Office chair realizing safe rise and fall

Abstract

The invention belongs to the technical field of office chairs, and in particular relates to an office chair realizing safe rise and fall. The office chair comprises a chair base, a lifting rod, a triggering mechanism and a base. For the office chair, limiting clamping plates, a gear, a triggering block and a threaded sleeve are designed at the inner side of the lifting rod, due to the match amongthe limiting clamping plates, the gear, the triggering block and the threaded sleeve, the rise and fall of the lifting rod realize the mechanical transmission, and when the triggering block is triggered by the triggering mechanism to move downwards, the trigging block squeezes the limiting clamping plates so that the limiting clamping plates lose the limitation for the gear and the threaded sleeve; and after the chair base bears the weight, the chair base transmits the weight-bearing pressure to the threaded sleeve through a lifting inner rod, through the threaded match between the threaded sleeve and internal threads on a lifting outer sleeve, the lifting inner rod can slide downwards relative to the lifting outer sleeve, the lifting function is realized, and through the mechanical realization of the lifting function of the lifting chair, the accident of air cylinder explosion caused by using the air-pressure type lifting chair is reduced.

Description

technical field [0001] The invention belongs to the technical field of office chairs, in particular to a safety lifting office chair. Background technique [0002] Currently, there are three types of lifting devices used in chair lifts on the market: hydraulic, mechanical and pneumatic. At present, most home or office use air pressure; the air lift chair contains a cylinder, and the piston pneumatic rod in the cylinder moves up and down to control the lift of the chair. The air lift chair has the advantages of height adjustment, comfortable sitting, low price, simple structure, flexible operation, etc. Advantages, welcomed by the majority of consumers, has become the most common practical seat for modern home and office. [0003] The cylinders of regular manufacturers are filled with nitrogen, the concentration is generally above 99%, and the pressure is about one or two atmospheres. [0004] However, in recent years, there have been many safety accidents caused by cylinde...

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Problems solved by technology

[0004] However, in recent years, there have been many safety accidents caused by cylinder explosions in the actual use of pneumatic chair lifts; causing varying degrees of damage to users; and there are probably three types of explosions: one is that the purity of nitrogen is insufficient, and at high temperatures If the environment or friction is too frequent, the temperature of the cylinder will rise suddenly, the pressure will increase, and an explosion may occur; the second is that the wall of the cylinder container is not strong enough or the material is poor, and an explosion may occur; the third is that the seal is not tight, resulting in gas explosion. out

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