JP7201352B2 - handrims and wheelchairs - Google Patents

Description

The present invention relates to a wheelchair provided with handrims and a pair of wheels to which the handrims are attached.

2. Description of the Related Art Conventionally, a wheelchair is known in which hand rims are attached to wheels and a user can transmit driving force to the wheels via the hand rims (see, for example, Patent Document 1). The hand rim disclosed in Patent Document 1 has a cross section of the hand rim that is substantially elliptical or polygonal so that a user with weak gripping ability can easily grip the hand rim and rotate the wheel easily. be.

Japanese Patent Application Laid-Open No. 2000-225151

However, for users who have a weak grasping function and cannot hold the hand rim with their hands, even if the hand rim has an elliptical or polygonal cross-section, they cannot sufficiently grasp the hand rim. not be able to transmit enough force to rotate it.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is capable of transmitting a sufficient force to a wheel even for a user who has a weak grasping function and cannot hold a hand rim in a gripped state. To provide a hand rim and a wheelchair equipped with the same.

According to the present invention, the object is an annular hand rim attached to a wheel of a wheelchair that rotates about an axle, the hand rim extending in a circumferential direction about the axle and on which the user's thumb can be placed. a side portion having a side surface extending from an end of the outer peripheral portion in the vehicle width direction along the axle toward the axle; and the side portion facing the axle . and a bottom portion connected to an end of the wheel, wherein 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, and the second A length of 1 is such that when the user's thumb is placed on the outer peripheral surface and the user's index and middle fingers are extended in the circumferential direction, the user's index and middle fingers can be brought into contact with the side surface. The problem is solved by a hand rim characterized by having a length set equal to the length of the hand rim, and an end portion of the outer peripheral portion and the bottom portion, which is not connected to the side portion, forms a terminal end .

According to the handrim according to the above configuration, the first length of the side surface along the radial direction of the wheel is such that the user's thumb is placed on the outer peripheral surface of the outer peripheral portion, and the user's index finger and middle finger are placed on the outer peripheral surface of the outer peripheral portion. The length is set so that the index finger and the middle finger can be brought into contact with the side surface when extended in the circumferential direction. Therefore, even if the user does not grasp the hand rim, 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, so that the thumb and the ball of the foot are placed on the outer peripheral surface. It can be brought into contact with the outer peripheral surface, and can be brought into contact with the side surface of the forefinger, the middle finger, and about half of the palm. Since the contact area between the user's palm and the hand rim is sufficiently secured, the user can easily reach the wheel through the outer peripheral surface of the outer peripheral part and the side surface of the hand rim without gripping the hand rim with the hand. power can be transmitted.
In the handrim according to the present invention, preferably, the length of the side portion in the radial direction of the wheel is 30 mm or more and 70 mm or less.

The hand rim according to the present invention preferably includes an attachment mechanism for attaching the outer peripheral portion and the side portion to the rim portion of the wheel, wherein the attachment mechanisms are provided at a plurality of locations in the circumferential direction, and the outer peripheral portion and the A gap formed between the wheel and the wheel is adjustable, and the mounting mechanism includes a projecting portion that projects from the outer peripheral portion toward the rim portion in the vehicle width direction, and the projecting portion that is attached to the rim portion. A bolt and a nut, which are shaft-shaped members for fixing, are provided, and the projecting portion has an opening into which the bolt can be inserted and whose opening width in the vehicle width direction is wider than the opening width in the circumferential direction. A hole is formed, and the gap can be adjusted in a state in which the bolt is inserted into the opening hole .
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 attachment mechanism. Therefore, if the user's grasping function is weak and the hand rim cannot be held by hand, the width of the wheelchair can be reduced by narrowing the gap between the outer periphery and the wheel to the extent that the thumb cannot be inserted. can be narrowed. In addition, if the user has a sufficient grasping function and can hold the hand rim with the hand, the gap between the outer circumference and the wheel should be wide enough to allow the user to insert the thumb. can grip the hand rim and transmit force to the wheel.
Further, according to the hand rim according to the above configuration, the opening width in the vehicle width direction of the opening formed in the projecting portion is wider than the opening width in the circumferential direction. Therefore, it is possible to adjust the gap formed between the outer peripheral portion and the wheel while the shaft-like member is inserted into the opening. The gap can be fixed to an arbitrary width by adjusting the gap to an arbitrary width and then fixing the projecting portion to the rim portion with the shaft-like member. Further, the gap can be adjusted again to an arbitrary width by releasing the fixation by the shaft-like member.

