| 摘要 |
An office chair is provided. The office chair includes a seat back that can follow the motions of the upper body of a person seated in the seat. The seat back of the office chair includes a restoring spring in the form of a mechanical screw pressure spring. A piston is coaxially disposed in the screw pressure spring. The piston inserts in a piston sleeve, whereby the piston has locking pieces that can be extended radially to the outside, which are placed on the peripheral edge of the piston sleeve in the hooked-out state and in a largely extended position of the piston.
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