Bathing assistance chair device

Abstract

To provide a drive unit which detects not only landing on a seat part but also hanging of the seat part and stops the drive unit without complicating a structure of a mechanical detection mechanism in a chair device for bathing assistance.SOLUTION: A chair device 20 for bathing assistance is moved from a support rail 14 of a carry 10 to a support rail on a bathtub frame and can enter / leave the bathtub. A back part of a backrest 23 of a chair 21 is provided with a rising / falling support body 31 and supports the chair 21 via the rising / falling support body 31 so that it can rise / fall with a drive unit 32 on the support rail 14. The rising / falling support body 31 is provided with a detection rod 40. When the lower end of the detection rod 40 lands, the detection rod 40 is shifted to add an actuation input to a stop switch 33, and the drive unit 32 is stopped. A seat part 22 and the detection rod 40 are joined by a linkage mechanism 50. When the seat part 22 is pushed up, the detection rod 40 is displaced to an operation position via the linkage mechanism 50.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a chair device used to assist people requiring assistance in bathing, and more particularly to a bathing assistance chair device that is supported by support rails installed on the bathtub frame and allows people to enter and exit the bathtub. [Background technology]

[0002] A chair device used to assist people requiring assistance in bathing is well known (see, for example, Patent Document 1). This type of chair device has a lift mechanism attached to the back of the chair. The drive unit of the lift mechanism is supported by a horizontal support rail at the top end of a wheeled carrier. The chair device, with the person requiring assistance sitting in it, is moved to the bathroom by the carrier. The support rail of the rail unit is installed horizontally on the frame of the bathtub, and the support rail of the carrier and the support rail of the rail unit are aligned in a straight line. The drive unit then slides onto the support rail of the rail unit, positioning the chair device above the bathtub. Next, the drive unit drives the chair to lower it and place it in the bath. This allows the person requiring assistance to take a bath while seated in the chair. The person is then removed from the bath by reversing the procedure used to enter the bath. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-029617 Summary of the Invention [Problem to be solved by the invention]

[0004] This type of bathing assistance chair device is equipped with a landing detection mechanism that uses a sensor to detect when the chair lands on the bottom of the bathtub or when a foot or other part of the body gets caught between the chair and the inside of the bathtub during bathing operation, and stops the drive unit. However, in the case of an electrical mechanism using a sensor, the sensor installed on the bottom of the chair is immersed in the bathtub water, so high waterproofing is required. In addition, the distance between the safety circuit in the drive unit and the sensor changes depending on the rise and fall of the chair, making wiring management difficult.

[0005] Some known devices use a mechanical mechanism that includes a detection rod attached to the lift mechanism's lift support to detect when the chair lands on the bathtub bottom. When force is applied to the bottom of the detection rod, the rod displaces relative to the chair and activates a stop switch in the drive unit. However, this mechanism is difficult to activate if an obstacle or the occupant's foot gets caught between the chair seat and the bathtub's interior. In view of the above circumstances, the present invention aims to provide a bathing assistance chair device that has a mechanical landing detection mechanism that does not require waterproofing or wiring, and that can detect when the seat gets caught, etc., and stop the drive unit without complicating the structure of the detection mechanism. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a chair device for bathing assistance that can be moved from the support rail of a carrier to the support rail on a bathtub frame to enter and exit a bathtub, a chair including a backrest and a seat; A lifting support provided on the back of the backrest; a drive unit supported on each of the support rails so as to be able to move over, and supporting the chair via the lift support so as to be able to lift and lower; a stop switch connected to a control circuit of the drive unit for stopping the drive of the drive unit in response to an actuation input; a detection rod that extends vertically along the lifting support and is raised relative to the lifting support when its lower end lands, and is biased toward the drive unit to be positioned at an operating position where the detection rod applies the operating input to the stop switch; a linking mechanism that links the seat and the detection rod so as to displace the detection rod to the operating position when the seat is pushed up; The present invention is characterized by the following features.

[0007] When the seat of this bathing assistance chair device is about to land on the bottom of the bathtub, the detection rod hits the bottom of the bathtub and is pushed up relatively, positioning it in the operating position, which applies an operating input to the stop switch and stops the drive unit. When the seat catches on an obstacle or the occupant's leg, the seat is pushed up and the detecting rod is displaced to the operating position via the linkage mechanism, which applies an operating input to the stop switch and stops the drive unit. Therefore, the mechanical detection mechanism detects not only the seat landing but also the seat getting caught, etc., and stops the drive unit, ensuring safety. Because it is a mechanical detection mechanism, waterproofing and wiring are not required.

