Seat and backrest linkage chair

Abstract

The invention relates to a seat and backrest linkage chair, which comprises a pedestal, a chair seat, a backrest and armrests at two sides of the chair seat, the armrests and the pedestal enable rigid connection, two armrests are respectively hinged to left and right sides of the backrest, the chair seat comprises a seat frame for assembling a cushion and a slide plate connected to the pedestal in a slide mode, two sides of the rear end of the seat frame are hinged to left and right sides of the backrest, a front end of the seat frame is hinged to the slide plate, the seat frame and the slide plate enable back and forth simultaneous movement when the backrest rotates, an extension spring capable of resetting the slide plate is arranged in the pedestal, and the extension spring is arranged along the motion direction of the slide plate. the backrest and the armrest are hinged, the seat frame and the backrest are hinged, when the user is leaned, the chair seat can simultaneously move by following with the user, the chair seat has supporting effect for human waist, and the backrest clings to the back of the user so that displacement can not be generated, thereby comfortableness is ensured. The extension spring is arranged along the movement direction of the slide plate, no matter the extension spring is in a stretching state or a contraction state, the force is the force on the length direction (deformation direction), and the extension spring service life is prolonged.

Description

technical field [0001] The invention relates to a chair, in particular to a seat-back linkage chair. Background technique [0002] As an important office tool in daily office life, office chairs are directly related to the quality of people's work and life. At present, many office chairs on the market use a general-purpose chassis. Since the human-machine size matching relationship between the backrest and the seat surface has not been carefully considered, the seat backrest, especially the lumbar support, is separated from the human waist during the user's reclining process, and the two directly form a suspended gap, resulting in In the reclining state, the seat loses support for the human waist, which is what we commonly call "running waist". The lack of effective support for the human spine leads to many sedentary health problems; at the same time, due to the universal chassis, the backrest and seat surface The size matching relationship between the human body and the ma...

AI Technical Summary

Problems solved by technology

At present, many office chairs on the market use a general-purpose chassis. Since the human-machine size matching relationship between the backrest and the seat surface has not been carefully considered, the seat backrest, especially the lumbar support, is separated from the human waist during the user's reclining process, and the two directly form a suspended gap, resulting in In the reclining state, the seat loses support for the human waist, which is what we commonly call "running waist". The lack of effective support for the human spine leads to many sedentary health problems; at the same time, due to the universal chassis, the backrest and seat surface The size matching relationship between the human body and the machine has not been studied carefully. When the user is reclining, the buttocks and the seat surface are relatively fixed, while the seat back rubs upwards against the human back, causing the discomfort of "rubbing the back and pulling clothes" and also causing unsightly appearance.

In addition, when the user reclines, as the backrest reclines, the center of gravity of the human body also moves backward and deviates from the load-bearing center of the seat, which is prone to tipping over and poses a potential danger.

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