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A manual wheelchair with infinitely adjustable transmission ratio

A technology of infinitely adjustable and manual wheelchairs, which is applied to patient chairs or special means of transport, vehicle ambulance, medical transportation, etc., and can solve problems such as speed drop at maximum and minimum gears, effort, and reduction in the effect of shifting

Active Publication Date: 2022-04-15
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some wheelchair users have no need for electric wheelchairs, but when using wheelchairs to climb uphill, it is very strenuous, so they will face the problem of whether to spend 3 times the price to solve the problem of going uphill
At present, there have been invention patents to deal with this situation, such as patent CN201520004697.X, which uses a ratchet chain transmission, which can achieve speed change like a bicycle with variable speed. However, the biggest defect of this chain ratchet transmission is that it is easy to If the chain is dropped, the quality of the chain is very high, and its shifting effect will decrease with time, and there will be a problem of speed drop from the maximum gear to the minimum gear

Method used

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  • A manual wheelchair with infinitely adjustable transmission ratio
  • A manual wheelchair with infinitely adjustable transmission ratio
  • A manual wheelchair with infinitely adjustable transmission ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 and 2 As shown, a manual wheelchair with infinitely adjustable transmission ratio includes a chair frame 1 , auxiliary wheels, a manual wheel assembly, a continuously variable transmission 2 , a speed control handle 3 and an adjustment transmission assembly 4 . The chair frame 1 is provided with a cushion, a backrest and two armrests. The hand wheel assembly is arranged on both sides of the bottom of the chair frame 1 respectively. The hand wheel assembly includes a main wheel 5, a hand wheel rim 6, a tubular axle 7 and a drive shaft 8. The tubular axle 7 is supported on one side of the bottom of the chair frame 1 . The main wheel 5 is fixed to the outer end of the tubular axle 7 . The driving rotating shaft 8 passes through the central hole of the tubular wheel shaft 7 and forms a coaxial rotating pair with the tubular wheel shaft 7 . The outer end of the hand wheel ring 6 and the drive shaft 8 is coaxially fixed. Hand wheel rim 6 is positioned a...

Embodiment 2

[0033] Such as Figure 4 As shown, the difference between this embodiment and embodiment 1 is:

[0034] 1. In the driving wheel 2-1 and the driven wheel 2-3, two conical unilateral wheels all form a sliding pair with the driving shaft 8 or the transmission shaft 2. Two springs 2-4 are sleeved on each drive shaft 8; the opposite ends of the two springs 2-4 are fixed with the drive shaft 8, and the other ends are against the opposite sides of the drive wheel 2-1 respectively; The root spring 2-4 applies elastic force to the two tapered unilateral wheels in the drive wheel 2-1, so that the distance between the two tapered unilateral wheels in the drive wheel 2-1 tends to decrease.

[0035] 2. The adjusting rotating shaft 4-2 is provided with four sections of threads 4-3 arranged in sequence. Any two sections of adjacent threads 4-3 all rotate in opposite directions. There are four sliders 4-4; the four sliders 4-4 and the chair frame 1 form a sliding pair sliding in the horizo...

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Abstract

The invention discloses a manual wheelchair with infinitely adjustable transmission ratio. The existing manual wheelchair climbs a slope very strenuously; the present invention comprises a chair frame, a hand wheel assembly and a continuously variable transmission. Two hand wheel assemblies are respectively arranged on both sides of the bottom of the chair frame. The hand wheel assembly includes a main wheel, a hand wheel rim, a tubular axle and a drive shaft. Tubular axles are supported at the bottom of the chair frame. The main wheels are fixed to the outer ends of the tubular axles. The driving rotating shaft is arranged coaxially with the tubular wheel shaft, and constitutes a rotating pair. The outer end of the hand wheel ring is fixed with the drive shaft. There are two continuously variable transmissions. The two continuously variable transmissions correspond to the two hand wheel assemblies respectively to realize the stepless adjustment of the transmission ratio between the drive shaft and the tubular wheel shaft. The invention separates the fixed wheels and the hand wheel rim in the prior art into mutual rotation, and adjusts the transmission ratio of the wheel and the hand wheel rim by setting a continuously variable transmission, which is convenient for users to adjust according to their own strength and current road conditions. Adjust the transmission ratio.

Description

technical field [0001] The invention belongs to the technical field of manual wheelchairs, in particular to a manual wheelchair with infinitely adjustable transmission ratio. Background technique [0002] According to the statistics of the World Bank, in 2019, China ranks tenth in the list of countries with aging population. The proportion of elderly population is as high as 11%. The number of elderly population is as high as 246 million. At present, the number of elderly people in our country continues to grow, and the number of disabled people remains high. The emergence of wheelchairs has brought great convenience to the two groups of people. However, with the increase in its usage rate, a serious problem has emerged—the operation of wheelchairs. It is laborious and difficult to go uphill manually. In order to improve the convenience of wheelchairs, electric wheelchairs are now invented. The operation of wheelchair users is more convenient. Going uphill is no longer a pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61G5/02A61G5/10
CPCA61G5/022A61G5/023A61G5/1051
Inventor 李晨王志强林林刘绍卿
Owner HANGZHOU DIANZI UNIV
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