[0008] It is preferable that the linking mechanism includes a sliding guide provided on the detection rod, and a linking shaft provided on the seat and linked to the sliding guide. As a result, when the seat gets caught on an obstacle or the occupant's leg and is pushed up, the connecting shaft displaces along with the seat, displacing the connected sliding guide and eventually displacing the detection rod to its operating position. This applies an operating input to the stop switch, stopping the drive unit. This simple mechanical detection mechanism can detect when the seat is caught, etc.

[0009] It is preferable that the linking mechanism includes a linkage link rotatably mounted on the lifting support and slidably engaged with the sliding guide, and the linkage shaft is linked to the sliding guide via the linkage link. As a result, when the seat gets caught on an obstacle or the occupant's foot and is pushed up, the connecting shaft displaces along with the seat, which displaces the interlocking link and thus the sliding guide. This displaces the detection rod to its operating position, which applies an operating input to the stop switch and stops the drive unit. This makes it possible to detect when the seat gets caught, etc., without complicating the mechanical detection mechanism.

[0010] The chair is provided with a tilt mechanism that can be displaced between a normal position and a tilt position, The seat portion has a base frame connected to the detection rod via the connecting mechanism and a seat portion provided on the base frame, and in the tilted position, a rear end portion of the seat portion is slid forward and a front end portion of the seat portion is tilted upward relative to the normal position, Furthermore, it is preferable that the base frame is provided with a hook extending forward and backward, and that the rear end of the bottom of the seat portion is provided with a hook engagement portion that hooks onto the hook from below and is movable forward and backward. As the chair tilts, the hook engaging portion moves back and forth along the hook. When the base frame of the seat gets caught directly on an obstacle or the feet of a seated person and is pushed up, the detection rod is displaced to the operating position via the linkage mechanism, an operating input is applied to the stop switch, and the drive unit is stopped. When the seat surface of the seat is caught on an obstacle or the leg of a seated person and pushed up, the hook engaging part hits the hook, pushing up the base frame, which displaces the detection rod to the operating position via the linkage mechanism, applies an operating input to the stop switch, and stops the drive unit. [Effects of the Invention]

[0011] According to the present invention, it is possible to detect not only the seat landing but also the seat getting caught, etc., and stop the drive unit without complicating the structure of the mechanical detection mechanism. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a side view of a bathing wheelchair including a bathing assistance chair device and a carrier according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a side view showing the bathing assistance chair device with the chair in a tilted position. [Figure 3] FIG. 3 is a side view showing the rear end of the seat and the lower end of the backrest of the chair with the detection rod in its normal position. [Figure 4] FIG. 4 is an exploded perspective view of the rear end of the seat of the chair and the lower end of the lift support. [Figure 5] 5 is a front cross-sectional view of the seat taken along line VV in FIG. [Figure 6] 6 is a side cross-sectional view of the seat taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a perspective view showing a part of the frame of the seat in a tilted position. [Figure 8] FIG. 8 is a plan view of a bathing assistance system including the bathing wheelchair and a rail unit set in a bathtub. [Figure 9] FIG. 9 is a side view of the chair in the inserted state. [Figure 10] FIG. 10 is a side view showing the rear end of the seat and the lower end of the backrest of the chair with the detection rod touching the bottom of the bathtub. [Figure 11] FIG. 11 is a side view showing the rear end of the seat and the lower end of the backrest of the chair in a state where the seat is pushed up. [Figure 12] FIG. 12 is a side view showing the rear end of the seat and the lower end of the backrest of a bathing assistance chair apparatus according to a second embodiment of the present invention, with the detection rod in its normal position. [Figure 13] FIG. 13 is a side view showing the rear end of the seat and the lower end of the backrest in the second embodiment with the detection rod in a state where it has landed on the bottom of the bathtub. [Figure 14] FIG. 14 is a side view showing the rear end of the seat and the lower end of the backrest in the second embodiment in a state where the seat is pushed up. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment (FIGS. 1 to 11)> FIG. 1 shows a bathing wheelchair 1 used to assist people who require assistance in bathing. The bathing wheelchair 1 comprises a carrier 10 and a bathing assistance chair device 20. The carrier 10 includes a running platform 11 with wheels 13. A support post 12 is erected in the center of the running platform 11, and a support rail 14 is provided at the top end of the support post, extending left and right (in directions perpendicular to the plane of the paper in FIG. 1). A chair device 20 is supported on the support rail 14.

