Bed load detector and bed occupancy status measuring device

Abstract

To provide a bed load detector capable of being downsized.SOLUTION: A load detector 1 includes: a load detector body 2 which has a load receiving surface 2a and detects load on a bed moving caster mounted on the load receiving surface 2a in the state that it is mounted on a floor surface; a slope part 11 which is arranged on a front side of the load receiving surface 2a and guides the caster from the floor surface to the load receiving surface 2a; and a stopper wall part 6 which is arranged on a rear side of the load receiving surface 2a and stops traveling of the caster that has arrived on the load receiving surface 2a from the floor surface. At least either the slope part 11 or the stopper wall part 6 is separably configured with respect to the load detector body 2 in the state that the caster is mounted on the load receiving surface 2a.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a bed load detector and a bed occupancy status measuring device that are used in medical facilities, nursing homes, accommodation facilities, ordinary homes, etc. and detect the load applied to the legs of a bed. [Background technology]

[0002] 11, a bed occupancy status measuring device for a bed 130 that measures the occupancy status (e.g., getting in bed, getting out of bed, sitting up) of a user (e.g., a sick person, an elderly person, a person receiving care, an infant) U using the bed 130 includes four bed load detectors 101 that detect the load applied to casters 132 provided at the lower end of each leg 131 of the bed 130, and is configured to measure the occupancy status of the user U based on the load value detected by these load detectors 101. For example, the load detectors 101 disclosed in Patent Document 1 are known.

[0003] This load detector 101 is used by being placed on a floor surface 135 on which a bed 130 is placed, and is equipped with a load detector main body having a load receiving surface 102a on which casters 132 of the bed 130 are placed, and is configured so that the load acting on the casters 132 when the casters 132 are placed on the load receiving surface 102a is detected by the load detector main body.

[0004] Furthermore, a slope section 111 that guides the caster 132 from the floor surface 135 onto the load receiving surface 102a is provided on the front side of the load receiving surface 102a of this load detector 101, and a stopper wall section 106 that stops the movement of the caster 132 that has passed over the slope section 111 from the floor surface 135 and reached the load receiving surface 102a is provided on the rear side of the load receiving surface 102a. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2007-167492 A Summary of the Invention [Problem to be solved by the invention]

[0006] According to the above-mentioned load detector 101, in order to prevent the toes of the user U from hitting the load detector 101 when the user U gets on or off the bed 130, and to prevent the toes of the worker (caregiver, doctor, nurse, etc.) from hitting the load detector 101 when providing care (including assistance), examining, treating, etc. to the user U on the bed 130, it is desirable for the size (size) of the load detector 101 to be as small as possible.

[0007] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, an object of the present invention is to provide a bed load detector that can be made smaller in size, and a bed occupancy status measuring device equipped with the same. [Means for solving the problem]

[0008] The present invention provides the following means.

[0009] 1) A load detector body having a load receiving surface and placed on a floor surface to detect a load applied to a caster for moving a bed placed on the load receiving surface; A slope portion that is disposed in front of the load receiving surface and guides the caster from the floor surface onto the load receiving surface; A stopper wall portion is disposed on the rear side of the load receiving surface and stops the travel of the caster that has reached the load receiving surface from the floor surface, A load detector for a bed, wherein at least one of the slope portion and the stopper wall portion is configured to be separable from the load detector main body when the caster is placed on the load receiving surface.

[0010] 2) A load detector for a bed as described in paragraph 1 above, wherein both the slope portion and the stopper wall portion are configured to be separable from the load detector body when the caster is placed on the load receiving surface.

[0011] 3) A pair of left and right caster fall prevention walls are disposed on both left and right sides of the load bearing surface at a distance from each other at both left and right ends of the stopper wall, and thus an outer frame body that is generally U-shaped in plan view and opens forward and is made up of the stopper wall and both the caster fall prevention walls, The outer frame has an inner space in which the load detector body is housed so as to be removably mounted, An upwardly protruding engagement protrusion is provided at the front end of each of the caster fall prevention wall portions of the outer frame body, A downwardly opening engagement recess is provided at a rear end of the slope portion, A load detector for a bed as described in paragraph 2, wherein the slope portion is configured to be separably assembled to the front end portions of both caster fall prevention wall portions by the engagement recess portion engaging with the engagement protrusion portion in the front-rear direction in a detachable manner.

