Locks – Operating mechanism – Key
Patent
1980-10-20
1983-02-08
Wolfe, Robert L.
Locks
Operating mechanism
Key
E05B 2500
Patent
active
043721397
ABSTRACT:
A lock in which a replaceable control shaft adjusts a moveable shaft in the main cylinder to different predetermined levels. By adjusting the moveable shaft a new shear line is created between the key pin housed in the shaft and the spring loaded pin tumbler housed in a separate moveable shaft embodied in the lock housing. When a new shear line has been created a new predetermined key will become operable while the prior key, unless it is a master key, becomes inoperable.
A special key when rotated causes a cylinder to rotate creating a cavity in the lock allowing access to the control shaft through the facing of the lock. The control shaft has a spring that compresses upon adjustment securing a nodule on the control shaft into one of several cavity slots. The control shaft has teeth that mesh into the adjustable moveable shaft. The teeth may or may not cause the moveable shaft to change position upon the rotation of the control shaft.
The bridging device connects the main cylinder and the sloped upper portion of the adjustable moveable shaft. This bridge slides under and raises the upper moveable shaft into an aligning position with the adjustable moveable shaft thereby preventing jamming when the main cylinder is returned to its original position.
REFERENCES:
patent: 2266163 (1941-12-01), Ching
patent: 2603081 (1952-07-01), Pelle
patent: 2970466 (1961-02-01), Wellekens
patent: 3151476 (1964-10-01), Wellekens
patent: 3167944 (1965-02-01), Pickering
patent: 4142391 (1979-03-01), Paig
Literature-Kwikset Division, Emhart Corp., Anaheim, Calif., 1967.
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