JPH0335300Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" The present invention relates to an improvement of a folding wheelchair.

``Prior Art'' Conventionally used foldable wheelchairs consist of a pair of rotatably supported base parts with an axle attached and an upper part forming a seat, with their middle parts intersecting each other. The wheelchair was supported by supporting legs, and the width of the wheelchair was changed by opening and closing the supporting legs around the intersection of the supporting legs.

Therefore, when a disabled person using a wheelchair himself or herself folds or unfolds the wheelchair, there is no mechanism that can assist the user in opening and closing the legs.

``Problems to be Solved by the Invention'' When opening and closing the legs of a wheelchair, it is difficult to operate the wheelchair because it is done in an unnatural posture, and it is extremely difficult for a person with a disability to open and close the legs himself.

Furthermore, providing an auxiliary mechanism to open and close the wheels of a wheelchair causes problems such as the device becomes complicated and very expensive, and also increases in weight and becomes difficult to operate.

``Means for Solving the Problems'' Therefore, as a means for solving the above-mentioned problems, the present invention has been developed to connect the lower ends of a pair of cross-support legs, each of which is rotatably pivoted at its intermediate portion, to a wheel. A pair of seat rods each having a flexible seat portion attached thereto, and a pair of upright rods each having a similarly flexible backrest portion pivotably attached to the lower part of each base frame. The upper ends of the cross support legs are pivotally attached to both the front and rear ends of the seat rod of the upper body formed by fixing the upper body, and a tension spring is installed between the upper and lower ends of one of the cross support legs, respectively. It is formed by attaching one end of a cable connected to a locking ring that is vertically movably attached to the intersection of the cross support legs and attached to the upper part of one of the upright rods.

``Operation'' When the seat of the upper body is lifted upward, the weight of the base frame pulls both ends of the cross-supporting legs in the vertical direction against the tension force of the tension spring, narrowing the width and causing the cross-support legs to become narrower. The engaged locking ring can move downward under its own weight to prevent the cross-supporting legs from opening.

In addition, when the handle piece attached to the back of the upright rod of the upper body is pulled and the locking ring connected to the wire cable is pulled up, the cross-supporting leg, which was prevented from opening by the locking ring, is pulled up. The legs are opened by the action of a spring.

``Example'' Hereinafter, the present invention will be explained with reference to drawings of an example.A pair of base frames 1 formed in a substantially rectangular shape have wheels 2 with handle rings 3 attached on both sides rotatably supported, and a long plate The lower ends of a pair of cross supporting legs 5 and 6 which intersect at an intermediate portion and are rotatably pivoted at the intersecting portion on a shaft 7 are attached to locking ribs 8 protruding from both front and rear ends of the lower inner side of the base frame 1. , 8', respectively, and the upper ends of the cross-support legs 5, 6 are connected to the seat rods 12, 12 of the upper body 10.
It is pivotally connected to locking ribs 15, 15 protruding from both front and rear ends of the inner side.

This upper body 10 has a pair of seat rods 12, 12 on which a flexible seat 11 made of cloth or synthetic resin material is attached substantially horizontally, and a back support 13 that is also flexible is attached to the rear ends of the pair of seat rods 12, 12. A pair of standing rods 14, 14
It is formed by being integrally fixed to the.

A pair of tension springs 16 are connected to both ends of one of the cross support legs 6 in the vertical direction, respectively, to provide a tensile force so as to draw the cross support legs 6 toward each other. 1
Reference numeral 8 denotes a locking ring which is inserted through the intersection of the cross-support legs 6 and attached so as to be movable in the vertical direction between the cross-support legs.
By connecting the other end of the wire cable 20 connected to the handle piece 19 located on the back side of the cross support leg 6 and pulling the handle piece 19, the locking ring 8 located below the cross support leg 6 is moved in the direction of the intermediate axis 7. It can be pulled up.

Further, the downward movement of the locking ring 18 is caused by falling due to its own weight when the cross-supporting leg 6 is closed, and is locked due to the frictional resistance between the cross-supporting leg and the locking ring 18 below the cross-supporting leg. This prevents the cross support legs 6 from opening. This downward movement of the locking ring 18 causes it to fall due to its own weight, but if necessary, the return spring 22
is attached between the locking ring 18 and the base frame 1, and the locking ring can be forcibly pulled and moved. 25
are armrests raised on both sides of the upper body 10.

