism may be formed using two nuts so that loosening is suppressed by vibration.
Furthermore, as the suspension shaft 12, a bolt inserted from below to above may be disposed, and the suspension shaft 12 may be screwed to the extending portion 11 </ b> B of the holding member 11. In this case, the bolt head located at the lower end of the suspension shaft 12 functions as a retaining member 13.

  On the other hand, FIGS. 39 to 41 show an example of a pair of load cells 51A on the side (near the front of the bed main body) that prevents the movement of the support shaft and the mounting state thereof. The load cell 51A basically also has a base 52 having a receiving portion 52A, an operating portion 52B, and an attachment portion 52C, like the pair of load cells 51B on the side (rear side of the bed main body) that allows the support shaft 62B to move. And a strain sensor 57 attached to the operating portion 52B. The specific configurations of the base body 52 and the strain sensor 57 in the load cell 51A may be the same as those of the load cell 51B described above, and therefore the details thereof are omitted here.

  For the pair of load cells 51A on the side that prevents the movement of the support shaft 62A (front side of the bed main body), the pair of load cells on the side that allows the movement of the support shaft 62B (the rear side of the bed main body) already described. Unlike 51B, a blocking member 54 is provided.

The blocking member 54 includes a pair of blocking portions 54A and 54B extending downward from the extending portion 11B of the holding member 11. The blocking portions 54A and 54B are spaced above the receiving plate 10 in the length direction of the frame side 5a with an interval equal to (or slightly larger than) the outer diameter of the rolling element 41 of the one end portion 62Aa of the support shaft 62A. An insertion space 54F into which one end portion 62Aa (the portion of the rolling element 41) of the support shaft 62A is inserted is formed between the pair of blocking portions 54A and 54B.
The configuration of the blocking member 54 is not specifically limited as long as the movement of the support shaft 62A can be blocked. In the present embodiment, the blocking member 54 is formed integrally with the extending portion 11 </ b> B of the holding member 11. However, the blocking member 54 may be formed separately from the extending portion 11B and fixed directly to the frame side 5a via a bolt or the like.

  The blocking member 54 is formed so as not to contact the receiving plate 10 (that is, a gap exists between the lower end surfaces of the blocking piece pieces 54A and 54B and the upper surface of the receiving plate 10). . Further, the blocking member 54 is configured not to contact the base 52 (particularly, the receiving portion 52A and further the operating portion 52B) of the load cell 51A. Therefore, even if a force is applied to the blocking member 54 from the support shaft 62A, the force is not transmitted to the receiving portion 52A of the base 52 and further to the operating portion 52B.

  One end portion 62Aa of the first support shaft 62A that connects the first inclined movable arm 61Aa (61Ab) to the insertion space 54F between the pair of blocking portions 54A and 54B of the blocking member 54 on the upper surface of the receiving portion 52A. (62Ab) rolling elements 41 are inserted. Then, the first support shaft 62A is rolled onto the horizontal upper surface of the receiving portion 52A of the base 52 in a state where movement of the lower frame 5 in the length direction is blocked by the blocking portions 54A and 54B. It is mounted so as to be rotatable about the axis through the moving body 41.

  In the bed main body 1A incorporating the two pairs of load cells 51A and 51B as described above, the load from the bed surface forming unit 100 such as the bed 2 is transferred from the upper frame 3 of the lifting support mechanism 6 to the lifting support mechanism 6. Via each member (mainly the first and second upper frame intermediate bars 67A and 67B, the upper tilting arms 64Aa and 64Ab; 64Ba and 64Bb, the first intermediate connection shaft 65A and the second intermediate connection shaft 65B), 4 In addition to the two tilting movable arms 61Aa, 61Ab; 61Ba, 61Bb, the two ends 62Aa, 62Ab; 62Ba, 62Bb of the support shaft 62A and the support shaft 62B are added to the receiving portions 52A of the load cells 51A, 51B.

  FIG. 41 schematically shows the situation when a load is applied to the load cells 51A and 51B from the ends of the support shafts 62A and 62B in this way. FIG. 41 shows one end portion of the support shaft 62B that connects and supports the inclined movable arms 61Ba and 61Bb closer to the rear of the bed body among the four load cells 51A and 51B in total (the end portion on the inclined movable arm 61Ba side). ) Shows a situation in which a load G is applied from 62Ba to the receiving portion 52A of the load cell 51B via the receiving plate 10. In FIG. 41, a solid line indicates a situation before the load G is applied, and a two-dot chain line indicates a situation when the load G is applied.

  As shown in FIG. 41, the inclined movable arms 61Ba and 61Bb, the support shaft 62B, one end portion 62Ba of the support shaft 62B (the rolling element 41), and the receiving plate 10 are added to the receiving portion 52A of the load cell 51B. Due to the load, the receiving portion 52A of the load cell 51B is pushed downward. Accordingly, the distal end side (side closer to the receiving portion 52A) of the operating portion 52B continuing to the receiving portion 52A via the wall portion 52D is pushed downward. Since the rear end side (the side away from the receiving portion 52A) of the operating portion 52B is fixed to the frame side 5a of the lower frame 5 via the attachment portion 52C, the front end side bends in a direction lowering from the rear end side. Deformation and distortion will occur. Here, since the Roverval mechanism is formed by the hole portion 58 in the operating portion 52B, the deformation thereof is locally concentrated and expanded, and the resistance of the strain gauges R1, R2, R3, and R4 of the strain sensor 57 is increased. The voltage signal (distortion signal) corresponding to the magnitude of the distortion is generated by the Wheatstone bridge circuit.

Specifically, as shown in FIG. 41, strain gauges R1, R2, R3, R4 of the strain sensor 57 (only the strain gauges R3, R4 appear in FIG. 41) are attached to the upper surface side of the operating portion 52B. The tensile strain acts on the strain gauges R2 and R4 corresponding to the round hole 58a on the one end side (the side away from the receiving portion 52A) of the hole portion 58 in the operating portion 52B. Strain gauges corresponding to the round holes 58b on the side close to the portion 52A) Compressive strain acts on the R1 and R3, and the respective resistance values change. According to the Wheatstone bridge circuit shown in FIG. A voltage signal (distortion signal) is generated. Therefore, a signal corresponding to a change in load applied to the load cell 51A is output from the one end portion 62Ba of the support shaft 62B.
Although not shown in the drawing, the other three load cells 51A and 51B also output signals corresponding to changes in the load applied from the ends of the support shafts 62A and 62B, respectively.

  Thus, the load detector 50 including the load cells 51A and 51B in total of four locations can detect a change in the load applied to the bed surface forming unit 100 such as the bed 2.

  Here, depending on the position of the bed user or the like on the bed surface T of the bed main body 1A and its movement, a biased load may be applied to the bed surface forming portion 100 of the bed main body 1A. Specifically, a bed user, a visitor, a medical person, etc., sits at the end of the bed surface T, or a user who is sleeping on the bed surface T greatly turns over to the end side of the bed surface T. Or stand up, and the load applied to the bed surface forming part 100 may be greatly deviated (that is, an unbalanced load state may occur). In such an unbalanced load state, the loads applied to the four tilting movable arms 61Aa, 61Ab; 61Ba, 61Bb are not uniform, but four of the bed body 1A corresponding to each of the tilting movable arms 61Aa, 61Ab; 61Ba, 61Bb. By arranging load cells 51A and 51B in a total of four locations near the corners, the load applied to each tilting movable arm, that is, the load applied to each position near the four corners of the bed body can be individually detected, and Thus, it is possible to know whether the load is biased or the state of the user H on the bed surface T of the bed main body 1A. The specific usage of such a load detection signal will be described in detail later.

  Here, in the case of the present embodiment, both end portions 62Aa, 62Ab; 62Ba, 62Bb of the support shafts 62A, 62B, that is, the portions of the rolling elements 41 are in relation to the receiving portion 52A in the base body 52 of each load cell 51A, 51B. It is structurally separated and is not fixed or continuously integrated with the receiving portion 52A. That is, the rolling elements 41 of both end portions 62Aa and 62Ab; 62Ba and 62Bb of the support shafts 62A and 62B are rotatably mounted on the upper surface of the receiving portion 52A of the base 52 of each load cell 51A and 51B via the receiving plate 10. Therefore, both end portions 62Aa and 62Ab; 62Ba and 62Bb of the support shafts 62A and 62B are not fixed to the base 52.

  As described above, when an unbalanced load is applied to the bed surface forming portion 100 of the bed main body 1A, if the both end portions 62Aa, 62Ab; 62Ba, 62Bb of the support shafts 62A, 62B are fixed to the base 52, the support shaft 62A 62B, an upward force may be applied to the load cells 51A and 51B. In this case, the upward force is detected by the load cells 51A and 51B as an upward load in the vertical direction (that is, a negative load with respect to the downward load in the vertical direction to be detected originally), and an error with respect to the original load detection is large. There is concern about becoming.

