JP2020010767A - Hand rim and wheelchair - Google Patents

Abstract

To provide a hand rim for enabling even a user with a weak grip function to transmit sufficient force to wheels.SOLUTION: A hand rim 90 includes: an outer periphery part 91 having an outer peripheral surface 91a that extends in a circumferential direction with an axle X1 as a center and where a thumb FG1 of a user can be placed; and a side part 92 having a side surface 92a that is formed to extend toward the axle X1 from an end part in a vehicle width direction along the axle X1 in the outer peripheral part 91. A first length L1 of the side surface 92a in a radial direction of a wheel 30 is longer than a second length of the outer peripheral surface 91a in a vehicle width direction. The first length L1 is set to have a length for allowing a forefinger FG2 and a middle finger FG3 of a user to have contact with the side surface 92a when a thumb FG1 of a user is placed on the outer peripheral surface 91a and also a forefinger FG2 and a middle finger FG3 are stretched in a circumferential direction Td.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a wheelchair including a hand rim and a pair of wheels to which the hand rim is attached.

  2. Description of the Related Art Conventionally, there has been known a wheelchair in which a hand rim is attached to a wheel and a user can transmit driving force to the wheel via the hand rim (for example, see Patent Literature 1). The hand rim disclosed in Patent Literature 1 is configured such that a cross section of the hand rim is formed into an almost elliptical shape or a polygonal shape, so that a user having a weak gripping function can easily grip and rotate the wheel easily. is there.

JP 2000-225151 A

  However, for a user who has a weak gripping function and cannot maintain a state in which the hand rim is grasped with a hand, the hand rim cannot be sufficiently gripped even with a hand rim having an elliptical or polygonal cross-section, and Cannot transmit enough force to rotate.

  The present invention has been made in order to solve the above-mentioned problem, and is intended to transmit a sufficient force to wheels even for a user who has a weak gripping function and cannot hold a hand rim in a hand. It is an object of the present invention to provide a hand rim and a wheelchair provided with the same.

  According to the present invention, the problem is an annular hand rim attached to a wheel of a wheelchair that rotates around an axle, and extends along a circumferential direction around the axle and can place a thumb of a user. An outer peripheral portion having an outer peripheral surface, and a side portion having a side surface formed so as to extend toward an axle from an end of the outer peripheral portion in a vehicle width direction along the axle, and a diameter of the wheel. A first length of the side surface along a direction is longer than a second length of the outer peripheral surface along the vehicle width direction, and the first length places a thumb of the user on the outer peripheral surface. And the hand rim is set to a length that allows the index finger and the middle finger to contact the side surface when the index finger and the middle finger of the user are extended in the circumferential direction. You.

  According to the hand rim according to the above configuration, the first length of the side surface along the radial direction of the wheel is such that the thumb of the user is placed on the outer peripheral surface of the outer peripheral portion, and the index finger and the middle finger of the user are placed on the outer peripheral surface. The length is set such that the index finger and the middle finger can be brought into contact with the side surface when extended in the circumferential direction. Therefore, the user can place the thumb on the outer peripheral surface and extend the index finger and the middle finger in the circumferential direction around the axle without holding the hand rim with the hand. The outer peripheral surface can be brought into contact with the forefinger, the middle finger, and about half the area of the palm, and the side surface can be brought into contact with the side surface. Since the contact area between the palm of the user and the hand rim is sufficiently ensured, the user does not need to grip the hand rim with his hand, so that the user has sufficient contact with the wheel via the outer peripheral surface of the outer periphery of the hand rim and the side surface of the side. Can transmit power.

In the hand rim according to the present invention, preferably, there is provided a mounting mechanism for mounting the outer peripheral portion and the side portion to a rim portion of the wheel, and the mounting mechanism is provided at a plurality of locations in the circumferential direction and the outer peripheral portion and the It is characterized in that the gap formed between the wheels can be adjusted.
According to the hand rim according to the above configuration, the gap formed between the outer peripheral portion and the wheel can be adjusted by the mounting mechanism. Therefore, if the gripping function of the user is weak and the hand rim cannot be held by hand, the clearance between the wheel and the wheelchair should be narrow enough to prevent the thumb from being inserted between the outer periphery and the wheel. Can be narrow. If the user has a sufficient gripping function and can hold the hand rim with his / her hand, the gap should be widened between the outer peripheral portion and the wheel so that the thumb can be inserted. Can grasp the hand rim and transmit the force to the wheels.