[0012] 4) A slide groove portion is provided on each of the inner surfaces of the caster fall prevention wall portions of the outer frame body, the slide groove portion extending rearward from the front end of each of the inner surfaces of the caster fall prevention wall portions facing each other, A load detector for a bed as described in paragraph 3 above, wherein the slide groove portions are configured so that both left and right end portions of the load detector main body can slide within the slide groove portions from their front ends in a rearward direction and in the opposite direction.

[0013] 5) The cross-sectional shape of each of the slide groove portions is substantially U-shaped and opens inward, A load detector for a bed as described in paragraph 4 above, wherein the two slide groove portions are configured so that both side ends of the load detector main body are held within the two slide groove portions so that the load detector main body housed in the inner space of the outer frame body does not fall from the inner space.

[0014] 6) A bed occupancy status measuring device comprising a bed load detector according to any one of items 1 to 5 above. Effect of the Invention

[0015] The present invention provides the following advantages.

[0016] In the preceding paragraph 1, at least one of the slope portion and the stopper wall portion of the load detector is configured to be separable from the load detector main body when the caster of the bed is placed on the load receiving surface. Therefore, by separating at least one of the slope portion and the stopper wall portion from the load detector main body after the caster is placed on the load receiving surface, the load detector can be made smaller in size.

[0017] In the preceding paragraph 2, both the slope portion and the stopper wall portion are configured to be separable from the load detector main body when the caster is placed on the load receiving surface. Therefore, by separating both the slope portion and the stopper wall portion from the load detector main body after the caster is placed on the load receiving surface, it is possible to reliably reduce the size of the load detection portion.

[0018] In the preceding paragraph 3, a pair of caster fall prevention wall portions are integrally provided at the left and right ends of the stopper wall portion, spaced apart from each other on both the left and right sides of the load-receiving surface, so that the caster fall prevention wall portions can prevent the casters from falling from the left and right sides of the load-receiving surface when the casters are placed on the load-receiving surface.

[0019] Furthermore, the slope portion is configured so that it can be separably assembled to the front ends of both caster fall prevention wall portions by engaging the engaging recesses at the rear end of the slope portion in the front-to-rear direction and releasably engaging with the engaging protrusions at the front ends of both caster fall prevention wall portions of the outer frame body.This means that the slope portion can be reliably and easily assembled to both caster fall prevention wall portions and separated from both caster fall prevention wall portions.

[0020] In the preceding paragraph 4, the two sliding groove portions of the two caster fall prevention walls of the outer frame body are configured so that the left and right side end portions of the load detector main body can slide within the two sliding groove portions from their front ends in the rear direction and in the opposite direction, thereby making it easy to insert the load detector main body into the inner space of the outer frame body and to remove it from it.

[0021] In the above paragraph 5, the load detector body housed in the inner space of the outer frame body can be prevented from falling out of the inner space, and therefore the load detector can be easily placed on the floor surface.

[0022] In the above item 6, it is possible to provide a bed occupancy status measuring device capable of achieving the above-mentioned effects described in any one of the above items 1 to 5. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a schematic diagram showing a bed occupancy status measuring device equipped with a bed load detector according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view of the load detector. [Diagram 3] FIG. 3 is a plan view of the load detector. [Figure 4] FIG. 4 is a rear view of the load detector. [Diagram 5] FIG. 5 is a vertical sectional view of the load detector. [Figure 6] FIG. 6 is an exploded perspective view of the load detector. [Figure 7A] FIG. 7A is a perspective view of an outer frame of the load detector. [Figure 7B] FIG. 7B is a perspective view of the outer frame and the load detector body, showing a state in which the load detector body is being housed in the inner space of the outer frame. [Figure 7C] FIG. 7C is a plan view of the outer frame and the load detector in the state shown in FIG. 7B. [Figure 7D] FIG. 7D is an enlarged cross-sectional view taken along line AA in FIG. 7C. [Figure 8] 4A to 4C are explanatory diagrams of an assembly procedure for the load detector. [Figure 9] FIG. 9 is a perspective view showing a state in which the load detector detects a load applied to a caster of a bed. [Figure 10] FIG. 10 is a vertical sectional view of the load detector body showing a state in which the outer frame and the slope portion of the load detector are separated from the load detector body. [Figure 11]FIG. 11 is a perspective view showing a state in which a load applied to a caster of a bed is detected by a conventional load detector for a bed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] An embodiment of the present invention will be described below with reference to the drawings.

