JP2024024990A - Wheelchair and wheelchair unit - Google Patents

Abstract

To provide a wheelchair for enabling lifting/lowering a seat part on which a cared person sits and enabling folding while the cared person is not sitting on the seat part.SOLUTION: A wheelchair 11 includes: a frame 13 to which a drive wheel 15 is attached; a frame 14 to which a drive wheel 16 is attached; and a seat part supported by the frames 13, 14. The wheelchair 11 includes: a support part 21 arranged in the frame 13 so as to support the seat part; a support part 24 arranged in the frame 14 so as to support the seat part; guide parts 19, 20, 22, 23 for enabling the seat part to be attached/detached to/from the support parts 21, 24; a reception part arranged in the seat part; and a backrest 26 arranged in the frames 13, 14 so as to allow the frames 13, 14 to be mutually changeable between a development state and a folding state while the guide parts 19, 20, 22, 23 for setting a movement direction of the seat part to be a vertical direction and the seat part are detached from the support parts 21, 24.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a wheelchair and a wheelchair unit that can raise and lower a seat on which a cared person sits.

An example of a wheelchair in which a seat on which a cared person sits can be raised and lowered is described in Patent Document 1. The wheelchair described in Patent Document 1 includes a support frame to which wheels are attached, an elevating cylinder provided on the support frame, and a chair base attached to the upper end of the elevating cylinder. The chair base includes a seat (front plate) on which a cared person sits, a rear overhang plate provided at the rear of the seat, and side plates provided on both sides of the seat. The lifting cylinder is a jack that supports a substantially central position of the seat and adjusts the height of the seat by moving the cylinder in and out using gas pressure. Note that wheelchairs capable of raising and lowering the seat portion on which a cared person sits are also described in Patent Document 2 and Patent Document 3.

Utility model registration No. 3213246 Patent No. 4583812 Patent No. 5771344

The inventor of the present application recognized the problem that the wheelchairs described in Patent Documents 1 to 3 cannot be folded without the cared person sitting on the seat.

An object of the present disclosure is to provide a wheelchair and a wheelchair unit that can raise and lower a seat on which a cared person sits, and can be folded when the cared person is not sitting on the seat. It is in.

The present disclosure provides a frame to which a first drive wheel and a second drive wheel are attached, a seat supported by the frame and on which a cared person sits, and a seat provided on the frame and on which a cared person sits. a backrest that supports the back of the cared person; an attachment/detachment mechanism that allows the seat to be attached to and removed from the support; a receiving part that receives the pressing force of an actuator that is provided on the seat and placed below the seat in the vertical direction; a guide part provided on the frame and configured to set the movement direction of the seat part, which is separated from the support part in response to the pressing force of the actuator, in the vertical direction; The wheelchair is provided with a changing mechanism that allows the frame to be changed between an unfolded state and a folded state.

According to the present disclosure, it is possible to raise and lower the seat portion on which the cared person sits, and the frame can be folded while the cared person is not sitting on the seat portion.

(A) and (B) are perspective views of the wheelchair unit. (A) is a schematic side view of the wheelchair unit, and (B) is a schematic plan view of the wheelchair unit. (A) and (B) are side sectional views showing the raising and lowering movement of the seat of the wheelchair. (A) is a perspective view showing an example of the unfolded state of the wheelchair with the seat removed, and (B) is a perspective view showing an example of the folded state of the wheelchair with the seat removed.

An embodiment of the wheelchair unit in the present disclosure will be described with reference to the drawings. The wheelchair unit 10 shown in FIGS. 1(A) and 1(B) includes a wheelchair 11 and a hydraulic jack 12. The wheelchair 11 includes a first frame 13 and a second frame 14, a drive wheel 15 attached to the first frame 13, a drive wheel 16 attached to the second frame 14, and an auxiliary wheel attached to the first frame 13. It has a wheel 17 and an auxiliary wheel 18 attached to the second frame 14. The wheelchair 11 also has guide parts 19, 20 and a support part 21 provided on the first frame 13, guide parts 22, 23 and support part 24 provided on the second frame 14, and two support parts 21, 24. It has a seat portion 25 that is supported, and a backrest 26 that connects the first frame 13 and the second frame 14.

