Dead bolt combination lock with integrated re-locking features

Details Dead bolt combination lock with integrated re-locking features Dead bolt combination lock with integrated re-locking features

1998-04-27

2000-08-01

Barrett, Suzanne Dino

Locks

Operating mechanism

Using a powered device

70416, 70333R, E05B 4900

Patent

active

06094952&

ABSTRACT:
A dead bolt lock automatically blocks the extended bolt to prevent externally-applied force from thrusting the bolt back into the lock case, and in the event of physical attack the lock responds by prolonging or perpetuating the dead bolt blocking condition. A push-pull lock has a bolt whose motion in both directions is stopped in response to detection of a rise in motor current above a certain level: a cushioning arrangement allows the current-limiting feature to be implemented without risk of damage to the motor, gear teeth or other drive components. A re-locker arrangement includes an angled flange that is part of a motor-supporting bracket; when forcibly pressed, the flange breaks plastic pins to release a spring-biased re-locker wire to block the bolt from being withdrawn, and when the wire is in the dead bolting position an extension of the re-locker wire engages a ridge in the lock's case to prevent the re-locker from being manipulated back to its original position. Either lock can control the position of a bolt works blocking element that selectively engages a lever-driven mechanism that blocks and unblocks the door from being opened. A sensor switch, especially for use on the push-pull lock, tells the lock when the mechanism is in a secured position, so that the lock is automatically re-locked and the user does not have to manually extend the bolt. Finally, the system has a keypad tampering detection and response system, remote enable/disable unit, duress detection and response unit, low-battery sensing arrangement, bolt extension indication feature, adjustable bolt throw feature, and audit trail feature.

REFERENCES:
patent: 4926664 (1990-05-01), Gartner et al.
patent: 5020345 (1991-06-01), Gartner et al.
patent: 5033282 (1991-07-01), Gartner et al.
patent: 5473922 (1995-12-01), Bair et al.
patent: 5640862 (1997-06-01), Remenicky
patent: 5709114 (1998-01-01), Dawson et al.
patent: 5845523 (1998-12-01), Butterweck et al.
patent: 5881589 (1999-03-01), Clark et al.

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