Lock with facility for preventing unauthorized entry
AssigneeDOM-Sicherheitstechnik GmbH & Co. KG
InventorGiselher Sieg
Life of this patent
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Abstract
The invention provides a lock with a forward and reverse action bolt element and a lock cylinder which precedes the operating region of the bolt element into which the force for shifting the bolt element is to be introduced. The lock comprises an arresting element which can be fused at least locally by the effect of heat on the lock cylinder and which, after fusion, arrests the bolt element against reverse lock actuation. In an alternative embodiment, the lock may comprise a coupling between the operating region and a lock-actuating element spatially separated from it and protected by the lock cylinder, which coupling can be broken by fusion due to the effect of heat on the lock cylinder.
Claims11
A lock with facility for preventing unauthorised entry, which comprises:
- a lock cylinder removably mounted within a door;
- a bolt element attached to the door for movement relative thereto;
- moving means for moving the bolt element;
- the moving means located adjacent the lock cylinder and concealed thereby;
- the lock cylinder being normally operable to facilitate removal of the lock cylinder from the door to expose the moving means;
- an actuating element for facilitating selective operation of the moving means to move the bolt element subsequent to removal of the lock cylinder from the door;
- fusible means for operatively connecting the moving means to the bolt element at temperatures below a prescribed temperature and for rendering the bolt element inoperable by the moving means at temperatures at or above the prescribed temperature.
Dependencies are inferred from the claim text.