RU2774466C1 - Wheelchair chassis - Google Patents

Abstract

FIELD: transport engineering.

SUBSTANCE: invention relates to transport engineering and can be used as a mover of wheelchairs, including for overcoming the last flights of stairs for general use. The wheelchair chassis consists of a system of three low-pressure onboard pneumatic wheels located at the ends of one of the three radial assembly brackets rotating on the central axis, and a wheel drive mechanism. The on-board system consists of two structurally similar assemblies, in one of which the wheels are located at the corners of an equilateral triangle of structurally justified size, and in the other of which the wheels adjoin with their peripheral part to the line of conjugation of the vertices of the corners of an equilateral triangle. The group drive mechanism for six onboard wheels is made in the form of a two-stage friction roller, which compensates for the difference in the diameters of wheels of different assemblies, mounted on the central axis of the system of onboard pneumatic wheels.

EFFECT: simplification of the wheel drive mechanism and increase of chassis cross-country ability in both wheeled and wheel-walking modes of motion.

1 cl, 1 dwg

Description

The invention relates to transport engineering, in particular to off-road transport equipment, and can be used as a mover of wheelchairs to overcome the latest flights of stairs for general use.

Known author's wheelchair chassis /see. Pat. No. 2 758 958 (class A61G 5/06) dated 01/26/2021/, consisting of a system of three low-pressure onboard pneumatic wheels located at the ends of one of the three radial assembly brackets rotating on the central axis, and a wheel drive mechanism.

With all the advantages of the design scheme of the known prototype chassis, it can be improved in order to simplify the wheel drive mechanism and increase the cross-country ability of the chassis, both in wheeled and wheeled-walking modes of motion with overcoming obstacles in the form of ditches, thresholds, curbs, scarps, including flights of stairs for general use.

The stated goal is achieved by the fact that in the wheelchair chassis, consisting of a system of three low-pressure onboard pneumatic wheels located at the ends of one of the three radial assembly brackets rotating on the central axis, and the wheel drive mechanism, the onboard system consists of two structurally similar assemblies , in one of which the wheels are placed at the corners of an equilateral structurally justified size of the triangle, and in the other of which the wheels adjoin the peripheral part to the line of junction of the corners of the equilateral triangle, the group drive mechanism for six side wheels is made in the form of a two-stage friction roller that compensates for the difference in wheel diameters different assemblies, mounted on the central axis of the system of onboard pneumatic wheels.

The technical solution proposed by the invention is illustrated in Fig. (general side view of the onboard wheelchair chassis system).

The wheelchair chassis according to the technical solution proposed by the invention consists of a system of three low-pressure onboard pneumatic wheels located at the ends of one of the three radial assembly brackets rotating on the central axis, and a wheel drive mechanism. At the same time, the onboard system consists of two structurally similar assemblies, in one of which the wheels 1 are located at the corners of an equilateral structurally justified size of the triangle, and in the other of which the wheels 2 adjoin the peripheral part to the line of conjugation of the corners of the equilateral triangle. At the same time, the group drive mechanism for six side wheels is made in the form of a two-stage friction roller 3, which compensates for the difference in the diameters of wheels of different assemblies, mounted on the central axis 4 of the system of side pneumatic wheels.

Although the theoretical issues of overcoming obstacles by wheeled vehicles have not been sufficiently developed to date, it is considered /see, for example, Peskov V.I. car theory. Nizhny Novgorod: NGTU, 2006. 176 s./ that an all-wheel drive two-axle vehicle is able to overcome ditches and walls, respectively, with a width and height commensurate with the radius of the wheels.

The technical solution proposed by the invention minimizes the dependence of the width of the ditch and the height of the vertical obstacle on the radius of the wheels 1 (see Fig.), since the proposed technical solution converts a two-axle prototype vehicle into a three-axle vehicle both for driving in wheeled mode and for driving in wheel-walking mode.

The wheelchair with the proposed chassis acquires increased cross-country ability in comparison with the prototype chassis both on weakly bearing soils (sand, peat, snow, etc.) and on hard surfaces (asphalt, concrete, etc.) with overcoming obstacles in the form of ditches, thresholds, curbs, scarps, including flights of stairs for general use, both in wheeled and wheeled-walking modes of motion.

The wheelchair with the proposed chassis is able to move forward - backward, turn around, turn around, repeating the movements of wheelchairs on wheels, caterpillars and wheel-caterpillars, without an unreasonably complicated wheel drive mechanism.

Thus, according to the applicant, the technical solution proposed by the invention is new, has an inventive step and is industrially applicable.

Claims (1)

Wheelchair chassis, consisting of a system of three low-pressure onboard pneumatic wheels located at the ends of one of the three radial assembly brackets rotating on the central axis, and a wheel drive mechanism, characterized in that the onboard system consists of two structurally similar assemblies, in one of which the wheels are placed in the corners of an equilateral structurally justified size of the triangle, and in the other of which the wheels adjoin the peripheral part to the line of conjugation of the vertices of the corners of the equilateral triangle, the group mechanism for driving six side wheels is made in the form of a two-stage friction roller, compensating for the difference in the diameters of the wheels of different assemblies, mounted on the central axis of the onboard pneumatic wheel system.

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