In the hand rim according to the present invention, preferably, the attachment mechanism includes a protrusion protruding from the outer peripheral portion toward the rim in the vehicle width direction, and a shaft for fixing the protrusion to the rim. And an opening hole, into which the shaft-like member can be inserted, and whose opening width in the vehicle width direction is larger than that in the circumferential direction, is formed in the protruding portion. And
According to the hand rim according to the above configuration, the opening width formed in the protruding portion is wider in the vehicle width direction than in the circumferential direction. Therefore, the gap formed between the outer peripheral portion and the wheel can be adjusted with the shaft-shaped member inserted into the opening hole. The gap can be fixed to an arbitrary width by adjusting the gap to an arbitrary width and then fixing the protruding portion to the rim by the shaft-shaped member. Further, by releasing the fixation by the shaft-shaped member, the gap can be adjusted to an arbitrary width again.

According to the present invention, the problem is solved by a wheelchair including the hand rim according to any of the above, and a pair of wheels to which the hand rim is attached.
According to the wheelchair having the above configuration, even a user who has a weak gripping function and cannot hold the hand rim with his / her hand can transmit a sufficient force to the wheel.

  According to the present invention, a hand rim capable of transmitting a sufficient force to wheels and a wheelchair including the same, even for a user who has a weak gripping function and cannot maintain a state in which the hand rim is gripped by hand, is provided. Can be provided.

It is a perspective view showing the wheelchair concerning one embodiment of the present invention. It is the figure which looked at the hand rim and rear wheel shown in FIG. 1 from the right side surface of the wheelchair. FIG. 3 is an end view of the hand rim and the rear wheel shown in FIG. FIG. 3 is a partially enlarged view of a portion II in FIG. 2 showing a state where a user places a hand on a hand rim. FIG. 3 is a view of the hand rim and the rear wheel shown in FIG. 2 as viewed from the center of a wheelchair. FIG. 6 is a sectional view of the hand rim and the rear wheel shown in FIG. FIG. 7 is an end view of the hand rim and the rear wheel shown in FIG. It is the figure which looked at the hand rim and rear wheel shown in FIG. 1 from the right side surface of the wheelchair.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that the embodiments described below are preferred specific examples of the present invention, and therefore, various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. It is not limited to these embodiments unless otherwise stated. In the drawings, similar components are denoted by the same reference numerals, and detailed description will be omitted as appropriate.

Hereinafter, a wheelchair 100 according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a wheelchair 100 according to the present embodiment.
As shown in FIG. 1, the wheelchair 100 includes a seat 10, a seat 20, a pair of rear wheels 30, a pair of front wheels 40, a frame 50, a pair of armrests 60, a handle 70, A pair of foot supports 80 and a pair of hand rims 90 are provided. The wheelchair 100 is a self-propelled wheelchair in which a user seated on the seat 10 moves by transmitting driving force to the rear wheel 30 via the hand rim 90. The wheelchair 100 can also be used as an assistance vehicle that allows an assistant to hold the handle 70 and move it forward.

  The seat surface portion 10 is a member that forms a seat surface on which a user sits, and is formed of a cushion material having appropriate hardness and flexibility. The seat surface 10 is supported by the frame 50.

  The seat portion 20 has a backrest portion 21 and a headrest 22, each of which is formed of a cushion material having appropriate hardness and flexibility. The backrest 21 supports the back of the user sitting on the seating surface 10. The headrest 22 supports the back of the user whose back is supported by the backrest 21.