  However, in the present embodiment, since both end portions 62Ba and 62Bb (the rolling element 41 portions) of the support shafts 62A and 62B and the base 52 of the load cells 51A and 51B are separated in the vertical direction, the support shafts 62A and 62B are separated from each other. Even if a vertical upward load (negative load) as described above is applied, the force is not transmitted to the base 52, and therefore the operating portion (cantilever portion) 52B of the base 52 is not bent. Only downward load can be detected with high accuracy.

  The blocking member 54 for blocking the movement of the first support shaft 62A near the front of the bed main body 1A is separated from the base 52 of the load cell 51A (particularly not in contact with the receiving portion 52A of the base 52). Even if a load component in a direction other than the vertically downward direction is applied to the blocking member 54 from the first support shaft 62A to the blocking member 54 due to a load, an impact, or the like, the load component is not applied to the receiving portion 52A of the base body 52. Even on the front side of the bed body 1A, only the downward load in the vertical direction can be detected with high accuracy.

  The receiving plate 10 in the load cells 51A and 51B is a portion that rotatably supports both end portions 62Ba and 62Bb of the support shafts 62A and 62B, that is, a portion that receives the rolling element 41. In order to smoothly perform the tilting operation, the rolling elements 41 of the support shafts 62A and 62B can be smoothly rotated (the tilting movable arms 61Aa and 61Ab; 61Ba and 61Bb can be smoothly tilted). It is desirable.

Also, here, if the resistance of the receiving plate 10 with respect to the support shafts 62A and 62B is large, there is a concern that a force in a direction deviating from the lower side in the vertical direction is applied to the receiving portion 52A from the support shafts 62A and 62B via the receiving plate 10. In that case, the accuracy of the original load detection may be reduced. From these viewpoints, it is desirable that the frictional resistance between the end portions 62Aa and 62Ab; 62Ba and 62Bb of the support shafts 62A and 62B and the receiving plate 10 be as small as possible.

Therefore, also in this embodiment, both end portions 62Aa and 62Ab; 62Ba and 62Bb of the support shafts 62A and 62B. A rolling element 41 that is rotatable relative to the support shafts 62A and 62B is provided around the center axis (rotation axis) of the support shafts 62A and 62B. Further, in that case, at least one of the outer peripheral surface of the rolling elements 41 of the both end portions 62Aa, 62Ab; 62Ba, 62Bb and the upper surface of the receiving plate 10 of the support shafts 62A, 62B is finished to a smooth surface (for example, a mirror surface). It is desirable to keep it. In some cases, at least one of these surfaces may be subjected to a surface treatment for reducing frictional resistance, or a low friction (solid lubricity) film such as a fluorine resin coating.

  In any case, the lower end portion (support shafts 62A, 62B) of the elevating support mechanism 6 and the receiving portion 52A of the base 52 in the load cells 51A, 51B are not fixed (that is, separated and independent) and supported. Both end portions 62Aa, 62Ab; 62Ba, 62Bb of the shafts 62A, 62B are in contact with the receiving portion 52A of the base 52 in the vertical direction, so that only the load component in the vertically downward direction is applied to the base 52. The load cells 51A and 51B are interposed between the lower end portions (support shafts 62A and 62B) of the elevating support mechanism 6 and the lower frame 5 (frame side 5a). The configuration of the lower frame 5 may be substantially the same as when the load cells 51A and 51B are not interposed. This means that load cells 51A and 51B can be easily incorporated into a commercially available bed that does not have a load detection function (a bed that is not provided with load cells 51A and 51B), and the load detection function is easy. It can be added to.

[Eighth example of load cell]
Next, an eighth example of the load cell will be described with reference to FIGS.
As shown in FIGS. 42 to 46, in the eighth example, the load cells 51A and 51B constitute a base group 22 including two base bodies (first base body 22L and second base body 22R), respectively. Further, the base of the eighth example (first base 22L, second base 22R) differs from the base 52 of the seventh example in the configuration of the receiving portion 22A.
The first base 22L and the second base 22R can be made of the same material as the base 52 in the above-described examples.

FIG. 42 shows the base body group 22 and a pair of strain sensors 57 and 57 attached to the base body group 22 in the load cell 51B of the eighth example, and FIGS. 43 to 45 show the load cell 51B as the bed body. An assembled state, that is, a state in which the load cell 51B is attached to the frame side 5a of the lower frame 5 and the load cell 51B receives (supports) one end portion 62Ba of the support shaft 62B is shown.
In addition, about the component of the same aspect as each example already demonstrated, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 42, the first base body 22L and the second base body 22R are arranged at a predetermined interval along the length direction of the frame side 5a. The first base body 22L and the second base body 22R receive the one end portion 62Ba (62Bb) of the support shaft 62B, respectively, and the receiving portion 22A to which the load from the support shaft 62B acts and the receiving portion 22A are integrally continuous. The operation portion 22B is distorted and deformed by a load applied to the receiving portion 22A, and the attachment portion 22C is integrally and continuously attached to the operation portion 22B and is fixed to the frame side 5a of the lower frame 5 in the bed main body 1A. ing.

  The receiving portion 22A is a portion protruding upward from the upper surface 22Ba of the operating portion 22B. That is, the receiving portion 22A is formed so as to protrude upward from the center near the end on the opposite side of the mounting portion 22C on the upper surface 22Ba. The receiving plate 10 is placed on the upper surface of the receiving portion 22A, and one end portion 62Ba (62Bb) of the support shaft 62B is mounted on the receiving plate 10 to transmit the load from the support shaft 62B to the operating portion 22B.

In this way, by forming the receiving portion 22A so as to protrude upward from the upper surface 22Ba of the operating portion 22B, the base body (first base body 22L, second base body 22R) is greatly protruded inward of the lower frame 5. There is no need. Thereby, a more compact load cell 51B can be configured. Accordingly, the load cells 51A and 51B can be more easily incorporated into a commercially available bed that does not have a load detection function (a bed without the load cells 51A and 51B), and the load detection function can be added.
In this example, the receiving portion 22A protrudes in a rectangular shape as shown in FIG. However, it is not limited to such a shape. For example, it may be formed so as to protrude in a hemispherical shape from the upper surface 22Ba of the operating portion 22B.

A strain sensor 57 is attached to the upper surface 22Ba of the operating portion 22B.
In this example, the shape of the attachment portion 22C of the first base 22L and the second base 22R is reversed left and right, but this is not restrictive, and the first base 22L and the second base 22R are The same shape can be used.

  As shown in FIGS. 43 to 45, the receiving plate 10 having the same mode as the seventh example is placed on the receiving portions 22A and 22A of the first base 22L and the second base 22R so as to bridge them. Has been. Further, one end portion 62Ba (62Bb) of the support shaft 62B is mounted on the receiving plate 10, and the load from the support shaft 62B is transmitted to the receiving portion 22A.

  Similarly to the seventh example, a holding member 11 is attached above the receiving plate 10, and two suspension shafts 12 and 12 are suspended from the extending portion 11 </ b> B of the holding member 11. It has been. The suspension shaft 12 is inserted with play through insertion holes 10a provided in the vicinity of both ends in the longitudinal direction of the receiving plate 10, and a stopper 13 is attached to the tip of the insertion.

In the load cell 51B shown in this example, the base group 22 includes a first base body 22L and a second base body 22R that are formed separately from each other, and a receiving plate that bridges between the receiving portions 22A and 22A. 10 is placed. A strain sensor 57 is attached to each of the first base 22L and the second base 22R.
With this configuration, it is possible to completely prevent the deformation of one base (for example, the first base 22L) from affecting the strain sensor 57 of the other base (for example, the second base 22R).

  In the case where the base body is not a separate body (for example, the base body 52 of the above-described eighth example), even if the receiving plate 10 is interposed, it depends on the position of the one end portion 62Ba (62Bb) of the support shaft 62B. There is a possibility that the deformation of the base body itself (that is, the deformation in the length direction with respect to the frame side 5a of the operating portion) becomes non-uniform and the base body is not completely twisted. In this case, the strain sensor 57 may detect strain due to the twist, and the load detection accuracy may be reduced.

  However, as shown in this example, the base body group 22 is configured by the first base body 22L and the second base body 22R which are separate from each other, and the strain sensors 57 and 57 are attached to the base body group 22L and the second base body 22R, respectively. Since the bases (the first base body 22L and the second base body 22R) to which are attached are deformed independently, the influence of the twist described above can be completely eliminated.

The strain sensors 57 and 57 attached to the operating portions 22B and 22B of the first base 22L and the second base 22R, respectively, can sum or average their outputs to obtain an overall output. As a result, errors due to individual differences in noise and strain gauges can be removed to enable more accurate measurement.
In addition, the balance of the load applied to the first base 22L and the second base 22R can be known by separately measuring the outputs of the respective strain sensors 57 and comparing them. That is, it is possible to know at which position the one end portion 62Ba of the support shaft 62B is disposed along the longitudinal direction of the receiving plate 10. Furthermore, the position of the center of gravity of the user H (see FIG. 1) of the bed surface T can be calculated using the absolute value of each strain sensor 57 and the load balance.

