JPH11309178A - Wheelchair for leg handicapped person capable of ascending/descending step - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily ascend or descend the step of a street by arranging wire pulleys on frames of a footrest section and a wheel support, fitting auxiliary wheels to protruded shanks, and connecting the worm reduction gears arranged on the right and left armrest sections and the wire pulleys with ropes. SOLUTION: Circular wire rope pulleys 2 are arranged on the lower frame of a footrest section 1, shakes are protruded in the front of them, and front auxiliary wheels 3 are fitted at the tips. Circular wire pulleys 6 are arranged on the support frame 5 of rear wheels 4, shanks are protruded in the rear of them, and rear auxiliary wheels 7 are fitted at the tips. One end of a rope fixed with the other end to the groove of the shank of the right wire pulley 2 is wound on the wire drum 10 of a right reduction gear 9 through the lower side of the wire pulley 2. One end of a rope fixed with the other end to the groove of the shank of the left wire pulley 6 is wound on the wire drum 10 of a left reduction gear 9 through the lower side of the wire pulley 6. The front auxiliary wheels 3 and the rear auxiliary wheels 7 can be vertically moved freely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention hits a step so that a disabled person who has difficulty with legs but has good hands and arms can go out and carry out social activities without a caregiver and enjoy the outside world. The present invention relates to a structure of a wheelchair in which it can be moved up and down.

[0002]

BACKGROUND OF THE INVENTION Recently, the number of wheelchairs has greatly increased, and it has been occasionally seen that elderly and sick persons and disabled persons with leg disabilities go down the street in wheelchairs pushed by caregivers. However, as seen in wheelchair marathon competitions and summer / winter Paralympic competitions, many people with disabilities have more physical strength than ordinary people in wheelchairs. The number of these people is just the tip of the iceberg, and there is likely to be a great many socially disabled people behind them. One of the obstacles to these people's social activities is that there are steps on streets that cannot be moved up and down with conventional wheelchairs.
The steps on this street are being remodeled one after another, but it will probably be far away from the street. Therefore, in the present state, going out alone by a disabled person is equivalent to violence, and the appearance of a wheelchair capable of moving up and down steps quickly is desired.

[0003]

SUMMARY OF THE INVENTION The present invention aims to raise or lower a step on a street so that a disabled person with only a limited leg can go out alone in a wheelchair for social activities or distractions. It is an object of the present invention to provide a structure of a wheelchair capable of being operated.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a conventional wheelchair, ie, a seat, a backrest, an armrest, a footrest, and a rear wheel supported by two caster front wheels and two rear wheels with rubber tires. In the wheelchair including the support portion, a fan-shaped or circular wire pulley having a center near the lower end of the frame below the footrest portion is provided on the front side, and a handle is protruded forward from the pulley, and a front auxiliary wheel is attached to the front end. On the rear side, a fan-shaped or circular wire pulley centered on the lower extension of the wheel support frame or the front and rear thereof is provided, a handle is protruded rearward, and a rear auxiliary wheel is mounted on the rear end.

[0005] Two worm reducers are mounted on the armrests of the seat in front and back with the worm shaft facing upward, and a wire drum is fixed on the wheel shaft. The wire rope fixed to the groove of the pulley is wound around the wire drum of each reduction gear through the lower edge of the wire pulley, and the crank handle is attached to each worm shaft.

However, since it is difficult to operate the four handles, it is necessary to connect the shafts of the front and rear auxiliary wheels to each other and fix them to the handle of each auxiliary wheel so as to have rigidity on the left and right sides, and to ignore some bending. Therefore, only one reduction gear is used for each of the front and rear wires, and therefore only two reduction gears are used. It is appropriate that the normal position of each auxiliary wheel during traveling is about 10 cm above the ground for both the front auxiliary wheel and the rear auxiliary wheel. The wire pulley incorporates a spring having a strength to raise the auxiliary wheel by about 60 degrees from a predetermined position in order to always maintain the tension of the wire rope.

Further, a rear auxiliary wheel is provided with a rotation function as an auxiliary moving device while the rear wheel is floating in the air. Considering that the moving distance is about 100 cm even if some extra space is added, a small wire drum with a diameter of about 7 to 8 cm is attached to the rear auxiliary wheel, and a wire rope of about 3 mm is wound around 5 to 6 times,
The end passes through the lower edge of the wire pulley of the rear auxiliary wheel, and is wound by a small wire drum winder with a crank handle attached to the lower front end of the armrest. Therefore, when the rider turns the steering wheel, the rear auxiliary wheel rotates,
The wheelchair moves forward when it lands. The wire drum for rotating the rear auxiliary wheel also has a built-in spring that winds up if the wire is loosened. In addition, two rear wheel brakes are arranged in one place so that the left and right wheels can be braked with one hand, and a parking brake is also necessary in consideration of a step on an inclined ground.

