Bathing assistance chair device

Abstract

To provide a bathing assistance chair device dispensing with a high waterproof treatment, and while preventing electric shock, capable of securing safety by detecting overload.SOLUTION: A load receiving member 31 is provided on a bottom part of a lift drive unit 20 for lifting a chair 10 of a bathing assistance chair device 3. Transfer guides 33 on both ends of the load receiving member 31 transferrably have a contact with a carry rail 4 and a stile top rail 5a. The load receiving member 31 is provided with a distortion sensor 41. A determination part 42 determines whether an overload exists or not, based on a detection value by the distortion sensor 41.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a bathing assistance chair device used for assisting a person who requires assistance in bathing. In particular, it relates to a bathing assistance chair device that can be transferred from a mobile carrier to a rail on the bathtub frame and placed in the bathtub, or lifted from the bathtub and returned to the carrier.

Background Art

[0002] A chair device for seating a person who requires assistance and used for bathing assistance is known (see Patent Documents 1, 2, etc.). In the chair devices of Patent Documents 1 and 2, a lifting drive unit is provided on the back of the backrest of the chair. The chair is supported by the carrier by mounting the lifting drive unit on the carrier rail of the carrier. The chair is lifted and lowered by the lifting drive unit.

[0003] During bathing assistance, the carrier rail is connected in a straight line to the rail on the bathtub frame installed on the bathtub frame. Then, the chair is moved onto the bathtub by sliding the lifting drive unit from the carrier rail to the rail on the bathtub frame. Subsequently, the chair is lowered by the lifting drive unit. As a result, the person who requires assistance can be bathed while seated. After bathing, the person who requires assistance is taken out of the bathtub by the reverse operation.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In this type of bathing assistance chair device, it is possible that the chair may be subjected to loads exceeding its weight capacity due to the user's weight being too heavy, or that excessive external forces or impacts may be applied to the seat. Conventionally, the design and manufacture ensured strength by adding a safety factor to the load capacity. On the other hand, making the product more robust tends to increase its weight, which reduces its operability.

[0006] It is conceivable to detect overload by installing sensors on the chair. However, since the chair will be placed in the bathtub and submerged in water, the sensors and electrical wiring will need to be highly waterproofed, and there is also a risk of electric shock. In view of these circumstances, the present invention aims to provide a bathing assistance chair device that does not require high-level waterproofing, prevents electric shock, ensures safety by detecting overload, and prevents damage to the equipment. [Means for solving the problem]

[0007] To solve the aforementioned problems, the present invention provides a bathing assistance chair device that is supported so as to be able to transfer between a carrier rail of a carrier and a rail installed on the edge of a bathtub, A chair having a seat and a backrest, A lifting drive unit is mounted on the aforementioned carry rail and the aforementioned frame rail so as to be transferable, and is engaged with the backrest so as to be vertically slidable to raise and lower the chair, A load-receiving member provided at the bottom of the aforementioned lifting drive unit, A transfer guide is provided on the load-receiving member and is guided in contact with the carry rail and the frame rail, A strain sensor is provided on the load-receiving member, A determination unit that determines whether or not an overload is present based on the value detected by the strain sensor, It is characterized by having the following features.

[0008] When a load is applied to the chair, that load is transmitted to the lifting drive unit and then transferred to the carry rail or frame rail via the load-receiving member and transfer guide at the bottom of the lifting drive unit. The load-receiving member undergoes deformation corresponding to the load. This is detected by a strain sensor, and a determination unit determines whether or not it is overloaded. If it is determined to be overloaded, the safety of the user is ensured and damage to the bathing assistance chair device can be prevented by, for example, notifying the user of the overload with a lamp or buzzer, or by locking the chair to prevent lifting or sliding. Since the load-receiving member is not submerged in water when placed in the bathtub, high waterproofness is not required for the strain sensor, and even if the wiring is accidentally disconnected, the risk of electric shock is low. The determination unit can be integrated into the control board inside the lifting drive unit.

[0009] Preferably, the central portion of the load-receiving member in the longitudinal direction, which is oriented substantially horizontally, is connected to the lifting drive unit via a connecting portion, and the transfer guides are provided at both ends of the load-receiving member in the longitudinal direction. The strain sensors are provided on the upper and lower surfaces of the load-receiving member, respectively. The determination unit performs the determination by summing the detected values ​​from these upper and lower strain sensors. When a load is applied to the bathing assistance chair device, compressive stress acts on the upper surface of the load-bearing member, and tensile stress acts on the lower surface. The detection accuracy is improved by summing the strains caused by these stresses. Preferably, the load-bearing member is rotatable about the connecting portion.