When viewing the wheelchair 11 from the front, that is, from the front, the first frame 13 is placed on the left side, and the second frame 14 is placed on the right side. When viewing the wheelchair 11 from the front, the first frame 13 and the second frame 14 have a laterally symmetrical shape. The first frame 13 includes a first vertical member 44, a second vertical member 27, a first horizontal member 28, and a second horizontal member 29 shown in FIG. 2(B). The first vertical member 44 and the second vertical member 27 extend in the height direction. The first lateral member 28 and the second lateral member 29 extend horizontally and in the front-rear direction of the wheelchair 11. The first vertical member 44 is arranged in front of the second vertical member 27 in the front-rear direction of the wheelchair 11. In the height direction of the wheelchair 11, the first transverse member 28 is arranged above the second transverse member 29. The height direction of the wheelchair 11 is the same as the height direction of the first frame 13 and the second frame 14, and is synonymous with the vertical direction indicating the direction in which gravity acts.

The second frame 14 has a first vertical member 30 and a second vertical member 31, and a first horizontal member 32 and a second horizontal member 33. The first vertical member 30 and the second vertical member 31 extend in the height direction. The first lateral member 32 and the second lateral member 33 extend in the horizontal direction and extend in the front-rear direction of the wheelchair 11. The first vertical member 30 is disposed in front of the second vertical member 31 in the front-rear direction of the wheelchair 11. The first lateral member 32 is arranged above the second lateral member 33 in the height direction of the wheelchair 11.

The first vertical member 44, the second vertical member 27, the first horizontal member 28, and the second horizontal member 29 are metal bars (pipes). That is, the first frame 13 is configured by bending a bar (pipe), welding a plurality of bars to each other, or connecting a plurality of bars by a screw member. The first vertical member 30, the second vertical member 31, the first horizontal member 32, and the second horizontal member 33 are metal bars (pipes). In other words, the second frame 14 is configured by bending a bar (pipe), welding a plurality of bars to each other, or connecting a plurality of bars by a screw member. Examples of metal bars include aluminum, stainless steel, and steel. A hand handle 45 is provided at the upper end of the second vertical member 27, and a hand handle 46 is provided at the upper end of the second vertical member 31. The hand handles 45 and 46 are parts that the caregiver grasps with their hands when assisting the caregiver in moving and stopping the wheelchair 11.

The drive wheel 15 is rotatably attached to the first frame 13 via an axle. The drive wheel 16 is rotatably attached to the second frame 14 via an axle. Note that the hand rim that the cared person P1 operates with his right hand as shown in FIGS. . Further, a brake is provided to apply braking force to the drive wheels 15 and 16. For convenience, the hand rim and brake are not shown. The auxiliary wheel 17 is rotatably attached to the lower end of the first vertical member 44, and the auxiliary wheel 18 is rotatably attached to the lower end of the first vertical member 30. The auxiliary wheels 17 and 18 are casters that make it easier to change the moving direction of the wheelchair 11.

The two guide parts 19 and 20 are fixed to the first frame 13 by welding or screw members. The two guide parts 19 and 20 are arranged at intervals in the front-rear direction of the wheelchair 11. Moreover, the two guide parts 19 and 20 extend in the height direction and are arranged parallel to each other as shown in FIG. 2(A). Further, the support portion 21 is fixed to the two guide portions 19 and 20 by welding or screw members. The support part 21 is a metal plate, and the upper surface of the support part 21 is horizontal. As shown in FIGS. 3A and 3B, a plurality of convex portions 34 are provided on the upper surface of the support portion 21 at intervals in the front-rear direction of the wheelchair 11. The plurality of convex portions 34 protrude upward from the upper surface of the support portion 21 .