[0014] The chair device 20 can be carried while supported by the carrier 10 (FIG. 1), and can be placed in the bath while supported by the support rails 3a (FIG. 8) on the bathtub frame 2a (FIG. 9). In the following description, unless otherwise specified, the chair device 20 is assumed to be mounted on the carrier 10.

[0015] 1, the chair device 20 includes a chair 21, a tilt mechanism 29, and a lift mechanism 30. The chair 21 includes a seat 22 and a backrest 23. The seat 22 includes a base frame 22b and a seat surface 22a that covers the base frame 22b.

[0016] A tilt mechanism 29 is incorporated in chair 21. Tilt mechanism 29 allows chair 21 to be displaced (tilted) between a normal position and a tilted position. As shown in Fig. 2, in the tilted position, the rear end of seat portion 22a slides forward and the front end of seat portion 22a is tilted upward relative to the normal position (Fig. 1).

[0017] As shown in Figures 5 to 7, rolling elements 28 with their axes oriented left and right are provided at the rear end of the bottom frame of the seat portion 22a. Guides 25 that guide the rolling elements 28 back and forth are provided on the base frame 22b. The guide 25 is formed in the shape of a long box that is open upward and extends front and rear. The rolling elements 28 are housed in the guide 25 so that they can roll (move) back and forth (left and right in Figure 6). A hook 25f is provided on the upper edge of one long side wall of the guide 25. The hook 25f is formed in the shape of a long plate with an inverted L-shaped cross section that protrudes toward the opposing long side wall of the guide 25 and extends front and rear. The hook 25f fits over the shaft portion 28f of the rolling elements 28 on the side of the one long side wall. When the seat portion 22a is pushed up against the base frame 22b by some external force, the shaft portion 28f (hook engaging portion) is caught on the hook 25f from below.

[0018] As shown in FIG. 1, the chair 21 is supported on the carrier 10 via a lift mechanism 30. The lift mechanism 30 includes a lift support 31 and a drive unit 32. The lift support 31 is provided on the back of the backrest 23, extends vertically along the backrest 23, and is tilted rearward as it extends upward. As shown in FIG. 4, a bearing 31d is provided on the side of the lower end of the lift support 31. The connecting cover plate 24 at the rear end of the base frame 22b is connected to the lift support 31 via the bearing 31d. The base frame 22b is rotatable around the bearing 31d. Under normal circumstances, the moment due to the weight of the seat 22 keeps the base frame 22b at a stable, approximately horizontal angle.

[0019] 1, a drive unit 32 is provided on the back of the lift support 31. The drive unit 32 is mounted on the support rail 14. As shown in Figure 8, during bathing assistance, the support rail 14 is aligned in a straight line with the support rail 3a of the rail unit 3 separately installed on the bathtub frame 2a. The drive unit 32 can slide back and forth between these support rails 14 and 3a. Consequently, the chair device 20 can be transferred between the carrier 10 and the rail unit 3.

[0020] The drive unit 32 supports the chair 21 via the lifting support 31 so that it can be raised and lowered. Although detailed illustration is omitted, the drive unit 32 includes a drive motor, a power transmission mechanism connected to the output shaft of the drive motor, and a control circuit. The power transmission mechanism converts the rotational torque of the drive motor into the lifting and lowering movement of the lifting support 31. For example, the power transmission mechanism includes gears. Furthermore, a rack is provided on the lifting support 31 along the longitudinal direction (vertical direction), and the gear and rack mesh with each other.

[0021] As shown in Fig. 1, a stop switch 33 is provided on the front surface of the housing of the drive unit 32 facing the lifting support 31. The stop switch 33 is electrically connected to the control circuit in the housing of the drive unit 32. The drive motor is stopped when the stop switch 33 is pressed. In other words, the stop switch 33 stops the drive of the drive unit 32 in response to a pressing force, i.e., an actuation input.

[0022] As shown in Fig. 4, a detection rod 40 is provided on one side (for example, the left side) of the lifting support 31. As shown in Fig. 3, the detection rod 40 is formed in the shape of a long plate extending vertically along the lifting support 31. Although detailed illustration is omitted, the cross section of the detection rod 40 is preferably L-shaped to ensure strength. The detection rod 40 may also be in the shape of a thick plate. The detection rod 40 is disposed so that an intermediate height portion thereof is close to or in contact with the front and rear of the stop switch 33. At the lower end of the detection rod 40, a landing detection roller 41 (landing detection portion) is provided.