[0025] As shown in Figure 9, a load detector 1 for a bed 30 in one embodiment of the present invention is used in a bed occupancy status measuring device 20 for a bed 30 (hereinafter simply referred to as the "measuring device 20") that measures the occupancy status (e.g., getting into bed, getting out of bed, sitting up) of a user U using the bed 30.

[0026] The bed 30 is used in medical facilities (e.g., hospitals), nursing homes, accommodation facilities (e.g., hotels), general homes, etc., and is formed into a substantially rectangular shape in a plan view. Furthermore, the bed 30 is used by being placed on a substantially flat floor surface 35 in a patient room, examination room, treatment room, bedroom, accommodation room, etc.

[0027] On the bed 30, users U, such as sick people, elderly people, people receiving care, infants, guests, etc., occupy various positions (e.g., supine, prone, lateral, sitting on the edge of the bed) for sleeping, examination (including testing), treatment, etc.

[0028] The bed 30 has a plurality of legs, namely, four legs 31. The lower end of each leg 31 is provided with a rotatable caster 32 (called a "bed moving caster 32") that runs on a floor surface 35 when the bed 30 is moved.

[0029] As shown in Fig. 1, the measurement device 20 includes four load detectors 1 of this embodiment, and these load detectors 1 have the same configuration. Furthermore, the measurement device 20 includes a computing unit 21, a controller 23, etc. Note that the computing unit 21, the controller 23, and cables are omitted from Fig. 9.

[0030] As shown in FIGS. 2 to 4, each load detector 1 includes a load detector body 2, a slope portion 11, a stopper wall portion 6, and the like.

[0031] The load detector main body 2 is intended to be placed on a floor surface 35 (see Figure 9) when in use, and as shown in Figures 2 to 4, has a load-receiving surface 2a on which the casters 32 of the bed 30 are placed, and detects the load acting on the casters 32 placed on this load-receiving surface 2a.

[0032] The slope section 11 is disposed near the front side of the load-receiving surface 2a and guides the casters 32 from the floor surface 35 onto the load-receiving surface 2a. The upper surface of the slope section 11 is formed in an upward slope (inclined surface) in the direction in which the casters 32 run from the floor surface 35 onto the load-receiving surface 2a. The slope section 11 is made of metal (e.g., aluminum alloy).

[0033] The stopper wall portion 6 is disposed near the rear side of the load receiving surface 2a and serves to stop the movement of the caster 32 that has passed over the slope portion 11 from the floor surface 35 and reached the load receiving surface 2a. Therefore, the height of the stopper wall portion 6 is higher than that of the load receiving surface 2a.

[0034] A pair of caster fall prevention walls 7, 7 are integrally formed at both left and right ends of the stopper wall 6, extending forward from the both ends and disposed spaced apart from each other on both left and right sides of the load receiving surface 2a, thereby forming an outer frame 5 that is roughly U-shaped in plan view and opens forward and is made up of the stopper wall 6 and both caster fall prevention walls 7, 7. The outer frame 5 is made of metal (for example, aluminum alloy).

[0035] Each caster fall prevention wall portion 7 prevents the caster 32 from falling from the left and right sides of the load receiving surface 2a when the caster 32 is placed on the load receiving surface 2a. Therefore, the height of each caster fall prevention wall portion 7 is higher than the load receiving surface 2a.

[0036] In this embodiment, as shown in Figs. 2 to 4, the front-rear direction of the load detector 1 is the direction in which the casters 32 run (move) when they are placed from the floor surface 35 onto the load receiving surface 2a.

[0037] When the caster 32 is placed on the load receiving surface 2a from the floor surface 35, the caster 32 on the floor surface 35 passes over the slope portion 11 from the front side of the load detector 1 toward the load receiving surface 2a. Then, when the caster 32 reaches the load receiving surface 2a (more specifically, the appropriate load detection position on the load receiving surface 2a), the caster 32 hits the stopper wall portion 6 as shown in FIG. 5 and is stopped, and the caster 32 is placed on the load receiving surface 2a.

[0038] The load detector body 2 is, for example, of a load cell type. Specifically, the load detector body 2 has a substantially plate-shaped or short rectangular parallelepiped flexure body 4 made of metal (e.g., aluminum alloy), a strain detection sensor (not shown), etc. The load receiving surface 2a is formed on the upper surface of the flexure body 4.