The two guide parts 22 and 23 are fixed to the second frame 14 by welding or screw members. As shown in FIG. 2(B), the two guide parts 22 and 23 are arranged at intervals in the front-rear direction of the wheelchair 11. Moreover, the two guide parts 22 and 23 extend in the height direction and are arranged parallel to each other. The four guide parts 19, 20, 22, and 23 set the moving direction of the seat part 25 in the vertical direction, and restrict the movement of the seat part 25 in a direction intersecting the vertical direction. Further, the support portion 24 is fixed to the two guide portions 22 and 23 by welding or screw members. The support part is a metal plate, and the upper surface of the support part 24 is horizontal. A plurality of convex portions 35 are provided on the upper surface of the support portion 24 at intervals in the front-rear direction of the wheelchair 11. The plurality of convex portions 35 protrude upward from the upper surface of the support portion 24 . The support parts 21 and 24 have the strength to support the loads of the seat part 25 and the cared person P1. The upper surface of the support section 21 and the upper surface of the support section 24 are arranged at the same position in the vertical direction.

The seat portion 25 is arranged between the four guide portions 19, 20, 22, and 23, and is supported by the two support portions 21 and 24. The seat portion 25 is an element on which the cared person P1 sits as shown in FIG. 2(A), and the seat portion 25 is made of wood or synthetic resin, for example. The seat 25 can be attached to and removed from the supports 21 and 24. The outer periphery of the seat portion 25 has a substantially rectangular planar shape. Sliders 47 are fixed to the outer surfaces of the four corners of the seat portion 25, respectively. Each slider 47 is made of metal, and each slider 47 is movable in the height direction by contacting the four guide parts 19, 20, 22, 22 separately. Therefore, the seat portion 25 is movable in the height direction along the four guide portions 19, 20, 22, and 23, that is, in the vertical direction in FIG. 2(A) and FIGS. 3(A) and (B). It is. The seat portion 25 is provided with a plurality of engagement holes 36. The plurality of engagement holes 36 may or may not penetrate the seat portion 25 in the thickness direction. The thickness direction of the seat portion 25 is synonymous with the height direction when the seat portion 25 is supported by the support portions 21 and 24.

When the wheelchair 11 is viewed from above as shown in FIG. 2(B), the plurality of engagement holes 36 are provided at the four corners of the seat portion 25. In this embodiment, a plan view of the wheelchair 11 means looking down on the wheelchair 11 from directly above in the direction of gravity, that is, in the vertical direction. In FIG. 2(A), the vertical direction is shown as a vertical line D1. In FIG. 2(A), it is perpendicular to the plane representing the shape of the wheelchair 11. As shown in FIGS. 3A and 3B, when the seat portion 25 is moved in the height direction, the convex portions 34 and 35 enter and exit the respective engagement holes 36 independently. As shown in FIG. 3B, when the seat part 25 is supported by the two support parts 21 and 24, the seat part 25 is supported by the distance between the first frame 13 and the second frame 14 in the left-right direction of the wheelchair 11. It plays a role in preventing narrowing. The upper surface 25B of the seat portion 25 is curved along the shape of the buttocks and the shape of the lower limbs of the cared person P1. Further, a cushion such as a cushion may be placed on the seat portion 25, but the illustration of the cushion is omitted here.

As shown in FIGS. 1(A), (B), FIG. 2(A), FIG. 3(A), and (B), a receiving portion 37 is provided on the lower surface of the seat portion 25. The receiving portion 37 has a function of receiving the pressing force applied from the hydraulic jack 12 and a function of transmitting the loads of the seat portion 25 and the cared person P1 to the hydraulic jack 12. The receiving portion 37 is, for example, a wooden or metal cylinder. The receiving portion 37 has a strength capable of withstanding the loads of the seat portion 25 and the cared person P1. As shown in FIG. 2(B), when the wheelchair 11 is viewed from above, the receiving portion 37 is located approximately at the center of the seat portion 25.

More specifically, the intersection C1 of two diagonal lines B1 and B2 passing through opposite corners of the seat 25 is included in the arrangement area of the receiving part 37. Further, the diagonal line B1 can also be understood as a virtual line connecting the guide portion 19 and the guide portion 23. The diagonal line B2 can also be understood as a virtual line connecting the guide section 22 and the guide section 20. In FIG. 2(A), an imaginary line Q1 representing the center of the receiving portion 37 and a vertical line D1 are shown at a common position. The receiving portion 37 projects downward from the lower surface of the seat portion 25. Note that a cushion made of synthetic rubber that absorbs shock may be attached to the lower end of the receiving portion 37.

