Wheelchair aids

Abstract

To provide an auxiliary tool for a wheelchair having both a function of lifting the front wheels of the wheelchair and a function of preventing the wheelchair from tilting backward. [Solution] A wheelchair assist device (12) that is attached to a wheelchair (11) having a frame (24), a support shaft (29) provided on the frame (24), and a rear wheel (18) rotatably supported by the support shaft (29), and has an attachment part that is attached to the frame (24), a pedal force receiving part that receives the pedal force of an assistant, and a leg part (37) that is provided on the attachment part, and the leg part (37) is rotatable around the attachment part, and is equipped with a first holder that stops the leg part (37) in a standby position, and a second holder that stops the leg part (37) in a usage position.

Description

[Technical Field]

[0001] The present disclosure relates to a wheelchair assist device provided on a wheelchair. [Background technology]

[0002] Examples of wheelchair assistive devices provided on wheelchairs are described in Patent Document 1, Patent Document 2, Non-Patent Document 1, and Non-Patent Document 2. The wheelchair auxiliary step (assistive device) described in Patent Document 1 is an auxiliary step attached to a step to allow the front wheels of a wheelchair to be lifted with a light force. The auxiliary step has step protrusions extending rearward from both the left and right steps, and step recesses connecting the step protrusions. By stepping on the auxiliary step with the foot while operating the wheelchair, the caregiver can easily lift the front wheels to go over steps, etc.

[0003] The wheelchair backward tip-over prevention device (assistant) described in Patent Document 2 drives the rear wheels on the left and right rear of the electric wheelchair with a motor inside a power unit attached to the inside surface of the rear wheels. Furthermore, brackets with an inverted concave cross section protrude from the rear of the left and right power units, and the front end of a swing arm with a tip-over prevention wheel axially attached to its rear end is rotatably attached to the bracket. Furthermore, the swing arm is biased by a spring so that the top of the swing arm hits a stopper attached to the upper rear part of the bracket.

[0004] Non-Patent Document 1 shows a diagram in which a tipping prevention device is provided on the tipping lever of a wheelchair to prevent the wheelchair from tipping backward.

[0005] Non-Patent Document 2 shows a diagram in which a tipping lever of a wheelchair is provided with an anti-tip bar to prevent the wheelchair from tipping backward. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 10-71174 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-170114 [Non-patent literature]

[0007] [Non-Patent Document 1] Seating Institute, Seating Course, Seating Basics, 1. Basic Structure and Name of Wheelchair, [Retrieved June 18, 2025], Internet<https: / / seating.jp / seating-lecture / seatingbasic / 01basic / > [Non-patent document 2] Wheel Chair Miki, wheelchair products, names and functions of wheelchair parts, [searched June 18, 2025], Internet<https: / / www.kurumaisu-miki.co.jp / wheelchair / column / detail.html> Summary of the Invention [Problem to be solved by the invention]

[0008] The inventors of the present application have recognized that the wheelchair assist devices described in Patent Document 1, Patent Document 2, Non-Patent Document 1, and Non-Patent Document 2 do not recognize wheelchair assist devices that have both the function of lifting the front wheels of the wheelchair to overcome steps and the function of preventing the wheelchair from tilting backward, and that there is room for improvement in this regard.

[0009] An object of the present disclosure is to provide an assistive device for a wheelchair that has both the function of lifting the front wheels of the wheelchair and the function of preventing the wheelchair from tilting backward. [Means for solving the problem]

[0010] The wheelchair auxiliary device disclosed herein is a wheelchair auxiliary device that is attached to a location behind the support axis of a wheelchair having a frame to which a front wheel is attached, a support axis that is positioned behind the front wheel and is provided on the frame, and a rear wheel that is rotatably supported by the support axis, and has an attachment part that is attached to the frame at a location behind the support axis, a pedal force receiving part that is connected to the attachment part and receives the pedal force of an assistant operating the wheelchair, and legs that are provided on the main body part, and the legs are rotatable around the attachment part when viewed from behind the wheelchair, and are configured to include a first holder that holds the legs so that the free ends of the legs stop at a standby position that is spaced a first predetermined distance from the location where the wheelchair is used, and a second holder that holds the legs so that the free ends of the legs stop at a usage position that is spaced a second predetermined distance from the location where the wheelchair is used that is less than the first predetermined distance. [Effects of the Invention]

