Car seat with auxiliary wheels

Abstract

To provide an auxiliary wheel for a wheelchair which can be easily provided on the wheelchair and enables the wheelchair to safely go over steps. [Solution] An auxiliary wheel for a wheelchair that is attached to a wheelchair wheel and consists of a wheel, an auxiliary wheel drive unit, a base and a pedestal, the wheel is attached to the end of the auxiliary wheel drive shaft that faces the ground, the auxiliary wheel drive unit drives the auxiliary wheel drive shaft left and right parallel to the wheelchair wheel by gear drive, and also drives the auxiliary wheel drive shaft up and down, the base plate and pedestal are approximately rectangular and are fixed with their faces facing each other so that they can be driven up and down, the auxiliary wheel drive unit is provided on the base plate, and a slide hole is provided in the pedestal for driving it up and down, and the wheelchair auxiliary wheel is attached to the pedestal.

Description

[Technical Field]

[0001] The present invention relates to an auxiliary wheel for a wheelchair (hereinafter, the description will be made in terms of a wheelchair). [Background technology]

[0002] Many people now use wheelchairs on a daily basis, with nearly 2 million people in Japan said to use wheelchairs. In recent years, barrier-free access has been implemented, enabling wheelchair users to live convenient and comfortable lives, with progress being made in eliminating steps, installing dedicated ramps, and creating environments that make public transportation more accessible. However, many roads are not well maintained, and even low steps can be very difficult and dangerous for wheelchair users. For these reasons, there is a strong demand for wheelchairs that can safely overcome steps.

[0003] One technology disclosed for stable wheelchair running is one in which a wheelchair is provided with a special frame and training wheels, and the frame tilts in response to the road surface, allowing the front wheels, main wheels, and training wheels to move in accordance with the road surface, thereby enabling stable running on a variety of road surfaces (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2024-05332 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the technology described in Patent Document 1 above has a structure in which training wheels and a frame are already built into the wheelchair, and is not compatible with the wheelchairs currently used by users, so if a user wanted to use such a wheelchair, extensive preparations such as purchasing a new one were required.

[0006] Therefore, a main object of the present invention is to provide an auxiliary wheel for a wheelchair that can be easily attached to a wheelchair and that enables the wheelchair to safely overcome steps. [Means for solving the problem]

[0007] That is, the present invention relates to (1) to (3). (1) An auxiliary wheel attached to a wheelchair wheel, which comprises a wheel, an auxiliary wheel drive unit, a base, and a pedestal, The wheel is attached to the ground side end of the auxiliary wheel drive shaft, The auxiliary wheel drive unit drives the auxiliary wheel drive shaft left and right in parallel with the wheels of the wheelchair by gear drive, and also drives the auxiliary wheel drive shaft up and down; The base plate and the base are substantially rectangular, and are fixed so that their faces face each other and can be driven up and down. An auxiliary wheel drive unit is provided on the base plate, and a slide hole for driving the base plate up and down is provided. Wheelchair auxiliary wheels that are attached to a wheelchair using a base. (2) An auxiliary wheel attached to a wheelchair wheel, the auxiliary wheel drive unit, a base, and a pedestal, The wheel is attached to the ground side end of the auxiliary wheel drive shaft, the auxiliary wheel drive unit is provided on a pendulum mechanism base, and includes a circular leaf spring with a hole at the center of the concentric circle, a gear unit including an auxiliary wheel drive gear, and an auxiliary wheel drive shaft that passes through the hole, and the gear holder is inserted into the other end of the auxiliary wheel drive shaft from the other end of the wheel; an auxiliary wheel drive shaft is passed through a through-hole provided in an upper bearing and a lower bearing provided in the pendulum mechanism base, The base plate and the base are substantially rectangular, and are fixed so that their faces face each other and can be driven up and down. An auxiliary wheel drive unit is provided on the base plate, and a slide hole for driving the base plate up and down is provided. Wheelchair auxiliary wheels that are attached to a wheelchair using a base. (3) An auxiliary wheel attached to a wheelchair wheel, the auxiliary wheel drive unit, a base, and a pedestal, As a method for driving the auxiliary wheel drive shaft up and down, a slide spring is used to connect the base and the pedestal, 2. An auxiliary wheel for a wheelchair as claimed in claim 1, wherein one end of the slide spring is attached to a slide spring attachment hole provided in the base, and the other end of the slide spring is attached to a slide spring attachment hole provided in the pedestal, and the slide spring is capable of moving up and down by connecting the base and the pedestal through the slide spring attachment hole. [Effects of the Invention]

