JP6278338B2 - Bed load detector - Google Patents

Description

  The present invention relates to a bed load detection device that detects a load variation of a subject who has landed on a bed.

  In medical facilities and nursing care facilities, there is a load detection device that detects body movements of subjects who sleep or rest on a bed, for example, in order to grasp the health of subjects such as patients, infants, the elderly, and cared persons. To do.

  In the load detection device disclosed in Patent Document 1, the height of the recess formed in the mounting plate is facilitated in order to facilitate the mounting operation of the leg of the bed on the mounting plate and the lowering operation from the mounting plate. Is suppressed to a low level. The mounting plate is formed with a recess by press working, and the caster part of the bed is mounted on the recess.

The load detection device disclosed in Patent Document 2 detects a load of a bed with casters, and a recess for specifying the orientation of the bed casters is provided on the upper surface of the mounting plate.
In addition, the load detection device shown in Patent Document 3 also detects the load of a bed with casters, and is provided with a recess for specifying the orientation of the bed casters on the upper surface of the mounting plate. The load is detected by a strained body having a cantilever structure.

JP 2006-266894 A JP 2000-105884 A JP 2008-12202 A

  In the load detection device of Patent Document 1, since the height of the concave portion of the placement plate is kept low, when the movement of the subject on the bed is large, the leg portion of the bed placed on the load detection device The caster may be slipped off from the recess. If it becomes so, it will become difficult to perform load detection appropriately. Further, in order to reduce the height of the concave portion of the mounting plate, a load is detected such that a hole is formed in the central portion of the strain generating body and a groove is formed in forming a deformed portion of the strain generating body. The structure itself is also complicated.

  The load detection devices of Patent Documents 2 and 3 are assumed to be used for beds with casters. For this reason, when the leg part of the bed which does not have a caster is mounted in the load detection apparatus, the position of a leg part is not stabilized and there exists a possibility that the precision of load detection may fall. In the load detection device on which the leg portion with casters is placed, the application range of the load detection device is narrowed.

  An object of the present invention is to provide a bed load detection device capable of accurately detecting a load by stably placing a leg portion of a bed widely without being limited to a leg portion with casters. To do.

The bed load detecting device according to the present invention has a characteristic configuration in which a mounting portion on which a leg portion of a bed is placed, a strain body that flexes and deforms in response to a load from the mounting portion, and the strain body. A sensor unit that detects a deformation amount of the strain generating body, wherein the placement unit includes a guide mechanism that regulates a placement position of the leg , and a plurality of the guide mechanisms are provided in the placement unit. there a plurality of holes formed distributed on the circumference of concentric circles, in that Ru and a positioning portion protruding from the mounting section before a part is interpolated retained in the hole.

  As in this configuration, the placement unit includes a guide mechanism that regulates the placement position of the leg portion of the bed, so that the leg portion of the bed is stably placed on the placement portion. As a result, the strain generating body appropriately receives the load from the placement portion, and the accuracy of bed load detection is improved.

  In addition, according to this configuration, the guide mechanism includes a plurality of hole portions that are dispersedly formed on the circumferences of the plurality of concentric circles in the mounting portion, and a positioning portion in which a part is inserted and held in the hole portions. Therefore, the positioning part can be arranged in the hole provided in the placement part in accordance with the size and shape of the leg part of the bed. Since the positioning of the leg portion from the placement position to the outside in the radial direction is restricted by the positioning portion, the position of the leg portion with respect to the placement portion is accurately set. Thereby, even if it is a bed from which the outer diameter of a leg part differs, the detection accuracy of a load can be maintained correctly.

FEATURES configuration of bed load detection device according to the present invention includes: a mounting portion mounting the legs of the bed, and the flexure element to bending deformation under load from the mounting section, attached to the flexure element And a sensor unit that detects a deformation amount of the strain body, wherein the placement unit includes a guide mechanism that regulates a placement position of the leg, and the guide mechanism is provided in the placement unit. forming the concentric recess der the recessed central portion is, the concentric circular recesses are in a point that is formed on the stepped.

  As in this configuration, when the guide mechanism is a concave concentric recess formed in the central portion formed in the mounting portion, the leg portion is disposed at the central position of the mounting portion regardless of the outer diameter of the leg portion of the bed. It becomes easy to do. Thereby, the load detection accuracy by the sensor unit is further improved.