[0011] According to the present disclosure, it is possible to provide a wheelchair assist device that has both the function of lifting the front wheels of the wheelchair and the function of preventing the wheelchair from tilting backward. In addition, when the wheelchair assist device is attached to the wheelchair, the legs can be operated to switch the position of the legs between a standby position and a use position. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a side view of the wheelchair stopped on flat ground. [Figure 2] FIG. 10 is a side view of the wheelchair going over a step. [Figure 3] FIG. 2 is an overall plan view of the wheelchair device. [Figure 4] FIG. 10 is a partial plan view showing an example of attaching and detaching a wheelchair assist device to and from a wheelchair. [Figure 5] 5(A) and (B) are partial rear views of the wheelchair. [Figure 6]6(A) and (B) are partial plan views showing a first modified example of a wheelchair auxiliary device, and FIG. 6(C) is a partial side cross-sectional view showing a second modified example of a wheelchair auxiliary device. DETAILED DESCRIPTION OF THE INVENTION

[0013] (Outline of the embodiment) The wheelchair device of this embodiment includes a wheelchair and a wheelchair assisting device. The wheelchair assisting device may be configured to be attachable to and detachable from the wheelchair. When attached to the wheelchair, the wheelchair assisting device can hold the legs in a standby position and a use position. When the legs of the wheelchair assisting device are held in the standby position, the front wheels of the wheelchair can be lifted by applying a pedaling force from an assistant to the pedaling force receiving portion. Furthermore, when the legs are held in the use position, the tips of the legs come into contact with the use position, thereby preventing the wheelchair from tilting backward. Specific examples of wheelchair devices, wheelchairs, and wheelchair assisting devices will be described with reference to the drawings.

[0014] (Specific examples of wheelchair devices and wheelchairs) The wheelchair device 10 shown in Figures 1, 2, and 3 is composed of a wheelchair 11 and a wheelchair assistive device 12. The wheelchair 11 is placed at a usage location 13 and used by a target person 14 in a seated position. The target person 14 may be a physically disabled person, a person requiring care, or the like. An assistant 15 assists the wheelchair 11 from behind, assisting with its use, such as stopping, moving, and changing direction. The assistant 15 may be a caregiver, a medical professional, or the like. The wheelchair 11 has a first frame 16, a second frame 17, a first rear wheel 18, a second rear wheel 19, a first front wheel 20, a second front wheel 21, a first foot support 22, and a second foot support 23. The first frame 16 has a first tipping lever 24 and a first push handle 25. The second frame 17 has a second tipping lever 26 and a second push handle 27 .

[0015] The first frame 16 and the second frame 17 are arranged at an interval in the left-right direction B1 of the wheelchair 11. A seat 28 is provided to connect the first frame 16 and the second frame 17. The seat 28 is where the subject 14 sits. The seat 28 is made up of a base material and a cushion that can be folded and unfolded.

[0016] The first frame 16 and the second frame 17 are made of pipes and are made of, for example, metal. The metal may be aluminum, steel, titanium, stainless steel, or the like. The first frame 16, the second frame 17, and the seat 28 support the weight of the subject 14. The first foot support 22 and the second foot support 23 are made of, for example, metal or synthetic resin. The feet of the subject 14 are placed on the first foot support 22 and the second foot support 23. When the wheelchair 11 is in use, the first front wheel 20, the second front wheel 21, the first rear wheel 18, and the second rear wheel 19 are in contact (ground) with the use location 13. The wheelchair 11 can move along the front-to-rear direction A1. Specifically, the wheelchair 11 can move forward, backward, and change direction.

[0017] The first tipping lever 24 is a rod-shaped pipe member and is arranged, i.e., extends, along the front-to-rear direction A1 of the wheelchair 11. The second tipping lever 26 is a rod-shaped pipe member and is arranged, i.e., extends, along the front-to-rear direction A1 of the wheelchair 11.

