JP2018057550A - Bed load detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress breakage due to an excessive load of a bed load detector.SOLUTION: A load detector 1 comprises: a substrate part 2; a cantilever beam part 11 on whose tip end side, a load reception plate part 13 having a mount face 14 on which a leg part of a bed is mounted, is formed; a strain detection sensor 19 for detecting strain of the cantilever beam part 11; and a stop part 9. The cantilever beam part 11 is supported to the substrate part 2 in a cantilever condition so that the load reception plate part 13 can be displaced downward. The stop part 9 collides and contacts to the stop part 9 in a halfway of downward displacement of the load reception plate part 13 when an excessive load C is applied to the mount face 14, for stopping downward displacement of the load reception plate part 13.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a bed load detector that is used in a medical facility, a nursing facility, an accommodation facility, a general household, and the like and detects a load applied to the bed.

  Used to measure the presence of a bed user (eg, sick, elderly, cared, healthy) on the bed (eg, entering, leaving, raising the body, turning over) As load detectors to be used, for example, bed load detectors disclosed in Patent Documents 1 to 7 are known.

  Each of the load detectors described above includes a cantilever portion and a substrate portion that supports the cantilever portion. A load receiving plate portion is formed on the tip end side of the cantilever portion, and a mounting surface on which the leg portion of the bed is mounted is formed on the upper surface of the load receiving plate portion. The cantilever portion is a substrate portion so that the load receiving plate portion is disposed at a position spaced upward from the bed installation surface (eg, floor surface) and the load receiving plate portion can be displaced downward. Is supported in a substantially horizontal cantilever shape. The load detector is configured to detect a load applied to the bed by placing the leg portion of the bed on the placement surface in a state where the substrate portion is placed on the bed installation surface. ing.

  In the load detector, for example, the maximum load that can be actually detected by the load detector is set as the rated load of the load detector.

JP 2009-22650 A JP 2009-22648 A JP 2008-65700 A JP 2008-12202 A JP 2007-167492 A JP 2006-302266 A JP 2011-56152 A

  By the way, in the state in which the leg portion of the bed is placed on the placement surface of the load detector, a plurality of people may get on the bed at the same time. In this case, for example, when the condition of a user (eg, a sick person) on the bed suddenly changes in a hospital or the like, a plurality of people can ride on the bed at the same time in order to give emergency treatment to the user. . In such a case, an excessive load exceeding the rated load of the load detector is applied to the mounting surface, and as a result, the load detector may be damaged due to plastic deformation of the cantilever portion.

  The present invention has been made in view of the above-described technical background, and a problem to be solved by the present invention is to suppress breakage of the bed load detector due to an excessive load.

  The present invention provides the following means.

[1] A cantilever portion in which a load receiving plate portion having a placement surface on which a leg portion of the bed is placed is formed on the distal end side;
A substrate part placed on the bed installation surface and supporting the cantilever part;
A strain detection sensor that detects a strain of the cantilever portion and outputs a signal used to detect a load applied to the bed;
A stop, and
The cantilever portion is disposed on the substrate portion so that the load receiving plate portion is disposed at a position spaced upward from the bed installation surface and the load receiving plate portion can be displaced downward. Supported in a cantilevered manner,
The mounting surface is formed on the upper surface of the load receiving plate part,
The stop portion stops the downward displacement of the load receiving plate portion by striking the stop portion while the load receiving plate portion is displaced downward when an excessive load is applied to the mounting surface. A load detector for a bed.

[2] The substrate portion includes a pair of side frame portions that are spaced apart from each other, a first connection frame portion that connects one end portions of the both side frame portions, and the other end of the both side frame portions. A second connecting frame part connecting the parts,
The cantilever portion is arranged such that the load receiving plate portion is spaced apart from the second connection frame portion of the substrate portion and the load receiving plate portions are on both sides of the substrate portion. The first connecting frame portion of the substrate portion is supported in a cantilever manner so as to be able to move downward between the frame portions,
The bed load detector according to claim 1, wherein the second connecting frame portion of the substrate portion functions as the stop portion.

