JP3045741U - Wheelchair wheel structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a wheelchair wheel structure capable of easily changing the clearance (clearance) between a hand rim and a wheel after the purchase of the wheelchair. A wheelchair including a main wheel, a hand rim, and hand rim attachment means for attaching the hand rim to the main wheel, wherein a member constituting the hand rim attachment means defines a clearance between the main wheel and the hand rim. In the above wheel structure, the member that defines the clearance is a member separate from the main wheel and the hand rim, and is configured to be replaceable with a member of the same type that defines a different clearance.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a wheelchair wheel structure, and more particularly, to a wheelchair wheel structure that can easily change the clearance (clearance) between a hand rim and a wheel after purchasing the wheelchair.

[0002]

[Prior art]

 FIG. 5 is an exploded perspective view showing a configuration of a wheel structure of a conventional wheelchair. As shown in FIG. 5, the wheel of a wheelchair is composed of a main wheel 10 and a hand rim 1 attached to a side thereof. The hand rim 1 is formed of a circular pipe, and a plurality of support rods 2 are welded inside the pipe. The ends of the support rods 2 are each formed flat, and a hole 3 having a predetermined diameter is formed substantially at the center of the flat surface. On the other hand, a blind nut (female screw structure) 12 is provided on the inner surface 11 of the rim of the main wheel 10 at a position corresponding to the support rod 2 of the hand rim. The hole 3 and the blind nut 12 are fixed with bolts 35 so that the hand rim 1 is attached to the main wheel 10.

[0003] The use of wheelchairs can be broadly divided into public ones, which are always available at hospitals and airports and rented as needed, and those used by individuals with disabilities personally. The former is called a standard product and is made with approximately standard structure and dimensions, but those that are used personally by persons with disabilities are suitable for the size of the user's body and the degree of disability. A maid is produced. In such custom-made wheelchairs, the thickness, outer diameter, material, and distance (clearance) between the main wheel and the hand rim are selected according to the user's preference. In a conventional wheelchair as described above, the clearance between the main wheel and the hand rim is determined by the length of the support bar fixed to the hand rim. The clearance should be easy to grasp the hand rim.

[0004]

[Problems to be solved by the invention]

 As described above, in the conventional wheelchair, since the ring of the hand rim 1 and the support rod 2 are fixed by welding, the clearance between the main wheel and the hand rim (hereinafter simply referred to as the clearance) is the length of the hand rim support rod selected at the time of purchase. It was decided by that and it was not easy to change thereafter. However, setting the clearance of the hand rim depends on the user's feelings and usability, so it differs from the size problem such as the size and height of the wheelchair seat, and the problem is noticed after actually using it for a certain period of time. There are few cases. Also, after setting the clearance at the wheelchair vendor and bringing it home, the user may wish to change the clearance after purchase in real life.

In such a case, the only way to change the clearance of the hand rim is to purchase a new hand rim and replace the entire hand rim because the support bar is welded to the hand rim in the conventional wheelchair. Also, when a wheelchair user wants to change the clearance of the hand rim on the go, he or she must go out with a hand rim with a different length of the support rod and change it on the go, which is inconvenient to carry. . In order to solve such a problem, the purpose of the present invention is to make it possible to easily change the clearance of the hand rim after the purchase of a wheelchair, and to replace the clearance required for the clearance with an inexpensive and small bulky wheelchair. It is to provide a wheel structure.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the wheelchair wheel structure of the present invention includes a main wheel, a hand rim, and hand rim attachment means for attaching the hand rim to the main wheel. In the wheel structure of a wheelchair that defines a clearance between a main wheel and a hand rim, a member that defines the clearance is a separate member from the main wheel and the hand rim, and a member of the same type that defines a different clearance. It is characterized by being configured to be exchangeable.

As described above, according to the present invention, a member is provided between the main wheel and the hand rim, the member defines a clearance between the main wheel and the hand rim, and the member is replaced. Since it is possible to change the clearance by changing to a member that specifies a different clearance, compared to the wheel structure of a conventional wheelchair where the entire hand rim was replaced when changing the clearance, Replacement parts can be much smaller. Therefore, the clearance between the main wheel and the hand rim can be changed easily and inexpensively. Note that nuts having different lengths (heights) and bolts having different lengths or screw lengths can be suitably used for this member.

