Abstract: 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).