The configuration of the load cell 51A on the front side of the bed body (support axis linear movement blocking side) used in combination with the load cell 51B of the eighth example on the back side of the bed body (support axis linear movement allowable side) as described above is particularly special. Although not limited, it is desirable to have the same configuration as the load cell 51B of the eighth example. Furthermore, the movement of the support shaft 62A can be blocked by a method such as attaching a blocking member similar to the blocking member 54 (see FIGS. 39 and 40) already described.
As shown in FIG. 46, the tip of one end portion 62Aa (62Ab) of the support shaft 62A is inserted into the space 22M between the first base 22L and the second base 22R to prevent the support shaft 62A from moving. You may comprise as follows.

[Ninth example of load cell]
Next, a ninth example of the pair of load cells 51B on the second support shaft 62B (support shaft on the side that allows movement (the rear side of the bed body)) and the attached state thereof will be described with reference to FIGS. I will explain.
Note that the pair of left and right load cells 51B and their attachment and support are symmetrical on the left and right sides of the bed body. FIGS. 47 to 50 show load cells on one side (for example, the left side) of the pair of left and right load cells 51B. Only 51B is shown.

47 mainly shows a base 52 and a pair of strain sensors 57 attached to the base 52 in the load cell 51B of the ninth example, and the load cell 51B is incorporated in the bed body in FIGS. A state where the load cell 51B is attached to the frame side 5a of the lower frame 5 and the load cell 51B receives (supports) the rolling element 41 of the one end portion 62Ba of the second support shaft 62B is shown. The load cell 51B shown in FIGS. 48 to 50 is configured to include a pedestal member 32, a base 52, a strain sensor 57, and a receiving member 30. Further, an upper plate member 31 is disposed at a position where the load cell 51B is attached to the frame side 5a.
Here, the frame side 5a of the lower frame 5 is made of a rectangular tube, and its cross section has a substantially rectangular shape. The frame side 5a is provided in parallel to the installation surface B (see FIG. 1).

  As shown in FIG. 47, the base 52 receives the rolling element 41 of the one end portion 62Ba (62Bb) of the second support shaft 62B and receives a receiving portion 52A on which a load from the second support shaft 62B acts, The structure includes an operating part 52B that is integrally and continuously connected to the receiving part 52A, and that is deformed and deformed by a load applied to the receiving part 52A, and an attachment part 52C that is integrally and continuously attached to the operating part 52B. ing.

In this example, the operating portion 52B of the base 52 has a longitudinal direction (a direction connecting an end on the side continuous with the receiving portion 52A and an end on the side continuous with the mounting portion 52C) in the length direction of the frame side 5a. (In order to extend in the X direction in FIG. 47). Further, the base 52 is provided with a hole 58 constituting a Roverval mechanism in the operating part 52B. The hole 58 of the operating portion 52B penetrates in the direction (Y direction) orthogonal to the length direction of the frame side 5a.
A strain sensor 57 is affixed to the upper surface of the operating portion 52B of the base 52. The strain sensor 57 includes four strain gauges R1, R2, R3, and R4 (strain sensitive resistors), and can detect strain deformation of the operating portion 52B.

  The receiving member 30 is attached to the receiving portion 52 </ b> A of the base 52. The receiving member 30 is a block member made of, for example, a rectangular bar-like rigid body that extends along the length direction of the frame side 5a (the X direction in FIG. 47). Further, the receiving member 30 is formed with a through hole 30b that penetrates in the vertical direction and has a spot facing portion. The receiving member 30 is fixed to the mounting hole 52Aa of the receiving portion 52A by a bolt 33 passing through the through hole 30b. On the upper surface of the receiving member 30, a horizontal (parallel to the XY plane) placement surface 30a is formed for placing and rolling the rolling element 41 of the one end portion 62Ba of the second support shaft 62B. Yes.

  The rolling element 41 of one end portion 62Ba of the second support shaft 62B is placed on the mounting surface 30a of the receiving member 30, and the second support shaft 62B rolls in the longitudinal direction (X direction) of the receiving member 30. It can move. That is, the receiving member 30 can rotatably support the one end portion 62Ba (62Bb) of the second support shaft 62B while allowing the frame side 5a to move in the length direction.

If a load is applied in a state where the one end portion 62Ba (rolling element 41) of the second support shaft 62B is mounted on the mounting surface 30a of the receiving member 30, the base 52 is deformed according to the load from the second support shaft 62B. . Since the base body 52 is provided with a robust mechanism, the operating portion 52B is deformed. By detecting the amount of deformation by the strain sensor 57, the load from the second support shaft 62B can be measured.
As the receiving member 30, it is desirable to apply a material having high rigidity so that deformation does not occur. Further, it is desirable that the receiving member 30 has a cross-sectional shape in which bending deformation is unlikely to occur even when the second support shaft 62B is moved near the longitudinal end of the placement surface 30a.
The receiving member 30 may be configured integrally with the base body 52. In this case, the rigidity in the vicinity of the boundary between the receiving member 30 and the receiving portion 52A of the base 52 is increased, which is more preferable.

As shown in FIGS. 48 to 50, the base 52 is attached to the base member 32.
The pedestal member 32 is fixed to the frame side 5a and extends in the vertical direction (Z direction in FIGS. 48 to 50), and a pedestal portion 32B (pedestal) that is bent from the lower end of the mounting portion 32A and extends in the horizontal direction. Consists of. A base 52 is fixed to the upper surface 32Ba of the pedestal portion 32B (pedestal). An attachment hole 52Ca having a counterbore portion and penetrating in the vertical direction (Z direction) is provided in the attachment portion 52C of the base 52, and the base 52 is mounted on the base member by the bolt 34 through the attachment hole 52Ca. It is fixed to 32 pedestals 32B.

  An upper plate member 31 is attached above the receiving member 30. The upper plate member 31 includes an attachment portion 31A that extends in the vertical direction and is fixed to the frame side 5a, an upper plate portion 31B (upper plate) that is bent from the lower end of the attachment portion 31A and extends in the horizontal direction, and both sides of the upper plate portion 31B. And a pair of dropout prevention portions 31C (dropout prevention members) that are bent from the top and extend vertically downward.

The upper plate portion 31B is disposed above the rolling elements 41 of the one end portion 62Ba (62Bb) of the second support shaft 62B via a gap, and extends in the length direction (X direction) of the frame side 5a. The rolling element 41 of the one end portion 62Ba (62Bb) of the second support shaft 62B is interposed between the receiving member 30 and the upper plate portion 31B and can move in the length direction (X direction) of the frame side 5a.
As shown in FIG. 50, the second support shaft 62B of this example has a large-diameter portion 62Bc having a diameter larger than the outer diameter of the rolling element 41 of the one end portion 62Ba (62Bb). . The large diameter portion 62Bc is formed between both end portions 62Ba and 62Bb of the second support shaft 62B (between the two rolling elements 41). The edge portion of the upper plate portion 31B and the large diameter portion 62Bc are adjacent to each other via a gap 35 in the Y direction (extending direction of the support shaft 62B).

The second support shaft 62B has a large-diameter portion 62Bc, and the large-diameter portion 62Bc and the upper plate portion 31B are disposed adjacent to each other with the gap 35 therebetween, so that one end portion 62Ba of the second support shaft 62B is When trying to meander and move relative to the receiving member 30, the large diameter portion interferes with the upper plate portion 31B. Thereby, it can suppress that one end part 62Ba (62Bb) meanders. Therefore, it is possible to prevent the one end portion 62Ba (62Bb) of the second support shaft 62B from being detached from the receiving member 30.
The Y-direction gap 35 between the large-diameter portion 62B and the upper plate portion 31B is preferably 0.5 mm or more and 5 mm or less. By comprising in this way, meandering movement can be suppressed effectively, operating the 2nd support shaft 62B smoothly.

  Further, the upper plate portion 31B also plays a role of preventing the one end portion 62Ba of the second support shaft 62B from jumping out from above the moving region and derailing. For example, when the user H shown in FIG. 1 is sitting at the corner of the bed surface T of the bed 1, local stress is applied to the bed surface T. At this time, the one end portion 62Ba (or one end portion 62Bb) of the second support shaft 62B may be lifted. Since the upper plate portion 31B is provided, even if the one end portion 62Ba (62Bb) is lifted, it interferes with the upper plate portion 31B, so that the one end portion 62Ba (62Bb) is not removed.

  The upper plate member 31 is provided with a drop-off preventing portion 31C formed by bending both ends in the longitudinal direction (X direction) of the upper plate portion 31B vertically downward. The drop-off prevention part 31C limits the operation range of the second support shaft 62B that rolls on the placement surface 30a of the receiving member 30, and prevents the drop-off prevention unit 31C from dropping from the placement surface 30a. That is, even if the second support shaft 62B rolls (moves) along the length direction of the frame side 5a and tries to exceed the longitudinal end portion of the receiving member 30, the drop-off prevention portion 31C is The shaft 62B interferes with the rolling element 41 of the one end portion 62Ba (62Bb) to prevent the shaft 62B from dropping off.

