| 摘要 |
A lock comprises a housing defining a mounting face, a locking mechanism accommodated in the housing and operable to change between a locking state and a release state and a set of operating elements with buttons accessible at the front of the housing and actuable, such as by axial displacement, to operate the locking mechanism. The locking mechanism can be changed from the locking state to the release state in response to actuation of, and only of, a selected group of the operating elements. These elements can additionally be manipulated, in particular rotated, to select the group. The buttons of the selected group can be identified by respectively associated digits forming a code. The lock further comprises a slidable blocking plate blocking the rotation of the operating elements and cancelling means operable to cancel the blocking by the plate. The cancelling means includes a key barrel accessible for operation externally of the housing at a place, in particular the front of the housing, separate from the mounting face. Operation of the key barrel thus has the consequence of freeing the buttons for rotation to change the code. |
