Chair frame

Abstract

The invention discloses a chair frame, which comprises bottom feet, a fixed seat, a chair back frame, a seat frame, a first linkage frame and a second linkage frame. The first linkage frame and the bottom end of the chair back frame are fixedly connected or integrally formed and rotatably installed on the fixed seat; the second linkage frame and the bottom surface of the seat frame are fixedly connected or integrally formed and are movably mounted on the fixed seat; the chair frame also includes left and right sets of first connecting rod mechanisms, left and right sets of second connecting rod mechanisms, left and right second limiting long holes, at least one second linkage rod and an electric push rod; by means of the technical scheme, the chair back frame can topple backwards, meanwhile, the seat frame moves upwards and backwards, correspondingly, in the lifting process of the chair back frame, the seat frame moves forwards and downwards, the distance between the bottom of the chair back frame and the rear part of the seat frame is kept unchanged all the time, therefore a zero displacement effect is achieved, and the back rubbing phenomenon of the back of a human body and the chair back is avoided.

Description

technical field [0001] The invention relates to the technical field of furniture, in particular to a chair frame. Background technique [0002] The comfort of the chair is directly related to the quality of people's work and life. More and more companies are researching the seat-back linkage mechanism to realize self-adaptive functions and improve seat comfort. [0003] At present, the seat-back linkage mechanism used in seats on the market has a complex structure, high difficulty in production and processing, resulting in high cost; as the Chinese patent document with the publication number CN104223821B discloses a swivel chair chassis, which is composed of a plurality of connecting rods and brackets. The frame and the base constitute a four-bar linkage mechanism. When the rocker connected to the backrest rotates, the bracket connected to the seat moves upwards and backwards as a whole, and according to the weight of the human body, the reclining force of the backrest has ...

AI Technical Summary

Problems solved by technology

[0006] 1) The center of gravity of the human body and the chair is moved backward, and the chair is easy to tip backward;

[0007] 2) The backrest will bear a large force, so it is necessary to improve the material and structural stability of the backrest, thereby increasing the production cost;

[0008] 3) Correspondingly, the chair mainly provides support to the back of the human body through the backrest, while the sitting back only has a role in fixing the position of the buttocks of the human body, which does not conform to the force of the human body when it is usually lying down, so that the human body The overall body is not in a comfortable state. After lying on the back for a long time, the human body will feel more tired

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