The drop-off prevention part 31 </ b> C is attached to the frame side 5 a so as not to contact the receiving member 30 and the base 52. Therefore, even if a force is applied to the drop-off preventing portion 31C from the second support shaft 62B, the force is not transmitted to the receiving portion 52A of the base 52 and further to the operating portion 52B. As a result, even if a force is applied from the second support shaft 62B to the drop-off preventing portion 31C, this force is not transmitted to the operating portion 52B of the base 52, and the strain sensor 57 attached to the operating portion 52B measures an accurate load. it can.
The configuration of the dropout prevention unit 31C is not limited to this example. The drop-off prevention part 31C may not be in contact with the members constituting the load transmission path from the second support shaft 62B to the base 52, and the receiving part 52A and the operating part 52B of the base 52.

As shown in FIG. 50, the pedestal member 32 has its attachment portion 32A in surface contact with the inner side surface 5ab of the frame side 5a (the side surface corresponding to the inside of the rectangular lower frame 5), and the pedestal portion 32B It arrange | positions so that it may extend inside the lower frame 5. FIG. Further, the upper plate member 31 is disposed such that the attachment portion 31 </ b> A is in surface contact with the attachment portion 32 </ b> A of the base member 32, and the upper plate portion 31 </ b> B extends to the inside of the lower frame 5.
The pedestal member 32 and the upper plate member 31 are fixed to the attachment hole 32Aa provided in the attachment portion 32A of the pedestal member 32, the attachment hole 31Aa provided in the attachment portion 31A of the upper plate member 31, and the frame side 5a. The bolt 53 is inserted into the hole (not shown), and the bolt 53 is screwed to a contact plate 53A provided inside the frame side 5a. By screwing to the contact plate 53A, it is possible to fix the plate more firmly.
The attachment hole 32Aa provided in the attachment portion 32A of the base member 32 is a long hole whose longitudinal direction is the vertical direction (Z direction). Therefore, the mounting height of the base member 32 can be easily adjusted by changing the position at which the bolt 53 is fixed in the mounting hole 32Aa (long hole).

As shown in FIG. 49, a gap e is formed in the vertical direction (Z direction) between the receiving member 30 and the mounting portion 52C of the base 52. Similarly, a gap e is formed between the receiving portion 52 </ b> A of the base 52 and the pedestal portion 32 </ b> B of the pedestal member 32.
By forming such gaps e and e, it is possible to secure a stroke for the operating portion 52B to deform and the receiving portion 52A and the receiving member 30 to sink.

The receiving portion 52A of the base 52 sinks due to distortion deformation in the operating portion 52B. When the subsidence exceeds a predetermined value (hereinafter referred to as a limit subsidence amount) depending on the shape and material of the base 52, the base 52 is damaged. More specifically, the base 52 yields.
The gaps e and e are formed narrower than the limit sinking amount. Therefore, when a load causing damage to the base 52 (hereinafter referred to as an overload) is applied to the receiving portion 52A of the base 52 via the receiving member 30, the receiving member 30 and the base 52, or the base 52 and the base member 32. The pedestal 32B interferes. Thereby, it can suppress that an overload is added to the receiving part 52A of the base | substrate 52, and can suppress the damage | damage of the base | substrate 52. FIG.

Next, a ninth example of the pair of load cells 51A on the first support shaft 62A (support shaft on the side that suppresses movement (front side of the bed main body)) and the attached state thereof will be described with reference to FIG. The load cell 51A (first support shaft 62A side) is similar to the load cell 51B (second support shaft 62B side) described above, and the base 52 having the receiving portion 52A, the operating portion 52B, and the mounting portion 52C, and its operation The strain sensor 57 is affixed to the portion 52B. The specific configurations of the base body 52 and the strain sensor 57 in the load cell 51A may be the same as those of the load cell 51B described above, and therefore the details thereof are omitted here.
Unlike the load cell 51B (second support shaft 62B side), the load cell 51A (first support shaft 62A side) is provided with a blocking member 54 instead of the upper plate member 31. Further, the receiving member 30 of the load cell 51A (first support shaft 62A side) is formed shorter than the receiving member 30 of the load cell 51B (second support shaft 62B side).

The blocking member 54 is attached to the frame side 5 a by a bolt 53 together with the base member 32. The blocking member 54 is a pair of blocking portions disposed above the receiving member 30 at a distance equivalent to (or slightly larger than) the outer diameter of the rolling element 41 of the one end portion 62Aa of the first support shaft 62A. 54A and 54B are provided, and the insertion space 54F into which the rolling element 41 of the one end portion 62Aa of the first support shaft 62A is inserted may be formed between the pair of blocking portions 54A and 54B.
The specific configuration of the blocking member 54 other than these points is not particularly limited. However, in the case of the present embodiment, the upper ends of a pair of rectangular bar-shaped blocking portions 54A and 54B along the vertical direction are integrally connected by a connecting piece 54C. Then, the connecting piece 54C is extended toward the frame side 5a of the lower frame 5, and the inner side surface of the frame side 5a (corresponding to the inner side of the rectangular lower frame 5 is formed at the tip of the extension portion 54D. A mounting portion 54E that contacts 5ab is formed, and the mounting portion 54E is fixed to the side surface 5ab inside the frame side 5a by a bolt 53.
The connecting piece 54C is located above the rolling element 41 of the one end portion 62Aa (62Ab) of the first support shaft 62A, and the one end portion 62Aa (62Ab) of the first support shaft 62A is located above the moving region. It also plays a role in preventing jumping out of the wheel.

  The blocking member 54 is attached to the frame side 5 a so as not to contact the receiving member 30 and the base 52. Therefore, even if a force is applied to the blocking member 54 from the first support shaft 62A, the force is not transmitted to the receiving portion 52A of the base 52 and further to the operating portion 52B. Thereby, even if a force is applied to the blocking member 54 from the first support shaft 62A, this force is not transmitted to the operating portion 52B of the base 52, and the strain sensor 57 attached to the operating portion 52B applies an accurate load. It can be measured.

The configuration of the blocking member 54 is not limited to this example. The blocking member 54 may not be in contact with the member constituting the load transmission path from the first support shaft 62A to the base 52, and the receiving portion 52A and the operating portion 52B of the base 52.
Further, the gap between the connecting piece 54C and the receiving member 30 is maintained so that a gap is maintained between the connecting piece 54C at the top of the blocking member 54 and the upper portion of the outer peripheral surface of the one end portion 62Aa of the first support shaft 62A. The distance is determined.

  The rolling element 41 of one end portion 62Aa (62Ab) of the first support shaft 62A that connects the first inclined movable arm 61Aa (61Ab) is inserted into the insertion space 54F between the pair of blocking portions 54A, 54B of the blocking member 54. Is done. Then, the rolling element 41 of the first support shaft 62A is in a state where the movement of the frame 5a of the lower frame 5 in the length direction is blocked by the blocking portions 54A and 54B, and the horizontal portion of the receiving portion 52A of the base 52 is blocked. It is mounted on the upper surface so as to be rotatable about the axis.

  In the bed main body 1A incorporating the two pairs of load cells 51A and 51B as described above, the load from the bed surface forming unit 100 such as the bed 2 is transferred from the upper frame 3 of the lifting support mechanism 6 to the lifting support mechanism 6. Through each member, the four tilting movable arms (the first tilting movable arms 61Aa and 61Ab, the second tilting movable arms 61Ba and 61Bb are added, and each of the first support shaft 62A and the second support shaft 62B is added. Both end portions 62Aa, 62Ab; 62Ba, 62Bb (rolling elements 41) are transmitted to the respective base bodies 52 of the load cells 51A, 51B. Due to this load, the operating portion 52B of the base body 52 is deformed, and the deformation amount is detected by the strain sensor 57. The load applied to each load cell 51A, 51B can be calculated.

The base 52 of the load cells 51A and 51B in this example is provided with a hole 58 that constitutes a Roverval mechanism in the operating part 52B. In this example, the hole 58 penetrates in a direction (Y direction) orthogonal to the length direction of the frame side 5a. A receiving member 30 extending in the length direction of the frame side 5a is attached to the receiving portion 52A of the base 52.
By comprising in this way, the load which adds the twist to the action | operation part 52B with respect to the extension direction of the action | operation part 52B of the base | substrate 52 is not added. Therefore, the strain sensor 57 can detect an accurate strain. Further, since there is no twist as described above, it is not necessary to attach a plurality of strain sensors 57. Therefore, the circuit for processing the output from the strain sensor 57 can be simplified, and the substrate can be manufactured at low cost.

  By the way, when the extending direction of the operation part 52B of the load cells 51A and 51B is orthogonal to the length direction of the frame side 5A (the first to eighth examples described above), in other words, the Roverval mechanism in the operation part 52B is changed. In the case where the hole portion 58 to be configured is formed so as to penetrate in a direction orthogonal to the length direction of the frame side 5a, if the operation portion 52B is to be elongated, It is necessary to shorten the support shafts 62A and 62B. Therefore, when the load cells 51A and 51B are attached to a commercially available bed (the bed in which the load cells 51A and 51B are not provided) in which the lengths of the support shafts 62A and 62B are predetermined, the length of the operating portion 52B is limited. It was. Here, it is known that the load detection accuracy decreases if the length of the operating portion 52B is short.

