Relocking mechanism
AssigneeKaba Mas Corporation
InventorsGreg Dehaven, Kenneth H. Mimlitch, Edward Pollard
Life of this patent
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Abstract
A relocking mechanism that blocks the path of a bolt within a lock assembly is presented. The relocking mechanism comprises a breakaway member that is repositioned when the lock assembly is attacked by some mechanical means, such as impact applied via a hammer and punch to the lock housing through a spindle hole in a door. The breakaway member prior to attack holds a preloaded relocking plunger clear from bolt movement. When the breakaway member is repositioned upon attack, the plunger is free to move under a biasing force into position so as to block the bolt thus keeping the lock in a secure locked state regardless of the state of the locks default blocking mechanism.
Claims20
A swing bolt lock comprising a swing bolt mounted in a housing adapted to be mounted to a door having a spindle hole defined therethrough, the swing bolt being pivotable between a locking and an unlocking position, a blocker movably mounted in said housing towards and away from the swing bolt for selectively blocking or allowing rotation of the swing bolt during normal operation, and a relocking mechanism for automatically locking the swing bolt in a secure locked state when the lock is subject to a physical attack, the relocking mechanism comprising a first member connected in force transmission relationship to the housing such that externally-applied forces against the housing through the spindle hole of the door are transmitted to the first member, and a second member having an abutting surface for engagement with the swing bolt, the abutting surface of the second member physically blocking the swing bolt from moving to the unlocking position when the first member is moved from an initial default position to an operational position under the externally-applied forces.
A relocking mechanism for automatically locking a lock in a secure locked state when subject to a physical attack, the lock having a housing mounted to a door defining a spindle hole, the lock having a bolt moveable between a locking and an unlocking position;
- the relocking mechanism comprising:
- a plunger normally held in a retracted position by a breakaway member disposed to receive the force of an impact attack through the spindle hole of the door, the force of the impact attack causing the breakaway member to release the plunger which is then free to move under the action of a biasing member to an extended position in which the plunger physically blocks the movement of the bolt to the unlocking position.
Dependencies are inferred from the claim text.