  In addition, as in the present configuration, when concentric concave portions formed in the placement portion are formed in steps, the leg portions are placed in any of the concave portions. Furthermore, since the positional deviation of the leg portion from the placement position to the radially outer side is restricted by the wall surface of the adjacent outer stepped portion, the position of the leg portion with respect to the placement portion is accurately set. Thereby, even if it is a bed from which the outer diameter of a leg part differs, the detection accuracy of a load can be maintained correctly.

FEATURES configuration of bed load detection device according to the present invention includes: a mounting portion mounting the legs of the bed, and the flexure element to bending deformation under load from the mounting section, attached to the flexure element And a sensor unit that detects a deformation amount of the strain body, wherein the placement unit includes a guide mechanism that regulates a placement position of the leg, and the guide mechanism is provided in the placement unit. On the other hand, it is an annular spacer that can be attached and detached.

  If it is this structure, the movement to the radial direction of a leg part will always be performed with a spacer. Since the spacer is detachable, various types of spacers may be prepared according to the outer diameter of the leg portion. With such a configuration, the leg portion is always received by the same placement portion, so that the height of the leg portion of the bed is constant. In other words, since the legs are always at the same height with respect to the sensor unit, even if an external force acts on the bed in the horizontal direction, no unexpected moment is applied to the sensor unit, and the measured value is It is not affected by the height position of the part. Therefore, the load detection accuracy is further improved.

It is a schematic perspective view which shows the use condition of the load detection apparatus for beds. It is a perspective view of the load detection apparatus for beds. It is a sectional side view of the load detection apparatus for beds. It is a top view of the load detection apparatus for beds. It is a disassembled perspective view of the load detection apparatus for beds. It is a perspective view which shows the structure of the guide mechanism of 2nd Embodiment. It is a perspective view which shows the usage example of a guide mechanism. It is a top view of a mounting part. It is a perspective view which shows the modification of arrangement | positioning of the hole of a mounting part. It is sectional drawing which shows the modification of a guide mechanism. It is sectional drawing which shows the modification of a positioning part. It is a top view which shows the modification of arrangement | positioning of the hole of a mounting part. It is a figure which shows the modification of a positioning part. It is a figure which shows another embodiment of a baseplate. It is a figure which shows another embodiment of a mounting part. It is a figure which shows another embodiment of a mounting part. It is a figure which shows another embodiment of a mounting part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
As shown in FIG. 1, a bed load detection device (hereinafter abbreviated as a load detection device) 10 is disposed at a position corresponding to each leg 2 of the bed 1 on the bed installation surface, and the subject enters the floor. Used to detect bed movement, body movement, and the like. The bed installation surface is a hospital room, an examination room, an examination room, a floor surface of a bedroom, or the like.

  An output signal from the load detection device 10 is input to the calculation means 11 via, for example, a signal cable, and the subject's bed situation is calculated. In addition, you may comprise so that the output signal from the load detection apparatus 10 may be transmitted to the calculating means 11 by a wireless communication means, for example. The occupancy status calculated by the calculation means 11 may be notified to the notification subject by, for example, a communication means or a notification means, or may be monitored by a display means.

  On the bed 1, healthy persons, sick persons, infants, elderly people, and the like as subjects are in a lying position for sleep, rest, examination, examination, and the like. The bed 1 is not limited to sleeping or resting, and may be an examination table, an examination table, a stretcher, a sofa, or the like.

  As shown in FIGS. 2 to 5, the load detection device 10 includes a bottom cover 20, a base plate 30, a strain body 40, a sensor unit 41, a placement unit 50, a cover body 60, and a spacer 70. The base plate 30 is provided with two support shafts 31 and 32 for supporting the strain body 40 and the bracket 42. A hole 33 is formed between the support shafts 31 and 32.

  The strain body 40 has a substantially rectangular plate shape, and is deformed by receiving a load from the placement portion 50. A sensor unit 41 that detects the amount of deformation of the strain body 40 is attached to the strain body 40. The sensor unit 41 includes a strain sensor of the strain generating body 40 (for example, strain gauges G1 and G2 attached to the surface of the strain generating body 40), a bracket 42, and an amplifier device for amplifying signals from the strain gauges G1 and G2. 45, an FPC board connected to the strain gauges G1 and G2 and the amplifier device 45 is provided.