In the handrim according to the present invention, preferably, the outer peripheral portion has an uneven shape in which the outer diameter changes in the circumferential direction.

Said problem is solved, according to the invention, by a wheelchair comprising a handrim according to any of the above and a pair of wheels to which said handrim is attached.
According to the wheelchair configured as described above, even a user who has a weak grasping function and cannot hold the hand rims with his/her hands can transmit sufficient force to the wheels.

ADVANTAGE OF THE INVENTION According to the present invention, a hand rim and a wheelchair equipped with the hand rim that can transmit a sufficient force to a wheel even for a user who has a weak grasping function and cannot hold the hand rim by hand. can provide.

It is a perspective view showing a wheelchair concerning one embodiment of the present invention. It is the figure which looked at the hand rim and rear wheel which are shown in FIG. 1 from the right side of a wheelchair. FIG. 3 is an end view of the hand rim and rear wheel shown in FIG. 2 taken along line I-I. FIG. 3 is a partially enlarged view of part II of FIG. 2 showing a state in which a user puts his or her hand on the hand rim; It is the figure which looked at the hand rim and rear wheel which are shown in FIG. 2 from the center side of a wheelchair. 6 is a cross-sectional view of the hand rim and rear wheel shown in FIG. 5 taken along the line III-III. FIG. FIG. 7 is an end view of the hand rim and rear wheel shown in FIG. 6 taken along line IV-IV. It is the figure which looked at the hand rim and rear wheel which are shown in FIG. 1 from the right side of a wheelchair.

Preferred embodiments of the invention are described in detail below with reference to the drawings. Since the embodiments described below are preferred specific examples of the present invention, various technically preferable limitations are applied. Unless otherwise stated, the invention is not limited to these modes. Further, in each drawing, the same constituent elements are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.

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

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

The seat portion 20 has a backrest portion 21 and a headrest 22 each made of a cushioning material having appropriate hardness and flexibility. The backrest portion 21 supports the back of the user seated on the seat surface portion 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 about the axle X1 and is attached to the frame portion 50 .
The front wheel 40 is a rotating member that rotates about a rotation axis and is attached to the frame portion 50 . The front wheels 40 are swingable about a swing axis extending in the vertical direction so as to be steerable by a caregiver.

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

The armrests 60 are for resting the elbows of the user seated on the seat surface 10, and are provided on both sides in the vehicle width direction along the axle X1 so as to sandwich the seat surface 10 therebetween.
The handle 70 is held by the hand of the caregiver, and is used to transmit the force of the caregiver to move the wheelchair 100 to the wheelchair.
The foot support portion 80 is a member that supports both feet of the user seated on the seat surface portion 10 . The foot support portion 80 is attached to the front end portion of the frame portion 50 .

The hand rim 90 is an annular member attached to the rear wheel 30 of the wheelchair 100 rotating around the axle X1. The hand rim 90 will be described in detail below with reference to the drawings.
2 is a view of the hand rim 90 and the rear wheel 30 shown in FIG. 1 as viewed from the right side of the wheelchair 100. FIG. FIG. 3 is an end view of the hand rim 90 and the rear wheel 30 shown in FIG. FIG. 4 is a partial enlarged view of a portion II of FIG. 2 showing a state in which a user places his or her hand on the hand rim 90. As shown in FIG.

As shown in FIG. 2, the hand rim 90 has an annular shape centered on the axle X1 and having an outer diameter D1 and an inner diameter D2. Outer diameter D1 of hand rim 90 is smaller than outer diameter D3 of 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 the end of the side portion 92 on the axle X1 side. , and an attachment mechanism 94 to be 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 an attachment mechanism 94 are integrally formed from a resin material.

