JPS5830053B2 - wheelchair backstop mechanism - Google Patents

Description

[Detailed Description of the Invention] This invention is designed so that when rolling a wheelchair up a slope, the casters remain facing the direction of travel without applying the brakes, and the casters stop exactly in the same position even in the middle of the slope. It is.

When climbing a slope in a wheelchair, if the slope is long or the obstacles are too large to climb all at once, you will inevitably need to take a break midway.

The way to do this was to apply the brakes or take a break while holding the ring firmly to prevent the wheelchair from backing up.

In the former case, if you don't grip the ring firmly the moment you release the brakes, the wheelchair will back up.

Unless the brakes are operated properly on all culms, the casters will roll in the opposite direction to the direction of travel.

It requires strong grip and muscle strength to correct the movement in the same direction, and if you have to repeat it many times, you will become extremely fatigued.

The same applies to the latter case. This is especially true for people with physical disabilities who have weak grip strength or who have no grip strength, so they create a hole in the ring and press the ring with the palm of their hand when performing. For some people, it is difficult to climb up the slope.

Therefore, a wheelchair with a backstop is needed.

Examples will be described below with reference to the drawings. In FIG. 2, a wheel hub 3 containing a ball bearing 2 is fitted into a hub axle 1 with a ball pusher on one side.

Shrink fit the collar 4 onto the wheel hub 3 and open the spoke holes 5.

A hole 4 is made in the wheel hub 3 and the flange 4f, and a pin 7 inserted in the sliding plate 6f slides in the drilled hole.

A retaining ring 8 is fitted into the pin 7, and a compression coil spring 9 is inserted to keep the retaining ring 8 pressed against the collar 4 at all times.

Insert the thrust bearing 10 and wire cap 11 into the sliding plate 6 in this order.

A cable wire 12 is inserted into the wire cap 11, passed through a hole made in the hub axle 1, and taken out to the inside of the wheelchair.

By doing so, the cable wire 12 is not twisted by the thrust needle bearing 10 even when the sliding plate 6 rotates.

Next, a housing 16 incorporating a one-way clutch 14 and a one-way clutch 15 with a needle bearing is fitted into the wheel hub 3 and the hub axle 1 into which the ball bearing 13 is inserted.

In the housing 16f, make 4 holes into which the pin 7 will fit.
Insert the ball bearing 17.

Then, screw in the hub axle 1f pusher 18.

Insert the hub axle 1 into the hole drilled in the wheelchair frame,
It is fastened with the ball pusher 18 and nut 19.

At this time, the cone 18 and the nut 19 must be adjusted and fastened so that the housing 16 and the wheel hub 3 rotate lightly.

In FIG. 1, a thread is cut on the inner diameter of the carbon steel pipe, a wire cap 20 is screwed in, and the cable wire 12 taken out from the hub axle 1 is inserted.

The cable wire 12 is fixed with a wire holder 22 (this is fixed with bolts and nuts) embedded in a slider 21f that slides inside a steel pipe.

Like the slider 21, the slider 23t slides inside a steel tube.
Connect with.

The elasticity of the coil spring 24 must be greater than the sum of the elasticities of the compression coil springs 9.

A bolt is inserted into the slider 23 through a slotted hole cut in the steel pipe, and the clutch lever 25 is screwed in.

The hole cut into the steel pipe is the clutch lever 25 and the slider 23.
Bend the tip at a right angle so that it stops while being pulled.

Depending on the location, the clutch lever 25 can be installed either by pulling to stop it, pushing it to stop it, or pulling it up to stop it, or select a location that is suitable for each person with a physical disability.

Figure 1 and Figure 2 are combined to form a backstop mechanism for a wheelchair, and at the end of the explanation of the configuration, the one-way clutch 14 on the right side of the wheelchair and the one-way clutch with needle bearing 15 act in the same direction as the left side. It must be incorporated as such.

Next, the functions of this mechanism will be explained in detail.

When the wheelchair does not require a backstop, the retaining ring 8 is always pressed against the collar 4 by the elasticity of the compression coil spring 9, and the pin 7 does not fit into the hole in the housing 16.

Therefore, the wheel hub 3 is supported by the ball bearings 2 and 13 and freely rotates counterclockwise and clockwise.

Next, when the wheelchair goes up a slope, when the clutch lever 25 is operated, the slider 23 slides while pulling the coil spring 24, and the slider 21 also slides.

Then, the sliding plate 6 is pulled by the cable wire 12, and the pin 7 first hits the housing 16 while compressing the compression coil spring 9, and when the wheel hub 3 rotates, it gets stuck in the hole made in the housing 16f, and the pin 7 is connected to the wheel hub 3. The housing 16 is integrated.