  Holes 40 a and 40 b are formed at both ends of the strain generating body 40. The bracket 42 is disposed on the upper surface of the strain body 40. The bracket 42 is provided with support holes 42a and 42b at both ends thereof, and is formed so as to extend to the side of the strain generating body 40, in other words, in a direction orthogonal to the extending direction of the strain generating body 40. . The support shafts 31 and 32 of the base plate 30 are inserted into the hole portions 40 a and 40 b of the strain body 40 and the support hole portions 42 a and 42 b of the bracket 42, and the nuts 43 and 43 are screwed onto the support shafts 31 and 32. Thus, the strain body 40 and the bracket 42 are fixed to the base plate 30.

  The strain body 40 is sandwiched between the bracket 42 and the ring-shaped base portion 40c. The strain body 40 fixed to the base plate 30 has a degree of freedom in the longitudinal direction (the direction connecting the holes 40a and 40b) and is restricted from moving in the direction intersecting the longitudinal direction.

  A connecting shaft (bolt) 44 for connecting the mounting portion 50 is erected at the center of the strain generating body 40. The connecting shaft 44 is inserted from below into a hole formed in the central portion of the strain body 40, and a washer 44 a is fitted from above the strain body 40. Contact between the bottom 44 b of the connecting shaft 44 and the base plate 30 is avoided by the hole 33. The bracket 42 is equipped with an amplifier device 45 for amplifying signals from the strain gauges G1 and G2. A sensor-side connector 46 is connected to the amplifier device 45, and a cable-side connector 47 that transmits the output of the amplifier device 45 to the electronic control unit (calculation means) 11 is connected to the sensor-side connector 46. The cable side connector 47 is provided with a signal cable 48.

  The mounting portion 50 includes a cylindrical portion 52 on the outer periphery of a circular flat plate portion 51, and a concentric concave portion 53 having a depressed central portion is formed. The flat plate portion 51 is formed with a rod-shaped portion 54 that protrudes downward. The mounting portion 50 is connected to the strain body 40 by screwing the connecting shaft 44 into the inner groove portion formed in the rod-like portion 54.

  The cover body 60 houses the base plate 30, the strain body 40, the sensor unit 41, and the placement unit 50. The cover body 60 includes a first cover portion 61 that houses the bracket 42, the amplifier device 45, and the placement portion 50, a second cover portion 62 that houses the sensor side connector 46, the cable side connector 47, and the signal cable 48, Have The first cover portion 61 is formed in a cylindrical shape, and the second cover portion 62 is formed continuously from a part of the outer periphery of the first cover portion 61 and includes an upper surface cover 62a. On the inner peripheral surface of the first cover portion 61, vertical ribs 63 are provided at predetermined intervals. The rib 63 enhances the synthesis of the first cover portion 61, and the lower end portion of the rib 63 comes into contact with the upper surface of the base plate 30 to position the first cover portion 61. Claw portions 64 facing inward are formed on the bottoms of the first cover portion 61 and the second cover portion 62, respectively. With the lower end portion of the rib 63 in contact with the upper surface of the base plate 30, the claw portion 64 engages with the engaging portion 35 of the base plate 30, and the cover body 60 is fixed to the base plate 30. An annular spacer 70 having a hole 71 is detachably mounted on the mounting portion 50.

  When a load acts on the strain generating body 40 via the connecting shaft 44, the strain generating body 40 bends in a state where both ends are supported by the support shafts 31 and 32. At that time, on the surface of the strain generating body 40, between each of the support shafts 31, 32 and the connecting shaft 44, a compressive strain is generated on the support shafts 31, 32 side in proportion to a load, and a tensile strain is formed on the connecting shaft 44 side. Occurs. The strain gauges G1 and G2 detect these compressive strains and tensile strains.

  For example, a bridge circuit is configured by the strain gauges G <b> 1 and G <b> 2, and an electric signal corresponding to the deflection of the strain generating body 40, i.e., the load applied to the strain generating body 40 is output. It should be noted that not only the setting is made so that the compressive strain is generated on the support shafts 31 and 32 side and the tensile strain is generated on the connecting shaft 44 side, but the compressive strain or the tensile strain is set only on the support shafts 31 and 32 side. In some cases, the connecting shaft 44 may be set so that compressive strain or tensile strain is generated.