[0008] According to the present invention, auxiliary wheels can be easily attached to a wheelchair, enabling wheelchair users to safely overcome steps even in places where barrier-free access is not fully established. This makes it easier for wheelchair users to go out alone, allowing them to live safely and comfortably. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is a schematic diagram of an auxiliary wheel according to the present embodiment. [Figure 2] FIG. 1 is a diagram showing a state in which the auxiliary wheel of the present embodiment is attached to the wheel of a wheelchair. [Figure 3] 3A and 3B are diagrams illustrating some of the components of the auxiliary wheel of the present embodiment. [Figure 4] 3A and 3B are diagrams illustrating some of the components of the auxiliary wheel of the present embodiment. [Figure 5] 3A and 3B are diagrams illustrating some of the components of the auxiliary wheel of the present embodiment. [Figure 6] FIG. 2 is a diagram showing the auxiliary wheel of the present embodiment in an assembled state. [Figure 7] 1 is a diagram showing a state in which a wheelchair equipped with auxiliary wheels according to the present embodiment climbs a step. FIG. [Figure 8] 1 is a diagram showing a state in which a wheelchair equipped with auxiliary wheels according to the present embodiment climbs a step. FIG. [Figure 9] 1 is a diagram showing a state in which a wheelchair equipped with auxiliary wheels according to the present embodiment climbs a step. FIG. [Figure 10] 1 is a diagram showing an entire wheelchair equipped with auxiliary wheels according to an embodiment of the present invention. [Figure 11]FIG. 10 is a diagram showing some of the components of the auxiliary wheel of the second embodiment. [Figure 12] FIG. 10 is a diagram showing some of the components of the auxiliary wheel of the second embodiment. [Figure 13] FIG. 10 is a diagram showing some of the components of the auxiliary wheel of the second embodiment. [Figure 14] FIG. 10 is a diagram showing the auxiliary wheel of the second embodiment in an assembled state. BEST MODE FOR CARRYING OUT THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows an overall view of an auxiliary wheel 1 of this embodiment, and Fig. 10 shows a schematic diagram of the auxiliary wheel attached to a wheelchair 100. In this embodiment, an example will be described in which the auxiliary wheel 1 is attached to the right front wheel of a wheelchair 100 (an electric wheelchair in this embodiment) (Fig. 10).

[0011] 1, the auxiliary wheel 1 of this embodiment is broadly composed of a wheel 2, a base 3, a wheel drive unit 4, and a base 70. The auxiliary wheel 1 is attached to a wheel of a wheelchair using the base 3 and a pedestal 71, and the wheel 2 is driven by the wheel drive unit 4 to drive the wheel 2 so as to overcome steps.

[0012] In the present embodiment, the auxiliary wheel 1 is attached to the electric wheelchair 100, but the wheelchair to which the auxiliary wheel of this embodiment is attached is not particularly limited, and it can be attached to a normal wheelchair as well as an electric wheelchair. In particular, electric wheelchairs are often used by a single user, and the auxiliary wheel of this embodiment is particularly effective when going over steps in such cases. Also, in this embodiment, the auxiliary wheel 1 is attached to the right front wheel of the wheelchair 100 (the electric wheelchair in this embodiment), but this is not particularly limited, and it can also be attached to the left wheel. Front wheels often have small diameters, making it difficult to go over steps. The auxiliary wheel operates and returns to its original position using only the propulsion force of the wheelchair, and does not require operation by the user. Therefore, it is preferable to attach it to the left or right front wheel.