The outer peripheral portion 91 has an outer peripheral surface 91a that extends in the circumferential direction around the axle X1 and on which the user's thumb FG1 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 periodically changes in the circumferential direction. Since the concave and convex 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 does not move against the outer peripheral surface 91a. Non-slip.

Instead of forming the uneven shape on the outer peripheral surface 91a, the outer peripheral surface 91a may be subjected to surface roughening such as embossing 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 surface roughening such as embossing or other non-slip processing. Further, 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 vehicle width direction end of the outer peripheral portion 91 toward the axle X1. The side surface 92a is a surface formed to extend substantially vertically. As shown in FIG. 3, a first length L1 of the side surface 92a along the radial direction of the rear wheel 30 is longer than a second length L2 of the outer peripheral surface 91a along the vehicle width direction.

The side surface 92a may have an uneven shape in which the length in the vehicle width direction changes periodically in the circumferential direction, or may be subjected to surface roughening such as embossing or other non-slip processing. Further, the side surface 92a may be made of a thermoplastic elastomer resin, or the side surface 92a may be subjected to a surface treatment such as applying a thermoplastic elastomer resin. By doing so, when the user transmits 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 non-slip processing on the outer peripheral surface 91a and the various non-slip processing on the side surface 92a may be performed on both or only one of them. Further, the type of anti-slip processing on the outer peripheral surface 91a and the type of anti-slip processing 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 the position where the outer diameter of the outer peripheral surface 91a in the vehicle width direction ends in a flat area and changes to a smaller outer diameter area. A boundary position between the bottom portion 93 and the side portion 92 is a position where the flat area of the outer diameter in the vehicle width direction of the bottom surface 93a ends and the area is switched to a smaller outer diameter area. In the hand rim 90, it is desirable to set the first length L1 to 30 mm or more and 70 mm or less, and set the second length L2 to 15 mm or more and 30 mm or less.

As shown in FIG. 4, the first length L1 is the distance between 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 stretched in the circumferential direction. is set to a length that allows contact with the side surface 92a. Also, 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 Japanese hand size data from the AIST human body size and shape database (published by the National Institute of Advanced Industrial Science and Technology, Digital Human Research Center), the minimum joint width of the second joint of the index finger FG2 is 14. .1 mm, with a maximum value of 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 hand width Hw has a minimum value of 67.1 mm. Here, the hand width Hw is the width of the head of the second metacarpal protruding most toward the thumb FG1 when the hand is stretched out, the index finger FG2, the middle finger FG3, the ring finger FG4, and the little finger FG5 are aligned and the thumb FG1 is abducted. It is the linear distance from the point to the point of the head of the fifth metacarpal that protrudes to the little finger FG5 side.

According to the aforementioned dimension data, the total joint width of the second joint of the index finger FG2 and the middle finger FG3 has a minimum value of 28.3 mm and a maximum value of 43.7 mm. A first length L1 that allows the two fingers of the index finger FG2 and the middle finger FG3 to come into contact with the side surface 92a is 30 mm or longer. According to the dimension data described above, 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 has a maximum value of 64.1 mm. The first length L1 that allows the three fingers of the index finger FG2, the middle finger FG3, and the ring finger FG4 to come into contact with the side surface 92a is about 65 mm at maximum.

Considering the above dimensional data, in the hand rim 90 of the present embodiment, the first length L1 is set to 30 mm or longer, which is longer than the sum 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, it is possible to bring two fingers, the index finger FG2 and the middle finger FG3, into contact with the side surface 92a. Also, by setting the first length L1 to 44 mm or more, it is possible to bring three fingers of the index finger FG2, the middle finger FG3, and the ring finger FG4 into contact with the side surface 92a.

If the first length L1 is smaller than 30 mm, the user, who has a weak grasping function and cannot hold the hand rim 90 in a gripped state, cannot secure a sufficient 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 91 a of the outer peripheral portion 91 of the hand rim 90 and the side surface 92 a of the side portion 92 .