  In the bed 1 arranged on the load detection device 10, when the subject lands on the bed 1, the subject's load acts on the strain body 40 from the leg portion 2 through the placement portion 50. Thereby, the center part of the strain body 40 supported at both ends by the support shafts 31 and 32 is bent, and the surface of the strain body 40 is between the support shafts 31 and 32 and the connecting shaft 44. In proportion to the load, compressive strain is generated on the support shafts 31 and 32 side, and tensile strain is generated on the connecting shaft 44 side. These compressive strain and tensile strain are detected by the strain gauges G1 and G2, and the detection outputs of the strain gauges G1 and G2 are amplified by the amplifier device 45. The detection output amplified by the amplifier device 45 is transmitted to the electronic control unit (arithmetic unit) 11 by the signal cable 48 via the sensor side connector 46 and the cable side connector 47.

  Thus, based on the deformation amount of the strain body 40, the load of the subject who is to land on the bed 1 is detected. And a test subject's state can be grasped | ascertained appropriately by detecting the variation | change_quantity of the load based on a detection result.

  When the shape of the concave portion 53 of the placement portion 50 does not match the shape of the bottom portion of the leg portion 2 of the bed 1, the leg portion 2 placed on the placement portion 50 is moved by the movement of the subject on the bed 1. The position is easily moved. If the leg part 2 moves in the mounting part 50, it will shake in the load received from the mounting part 50, and the precision of load detection will fall. Therefore, the load detection device 10 includes a guide mechanism that regulates the placement position of the leg portion 2 of the bed 1. The guide mechanism is constituted by an annular spacer 70, for example. The outer shape of the spacer 70 is the same shape as the flat plate portion 51, and the hole portion 71 is formed in the same shape as the outer peripheral shape of the bottom portion of the leg portion 2. Thereby, since the leg part 2 mounted in the mounting part 50 contact | abuts to the internal peripheral surface of the hole 71, and a mounting position is controlled, the position of the leg part 2 is hold | maintained stably. As a result, the strain generating body 40 appropriately receives the load from the placement unit 50, and the load detection accuracy of the bed 1 is improved.

  By preparing a plurality of spacers 70 having different inner diameters of the holes 71, it is possible to easily cope with beds having different leg shapes. The hole 71 may be formed in a square shape in accordance with the shape of the leg 2.

  The mounting portion 50 is formed with a concentric recess 53 having a depressed central portion. Therefore, the guide mechanism may be configured such that the shape of the recess 53 matches the shape of the bottom of the leg 2 of the bed 1.

  The cover body 60 is formed with a cable guide portion 65 that pulls out the signal cable 48 connected to the sensor unit 41 to the upper side of the cover body 60. The cable guide portion 65 is formed in the vertical direction at the connection portion between the first cover portion 61 and the second cover portion 62. By guiding the signal cable 48 to the cable guide portion 65, the signal cable 48 can be reliably pulled out above the cover body 60. Since the upper side of the cover body 60 is a direction away from the bed placement surface, the signal cable 48 can be easily separated from the bed placement surface. The drawn signal cable 48 can be easily along the bed frame separated from the bed placement surface, and the signal cable 48 can be easily maintained in a state separated from the bed placement surface.

  The cable guide portion 65 includes a first fixing portion 66 that holds the signal cable 48 so as to prevent displacement. The first fixing portion 66 is configured such that the first cover portion 61 side is opened and the grip portion 66a is urged in the closing direction. As a result, the signal cable 48 is gripped by the first fixing portion 66 and reliably held at that position. Therefore, it is easy to maintain the signal cable 48 in the upward posture in the cable guide portion 65.

  If the first fixing portion 66 is at a position that is substantially the same as or lower than the upper position of the tubular portion 52 of the placement portion 50, the leg portion 2 of the bed 1 may ride on the first fixing portion 66. If so, the signal cable 48 may come into contact with the leg portion 2 above the first fixing portion 66 and the signal cable 48 may be damaged. For this reason, the first fixing portion 66 is provided on the upper portion of the cable guide portion 65, and the position of the first fixing portion 66 is set to be higher than the upper position of the tubular portion 52 of the placement portion 50. . If it carries out like this, the leg part 2 of the bed 1 will become difficult to get on the 1st fixing | fixed part 66, and the signal cable 48 above the 1st fixing | fixed part 66 is prevented from contacting with the leg part 2. FIG.