[0023] As shown in Figure 3, a cam plate portion 42 is formed on each of the upper and lower portions of the detection rod 40 so as to protrude forward. A guide hole 42a, which is bent in a generally V-shape, is formed through each cam plate portion 42. The portion above the center of the guide hole 42a is inclined upward and rearward. The portion below the center of the guide hole 42a extends straight downward.

[0024] The lower cam plate portion 42 of the detection rod 40 is disposed below the bearing portion 31d. The triangular side plate portion 24b of the connecting cover plate 24 covers the outer surface of the lower cam plate portion 42.

[0025] Guide pins 43 are provided on the upper and lower sides of the side surface (the surface on which the detection rod 40 is arranged) of the lifting support 31. Each guide pin 43 is inserted into and engaged with the corresponding guide hole 42a. The lower guide pin 43 is disposed below the bearing portion 31d.

[0026] The guide pin 43 is engaged with the guide hole 42a, allowing the detection rod 40 to move between a normal position and an operating position. In the normal position, the guide pin 43 is positioned at the upper end of the guide hole 42a, the detection rod 40 is retracted forward so as not to press the stop switch 33, and the landing detection roller 41 protrudes below the seat 22.

[0027] 10, in the actuated position, the guide pin 43 is positioned in the middle portion of the guide hole 42a or in the lower end portion of the guide hole 42a, and the detection rod 40 is raised relative to the lifting support 31 and biased rearward (toward the drive unit) compared to when it is in the normal position. The biased detection rod 40 presses the stop switch 33. In other words, an actuation input is applied to the stop switch 33.

[0028] 3 and 4, the rear end of the seat 22, the lifting support 31, and the detection rod 40 are connected via a connecting mechanism 50. The connecting mechanism 50 includes a sliding guide 51 provided on the detection rod 40, a connecting shaft 52 provided on the seat 22, and an interlocking link 53. The portion of the cam plate 42 on the lower side of the detection rod 40 below the guide hole 42a protrudes forward to form the sliding guide 51. The sliding guide 51 is formed with a long guide hole 51a extending in the front-to-rear direction.

[0029] The connecting shaft 52 is provided so as to protrude from the side plate portion 24b of the connecting cover plate 24 toward the inner surface of the side plate portion 24b. The connecting shaft 52 is disposed below the sliding guide 51, and therefore below the bearing portion 31d.

[0030] The interlocking link 53 is formed in a roughly triangular plate shape and is disposed so as to be attached to the side of the lifting support 31. A connecting cover plate 24 covers the outer surface of the interlocking link 53.

[0031] The interlocking link 53 connects the lifting support 31 and the detection rod 40, and is engaged with the seat base frame 22b. A mounting plate 31f that protrudes forward is provided at the lower end of the lifting support 31. One end of the interlocking link 53 is rotatably connected to the mounting plate 31f. The interlocking link 53 extends obliquely upward from the connecting end with the mounting plate 31f toward the rear detection rod 40. The tip of the interlocking link 53 is inserted between the side surface of the lifting support 31 and the sliding guide 51. An engagement pin 54 is provided at the tip of the interlocking link 53. The engagement pin 54 is slidably engaged with the guide hole 51a.

[0032] The rear edge of the interlocking link 53 forms a gently curved guide surface 53c. When the detection rod 40 is in its normal position, the engagement pin 54 is positioned at the rear end of the guide hole 51a. Also, the guide surface 53c of the interlocking link 53 abuts against the connecting shaft 52 from above. This causes the guide surface 53c to engage with the connecting shaft 52. The connecting shaft 52 and the sliding guide 51 are connected via the interlocking link 53. At this time, the base frame 22b of the seat 22 is positioned at the approximately horizontal stable angle.

[0033] As shown in Figure 11, when the base frame 22b is rotated around the bearing portion 31d from its normal stable angle so that its front end faces upward, the link shaft 52 of the connecting cover plate 24 is displaced forward. The link shaft 52 pushes the interlocking link 53 forward, and the tip of the interlocking link 53 is rotated obliquely upward and forward. This causes the engagement pin 54 to slide forward along the guide hole 51a and push up the detection rod 40. At this time, the upper and lower guide pins 43 and the guide hole 42a mutually guide each other, and the detection rod 40 is biased backward (toward the drive unit) and positioned at the operating position.