[0018] The first rear wheel 18 is rotatably supported by a first support shaft 29. The first support shaft 29 is attached to the first frame 16. The second rear wheel 19 is rotatably supported by a second support shaft 30. The second support shaft 30 is attached to the second frame 17. In the front-to-rear direction A1 of the wheelchair 11, the first support shaft 29 and the second support shaft 30 are arranged rearward of the first front wheel 20 and the second front wheel 21. The first support shaft 29 and the second support shaft 30 are arranged at the same position in the front-to-rear direction A1 of the wheelchair 11. The first support shaft 29 and the second support shaft 30 are arranged at the same position in the height direction of the wheelchair 11, i.e., in the vertical direction D1.

[0019] The outer diameter of the first rear wheel 18 is the same as the outer diameter of the second rear wheel 19. The outer diameters of the first rear wheel 18 and the second rear wheel 19 are larger than the outer diameters of the first front wheel 20 and the second front wheel 21. When the wheelchair 11 is in an unfolded and usable state and viewed from above as in Figure 3, the first tipping lever 24 and the second tipping lever 26 are arranged in parallel, and the first rear wheel 18 and the second rear wheel 19 are arranged in parallel.

[0020] (Examples of wheelchair aids) Specific examples of the wheelchair assist device 12 are shown in Figures 3, 4, 5(A) and 5(B). In the front-to-rear direction A1 of the wheelchair 11 shown in Figure 3, the rear end 31 of the first tipping lever 24 and the rear end 32 of the second tipping lever 26 are located rearward of the first support shaft 29 and the second support shaft 30. The wheelchair assist device 12 may be configured to be attachable to and detachable from the first tipping lever 24 and the second tipping lever 26.

[0021] The wheelchair assist device 12 has two mounting portions 33, 34, two step force receiving portions 35, 36, legs 37, 38, and a holder 39. The mounting portions 33, 34, step force receiving portions 35, 36, and legs 37, 38 may each be made of a pipe material. The mounting portions 33, 34, step force receiving portions 35, 36, and legs 37, 38 may each be made of a metal or a hard synthetic resin, for example. The metal may be selected from aluminum, steel, titanium, stainless steel, etc. The hard synthetic resin may be selected from polytetrafluoroethylene resin, phenolic resin, epoxy resin, etc.

[0022] Both ends of each of the pedal force receiving portions 35, 36 are fixed to the mounting portions 33, 34. The pedal force receiving portions 35, 36 are arranged parallel to each other with a gap between them. The mounting portions 33, 34 are also arranged parallel to each other. By moving the wheelchair assist device 12 in the front-to-rear direction A1 of the wheelchair 11, the wheelchair assist device 12 can be attached to and detached from the first tipping lever 24 and the second tipping lever 26.

[0023] Specifically, the attachment part 33 can be attached to the first tipping lever 24 and detached from the first tipping lever 24. In addition, the attachment part 34 can be attached to the second tipping lever 26 and detached from the second tipping lever 26.

[0024] When the attachment part 33 is attached to the first tipping lever 24, the rear end 31 of the first tipping lever 24 is inserted into the interior of the attachment part 33, which is a pipe material. When the attachment part 34 is attached to the second tipping lever 26, the rear end 32 of the second tipping lever 26 is inserted into the interior of the attachment part 34, which is a pipe material.

[0025] Note that a fixing element (not shown), for example, a screw member, is provided, and when the fixing element is tightened, the mounting portion 33 can be fixed to the first tipping lever 24, and the mounting portion 34 can be fixed to the second tipping lever 26. When the fixing element is loosened, the mounting portion 33 can be removed from the first tipping lever 24, and the mounting portion 34 can be removed from the second tipping lever 26.

[0026] The legs 37, 38 are disposed between the stepping force receiving portion 35 and the stepping force receiving portion 36. The leg 37 is connected to the mounting portion 33, and the leg 37 is movable around the mounting portion 33. The leg 38 is connected to the mounting portion 34, and the leg 38 is movable around the mounting portion 34. The legs 37, 38 are configured to transmit the stepping force applied to the stepping force receiving portions 35, 36 to the place of use 13.

