| 摘要 |
<p>A combination lock 10 comprises a housing 11 defining a mounting face 12, a locking mechanism 21 accommodated in the housing 11 and a cancelling device that is accessible at an external location of the housing. A set of operating elements 25 with buttons 26 are accessible at the front of the housing and are actuable, such as by axial displacement, to operate the locking mechanism 21. The locking mechanism 21 can be changed from a locking state to a release state in response to actuation of, and only of, a selected group of the operating elements 25. These elements can additionally be manipulated, in particular rotated, to select the group. The lock further comprises a blocking plate device, such as a slideable plate, 31 blocking the rotation of the operating elements 25. The cancelling device may cancel the blocking of the plate and may include a key barrel 37 accessible for operation externally of the housing 11 at a place, in particular the front of the housing, separate from the mounting face. Operation of the key barrel 37 thus has the consequence of freeing the buttons 26 for rotation to change the code.</p> |