[0034] The bathing wheelchair 1 is used as follows when bathing the person requiring assistance A. As shown in FIG. 2, person requiring assistance A is seated on chair 21, and bathing wheelchair 1 is carried to the bathroom. As shown in FIG. 8, support rail 3a of rail unit 3 is installed horizontally on frame 2a of bathtub 2. Support rail 14 of carrier 10 and support rail 3a of rail unit 3 are aligned in a straight line. Then, drive unit 32 is slid from support rail 14 to support rail 3a. This allows chair device 20 to be moved from carrier 10 onto bathtub 2. Preferably, chair device 20 is tilted during the move. 9, the chair 21 is lowered together with the lifting support 31 into the bathtub 2 by the drive unit 32, and the chair 21 is placed in the bathtub 2. This allows the person requiring assistance to take a bath while sitting in the chair 21.

[0035] As shown in Figure 10, when the seat 22 is about to land on the bottom surface 2b of the bathtub 2 during the bath-entry process, the landing detection roller 41 hits the bathtub bottom surface 2b and is pushed up. This causes the detection rod 40 to rise relative to the lifting support 31. Accordingly, due to the mutual guiding action between the upper and lower guide holes 42a and the guide pin 43, the detection rod 40 moves backward in parallel to the operating position. At this time, the detection rod 40 presses the stop switch 33, which applies an operating input to the stop switch 33. This stops the drive unit 32. As a result, the seat 22 can be prevented from hitting the bathtub bottom surface 2b with force, ensuring safety.

[0036] When the detection rod 40 is biased to the operating position, the engagement pin 54 slides forward along the guide hole 51a, and the interlocking link 53 rotates. Also, the interlocking shaft 52 moves away from the interlocking link 53. Therefore, the interlocking mechanism 50 does not interfere with the biasing action of the detection rod 40 when the vehicle lands. The fish is then removed from the tank in the reverse order of how it was taken in.

[0037] On the other hand, as shown in Figure 11, during the process of chair device 20 descending into bathtub 2, it is possible that seat 22 may collide with some obstacle inside bathtub 2, or that the occupant's feet may hit and get caught on the inner wall of bathtub 2, or that the feet may become pinched between the inner wall of bathtub 2 and chair device 20. In such cases, an upward force (upward thrust) is applied to seat 22. This causes base frame 22b of seat 22 to rotate around bearing 31d, with its front end point pointing upward. When the upward thrust is applied directly to base frame 22b, or even when the upward thrust is applied directly to seat portion 22a, rolling element shaft 28f (hook engaging portion) of seat portion 22a can hit hook 25f from below and push up hook 25f, thereby causing base frame 22b to rotate.

[0038] As the base frame 22b rotates and displaces, the connecting shaft 52 is displaced forward, the interlocking link 53 is rotated and displaced, the engagement pin 54 is slid forward, and the detection rod 40 is pushed up and positioned at the operating position. This applies an operating input to the stop switch 33, and the drive unit 32 is stopped. Therefore, even if the seat 33 hits or gets caught on an obstacle, the downward movement of the chair 21 can be immediately stopped. As a result, safety can be further ensured. In the chair device 20, a mechanical detection mechanism with a simple structure can reliably detect not only the landing of the seat 22 but also the catching of the seat 22. Because it is a mechanical detection mechanism, waterproofing and wiring are not required.

[0039] Next, another embodiment of the present invention will be described. In the following embodiments, the same components as those already described will be denoted by the same reference numerals in the drawings and the description thereof will be omitted. <Second embodiment (FIGS. 12 to 14)> As shown in Figure 12, in bath assistance chair device 20B according to the second embodiment of the present invention, slide guide 55 of linking mechanism 50 is directly linked to linking shaft 52. Linking link 53 (Figure 3) is omitted. More specifically, the portion of the detection rod 40 below the guide hole 42a in the lower cam plate portion 42 protrudes forward and downward to form a sliding guide 55. An upwardly recessed guide recess 55a is formed at the lower end of the sliding guide 55. The edge of the guide recess 55a facing the detection rod 40 forms a guide surface 56 that is inclined upward and backward.

[0040] The connecting cover plate 24 of the seat portion 22 covers the outer surface of the cam plate portion 42 and therefore the sliding guide 55. The connecting shaft 52 provided on the connecting cover plate 24 is disposed in the guide recess 55a and abuts against the guide surface 56. This causes the sliding guide 55 and the connecting shaft 52 to engage with each other so as to move in conjunction with each other.

