| 摘要 |
PCT No. PCT/DE96/02350 Sec. 371 Date Nov. 25, 1997 Sec. 102(e) Date Nov. 25, 1997 PCT Filed Dec. 7, 1996 PCT Pub. No. WO97/24958 PCT Pub. Date Jul. 17, 1997The invention concerns the height-adjustment of the back-rests of chairs, especially office chairs, consisting of a housing (1) in which a flat back-rest carrier (2) is held by a ball-stop clamp (3, 4), the back-rest carrier (2) being provided with a series of indentations or holes (3) arranged behind one another in an axial direction for the stop balls (4) which are held in the indentations or holes (3) by means of a spring-loaded clamping bevel (5'). The clamping bevel (5') can be brought out of contact by a push-button (8) guided sideways from outside the housing against the spring force, spring-loaded means (10, 11) being arranged in the housing (1) for the prevention of sideways play of the back-rest carrier (2).
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