[0013] FIG. 2 is a diagram showing a state in which the auxiliary wheel 1 of this embodiment is attached to the right front wheel 110 of the wheelchair 100. (a) of FIG. 2 is a side view of the state in which the auxiliary wheel 1 is attached, and (b) is a front view of the state in which the auxiliary wheel 1 is attached. Specific attachment methods include: The right front wheel 110 and the pedestal 71 are fixed by tightening two bolts into the threaded holes provided in the right front wheel 110 and the threaded holes 60 provided in the pedestal 71. After that, the wheel is attached by fastening the pedestal 71 to the pedestal mounting hole 60 of the base 3 and the slide holes 63 provided in the pedestal 71 so that it can slide at four points.

[0014] 3 to 5 show the shapes of the components of the auxiliary wheel 1 used in this embodiment. FIG. 3 shows the components of the base 3 and pedestal 71. The base 3 is a roughly rectangular aluminum plate (iron, stainless steel, titanium, etc. can also be used). The base 3 is a base that drives the left and right pendulum movement of the wheel drive unit 4 using a gear mechanism. Gear drive is achieved by meshing the gear of a rack gear 72, which moves the wheel drive unit 4 left and right, with the gear of an auxiliary wheel drive gear 48 provided on the wheel drive unit 4. The auxiliary wheel drive gear 48 meshes with the rack gear 72 through a gear through-slit 54 provided in the pendulum mechanism base 41 and the back of the pendulum mechanism base 41 (see FIG. 6). The pendulum base pressure plate 73 has the function of inserting 96, which is provided at the bottom of the wheel drive unit 4, from above to prevent the wheel drive unit 4 from jumping forward. The rack gear 72 and pendulum base pressure plate 73 are fixed to the base 3 with bolts and nuts. The bolt insertion hole of the rack gear 72 is cone-shaped, so as not to affect the gear drive. Next, Figure 4 shows an exploded parts diagram of the wheel drive unit 4 and base 3. The individual parts consist of the base 3, rack gear 72, pendulum base pressure plate 73, pendulum mechanism base 41, mounting hole 53 (for mounting to the base 3), gear through slit 54, retraction spring 76, auxiliary wheel drive shaft 42, gear retainer 90, upper bearing 94, lower bearing 95, auxiliary wheel drive gear 48, circular leaf spring 47, and crown gear 49.

[0015] 5 shows an assembly diagram of the wheel drive unit 4 of this embodiment. The assembly diagram on the left shows the wheel drive unit 4 in an assembled state. The exploded view on the right shows the parts of the gear portion and the assembly method. Each part is composed of a retraction spring fixing screw hole 50, a circular leaf spring fixing screw 51, a nut 52, and other parts shown in Figure 4 (items shown in Figure 4 are omitted). The gear part is formed by inserting a circular leaf spring 47 into a cylindrical hole provided inside a crown gear 49. The circular leaf spring 47 and crown gear 49 are then fixed together using a circular leaf spring fixing screw 51 and a nut 52. The circular leaf spring has a rectangular plate portion 56 that protrudes upward. The auxiliary wheel drive gear 48 has a groove portion 57 on its underside (the portion that comes into contact with the circular leaf spring 47) that engages with the rectangular plate portion 56. The gear part is formed by combining the auxiliary wheel drive gear 48 and the crown gear 49 so that the rectangular plate portion 56 and the groove portion 57 engage with each other. The gear unit has a location for attaching a set screw on the side of the cylindrical portion below the crown gear 49, and the set screw is used to fasten the auxiliary wheel drive shaft 42 and the gear unit so that it intersects perpendicularly with the auxiliary wheel drive shaft 42, causing the auxiliary wheel drive shaft 42 to rotate. This structure locks the auxiliary wheel drive shaft 42, preventing it from rotating in the opposite direction. The circular leaf spring 47, auxiliary wheel drive gear 48, and crown gear 49 are all circular, and each has a hole in the center through which the auxiliary wheel drive shaft 42 passes. The auxiliary wheel drive shaft 42 passes through the gear unit to form part of the auxiliary wheel drive unit 4. The auxiliary wheel drive shaft 42 is rod-shaped, with one end bent approximately 90 degrees in an L-shape, and the horizontally extending portion doubles as the wheel axle.