When a tensile force is applied to the signal cable 48 drawn upward by the cable guide portion 65, this tensile force may directly act on the cable-side connector 47 connected to the sensor-side connector 46. In this case, since the cable side connector 47 is affected by the tensile force, the detection result output from the cable side connector 47 may vary.
Therefore, the base plate 30 is provided with a second fixing portion 49 for latching the signal cable 48. The second fixing portion 49 includes a holding portion 49a biased in the closing direction, and the signal cable 48 is held by inserting the signal cable 48 into the holding portion 49a. The second fixing portion 49 is attached to the screw receiving portion 34 of the base plate 30 by an attaching screw 49b. By providing the base plate 30 with the second fixing portion 49, the position of the signal cable 48 hooked on the second fixing portion 49 can be maintained even when the signal cable 48 is pulled upward. Thereby, the action on the cable side connector 47 due to the tensile force of the signal cable 48 can be prevented.

[Second Embodiment]
In this embodiment, as shown in FIGS. 6 to 8, as a guide mechanism that regulates the placement position of the leg portion 2 of the bed, each circumference of a plurality of concentric circles 81 to 83 on the placement surface (flat plate portion) 51. A plurality of hole portions 81 a to 83 a formed on the top, and a positioning portion 90 that is partly inserted and held in the hole portions 81 a to 83 a and protrudes from the placement surface 51 are provided.

  The placement surface (flat plate portion) 51 of the placement portion 50 is provided with a plurality of concentric circles 81 to 83 centering on the connecting shaft 44 as an index of the placement position of the leg portion 2. The concentric circles 81 to 83 are drawn on the mounting surface 51 using various printing techniques. The innermost first concentric circle 81 has three holes 81a on the circumference. Three holes 82 a and 83 a are formed in the second concentric circle 82 outside the first concentric circle 81 and the third concentric circle 83 outside the second concentric circle 82. In addition, you may form only the hole parts 81a-83a, without providing the concentric circles 81-83 (circumferential line).

  The holes 81a to 83a are all uniformly distributed in the circumferential direction (for example, at intervals of 120 degrees). Moreover, the hole parts 81a-83a are arrange | positioned at zigzag form so that it may not overlap in the radial direction of each concentric circle 81-83. Thereby, since the adjacent concentric hole portions are provided at positions separated from each other, a decrease in strength of the placement portion 50 can be suppressed. Moreover, even when the radial interval between adjacent concentric circles is small, the holes can be arranged in a state of being separated from each other, so that the present invention can also be applied to a load detection device having a small placement surface 51.

The positioning portion 90 that is partially inserted and held in the holes 81 a to 83 a is configured by a pin member 93 having a head portion 91 and an insertion portion 92. The head 91 and the insertion portion 92 are both formed in a columnar shape, and the insertion portion 92 has a diameter smaller than that of the head 91. The insertion portion 92 can be inserted into the holes 81a to 83a, and the diameter of the head 91 is larger than the diameter of the holes 81a to 83a.
For this reason, the head 91 of the pin member 93 is held in a state of protruding from the placement surface 51. In addition, it is comprised with the screw | thread of the insertion part 92, and the screwing part corresponding to the insertion part 92 may be formed in the internal peripheral surface of hole part 81a-83a.

  In order to regulate the placement position of the leg portion 2 of the bed 1, the leg portion 2 is placed on the placement surface 51 and the leg portion 2 is positioned so as to be approximately at the center position of the placement surface 51. Thereafter, the pin member 93 is inserted into the holes 81 a to 83 a located on the innermost side on the outer peripheral side of the leg portion 2. For example, in the case of the small-diameter leg 2, the pin member 93 is inserted into the hole 81a formed in the first concentric circle 81 (FIG. 7). Although not shown, the holes 82a and 83a of the second concentric circle 82 and the third concentric circle 83 are appropriately used in accordance with the diameter of the leg portion 2.

  As a result, the placement position of the leg portion 2 on the placement surface 51 is regulated by the three pin members 93 arranged around the leg portion 2. As a result, the leg 2 of the bed 1 can be held near the center of the placement surface 51, and the load detection accuracy of the bed 1 can be accurately maintained. When the leg 2 is larger than the third concentric circle 83, the pin member 93 is not necessary, and the position of the leg 2 is held by the outer peripheral wall of the placement surface 51.