[0010] Preferably, the load-receiving members are provided at both the left and right ends of the bottom of the lifting drive unit, with their longitudinal direction oriented to the left and right. The strain sensor is provided in a portion of the lifting drive unit that is closer to the center in the left-right direction than the connecting portion of each load-bearing member. Typically, the center of the load is located in the left-right direction of the bathing assistance chair device, so placing a strain sensor close to that point increases its sensitivity to load.

[0011] Preferably, the load-receiving member has a cantilevered detection projection, the tip of the detection projection is provided with a contact body that contacts the carry rail and the frame rail, and the strain sensor is provided on the detection projection. Preferably, the detection projection has elasticity. When the load-bearing member is displaced in such a way that it sinks due to the load on the chair, the detection projection bends. This allows the load to be detected.

[0012] Preferably, the load-bearing member has a weight-reducing section. Examples of weight-reducing sections include holes, narrowed sections, recesses, and thinned sections. By providing weight-reducing sections, the load-bearing member becomes more flexible under load, and the sensitivity to load detection is increased. [Effects of the Invention]

[0013] According to the bathing assistance chair device of the present invention, high-level waterproofing treatment of the sensor is unnecessary, and safety can be ensured by detecting overload while preventing electric shock, as well as preventing damage to the device. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 shows a first embodiment of the present invention, where Figure 1(a) is a side view of a bathing wheelchair including a bathing assistance chair device. Figure 1(b) is a perspective view of the bathing wheelchair. [Figure 2] Figure 2 is a plan view of the bathroom with the aforementioned bathing wheelchair and the bathtub-side rail mechanism arranged. [Figure 3] Figure 3(a) is a side view showing the bathing assistance chair device supported on the frame rail of the bathtub-side rail mechanism and positioned above the bathtub. Figure 3(b) is a side view showing the bathing assistance chair device with the chair lowered into the bathtub. [Figure 4] Figure 4(a) is a perspective view of the lifting drive unit of the bathing assistance chair device, viewed from the front. Figure 4(b) is a perspective view of the lifting drive unit, viewed from the rear. [Figure 5]Fig. 5(a) is a plan view of the unit base of the lifting drive unit. Fig. 5(b) is a front view of the unit base. Fig. 5(c) is a perspective view of the unit base. [Figure 6] Fig. 6(a) is a plan view of the receiving mechanism provided on the unit base. Fig. 6(b) is a front view of the receiving mechanism. Fig. 6(c) is a perspective view of the receiving mechanism. [Figure 7] Fig. 7 is a side sectional view showing the state where the bottom of the lifting drive unit including the load detection system is mounted on the carrier rail. [Figure 8] Fig. 8 is a front view explaining the direction of force acting on the receiving mechanism when a load is applied to the chair. [Figure 9] Fig. 9 shows the second embodiment of the present invention. Fig. 9(a) is a bottom view of the receiving mechanism. Fig. 9(b) is a perspective view of the receiving mechanism. [Figure 10] Fig. 10 is a front view of the receiving mechanism according to the second embodiment. [Figure 11] Fig. 11 is a front view of the receiving mechanism according to the third embodiment of the present invention. [Figure 12] Fig. 12 is a front view of the receiving mechanism according to the fourth embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be described according to the drawings. <First Embodiment (Figs. 1 to 8)> Fig. 1 shows the bathing wheelchair 1. As shown in Fig. 1(a), the bathing wheelchair 1 includes a manually movable carrier 2 and a bathing assistance chair device 3. A carrier rail 4 is horizontally provided at the upper end of the carrier 2. The bathing assistance chair device 3 is mounted on the carrier 2 and carried.

[0016] As shown in Figure 2, the bathing wheelchair 1 is used in combination with the bathtub-side rail mechanism 5 to assist person A in bathing. As shown in Figure 3(a), the bathtub-side rail mechanism 5 is installed on the side of the bathtub 7 in the bathroom 6. When the bathtub-side rail mechanism 5 is deployed, its frame rail 5a is positioned horizontally on the bathtub frame 7a. As shown in Figure 2, the frame rail 5a and the carry rail 4 are connected in a straight line. The carry rail 4 and the frame rail 5a are formed with the same concave cross-sectional shape. The bathing assistance chair device 3 can be transferred between the carry rail 4 and the frame rail 5a.