  On the other hand, in the operation part 52B of this example, the extending direction thereof coincides with the length direction of the frame side 5a (all in the X direction). In other words, the hole 58 for constituting the Roverval mechanism in the operating portion 52B is formed with a directivity that penetrates in a direction parallel to the length direction of the frame side 5a. Therefore, even if the operating portion 52B has a sufficient length in the longitudinal direction, there is no need to change the lengths of the first and second support shafts 62A and 62B, and a commercially available bed that does not have a load detection function ( The load cells 51A and 51B can be easily incorporated into the bed) in which the load cells 51A and 51B are not provided. Moreover, there is no restriction | limiting in the length of the action | operation part 52B, and in order to acquire sufficient measurement accuracy, the action | operation part 52B can be lengthened.

[Tenth example of load cell]
Next, a tenth example of the pair of load cells 51B on the second support shaft 62B (support shaft on the side that allows movement (the rear side of the bed body)) and its attached state will be described with reference to FIG. . The load cell 51B is different from the ninth example in the configuration of a drop-off prevention member (corresponding to the drop-off prevention part 31C in the ninth example).

In the load cell 51B of this example shown in FIG. 52, a pair of drop-off prevention members 36 are attached to the pedestal portion 32B of the pedestal member 32 by bolts 37, and extend upward in the vertical direction (Z direction in FIG. 52).
The dropout prevention member 36 is formed in a plate shape having a stepped portion 36a. The dropout prevention member 36 includes a thick plate-like fixing portion 36A with the stepped portion 36a as a boundary, and a dropout prevention portion 36B formed thinner than the fixing portion 36A. A screw hole (not shown) is provided on the end face of the drop-off prevention member 36 on the fixed portion 36A side, and the bolt-off prevention member 36 is screwed into the screw hole via the pedestal portion 32B. It is fixed to 32B. By being fixed in this way, the drop-off prevention member 36 extends upward and stands upright.

  The drop-off prevention member 36 extending upward is disposed on both sides of the movement range (the frame side 5a length direction (X direction)) of the one end portion 62Ba (62Bb) of the second support shaft 62B. Thereby, the drop-off prevention member 36 limits the operating range of the second support shaft 62B that rolls on the placement surface 30a of the receiving member 30 via the rolling element 41 of the one end portion 62Ba (62Bb). It is prevented from dropping off from the surface 30a. That is, even if the rolling element 41 of the second support shaft 62B rolls (moves) along the length direction of the frame side 5a and exceeds the longitudinal end portion of the receiving member 30, the drop-off prevention member 36 The second support shaft 62B can interfere with the rolling element 41 of the one end portion 62Ba (62Bb) to prevent the dropout.

  Note that the drop-off prevention member 36 is not limited to the plate material fixed to the pedestal portion 32B of the pedestal member 32. For example, it may be made of a round bar and may be formed so as to protrude from the attachment portion 32A of the base member 32 in the Y direction. Further, it may be formed integrally with the base member 32.

  The step portion 36 a of the dropout prevention member 36 is formed below the receiving member 30. Further, a dropout prevention portion 36B that is formed thin is formed above the step portion 36a. The drop-off prevention part 36B is arranged so as to avoid contact with the receiving member 30. Therefore, even if a force is applied to the drop-off preventing portion 36B from the second support shaft 62B, the force is not transmitted to the receiving portion 52A of the base 52, and further to the operating portion 52B. As a result, even if a force is applied to the drop-off prevention member 36 from the second support shaft 62B, the force is not transmitted to the operating portion 52B of the base 52, and the strain sensor 57 attached to the operating portion 52B measures an accurate load. it can.

  Next, a tenth example of the pair of load cells 51A on the first support shaft 62A (the support shaft on the side (the front side of the bed main body) that suppresses movement) and its attached state will be described with reference to FIG. The load cell 51A is different in the configuration of the blocking member 54 from the ninth example.

  The load cell 51A of this example shown in FIG. The blocking member 54 includes a first blocking piece member 38 and a second blocking piece member 39 that are attached to the pedestal portion 32B of the pedestal member 32 with bolts 37 and extend upward in the vertical direction (Z direction in FIG. 52).

  The first blocking piece member 38 is formed in a plate shape having a stepped portion 38a. The first blocking piece member 38 includes a thick plate-shaped fixing portion 38A with a stepped portion 38a as a boundary, and a blocking portion 38B formed thinner than the fixing portion 38A. A screw hole (not shown) is provided on the end face of the first blocking piece member 38 on the fixed portion 38A side, and the first blocking piece member is screwed into the screw hole via the base portion 32B. 38 is being fixed to the base part 32B. By being fixed in this way, the drop-off prevention member 36 extends upward and stands upright.

The second blocking piece member 39 is a plate formed in a crank shape when viewed from the front, and includes a fixing portion 39A and a blocking portion 39C extending in the vertical direction (Z direction), and a blocking portion 39A extending in the horizontal direction (X direction). The bridge portion 39B connects the pieces 39C.
A screw hole (not shown) is provided in the lower end surface of the fixing portion 39A, and the second blocking piece member 39 is mounted on the base portion 32B by screwing a bolt 37 into the screw hole via the base portion 32B. It is fixed to.
The blocking portion 39C is disposed on the side portion of the one end portion 62Aa of the first support shaft 62A. Further, the blocking portions 39C are arranged on both sides in the movement direction (X direction) so as to block the movement of the one end portion 62Aa of the first support shaft 62A together with the blocking portion 38B of the first blocking piece member 38.
More specifically, the blocking portion 38B of the first blocking piece member 38 and the blocking portion 39C of the second blocking piece member 39 are equivalent to the outer diameter of the rolling element 41 of the one end portion 62Aa of the first support shaft 62A (or Slightly spaced apart). An insertion space 54F into which the rolling element 41 of the one end portion 62Aa of the first support shaft 62A is inserted is formed between the blocking portions 38B and 39C.
The blocking member 54 (the first blocking piece member 38 and the second blocking piece member 39) is attached to the frame side 5a so as not to contact the receiving member 30 and the base 52. Therefore, even if a force is applied to the blocking member 54 from the first support shaft 62A, the force is not transmitted to the receiving portion 52A of the base 52 and further to the operating portion 52B. Thereby, even if a force is applied to the blocking member 54 from the first support shaft 62A, this force is not transmitted to the operating portion 52B of the base 52, and the strain sensor 57 attached to the operating portion 52B applies an accurate load. It can be measured.

An upper plate member 40 is provided above the rolling element 41 of the one end portion 62Aa (62Ab) of the first support shaft 62A. The upper plate member 40 includes an attachment portion 40A that extends in the vertical direction and is fixed to the frame side 5a, and an upper plate portion 40B (upper plate) that is bent from the lower end of the attachment portion 40A and extends in the horizontal direction.
The upper plate portion 40B is disposed above the one end portion 62Aa (62Ab) of the first support shaft 62A, and the one end portion 62Aa (62Ab) of the first support shaft 62A, that is, the portion of the rolling element 41 moves. It plays the role of preventing jumping out of the area and escaping. The gap between the upper plate portion 40B and the receiving member 30 is maintained so that a gap is maintained between the upper plate portion 40B and the upper portion of the outer peripheral surface of the rolling element 41 of the one end portion 62Aa of the first support shaft 62A. The distance is determined.

[Eleventh example of load cell]
Next, an eleventh example of the pair of load cells 51B on the second support shaft 62B (support shaft on the side that allows movement (the rear side of the bed body)) and the attached state thereof will be described with reference to FIGS. I will explain. The load cell 51B is mainly different from the ninth example in the configuration of the receiving member 30 and the one end portion 62Ba (62Bb) of the second support shaft 62B.

In the eleventh example, one end portion 62Ba (62Bb) of the second support shaft 62B is provided with a rolling element 41 as in the above examples. Unlike the above, it has a tooth surface 41a along the axial direction. That is, the rolling element 41 of the eleventh example is formed in a gear shape. The receiving member 30 of the load cell 51B of this example is a rack gear whose mounting surface 30a has a tooth surface 30c in the Y direction.
Formed on the tooth surface 41a of the rolling element 41 and the mounting surface 30a, the tooth surface 30c is formed to be engageable. That is, when the one end portion 62Ba (62Bb) of the second support shaft 62B moves on the receiving member 30, the tooth surfaces 30c of the rolling element 41 of the one end portion 62Ba (62Bb) and the mounting surface 30a of the receiving member 30 are mutually connected. The rolling element 41 moves on the mounting surface 30a while engaging 41a.

  Since the tooth surfaces 30c and 41a are engaged with each other, the second support shaft 62B is maintained orthogonal to the longitudinal direction (Y direction) of the receiving member 30. That is, the state where the second support shaft 62B is always perpendicular to the length direction of the frame side 5a is always maintained, and the second support shaft 62B does not meander and move. Therefore, it is possible to suppress the one end portion 62Ba (62Bb) of the second support shaft 62B from being detached from the receiving member 30.