  When the positional relationship between the leg 2 and the concentric circles 81 to 83 is known in advance, the leg 2 is placed inside the pin member 93 after the pin member 93 is inserted into the corresponding holes 81a to 83a. It may be placed. In addition, after the pin member 93 is partially inserted into the holes 81a to 83a and the leg 2 is placed on the placement surface 51, the remaining pin member 93 may be inserted into the holes 81a to 83a. . The hole portion into which the pin member 93 is not inserted may be configured to be closed using another seal or cover.

[Modification of Second Embodiment]
(1) As shown in FIG. 9, the holes 81a to 83a formed on the circumference of the plurality of concentric circles 81 to 83 may be arranged on a straight line extending in the radial direction. In this way, it is possible to easily confirm which of the concentric circles 81 to 83 the pin member 93 is located in the concentric hole. However, since the holes 81a to 83a are continuous in the radial direction, the strength of the placement unit 50 may be reduced. For this reason, in order to ensure the strength of the placement portion 50, the adjacent holes 81a to 83a need to have appropriate intervals.

(2) The holes 81a to 83a formed in the mounting portion 50 may be formed in a bottomed concave shape. In that case, as shown in FIG. 10, the pin member 93 may be formed in a columnar shape in which the head portion 91 and the insertion portion 92 have the same diameter.

(3) As shown in FIG. 11, the positioning portion 90 is an annular member provided with an annular portion 95 having a hole portion 94 and an insertion portion 96 provided below the annular portion 95 in place of the pin member 93. 97 may be sufficient. The annular member 97 is individually required for each concentric circle 81-83. The annular member 97 is mounted on the placement surface 51 by inserting the insertion portion 96 into the hole portions 81 a to 83 a on the circumference of the corresponding concentric circles 81 to 83. The leg portion 2 placed on the placement portion 50 abuts against the inner peripheral surface of the hole portion 94 so that the placement position is regulated and stably held. As a result, the strain generating body 40 appropriately receives the load from the placement unit 50, and the load detection accuracy of the bed 1 is improved.

(4) In the above-described second embodiment (including the modification), an example in which three concentric circles and three concentric hole portions are provided is shown, but a plurality of concentric circles and hole portions may be provided. For example, when the leg 2 is a square leg (cross-sectional square), it is preferable to form four holes into which the pin member 93 is inserted. Further, as shown in FIG. 12, six holes 81a to 83a are formed on the circumference of concentric circles 81 to 83, round legs (circular cross section) using the concentric circles 81 to 83 as indices, and concentric quadrangle 81. You may comprise so that it can respond | correspond to both the square leg (cross-sectional square) which makes '-83' into a parameter | index.

(5) There may be a gap between the positioning portion 90 (the pin member 93 and the annular member 97) and the leg portion 2, and in this case, the movement of the leg portion 2 is allowed slightly. Therefore, in order to suppress such movement of the leg 2, as shown in FIG. 13, for example, the head 91 of the pin member 93 can be deformed by elastic rubber or the like, and the pin member 93 is brought into contact with the leg 2. You may comprise. A deformable rib may be provided on the head portion 91 of the pin member 93, and similarly, the inner peripheral side of the annular portion 95 of the annular member 97 may be configured to be deformable.

  In this way, the pin member 93 is pressed against the leg 2 and placed, or the placement area of the leg 2 formed by the positioning part 90 is set smaller than the leg 2 so that the positioning part 90 and the leg The part 2 can be brought into contact with no gap. In addition, the horizontal cross section of the head 91 of the pin member 93 may be eccentric so that any portion around the head 91 abuts on the leg 2. When the positioning portion 90 is the pin member 93, it is not always necessary to provide a configuration in which all the pin members 93 are in contact with the above-described leg portion 2, and it is sufficient that at least one or more pin members 93 are provided.

[Other Embodiments]
(1) In the above embodiment, the example in which the second fixing portion 49 is fixed to the base plate 30 by using the mounting screw 49b is shown. However, as shown in FIG. A part of the part may be formed by bending. The base plate 30 has an engaging portion 35 with which the claw portion 64 of the cover body 60 is engaged. Therefore, when forming the base plate 30, the engaging part 35 and the 2nd fixing | fixed part 49 can also be processed simultaneously.