[0039] The strain detection sensor detects the strain (including its fluctuation) generated in the strain body 4, and outputs an electric signal (e.g., voltage) corresponding to the magnitude of the detected strain as the load applied to the caster 32 or a signal used to detect the load. Specifically, the strain detection sensor is composed of a strain gauge attached to the strain body 4, a piezoelectric film sensor, or the like.

[0040] As shown in FIG. 1, in the measurement device 20, an electrical signal output from the load detector main body 2 of each load detector 1 (more specifically, the strain detection sensor of the load detector main body 2) is transmitted to a calculator 21 via a signal cable 24.

[0041] The calculator 21 calculates the bed occupancy status of the user U on the bed 30 based on the transmitted electrical signal, and is equipped with an A / D converter, a computer, an external output terminal, etc. The computer has a CPU, a memory unit (ROM, etc.), etc., and executes a predetermined program for calculating the bed occupancy status of the user U. Bprogram is installed on your computer.

[0042] In addition, the reference numeral "22" in the figure denotes a power supply cable to the computing unit 21, and an AC adapter 22a is provided at the tip of the power supply cable.

[0043] In the computing unit 21, the electrical signal transmitted from the load detector body 2 is converted from an analog signal to a digital signal by the A / D conversion unit, and then the computer processes the signal. B The bed occupancy status of user U is calculated according to the gram.

[0044] The controller 23 controls the operation of the calculator 21. Furthermore, the controller 23 has a display unit (for example, a liquid crystal display unit), and the bed occupancy status of the user U is displayed on this display unit.

[0045] 6, in the present embodiment, the load detector 1 is configured so that both the slope portion 11 and the outer frame 5 (the stopper wall portion 6 and the caster fall prevention walls 7, 7) are separable from the load detector main body 2. This configuration will be described below.

[0046] As described above, the outer frame body 5 is roughly U-shaped when viewed from above, and the load detector main body 2 is removably housed in its inner space 10; in other words, the inner space 10 of the outer frame body 5 is used as a housing chamber for the load detector main body 2.

[0047] The outer frame body 5 is formed symmetrically, and a slide groove portion 8 extending from the front end to the rear direction is provided on the inner surfaces of both caster fall prevention walls 7, 7 of the outer frame body 5 that face each other. Both slide groove portions 8, 8 are configured so that both left and right side end portions 3, 3 of the load detector main body 2 can slide in both slide groove portions 8, 8 from the front end to the rear direction and the opposite direction, and further, the both left and right side end portions 3, 3 of the load detector main body 2 are held in both slide groove portions 8, 8 so that the load detector main body 2 accommodated in the inner space 10 of the outer frame body 5 does not fall from the inner space 10.

[0048] Specifically, the upper and lower ends of the inner surface of each caster fall prevention wall portion 7 are provided with upper protrusions 8a and lower protrusions 8b that protrude inward, respectively, thereby forming the above-mentioned slide groove portion 8, which has an approximately C-shaped cross section and opens inward, between the upper protrusions 8a and lower protrusions 8b on the inner surface.

[0049] A notched recess 3a having a substantially L-shaped cross section extending in the front-rear direction is provided on the lower edge of each of the left and right side end portions 3, 3 of the load detector main body 2. Then, as shown in Figures 7A to 7D, when the left and right side end portions 3, 3 of the load detector main body 2 are slidably inserted into the slide groove portions 8, 8 from the front side between the caster fall prevention walls 7, 7 of the outer frame body 5 (i.e., the inner space 10 of the outer frame body 5), the left and right lower protrusions 8b, 8b are inserted into the notched recesses 3a, 3a, and thereby the left and right side end portions 3, 3 of the load detector main body 2 are received by the lower protrusions 8b, 8b from below.

[0050] In this state, the both side end portions 3, 3 of the load detector main body 2 are slid rearward along the both slide groove portions 8, 8 relative to the outer frame body 5 within the both slide groove portions 8, 8, so that the load detector main body 2 is accommodated in the inner space 10 of the outer frame body 5, and the both side end portions 3, 3 of the load detector main body 2 are held within the both slide groove portions 8, 8 in a state in which the both side end portions 3, 3 of the load detector main body 2 are supported by the both lower protrusions 8b, 8b so that the load detector main body 2 does not fall from the inner space 10.