Note that spur gears, helical gears, helical gears, and the like may be applied as the types of gears formed on the peripheral surface of the rolling element 41. In particular, when a helical gear is applied, the inclined directions of the tooth surfaces provided on the rolling elements 41 of both end portions 62Ba and 62Bb of the second support shaft 62B are opposite to each other so that the stress in the thrust direction is canceled out. It is preferable to configure.
Further, the surface shape of the tooth surface 41a of the rolling element 41 may be a linear shape or an involute curve as seen in a cross section orthogonal to the axis of the rolling element 41.

  The first support shaft 62A (used in combination with the load cell 51B of the eleventh example of the second support shaft 62B (support shaft on the side allowing movement (the rear side of the bed body)) as described above. The configuration of the load cell 51A on the side that prevents movement (the support shaft on the rear side of the bed main body) is not particularly limited, but is preferably the same configuration as the load cell 51B of the eleventh example. Then, a blocking member similar to the blocking member 54 described above (for example, see FIG. 51) may be attached so as to block the movement of the first support shaft 62A.

[Other aspects]
The load cells 51 </ b> A and 51 </ b> B in the above examples are attached to the inner side surface 5 ab of the frame side 5 a of the lower frame 5 (side surface corresponding to the inside of the rectangular lower frame 5). However, the load cells 51A and 51B may be attached to any of the outer side surface, upper surface, and lower surface of the frame side 5a.

  In the load cells 51A and 51B of the above examples, the strain sensors R1, R2, R3, and R4 are used as the strain sensors 57 that detect the magnitude of strain. The strain sensor is not limited to a conductive elastomer sensor, an optical strain sensor, an electrostrictive device sensor, a piezoelectric device sensor, a magnetostrictive device sensor, or the like.

  Further, in each of the above-described examples, the lower end portions of the respective tilting movable arms 61Aa, 61Ab; 61Ba, 61Bb in the lifting support mechanism 6 for lifting the bed surface forming portion 100 are respectively connected to the first and second support shafts 62A, The first and second support shafts 62A and 62B are fixedly attached to 62B and supported by the load cells 51A and 51B attached to the frame side 5a of the lower frame 5 so as to be rotatable about the shaft center. However, in some cases, the lower end portions of the respective tilting movable arms 61Aa, 61Ab; 61Ba, 61Bb are attached to the first and second support shafts 62A, 62B so as to be rotatable (tiltable), respectively. The two support shafts 62A and 62B themselves may be configured not to rotate.

  Furthermore, in this invention, as the raising / lowering support mechanism 6 for raising / lowering the bed surface formation part 100, not only the example shown in FIGS. 1-7 but other various pantograph systems and various link mechanisms can also be applied. it can. That is, the elevating support mechanism 6 extends between the lower frame and the bed surface forming portion so as to incline in directions opposite to each other within a vertical plane parallel to the length direction of the frame side, and the load from the bed surface forming portion. Are attached to the lower end of each of the first tilt movable arm and the first tilt movable arm, the axis direction being orthogonal to the length direction of the frame side, The first support shaft that is prevented from moving in the length direction and the lower end of the second inclined movable arm are attached away from the first support shaft in the length direction of the frame side, and the axial direction is A second support shaft that is orthogonal to the frame side length direction and is allowed to move in the frame side length direction; and a drive mechanism that changes the tilt angle of the first and second tilting movable arms. Therefore, it is not limited to the elevating support mechanism 6 as shown in FIGS. The shown, it may be a vertical movement support mechanism 6 of a so-called pantograph type.

  Also in the case of the lifting support mechanism 6 as shown in FIG. 56, both end portions of the support shafts 62A and 62B that connect the lower ends of the tilting movable arms 61Aa and 61Ab; 61Ba and 61Bb, and the length direction of the lower frame 5 What is necessary is just to interpose the above-mentioned load cells 51A and 51B between the pair of left and right extending, for example, the square pipe-shaped frame side 5a. Further, one of the support shaft 62A near the front and the support shaft 62B near the back of the bed body 1A is movable in the length direction of the frame side 5a, and both end portions of the other support shaft on the frame side 5a. A blocking member (not shown in FIG. 56) as described above may be attached to a location corresponding to the above to prevent the support shaft on that side from moving.

  In addition, the bed main body 1 </ b> A may have a mat or the like previously laid on the bed 2. The bed 2 has a structure divided in the length direction (longitudinal direction of the bed main body 1A), and has a reclining function such that a part of the upper body side or the foot side of the user H rises. There may be. In this way, when the bed 2 is divided into two in the longitudinal direction of the bed main body 1A and a reclining function is given, for example, each bed divided portion is tilted independently on the upper frame 3 shown in FIGS. Therefore, the mechanism shown in FIGS. 1 to 6 can be used as it is.

  Furthermore, the upper frame 3 is not limited to the above-described frame structure, and various frame structures can be employed.

  The load detector 50 is not limited to the configuration in which the load cells 51A and 51B and the calculation unit 59A and the calculation unit 59A and the transmission unit 59B are electrically connected by wires 59a and 59b. It is also possible to adopt a configuration in which connections are made wirelessly (radio waves or optical signals). On the other hand, the communication method between the transmission unit 59B and the reception unit 59C is not limited to the above-described wireless communication network, and a wired communication network may be used. Further, for the load detector 50, the calculation unit 59A and the transmission unit 59B can be integrally formed.

  Furthermore, the present invention can also be applied to a bed body that does not have a caster mechanism.

  In each of the above-described examples, the bed surface forming portion 100 that forms the bed surface T in the bed main body 1A is configured by the bed 2 and the upper frame 3 that supports the bed 2. In some cases, the bed surface forming portion 100 may be one without the upper frame 3, that is, only the bed 2. Of course, the present invention can also be applied to such a case.

  Furthermore, even if the bed surface forming part 100 includes the upper frame 3, there is also a bed main body in which the elevating support mechanism 6 directly raises and lowers the bed 2 simply by the upper frame 3 functioning as an enclosure. Of course, the present invention can also be applied to such a case.

  Beds with load detection function according to the present invention are medical facilities (eg, hospitals, clinics, etc.), nursing homes, nursing homes, other accommodation facilities (eg, hotels, inns, etc.), general households (eg, home care, etc.), etc. In this case, by detecting the load applied to the bed, for example, entering the bed (sleeping), getting out of bed (getting up), standing position, body movement (eg, turning over, etc.), posture ( (Example: supine, prone, lying down, etc.) It is possible to monitor the bed user's condition (bed condition). The bed load detector according to the present invention can be incorporated not only into a new bed but also into an existing bed, and in this case, the above-described function can be exhibited.

1: Bed 1A with load detection function: Bed body 2: Bed 3: Upper frame 4: Leg 5: Lower frame 5a: Frame side 6: Lifting support mechanism 10: Receiving plate 10a: Insertion hole 11: Holding member 11B : Extension part 12: Suspension shaft 12b: Shaft part 13: Retaining stopper 22: Base group 22A, 52A: Receiving part 22B, 52B: Actuating part 22Ba: Upper surface 22C, 52C: Mounting part 22L: First base body 22M: Space Portion 22R: second base 30: receiving member 30a: placement surface 30c, 41a: tooth surface 31, 40: upper plate member 31B, 40B: upper plate portion (upper plate)
31C, 36B: Fall-off prevention part (fall-off prevention member)
32: Pedestal member 32B: Pedestal part (pedestal)
35: Clearance 36: Drop-off prevention member 38, 39, 54: Blocking member 38B, 39C, 54A, 54B: Blocking unit 41: Rolling element 50: Load detector 51A, 51B: Load cell 52: Base 57: Strain sensor 61Aa, 61Ab : First tilt movable arm 61Ba, 61Bb: second tilt movable arm 62A: first support shaft 62Aa, 62Ab, 62Ba, 62Bb: end 62B: second support shaft 62Bc: large diameter portion 63A: first Drive mechanism 63B: second drive mechanism 100: bed surface forming part B: installation surface T: bed surface H: users R1, R2, R3, R4: strain gauge (strain sensitive resistor)
d: gap

Claims (24)