(2) In the above-described embodiment, an example in which the position of the leg portion 2 on the placement portion 50 is regulated using the spacer 70 is shown, but instead of the spacer 70, it is recessed at the center of the placement portion 50. The position of the leg portion 2 may be regulated by the concentric concave portion 53. The mounting unit 50 may be configured to be replaceable by preparing a plurality of components having different diameters of the recess 53.

(3) As shown in FIG. 15, the mounting portion 50 may form concentric concave portions 53 in a step shape (a plurality of step portions 55). If the concentric concave portion 53 formed in the mounting portion 50 is formed in a step shape, the leg portion 2 is placed in any of the concave portions 53 (step portions 55). Furthermore, since the position shift of the leg part 2 from the said mounting position to a radial direction outer side is controlled by the wall surface of an adjacent outer step part, the position setting of the leg part 2 with respect to the mounting part 50 is performed correctly. Thereby, even if it is the bed 1 from which the outer diameter of the leg part 2 differs, the detection accuracy of a load can be maintained correctly.

(4) In the configuration of the second embodiment, the placement unit 50 may be a concentric recess 53 formed in a step shape. As shown in FIG. 16, in the mounting part 50 which has the step part 55, even if it is the positioning part 90 inserted and hold | maintained by the hole 82a (in the figure, it may replace with the pin member 93 and the pin member 93, and it may be the annular member 97). In addition to the restriction of the movement of the leg 2 according to (Good), the movement of the leg 2 is also restricted by the step portion 55. Thereby, the leg part 2 can be stably hold | maintained by the mounting position.

(5) As shown in FIG. 17, the mounting portion 50 may be formed by an inclined surface 56 in which concentric concave portions 53 are continuous. When the concentric concave portion 53 is formed by the continuous inclined surface 56, the mounting position is determined in a state where the leg portion 2 is always in contact with the inclined surface 56 regardless of the outer diameter of the leg portion 2. Thereby, the stable installation state of the leg part 2 can be obtained, and the load detection accuracy can be further improved.
Such a continuous inclined surface 56 may be formed in a conical shape as shown in FIG. 17, or may be formed in a curved shape like a sphere. The degree of inclination may be arbitrarily changed between the center portion and the outer edge portion of the mounting portion 50. Moreover, you may comprise combining the inclined surface 56, the hole parts 81a-83a in the said 2nd Embodiment, and the positioning part 90 (the pin member 93 or the annular member 97).

  The bed load detection device according to the present invention can be widely used for beds and bedding provided with legs.

DESCRIPTION OF SYMBOLS 1 Bed 2 Leg part 10 Load detection apparatus 30 Base plate 40 Strain body 41 Sensor unit 48 Signal cable 49 2nd fixing | fixed part 50 Mounting part 51 Flat part (mounting surface)
53 Concavity (guide mechanism)
55 Step (Guide mechanism)
56 Inclined surface (guide mechanism)
60 Cover body 65 Cable guide portion 66 First fixing portion 70 Spacer (guide mechanism)
80 hole (guide mechanism)
90 Positioning part (guide mechanism)
G1, G2 Strain gauge (Strain sensor)

Claims (3)

A placement section for placing the leg of the bed;
A strain body that flexes and deforms in response to a load from the mounting portion;
A sensor unit that is attached to the strain body and detects the amount of deformation of the strain body, and
The placement unit includes a guide mechanism that regulates a placement position of the leg ,
The guide mechanism has a plurality of holes formed in a distributed manner on each circumference of a plurality of concentric circles in the placement section, and a part of the guide mechanism is inserted and held to protrude from the placement section. A bed load detection device comprising: a positioning unit ; A placement section for placing the leg of the bed;
A strain body that flexes and deforms in response to a load from the mounting portion;
A sensor unit that is attached to the strain body and detects the amount of deformation of the strain body, and
The placement unit includes a guide mechanism that regulates a placement position of the leg ,
The bed load detection device , wherein the guide mechanism is a concave concentric recess formed in a central portion formed in the placement portion, and the concentric recess is formed in a step shape . A placement section for placing the leg of the bed;
A strain body that flexes and deforms in response to a load from the mounting portion;
A sensor unit that is attached to the strain body and detects the amount of deformation of the strain body, and
The placement unit includes a guide mechanism that regulates a placement position of the leg ,
The bed load detection device , wherein the guide mechanism is an annular spacer that is detachable from the mounting portion .

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