[0008]

[Function] When climbing up a step in a wheelchair, you must approach the step as much as possible, but people with leg disabilities may not be able to retract their feet. First, raise the front auxiliary wheel above the upper ground. Stop the wheelchair as close as possible without touching the steps. Next, by turning the handle of the reduction gear of the front auxiliary wheel, pulling the wire rope and pressing the front auxiliary wheel against the upper ground, the front wheel caster is lifted around the rear wheel axle and the passenger leans backward, but the rear The auxiliary wheels protrude rearward so that they do not fall backward.

The front auxiliary wheel is pressed against the ground while raising the rear auxiliary wheel until the front wheel caster reaches the level of the upper ground. The rear auxiliary wheel is raised because the rear auxiliary wheel prevents rear rotation of the wheelchair. When the front wheel casters reach the level of the upper ground, the rear wheels remain on the lower stage, so the rear wheels can be advanced by the hand rim until they hit the step. Since the front wheel casters land on the upper ground by the forward movement, the front auxiliary wheels are raised so as not to hinder the lifting operation of the rear wheels.

Next, when lifting the rear wheels, the handle of the rear auxiliary wheel up / down reduction gear is rotated to push down the lower ground with the rear auxiliary wheels until the rear wheels reach the height of the upper ground. Even if the height of the upper ground is reached, the rear wheel can not move forward while suspended in the air, so rotate the handle of the winding machine at the lower part of the armrest and pull the rear auxiliary wheel rotating wire rope until the rear wheel rides on the upper ground . If the rear wheel lands on the upper ground and raises the rear auxiliary wheel, the wheelchair can move freely.
And the rear auxiliary wheel is 10cm so as not to hinder the running.
Raise to about.

When descending on a step, the front wheel approaches the step to the extent that the front wheel does not fall off the step, and lowers the front auxiliary wheel until it temporarily presses the lower ground. If it does not reach, this step is impossible to get down unless you have the skill and the help of a cane. After confirming that the front auxiliary wheel supports the weight of the front part of the vehicle, move forward with the rear wheel, suspend the front wheel in the air, then wind up the front auxiliary wheel and lower the front wheel by about 10 cm. Stop winding.

The reason for this is that the downward curve of the front wheel enters the lower side of the center of the rear wheel, and if the curve is further lowered, the front inclination angle suddenly increases and the vehicle may fall forward. In addition, 10c
The descending distance m varies depending on the distance between the front wheel and the rear wheel of the wheelchair. At this point, lower the rear auxiliary wheel to almost the upper ground,
Move the body forward with the hand rim, apply the rear wheel down from the step while applying the brake, apply the rear weight to the rear auxiliary wheel, then loosen the rope of the rear auxiliary wheel and lower the rear wheel at a stroke to the lower stage before the front wheel, Next, the front auxiliary wheel is wound up, and the front wheel is landed on the lower ground.

[0013]

FIG. 1 is a side view of a wheelchair according to an embodiment of the present invention. The wheelchair of the present invention is basically a conventional one, with some processing and several parts attached. At the front part, the casters are mounted inside the frame, and a circular wire rope pulley 2 having a center in the lower frame of the footrest part 1 is provided outside the frame, from which the handle is projected forward and a front auxiliary wheel 3 is provided at the tip. Attach. In the rear part, a circular wire pulley 6 is provided at a lower extension of the support frame 5 of the rear wheel 4, from which a handle is protruded rearward, and a rear auxiliary wheel 7 is mounted at the tip. The front auxiliary wheel 3 and the rear auxiliary wheel 7 are penetrated by one shaft on each of left and right sides to strengthen the vehicle body, and both ends are fixed by welding to their respective handles.

At the front ends of the left and right armrests 8, one reduction gear 9 is installed with the worm shaft facing upward and a wire drum 10 attached to the wheel shaft. The other end of the wire rope, one end of which is fixed to the groove near the handle, is wound around the wire drum 10 of the right reduction gear 9 via the lower side of the wire pulley 2, and the left rear auxiliary wheel 7 Connect the other end of the wire rope, one end of which is fixed to the groove near the handle of the wire pulley 6, to the wire pulley 6
Is wound around the wire drum 10 of the left reduction gear 9 via the lower side. The space-saving crank handle 11 is fitted into the worm shaft of each speed reducer 9. The front and rear wire pulleys incorporate springs to maintain the tension of the wire rope at all times. In this state, the front auxiliary wheel 3 and the rear auxiliary wheel 7 can freely move up and down.