[0017] As shown in Figure 1(b), the bathing assistance chair device 3 comprises a chair 10 and a lifting drive unit 20. The chair 10 has a seat 11 and a backrest 12. The lifting drive unit 20 is provided on the back of the backrest 12. The backrest 12 is engaged with the lifting drive unit 20 so as to be able to slide up and down. A rack 13 extending vertically is provided on the back of the backrest 12. As shown in Figure 4(a), the lifting drive unit 20 is provided with a pinion 21 that meshes with the rack 13. The pinion 21 is rotated by the drive of a motor (not shown) inside the lifting drive unit 20, which causes the backrest 12 and, consequently, the chair 10 to move up and down.

[0018] As shown in Figures 3(a) and 3(b), with the bathing assistance chair device 3 positioned on the rail 5a on the bathtub frame 7a, the chair 10 is raised and lowered, allowing the chair 10 to move in and out of the bathtub 7. This allows the person requiring assistance A to be bathed while remaining seated.

[0019] As shown in Figure 4(b), a unit base 22 extending left and right is provided at the bottom of the lifting drive unit 20. As shown in Figures 5(a) to 5(c), a load-receiving mechanism 30 for receiving the load of the lifting drive unit 20 is provided at both the left and right ends of the unit base 22. As shown in Figures 6(a) to 6(c), the load-receiving mechanism 30 includes a pair of load-receiving members 31 arranged front and rear (up and down in Figure 6(a)), a connecting shaft 32 (connecting part), and a transfer guide roller 33 (transfer guide). The axis of the connecting shaft 32 is oriented in the front-to-back direction (up and down direction in Figure 6(a)). A load-receiving member 31 is provided at both ends of the connecting shaft 32. As shown in Figure 5(a), a total of four load-receiving members 31 are provided on both the front and rear sides at both ends of the unit base 22.

[0020] As shown in Figure 6(c), each load-bearing member 31 is formed in a plate shape perpendicular to the connecting shaft 32. The longitudinal direction of the load-bearing member 31 is approximately horizontal and oriented to the left and right. The central part of the load-bearing member 31 is connected to the end of the connecting shaft 32. As shown in Figure 6(b), the plate portions 34 and 35 on both the left and right sides of the load-bearing member 31, flanking the connecting shaft 32, are each slightly inclined downward toward their ends. As shown in Figure 6(a), transfer guide rollers 33 are rotatably connected to the ends of each plate portion 34 and 35, i.e., both ends of the load-bearing member 31. The axis of rotation of the transfer guide rollers 33 is oriented in the front-rear direction.

[0021] As shown in Figure 5(c), the load-bearing member 31 is connected to the unit base 22 (the bottom of the lifting drive unit 20) via a connecting shaft 32. The load-bearing member 31 is rotatable relative to the unit base 22 around the axis of the connecting shaft 32. This allows it to overcome slight height differences between the carry rail 4 and the frame rail 5a.

[0022] As shown in Figure 7, when the bathing assistance chair device 3 is mounted on the carrier 2 (Figure 1), the unit base 22 and the receiving mechanism 30 are housed inside the groove-shaped interior of the carrier rail 4. The transfer guide roller 33 rests on the bottom plate 4b of the carrier rail 4. The load receiving member 31 is located above the bottom plate 4b and is not in direct contact with the carrier rail 4. The load of the bathing assistance chair device 3 is transferred to the carrier rail 4 via the receiving mechanism 30, which includes the load receiving member 31 and the transfer guide roller 33.

[0023] With the carry rail 4 and the frame rail 5a connected in a straight line (Figure 2), the transfer guide roller 33 can roll along these rails 4 and 5a.

[0024] Although detailed illustrations are omitted, when the bathing assistance chair device 3 is supported by the bathtub-side rail mechanism 5 (Figure 3), the unit base 22 and the receiving mechanism 30 are housed inside the frame rail 5a. The transfer guide roller 33 rests on the bottom plate 5b of the frame rail 5a. The load receiving member 31 is not in direct contact with the frame rail 5a. The load of the bathing assistance chair device 3 is transferred to the frame rail 5a via the receiving mechanism 30, which includes the load receiving member 31 and the transfer guide roller 33.

