Locks – Operating mechanism – Key
Patent
1989-08-07
1991-03-19
Gall, Lloyd A.
Locks
Operating mechanism
Key
70341, 70375, 70383, 70389, 70493, E05B 1100, E05B 3510
Patent
active
050000195
ABSTRACT:
The cylinder lock of the present disclosure includes a cylinder housing having either two or three rows of cylinder holes therein. The cylinder holes are in communication with an elongated cylindrical bore in which is inserted a cylindrical plug having a single row of plug holes. The plug can be rotated to each of the two or three rows of cylinder holes in order to permit the exchange of various pins within the cylinder holes and thereby permit the recording of the lock. One modification of the invention utilizes a notch adjacent one of the plug holes for permitting the key to rotate in one direction, but for preventing the key from rotating in another direction. A further modification utilizes an enlarged pin in one of the rows of cylinder holes so as to permit an access key to unlock the lock once, but preventing the access key from unlocking the lock a second time.
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patent: 4185480 (1980-01-01), Pechner
patent: 4631941 (1986-12-01), Sjunnesson
patent: 4732023 (1988-03-01), Shen
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