Further, since the propulsion ability is lost when the rear wheel is floating, the rear auxiliary wheel 7 is provided with a rotation function as a temporary propulsion device. The moving distance is about 100 cm, and the rear auxiliary wheel 7 has a wire drum 1 having a diameter of 7 to 8 cm.
Attach 2 and wind it 5-6 times in the forward direction by pulling a rope of about 3 mm, and its end passes under the wire pulley 6 of the rear auxiliary wheel 7 and is provided with a small wire with a crank handle provided below the armrest. The drum is wound by a winder 13. The wire drum 12 also incorporates a rope tension spring. Therefore, if the rider rotates the wind-up device 13, the rider can move forward even if the rear wheel is floating in the air. Two rear brakes 14 are arranged in one place so that the left and right wheels can be braked with one hand, and a conventional parking brake is necessary in consideration of a step on an inclined ground.

FIG. 2 is a front view. The front wheel casters 15 are fixed inside the support frame of the footrest 1, and the wire pulleys 2 are provided outside. Since both ends of the shaft of the front auxiliary wheel 3 are fixed to the handle of the pulley 2 and do not rotate, when the front auxiliary wheel 3 is landing so as not to trip, taking into consideration the getting on and off of a passenger with bad legs. The axis is also curved so that the center part touches the ground. The handle on the left side without the pulley is also mounted so as to be rotatable at a position symmetrical to the right side with the pulley.

FIG. 3 is a rear view. Since the pulley of the front auxiliary wheel 3 is provided on the right side of the vehicle body, the wire pulley 6 of the rear auxiliary wheel 7 is provided on the left side. In the case of the rear auxiliary wheel 7, the pulley 6 is mounted inside the support frame of the rear wheel. The shaft connecting the left and right rear auxiliary wheels 7 may be a straight line, but when the caregiver pushes the hand, the shaft is raised to about the height of the rear wheel and hooked on the hook so that the caregiver's leg does not hit. In this case, the wire of the left reduction gear 9 is loosened, but a built-in spring is designed so that the wire drum 12 of the rear auxiliary wheel 7 winds up the entire length.

FIG. 4 is a state diagram in which only the front wheels have landed on the upper stage, and shows that the rear auxiliary wheels 7 prevent the vehicle from falling backward.

[Brief description of the drawings]

FIG. 1 is a side view of a wheelchair.

FIG. 2 is a front view of a wheelchair.

FIG. 3 is a rear view of a wheelchair.

FIG. 4 is a view showing a state where a front wheel lands on an upper stage;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 footrest portion 2 front wheel wire pulley 3 front auxiliary wheel 4 rear wheel 5 rear wheel support frame 6 rear wheel wire pulley 7 rear auxiliary wheel 8 armrest 9 reduction gear 10 reduction gear wire drum 11 reduction gear crank handle 12 rear auxiliary wheel wire Drum 13 Winder 14 Brake 15 Front wheel caster

[Procedure amendment]

[Submission date] June 27, 1998

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Claims (1)

[Claims] The frame is supported by front wheels of two casters and two rear wheels, and a frame is provided by members supporting the casters, a footrest, an armrest, a seat, a backrest, and a rear wheel support. In the conventional wheelchair that is formed, a fan-shaped or circular wire pulley having a center near the lower end of the frame below the footrest is provided on the front side, a handle is put forward from this, a front auxiliary wheel is attached to the front end, and on the rear side. Is provided with a fan-shaped or circular wire pulley having a center at the lower extension of the rear wheel support frame or at the front and rear thereof, a handle is provided behind this, a rear auxiliary wheel is attached to the rear end, and a wire pulley for the front and rear auxiliary wheels is provided. Attach one end of the wire rope to the groove of, and install a total of two reducers on the left and right armrest frames with the worm input shaft facing upward, attach the wire drum to the worm wheel, Wrap the other end of the wire rope in the groove of the pulley through the lower edge of the wire pulley onto the wire drum of the worm wheel, attach a crank handle to each worm input shaft, and attach a small wire drum coaxially to the rear auxiliary wheel and pull. 5-6 wire rope in forward direction
Winding, the other end passes through the lower edge of the wire pulley of the rear auxiliary wheel and winds up on the winder of the frame below the armrest, and each wire pulley and small wire drum have a step with a rope tension spring attached. Wheelchair for people with disabilities who can move up and down