Importance

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Abstract

A screw spindle of a swivel chair according to the present invention comprises a spindle which is placed in an outer case; an elastic body which is placed in the spindle; a bearing support which is placed in the spindle; a ball bearing component which is placed in the spindle; a screw nut and a clutch, each having a corresponding furrow and ridge with curved surfaces, which are placed in the spindle; a screw shaft which is placed in the spindle; a fixer and a clip which hold the screw shaft in place; and a stopper which is formed at the screw shaft and limits the height of the seat; a spindle bushing located between the screw shaft and the elastic body. The screw shaft further includes an idling protection component and a fixing end, and the fixer includes an idling protection hole corresponding to the idling protection component. The screw spindle of the present invention has the following advantages. There is no shock and noise because the clutch and the screw nut have curved furrows and ridges; there is no noise resulting from trembling of the elastic body because the spindle bushing guides the elastic body to move up and down in a precise vertical direction; disassembling of the screw spindle is easy for repairing or replacing the ball bearing component because the stopper has a smaller diameter than the screw shaft; no welding equipment is required to assemble the screw spindle, resulting in the reduction of the manufacturing costs and tidiness of the work place, because the screw shaft is fixed to the fixer by using the clip.

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First Claim