Locks – Operating mechanism – Key
Patent
1989-09-29
1990-09-04
Wolfe, Robert L.
Locks
Operating mechanism
Key
70377, E05B 2906
Patent
active
049534203
ABSTRACT:
A low keylock unit includes an electrical switch unit. A pair of laterally spaced locking levers are pivotally mounted within a rotatable lock tube. The tube extends inwardly into a contact carrier rotatably mounted at the inner end of the switch housing for selective rotation thereof. A rotating switch is coupled to the carrier and selectively engages a fixed contact on a back plate closing the housing. Each lever includes a control leg between a key opening and the pivot and a lock leg between the pivot and the switch unit. A resilient element such as a coil spring compressed between the lock legs or an integral cross between the levers, bears the levers with the lock legs engaging locking grooves on the housing wall to prevent rotation of the tube and the switch unit. A flat key inserted into the lock deflects the legs and pivots the levers outwardly to release the lock legs. If the key is too wide, the control legs move outwardly into the grooves and maintain the locked state. An appropriate key has a final position which partially deflects the control legs within the tube and deflects the lock legs within the tube and thereby positions all legs in a release position within the tube. The control legs and the key are shown with mating truncated edge projections on the control legs and recesses on the key to set the release position and resiliently holds the key within the lock.
REFERENCES:
patent: 1168701 (1916-01-01), Babbitt
patent: 1360622 (1920-11-01), Crouch
patent: 1564883 (1925-12-01), Muzzio
patent: 1653511 (1927-12-01), Schlage
patent: 3404548 (1968-10-01), Keffer
patent: 3787812 (1974-01-01), Armstrong
patent: 4016379 (1977-04-01), Merkle
patent: 4196606 (1980-04-01), Guiraud
Handy Allen L.
Krubsack Larry J.
Lawton John G.
Clum Manufacturing Company, Inc.
Wolfe Robert L.
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