[0008]

[Embodiment of the invention]

 An embodiment of the wheel structure of a wheelchair of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing the configuration of the embodiment of the wheel structure according to the present invention. In the embodiment shown in FIG. 1, the hand rims 20 are attached to the main wheel 10 at four attachment points provided at equal intervals. FIG. 2 is an enlarged view showing the configuration of one of the mounting locations.

As shown in FIG. 2, a blind nut 12 is provided on the inner surface 11 of the rim of the main wheel 10 of the wheelchair, while a blind is provided on the inner side (main wheel side) of the hand rim 20. A nut 21 is provided. A plate head bolt 30 having a plate-shaped head 31 is attached to a blind nut 21 on the side of the hand rim 20, and a hole 32 penetrating through substantially the center of the head 31 of the plate head bolt 30 is provided on the main wheel side. The hand rim 20 is fixed to the main wheel 10 by attaching a bolt 35 to the blind nut 12.

The plate head bolt 30 is attached to a blind nut 21 provided on the hand rim 20 via a nut 40. The clearance between the main wheel 10 and the hand rim 20 is determined by the height of the nut 40. FIG. 3 is a diagram illustrating a hand rim attachment member used for the wheel structure according to the present embodiment. The mounting member of this embodiment includes four types of nuts 40a to 40d having different lengths and two types of plate head bolts 30a and 30b having different lengths. Each of the nuts 40a to 40d has the same inner diameter, and each of the plate head bolts 30a and 30b has the same outer diameter. In this example, since the hand rim is attached at four locations, four parts are provided. By selecting a member having an appropriate length from the plate head bolts 30a and 30b and the nuts 40a to 40d having different lengths according to the requirements of the user of the wheelchair, the main wheel 10 and the hand rim 20 can be connected to each other. Adjust the clearance between.

A description will be given of a process of attaching the hand rim in the wheel structure of the present embodiment. First, a nut 40 having a length approximately suitable for a desired clearance is selected, and a plate head bolt 30 having a length suitable for the nut is screwed. The longer nuts (40a, 40b) are combined with the longer plate head bolts 30a, and the shorter nuts (40c, 40d) are combined with the shorter plate head bolts 30b. The tip of the threaded portion 33 of the plate head bolt 30 is projected from the end of the nut 40 and screwed into the blind nut 21 of the hand rim 20 to attach the plate head bolt 30 to the hand rim 20. At this time, the plate head bolt 30 is attached to the main wheel 10 with the bolt 35 via the washer 36 so that the plate head 32 of the plate head bolt 30 at each mounting position is along the inner surface 11 of the rim of the main wheel 10. Fix it.

In this step, the clearance can be further finely adjusted by adjusting the screwing state between the plate head bolt 30 and the blind nut 21 before attaching the hand rim 20 to the main wheel 10. For example, when the screw pitch of the plate head bolt 30 is set to 1 mm and the screwing state between the blind nut 21 of the hand rim 20 and the plate head bolt 30 is adjusted, 0.5 mm for 1/2 turn of the bolt and 0.5 mm for the bolt 1 The fine adjustment of the clearance of 1mm can be performed by rotation. If necessary, the plate head bolt 30 is rotated several times or several half times to obtain a desired clearance, and then the hand rim 20 is mounted on the main wheel 10. When the plate head bolt 30 is fixed to the main wheel 10, the plate head bolt 30 no longer rotates, so that the clearance does not go out and the bolt 30 does not come off from the blind nut 21.

As described above, in the wheel structure of the present invention, the hand rim 20 is attached to the main wheel 10 by replaceable members (the plate head bolts 30 and the nuts 40) separate from the hand rim 20. The clearance between the main wheel 10 and the hand rim 20 can be changed by replacing the rim with a different length. That is, several types of plate head bolts 30 and nuts 40 having different lengths are prepared in advance, and the clearances can be set by combining them according to the customer's request. Since the plate head bolts 30 and the nuts 40 can be manufactured or sold at a lower cost than the entire hand rim, the clearance can be changed at a much lower cost than when the entire hand rim including the ring is replaced. Also, when you want to change the clearance of the hand rim when you go out, you only need to carry several types of plate head bolts and nuts with different lengths to go out and it is not bulky.