The rear wheel 30 is a rotating member that rotates around the axle X1 and is attached to the frame unit 50.
The front wheel 40 is a rotating member that rotates around a rotation axis, and is attached to the frame unit 50. The front wheel 40 is swingable about a swing axis along the vertical direction so that the steering by the assistant can be performed.

  The frame part 50 supports each structural member of the wheelchair 100 including the seat part 10, the seat part 20, the rear wheel 30, and the front wheel 40. The frame section 50 is formed of, for example, a metal pipe in order to reduce the weight while having sufficient strength to support the weight of the user. The frame section 50 rotatably supports the pair of front wheels 40 so that the wheelchair 100 can be steered.

The armrests 60 are for placing the elbows of the user sitting on the seat 10 and are provided on both sides in the vehicle width direction along the axle X1 so as to sandwich the seat 10.
The handle 70 is used for transmitting a force for moving the wheelchair 100 to the wheelchair by the helper grasping the wheel with his / her hand.
The foot support 80 is a member that supports both feet of the user sitting on the seating surface 10. The foot support 80 is attached to the front end of the frame 50.

The hand rim 90 is an annular member attached to the rear wheel 30 of the wheelchair 100 that rotates around the axle X1. Hereinafter, the hand rim 90 will be described in detail with reference to the drawings.
FIG. 2 is a view of the hand rim 90 and the rear wheel 30 shown in FIG. FIG. 3 is an end view of the hand rim 90 and the rear wheel 30 shown in FIG. FIG. 4 is a partially enlarged view of a portion II in FIG. 2 showing a state in which the user places his or her hand on the hand rim 90.

  As shown in FIG. 2, the hand rim 90 is formed in an annular shape with the outer diameter D1 and the inner diameter D2, with the axle X1 as the center. The outer diameter D1 of the hand rim 90 is smaller than the outer diameter D3 of the rear wheel 30. As shown in FIG. 3, the hand rim 90 includes an outer peripheral portion 91 having an outer diameter D1, a side portion 92 connected to the outer peripheral portion 91, and a bottom portion 93 connected to an end of the side portion 92 on the axle X1 side. , A mounting mechanism 94 described later. The hand rim 90 is a member in which an outer peripheral portion 91, a side portion 92, a bottom portion 93, and a protruding portion 94a of a mounting mechanism 94 are integrally formed of a resin material.

  The outer peripheral portion 91 has an outer peripheral surface 91a extending along the circumferential direction around the axle X1 and on which the thumb FG1 of the user can be placed. The outer peripheral surface 91a has a flat shape in which the outer diameter does not change in the vehicle width direction, and has an uneven shape in which the outer diameter changes periodically in the circumferential direction. Since the uneven shape is formed in the circumferential direction, when the user places the thumb FG1 on the outer peripheral surface 91a and transmits a force along the circumferential direction to the outer peripheral surface 91a, the thumb FG1 moves to the outer peripheral surface 91a. Not slippery.

  Instead of forming the concavo-convex shape on the outer peripheral surface 91a, the outer peripheral surface 91a may be subjected to rough surface processing such as graining or other non-slip processing. Further, in addition to forming the uneven shape on the outer peripheral surface 91a, the outer peripheral surface 91a may be subjected to rough surface processing such as graining or other non-slip processing. The outer peripheral surface 91a may be formed of a thermoplastic elastomer resin, or may be subjected to surface processing such as applying a thermoplastic elastomer resin to the outer peripheral surface 91a.

  The side portion 92 has a side surface 92a formed to extend from the end of the outer peripheral portion 91 in the vehicle width direction toward the axle X1. The side surface 92a is a surface formed to extend in a substantially vertical direction. As shown in FIG. 3, the first length L1 of the side surface 92a along the radial direction of the rear wheel 30 is longer than the second length L2 of the outer peripheral surface 91a along the vehicle width direction.

