Chen T Hsu

US Patent:

59411074, Aug 24, 1999

Filed:

Jul 7, 1998

Appl. No.:

9/111227

Inventors:

Chen Yun Hsu - Whitestone NY

International Classification:

E05B 4706

US Classification:

702783

Abstract:

The present invention relates to an electronic lock having first and second disposed in axial alignment is provided. A first key inserted into the cylinders of the electronic lock sends an electronic signal to a solenoid which retracts a stopper from engagement with a latch plate upon turning the first key through an initial angle. Thereafter, the first key drives the first cylinder to drive a first cam which moves against a first cam follower to move the latch plate and withdraw the latch from locking engagement. In the event of an electronics failure and/or in order to manually override the electronics, a second key is inserted into the axially aligned cylinders. The second key initially drives the second cylinder to move a second cam against a second cam follower that bears against the stopper to remove the stopper from engagement with the latch plate. Thereafter, continued movement of the second key allows for engagement of the second key with the first cylinder to move the first cylinder and the first cam attached thereto to contact the first cam follower associated with the latch plate to withdraw the latch plate into the lock housing to unlock the lock.