[0041] As shown in Figure 13, when seat 22 of bath assistance chair device 20B is about to land on bottom surface 2b of bathtub 2 during the bath entry process, detection rod 40 hits bathtub bottom surface 2b and is pushed up. Furthermore, due to the mutual guiding action of guide hole 42a and guide pin 43, detection rod 40 is biased to the operating position. This presses stop switch 33, stopping drive unit 32. At this time, linking shaft 52 either moves downward away from guide surface 56 or slides along guide surface 56. Therefore, sliding guide 55 of linking mechanism 50 and linking shaft 52 do not interfere with the biasing action of detection rod 40 when landing.

[0042] As shown in Figure 14, when an upward force is applied to the seat 22 due to an obstacle or an occupant's foot getting caught while entering the tank, the seat 22 rotates around the bearing 31d so that the front end faces upward, and the connecting shaft 52 is displaced forward accordingly. At this time, the connecting shaft 52 slides along the guide surface 56, causing the sliding guide 55 to rise. Consequently, the detection rod 40 is raised, and the mutual guiding action between the upper and lower guide pins 43 and the guide hole 42a causes the detection rod 40 to move backward in parallel to the operating position. This presses the stop switch 33, stopping the drive unit 32. As a result, safety is ensured.

[0043] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the chair does not need to be provided with a tilt mechanism. The seat surface portion 22a of the seat portion 22 may be fixed (connected so as not to be displaceable relative to) the base frame 22b. The shape of the detection rod 40 is not limited to that of the embodiment. The lifting support 31 and the detection rod 40 may be connected via a pair of parallel links instead of the guide pin 43 and the guide hole 42a. [Industrial Applicability]

[0044] The present invention can be applied to, for example, a wheelchair for assisting a person requiring assistance in bathing. [Explanation of symbols]

[0045] 1. Bath wheelchair 2b Bathtub bottom 10 Carry 20, 20B Bathing assistance chair device 20B Bathing assistance chair device 21 Chair 22 Seat area 22a Seat part 22b base frame 23 Backrest 24 Connecting cover plate 25f hook 28 rolling elements 28f Shaft (hook engagement part) 29 Tilt mechanism 30 Lift mechanism 31 Lifting support 32 Drive unit 33 Stop switch 40 Detection rod 41 Landing detection roller 42 Cam plate part 42a Guide hole 43 Guide pin 50 Interlocking mechanism 51 Sliding guide 51a Guide hole 52 Connecting Axis 53 Related Links 53c Guide surface 54 Engagement pin 55 Sliding guide 55a Guide recess 56 Guide surface

Claims

1. A chair device for bathing assistance that can be moved from the support rail of the carrier to the support rail on the bathtub frame and can enter and exit the bathtub, a chair including a backrest and a seat; A lifting support provided on the back of the backrest; a drive unit provided on a back of the lifting support, supported so as to be able to move onto each of the support rails, and supporting the chair so as to be able to rise and fall via the lifting support; a stop switch connected to a control circuit of the drive unit for stopping the drive of the drive unit in response to an actuation input; a detection rod that extends vertically along the lifting support and is raised relative to the lifting support when its lower end lands, and is biased toward the drive unit to be positioned at an operating position where the detection rod applies the operating input to the stop switch; a linking mechanism that links the seat and the detection rod so that the detection rod is displaced to the operating position when the seat is pushed up; A bathing assistance chair device comprising:

2. The bath assistance chair device according to claim 1, characterized in that the connecting mechanism includes a sliding guide provided on the detection rod and a connecting shaft provided on the seat and connected to the sliding guide.

3. The bath assistance chair device of claim 2, characterized in that the linking mechanism includes a linking link rotatably mounted on the lifting support and slidably engaged with the sliding guide, and the linking shaft is linked to the sliding guide via the linking link.

4. The chair is provided with a tilt mechanism that can be displaced between a normal position and a tilt position, The seat portion has a base frame connected to the detection rod via the connecting mechanism and a seat portion provided on the base frame, and in the tilted position, a rear end portion of the seat portion is slid forward and a front end portion of the seat portion is tilted upward relative to the normal position, Furthermore, a hook extending forward and backward is provided on the base frame, and a hook engagement portion that hooks onto the hook from below is provided at the rear end of the bottom of the seat portion and is movable forward and backward.A bathing assistance chair device as described in any one of claims 1 to 3, characterized in that

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