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US 4,637,237 AGranted
Door locking system
AssigneeSimplex Security Systems, Inc.
InventorsEdward J. Witkoski, Edgar G. Lizotte
Life of this patent
Estimating the term…
Abstract
A combination lock system on a narrow stile door having selective operation through a drive mechanism including a slide for retraction of the latch bolt operated by the combination lock and a manual control or key operation of the latch bolt. The key operation provides an override of the combination lock operation.
Claims20
A door locking means comprising:
- a door;
- a combination lock on said door;
- a latch bolt on said door, means normally biasing said latch bolt to an extended latched position,
- a latch release for retracting the latch bolt against the biasing force to a retracted position;
- a mechanism including a member mounted on said door means normally biasing said member to a retracted position connected with said latch release, said mechanism including interposer means selectively and alternatively interrupting and transmitting control through the combination lock or key lock control;
- a combination lock control;
- a manual latch control operator connected to said combination lock control for selectively and alternatively operating said mechanism and said door latch release for unlatching said latch bolt;
- and
- a key operated lock control for selectively and alternatively operating said mechanism and said latch release to unlatch said latch bolt.
6 more elements
A door locking means comprising:
- a door;
- a combination door locking control on said door;
- a key operated door locking control on said door;
- a latch bolt in said door normally biased to a extended latched position;
- a manually operated door unlocking member;
- a linkage connected between said manually operated door locking member and said combination locking control,
- said combination locking control preventing normal movement of said linkage when said combination lock is in the locked position;
- a slide mechanism mounted on said door, means biasing said mechanism to a return position, interposer means selectively and alternatively directing operation of said slide mechanism by said linkage and combination locking control and said key control;
- a latch release connected between said slide mechanism and said latch bolt to bias said latch bolt to a retracted position responsive to operation of said slide mechanism,
- said interposer means controlling operation of said slide mechanism selectively and alternatively responsive to decoding of said combination lock, and operation of said manually operated door unlocking member and operation of said key control responsive to a key.
7 more elements
A door locking means comprising:
- a door;
- a spring biased latch bolt normally biased to an extended latched position;
- a combination lock control connected to said latch bolt for selectively and alternatively retracting said latch bolt when said combination lock is decoded;
- a key operated lock control connected to said latch bolt for selectively and alternatively retracting said latch bolt;
- interposer means selectively and alternatively directing operation of said latch bolt by said combination lock control and said key operated lock control,
- said key operated lock control including means for overriding operation and locking out operation by said combination lock control.
3 more elements
Dependencies are inferred from the claim text.