A bed with a load detection function for detecting a change in load applied to the bed body by a load detector attached to the bed body, and detecting a user's state on the bed surface of the bed body,
The bed main body includes a bed surface forming portion that forms the bed surface, a lower frame that is placed on an installation surface on which the bed main body is to be installed, and the bed surface forming portion is located above the lower frame. An elevating support mechanism that is interposed between the bed surface forming portion and the lower frame so as to be positioned and supports the bed surface forming portion and lifts and lowers the bed surface forming portion with respect to the lower frame. And a configuration having
The lower frame has a plurality of linear frame sides parallel to the length direction of the bed surface,
The lifting support mechanism is
Between the lower frame and the bed surface forming portion, a load from the bed surface forming portion is applied by inclining and extending in opposite directions within a vertical plane parallel to the length direction of the frame side, A plurality of first tilt movable arms and second tilt movable arms respectively;
A first support shaft that is attached to a lower end of the first tiltable movable arm, an axial direction is orthogonal to a length direction of the frame side, and movement in the length direction of the frame side is prevented;
The second inclined movable arm is attached to the lower end of the second inclined movable arm away from the first support shaft in the length direction of the frame side, the axial direction is orthogonal to the frame side length direction, and the frame side length A second support shaft allowed to move in the direction;
A drive mechanism for changing an inclination angle of the first and second inclined movable arms;
Have
The lifting support mechanism is
The bed mechanism is moved up and down by changing the tilt angle of the first and second tilt movable arms with respect to the lower frame by the drive mechanism, and the second support shaft is moved accordingly. Configured to be proximate to the first support shaft;
The load detector is interposed between the frame side and the first support shaft, and between the frame side and the second support shaft, and is generated by a load applied from each of the support shafts. Has a load cell to measure
The load cell has a base and a strain sensor,
The substrate is
A receiving portion for receiving a load from the first or second support shaft;
An operating part that is integrally continuous with the receiving part and is deformed and deformed by a load applied to the receiving part;
A mounting portion that is integrally continuous with the operating portion and fixed to the frame side;
Have
The strain sensor is attached to the operating portion so as to detect distortion deformation of the operating portion,
And a blocking member having a pair of blocking portions positioned on both sides of the first support shaft in the frame side length direction for blocking the movement of the first support shaft in the frame side length direction. Is attached to the frame side,
A bed with a load detection function configured such that the blocking member does not come into contact with a member of a load transmission path from the first support shaft to the base, and a receiving part and an operating part of the base. A bed with a load detection function for detecting a change in load applied to the bed body by a load detector attached to the bed body, and detecting a user's state on the bed surface of the bed body,
The bed main body includes a bed surface forming portion that forms the bed surface, a lower frame that is placed on an installation surface on which the bed main body is to be installed, and the bed surface forming portion is located above the lower frame. An elevating support mechanism that is interposed between the bed surface forming portion and the lower frame so as to be positioned and supports the bed surface forming portion and lifts and lowers the bed surface forming portion with respect to the lower frame. And a configuration having
The lower frame has a plurality of linear frame sides parallel to the length direction of the bed surface,
The lifting support mechanism is
Between the lower frame and the bed surface forming portion, a load from the bed surface forming portion is applied by inclining and extending in opposite directions within a vertical plane parallel to the length direction of the frame side, A plurality of first tilt movable arms and second tilt movable arms respectively;
A first support shaft that is attached to a lower end of the first tiltable movable arm, an axial direction is orthogonal to a length direction of the frame side, and movement in the length direction of the frame side is prevented;
The second inclined movable arm is attached to the lower end of the second inclined movable arm away from the first support shaft in the length direction of the frame side, the axial direction is orthogonal to the frame side length direction, and the frame side length A second support shaft allowed to move in the direction;
A drive mechanism for changing an inclination angle of the first and second inclined movable arms;
Have
The lifting support mechanism is
The bed mechanism is moved up and down by changing the tilt angle of the first and second tilt movable arms with respect to the lower frame by the drive mechanism, and the second support shaft is moved accordingly. Configured to be proximate to the first support shaft;
The load detector is interposed between the frame side and the first support shaft, and between the frame side and the second support shaft, and is generated by a load applied from each of the support shafts. Has a load cell to measure
The load cell has a base and a strain sensor,
The substrate is
A receiving portion for receiving a load from the first or second support shaft;
An operating part that is integrally continuous with the receiving part and is deformed and deformed by a load applied to the receiving part;
A mounting portion that is integrally continuous with the operating portion and fixed to the frame side;
Have
The strain sensor is attached to the operating portion so as to detect distortion deformation of the operating portion,
Further, the second support shaft is positioned on both sides of the allowable movable range in the frame side length direction of the second support shaft, and the second support shaft falls off beyond the allowable movable range in the frame side length direction. A fall-off prevention member having a pair of fall-off prevention parts for preventing the is attached to the frame side,
A bed with a load detection function configured such that the drop-off prevention member does not contact a member of a transmission path of a load from the second support shaft to the base, and a receiving part and an operating part of the base. In the bed with a load detection function according to claim 1 , wherein:
The bed with a load detection function, wherein the elevating support mechanism has a function of inclining the bed surface forming portion with respect to a plane parallel to the lower frame. In the bed with a load detection function according to claim 1 , wherein:
The first support shaft is fixed to the first tilt movable arm, the second support shaft is fixed to the second tilt movable arm, and the first and second tilt movable arms A bed with a load detection function configured such that the first and second support shafts rotate about the axis by tilting. In the bed with a load detection function according to claim 4 :
A rolling element is provided at each end of the first and second support shafts so as to be rotatable with respect to each support shaft about the axis of each support shaft. A bed with a load detection function configured to be applied to the receiving portion of the base via In the bed with a load detection function according to claim 5 :
A gear having a tooth surface along the axial direction is formed on the outer periphery of the rolling element,
A bed with a load detection function, wherein a rack gear having a convex portion engaged with the gear is formed on a mounting surface of the rolling element. A bed with a load detection function for detecting a change in load applied to the bed body by a load detector attached to the bed body, and detecting a user's state on the bed surface of the bed body,
The bed main body includes a bed surface forming portion that forms the bed surface, a lower frame that is placed on an installation surface on which the bed main body is to be installed, and the bed surface forming portion is located above the lower frame. An elevating support mechanism that is interposed between the bed surface forming portion and the lower frame so as to be positioned and supports the bed surface forming portion and lifts and lowers the bed surface forming portion with respect to the lower frame. And a configuration having
The lower frame has a plurality of linear frame sides parallel to the length direction of the bed surface,
The lifting support mechanism is
Between the lower frame and the bed surface forming portion, a load from the bed surface forming portion is applied by inclining and extending in opposite directions within a vertical plane parallel to the length direction of the frame side, A plurality of first tilt movable arms and second tilt movable arms respectively;
A first support shaft that is attached to a lower end of the first tiltable movable arm, an axial direction is orthogonal to a length direction of the frame side, and movement in the length direction of the frame side is prevented;
The second inclined movable arm is attached to the lower end of the second inclined movable arm away from the first support shaft in the length direction of the frame side, the axial direction is orthogonal to the frame side length direction, and the frame side length A second support shaft allowed to move in the direction;
A drive mechanism for changing an inclination angle of the first and second inclined movable arms;
Have
The lifting support mechanism is
The bed mechanism is moved up and down by changing the tilt angle of the first and second tilt movable arms with respect to the lower frame by the drive mechanism, and the second support shaft is moved accordingly. Configured to be proximate to the first support shaft;
The load detector is interposed between the frame side and the first support shaft, and between the frame side and the second support shaft, and is generated by a load applied from each of the support shafts. Has a load cell to measure
The load cell has a base and a strain sensor,
The substrate is
A receiving portion for receiving a load from the first or second support shaft;
An operating part that is integrally continuous with the receiving part and is deformed and deformed by a load applied to the receiving part;
A mounting portion that is integrally continuous with the operating portion and fixed to the frame side;
Have
The strain sensor is attached to the operating portion so as to detect distortion deformation of the operating portion,
Furthermore, the base body of the load cell interposed between the first support shaft and the frame side and the base body of the load cell interposed between the second support shaft and the frame side have the same structure. A bed with a load detection function. A bed with a load detection function for detecting a change in load applied to the bed body by a load detector attached to the bed body, and detecting a user's state on the bed surface of the bed body,
The bed main body includes a bed surface forming portion that forms the bed surface, a lower frame that is placed on an installation surface on which the bed main body is to be installed, and the bed surface forming portion is located above the lower frame. An elevating support mechanism that is interposed between the bed surface forming portion and the lower frame so as to be positioned and supports the bed surface forming portion and lifts and lowers the bed surface forming portion with respect to the lower frame. And a configuration having
The lower frame has a plurality of linear frame sides parallel to the length direction of the bed surface,
The lifting support mechanism is
Between the lower frame and the bed surface forming portion, a load from the bed surface forming portion is applied by inclining and extending in opposite directions within a vertical plane parallel to the length direction of the frame side, A plurality of first tilt movable arms and second tilt movable arms respectively;
A first support shaft that is attached to a lower end of the first tiltable movable arm, an axial direction is orthogonal to a length direction of the frame side, and movement in the length direction of the frame side is prevented;
The second inclined movable arm is attached to the lower end of the second inclined movable arm away from the first support shaft in the length direction of the frame side, the axial direction is orthogonal to the frame side length direction, and the frame side length A second support shaft allowed to move in the direction;
