Angle adjusting mechanism and adjustable backrest thereof

Abstract

The embodiment of the invention discloses an angle adjusting mechanism and an adjustable backrest thereof. The mechanism comprises an adjusting tooth plug, which comprises a tooth cap and a tooth column, first sawteeth are annularly and uniformly distributed on the tooth cap, and second sawteeth are annularly and uniformly distributed on the tooth column; an adjusting tooth holder, on which a first tooth groove is formed; a first connecting piece, on which a second tooth groove is formed; wherein the adjusting tooth seat is provided with a first through hole, and the adjusting tooth plug penetrates through the first through hole, so that the first sawteeth and the second sawteeth are arranged in the first tooth groove and the second tooth groove respectively. After the first saw teeth and the second saw teeth rotate by the distance of one groove position in the same direction, the relative rotation angle between the first connecting piece and the adjusting tooth holder is the difference value of the sum, so that the rotation angle is small, and therefore fine adjustment operation of the angle between the first connecting piece and the adjusting tooth holder is achieved, adjustment operation is easy and convenient, and the adjustment precision is high.

Description

technical field [0001] The invention relates to the technical field of backrest wheelchair products, in particular to an angle adjustment mechanism and an adjustable backrest thereof. Background technique [0002] A backrest wheelchair is a wheelchair with a backrest assembled on a frame and equipped with wheels to help replace walking, and it is also a common medical device. Backrest wheelchairs can not only meet the transportation needs of physically disabled and handicapped people, but also facilitate family members to move and take care of patients, enabling patients to perform physical exercises and participate in social activities with the help of backrest wheelchairs, so they have entered many ordinary families and are widely used application. [0003] However, the backrest wheelchairs in the prior art have the following technical defects and deficiencies: the backrest angle of most traditional backrest wheelchairs cannot be adjusted or is difficult to adjust; in add...

AI Technical Summary

Problems solved by technology

[0003] However, there are the following technical defects and deficiencies in the backrest wheelchairs in the prior art: the backrest angle of most traditional backrest wheelchairs cannot be adjusted or is difficult to adjust; The backrest angle adjustment is relatively large (that is, only a large angle can be adjusted), and the backrest angle adjustment is not accurate, which is not suitable for most usage scenarios, which seriously affects the customer experience

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