[0025] As shown in Figure 7, the bathing assistance chair device 3 further includes a load detection system 40. The load detection system 40 includes a strain sensor 41 and a determination unit 42.

[0026] As shown in Figure 5(a), strain sensors 41 are provided on each load-bearing member 31 of the bathing assistance chair device 3. The strain sensors 41 are made up of strain gauges and are attached to the load-bearing member 31 via adhesive. Preferably, as shown in Figure 5(b), the strain sensor 41 is provided on the plate portion 34 of the load-bearing member 31 that faces the center side in the left-right direction of the lifting drive unit 20, among the plate portions 34 and 35 on both sides of the load-bearing member 31. More preferably, as shown in Figure 6(b), strain sensors 41 are provided on the upper and lower surfaces of the plate portion 34, respectively. When distinguishing between these upper and lower strain sensors 41, the one on the upper surface is referred to as strain sensor 41a, and the one on the lower surface is referred to as strain sensor 41b.

[0027] The strain sensor 41a is attached to the upper end surface of the load-receiving member 31, but it may also be attached to the upper side of the side surface of the load-receiving member 31. The strain sensor 41b is attached to the lower end surface of the load-receiving member 31, but it may also be attached to the lower side of the side surface of the load-receiving member 31. These strain sensors 41 are exposed to the outside of the load-receiving member 31, but they may also be embedded inside the load-receiving member 31 so as not to be exposed.

[0028] As shown in Figure 7, lead wires 43 from each strain sensor 41 are connected to a control unit 24 in the lifting drive unit 20. Although not shown in the figure, the control unit 24 is equipped with a Wheatstone bridge circuit that converts minute changes in the resistance value of the strain sensor 41 into voltage changes, and a signal converter that converts its output voltage into a digital strain detection signal.

[0029] Furthermore, the control unit 24 incorporates a determination unit 42 and an overload safety operation unit 44. The determination unit 42 is composed of the CPU of the control unit 24's microcomputer. The determination unit 42 determines whether or not there is an overload on the chair 10 based on the strain detection signal (the value detected by the strain sensor 41). The microcomputer's memory unit stores a program and threshold values ​​for the determination. The threshold values ​​are set considering the load capacity of the chair 10.

[0030] The overload safety activation unit 44 is a drive circuit that is activated when the determination unit 42 determines that there is an overload, and includes, for example, an alarm activation circuit, a lock activation circuit, etc.

[0031] When a user sits on the chair 10, or when a load is applied to the chair 10, that load is transmitted from the backrest 12 to the lifting drive unit 20, and further to the receiving mechanism 30. The load receiving member 31 of the receiving mechanism 30 undergoes deformation corresponding to the load. This deformation is detected by the deformation sensor 41.

[0032] More specifically, as shown in Figure 8, the load causes a downward force F1 to act on the connecting shaft 32. This downward force F1 is transmitted to the transfer guide roller 33 via the load receiving member 31, and the transfer guide roller 33 is pressed against the bottom plate 4b of the carry rail 4 (or the bottom plate 5b of the frame rail 5a), causing the transfer guide roller 33 to receive a reaction force F2 from the bottom plate 4b (or 5b). As a result, a compressive stress F3 acts on the upper surface of the plate portion 34, causing compressive strain. This compressive strain is detected by the strain sensor 41a. A tensile stress F4 acts on the lower surface of the plate portion 34, causing tensile strain. This tensile strain is detected by the strain sensor 41b.

[0033] The detection signals from these strain sensors 41 are sent to the determination unit 42, where it is determined whether or not an overload is present. In other words, it is determined whether or not the applied load exceeds the load capacity of the chair 10. Specifically, it is determined whether or not the amount of strain detected by the strain sensors 41 exceeds a threshold.

[0034] Preferably, the strain amounts detected by the upper and lower strain sensors 41a and 41b of each load-bearing member 31 are added together. This allows the absolute values ​​of the compressive stress and tensile stress to be added together, thereby improving detection accuracy. Furthermore, since the center of the bathing assistance chair device 3 in the left-right direction is the load center, placing the strain sensor 41 on the plate portion 34 of the load-receiving member 31 that faces the center of the device increases the sensitivity to load.