[3] A cantilever portion in which a load receiving plate portion having a placement surface on which a leg portion of the bed is placed is formed on the distal end side;
A substrate part placed on the bed installation surface and supporting the cantilever part;
A strain detection sensor that detects a strain of the cantilever portion and outputs a signal used to detect a load applied to the bed,
The cantilever portion is arranged on the substrate portion so that the load receiving plate portion is disposed at a position spaced upward from the bed installation surface and the load receiving plate portion can be displaced downward. Supported in a cantilevered manner,
The mounting surface is formed on the upper surface of the load receiving plate part,
When an excessive load is applied to the mounting surface, the load receiving plate portion is configured to stop the downward displacement of the load receiving plate portion by striking the bed installation surface while the load receiving plate portion is moving downward. Bed load detector.

  The present invention has the following effects.

  In the previous item [1], the load detector stop portion is moved downwardly when the load receiving plate portion hits the stop portion while the load receiving plate portion is displaced downward when an excessive load is applied to the mounting surface. Therefore, even when an excessive load is applied to the mounting surface, damage to the load detector (for example, plastic deformation of the cantilever portion) can be suppressed.

  In the previous item [2], since the substrate portion includes both side frame portions and the first and second connection frame portions, the substrate portion has high rigidity. Therefore, the substrate portion can firmly support the cantilever portion. Furthermore, since the second connection frame portion of the substrate portion functions as a stop portion, it is not necessary to provide a separate stop portion for the load detector, and the structure of the load detector can be simplified.

  In the previous item [3], the load detector stops the downward displacement of the load receiving plate portion by striking the bed installation surface while the load receiving plate portion is displaced downward when an excessive load is applied to the mounting surface. Therefore, even when an excessive load is applied to the mounting surface, damage to the load detector (for example, plastic deformation of the cantilever portion) can be suppressed.

FIG. 1 is a perspective view of one use state of a bed load detector according to the first embodiment of the present invention. FIG. 2 is an enlarged view of a portion A in FIG. FIG. 3 is a perspective view of the load detector. FIG. 4 is an exploded perspective view of the load detector. 5 is a cross-sectional view taken along line BB in FIG. FIG. 6 is a cross-sectional view of the load detector in a state where an excessive load is applied to the mounting surface of the load detector. FIG. 7 is a cross-sectional view of a load detector for a bed according to the second embodiment of the present invention in a state in which an excessive load is applied to the mounting surface of the load detector.

  Next, a first embodiment of the present invention will be described below with reference to the drawings.

  Reference numeral “1” in FIG. 1 denotes a bed load detector according to the first embodiment of the present invention.

  Reference numeral “20” in FIG. 1 is a bed occupancy state measuring apparatus according to an embodiment of the present invention. This measuring device 20 measures the occupancy status of the user 40 who uses the bed 30 on the bed 30, and includes the four load detectors 1, the arithmetic unit 21 and the like of the first embodiment. doing.

  The presence of the user 40 measured by the measuring device 20 includes the user 40 getting on the bed 30, the user 40 getting out of the bed 30, and whether the user 40 is raised. The presence / absence of the user 40 turning over and the like is included.

  The bed 30 is generally commercially available, and is used in medical facilities (eg, hospitals), elderly facilities, nursing homes, accommodation facilities (eg, hotels), general homes, and the like. Further, the bed 30 is installed on a bed installation surface 35 that is a floor surface in a hospital room, examination room, examination room, accommodation room, bedroom, or the like.

  On the bed 30, as a user 40, people such as sick people, dementia patients, elderly people, guests, and healthy people have various postures (eg, supine) for sleep, rest, medical treatment, examination, examination, and the like. Be in bed with posture, prone posture, side posture.

  Here, in the present embodiment, for convenience of explanation, in a state where the user 40 sleeps in a supine posture on the bed 30, the head side of the user 40 in the bed 30 is “the head side of the bed 30”, and the foot of the user 40. The right side of the user 40 is defined as “the right side of the bed 30” and the left side of the user 40 is defined as “the left side of the bed 30”. Therefore, the left-right direction of the bed 30 coincides with the width direction of the bed 30.

