Locks – Special application – For closures
Patent
1994-06-23
1997-09-16
Boucher, Darnell M.
Locks
Special application
For closures
70417, 70467, 70468, 292335, 292165, 292167, G05B 6506
Patent
active
056668309
ABSTRACT:
A security lock having a main locking bolt connected to a U-shaped tail member slidably mounted in a housing secured to the door. The U-shaped tail member has an upper branch engaged by a turnable driving arm for movement between a retracted unlocked position for the main bolt and an extended locked position therefor. A spring biasses the driving arm to move the U-shaped tail member to the extended locked position. A key cylinder and an interior handle are connected to the driving arm to turn the arm and unlock the bolt. A spring-loaded latch is biassed to engage the lower branch of the U-shaped tail member in the retracted unlocked position. In the closed position of the door, the latch releases the U-shaped tail member which, under the action of the spring, drives the main bolt to its locked position. The latch can be operated when the door is open to release the U-shaped tail member so the main bolt extends from the lock. A first security member at the inside of the door prevents opening of the door by the interior handle unless released. A second security member at the inside of the door prevents opening of the lock by the key.
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Boucher Darnell M.
Sanchelima J.
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