A drive mechanism for changing an inclination angle of the first and second inclined movable arms;
Have
The lifting support mechanism is
The bed mechanism is moved up and down by changing the tilt angle of the first and second tilt movable arms with respect to the lower frame by the drive mechanism, and the second support shaft is moved accordingly. Configured to be proximate to the first support shaft;
The load detector is interposed between the frame side and the first support shaft, and between the frame side and the second support shaft, and is generated by a load applied from each of the support shafts. Has a load cell to measure
The load cell has a base and a strain sensor,
The substrate is
A receiving portion for receiving a load from the first or second support shaft;
An operating part that is integrally continuous with the receiving part and is deformed and deformed by a load applied to the receiving part;
A mounting portion that is integrally continuous with the operating portion and fixed to the frame side;
Have
The strain sensor is attached to the operating portion so as to detect distortion deformation of the operating portion,
Further, the operating portion of the base body is composed of two divided operating portions formed at intervals in the frame side length direction, and a space portion is formed between both divided operating portions, A bed with a load detection function in which the strain sensor is attached to each of the divided operation portions. In the bed with a load detection function according to claim 8 :
A bed with a load detection function in which a tip of the first or second support shaft is inserted into the space. In the bed with a load detection function according to claim 1 , wherein:
The frame side of the lower frame is made of a rectangular tube, and two side surfaces of the rectangular tube frame side are arranged along the vertical direction, and the base mounting portion A bed with a load detection function configured to be attached to any one or more of the two side surfaces, the upper surface, and the lower surface of the rectangular tubular frame side. In the bed with a load detection function according to claim 10 :
The bed with a load detection function, wherein the operating portion and the receiving portion are extended from the attachment portion of the base toward the inside of the lower frame. A bed with a load detection function for detecting a change in load applied to the bed body by a load detector attached to the bed body, and detecting a user's state on the bed surface of the bed body,
The bed main body includes a bed surface forming portion that forms the bed surface, a lower frame that is placed on an installation surface on which the bed main body is to be installed, and the bed surface forming portion is located above the lower frame. An elevating support mechanism that is interposed between the bed surface forming portion and the lower frame so as to be positioned and supports the bed surface forming portion and lifts and lowers the bed surface forming portion with respect to the lower frame. And a configuration having
The lower frame has a plurality of linear frame sides parallel to the length direction of the bed surface,
The lifting support mechanism is
Between the lower frame and the bed surface forming portion, a load from the bed surface forming portion is applied by inclining and extending in opposite directions within a vertical plane parallel to the length direction of the frame side, A plurality of first tilt movable arms and second tilt movable arms respectively;
A first support shaft that is attached to a lower end of the first tiltable movable arm, an axial direction is orthogonal to a length direction of the frame side, and movement in the length direction of the frame side is prevented;
The second inclined movable arm is attached to the lower end of the second inclined movable arm away from the first support shaft in the length direction of the frame side, the axial direction is orthogonal to the frame side length direction, and the frame side length A second support shaft allowed to move in the direction;
A drive mechanism for changing an inclination angle of the first and second inclined movable arms;
Have
The lifting support mechanism is
The bed mechanism is moved up and down by changing the tilt angle of the first and second tilt movable arms with respect to the lower frame by the drive mechanism, and the second support shaft is moved accordingly. Configured to be proximate to the first support shaft;
The load detector is interposed between the frame side and the first support shaft, and between the frame side and the second support shaft, and is generated by a load applied from each of the support shafts. Has a load cell to measure
The load cell has a base and a strain sensor,
The substrate is
A receiving portion for receiving a load from the first or second support shaft;
An operating part that is integrally continuous with the receiving part and is deformed and deformed by a load applied to the receiving part;
A mounting portion that is integrally continuous with the operating portion and fixed to the frame side;
Have
The strain sensor is attached to the operating portion so as to detect distortion deformation of the operating portion,
Further, the load cell, subjected to a load of the support shaft before Symbol with an end of the first or second support shaft is in contact, on the receiving portion of the base body so as to convey a load from the support shaft to the receiving unit A bed with a load detection function, comprising a receiving plate placed on the bed. In the bed with a load detection function according to claim 12 :
The load cell includes a plurality of the base bodies,
The plurality of bases are arranged at intervals in the longitudinal direction of the frame sides, and the receiving plate is placed so as to straddle each receiving part of the plurality of bases in a bridge shape,
A bed with a load detection function, wherein the strain sensors are respectively attached to the operating parts of the plurality of bases. In the bed with a load detection function according to claim 13 :
A bed with a load detection function, wherein a space is formed between the plurality of substrates in the load cell, and an end of the first or second support shaft is inserted into the space. In the bed with a load detection function according to claim 12 :
The load cell further comprises:
A holding member fixed to the frame side and disposed above the backing plate;
Two or more suspension shafts that are suspended from the holding member and penetrate the support plate up and down with play;
A bed with a load detection function. In the bed with a load detection function according to claim 15 :
A stopper is formed at the lower end of the suspension shaft,
A bed with a load detection function in which a gap is formed between the retainer and the backing plate. A bed with a load detection function for detecting a change in load applied to the bed body by a load detector attached to the bed body, and detecting a user's state on the bed surface of the bed body,
The bed main body includes a bed surface forming portion that forms the bed surface, a lower frame that is placed on an installation surface on which the bed main body is to be installed, and the bed surface forming portion is located above the lower frame. An elevating support mechanism that is interposed between the bed surface forming portion and the lower frame so as to be positioned and supports the bed surface forming portion and lifts and lowers the bed surface forming portion with respect to the lower frame. And a configuration having
The lower frame has a plurality of linear frame sides parallel to the length direction of the bed surface,
The lifting support mechanism is
Between the lower frame and the bed surface forming portion, a load from the bed surface forming portion is applied by inclining and extending in opposite directions within a vertical plane parallel to the length direction of the frame side, A plurality of first tilt movable arms and second tilt movable arms respectively;
A first support shaft that is attached to a lower end of the first tiltable movable arm, an axial direction is orthogonal to a length direction of the frame side, and movement in the length direction of the frame side is prevented;
The second inclined movable arm is attached to the lower end of the second inclined movable arm away from the first support shaft in the length direction of the frame side, the axial direction is orthogonal to the frame side length direction, and the frame side length A second support shaft allowed to move in the direction;
A drive mechanism for changing an inclination angle of the first and second inclined movable arms;
Have
The lifting support mechanism is
The bed mechanism is moved up and down by changing the tilt angle of the first and second tilt movable arms with respect to the lower frame by the drive mechanism, and the second support shaft is moved accordingly. Configured to be proximate to the first support shaft;
The load detector is interposed between the frame side and the first support shaft, and between the frame side and the second support shaft, and is generated by a load applied from each of the support shafts. Has a load cell to measure
The load cell has a base and a strain sensor,
The substrate is
A receiving portion for receiving a load from the first or second support shaft;
An operating part that is integrally continuous with the receiving part and is deformed and deformed by a load applied to the receiving part;
A mounting portion that is integrally continuous with the operating portion and fixed to the frame side;
Have
The strain sensor is attached to the operating portion so as to detect distortion deformation of the operating portion,
Further, the upper plate member is disposed above the second support shaft, is attached to the frame side, and extends in the frame side length direction,
The second support shaft includes the end portion disposed between the receiving portion of the base and the upper plate, and a large diameter portion formed to have a larger diameter than the end portion,
A bed with a load detection function configured such that a side surface of the large-diameter portion on the end side faces a part of the upper plate member via a gap. In the bed with a load detection function according to any one of claims 1 and 2 :
A bed with a load detection function, wherein the base body is configured such that a hole portion constituting a Roverval mechanism is provided in the operating portion. In the bed with a load detection function according to claim 18 :
The bed with a load detection function, wherein a hole provided in the operating portion of the base passes through the operating portion in a direction parallel to the frame side length direction. In the bed with a load detection function according to claim 18 :
A bed with a load detection function, wherein a hole provided in an operating portion of the base passes through the operating portion in a direction orthogonal to the frame side length direction. In the bed with a load detection function according to claim 20 :
The load cell further comprises:
It is configured to have a pedestal member attached to the frame side,
A bed with a load detection function, wherein an attachment portion of the base is attached to an upper surface of the pedestal member. In the bed with a load detection function according to claim 21 :
The load cell further comprises:
A receiver placed on the receiving portion of the base so that the end of the first or second support shaft contacts and receives the load of the support shaft and transmits the load from the support shaft to the receiving portion. A bed with a load detection function, which has a member. In the bed with a load detection function according to claim 22 :
A pair of blocking portions positioned on both sides in the frame side length direction with respect to the end portion of the first support shaft to block the movement of the first support shaft in the frame side length direction; A blocking member is attached to the frame side;
A bed with a load detection function configured such that the blocking member does not come into contact with a member of a load transmission path from the first support shaft to the base, and a receiving part and an operating part of the base.
In the bed with a load detection function according to claim 22 :
Located on both sides of the allowable movable range in the frame side length direction with respect to the end portion of the second support shaft, the second support shaft falls off beyond the allowable movable range in the frame side length direction. A drop-off prevention member having a pair of drop-off prevention parts for preventing the attachment is attached to the frame side,
A bed with a load detection function configured such that the drop-off prevention member does not contact a member of a transmission path of a load from the second support shaft to the base, and a receiving part and an operating part of the base.

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