| 摘要 |
<p>A lock includes a locking element (4) and a control element (35) rotated to-and-fro by a drive (34) to shift the locking element (4) to-and-fro by means of a drive element (10) between a locked and an unlocked position. The drive element (10) and the control element (35) cooperate in such manner by means of a cross-pin (41) axially displaceable in a cross-borehole (42) of the inner drive element (10) and two helically running inner grooves (43, 44) and two adjoining coplanar intermediate surfaces (45, 46) and two subsequent coplanar end faces (47, 48) of the outer control element (35) which extend perpendicularly to the control element's axis of rotation (8) and which are bounded by two sidewalls (49, 50) that the drive element (10)-when the control element (35) is rotated in the direction wherein the cross-pin (41) runs in the grooves (43, 44) toward the intermediate surfaces (45, 46) and then on two bevels (52, 53) toward the end faces (47, 48)-is correspondingly axially displaced in order that, following the transition of the cross-pin (41) onto the end faces (47, 48), the drive element (10) shall essentially be stationary and remain in the axial position it has reached until the control element (35) is rotated in the opposite direction and the cross-pin (41) runs on the bevels (52, 53) away from the end faces (47, 48) and in the grooves (43, 44) away from the intermediate surfaces (45, 46), so that the drive element (10) shifts in the opposite direction. While the cross-pin (47) runs on the bevels (52, 53) from the intermediate surfaces (45, 46) to the end faces (47, 48), the drive element (10) may act on a switch (59) to generate a signal indicating the locking element's position.</p> |