Then, the wheel hub 3 is supported by the ball bearings 2 and 17 and rotates.

When the wheel hub 3 rotates counterclockwise, the one-way clutch 14 and the one-way clutch with needle bearing 15 disengage and rotate, but at the moment when the wheel hub 3 attempts to rotate clockwise, the one-way clutch 14, The one-way clutch 15 with a needle bearing engages with the hub axle 1 and does not rotate clockwise.

The wheelchair moves forward but does not back up.

When the clutch lever 25 is removed, the elasticity of the coil spring 24 causes the slider 23 and slider 21 to return to their original positions (the pin 7 is removed from the hole in the housing 16 due to the elasticity of the compression coil spring 9, and the wheel hub 3 returns Becomes free.

This invention was made to allow physically disabled people who use wheelchairs to expand their radius of movement, and it makes it easier to climb uphill, which is one of the obstacles that limit the radius of movement. be.

The effects will be explained below.

Normally, the rear axle of this wheelchair is free and it performs exactly the same functions as a normal wheelchair, but the wheelchair can be equipped with a backstop function only when going up hills.

If the slope is long or the slope is too large to climb all at once, even if you let go of the wheelchair's rings, the casters will remain facing the direction the wheelchair is traveling and will stop exactly in place, allowing you to take a break.

In this condition, it is very easy to start, and you can continue up the slope while taking a break.

There is less fatigue because there is no need to take breaks while operating the brakes or holding the ring tightly.

In particular, the climbing ability of physically disabled people with weak grip strength and those with severe sprains is increased.

[Brief explanation of the drawing]

Fig. 1 is a front view of a part of the clutch lever and a side view taken along line A-, and Fig. 2 is a sectional view of the left wheel hub.

Claims (1)

[Claims] 1. A one-way clutch 14 that engages when the wheel hub 3 is rotated clockwise to move the wheelchair backward, but does not engage when the wheel hub 3 is rotated counterclockwise to move the wheelchair forward; a one-sided clutch 15 with a needle bearing; Fit the housing 16 incorporating the housing 16 into the hub axle 1, cover the housing 16 with the wheel hub 3, and slide the pins T through the holes drilled in the ribs on both sides of the wheel hub 3 to remove the housing 16f. Insert the housing 16 into the hole you drilled, unite the housing 16 and the wheel hub 3 so that the wheel hub 3 will not rotate in the opposite direction in the direction of travel of the wheelchair, and remove the pin 7 from the hole in the housing 16. Separate the housing 16 and wheel hub 3,
A wheelchair backstop mechanism that allows the wheel hub 3 to rotate freely. 2 When the wheel hub 3 has a backstop function, the wheel hub 3 is supported by the ball bearing 17 inserted between the housing 16 and the hub axle 1 and the ball bearing 2 inserted between the wheel hub 3 and the hub axle 1. When the wheel hub 3 rotates freely, the wheel hub 3 is supported by a ball bearing 13 inserted between the wheel hub 3 and the housing 16 and a ball bearing 2 inserted between the wheel hub 3 and the hub axle 1. 2. The backstop mechanism for a wheelchair according to claim 1, wherein the backstop mechanism for a wheelchair rotates while being rotated. 3. By connecting the cable wire 12 and the compression coil spring 9 with the coil spring 24 which has enough force to compress the compression coil spring 9, and maintaining the tensioned state of the coil spring 24, the wheelchair has a backstop function. When the coil spring 24 is not pulled, the force of the compression coil spring 9 returns the pin 1 to its original position.
A backstop mechanism for a wheelchair according to claim 1, characterized in that the wheel hub 3 is rubbed freely in rotation. 4 The slider 23, which slides in a steel tube with the same diameter as the wheelchair frame, and the coil spring 24 are connected to the slider 21. A hole is cut in the steel tube with the tip bent at right angles, and a hole is cut in the steel tube for the slider 23. Screw the clutch lever 25 through the long hole, and insert the cable wire 1 that has passed through the wire cap 20 at the tip of the steel pipe into the slider 21.
3. The backstop mechanism for a wheelchair according to claim 3, wherein: 2 is fastened. 5 Fit the sliding plate 6I on the outside of the wheel hub 3 and the implanted pin 7 of 4 into the hole made in the brim of the wheel hub 3, and attach the compression coil spring 9 to the pin 7.
Insert the retaining ring 8 into the pin 7 when the pin 7 reaches the hole made in the collar of the wheel hub 3, and keep the retaining ring 8 pressed against the collar of the wheel hub 3 by the force of the compression coil spring 9. so that the cable wire 12 passing through the hub axle 1 passes through the center of the sliding plate 6.
4. A backstop mechanism for a wheelchair according to claim 1 or 3, wherein the backstop mechanism is pulled by the wheelchair.