Also, in the hand rim 90 of the present embodiment, the first length L1 may be set to 70 mm mm or less. A user with sufficient grasping ability can grasp the hand rim between the crotch of the thumb and the second joint of the index finger. According to the Japanese hand size data from the aforementioned AIST human body size and shape database (published by the National Institute of Advanced Industrial Science and Technology Digital Human Research Center), the length from the crotch of the thumb to the tip of the index finger has a maximum value of 126.4 mm, and the length of the index finger has a maximum value of 85.1 mm.

By setting the first length L1 to 70 mm or less, the first length L1 becomes shorter from the crotch of the thumb to the second joint of the index finger. As a result, a user having sufficient grasping ability can easily grasp the bottom portion 93 of the hand rim 90 . On the other hand, if the first length L1 is made larger than 70 mm, it becomes difficult for the user to grip the bottom portion 93 of the hand rim 90 .

According to the Japanese hand size data in the AIST human body size/shape database, the joint width of the first joint of the thumb FG1 has a minimum value of 15.8 mm. The second length L2 is preferably set to 15 mm or more and 30 mm or less so that the user's thumb FG1 can be placed on the outer peripheral surface 91a. The lower limit of 15 mm was determined from 15.8 mm, which is the joint width of the first joint of the thumb FG1. Also, the upper limit of 30 mm is a value determined so that the 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 the rotation direction about the axle X1 in which the hand rim 90 and the rear wheel 30 rotate integrally due to the driving force transmitted from the hand of the user to the hand rim 90 .

The bottom portion 93 has a bottom surface 93a that is connected to the end of the side portion 92 on the axle X1 side and extends 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 grasping function, the hand rim 90 can be reliably grasped 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 that protrudes 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 that extends 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 that protrudes toward the

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. 5 is a view of the hand rim 90 and the rear wheel 30 shown in FIG. 2 as seen from the center side of the wheelchair 100. FIG. FIG. 6 is a cross-sectional view of the hand rim 90 and the rear wheel 30 shown in FIG. 5 taken along line III-III. FIG. 7 is an end view of the hand rim 90 and the rear wheel 30 shown in FIG. 6 taken along line IV-IV. FIG. 8 is a view of the hand rim and rear wheel shown in FIG. 1 as viewed from the right side of the wheelchair.

As shown in FIG. 5, the mounting 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). In this case, four locations are arranged at intervals of 90° around the axle X1, but they may be arranged at arbitrary locations at arbitrary intervals, such as six locations at intervals of 60°.

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

The fastening bolt 94b is a shaft-like member for fixing the projecting portion 94a to the rim portion 31. As shown in FIG. A male thread is formed on the outer peripheral surface of the fastening bolt 94b. The fastening bolt 94b is fastened to the cap nut 94c with its head inserted into the hole formed in the rim portion 31 and its shaft portion inserted into the opening hole 94d of the projecting portion 94a. By fastening the cap nut 94c to the shaft portion of the fastening bolt 94b, the projecting portion 94a is sandwiched between them and attached to the rim portion 31. As shown in FIG.

As shown in FIG. 7, 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. It can be adjusted in the vehicle width direction. Therefore, the mounting mechanism 94 can adjust the clearance CL formed between the outer peripheral portion 91 and the rear wheel 30 . Here, the clearance CL refers to the shortest linear distance in the vehicle width direction between the outer peripheral portion 91 and the rim portion 31 . In this 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 clearance CL can be adjusted in the 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 shows a state in which 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, in the end view of the hand rim 90 and the rear wheel 30 shown in FIG. 8, the fastening bolt 94b is arranged at the left end position of the opening hole 94d and the clearance CL is adjusted to be the shortest as shown in FIG. It is a figure which shows.

The mounting mechanism 94 shown in FIGS. 6 and 7 has the head of the fastening bolt 94b arranged on the rim portion 31 side and the cap nut 94c arranged on the opening hole 94d side. good too. For example, a modified example in which the head of a butterfly bolt (not shown) is arranged on the opening hole 94d side and the nut (not shown) is arranged on the rim portion 31 side and fixed may be employed. According to this modified example, by manually turning the wing bolt by the operator, a fixed state in which the projecting portion 94a is attached to the rim portion 31 and a released state in which the projecting portion 94a can move relative to the rim portion 31 can be established. can be easily switched.

