Locks – Operating mechanism – Key
Patent
1980-12-01
1983-03-15
Wolfe, Robert L.
Locks
Operating mechanism
Key
70340, 70343, 70383, 70384, 70364R, 70377, E05B 2500, E05B 2904, E05B 3508, E05B 3510
Patent
active
043763820
ABSTRACT:
A resettable single-barrel single-plug cylindrical two section lock assembly is provided wherever master keying is required. The lock of the invention is intended to be operated and reset by three different keys. One key (#1 key) is used to turn the lock to a position in which it may be reset by either of the other two keys. One of the other two keys (#2 key) operates a first section of the dual lock; and the other of the other of the two keys (#3 key) operates a second section of the lock which is independent of the first section. Either section may be reset by inserting the existing #2 or #3 key into the lock once the lock has been turned by the (#1) key to a predetermined position, and then turning the lock to the reset position, and after the existing key has been withdrawn, turning the lock back to its normal operating position by the new key, either the #2 or #3 keys, depending upon which section of the lock is being re-keyed.
REFERENCES:
patent: 3990282 (1976-11-01), Sorum
patent: 3999413 (1976-12-01), Raymond
patent: 4069694 (1978-01-01), Raymond
patent: 4320639 (1982-03-01), Kleefeldt
Millett James A.
Raymond James W.
Beecher Keith D.
Raymond James W.
Wolfe Robert L.
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