Front leg mechanism of composite wheel leg type wheelchair

Abstract

The invention discloses a front leg mechanism of a composite wheel leg type wheelchair. The front leg mechanism of the composite wheel leg type wheelchair is characterized by mainly comprising a rear connecting plate position and posture adjusting mechanism, a front connecting plate position and posture adjusting mechanism, a power transmission mechanism, a variable transmission mechanism and a control system. The rear connecting plate position and posture adjusting mechanism comprises a box, a rear connecting plate, a spindle, a crank, a guide rod, a sliding block, a guide rod seat, a left screw, a left rack nut, an upper electromagnetic clutch, a left handle, a rear guide wheel, a front guide wheel and a lower shaft. The front connecting plate position and posture adjusting mechanism comprises a front connecting plate, a right screw, a right rack nut, a lower electromagnetic clutch, a right handle and an upper shaft. The power transmission mechanism mainly comprises a spindle, a middle small shaft, a lower small shaft, a front guide wheel, a rear guide wheel, a middle bottom wheel gear and an underneath bottom wheel gear. The variable transmission mechanism mainly comprises a nut, a spring, a middle bottom wheel gear, a friction plate, a rear guide wheel and an upper shaft. The control system mainly comprises a sensing detection module, a driving module and a timing module.

Description

technical field [0001] The invention relates to wheelchair technology, in particular to a front leg mechanism of a wheel-leg composite wheelchair. The mechanism facilitates climbing stairs and overcoming obstacles. Background technique [0002] At present, there are mainly following technologies about the front leg mechanism of the wheelchair for climbing stairs. The "electric walking barrier-free wheelchair" designed by Jiang Xiaodong and others discloses an electric walking barrier-free wheelchair (see patent CNlol073526A), which mainly consists of a seat frame, a back frame, front wheels, rear wheels, mechanical legs and a power system. , when the wheelchair goes up and down the stairs, it adopts the bionic technology of mechanical legs to simulate human walking. It is popularized and used in daily life. In Gong Daoxiong et al.'s "a hexapod stair climbing wheelchair" (see patent CN102755229A), the wheelchair system mainly includes a wheelchair, three chair front legs, ...

AI Technical Summary

Problems solved by technology

The disadvantage of this wheelchair is that it moves upwards against the stairs, the movement process of the front legs is complicated, it is difficult to control and manipulate, and the efficiency is low when running on flat ground. At the same time, due to its large size, it is difficult to use in ordinary houses

This kind of walking mechanism has flexible movement, fast walking speed, large movement space and small moment of inertia, but it is difficult to operate when encountering obstacles such as stairs and steps, and its application range is very limited.

In Dong Shangbin's "running multi-purpose wheelchair" (see patent 86210653), a kind of flat ground and stair running multi-purpose wheelchair is introduced. The front roller and the rear roller are all made up of multiple star-shaped wheels. To realize going up and down the stairs, the wheelchair belongs to the wheel-type stair-climbing device. This kind of stair-climbing device has a wide range of activities and flexible movements, but the stability is not high when going up and down the stairs, and the center of gravity fluctuates greatly, which will make the occupants feel uncomfortable.

In addition, the wheel-type stair climbing device is bulky and heavy, making it difficult to use it on ordinary residential stairs

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