[0027] 3, when the wheelchair assist device 12 is attached to the first tipping lever 24 and the second tipping lever 26, the stepping force receiving portions 35, 36 are spaced apart in the front-to-rear direction A1 of the wheelchair 11. Furthermore, when attached to the first tipping lever 24 and the second tipping lever 26, the legs 37, 38 are located between the stepping force receiving portion 35 and the stepping force receiving portion 36.

[0028] The holder 39 is an element that is stepped on by the foot 15A of the assistant 15, and has the function of supporting the legs 37, 38. The material of the holder 39 is hard synthetic resin or metal, and the holder 39 is placed on and supported by the stepping force receiving portions 35, 36. The holder 39 is configured to be movable along the stepping force receiving portions 35, 36 in FIG. 3, that is, slidable in the left-right direction B1. The holder 39 is movable within a predetermined range between the mounting portion 33 and the mounting portion 34.

[0029] (Example of wheelchair device use) An example of how the wheelchair device 10 is used is as follows: The wheelchair 11 is placed in a use state, with the first front wheel 20, the second front wheel 21, the first rear wheel 18, and the second rear wheel 19 in contact with the use location 13. The target person 14 sits on the seat 28 and places their feet on the first foot support 22 and the second foot support 23. The assistant 15 stands behind the wheelchair 11 at the use location 13. The wheelchair assisting device 12 is attached to the wheelchair 11. Here, the legs 37, 38 of the wheelchair assisting device 12 are located rearward of the rear ends of the first rear wheel 18 and the second rear wheel 19 in the fore-and-aft direction A1 of the wheelchair 11.

[0030] Furthermore, the legs 37, 38 of the wheelchair assist device 12 are held in a standby position. The standby position of the legs 37, 38 is a state in which the legs 37, 38 are held by the holder 39 and stopped in a substantially horizontal position. The position in the left-right direction of the wheelchair 11 where the holder 39 supports both the legs 37, 38 is the first predetermined position of the holder 39. As shown in FIG. 5(A), when the legs 37, 38 are held in the standby position, the tip 37A of the leg 37 and the tip 38A of the leg 38 are at the same position (height) as the mounting portions 33, 34 in the vertical direction D1. In the vertical direction D1, there is a first predetermined distance L1 between the tips 37A, 38A and the use location 13. When the legs 37, 38 are held in the standby position, the upper end of the holder 39 is located above the legs 37, 38 in the vertical direction D1.

[0031] When assistant 15 holds first push handle 25 and second push handle 27 with hands 15B and walks in a direction to move wheelchair 11 forward at use location 13, wheelchair 11 moves forward. Also, when assistant 15 holds first push handle 25 and second push handle 27 with hands 15B and walks in a direction to move wheelchair 11 backward at use location 13, wheelchair 11 moves backward. Furthermore, assistant 15 can also change the direction of wheelchair 11.

[0032] As shown in Figure 2, when there is a step C1 at the front of the wheelchair 11, the assistant 15 places one foot 15A on the holder 39 and applies a stepping force to the foot 15A. As a result, a moment F1 is applied to the first frame 16 and the second frame 17 in the clockwise direction in Figure 2 around the first support shaft 29 and the second support shaft 30. As a result, the first front wheel 20 and the second front wheel 21 are lifted up from the place of use 13.

[0033] Then, the assistant 15 moves the wheelchair 11 forward and places the first front wheel 20 and the second front wheel 21 on the upper step 13A of the use location 13. Next, the assistant 15 releases the feet 15A from the holders 39. Next, the assistant 15 moves the wheelchair 11 forward and the first rear wheel 18 and the second rear wheel 19 reach just in front of the step C1. Then, when the assistant 15 lifts the first push handle 25 and the second push handle 27, the wheelchair 11 lifts forward with the first front wheel 20 and the second front wheel 21 as fulcrums, and the first rear wheel 18 and the second rear wheel 19 move away from the use location 13.