Further, according to the wheel structure of the present invention, the nut (and the plate head bolt) which is a replacement part is compared with the conventional clearance changing method in which the entire hand rim welded with a different clearance is newly purchased. ) Only needs to be purchased anew, which significantly reduces the cost of changing clearances.

As described above, the embodiment of the present invention has been described in detail. However, the wheel structure of the wheelchair of the present invention is not limited to the configuration of the above-described embodiment, and various other modified examples are applied. be able to. For example, in the present embodiment, the attachment members of the hand rim are provided at four locations on the ring at equal intervals, but may be provided at three locations or at five or more locations. Further, the shape of the plate head of the plate head bolt, the shape of the outer periphery of the nut, and the like may be changed according to the use conditions, production processes, and the like.

[0016] In addition, in the above-described embodiment, the clearance is determined by the height of the nut 40. As shown in FIG. 4, the plate head bolt 50 in which the screw is cut only halfway is changed in length. It is also possible to prepare several types and change the clearance of the hand rim by exchanging them. In FIG. 4, the same components as those shown in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

[0017]

[Effect of the invention]

 As described in detail above, the wheel structure of the wheelchair according to the present invention is constituted by a plate head bolt and a nut which can be attached and detached and can be replaced with a support rod of the hand rim which has been fixedly attached by welding in the past, and is provided with a hand rim. When changing the clearance, these plate head bolts and nuts are replaced. Therefore, when it is desired to change the clearance after the purchase of the wheelchair, it is possible to provide a wheel structure in which necessary replacement parts are inexpensive and bulky.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of an embodiment of a wheel structure of a wheelchair according to the present invention.

FIG. 2 is an enlarged perspective view showing a part of the configuration of the wheel structure shown in FIG. 1;

3 (a) to 3 (d) are side views showing configurations of nuts having different lengths according to the embodiment, and FIGS. 3 (e) and (f) are plate head bolts having different lengths. It is a side view which shows the structure of.

FIG. 4 is a perspective view showing a configuration of a modified example of the embodiment of the wheel structure of the present invention.

FIG. 5 is an exploded perspective view showing a configuration of a wheel structure of a conventional wheelchair.

[Explanation of symbols]

 10 Main wheel 12,21 Blind nut 1,20 Hand rim 30,50 Plate head bolt 35 Bolt 40 Nut

Claims (5)

[Utility model registration claims] 1. A vehicle comprising: a main wheel; a hand rim; and a hand rim attaching means for attaching the hand rim to the main wheel, wherein a member constituting the hand rim attaching means defines a clearance between the main wheel and the hand rim. The wheel structure of a wheelchair, wherein the member that defines the clearance is a separate member from the main wheel and the hand rim, and is configured to be interchangeable with a member of the same type that defines a different clearance. Construction. 2. The nut, wherein the hand rim mounting means comprises a female screw structure provided on the hand rim, and a bolt screwed into the female screw structure, and a member for defining the clearance is screwed into the bolt. The wheel structure according to claim 1, wherein the clearance is changed by replacing the nut with another nut having a different length. 3. A bolt, wherein said hand rim mounting means has a female screw structure provided on a hand rim, and wherein a member defining said clearance is screwed into said female screw structure, said bolt being another bolt having a different length. Or
The wheel structure according to claim 1, wherein the clearance is changed by replacing the bolt with another bolt having a different screw length. 4. The wheel structure for a wheelchair according to claim 2, wherein the head of the bolt is formed in a plate shape, a hole is provided through the center of the head, and the hand rim mounting means is provided on the rim of the main wheel. The second provided on the inner side
Female screw structure, and a second female screw structure
The wheel structure of a wheelchair, wherein the hand rim is attached to a main wheel by screwing the second bolt to the second female screw structure through the hole. 5. The wheel structure for a wheelchair according to claim 3, wherein the head of the bolt is formed in a plate shape, a hole is provided through the center thereof, and the hand rim attaching means is provided with a rim of the main wheel. The second provided on the inner side
Female screw structure, and a second female screw structure
The wheel structure of a wheelchair, wherein the hand rim is attached to a main wheel by screwing the second bolt to the second female screw structure through the hole.