Chair capable of changing gravity center along with changes in elevation angle of backrest

Abstract

The invention relates to a chair capable of changing the gravity center along with changes in the elevation angle of a backrest. The chair comprises front chair legs, rear chair legs, a chair seat, an angle adjusting mechanism, a backrest, a headrest and handrails, and is characterized in that the rear chair legs are articulated with the backrest, the backrest is articulated with the chair seat, the chair seat is articulated with pull rods, the pull rods are articulated with the rear chair legs for forming a four-link mechanism, rear rolling wheels are arranged at the tail ends of the rear chair legs, the front chair legs are fixedly connected with the chair seat, and the angle adjusting mechanism is used for controlling the angle of any one articulation point in the four-link mechanism. When the angle adjusting mechanism is in a locked state, the four-link mechanism is fixed, and the angle between the backrest and the chair seat is fixed; and when the angle adjusting mechanism is in a free state, the four-link mechanism can move freely and drive the rear rolling wheels to roll front and back, the larger the angle between the backrest and the chair seat, the larger the interval between the front chair legs and the rear chair legs, and the function of changing the gravity center along with the changes in the elevation angle of the backrest can be further realized.

Description

technical field [0001] The invention relates to a chair with a body-building function in which the center of gravity changes with the elevation angle of the backrest. Background technique [0002] Most of the existing reclining seats on the market cannot be flattened at the backrest elevation angle, and the center of gravity is unstable, easy to fall backwards, and the function is single, lacking additional functions and value. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a chair that can be used as an office chair, a chair, and a sit-up massage fitness machine. The center of gravity changes with the elevation angle of the backrest. [0004] The technical solution of the present invention is: the chair whose center of gravity changes with the backrest elevation angle, comprises front chair leg, rear chair leg, seat, backrest, backrest angle adjustment mechanism and headrest and armrest, is characterized in tha...

AI Technical Summary

Problems solved by technology

[0002] Most of the existing reclining seats on the market cannot be flattened, and the center of gravity is unstable, easy to fall backwards, and the function is single, lacking additional functions and value

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