[0051] As shown in Fig. 6, upwardly protruding engagement protrusions 9, 9 are formed integrally with the front ends of both caster fall prevention walls 7, 7 of the outer frame body 5. A downwardly opening engagement recess 12 is formed extending in the left-right direction at the rear end of the slope portion 11. The engagement recess 12 engages with both engagement protrusions 9, 9 in the front-rear direction and in a detachable manner, whereby the slope portion 11 is separably assembled to the front ends of both caster fall prevention walls 7, 7.

[0052] In addition, the reference symbol "5a" in FIG. 4 denotes an insertion hole for the signal cable 24 provided on the rear surface of the outer frame 5.

[0053] When assembling the load detector 1, first, the load detector main body 2 is housed in the inner space 10 of the outer frame 5, as shown in Fig. 8. Next, the engaging recess 12 of the slope portion 11 is engaged with the engaging protrusions 9, 9 of the caster fall prevention walls 7, 7 of the outer frame 5, thereby assembling the slope portion 11 to the front end portions of the caster fall prevention walls 7, 7 so that the slope portion 11 does not move in the front-rear direction relative to the outer frame 5. In this way, the load detector 1 is assembled.

[0054] As a method of engaging the engagement recess 12 with both engagement protrusions 9, 9, as shown in the same figure, the engagement recess 12 may be engaged with both engagement protrusions 9, 9 by sliding the engagement recess 12 relatively to the left or right relative to the engagement protrusion 9 so that the engagement protrusion 9 is inserted into the engagement recess 12 from the side, or the engagement recess 12 may be engaged with both engagement protrusions 9, 9 by covering the engagement recess 12 with both engagement protrusions 9, 9 from above.

[0055] When the load applied to the casters 32 of the bed 30 is detected by the load detector 1, the four load detectors 1 assembled in the above-mentioned procedure are placed on the floor surface 35 at intervals of the four casters 32 of the bed 30, as in the conventional method (see FIG. 9). At this time, the load detector body 2 housed in the inner space 10 of the outer frame body 5 of the load detector 1 is held in the slide grooves 8 on both sides 3, 3 of the load detector body 2 in order not to fall from the inner space 10 as described above, so that the load detector 1 can be easily placed on the floor surface 35. Note that when the load detector 1 is placed on the floor surface 35, the load detector body 2 of the load detector 1 is placed on the floor surface 35 in contact with the floor surface 35.

[0056] Next, the casters 32 of the bed 30 are caused to travel from the floor surface 35 over the slope portion 11 of the load detector 1 toward the load receiving surface 2a. When the casters 32 reach the load receiving surface 2a, they collide with the stopper wall portion 6 of the load detector 1 and stop. As a result, the casters 32 are placed on the load receiving surface 2a as shown in FIG. 5.

[0057] In this state, the load applied to the caster 32 may be detected by the load detector main body 2; however, in this embodiment, in order to reduce the size (dimension) of the load detector 1, as shown in Figures 9 and 10, both the slope portion 11 and the outer frame body 5 are separated from the load detector main body 2, and the load applied to the caster 32 in this state is detected by the load detector main body 2.

[0058] That is, while the caster 32 is placed on the load receiving surface 2a of the load detector main body 2 (see FIG. 5), the engagement recess 12 of the slope portion 11 is slightly lifted upward or the engagement recess 12 of the slope portion 11 is slid leftward or rightward to release the engagement between the engagement recess 12 and the engagement protrusions 9, 9 of both caster fall prevention walls 7, 7 of the outer frame 5. This separates the slope portion 11 from the front ends of both caster fall prevention walls 7, 7 (load detector main body 2).

[0059] Next, the outer frame body 5 is pulled backward. Then, both side ends 3, 3 of the load detector main body 2 slide forward relative to the outer frame body 5 within both slide grooves 8, 8 of both caster fall prevention walls 7, 7 of the outer frame body 5, and the load detector main body 2 is taken out from the inner space 10 of the outer frame body 2. This separates the outer frame body 2 from the load detector main body 2.

[0060] In this state, as shown in Figures 9 and 10, there is no slope portion 11 and outer frame body 5 on the outer periphery of the load detector main body 2, so that it is possible to prevent the user U's toes from hitting the load detector main body 2 when getting on and off the bed 30, and it is also possible to prevent the worker's toes from hitting the load detector main body 2 or the load detector main body 2 from interfering with the work when providing care, examination, treatment, etc. to the user U on the bed 30.

