Security device for a dead bolt lock

Closure fasteners – Bolt guards

Patent

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Details

292340, 70418, E05B 1700

Patent

active

057046662

ABSTRACT:
The security device is suitable for use with any conventional dead bolt lock mounted on a door. It comprises a plate shaped to extend flat on the outer lateral surface of the doorframe. A security lever is mounted on the security device and is pivotable about a vertical axis adjacent to the plate. The security lever includes an inner arm extending on one side of the plate in the cavity of the doorframe in a position such that the dead bolt, in a lock position, abuts on the inner arm and causes the lever to pivot around its axis. The lever further includes an outer arm extending on another side of the plate shaped and sized to extend on the door behind the dead bolt, when the dead bolt has been brought to a lock position and has caused the lever to pivot around its axis. With a security device according to the present invention, the locking of the dead bolt lock is performed in only one step by simply engaging the door lock, thereby engaging the security device simultaneously.

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patent: 4865370 (1989-09-01), Francis

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