Security door replacement

Details Security door replacement Security door replacement

1997-04-29

1998-08-18

Gall, Lloyd A.

Locks

Special application

For closures

292 34, 292 37, 292 39, 292170, 292182, E05B 6314

Patent

active

057944679

ABSTRACT:
A security door replacement for increasing the security of homes or other structures includes a security door locking mechanism having a piston centrally located parallel to a longitudinal axis of the door. The piston has wedge shaped components on either end which interact with four locking arms. The security door replacement also includes a pinion gear connected to the door's doorknob which interacts with a rack gear integral to the central piston such that turning the doorknob causes the pinion gear to turn resulting in movement of the piston. This piston movement causes the locking arms to alternatively extend through and withdraw from the door frame and supporting structure thereby locking and unlocking the door.

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patent: 5067755 (1991-11-01), James
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