[0061] Here, in Figure 9, the slope portion 11 and the outer frame body 5 are separated for all four load detectors 1, but the present invention is not limited to this, and the slope portion 11 and the outer frame body 5 may be separated only for load detectors at necessary locations among the four load detectors 1 (for example, load detectors that are likely to be hit by the toes of a user U or a worker).

[0062] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

[0063] For example, in the above embodiment, both the slope portion 11 and the stopper wall portion 6 of the load detector 1 are separable from the load detector main body 2, but in the present invention, it is also possible that only one of the slope portion and the stopper wall portion is separable from the load detector main body. [Industrial Applicability]

[0064] INDUSTRIAL APPLICABILITY The present invention can be used in a bed load detector that detects the load applied to the legs of a bed and a bed occupancy status measuring device that are used in medical facilities, nursing homes, accommodation facilities, general homes, etc. [Explanation of symbols]

[0065] 1: Load detector 2: Load detector body 2a: Load bearing surface 3: Side end of the load detector body 5: Outer frame 6: Stopper wall 7: Caster fall prevention wall 8: Slide groove 9: Engagement convex part 10: Space inside the outer frame 11: Slope section 12: Engagement recess 30: Bed 32: Caster 35:Floor

Claims

1. a load detector body having a load receiving surface and placed on a floor surface to detect a load applied to a caster for moving a bed placed on the load receiving surface; A slope portion that is disposed in front of the load receiving surface and guides the caster from the floor surface onto the load receiving surface; A stopper wall portion is disposed on the rear side of the load receiving surface and stops the travel of the caster that has reached the load receiving surface from the floor surface, Both the slope portion and the stopper wall portion are configured to be separable from the load detector body in a state in which the caster is placed on the load receiving surface, A pair of left and right caster fall prevention walls are integrally provided at both left and right ends of the stopper wall portion, spaced apart from each other on both left and right sides of the load bearing surface, thereby forming an outer frame body that is roughly U-shaped in plan view and opens forward and is composed of the stopper wall portion and both caster fall prevention walls, The outer frame has an inner space in which the load detector body is housed so as to be removably mounted, An upwardly protruding engagement protrusion is provided at the front end of each of the caster fall prevention wall portions of the outer frame body, A downwardly opening engagement recess is provided at a rear end of the slope portion, The load detector for a bed is configured so that the slope portion can be detachably assembled to the front end portions of both caster fall prevention wall portions by the engagement recess portion engaging with the engagement protrusion portion in the front-rear direction in a detachable manner.

2. A slide groove portion extending rearward from the front end of each of the inner surfaces of the caster fall prevention wall portions of the outer frame body facing each other is provided, The load detector for a bed as described in claim 1, wherein the slide groove portions are configured so that the left and right end portions of the load detector main body can slide within the slide groove portions from their front ends in a rearward direction and in the opposite direction.

3. a load detector body having a load receiving surface and placed on a floor surface to detect a load applied to a caster for moving a bed placed on the load receiving surface; A slope portion that is disposed in front of the load receiving surface and guides the caster from the floor surface onto the load receiving surface; A stopper wall portion is disposed on the rear side of the load receiving surface and stops the travel of the caster that has reached the load receiving surface from the floor surface, Both the slope portion and the stopper wall portion are configured to be separable from the load detector body in a state in which the caster is placed on the load receiving surface, A pair of left and right caster fall prevention walls are integrally provided at both left and right ends of the stopper wall portion, spaced apart from each other on both left and right sides of the load bearing surface, thereby forming an outer frame body that is roughly U-shaped in plan view and opens forward and is composed of the stopper wall portion and both caster fall prevention walls, The outer frame has an inner space in which the load detector body is housed so as to be removably mounted, The slope portion is configured to be separably assembled to the front end portions of the caster fall prevention wall portions, A slide groove portion extending rearward from the front end of each of the inner surfaces of the caster fall prevention wall portions of the outer frame body facing each other is provided, The two slide groove portions are configured so that the left and right end portions of the load detector body can slide within the two slide groove portions from their front ends in a rearward direction and in the opposite direction.

4. The cross-sectional shape of each of the slide groove portions is substantially U-shaped and opens inward, A load detector for a bed as described in claim 2 or 3, wherein both slide groove portions are configured so that both side ends of the load detector main body housed in the inner space of the outer frame body are held within the both slide groove portions so that the load detector main body does not fall from the inner space.

5. A bed occupancy status measuring device comprising the bed load detector according to any one of claims 1 to 4.

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