JP3039498U - Wheelchair retraction prevention mechanism - Google Patents

Abstract

(57) [Abstract] [Problem] To provide a wheelchair having a backward movement preventing function that does not backward when going uphill. A cam is brought into contact with a tire of a rear wheel to stop only backward rotation. Also, the function of the conventional wheelchair can be exerted by disconnecting the contact of the cam.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a wheelchair that has a backward-prevention function that prevents the user from standing still on the ground even if he releases his hand from the hand rim without braking when traveling uphill.

[0002]

[Prior art]

 As a way to take a break when going up a long slope in a wheelchair, I had to stop by holding the hand rim firmly or brake and take a break. In the former case, there is almost no break. In the latter case, unless the brakes are applied quickly, the casters will move backwards and the casters will turn in the opposite direction. Similarly when re-starting, when the brakes are released, the car retreats and quick operation is required. Strong force is required to turn casters facing the opposite direction to the direction of travel, and this method is also impossible. Therefore, there can be no way to take a break on the slope. Uphill is an obstacle for wheelchair users and narrows the radius of action.

[0003]

[Problems to be solved by the device]

 The problem I am trying to solve is a wheelchair that allows me to go uphill while taking a break without going back uphill. The purpose of the present invention is to provide a wheelchair that does not require a brake operation as described in the related art and does not move backward even when the hand is released from the hand rim, and has a reverse-prevention function that facilitates climbing up a slope.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the anti-reverse mechanism of the present invention makes the cam contact the left and right rear wheel tyres, the cam slips in the forward direction and the tire rotates, but the reverse rotation causes the cam to hit the tire and reverse the backward rotation. Stop. It means to move forward but not to move backward. Also, when the contact of the cam is cut off, the rear wheel becomes free and the wheelchair functions exactly like a normal wheelchair.

[0005]

[Embodiment of the invention]

 Embodiments of the invention will be described with reference to the drawings. As shown in FIG. 1, the bracket 1 is taken out from the frame 6 and the camshaft 2 and the cam 3 are attached. A switching lever 4 is attached to the cam 3, which also serves as a weight for constantly pressing the cam 3 against the tire. A leaf spring 5 is attached to the bracket 1, and the engagement between the leaf spring 5 and the protrusion D of the cam 3 allows the cam 3 to be switched between a state in which the cam 3 is in contact with the tire 7 and a state in which the cam 3 is not in contact with the tire 7.

As shown in FIG. 2, when the cam 3 is in contact with the tire 7, the cam 3 can slide forward even if the tire 7 rotates in the forward direction.

As shown in FIG. 3, when the tire 7 tries to rotate in the backward direction, the cam 3 hits the tire 7 due to friction with the tire 7, and the backward movement becomes impossible. In the case of a tube tire, the C portion of the bracket 1 is for stopping the cam 3 from slipping into the tire 7 and making one full rotation.

FIG. 4 shows a state in which the cam 3 is lifted by the switching lever 4 and the leaf spring 5 holds the projection D of the cam 3 so that the cam 3 does not contact the tire 7. That is, it returns to the conventional wheelchair function in the neutral state.

[0009]

【Example】

 FIG. 5 shows the existing brake 8 with a backward movement prevention mechanism. In this example, the number of parts is small, the mounting space is reasonable, and the original function of the brake is not impaired.

As shown in FIG. 6, two existing nuts 9 are removed and a backward movement preventing mechanism is attached.

[Brief description of the drawings]

FIG. 1 is a left side view and a cross-sectional view of a wheelchair equipped with a backward movement prevention mechanism.

FIG. 2 is a left side view of the wheelchair showing a state in which the tire rotates forward and the cam is slipping.

FIG. 3 is a left side view of the wheelchair showing a state in which the tire starts to rotate backward and the cam stops and the rotation is stopped.

FIG. 4 is a left side view of the wheelchair showing a neutral state with a switching lever.

FIG. 5 is a perspective view in which a backward movement prevention mechanism is attached to an existing brake.

FIG. 6 is an exploded perspective view in which a backward movement prevention mechanism is attached to an existing brake.

[Explanation of symbols]

 1 Bracket 2 Camshaft 3 Cam 4 Switching lever 5 Leaf spring 6 Wheelchair frame 7 Tire 8 Existing brake 9 Nut 10 Retraction prevention mechanism C Bracket 1 cam rotation stop D Cam 3 protrusion

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[Procedure amendment]

[Submission date] November 28, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

Claims (2)

[Utility model registration claims] 1. A backward movement preventing mechanism for a wheelchair, comprising a cam mechanism for bringing a cam into contact with a tire for forward rotation, but for stopping only backward rotation. 2. A backward movement preventing mechanism for a wheelchair, wherein a backward movement preventing function and a conventional wheelchair function are switched by bringing a cam into contact or non-contact.