Wheelchair structure capable of changing revolution radius of travelling wheels

Abstract

The invention relates to a wheelchair structure capable of changing the revolution radius of travelling wheels. The wheelchair structure comprises a bottom plate, wherein a plurality of travelling wheel groups are mounted below the bottom plate; each travelling wheel group comprises a driving disk which is rotatably connected with the bottom plate; a plurality of parallelogram mechanisms are sequentially mounted on the outer end surface of each driving disk in the circumferential direction; each parallelogram mechanism comprises a locating rod which is fixedly connected with the correspondingdriving disk; the extending direction of each locating rod is parallel to the outer end surface of the corresponding driving disk; in each parallelogram mechanism, a connecting rod parallel to the corresponding locating rod is a translation rod; and each travelling wheel is rotatably mounted at one end away from the rotating axis of the corresponding driving disk, of the corresponding translationrod. According to the wheelchair structure disclosed by the invention, according to the height of an obstacle which needs to be cut across, the revolution radius of the travelling wheels in the travelling wheel groups along the driving axis can be adjusted, and the angle of a seat plate can be adjusted according to the climbing angle.

Description

technical field [0001] The invention belongs to the technical field of wheelchairs, and in particular relates to a wheelchair structure capable of changing the revolution radius of walking wheels. Background technique [0002] Wheelchairs are chairs equipped with wheels that can help replace walking, and are divided into electric and manual folding wheelchairs. It is an important mobile tool for the home rehabilitation of the wounded, the sick, and the disabled, turnover transportation, medical treatment, and outing activities. [0003] In the use of wheelchairs, there is a need to overcome obstacles, and the driving wheels on each side of the current wheelchair structure are arranged in an equilateral triangle by three wheel bodies, so that the wheel body can revolve around the center of the equilateral triangle while rotating. , for some step positions, the diameter of the compound wheel can be increased by the revolution of the wheel body to realize the function of overc...

AI Technical Summary

Problems solved by technology

[0003] In the use of wheelchairs, there is a need to overcome obstacles, and the driving wheels on each side of the current wheelchair structure are arranged in an equilateral triangle by three wheel bodies, so that the wheel body can revolve around the center of the equilateral triangle while rotating. , for some step positions, the diameter of the compound wheel can be increased by the revolution of the wheel body to realize the function of obstacle surmounting, but this method requires a large driving force, and the combined volume of the wheel body is too large

[0004] The inventors found that most of the current obstacle-crossing wheel trains are a combination of three wheel bodies, and obstacles are overcome by using the revolution of the combined wheel train. However, due to the different heights of obstacles, different obstacles are distributed on different roads. For example, curbs and steps have different heights, and some higher obstacles cannot be passed by traditional obstacle-crossing wheels, and it is still necessary to carry the load as a whole to achieve obstacle-crossing. If there is no barrier ability, it will cause a sharp increase in the volume of the wheel train, which is not conducive to the use of wheelchairs.

[0005] Simultaneously, the seat plate and the base plate of the existing stair-climbing wheelchair are fixedly connected, and the angle between the seat plate and the base plate cannot be adjusted according to the inclination angle of the stairs to be climbed, and the seat plate cannot be kept horizontal or approximately horizontal; People have a tendency to overturn backwards, causing psychological panic to the passengers and affecting the use

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