[0034] Furthermore, the assistant 15 moves the wheelchair 11 forward with the first front wheel 20 and the second front wheel 21 in contact with the upper step 13A. Then, when the first rear wheel 18 and the second rear wheel 19 reach the top of the upper step 13A, the assistant 15 reduces the force supporting the first push handle 25 and the second push handle 27, causing the first rear wheel 18 and the second rear wheel 19 to contact with the upper step 13A. In this way, the wheelchair 11 can climb over the step C1.

[0035] On the other hand, with the wheelchair 11 stopped at the use location 13, the assistant 15 can grasp and operate the legs 37, 38 with their hands to move the legs 37, 38 from the standby position to the use position. Specifically, when the leg 37 shown in Fig. 5(A) is operated counterclockwise around the mounting part 33, the leg 37 stops by its own weight (gravity) at a position hanging down in a substantially vertical direction from the mounting part 33 as shown in Fig. 5(B).

[0036] Furthermore, when the leg 38 shown in FIG. 5(A) is rotated clockwise around the mounting portion 34, the leg 38 stops under its own weight at a position hanging down substantially vertically from the mounting portion 34 as shown in FIG. 5(B). The tip 37A of the leg 37 and the tip 38A of the leg 38, i.e., the lower end, are in a state immediately before touching the ground at the place of use 13. In the vertical direction D1, there is a second predetermined distance L2 between the tip 37A, 38A and the place of use 13. The second predetermined distance L2 is less than the first predetermined distance L1. Furthermore, in the fore-and-aft direction A1 of the wheelchair 11 shown in FIG. 3, the legs 37, 38 are located rearward of the rear end 18A of the first rear wheel 18 and the rear end 19A of the second rear wheel 19.

[0037] When the subject 14 leans back, a moment is applied to the wheelchair 11 about the first support shaft 29 and the second support shaft 30. Specifically, in the wheelchair 11 shown in FIG. 1, a clockwise moment F1 is generated about the first support shaft 29 and the second support shaft 30. As a result, the tip 37A of the leg 37 and the tip 38A of the leg 38 immediately contact the use location 13 at position P1. Position P1 is behind contact point P2, where the first rear wheel 18 and the second rear wheel 19 contact the use location 13. Contact point P2 is located directly below the first support shaft 29 and the second support shaft 30 in the vertical direction. This prevents the wheelchair 11 from tilting backward or tipping over backward.

[0038] When the wheelchair 11 is stopped and the leg 37 in the operating state is operated clockwise in Fig. 5(B), the leg 37 comes into contact with the holder 39, and the leg 37 is stopped in the standby state shown in Fig. 5(A). When the wheelchair 11 is stopped and the leg 38 in the operating state is operated counterclockwise in Fig. 5(B), the leg 38 comes into contact with the holder 39, and the leg 38 is stopped in the standby state shown in Fig. 5(A).

[0039] (Effects of the embodiment) By holding the legs 37, 38 in the standby position and the use position, the wheelchair assist device 12 can realize both the function of lifting the first front wheel 20 and the second front wheel 21 and the function of preventing the wheelchair 11 from tilting backward. This prevents an increase in the number of parts in the wheelchair 11. Furthermore, the wheelchair assist device 12 can be attached to and detached from the first tipping lever 24 and the second tipping lever 26 that are originally provided. Therefore, the shape and structure of the wheelchair 11 to which the wheelchair assist device 12 is attached are not limited, improving convenience.

[0040] Furthermore, while the wheelchair assist device 12 is attached to the wheelchair 11, the legs 37, 38 can be held in the standby position and the use position by grasping and operating the legs 37, 38 with the hands. In other words, there is no need to temporarily remove the wheelchair assist device 12 from the wheelchair 11, which improves the operability of the assistant 15.

[0041] Furthermore, the holder 39 has both a first role of transmitting the force of the foot 15A to the wheelchair assist device 12 and a second role of holding the legs 37, 38 in the standby position. Therefore, it is not necessary to provide a component performing the first role and a component performing the second role separately. Therefore, it is possible to prevent the number of components in the wheelchair device 10 from increasing.

