SI24269A - Wheelchair hand drive mechanism - Google Patents

Abstract

The hand wheel drive mechanism of the wheelchairs has an essential element of the driving lever (1) which is attached to the axis of each of the driving wheels (2) (left and right) of the wheelchair with the lower end, and with the upper end extending above said wheel, within the reach of the user's hand. By rotating said lever around the axis of the main wheel (2), the user clutches it along the drive ring (3), turning the wheel (2) forward or backward, and thus moves the cart in the desired direction.

Description

Alojz Tomazin

MANUAL DRIVING TROLLEY MECHANISM

The subject of the invention is a manual wheelchair drive mechanism.

Existing hand-operated wheelchairs are largely constructed by affixing a drive ring to each of the two drive wheels on its outside. The wheelchair user drives the wheelchair by twisting said rings with his hands. Such a solution, however, is quite uncomfortable for the wearer, as the hands in the wrists twist when gripping in certain positions.

The present invention solves the aforementioned disadvantage by a simple propulsion mechanism, which will be described below in detail and shown in the figures showing:

FIG. 1 isometric wheelchair with exploded propulsion mechanism;

FIG. 2 detail As picture 1.

An essential part of said drive mechanism according to the invention is the drive arm (1), which is articulated to the axle of each of the drive wheels (2) (left and right) of the wheelchair with the lower end extending above said wheel so that it is within reach of the trolley user. Said linkage allows the lever to be tilted in all directions and can be made in various ways: either as a joint or as a conventional radial sliding bearing (1.2) with high play, with the bearing in contact with the drive wheel. The bearing thus arranged permits the crank (1) to tilt around the wheel axis (2) and, by the aforementioned clearance, also to a few degrees in the lateral direction.

The actuator of the wheel (2) is actuated by attaching the actuator lever (1) to itself by pushing it against the drive ring (3) (which is attached to the wheel (2) and is an integral part of the existing wheelchairs, intended for by their direct manual drive) or by the tire of the wheel (2) (in the case when the trolley does not have a drive ring (3)) and then pushes it forward or backward by pushing it against said ring or against the tire. The drive lever (1) rotates the drive ring (3) and the wheel (2) with it, or the direct wheel (2) (design without ring (3)) for a certain angle of rotation around its point of engagement (1.1). for a given angle in the desired direction (forward or backward). A single rotation of the drive lever (1) is, of course, sufficient only for the short movement of the trolley, so that the movements described above must be repeated continuously, with each lever (1) moving away from the drive ring (3) during the return movements, which allows said clearance. bearings (1.2).

At the point where the drive lever (1) touches the drive ring (3) or tire, a nozzle (1.3) of material with the highest friction coefficient (eg, hard rubber) is attached to the lever to increase the friction between said lever and the ring. At this point of contact, the channel (1.4), which fits into the shape of the ring (3), significantly increases the friction between the two, thereby reducing the necessary force for the wheelchair user to press the lever (1) against the ring during working movement. (3).

Claims (4)

PATENT APPLICATIONS Wheelchair manual drive mechanism, characterized in that its essential part is a drive arm (1), which is articulated with the lower end on the axis of each wheelchair (2) (left and right) of the wheelchair, with the upper end however, it extends above said wheel so that it is within the reach of the user of the trolley, said articulated clamp allowing the arm to be tilted about the axis of the wheel (2) and at least a few degrees in the lateral direction, and may be made in various ways: as a joint or as in the form of a conventional coaxial radial sliding bearing (1.2) with a large clearance, which allows the arm (1) to be tilted around the axis of the wheel (2) and also by a few degrees in the lateral direction. Wheelchair manual drive mechanism according to the first claim, characterized in that a nozzle (1.3) is attached to the lever at the point where the drive arm (1) touches the drive ring (3) or tire due to friction. as much friction factor as possible (eg hard rubber). Wheelchair manual drive according to the second claim, characterized in that the lever (1) has a groove (1.4) at the point of said contact, which fits in the shape of the ring (3), which significantly increases the friction between them. thereby reducing the force required by the wheelchair user to press the lever (1) against the ring (3) while working. 4. The process of using a wheelchair drive mechanism according to the invention, characterized in that the user pulls the drive lever (1) to itself by pushing it against the drive ring (3) (which is attached to the wheel (2) and is an integral part wheelchairs (2) (in the case where the trolley does not have a drive ring (3)), and then pushes it forward against the said wheel or against the tire, or in the rear, the drive arm (1) being rotated about the pivot point about its clamp (1.1) and rotating the drive ring (3) and the wheel (2) with it, or the direct wheel (2) (without ring (3) )) for a given angle in the desired direction (forward or backward); a single rotation of the drive lever (1) is, of course, sufficient for the short movement of the trolley only, so that the movements described above must be repeated permanently, with each lever (1) being moved away from the drive ring (3) during return movements, which allows said clearance bearings (1.2).