Back to results
US 4,831,851 AGranted
Combination/electronic lock system
AssigneeSupra Products, Inc.
InventorWayne F. Larson
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSupra Products, Inc.
InventorWayne F. Larson
Estimating the term…
A lock mechanism having a mechanical combination lock and an electronic lock, wherein the mechanical combination lock serves for effecting a fail safe entry in case of failure of the electronic lock. More specifically, the lock mechanism includes a mechanical combination lock having a bolt-retracting linkage which is tripped by inward movement of a dial into a first operative relationship with a driver on the drive spindle. An electronic latch prevents bolt retraction by this bolt-retracting linkage when in the first operative positive until the electronic latch has been operated. However, when the tumblers of the lock have been aligned and a gate bar enters the tumblers, the bolt-retraction linkage is caused to assume a second operative relationship with the driver so as to permit bolt retraction despite the latching effect of the electronic lock.
A lock mechanism comprising:
A fail safe lock system comprising:
In a mechanical combination lock having components that can assume first and second positions, the components in the first position acting to lock the lock and the components in the second position acting to unlock the lock, the components being positionable in their second position by operating the combination lock to enter an unlocking combination, an improvement comprising:
In a lock having lock housing, a retractable bolt, a drive cam having an engagement feature to which a lever member can couple, a knob coupled to the drive cam by a spindle, and a lever member pivotally mounted to the bolt and movable in an arc from a first position to a second position in which it can engage with the engagement feature on the drive cam to thereby couple the bolt to the drive cam, said coupling permitting the bolt to be retracted by rotation of the drive cam by the knob, an improvement comprising:
Dependencies are inferred from the claim text.