The backrest 26 is provided to connect the first frame 13 and the second frame 14. The backrest 26 is an element that supports the back of the cared person P1 seated on the seat portion 25. The backrest 26 is made of, for example, synthetic resin or leather. The backrest 26 is flexible and can be folded along a fold line in the height direction. Furthermore, arm supports 38 are provided on the first transverse members 28, 32, respectively. The arm support 38 is an element on which the cared person P1 rests his arm while sitting on the seat portion 25. Further, in the process of the cared person P1 standing up from a state of sitting on the seat 25 or the process of the cared person P1 sitting on the seat 25, the cared person P1 plays a role of supporting the body weight by placing a hand on the cared person P1.

The wheelchair 11 includes a folding mechanism for switching between an expanded state and a folded state when the seat portion 25 is removed. In this embodiment, when the wheelchair 11 is folded or when the wheelchair 11 is folded, the wheelchair 11 occupies more space in at least one of the left-right direction, the front-back direction, and the height direction, compared to the unfolded state of the wheelchair 11. It means that the range is narrow. Here, an example will be described in which the occupied range in the left and right direction is narrower than the unfolded state of the wheelchair 11 shown in FIG. 4(A), such as the folded state of the wheelchair 11 shown in FIG. 4(B).

Switching between the unfolded state and the folded state of the wheelchair 11 is performed with the seat portion 25 removed from the support portions 21 and 24 and removed from between the guide portions 19, 20, 22, and 23. be exposed. An example of a folding mechanism is to construct the backrest 26 from a material that can be expanded and folded. By bending the backrest 26 along the fold line, the wheelchair 11 can be folded. The folded state includes a state in which the first frame 13 and the second frame 14 are brought close to each other, or a state in which the first frame 13 and the second frame 14 are overlapped. Further, when the backrest 26 is unfolded, the wheelchair 11 is in an unfolded state in which the first frame 13 and the second frame 14 are spaced apart in the left-right direction.

Another example of the folding mechanism is that the backrest 26 is divided into a plurality of component pieces 26A and 26B in the left-right direction, and the component pieces 26A and 26B are connected to each other by a hinge 42, and the backrest 26 and the first frame are connected to each other by a hinge 42. 13 and the second frame 14 are connected by hinges 43, respectively.

The hydraulic jack 12 is provided physically separated from the wheelchair 11. As shown in FIG. 2(A), the hydraulic jack 12 is placed on the floor 39 directly below the seat 25. The hydraulic jack 12 is an actuator that has a function of generating a pushing force when raising the seat 25 and a function of receiving the load of the seat 25 and the cared person P1 when lowering the seat 25. The hydraulic jack 12 includes a main body portion 40 containing a hydraulic chamber, and a plunger 41 to which the hydraulic pressure of the hydraulic chamber acts. The plunger 41 can move up and down in the vertical direction. The tip, or upper end, of the plunger 41 is a flat surface. When the plunger 41 rises, the upper end of the plunger 41 comes into contact with the lower end of the receiving part 37. When the seat portion 25 is supported by the support portions 21 and 24 and the plunger 41 is lowered, the plunger 41 is separated from the receiving portion 37.

An example of how the wheelchair 11 is used will be explained. First, the driving wheels 15, 16 and the auxiliary wheels 17, 18 are placed on the floor 39, and the wheelchair 11 is held in the unfolded state as shown in FIG. 4(A). When the wheelchair 11 is in the unfolded state, the first frame 13 and the second frame 14 are separated by a predetermined interval.

