Chair lift is a novel chair, composed of a backrest, a seat plate, a bracket, a rocker arm bracket, lifting and positioning device, chair legs composition structure, chair lift bracket and a chair between the feet is composed of a bracket is hinged with a rocking arm, hinged on the chair legs hinged shaft as the center of rotation, from and effective implementation of the seat plate lifting, lifting chair divided into three categories, that is, hydraulic, mechanical, pneumatic, due to the chair lift styles differences, making chair lift use mode is also different, but regardless of what styles of chair lift will face do not fall down and other issues, then chair lift descent method is how? The chair lift structure along with the rapid development of social economy, the science and technology has been greatly improved, lifting chair is widely used in daily work and learning, in understanding between the chair lift drop method, lifting chair structure first to understand how the lifting chair height can be adjusted up and down, under a chair surface for adjusting the height of lifting device, lifting device can be divided into pneumatic, hydraulic, hydraulic lifting chair is expensive, the structure is relatively complex, and its height adjustment sensitivity is poor, the market share is very low, pneumatic lifting chair has the advantages of low price, simple structure, flexible operation, well received by consumers and sought after, more than 80% offices, enterprises, companies use pneumatic lifting chair. Lifting chair features 1 lift chair seat board can be carried out a certain range of lift, to a large extent, can meet the use of different height. 2 positioning device on the lifting chair, can be positioned at different heights, so that the use of the process is more safe and stable. 3 lift chair seat board can be freely adjusted angle, to read, study, writing, painting, design, and other different needs. 4 lift chairs in the fall only need to sit directly, to the lifting of a certain pressure, hold down the elevator shaft so that it can be a gentle decline. Chair lift - down method on the market more common chair lift pressure type, spiral type, lift chair in the use process according to the differences in styles type, material and structure, the chair lift decreased differently. 1. Pneumatic lift chair is a chair, the device has a cylinder, cylinder piston rod to move up and down control swivel chair lifts. Pressure rod filling with nitrogen, but if gas purity below 90% chair lift and possible security risks in the use of the process, the pressure rod Mifengbuyan will lead to gas flaring, (and be sure to buy qualified chairlift). When the lifting chair falls, the person needs to sit on the chair and then lift up the lower part of the control lever, and the weight of the body can be easily realized by using the weight of the body. 2 free air spring lift chair: in the structure is relatively simple by the airtight cylinder, cylinder, piston, extended to the outside of the piston rod. The air pressure in the cylinder is much larger than that of the outside, and the piston on both sides of the cylinder is connected with a small hole. According to the middle school physics knowledge, to press the piston rod, resistance is constant. At this time, only the control rod can be moved up and down can be easily realized on the lifting of the chair up and down. Recommend reading: negotiate chair folding chair leather chair computer chair desk chairs offer