[0016] An assembly diagram of the wheel drive unit 4 shown in Figure 5 will be described. The wheel drive unit 4 is configured by providing a gear unit and an auxiliary wheel drive shaft 42 on a pendulum mechanism base 41. The pendulum mechanism base 41 is roughly cuboid in shape, is hollow, and does not have a front face (the side other than the side where the auxiliary wheel 1 is attached), and has holes on the top and bottom faces through which the auxiliary wheel drive shaft 42 passes, so that the holes are roughly parallel to the pendulum mechanism base 41. An upper bearing 94 and a lower bearing 95 are provided on the top and bottom of the pendulum mechanism base 41 (both of which have a through-hole in the center in the horizontal axis direction through which the auxiliary wheel drive shaft 42 passes), and the auxiliary wheel drive shaft 42 is fixed in place. The assembly method is to insert the auxiliary wheel drive shaft 42 tip-first through the hole formed in the lower bearing 95, and then, in order from the tip of the auxiliary wheel drive shaft 42 downward, pass the gear portion and gear retainer 90 through the top of the auxiliary wheel drive shaft 42, and finally pass the upper end of the auxiliary wheel drive shaft 42 through the hole formed in the upper bearing 94. Note that the length of the gear retainer 90 is adjusted by machining it to be approximately equal to the length from the top surface of the auxiliary wheel drive gear 48 to the lower surface of the upper bearing 94. As a result, the gear retainer 90 of the gear portion is held down from above by the upper bearing 94, and the circular leaf spring 47 prevents the auxiliary wheel drive gear 48 from floating up.

[0017] Figure 6 shows an assembly diagram of the wheel drive unit 4, and an assembly diagram of the rotation spring unit 47, rotation stopper unit 48, and drive bearing unit 49. The method for attaching the auxiliary wheel has been explained in Figure 2, so it will be omitted here. First, the attachment to the wheelchair 100 (right wheel 110) will be explained using a front view of the auxiliary wheel 1. The auxiliary wheel drive unit 4 is attached to the auxiliary wheel drive unit attachment hole 61 of the base 3 by passing a bolt through the attachment hole 53. The part bolted to the attachment hole 53 becomes the fulcrum when the wheel drive unit 4 moves along the pendulum orbit. A bolt is passed through the return spring fixing hole 50 provided on the front side of the base 3, and one end of the return spring 76 is fixed to the back side of the base 3 with a nut (in this embodiment, the tip is hemispherical, but this is not limited to this). At this time, the spring is fixed so that it tightly meshes with the auxiliary wheel drive gear 48 and the rack gear 72 provided on the base 3. Next, a method for connecting the base 3 with the auxiliary wheel drive unit 4 attached to the pedestal 4 will be described. The base 3 and the pedestal 4 are overlapped so that the auxiliary wheel drive unit attachment hole provided in the base 3 and the slide hole provided in the pedestal 4 overlap, and then the base 3 and the pedestal 4 are fixed at four points with bolts and nuts. At this time, one end of the upper part of the slide spring 77 as viewed in the drawing is attached to the slide spring attachment hole 65 of the pedestal 4 with a bolt and nut, the slide spring 77 is positioned so that it fits into the slide spring storage hole 64, and the other end of the slide spring 77 is attached to the back side of the base 3 through the slide spring attachment hole 65 of the base with a bolt and nut. By adopting such a structure, even if the base 3 is pulled downward (towards the road), it can be driven to return to its original position when the load is removed.