  The bed 30 has four legs 31. The lower end of each leg 31 is not provided with a rotatable caster for moving the bed 30. In addition, in this invention, the caster may be provided in each lower end part of the bed 30 besides.

  The width of the lower surface 33 of each leg 31 is smaller than the width of the mounting surface 14 described later of the load detector 1.

  In addition, the lower surface (33, refer FIG. 2) of each leg part 31 of the bed 30 is a contact surface to the bed installation surface 35 of each leg part 31 when not using each load detector 1. FIG.

  Each load detector 1 detects a load applied to the bed 30. More specifically, each load detector 1 detects a load applied to a corresponding leg portion 31 of the bed 30. That is, in the four load detectors 1, the load detector 1 disposed below the head-side left leg 31 of the bed 30 and the load detection disposed below the head-side right leg 31 of the bed 30. The load detector 1 disposed below the foot-side left leg 31 of the bed 30, and the load detector 1 disposed below the foot-side right leg 31 of the bed 30, respectively, The load applied to the head-side left leg 31 of the bed 30, the load applied to the head-side right leg 31 of the bed 30, the load applied to the foot-side left leg 31 of the bed 30, and the foot-side right leg 31 of the bed 30. The load applied to the is detected. These load detectors 1 have the same shape and the same dimensions.

  The width direction of the load detector 1 coincides with the left-right direction of the bed 30 (that is, the width direction of the bed 30).

  The load detected by the load detector 1 is used for measuring the occupancy status of the user 40 on the bed 30, and in the present embodiment, the occupancy status is measured by the measurement device 20 described above. Used for.

  In the load detector 1, the maximum load that can be actually detected by the load detector 1 is set as the rated load of the load detector 1. The rated load is set to 200 kgf (1960 N), for example.

  As shown in FIGS. 3 and 4, the load detector 1 includes a substrate portion 2, a substantially plate-like cantilever portion 11, a strain detection sensor 19, a stop portion 9, and the like. The substrate portion 2 and the cantilever portion 11 are both made of metal, and more specifically, for example, made of aluminum (including an alloy thereof).

  The cantilever portion 11 functions as a strain generating body, and a load receiving plate portion 13 is formed on the distal end side (free end side) of the cantilever portion 11. A mounting surface 14 is formed on the upper surface of the load receiving plate portion 13. A leg 31 of the bed 30 is placed on the placement surface 14. In the present embodiment, the lower surface 33 as the lower end portion of the leg portion 31 of the bed 30 is placed on the placement surface 14 in detail. The mounting surface 14 has a quadrangular shape in plan view and a flat shape.

  Further, a drop-preventing ridge 15 is locally formed at the tip of the placement surface 14 along the edge of the placement surface 14. The protrusion 15 corresponds to a fall prevention means for preventing the leg 31 of the bed 30 from dropping from the placement surface 14. More specifically, the lower surface 33 of the leg 31 of the bed 30 is placed on the ridge 15. This is a part for preventing the falling from the tip of the mounting surface 14.

  A plurality of female screw holes 16 corresponding to the fixing bolts 8 are formed in the base end portion (fixed end portion) 12 of the cantilever portion 11 so as to penetrate in the thickness direction (that is, the vertical direction). In the present embodiment, the number of fixing bolts 8 is four. The fixing bolt 8 is for fixing the base end portion 12 of the cantilever portion 11 to the substrate portion 2 (specifically, a first connecting frame portion 4A to be described later of the substrate portion 2). Consists of.

  A through-hole 17 for forming a random mechanism that penetrates in the width direction of the cantilever portion 11 is formed in the expected strain generation portion 18 that is formed between the base end portion 12 and the load receiving plate portion 13 in the cantilever portion 11. Is formed. As a result, a robust mechanism is formed in the expected strain generation portion 18 of the cantilever portion 11.

  The strain detection sensor 19 detects a strain (including its variation, the same applies hereinafter) generated in the cantilever portion 11, and is a signal used to detect a load applied to the bed 30 (specifically, the leg portion 31 of the bed 30). Is output and is attached to the upper surface of the expected strain generation portion 18 of the cantilever portion 11 with an adhesive or the like.