[0035] More preferably, the detected strain amounts of the four (or more) load-bearing members 31 in the bathing assistance chair device 3 are summed up, and it is determined whether the summed value exceeds the summed threshold. Alternatively, the average value of the detected strain amounts of the four (or more) load-bearing members 31 is calculated, and it is determined whether the average value exceeds the average threshold. This can suppress malfunctions of the load detection system 40. Alternatively, it may be determined whether the detected strain amount of at least one of the four (or more) load-bearing members 31 exceeds a threshold.

[0036] For example, if the chair 10 is overloaded due to the weight of the person sitting on it, the determination unit 42 will determine that the threshold has been exceeded. In other words, it will be determined that it is overloaded. In this case, the overload safety activation unit 44 will activate a lamp or buzzer to notify that it is overloaded, or it will lock the chair 10 so that it cannot be raised, lowered, or slid. This ensures the safety of the user and prevents damage to the bathing assistance chair device 3.

[0037] Since the load-bearing member 31 is not placed in the bathtub 7 (Figure 3(b)) and submerged in water, high waterproofness is not required for the strain sensor 41 and lead wire 43. This reduces the waterproofing work required during the manufacturing of the bathing assistance chair device 3. Even if the strain sensor 41 and lead wire 43 were to break, they are located in a place that is difficult to touch (the bottom of the lifting drive unit 20 on the back of the chair 10) and will not be submerged in water, so the risk of electric shock is low.

[0038] Next, other embodiments of the present invention will be described. In the following embodiments, components that overlap with those described above are denoted by the same reference numerals in the drawings and their descriptions are omitted. <Second Embodiment (Figures 9-10)> As shown in Figure 9, in the second embodiment of the present invention, a cantilevered detection projection 36 is provided on the load-receiving member 31. The detection projection 36 protrudes outward in the front-rear direction from directly below the connecting shaft 32 in the longitudinal center of the load-receiving member 31. Preferably, the detection projection 36 is elastic. A hanging piece 37 is provided at the tip of the detection projection 36 so as to protrude downward. As shown in Figure 10, a roller 38 (contact body) is rotatably provided at the lower end of the hanging piece 37. The axis of rotation of the roller 38 is oriented in the front-rear direction, and the roller 38 is in rolling contact with the bottom plate 4b of the carry rail 4 (or the bottom plate 5b of the frame rail 5a).

[0039] In the second embodiment, the strain sensor 41 is provided on the detection projection 36. The strain sensor 41 is provided on the upper surface of the detection projection 36, but it may also be provided on the lower surface of the detection projection 36.

[0040] When a load is applied to the chair 10, the central part of the load-receiving member 31 deforms and sinks, causing the detection projection 36 to bend and the strain sensor 41 to react. This allows for highly sensitive detection of the load.

[0041] <Third Embodiment (Figure 11)> As shown in Figure 11, in the third embodiment of the present invention, a weight-reducing portion consisting of a hole 34c is formed in the plate portion 34 of the load-receiving member 31. This makes the plate portion 34 more flexible under load, thereby increasing the load detection sensitivity of the strain sensor 41.

[0042] <Fourth Embodiment (Figure 12)> As shown in Figure 12, in the fourth embodiment of the present invention, the width (height dimension) of the plate portion 34 of the load-receiving member 31 is smaller than the width of the plate portion 35. In other words, a weight-reducing portion consisting of a narrowed-width portion 34d is formed in the plate portion 34. This makes the plate portion 34 more flexible under load, thereby increasing the sensitivity to load detection.

[0043] The present invention is not limited to the embodiments described above, and various modifications can be made without departing from its spirit. For example, the transfer guide is not limited to a transfer guide roller 33 that rolls along the carry rail 4 and the frame rail 5a, but may also be a sliding body (slider) that slides along the carry rail 4 and the frame rail 5a. The longitudinal direction of the load-bearing member may be oriented in the front-to-back direction of the bathing assistance chair device 3. As a modification of the third and fourth embodiments (Figures 11 and 12), the entire or a part of the plate portion 34 of the load-receiving member 31 may be made thinner than the plate portion 35 to form a weight-reducing portion consisting of a thin portion. A weight-reducing portion consisting of a recess may be formed in the plate portion 34. A weight-reducing portion may also be formed in the load-receiving member 31 having the detection projection 36 of the second embodiment (Figures 9 to 10). [Industrial applicability]