Next, the seat 25 is lowered from above the wheelchair 11 with the lower surface 25A facing downward and the upper surface 25B of the seat 25 substantially horizontal, and the protrusions 34 and 35 are entered into the engagement holes 36, respectively. , the seat portion 25 is supported by the support portions 21 and 24, as shown in FIGS. 1(A) and 3(A). The seat portion 25 is supported by the support portions 21 and 24 and is stopped at a predetermined position in the vertical direction, that is, an initial position. In this way, the seat portion 25 is disposed between the drive wheel 15 and the first frame 13 and the drive wheel 16 and the second frame 14 in the left-right direction of the wheelchair 11 shown in FIG. , supported horizontally by support parts 21 and 24. Further, as shown in FIGS. 1(A) and 2(A), the hydraulic jack 12 is placed on the floor 39 directly below the receiving portion 37. At this point, the plunger 41 is stopped at the initial position, and the plunger 41 is separated from the receiving part 37.

Then, the plunger 41 of the hydraulic jack 12 is raised. When the upper end of the plunger 41 comes into contact with the receiving part 37, the seat part 25 is raised. By contacting the guide parts 19, 20, 22, and 23, the seat part 25 is guided so that the rising direction of the seat part 25 is the height direction, that is, the vertical direction. In other words, the seat portion 25 does not move in a direction intersecting the vertical direction. When the plunger 41 of the hydraulic jack 12 is stopped at the raised position, the seat portion 25 is stopped at the raised position as shown in FIGS. 1(B) and 3(B). The hydraulic pressure in the hydraulic chamber of the hydraulic jack 12 is maintained at a predetermined high pressure. When the seat 25 is stopped at the raised position, the lower surface 25A of the seat 25 is located below the upper ends of the guide parts 19, 20, 22, and 23. Therefore, the seat portion 25 does not move in a direction intersecting the vertical direction.

Thereafter, the cared person P1 puts his hands on the arm support 38 to support his weight and sits on the seat 25. Here, since the hydraulic chamber of the hydraulic jack 12 is maintained at high pressure, the seat portion 25 is maintained in the raised position. That is, the hydraulic jack 12 stops the plunger 41 while receiving the load of the cared person P1 and the seat portion 25. Then, when the hydraulic jack 12 is operated and the hydraulic pressure in the hydraulic chamber decreases, the plunger 41 and the seat portion 25 are lowered in synchronization. Furthermore, as shown in FIGS. 1(A), 2(A), and 3(A), when the seat portion 25 comes into contact with the support portions 21 and 24, the seat portion 25 stops at the initial position. Further, the plunger 41 is separated from the receiving portion 37. Therefore, the loads of the seat portion 25 and the cared person P1 are transmitted to the first frame 13 and the second frame 14 via the support portions 21 and 24. Thereafter, the plunger 41 is stopped at the initial position and the hydraulic jack 12 is removed from under the wheelchair 11.

On the other hand, when the cared person P1 sitting on the seat 25 gets off the seat 25, the hydraulic jack 12 is placed directly below the receiving part 37 and the plunger 41 is raised as described above. The hydraulic jack 12 raises the plunger 41 under the load of the cared person P1 and the seat 25. Then, the plunger 41 is stopped and the seat portion 25 is stopped at the raised position. Furthermore, the cared person P1 can get off the seat 25 by supporting his/her weight with his or her hands on the arm support 38. In this way, the seat portion 25 is raised and lowered within a range of about 20 cm or more between the initial position and the raised position.

Therefore, whether the cared person P1 is sitting on the seat 25 or getting off the seat 25, it is possible to prevent the cared person P1 from slumping without support. Further, it becomes easier for the cared person P1 to get on and off the seat 25, and the burden on the lower back of the caregiver who assists the cared person P1 can be reduced. Further, when the wheelchair 11 is viewed from above, the receiving portion 37 is provided approximately at the center of the seat portion 25. The approximate center of the seat portion 25 is the location where the weight of the cared person P1 is most likely to be applied. Therefore, the horizontality of the seat portion 25 supported by the hydraulic jack 12 can be ensured. Further, the seat part 25 supported by the support parts 21 and 24 is prevented from moving in a direction intersecting the height direction by having the four corners contacting the guide parts 19, 20, 22, and 23. . Therefore, in a plan view of the wheelchair 11, the positions of the plunger 41 and the receiving part 37 can be prevented from shifting.