  For example, a piezoelectric film sensor is used as the strain detection sensor 19. The piezoelectric film sensor is made of, for example, plastic PVDF (PolyVinylidene DiFluoride) having a piezoelectric effect, and is also called a piezo film sensor. The strain detection sensor 19 detects the strain generated in the expected strain generation portion 18 of the cantilever portion 11 and outputs a voltage corresponding to the detected strain magnitude to the bed 30 (specifically, the leg portion of the bed 30). 31) is output from the strain detection sensor 19 as a signal used for detecting a load applied to the load 31).

  As shown in FIG. 4, the substrate portion 2 includes a pair of left and right side frame portions 3, 3 disposed opposite to each other in the width direction of the substrate portion 2 (load detector 1), and both side frame portions 3. 3A, a first connection frame portion 4A in which one end portions of the two frame portions 3 are connected to each other, and a second connection frame portion 4B in which the other end portions of the both side frame portions 3 and 3 are connected to each other. Both the connecting frame portions 4A and 4B are arranged apart from each other in the length direction of the substrate portion 2 (load detector 1). And the board | substrate part 2 is formed in the planar view substantially square frame shape by the both-side frame parts 3 and 3 and both connection frame part 4A, 4B. Therefore, a central hole 5 having a substantially rectangular shape in plan view surrounded by both side frame portions 3 and 3 and both connecting frame portions 4A and 4A is formed in the central portion of the substrate portion 2.

  In addition, a plurality of insertion holes 6 for fixing bolts 8 are formed in the first connecting frame portion 4A so as to penetrate in the vertical direction.

  And the base end part 12 of the cantilever part 11 is being fixed on the 1st connection frame part 4A of the board | substrate part 2 with the some fixing bolt 8. As shown in FIG. In this fixed state, as shown in FIG. 5, each fixing bolt 8 is inserted into the insertion hole 6 of the first connecting frame portion 4 </ b> A upward from the lower side thereof, and the base end portion 12 of the cantilever portion 11. It is screwed into the female screw hole 16.

  In this way, the base end portion 12 of the cantilever portion 11 is fixed on the first connecting frame portion 4A, so that the cantilever portion 11 has the load receiving plate portion 13 on both side frame portions 3 of the substrate portion 2, 3 is supported in a substantially horizontal cantilevered manner on the first connecting frame portion 4A so that it can be displaced downward.

  Further, the cantilever portion 11 is configured so that the load receiving plate portion 13 is located on the bed installation surface 35 when the substrate portion 2 is placed on the bed installation surface 35 (indicated by a two-dot chain line in FIG. 5). The first connection frame portion so that the load receiving plate portion 13 is further disposed at a position slightly spaced above the second connection frame portion 4B of the substrate portion 2 so as to be disposed at a position spaced apart upward. Supported by 4A.

  Further, the cantilever portion 11 is supported by the first connecting frame portion 4A so that the placement surface 14 is disposed substantially horizontally when the substrate portion 2 is placed on the bed installation surface 35. Yes.

  As shown in FIGS. 1 and 2, the load detector 1 is configured such that the leg portion of the bed 30 on the placement surface 14 of the cantilever portion 11 in a state where the substrate portion 2 is placed on the bed installation surface 35. By placing 31, the load applied to the leg portion 31 of the bed 30 is detected as the load applied to the bed 30.

  As shown in FIG. 6, the stop portion 9 abuts against the stop portion 9 in the middle of the downward movement of the load receiving plate portion 13 when an excessive load C is applied to the mounting surface 14, thereby causing the load receiving plate portion 13. Is to stop the downward displacement. In the load detector 1 of the first embodiment, the second connection frame portion 4B of the substrate portion 2 functions as the stop portion 9.

  Next, the usage method and operation | movement of the load detector 1 are demonstrated below.

  In a state in which the substrate portion 2 of the load detector 1 is placed on the bed installation surface 35 (see FIG. 5), the load receiving plate portion 13 is spaced apart from the bed installation surface 35 as described above. Further, the load receiving plate portion 13 is arranged at a position slightly spaced upward from the second connecting frame portion 4B of the substrate portion 2. Furthermore, the mounting surface 14 is disposed substantially horizontally.