Actions and effects of the hand rims 90 included in the wheelchair 100 of the present embodiment described above will be described.
According to the hand rim 90 of this 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. Moreover, the length is set so that the user's index finger FG2 and middle finger FG3 can be brought into contact with the side surface 92a when the user's index finger FG2 and middle finger FG3 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 gripping the hand rim 90 with the hand. The ball of the thumb can be brought into contact with the outer peripheral surface 91a of the outer peripheral portion 91, and the index finger FG2, the middle finger FG3, and about half the area of the palm can be brought into contact with the side surface 92a of the side portion 92. Since a sufficient contact area between the palm of the user and the hand rim 90 is ensured, the user can touch 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 without gripping the hand rim 90 with the hand. Sufficient force can be transmitted to the rear wheel 30 via the .

In addition, according to the hand rim 90 of the present embodiment, since sufficient power can be transmitted to the rear wheel 30 without gripping the hand rim 90, the clearance CL between the hand rim 90 and the rear wheel 30 can be kept to a minimum width. It is possible to realize the narrowest possible vehicle width while securing sufficient seating space for small Japanese houses.

According to the hand rim 90 of the present embodiment, the clearance CL formed between the outer peripheral portion 91 and the rear wheel 30 can be adjusted by the attachment mechanism 94 . Therefore, if the user's grasping function is weak and the hand rim 90 cannot be held in a gripped state, the clearance CL is narrowed to such an extent that the thumb FG1 cannot be inserted between the outer peripheral portion 91 and the rear wheel 30. , the width of the wheelchair 100 can be narrowed. In addition, if the user has a sufficient grasping function and can hold the hand rim 90 in a gripped state, the clearance CL is such that the thumb FG1 can be inserted between the outer peripheral portion 91 and the rear wheel 30. , allowing the user to grip the hand rim 90 and transfer force to the rear wheel 30.

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

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the claims. Some of the configurations of the above embodiments may be omitted, or may be arbitrarily combined in a manner 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... armrest portion 70 handle 80 foot support portion 90 hand rim 91 outer peripheral portion 92 side portion 93 bottom portion 94 attachment 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 (5)

An annular handrim attached to a wheel of a wheelchair that rotates about an axle, comprising:
an outer peripheral portion extending in a peripheral 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 extending from an end portion of the outer peripheral portion in the vehicle width direction along the axle toward the axle;
a bottom portion connected to the axle-side end of the side portion;
with
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 such that when the user's thumb is placed on the outer peripheral surface and the user's index finger and middle finger are extended in the circumferential direction, the index finger and the middle finger are brought into contact with the side surface. is set to a possible length and
A hand rim , wherein an end portion of the outer peripheral portion and the bottom portion that is not connected to the side portion forms a terminal end . The hand rim according to claim 1, wherein the length of the side portion in the radial direction of the wheel is 30 mm or more and 70 mm or less . An attachment mechanism for attaching the outer peripheral portion and the side portion to the rim portion of the wheel,
The mounting mechanism is provided at a plurality of locations in the circumferential direction and is capable of adjusting a gap formed between the outer peripheral portion and the wheel,
The attachment mechanism is
a protruding portion protruding from the outer peripheral portion toward the rim portion in the vehicle width direction;
a bolt and a nut, which are shaft-shaped members for fixing the projecting portion to the rim;
The protruding portion is formed with an opening hole into which the bolt can be inserted and the opening width in the vehicle width direction is wider than the opening width in the circumferential direction,
3. The hand rim according to claim 1 , wherein the gap can be adjusted while the bolt is inserted into the opening . The hand rim according to any one of claims 1 to 3, wherein the outer peripheral portion has an uneven shape with an outer diameter that changes in the circumferential direction. a hand rim according to any one of claims 1 to 4;
and a pair of wheels to which the handrims are attached.

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