  The side surface 92a may be formed with a concavo-convex shape in which the length in the vehicle width direction periodically changes in the circumferential direction, or may be subjected to rough surface processing such as embossing or other non-slip processing. Further, the side surface 92a may be formed of a thermoplastic elastomer resin, or may be subjected to surface processing such as applying a thermoplastic elastomer resin to the side surface 92a. By doing so, when the user transmits a force along the circumferential direction from the index finger FG2 and the middle finger FG3 to the side surface 92a, the index finger FG2 and the middle finger FG3 are less likely to slip on the side surface 92a. The various anti-slip processes on the outer peripheral surface 91a and the various anti-slip processes on the side surface 92a may be performed on both or only one of them. Further, the type of processing for preventing slip on the outer peripheral surface 91a and the type of processing for preventing slip on the side surface 92a may be the same type or different types.

  As shown in FIG. 3, the boundary position between the outer peripheral portion 91 and the side portion 92 is a position where the region where the outer diameter of the outer peripheral surface 91a in the vehicle width direction is flat ends and the region is switched to a region where the outer diameter becomes smaller. The boundary position between the bottom portion 93 and the side portion 92 is a position where the region where the outer diameter of the bottom surface 93a in the vehicle width direction is flat ends and the region is switched to a region where the outer diameter becomes smaller. In the hand rim 90, it is desirable that the first length L1 is set to 30 mm or more and 70 mm or less, and the second length L2 is set to 15 mm or more and 30 mm or less.

  As shown in FIG. 4, the first length L1 is such that the index finger FG2 and the middle finger FG3 when the user's thumb FG1 is placed on the outer peripheral surface 91a and the user's index finger FG2 and middle finger FG3 are extended in the circumferential direction. Is set to a length that allows the contact with the side surface 92a. In addition, the first length L1 may be set to a length that allows the ring finger FG4 to contact the side surface 92a in addition to the index finger FG2 and the middle finger FG3.

  According to the size data of the Japanese hand of the AIST human body size and shape database (publisher: National Institute of Advanced Industrial Science and Technology), the minimum joint width of the second joint of the index finger FG2 is 14 .1 mm, the maximum value is 21.5 mm. The joint width of the second joint of the middle finger FG3 has a minimum value of 14.2 mm and a maximum value of 22.0 mm. The joint width of the second joint of the ring finger FG4 has a minimum value of 13.3 mm and a maximum value of 20.4 mm. The minimum value of the hand width Hw is 67.1 mm. Here, the hand width Hw refers to the second metacarpal head with the forefinger FG2, the middle finger FG3, the third finger FG4, the little finger FG5 aligned, and the thumb FG1 abducted. It refers to the linear distance from the point to the point of the fifth metacarpal head that protrudes closest to the little finger FG5.

  According to the above-described dimensional data, the minimum value of the joint width of the second joint of the two fingers of the index finger FG2 and the middle finger FG3 is 28.3 mm, and the maximum value is 43.7 mm. The first length L1 at which the two fingers of the index finger FG2 and the middle finger FG3 can contact the side surface 92a is 30 mm or more. According to the dimensional data described above, the maximum value of the total joint width of the second joints of the three fingers of the index finger FG2, the middle finger FG3, and the ring finger FG4 is 64.1 mm. The first length L1 at which the three fingers of the index finger FG2, the middle finger FG3, and the ring finger FG4 can be brought into contact with the side surface 92a is about 65 mm at the maximum.

  In consideration of the above dimensional data, in the hand rim 90 of the present embodiment, the first length L1 is set to 30 mm or more longer than the total value of the minimum joint widths of the second joints of the index finger FG2 and the middle finger FG3, More preferably, it is set to 44 mm or more. By setting the first length L1 to 30 mm or more, two fingers, the index finger FG2 and the middle finger FG3, can be brought into contact with the side surface 92a. Further, by setting the first length L1 to be equal to or greater than 44 mm, it is possible to make the three fingers of the index finger FG2, the middle finger FG3, and the ring finger FG4 contact the side surface 92a.

  If the first length L1 is smaller than 30 mm, a user who has a weak gripping function and cannot hold the hand rim 90 with his / her hand cannot sufficiently secure a contact area between the palm and the hand rim 90. . Therefore, sufficient force cannot be transmitted to the rear wheel 30 via the outer peripheral surface 91a of the outer peripheral portion 91 of the hand rim 90 and the side surface 92a of the side portion 92.