Below, to explain the effects of the embodiment, the second
As shown, a locking ring 18 is inserted into the outside of the cross-support legs 6, and the cross-support legs are pulled outwardly from each other by tension springs 16, and the upper body 10 is seated on the upper body 10, which is pivoted to the upper end of the cross-support legs 6. The rod 12 is engaged with the upper frame part 1a of the base frame 1 to fix the vehicle width to a constant width, and the weight of a disabled person sitting on the seat part 11 is supported by the upper frame part 1a.

When closing the cross support legs 5 and 6, as shown in FIG.
The base frame 1 with the wheels 2 is pulled toward each other by its own weight against the tension spring 16, and the tension spring 16 is stretched in the vertical direction against the tension force, so that the base frame 1 with the wheels 2 1 can be drawn together to close the cross-support legs 5, 6.

When the cross support legs 5 and 6 close, the locking ring 18 hooked to the shaft 7 of one of the cross support legs 6 falls downward due to its own weight, and the cross support legs 6 are narrowed together. The lower part of is clamped and locked by the locking ring 18. In this case, the locking ring 18 will not slide upward due to frictional resistance.

By clamping the lower part of the cross support leg 6 with this locking ring 18, the seat part 1 was lifted upward.
Even if you release your hand from 1, the cross support legs 6 will not open in the left-right direction.

This downward movement of the locking ring 18 is due to its own weight, but by installing a return spring 22 between the locking ring 18 and the base frame 1, the movement can be ensured when the cross support legs 6 are closed. It can be held in place. That is, when the cross support leg 6 is closed, even if the frictional resistance between the locking ring 18 and the cross support leg 6 is lost due to an impact when the wheelchair falls or a shock during transportation, the return spring 22 acts. Since the locking ring 18 does not move in the direction of the axis 7 of the cross support leg 6, the wheelchair can be transported safely.

When opening the cross support leg 6 which has been closed once, it can be connected to one end of the cable 20 by simply pulling the handle piece 19 attached to the back of the upright rod 14 of the upper body 10, as shown in FIG. At the same time as pulling up the locking ring 18 in the direction of the axis 7 of the cross support leg 6,
The cross support legs 6 held by the locking rings are opened in the left and right direction by the tensile force of the tension spring 16, and the upper body 10 is lowered to the upper frame portion 1a of the base frame 1.
It is locked and fixed to.

``Effect of the invention'' By lifting the seat, the tension spring can be stretched by the base frame's own weight, and both wheels can be drawn together.When the cross-supporting legs become narrow, the locking ring is automatically moved by the weight of the base frame. It can hold the cross-support legs that have fallen and closed, and by pulling the locking ring upwards, the wheels can be automatically spread out by the tension of the tension springs, allowing the wheelchair to be used as a wheelchair. The simple structure prevents an increase in weight, making it convenient to carry, and has the advantage of being extremely easy to handle.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a side view of the wheelchair of the invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a cross-supporting leg with the legs closed. FIG. 4 is a sectional view of the state with the locking ring removed. DESCRIPTION OF SYMBOLS 1... Base frame, 2... Wheel, 5, 6... Cross support leg, 10... Upper body, 11... Seat part, 16... Tension spring, 18... Locking ring, 19... Pull piece .

Claims (1)

[Scope of utility model registration request] The lower ends of a pair of cross-support legs, each of which is rotatably pivoted at its intermediate portion, are pivotably pivoted to the lower part of each base frame that pivotally supports a wheel, and a flexible seat is attached. The upper ends of the cross-support legs can be pivoted at both the front and rear ends of the seat rods of the upper body, which is formed by fixing a pair of seat rods and a pair of upright rods to which similarly flexible backrests are attached. A tension spring is attached between the upper and lower ends of one cross-support leg, and one end of the cable is connected to a locking ring that is attached to the intersection of the cross-support leg so as to be movable up and down. A folding wheelchair that is attached to the top of a standing rod.