On the other hand, after the cared person P1 gets off the seat 25, the seat 25 is grasped with the hands and lifted up, removed from the support parts 21 and 24, and inserted between the guide parts 19, 20, 22, and 23 (see FIG. 4). It can be removed as shown in A). In other words, the wheelchair 11 is placed in the unfolded state. By bending the backrest 26 along the fold line, the wheelchair 11 can be folded as shown in FIG. 4(B). Alternatively, the backrest 26 may be folded up using the hinges 42, 43 to place the wheelchair 11 in a folded state. The distance between the first frame 13 and the second frame 14 when the wheelchair 11 is in the folded state is shorter than the distance between the first frame 13 and the second frame 14 when the wheelchair 11 is in the unfolded state. In this way, the wheelchair 11 can be folded when not in use.

Furthermore, when the cared person P1 is not sitting on the seat 25, the load supported by the hydraulic jack 12 is only the seat 25, so the load on the hydraulic jack 12 can be reduced. Furthermore, when the cared person P1 is sitting on the seat 25, the load supported by the hydraulic jack 12 is the seat 25 and the cared person P1, and the load supported by the first frame 13, second frame 14, backrest 26, etc. No need to raise it. Therefore, the load on the hydraulic jack 12 can be reduced. Since the wheelchair 11 and the hydraulic jack 12 are provided separately, it is easy to operate the wheelchair 11 when changing between the folded state and the unfolded state. Moreover, it is possible to suppress an increase in the weight of the wheelchair 11, and it is possible to suppress an increase in the operating force applied to the first drive wheels 15 and the second drive wheels 16.

Furthermore, side guards may be provided on each of the first frame 13 and the second frame 14. The side guard is an element that prevents the clothes of the cared person P1 sitting on the seat portion 25 from coming into contact with the drive wheels 15 and 16 or from being caught in the drive wheels 15 and 16. The side guard may have the function of at least one of a guide section and a support section. With this configuration, the structure of the wheelchair 11 can be simplified without providing a dedicated guide section and support section.

An example of the technical meaning of the matters described in this embodiment is as follows. The wheelchair unit 10 is an example of a wheelchair unit. Wheelchair 11 is an example of a wheelchair. Hydraulic jack 12 is an example of an actuator. The drive wheel 15 is an example of a first drive wheel, and the drive wheel 16 is an example of a second drive wheel. The first frame 13 is an example of a first frame, and the second frame 14 is an example of a second frame. The seat 25 is an example of a seat. The backrest 26 is an example of a backrest. The support part 21 is an example of a first support part, and the support part 24 is an example of a second support part. The guide parts 19, 20, 22, and 23 also serve as an attachment/detachment mechanism. The guide parts 19 and 20 are examples of first guide parts. The guide parts 22 and 23 are examples of second guide parts. The receiving portion 37 is an example of a receiving portion. The backrest 26 and hinges 42, 43 are examples of changing mechanisms. The protrusion 34 is an example of a first protrusion, and the protrusion 35 is an example of a second protrusion. The engagement hole 36 is an example of a first engagement hole and a second engagement hole. A plan view of the wheelchair 11 viewed from directly above in the vertical direction is synonymous with "a plan view of the frame viewed from directly above in the vertical direction." FIG. 2B is an example of a "planar view of the frame viewed from directly above in the vertical direction."

This embodiment is not limited to what is disclosed using the drawings, and can be modified in various ways without departing from the gist thereof. For example, in this embodiment, the actuator that applies a pressing force to the seat includes, in addition to a hydraulic jack, a pneumatic jack, a combination of "an electric motor and a rack and pinion mechanism," and a solenoid actuator. In a plan view of the frame, the outer peripheral shape of the seat portion may be any one of a substantially rectangular shape, an elliptical shape, a circular shape, a track shape, and the like. The first guide portion may be singular or plural. The number of the plurality of first guide parts is not limited to two, and three or more may be provided. The second guide portion may be singular or plural. The number of the plurality of second guide parts is not limited to two, and three or more may be provided.

