Double-section double-caterpillar-band stair climbing wheelchair based on travelling wheel swing and method for going upstairs and downstairs

Abstract

The invention discloses a double-section double-caterpillar-band stair climbing wheelchair based on travelling wheel swing and a method for going upstairs and downstairs.The stair climbing wheelchair comprises a wheelchair body, two big traveling wheels, a caterpillar band stair climbing mechanism and a big wheel swing arm mechanism; the caterpillar band stair climbing mechanism comprises double caterpillar band mechanisms, and the caterpillar band mechanism at each side comprises a mechanism front segment, a mechanism rear segment and a rubber caterpillar band, wherein the mechanism front segment and the mechanism rear segment are hinged through a bearing axle into a whole mechanism for installing the rubber caterpillar band.After the caterpillar band stair climbing mechanism is folded on the flat ground, the outer sides of the caterpillar bands are supported by supporting bearings, the caterpillar bands are in a slightly slack state, which is beneficial for prolonging service life of the caterpillar bands, and the step that at ordinary times, when the caterpillar bands are not used for going upstairs and downstairs for a long time, a caterpillar band tensioning mechanism is adjusted repeatedly to remove tension force on the caterpillar bands is omitted.

Description

technical field [0001] The invention relates to a stair-climbing wheelchair, in particular to a mechanical structure of a wheel-track compound stair-climbing wheelchair. Background technique [0002] The current four-wheeled wheelchair is an indispensable means of transportation for the elderly, infirm and those with lower limb disabilities. However, the four-wheeled wheelchair cannot go up and down stairs, which limits the scope of use. Wheelchair users living in buildings without elevators cannot go up and down stairs, which affects their Go out and participate in social activities. my country has rapidly entered an aging society, and the travel problems of the elderly have become increasingly prominent. [0003] In order to solve the problems referred to above, split and integrated wheel-track composite stair-climbing wheelchairs have appeared on the market. [0004] The split-type structure is to fix the ordinary wheelchair on the crawler for climbing stairs. For examp...

AI Technical Summary

Problems solved by technology

[0006] 1. The stair-climbing wheelchair disclosed in Chinese patent CN201210590075.0, because the track can only be lifted or lowered as a whole, and cannot be folded, makes the front and rear dimensions of the wheelchair larger, resulting in poor passability of the wheelchair at the half-floor platform of the stairs

[0007] 2. The stair-climbing wheelchair disclosed in Chinese patent CN201320833460.3 has the large walking wheel installed in the front position, cannot be used on flat ground, and cannot be operated by the operator independently

[0008] 3. The stair-climbing wheelchair disclosed in Chinese patent CN201510048349.7 cannot pass through the obtuse angle (angle greater than 90 degrees and less than 180 degrees) and the reflex angle (angle greater

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