Locks – Operating mechanism – Using a powered device
Patent
1975-12-05
1977-05-31
Wolfe, Robert L.
Locks
Operating mechanism
Using a powered device
70364A, 70413, E05B 2704, E05B 4700
Patent
active
040261344
ABSTRACT:
A magnetic lock having an outer shell with a cylindrical bore therein and a cylindrical plug rotatably mounted in the bore for movement between locked and unlocked positions. The annular plane between the plug and the inner bore surface define a shear plane for the lock. The plug is provided with a longitudinally extending keyway and a plurality of radially extending longitudinally spaced apart passages which communicate with the shear plane but not with the keyway. The shell is provided with a like plurality of passages which align with the plug passages when the plug is in locked position. Disposed within each of the plug passages is a magnetic pin tumbler of length that is less than the length of the plug passages. Drivers are provided which extend from the upper ends of the magnetic pin tumblers to a point within the aligned shell passage to bridge the shear plane and hold the lock in locked position. Means are provided for biasing the magnetic pin tumblers and drivers toward the keyway, which biasing means preferably exert different biasing forces. The key for opening the lock is provided with a shank that is slidably disposable within the keyway. Mounted on the key shank are a plurality of magnets, one for each pin tumbler magnet and poled to repel said pin tumbler magnets and drivers with a force that will be equal and opposite to the force of the biasing means when the confronting ends of the drivers and pin tumblers are in the shear plane, whereby to unlock the lock.
REFERENCES:
patent: 2966789 (1961-01-01), Hall
patent: 3270538 (1966-09-01), Kerr
patent: 3494157 (1970-02-01), Coker
patent: 3518855 (1970-07-01), Wake
patent: 3665740 (1972-05-01), Taniyama
patent: 3782147 (1974-01-01), Hallmann
patent: 3837195 (1974-09-01), Pelto
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