  Further, in the hand rim 90 of the present embodiment, the first length L1 may be set to 70 mmmm or less. A user having a sufficient gripping function can grip the hand rim between the crotch of the thumb and the second joint of the index finger. According to the dimension data of the Japanese hand of the AIST human body size and shape database (publisher: National Institute of Advanced Industrial Science and Technology, Digital Human Research Center), the length from the forefinger of the thumb to the tip of the index finger Since the maximum value is 126.4 mm and the length of the index finger is the maximum value of 85.1 mm, the distance from the thumb crotch to the second joint of the index finger is about 70 mm at the maximum.

  By setting the first length L1 to be equal to or less than 70 mm, the first length L1 is shorter than the second joint of the forefinger from the forefinger of the thumb. Thus, a user having a sufficient gripping function can easily grip the bottom 93 of the hand rim 90. On the other hand, if the first length L1 is larger than 70 mm, it becomes difficult for the user to grip the bottom 93 of the hand rim 90.

  According to the Japanese hand size data of the AIST human body size / shape database, the minimum value of the joint width of the first joint of the thumb FG1 is 15.8 mm. The second length L2 is desirably set to 15 mm or more and 30 mm or less in order to place the thumb FG1 of the user on the outer peripheral surface 91a. The lower limit of 15 mm was determined from the joint width of the first joint of the thumb FG1 of 15.8 mm. The upper limit of 30 mm is a value determined so that the wheel width of the wheelchair 100 does not become too large. The second length L2 is set to be shorter than the first length L1.

  Here, the circumferential direction Td in which the user's index finger FG2 and middle finger FG3 are extended refers to the tangential direction of the outer peripheral surface 91a at the position P1 where the thumb FG1 is placed. In FIG. 4, the rotation direction Rd indicates a rotation direction around the axle X1 in which the hand rim 90 and the rear wheel 30 rotate integrally by the driving force transmitted from the user's hand to the hand rim 90.

  The bottom portion 93 is connected to an end of the side portion 92 on the axle X1 side, and has a bottom surface 93a formed to extend toward the center of the wheelchair 100 along the vehicle width direction. The bottom surface 93a is formed substantially parallel to the outer peripheral surface 91a. Therefore, when the user has a sufficient gripping function, the hand rim 90 can be reliably gripped by holding the outer peripheral surface 91a and the bottom surface 93a between the hands. The hand rim 90 has an outer peripheral portion 91 protruding from the upper end of the side portion 92 toward the center of the wheelchair 100 along the vehicle width direction, and a bottom portion 93 from the lower end of the side portion 92 toward the center of the wheelchair 100 along the vehicle width direction. It has a shape protruding toward.

  Next, an attachment mechanism 94 for attaching the outer peripheral portion 91, the side portion 92, and the bottom portion 93 of the hand rim 90 to the rim portion 31 of the rear wheel 30 will be described with reference to the drawings. FIG. 5 is a view of the hand rim 90 and the rear wheel 30 shown in FIG. FIG. 6 is a sectional view of the hand rim 90 and the rear wheel 30 shown in FIG. FIG. 7 is an end view of the hand rim 90 and the rear wheel 30 shown in FIG. FIG. 8 is a view of the hand rim and the rear wheel shown in FIG. 1 as viewed from the right side of the wheelchair.

  As shown in FIG. 5, the attachment mechanisms 94 are provided at a plurality of positions in the circumferential direction of the hand rim 90 at equal intervals (90 ° intervals around the axle X1). Here, four positions are arranged at 90 ° intervals around the axle X1, but they may be arranged at arbitrary positions at arbitrary intervals, such as six positions at 60 ° intervals.

  As shown in FIGS. 6 and 7, the mounting mechanism 94 has a protruding portion 94a, a fastening bolt (shaft member) 94b, and a cap nut (fastening nut) 94c. The protrusion 94a is a member that protrudes from the outer peripheral portion 91 toward the rim 31 in the vehicle width direction. An opening 94d into which the fastening bolt 94b can be inserted is formed in the protrusion 94a. The opening width W2 in the vehicle width direction of the opening hole 94d is wider than the opening width W1 in the circumferential direction.