  The stroke of the load receiving plate 13 that can be displaced downward is the height of the upper surface of the second connecting frame 4B of the substrate 2 placed on the bed installation surface 35 (that is, the thickness of the second connecting frame 4B). ).

  Next, the corresponding leg portion 31 of the bed 30 is placed on the placement surface 14 of each load detector 1. Then, a downward load is applied to the mounting surface 14 from the leg portion 31 of the bed 30, and the load receiving plate portion 13 is cantilevered so as to be displaced downward between the side frame portions 3 and 3 of the substrate portion 2 by this load. The beam 11 is elastically bent slightly. As a result, a strain is generated in the expected strain generation portion 18 of the cantilever portion 11, and this strain is detected by the strain detection sensor 19.

  The strain detection sensor 19 that has detected the strain uses a voltage corresponding to the detected strain magnitude as a signal output from the strain detection sensor 19 to a load calculation unit (not shown) provided in the load detector 1. Output. The load calculation unit calculates (detects) a load applied to the leg portion 31 of the bed 30 based on the voltage output from the strain detection sensor 19. The calculated (detected) load is transmitted as a signal transmitted from the load detector 1 from the load detector 1 to the calculator 21 by a predetermined communication means (eg, wireless communication means) (see FIG. 1). ).

  The computing unit 21 includes a computer having a RAM, a ROM, other memory, a CPU, and the like, and computes the occupancy status of the user 40 on the bed 30 based on a signal transmitted from each load detector 1. (Measure). The computer is installed with a program for calculating (measuring) the presence of the user 40.

  Here, in the first embodiment, the load detector 1 includes the load calculation unit. However, in the present invention, the load detector 1 does not include the load calculation unit, and the calculator 21 is not included in the load calculation unit. May be provided. In this case, the strain detection sensor 19 that has detected the strain in each load detector 1 uses the voltage corresponding to the detected strain magnitude as a signal output from the strain detection sensor 19 to the load calculation unit of the calculator 21. Send. The computing unit 21 computes (measures) the occupancy status of the user 40 on the bed 30 based on the voltage transmitted from the strain detection sensor 19 of each load detector 1 as a signal transmitted from each load detector 1. ).

  The case where the computing unit 21 calculates that the user 40 has entered the bed 30 as the user's 40 presence status is briefly described below. The computing unit 21 calculates a total load obtained by summing up the loads applied to the leg portions 31 of the bed 30 based on a signal (load or voltage) transmitted from each load detector 1, and the total load is less than a predetermined threshold value. Is larger, it is calculated that the user 40 has entered the bed 30.

  In the load detector 1 of the first embodiment, as shown in FIG. 6, when an excessive downward load C exceeding the rated load of the load detector 1 is applied to the mounting surface 14, the load receiving plate portion 13 ( More specifically, the lower surface 13a of the load receiving plate 13 is displaced downward between the side frame portions 3 and 3 of the substrate portion 2, and the second connection frame portion 4B of the substrate portion 2 (more specifically, the second connection frame). The upper surface of the portion 4B), and thereby the downward displacement of the load receiving plate portion 13 is stopped. As a result, plastic deformation of the cantilever portion 11 is prevented.

  Therefore, even when an excessive load C is applied to the mounting surface 14, excessive downward displacement of the load receiving plate portion 13 is restricted by the second connecting frame portion 4B so that the cantilever portion 11 is not plastically deformed. The damage of the load detector 1 is suppressed.

  Furthermore, according to the load detector 1 of the first embodiment, since the board portion 2 includes the side frame portions 3 and 3 and the first and second connection frame portions 4A and 4B, it has high rigidity. Yes. Therefore, the substrate part 2 can firmly support the cantilever part 11. Moreover, since the second connecting frame portion 4B functions as the stop portion 9, it is not necessary to provide a separate stop portion for the load detector 1, and the structure of the load detector 1 can be simplified.