[0018] 7 to 9 show simplified auxiliary wheel diagrams of a wheelchair 100 fitted with auxiliary wheels 1 of this embodiment going over (climbing) a step. The wheelchair goes over a step 10 in the following order from (a) on the left in Fig. 7, (b) → (c), (a) → (b) → (c) in Fig. 8, and (a) → (b) → (c) in Fig. 9. Figure 7(a) shows the wheelchair approaching a step, Figure 7(b) shows the state in which the auxiliary wheel drive shaft 42 is extended by the wheel contacting the side of the step and rotating, and Figure 7(c) shows the state just before the wheelchair tire goes over a low step equal to the height (diameter) of the wheel. Figure 8(a) shows the state in which the auxiliary wheel drive shaft 42 is extended just before the wheelchair finishes going over the step, Figure 8(b) shows the state in which the auxiliary wheel drive shaft 42 has returned firmly to its original position when the wheelchair has finished going over the step, and Figure 8(c) shows the state in which wheel 2 has begun to return to its original position (in front of the wheelchair tire) by the drive mechanism of auxiliary wheel 1. Figures 9(a) and 9(b) continue to show the process in which wheel 2 returns to its original position (in front of the wheelchair tire), and Figure 9(c) shows the state in which wheel 2 has completely returned to its original position (in front of the wheelchair tire).

[0019] FIG. 10 shows the entire state in which the auxiliary wheel 1 of this embodiment is attached to the wheelchair 100.

[0020] Finally, the drive mechanism will be explained. First, the wheelchair moves with the auxiliary wheels 1 assembled as shown in FIG. 1 or FIG. 7(a). Compared to a wheelchair, they are very compact and do not get in the way of movement (FIG. 10). When approaching a step and starting to go over it, the auxiliary wheels 1 start to drive. At this time, a step (smaller than the road step) with a height equal to the width (diameter) of the wheels 2 is formed, and the front wheels of the wheelchair 100 ride over the step of the auxiliary wheels 2, and then ride over the road step (the step that has been lowered as a result), making it easier to pass over the step (FIGS. 7(b) to 9(a)). The movement of the auxiliary wheels 1 of this embodiment at this time will be explained. When going over a step, the wheels 2 need to go over it, and at that time the wheels 2 need to extend in the axial direction of the auxiliary wheel drive shaft 42 compared to their original position. The aforementioned auxiliary wheel 1 is driven by a slide spring 77 (the other end of which is fixed to the base 3) provided on a pedestal 71 fixed to the wheel of the wheelchair, which slides the base 3 from the top to the bottom of the slide hole 63, and moves so as to extend in the axial direction of the auxiliary wheel drive shaft 42. Driving the auxiliary wheel 1 in this way makes it possible to get over steps.

[0021] Next, after going over the step, the wheel 2 is moved to the front of the wheelchair wheel, which is the original position from when it moved to the rear of the wheel of the wheelchair 100, and is driven to return to the normal running state (Fig. 1, Fig. 9(c)). At this time, the auxiliary wheel 1 is driven in a pendulum manner by the auxiliary wheel drive unit 4, so that the wheel 2 returns to the front. Until the wheel 2 gets on top of the step and goes over it, the rear pendulum drive moves the wheel 2 rearward by moving it to the rear of the wheelchair while meshing with the rack gear (fan-shaped arc-shaped part) provided on the base 3 and the auxiliary wheel drive gear 48 of the auxiliary wheel drive unit 4. At this time, the auxiliary wheel drive unit 4 moves from the front to the rear of the wheelchair 100 while performing a pendulum drive (Fig. 7(a) to Fig. 8(b)). After getting on top of the step, the wheel 2 is moved forward, The auxiliary wheel 1 is driven to move forward. At this time, the auxiliary wheel drive unit 4 that has moved backward cannot move by itself, so it needs to be driven to move forward. To achieve this, drive by a return spring 76 provided on the base 3 and the auxiliary wheel drive unit 4 is used (Fig. 1). Before going over the step, the return spring is in a free state with no load applied, but after going over the step by the above-mentioned drive, when the auxiliary wheel drive unit 4 moves backward, the return spring 76 is in an extended state and a load is applied. Therefore, using the force of this load spring, the rack gear 72 and the auxiliary wheel drive gear 48 mesh together to perform gear drive, and the auxiliary wheel drive unit 4 is driven to move forward by pendulum drive.

