| 摘要 |
A table (11) can be stopped in a vertical movement with respect to a fixed guide (15) by selectively engaging an engagement and locking element (21) in form of a angled lever having a control arm (33) and a stopping and locking arm (31) with adjustment and stop elements (19) secured on the vertically extending second part (15). Upon movement from a predetermined position, the control arm (33) is engaged in a guide track (51) of the engagement and locking element, permitting unlimited movement in a direction away from an adjustment and stopping shoulder (37) on the abutment and stop element. Upon reverse direction, however, the control arm engages a first can (47) which moves the locking arm (31) against the abutment shoulder (37). To release the locking arm from the abutment shoulder, it is only necessary to make a short movement counter the locking direction which will engage the control arm in a second cam to release the lock, and the guide track (51) then guides the locking arm of the engagement and locking element clear of the adjustment and stopping shoulder upon again reversing direction of movement.
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