Chair back curvature adjusting device

Abstract

The invention discloses a chair back curvature adjusting device. The device comprises a flexible chair back, a first retaining mechanism, a second retaining mechanism, a support for supporting the chair back and at least one locking mechanism, the first retaining mechanism is connected between a first position of the chair back and the support, and the second retaining mechanism is connected between a second position of the chair back and the support, so that the chair back is retained on the support; the second holding mechanism is provided with a second connecting part and a second movable part; the second movable part can freely slide on the support; the second movable part is fixed on the support through the locking mechanism, the second connecting part consists of a fixed part connected to the second movable part, an extending part connected to the chair back and a positioning mechanism connected between the extending part and the fixed part, and the position of the extending partcan be axially changed relative to the fixed part; therefore, by means of the movement of the extending part, the axle distance of the second connecting part is prolonged, and the curvature of the surface of the chair back is changed to be used as compensation for curvature adjustment.

Description

technical field [0001] The invention relates to a chair, in particular to a chair back curvature adjustment device which can adjust the curvature and position of the chair back according to the needs of use, so as to make the chair back more snug. Background technique [0002] In order to increase the comfort of the ride, the requirement of the back of the chair is absolutely one of the indispensable factors. In a long-term sitting posture, if the back of the human body is not properly supported, not only will the backache be felt, but the spine may also be caused. Permanent damage such as deformation. [0003] In the previous technology, the back of the chair is bulged to change the curvature of its surface in an inflatable way, so that the occupant's lower back can be supported, although it can achieve a certain effect, but the cost is expensive; and these inflatable components must be buried in the back of the chair , it will be difficult to overhaul and maintain if it b...

AI Technical Summary

Problems solved by technology

[0003] In the previous technology, the back of the chair is bulged to change the curvature of its surface in an inflatable way, so that the occupant's lower back can be supported, although it can achieve a certain effect, but the cost is expensive; and these inflatable components must be buried in the back of the chair , it will be difficult to overhaul and maintain in case of failure or wrong action

Furthermore, these inflatable components are buried in a fixed position, and after inflation, they can only provide support for specific parts of the human body, and the deformation of the seat back is limited, making it difficult to fully meet the needs of the occupants.

[0004] In addition, the adjustable chair back device disclosed in the patent application No. 201610803111.5 filed by the inventor on September 6, 2016 can achieve the function of adjusting the curvature of the chair back with simple assembly and structure, but the chair back The curvature can only be adjusted vertically. After changing the curvature of the chair back through the displacement of the second holding mechanism, if the lower part of the chair back bends at a large angle, it may not be able to fully attach to the back of the human body, resulting in insufficient support.

Images