[0022] However, because the wheel 2 extends toward the inside of the wheelchair, it cannot return forward using normal spring drive alone. The auxiliary wheel 1 of this embodiment solves this problem by rotating the wheel 2 that has moved rearward 360 degrees toward the outside of the wheelchair and returning it to the front. When the wheel 2 moves rearward, the retraction spring 76 is in an extended state, so the spring's return force is used to move the auxiliary wheel drive unit 4 and wheel 2 forward, as described above. The drive at this time is achieved by the rack gear 72 and the auxiliary wheel drive gear 48, which are now meshed together and driven forward by gear drive. Because the gear configuration is such that the auxiliary wheel drive gear 48, which is a gear, rotates, rotation of the auxiliary wheel drive gear 48 rotates the crown gear 49 and simultaneously rotates the auxiliary wheel drive shaft 42 (clockwise in this embodiment), allowing the wheel 2 to rotate approximately 360 degrees. By the drive described above, it is possible to return to the front of the wheels of the wheelchair 100 by rotating while returning to the front of the wheels. In order to achieve this type of drive, it is necessary to provide a reverse rotation prevention mechanism for the gear section as described above so that the auxiliary wheel drive shaft 42 and the wheel 2 do not rotate when the auxiliary wheel drive section 4 and the wheel 2 move forward of the wheelchair. Additionally, a structure is required to prevent the auxiliary wheel drive unit 4 from floating up when it moves back and forth due to the pendulum drive. This structure is the pendulum base pressure plate 73 provided on the base 3 and the lower end convex portion 96 of the pendulum mechanism base provided on the pendulum mechanism base 41. The lower end protrusion 96 of the pendulum mechanism base is inserted into the gap between the base 3 and the pendulum base pressure plate 73, and is structured to hold down the auxiliary wheel drive unit 4 so that it does not float up.

[0023] As a second embodiment, an auxiliary wheel 1 in which a spring is provided on the auxiliary wheel drive shaft 42 is shown in Figures 11-14. The basic configuration is the same as the auxiliary wheel 1 of the above-mentioned embodiment, but there are some differences, which will be explained below. Since the basic configuration is the same, only the differences will be described using the drawings. The major difference is the configuration related to the vertical movement of the auxiliary wheel drive shaft 42. <Differences> The auxiliary wheel 1 of the second embodiment is provided with a slide spring on the auxiliary wheel drive shaft 42 as a mechanism for vertical movement when going over steps. (See the assembled completed drawings of Figures 5 and 6, and the assembled completed vehicle drawings of Figures 13 and 14.) The auxiliary wheel 1 in the first embodiment is fixed to the base 3 and the seat 4 when attached to the wheel of the wheelchair 100, but the auxiliary wheel 1 in the second embodiment is attached only to the base 3. In the auxiliary wheel 1 of the first embodiment, the drive shaft and wheel shaft are integrated by the auxiliary wheel drive shaft 42, but in the auxiliary wheel 1 of the second embodiment, a wheel shaft 98 is provided as a separate part. (See installation diagrams 3 and 4 in Figure 6 and installation diagram 3 in Figure 14.)

[0024] The second embodiment has been described above, but the auxiliary wheel 1 of the second embodiment is superior in strength to the auxiliary wheel 1 of the first embodiment. In this respect, when the durability of the auxiliary wheel drive shaft 42 for overcoming steps is taken into consideration, the auxiliary wheel 1 of the first embodiment has a more preferable shape. In addition, since the auxiliary wheel 1 shown here is a structure for a right-side wheel, a symmetrical auxiliary wheel 1 is required for a left-side wheel.