  The fastening bolt 94b is a shaft-shaped member for fixing the protrusion 94a to the rim 31. A male screw is formed on the outer peripheral surface of the fastening bolt 94b. The fastening bolt 94b is fastened to the cap nut 94c with the head inserted into the hole formed in the rim portion 31 and the shaft inserted into the opening 94d of the protrusion 94a. When the cap nut 94c is fastened to the shaft of the fastening bolt 94b, the protruding portion 94a is sandwiched therebetween and is attached to the rim 31.

  As shown in FIG. 7, since the opening width W2 of the opening hole 94d in the vehicle width direction is wider than the outer diameter of the shaft portion of the fastening bolt 94b, the position of the protrusion 94a fixed with the fastening bolt 94b and the cap nut 94c is It can be adjusted in the vehicle width direction. Therefore, the mounting mechanism 94 can adjust the gap CL formed between the outer peripheral portion 91 and the rear wheel 30. Here, the gap CL refers to the distance between the outer peripheral portion 91 and the rim portion 31 where the linear distance in the vehicle width direction is the shortest. In the present embodiment, when the thickness of the shaft portion of the fastening bolt 94b is set to 5 mm and the opening width W2 is set to 5 mm or more and 35 mm or less, the gap CL can be adjusted within a range of 0 mm or more and 30 mm or less.

  The end view of the hand rim 90 and the rear wheel 30 shown in FIG. 3 is a diagram showing a state where the fastening bolt 94b is arranged at the right end position of the opening hole 94d shown in FIG. 7 and the clearance CL is adjusted to be the shortest. . On the other hand, the end view of the hand rim 90 and the rear wheel 30 shown in FIG. 8 shows a state in which the fastening bolt 94b is arranged at the left end position of the opening hole 94d and the gap CL is adjusted to be the shortest as shown in FIG. FIG.

  The attachment mechanism 94 shown in FIGS. 6 and 7 has the head of the fastening bolt 94b disposed on the rim 31 side and the cap nut 94c disposed on the opening 94d side. Is also good. For example, a modified example in which the head of a wing bolt (not shown) is arranged on the side of the opening hole 94d, and a nut (not shown) is arranged and fixed on the rim portion 31 side may be adopted. According to this modification, when the worker turns the wing bolt by hand, a fixed state in which the protrusion 94a is attached to the rim 31 and a released state in which the protrusion 94a is movable with respect to the rim 31 are provided. Can be easily switched.

The operation and effect of the hand rim 90 included in the wheelchair 100 of the present embodiment described above will be described.
According to the hand rim 90 of the present embodiment, the first length L1 of the side surface 92a of the side portion 92 along the radial direction of the rear wheel 30 is such that the user's thumb FG1 is placed on the outer peripheral surface 91a of the outer peripheral portion 91. The length is set such that the index finger FG2 and the middle finger FG3 can be brought into contact with the side surface 92a when the index finger FG2 and the middle finger FG3 of the user are extended in the circumferential direction Td. Therefore, the user can place the thumb on the outer peripheral surface 91a and extend the index finger FG2 and the middle finger FG3 in the circumferential direction Td around the axle X1 without grasping the hand rim 90 with the hand, so that the thumb FG1 The thumb ball can be brought into contact with the outer peripheral surface 91 a of the outer peripheral portion 91, and the forefinger FG 2, the middle finger FG 3, and approximately half of the palm can be brought into contact with the side surface 92 a of the side portion 92. Since the contact area between the palm of the user and the hand rim 90 is sufficiently ensured, the user does not need to hold the hand rim 90 with his / her hand, and the outer peripheral surface 91a of the outer peripheral portion 91 of the hand rim 90 and the side surface 92a of the side portion 92. , A sufficient force can be transmitted to the rear wheel 30.