The first convex portion may be singular or plural. The plurality of first protrusions is not limited to two, but may be three or more. The second convex portion may be singular or plural. The number of the plurality of second convex portions is not limited to two, and three or more may be provided. The number of first engagement holes is the same as the number of first protrusions. The number of second engagement holes is the same as the number of second protrusions. Moreover, "extending in the height direction" includes the meaning of "along the height direction." Furthermore, "extended horizontally" includes the meaning "along the horizontal direction." Moreover, "extending in the front-back direction" includes the meaning of "along the front-back direction".

This embodiment can be used for a wheelchair and a wheelchair unit that can raise and lower a seat on which a cared person sits.

DESCRIPTION OF SYMBOLS 10... Wheelchair unit, 11... Wheelchair, 12... Hydraulic jack, 13, 14... Frame, 15... Drive wheel, 16... Drive wheel, 19, 20, 22, 23... Guide part, 21, 24... Support part, 25... Seat part, 26... Backrest, 34, 35... Convex part, 36... Engagement hole, 37... Receiving part, 42, 43... Hinge

Claims (8)

a frame to which a first drive wheel and a second drive wheel are attached;
a seat supported by the frame and on which a cared person sits;
a backrest provided on the frame and supporting the back of the cared person sitting on the seat;
In a wheelchair with
a support part provided on the frame and supporting the seat part at a predetermined position in the vertical direction;
an attachment/detachment mechanism provided on the frame and capable of attaching and detaching the seat to and from the support;
a receiving portion that is provided on the seat and receives a pressing force from an actuator that is placed under the seat in the vertical direction;
a guide part provided on the frame and configured to set the movement direction of the seat part separated from the support part in response to the pressing force of the actuator in the vertical direction;
a changing mechanism that allows the frame to be changed between an expanded state and a folded state when the seat portion is removed from the support portion;
Has a wheelchair. The wheelchair according to claim 1,
In the wheelchair, the guide section also serves as an attachment/detachment mechanism for attaching and detaching the seat section to and from the support section by moving the seat section in the vertical direction. The wheelchair according to claim 1 or 2,
The frame is
a first frame to which the first drive wheel is attached;
a second frame to which the second drive wheel is attached and arranged at a distance from the first frame in a direction intersecting the vertical direction;
has
The guide part is
a first guide portion provided on the first frame and extending along the vertical direction;
a second guide portion provided on the second frame and extending along the vertical direction;
has
The support part is
a first support part provided on the first frame;
a second support part provided on the second frame and arranged at the same position as the first support part in the vertical direction;
has
In the wheelchair, the first support part and the second support part support the seat part disposed between the first frame and the second frame at a predetermined position in the vertical direction. The wheelchair according to claim 3,
The first support portion has a first convex portion that projects upward in the vertical direction,
The second support part has a second convex part that projects upward in the vertical direction,
The seat portion is
a first engagement hole into which the first convex portion can enter and exit;
a second engagement hole into which the second convex portion can enter and exit;
Has a wheelchair. The wheelchair according to claim 1 or 2,
In the wheelchair, the receiving part is arranged at the center of the seat part when the frame is viewed from directly above in the vertical direction. The wheelchair according to claim 1 or 2,
The backrest has a configuration that can be expanded and folded,
In the wheelchair, the backrest also serves as the changing mechanism. a frame to which a first drive wheel and a second drive wheel are attached;
a seat supported by the frame and on which a cared person sits;
a backrest provided on the frame and supporting the back of the cared person sitting on the seat;
In a wheelchair unit having
a support part provided on the frame and supporting the seat part at a predetermined position in the vertical direction;
an attachment/detachment mechanism that allows the seat to be attached to and removed from the support;
an actuator placed under the seat in the vertical direction and generating a pressing force;
a receiving portion provided on the seat and receiving the pressing force of the actuator;
a guide part provided on the frame and configured to set the movement direction of the seat part separated from the support part in response to the pressing force of the actuator in the vertical direction;
a changing mechanism that allows the frame to be changed between an expanded state and a folded state when the seat portion is removed from the support portion;
wheelchair unit. The wheelchair according to claim 7,
In the wheelchair unit, the actuator is a hydraulic jack that applies a pressing force to the receiving part according to hydraulic pressure.

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