[0025] The auxiliary wheel 1 shown in the figure has a structure for a right-side wheel, so a symmetrical auxiliary wheel 1 is required for the left-side wheel. The structure is completely unchanged, and an identical symmetrical one is used for the left side. The gears used here are the auxiliary wheel drive gear 48 with 38T, and the rack gear 72 with more than 38T. There is no particular limit to the number of gears, and there is no problem in changing the shape of the auxiliary wheel 1 as needed to suit the shape of the wheelchair, etc. [Explanation of symbols]

[0026] 1 Auxiliary wheel 2 wheels 3. Foundation 4 Auxiliary wheel drive unit 10 steps 41 Pendulum mechanism base 42 Auxiliary wheel drive shaft 47 Circular leaf spring 48 Auxiliary wheel drive gear 49 Crown Gear 50 Retraction spring fixing hole 51 Circular leaf spring fixing screw 52 Nut 53 Mounting holes 54 Gear through slit 60 Base mounting hole 61 Auxiliary wheel drive unit mounting hole 62 Wheelchair wheel mounting hole 63 Slide hole 64 Slide spring storage hole 65 Slide spring mounting hole 71 Pedestal 72 Rack Gear 73 Pendulum base pressure plate 76 Retraction spring 77 Slide spring 90 Gear holder 94 Upper bearing 95 Lower bearing 96 Lower end convex part of pendulum mechanism base 97 Retractable spring mounting pipe 98 Wheel axle 100 wheelchairs 110 Front wheel

Claims

1. Wheels and an auxiliary wheel drive unit; The base and pedestal, An auxiliary wheel attached to a wheel of a wheelchair, comprising: The auxiliary wheel is attached to an end of the auxiliary wheel drive shaft on the ground side, The auxiliary wheel drive unit drives the auxiliary wheel drive shaft left and right in parallel with the wheels of the wheelchair by gear drive, and also drives the auxiliary wheel drive shaft up and down; The base and the seat are substantially rectangular, and are fixed so that their faces face each other and can be driven up and down. An auxiliary wheel drive unit is provided on the base, and a slide hole is provided in the pedestal for driving the base up and down. Wheelchair auxiliary wheels that are attached to a wheelchair using a base.

2. Wheels and an auxiliary wheel drive unit; The base and pedestal, An auxiliary wheel attached to a wheel of a wheelchair, comprising: The auxiliary wheel is attached to an end of the auxiliary wheel drive shaft on the ground side, The auxiliary wheel drive unit is provided on a pendulum mechanism base, and includes a circular leaf spring with a hole at the center of the concentric circle, a gear unit including an auxiliary wheel drive gear, and an auxiliary wheel drive shaft that passes through the hole, and a gear holder that is inserted into the other end of the auxiliary wheel drive shaft from the other end of the wheel; a bolt is passed through an attachment hole provided at one end of the pendulum mechanism base and attached to an auxiliary wheel drive unit attachment hole provided at the base, thereby forming a pendulum mechanism with the attachment hole as a fulcrum; an auxiliary wheel drive shaft is passed through a through-hole provided in an upper bearing and a lower bearing provided in the pendulum mechanism base, The base and the seat are substantially rectangular, and are fixed so that their faces face each other and can be driven up and down. An auxiliary wheel drive unit is provided on the base, and a slide hole is provided in the pedestal for driving the base up and down. Wheelchair auxiliary wheels that are attached to a wheelchair using a base.

3. Wheels and an auxiliary wheel drive unit; The base and pedestal, An auxiliary wheel attached to a wheel of a wheelchair, comprising: As a method for driving the auxiliary wheel drive shaft up and down, a slide spring is used to connect the base and the pedestal, 2. An auxiliary wheel for a wheelchair according to claim 1, wherein one end of the slide spring is attached to a slide spring attachment hole provided in the base, and the other end of the slide spring is attached to a slide spring attachment hole provided in the pedestal, and the slide spring is capable of moving up and down by connecting the base and the pedestal through the slide spring attachment hole.

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