Manual wheelchair with stepless transmission ratio adjustment

Abstract

The invention discloses a manual wheelchair with stepless transmission ratio adjustment. Existing manual wheelchairs are very strenuous in climbing. The manual wheelchair in the invention comprises achair frame, hand-cranking wheel assemblies and continuously variable transmissions; the two hand-cranking wheel assemblies are arranged at the two sides of the bottom of the chair frame respectively;the hand-cranking wheel assembly comprises a main wheel, a hand wheel ring, a tubular wheel shaft and a driving rotating shaft; the tubular wheel shaft is supported at the bottom of the chair frame;the main wheel is fixed with the outer end of the tubular wheel shaft; the driving rotating shaft and the tubular wheel shaft are coaxially arranged, and form a rotating pair; the hand wheel ring is fixed with the outer end of the driving rotating shaft; the number of the continuously variable transmissions is two; the two continuously variable transmissions correspond to the two hand-cranking wheel assemblies respectively; and stepless adjustment of the transmission ratio of the driving rotating shaft to the tubular wheel shaft is achieved. The wheel and the hand wheel ring, which are fixed together, in the prior art are separated into mutual rotation; the transmission ratio of the wheel to the hand wheel ring is adjusted by arranging the continuously variable transmissions; and a user can adjust the transmission ratio conveniently according to the strength of the user and the current road condition.

Description

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AI Technical Summary

Benefits of technology

This new device helps people who have difficulty walking on uneven surfaces with different levels or terrains without losing control over them due to lacking power from one side compared to another's wheels. It allows for easy customization based upon how hard they were doing upward at once (the force needed). Additionally it has two modes - manual mode where the driver uses both hands while driving) and automatic mode where only the feet touch down instead of just pushing against each other when navigating across an incline. Overall this technology improves safety and comfort during use.

Problems solved by technology

This patented technical solution described by the patents describes how electrically powered wheelshicle chains used on existing vehicles may cause difficulties during use due to their weight or lack of stability over long periods of time. There exist solutions involving specially designed devices called ratchets, where an electronic device changes the rotation frequency based upon certain criteria (such as distance traveled). These systems allow for easier control while still being effective at changing between different levels of resistance.

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