A bracket driving mechanism for swivel chair chassis

Abstract

The invention discloses a bracket driving mechanism for a swivel chair chassis, which comprises a base, a bracket and a seesaw. The front part is provided with a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged with the front end of the seesaw, the other end of the first connecting rod is hinged with one end of the second connecting rod through a third pin and the third The pin shaft is connected with the bracket, and the other end of the second connecting rod is hinged with the base through the second pin shaft, and there are track grooves cooperating with the first pin shaft to guide the movement track of the bracket symmetrically on both sides of the bracket , the first pin shaft is installed in the track groove, and the seesaw rotates through the first and second connecting rods to drive the bracket to move along the track of the track groove. The bracket driving mechanism of the present invention can match the reclining force of the chair back according to the weight of the human body, so that people who are light or heavy can easily recline and get up.

Description

technical field [0001] The invention relates to the technical field of swivel chairs and office chairs, in particular to a bracket driving mechanism for a swivel chair chassis. Background technique [0002] The swivel chair chassis, also known as the swivel chair tray, is an important part installed under the seat cushion of the swivel chair. The lifting of the seat cushion and the adjustment of the tilt angle of the backrest are all done by the chassis. [0003] The current swivel chair tray is generally composed of an upper tray, a lower joist, a rotating shaft, and a spring device. After the upper turntable is fixed to the back of the swivel chair seat, the swivel chair can be properly tilted around the rotating shaft and can be actively restored. There is comfort. For example, a Chinese patent discloses a tray (patent number: 02287885.8), which mainly includes a bottom plate, a movable seat, a tapered tube and an adjustment device. , the tapered tube fixing plate and t...

AI Technical Summary

Problems solved by technology

However, when sitting on the seat installed with the above-mentioned tray and leaning backward, since the gravity of the human body is supported by the backrest and the specific gravity gradually increases, the gravity loaded on the seat surface gradually decreases, and the restoring force transmitted from the gravity to the backrest changes accordingly. Small, resulting in insufficient backrest recovery force at the maximum reclining angle, and the recovery force is too dependent on the elastic recovery of the elastic reset device, so the range of applicable people is limited, and it is difficult for lighter people to recline, and it is difficult for heavier people to recover after reclining , unable to achieve the most reasonable matching resilience

[0005] The problem with the above-mentioned chassis is that when the human body is tilting backward, under the same gravity loading of the seat, the restoring force moment of the chassis will gradually decrease or remain the same. The pressure becomes larger and the driving force becomes larger, resulting in insufficient recovery force against the driving force, and the recovery force is too dependent on the elastic recovery of the elastic reset device, so the range of applicable people is limited, and it is difficult for light weight people to tilt, and heavy weight people Difficulty getting back up after leaning over

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