[0042] (Change example 1) A first modification of the wheelchair assist device 12 will be described. For example, as shown in FIGS. 6(A) and 6(B), the dimension G1 of the holder 39 may be set so that the legs 37 and 38 are moved apart from the holder 39 when the holder 39 is moved along the force receiving portions 35 and 36. The dimension G1 of the holder 39 is the dimension in the left-right direction B1 of the wheelchair 11. When the legs 37 and 38 are held in the standby position as shown in FIG. 5(A), moving the holder 39 to the right along the force receiving portions 35 and 36 as shown in FIG. 6(A) moves the holder 39 away from the leg 37. Then, the leg 37 shown in FIG. 5(A) moves clockwise around the mounting portion 33 due to its own weight, and the leg 37 stops in the use state as shown in FIG. 5(B).

[0043] Furthermore, when the leg 38 is held in the standby position as shown in FIG. 5(A), moving the retainer 39 to the left along the force receiving portions 35, 36 as shown in FIG. 6(B) moves the retainer 39 away from the leg 38. Then, the leg 38 moves counterclockwise around the mounting portion 34 due to its own weight, and the leg 38 stops in the use state as shown in FIG. 5(B). In this way, the retainer 39 moves in the left-right direction of the wheelchair 11, and the retainer 39 moves away from the legs 37, 38. In other words, the retainer 39 is configured to release the holding force on the legs 37, 38.

[0044] 5(A) and 5(B), the operating range of the legs 37, 38 can be contained between the first rear wheel 18 and the second rear wheel 19. This prevents the operation of the legs 37, 38 from being hindered by the first rear wheel 18 and the second rear wheel 19. In other words, in the front-to-rear direction A1 of the wheelchair 11 shown in FIG. 3, the positions of the rear end 31 of the first tipping lever 24 and the rear end 32 of the second tipping lever 26 can be brought as close as possible to the first support shaft 29 and the second support shaft 30.

[0045] In other words, in a plan view of the wheelchair 11 shown in Figure 3, the range E1 by which the wheelchair auxiliary device 12 protrudes from the rear end 18A of the first rear wheel 18 and the rear end 19A of the second rear wheel 19 can be reduced as much as possible. Therefore, when the assistant 15 moves the wheelchair 11, the wheelchair auxiliary device 12 can be prevented from getting in the way of the feet 15A of the assistant 15. The range E1 is the amount of protrusion of the wheelchair auxiliary device 12 in the front-to-rear direction A1 of the wheelchair 11.

[0046] (Change example 2) A second modification of the wheelchair assist device 12 will now be described. Only one of the stepping force receiving portions 35 and 36 shown in FIGS. 3 and 4 may be provided, for example, only the stepping force receiving portion 36 as shown in FIG. 6(C). The retainer 39 is configured so as not to rotate around the stepping force receiving portion 36. For example, the stepping force receiving portion 36 may be formed of a metal pipe having a square cross section. The retainer 39 may also be attached to a metal pipe 40 that is attached to the outer periphery of the stepping force receiving portion 36. The cross section of the metal pipe 40 is square. The metal pipe 40 is configured to be movable in the left-right direction B1 along the stepping force receiving portion 36. In the second modification, the stepping force receiving portion 35 is not required, thereby reducing the number of parts of the wheelchair assist device 12.

[0047] (supplementary explanation) An example of the technical meaning of the matters described in this embodiment is as follows: The wheelchair device 10 is an example of a wheelchair device. The wheelchair 11 is an example of a wheelchair. The wheelchair assisting device 12 is an example of a wheelchair assisting device. The first front wheel 20 and the second front wheel 21 are an example of front wheels. The first rear wheel 18 and the second rear wheel 19 are an example of rear wheels. The first frame 16 and the second frame 17 are an example of frames. The first support shaft 29 and the second support shaft 30 are an example of support shafts.