  Further, according to the hand rim 90 of the present embodiment, sufficient power can be transmitted to the rear wheel 30 without grasping the hand rim 90 with a hand, so that the clearance CL between the hand rim 90 and the rear wheel 30 is minimized. It is possible to realize the narrowest possible vehicle width for a small Japanese house with sufficient seating space.

  According to the hand rim 90 of the present embodiment, the gap CL formed between the outer peripheral portion 91 and the rear wheel 30 can be adjusted by the attachment mechanism 94. Therefore, when the gripping function of the user is weak and the hand rim 90 cannot be held by hand, the gap CL is reduced to such an extent that the thumb FG1 cannot be inserted between the outer peripheral portion 91 and the rear wheel 30. Thus, the width of the wheelchair 100 can be reduced. When the user has a sufficient gripping function and can hold the hand rim 90 by hand, the clearance CL is large enough to allow the thumb FG1 to be inserted between the outer peripheral portion 91 and the rear wheel 30. And the user can grip the hand rim 90 and transmit the force to the rear wheel 30.

  According to the hand rim 90 of the present embodiment, the opening hole 94d formed in the projecting portion 94a has an opening width W2 in the vehicle width direction larger than the opening width W1 in the circumferential direction. Therefore, the gap CL formed between the outer peripheral portion 91 and the rear wheel 30 can be adjusted in a state where the fastening bolt 94b is inserted into the opening hole 94d. The gap CL can be fixed to an arbitrary width by adjusting the gap CL to an arbitrary width and then fixing the protrusion 94a to the rim 31 with the fastening bolt 94b and the cap nut 94c. Further, by releasing the fixing by the fastening bolt 94b, the gap CL can be adjusted to an arbitrary width again.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the scope of the claims. The configuration of the above embodiment can be partially omitted or arbitrarily combined so as to be different from the above.

DESCRIPTION OF SYMBOLS 10 ... Seat part, 20 ... Seat part, 21 ... Backrest part, 22 ... Headrest, 30 ... Rear wheel, 40 ... Front wheel, 50 ... Frame part, 60 ... · Armrests, 70 · Handle, 80 · Foot support, 90 · Hand rim, 91 · Peripheral, 92 · Side, 93 · Bottom, 94 · Mounting mechanism , 94a: Projecting portion, 94b: Fastening bolt, 94c: Cap nut, 94d: Opening hole, 94d: Fastening nut, 100: Wheelchair, FG1: Thumb, FG2 ..Index finger, FG3 ... Middle finger, FG4 ... Ring finger, X1 ... Axle

Claims (4)

An annular hand rim attached to a wheelchair wheel that rotates about an axle,
An outer peripheral portion extending along the circumferential direction around the axle and having an outer peripheral surface on which a user's thumb can be placed;
A side portion having a side surface formed to extend toward the axle from an end of the outer peripheral portion in the vehicle width direction along the axle,
A first length of the side surface along the radial direction of the wheel is longer than a second length of the outer peripheral surface along the vehicle width direction,
The first length is that the thumb of the user is placed on the outer peripheral surface, and the index finger and the middle finger of the user are brought into contact with the side surface when the index finger and the middle finger of the user are extended in the circumferential direction. A hand rim characterized in that the length is set to be possible. An attachment mechanism for attaching the outer peripheral portion and the side portion to a rim portion of the wheel,
The hand rim according to claim 1, wherein the attachment mechanism is provided at a plurality of positions in the circumferential direction and is capable of adjusting a gap formed between the outer peripheral portion and the wheel. The attachment mechanism,
A projecting portion projecting from the outer peripheral portion toward the rim portion in the vehicle width direction;
A shaft-shaped member for fixing the protrusion to the rim,
3. The opening according to claim 2, wherein the protruding portion is formed with an opening hole into which the shaft-shaped member can be inserted and an opening width in the vehicle width direction is wider than the opening width in the circumferential direction. Hand rim. A hand rim according to any one of claims 1 to 3,
A wheelchair comprising: a pair of wheels to which the hand rim is attached.

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