[0044] This invention is applicable to bathing assistance devices for persons requiring assistance. [Explanation of symbols]

[0045] A person requiring assistance 1. Wheelchair for bathing 2 Carry 3. Chair device for assisting with bathing 4. Carry Rail 4b Bottom plate 5. Bathtub-side rail mechanism 5a Frame rail 5b Bottom plate 6 Bathroom 7 Bathtub 7a Bathtub stile 10 chairs 11 Seat 12 Backrest 13 racks 20 Lifting drive unit 21 pinion 22 Unit Base 24 Control Units 30 Receiving mechanism 31 Load-bearing member 32 Connection shaft (connection part) 33 Transfer Guide Roller (Transfer Guide) 34. Plate section (the part of the lifting drive unit that is closer to the center in the left-right direction than the connecting section) 34c Hole (weight-reducing section) 34d Narrow section (weight-reducing section) 35 Plate part 36 detection of protruding fragments 37 Hanging piece 38. Contactor 40 Load detection system 41. Strain Sensor 41a Upper strain sensor 41b Lower strain sensor 42 Judgment section 43 Detection signal line 44 Overload safety activation part

Claims

1. A bathing assistance chair device that is supported so as to allow transfer between a carrier rail and a rail installed on the bathtub frame, A chair having a seat and a backrest, A lifting drive unit is mounted on the aforementioned carry rail and the aforementioned frame rail so as to be transferable, and is engaged with the backrest so as to be vertically slidable to raise and lower the chair, A load-receiving member provided at the bottom of the aforementioned lifting drive unit, A transfer guide is provided on the load-receiving member and is guided in contact with the carry rail and the frame rail, A strain sensor is provided on the load-receiving member, A determination unit that determines whether or not an overload is present based on the value detected by the strain sensor, The load-receiving member is provided with a substantially horizontally oriented longitudinal central portion which is connected to the lifting drive unit via a connecting portion, and the transfer guides are provided at both ends of the load-receiving member in the longitudinal direction. A bathing assistance chair device characterized in that the strain sensors are provided on the upper and lower surfaces of the load-receiving member, respectively.

2. The bathing assistance chair device according to claim 1, characterized in that the determination unit performs the determination by summing the absolute values ​​of the detected values ​​of the upper and lower strain sensors.

3. A bathing assistance chair device that is supported so as to allow transfer between a carrier rail and a rail installed on the bathtub frame, A chair having a seat and a backrest, A lifting drive unit is mounted on the aforementioned carry rail and the aforementioned frame rail so as to be transferable, and is engaged with the backrest so as to be vertically slidable to raise and lower the chair, A load-receiving member provided at the bottom of the aforementioned lifting drive unit, A transfer guide is provided on the load-receiving member and is guided in contact with the carry rail and the frame rail, A strain sensor is provided on the load-receiving member, A determination unit that determines whether or not an overload is present based on the value detected by the strain sensor, The lifting drive unit is provided with load-receiving members positioned at both the left and right ends of the bottom of the lifting drive unit, with their longitudinal direction oriented to the left and right, and each load-receiving member is connected to the lifting drive unit via a connecting portion. A bathing assistance chair device characterized in that the strain sensor is provided on the part of the lifting drive unit that is on the left-right side of the connecting portion of each load-receiving member.

4. A bathing assistance chair device that is supported so as to allow transfer between a carrier rail and a rail installed on the bathtub frame, A chair having a seat and a backrest, A lifting drive unit is mounted on the aforementioned carry rail and the aforementioned frame rail so as to be transferable, and is engaged with the backrest so as to be vertically slidable to raise and lower the chair, A load-receiving member provided at the bottom of the aforementioned lifting drive unit, A transfer guide is provided on the load-receiving member and is guided in contact with the carry rail and the frame rail, A strain sensor is provided on the load-receiving member, A determination unit that determines whether or not an overload is present based on the value detected by the strain sensor, A bathing assistance chair device comprising the load-receiving member having a cantilevered detection projection, the tip of the detection projection being provided with a contact body that contacts the carry rail and the frame rail, and the strain sensor being provided on the detection projection.

5. The bathing assistance chair device according to any one of claims 1 to 4, characterized in that the load-bearing member has a weight-reducing portion formed therein.

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