  Thus, the 2nd connection frame part 4B is a role which raises the rigidity of the board | substrate part 2 so that the board | substrate part 2 can support the cantilever part 11 firmly, and a role which stops the downward displacement of the load receiving plate part 13. FIG. It combines with.

  FIG. 7 is a diagram illustrating the bed load detector 101 according to the second embodiment of the present invention. In FIG. 7, the element of the load detector 101 of the second embodiment, which has the same action as the element of the load detector 1 of the first embodiment, is the same as the element of the load detector 1 of the first embodiment. The same reference numerals as those attached are used.

  In the load detector 101 according to the second embodiment, the substrate unit 2 does not include the second connection frame unit (4B, see FIG. 6).

  In the load detector 101 of the second embodiment, when an excessive downward load C exceeding the rated load of the load detector 1 is applied to the placement surface 14, the load receiving plate portion 13 (more specifically, the load receiving plate portion). 13 on the lower surface 13a of the base plate 13 abuts against the bed setting surface 35 while being displaced downward between the side frame portions 3 and 3 of the base plate portion 2, thereby stopping the downward displacement of the load receiving plate portion 13. . As a result, plastic deformation of the cantilever portion 11 is prevented.

  Therefore, even when an excessive load C is applied to the mounting surface 14, the excessive downward displacement of the load receiving plate portion 13 is restricted by the bed installation surface 35 so that the cantilever portion 11 is not plastically deformed. Damage to the detector 101 is suppressed.

  Although several embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used in a bed load detector that is used in a medical facility, a nursing facility, an accommodation facility, a general household, and the like and detects a load applied to the bed.

DESCRIPTION OF SYMBOLS 1, 101: Load detector 2: Board | substrate part 3: Side frame part 4A: 1st connection frame part 4B: 2nd connection frame part
9: Stop portion 11: Cantilever portion 13: Load receiving plate portion 14: Placement surface 19: Strain detection sensor 30: Bed 31: Bed leg portion 35: Bed installation surface 40: User

Claims (3)

A cantilever portion in which a load receiving plate portion having a placement surface on which a leg portion of the bed is placed is formed on the distal end side;
A substrate part placed on the bed installation surface and supporting the cantilever part;
A strain detection sensor that detects a strain of the cantilever portion and outputs a signal used to detect a load applied to the bed;
A stop, and
The cantilever portion is disposed on the substrate portion so that the load receiving plate portion is disposed at a position spaced upward from the bed installation surface and the load receiving plate portion can be displaced downward. Supported in a cantilevered manner,
The mounting surface is formed on the upper surface of the load receiving plate part,
The stop portion stops the downward displacement of the load receiving plate portion by striking the stop portion while the load receiving plate portion is displaced downward when an excessive load is applied to the mounting surface. A load detector for a bed. The substrate portion includes a pair of side frame portions spaced apart from each other, a first connection frame portion that connects one end portions of the both side frame portions, and the other end portions of the both side frame portions. A second connecting frame portion connected,
The cantilever portion is arranged such that the load receiving plate portion is spaced apart from the second connection frame portion of the substrate portion and the load receiving plate portions are on both sides of the substrate portion. The first connecting frame portion of the substrate portion is supported in a cantilever manner so as to be able to move downward between the frame portions,
The bed load detector according to claim 1, wherein the second connection frame portion of the substrate portion functions as the stop portion. A cantilever portion in which a load receiving plate portion having a placement surface on which a leg portion of the bed is placed is formed on the distal end side;
A substrate part placed on the bed installation surface and supporting the cantilever part;
A strain detection sensor that detects a strain of the cantilever portion and outputs a signal used to detect a load applied to the bed,
The cantilever portion is arranged on the substrate portion so that the load receiving plate portion is disposed at a position spaced upward from the bed installation surface and the load receiving plate portion can be displaced downward. Supported in a cantilevered manner,
The mounting surface is formed on the upper surface of the load receiving plate part,
When an excessive load is applied to the mounting surface, the load receiving plate portion is configured to stop the downward displacement of the load receiving plate portion by striking the bed installation surface while the load receiving plate portion is moving downward. Bed load detector.

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