[0048] The holder 39 is an example of a first holder. The attachment portions 33 and 34 are an example of a second holder. The attachment portions 33 and 34 are an example of an attachment portion. The attachment portion 33 is an example of a first attachment portion. The attachment portion 34 is an example of a second attachment portion. The step force receiving portions 35 and 36 are an example of a step force receiving portion. The legs 37 and 38 are an example of a leg portion. The leg portion 37 is an example of a first leg portion, and the leg portion 38 is an example of a second leg portion. The wheelchair 11 shown in Figures 5(A) and (B) is an example of a rear view of a wheelchair. The tip 37A is the free end of the first leg portion. The tip 38A is the free end of the second leg portion. The first predetermined distance L1 is an example of a first predetermined distance. The second predetermined distance L2 is an example of a second predetermined distance.

[0049] As shown in FIG. 5(A), legs 37, 38 are held by holder 39 and extended in a substantially horizontal direction, which is an example of a standby position. As shown in FIG. 5(B), leg 37, which is suspended from mounting portion 33 under its own weight and stops, is an example of a use position. As shown in FIG. 5(B), leg 38, which is suspended from mounting portion 34 under its own weight and stops, is an example of a use position. Wheelchair 11 shown in FIG. 3 is an example of a plan view of a wheelchair. First tipping lever 24 is an example of a first tipping lever. Second tipping lever 26 is an example of a second tipping lever. As shown in FIG. 6(A), the position where holder 39 is separated from leg 37, and as shown in FIG. 6(B), the position where holder 39 is separated from leg 38 are examples of second predetermined positions.

[0050] This embodiment is not limited to the one disclosed using the drawings, and various modifications are possible within the scope of the gist thereof. For example, the present invention may be configured such that the pipe-shaped attachment portion is fitted to the outside of the tipping lever, or the attachment portion is fitted to the inside of the pipe-shaped tipping lever. [Industrial Applicability]

[0051] This embodiment can be used as a wheelchair assist device that can be attached to a wheelchair. [Explanation of symbols]

[0052] 10...Wheelchair device, 11...Wheelchair, 12...Wheelchair assisting device, 16...First frame, 17...Second frame, 18...First rear wheel, 19...Second rear wheel, 20...First front wheel, 21...Second front wheel, 24...First tipping lever, 26...Second tipping lever, 29...First support shaft, 30...Second support shaft, 33, 34...Mounting portion, 35, 36...Pedal force receiving portion, 37, 38...Leg portion, 37A, 38A...Tip, 39...Retainer, L1...First predetermined distance, L2...Second predetermined distance

Claims

1. A wheelchair assisting device is attached to a position behind the support shaft of a wheelchair having a frame to which a front wheel is attached, a support shaft disposed behind the front wheel and provided on the frame, and a rear wheel rotatably supported by the support shaft, an attachment portion attached to the frame at a position rearward of the support shaft; a pedaling force receiving portion connected to the mounting portion and receiving a pedaling force of an assistant operating the wheelchair; a leg portion provided on the mounting portion; and The leg portion is rotatable about the attachment portion when viewed from behind the wheelchair, a first holder for holding the leg portion so as to stop the free end of the leg portion at a standby position spaced a first predetermined distance from a place where the wheelchair is used; a second holder for holding the leg so that the free end of the leg is stopped at a use position that is spaced a second predetermined distance from a place where the wheelchair is used that is less than the first predetermined distance; Equipped with The frame extends along the front-rear direction of the wheelchair and has a first tipping lever and a second tipping lever arranged parallel to each other in a plan view of the wheelchair, The mounting portion is a first attachment portion attached to the first tipping lever; a second attachment portion attached to the second tipping lever; and the pedal force receiving portion is connected to the first mounting portion and the second mounting portion, The leg portion is a first leg portion provided on the first mounting portion; a second leg portion provided on the second mounting portion; Including, the first holder is attached to the pedal force receiving portion so as to be movable in the left-right direction of the wheelchair, the first holder is configured to hold the first leg and the second leg so as to stop them at the standby positions when the first holder is at a first predetermined position in the left-right direction of the wheelchair, The wheelchair auxiliary device is configured so that the first holding device releases the holding force on the first leg portion and the second leg portion when the first holding device is in a second predetermined position in the left-right direction of the wheelchair.

2. The wheelchair assist device according to claim 1, The leg portion stopped at the use position transmits the tread force received by the tread force receiving portion to the use location.

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