Key lock with transfer tumblers and master keying

Details Key lock with transfer tumblers and master keying Key lock with transfer tumblers and master keying

1989-01-05

1990-10-09

Wolfe, Robert L.

Locks

Operating mechanism

Key

70419, E05B 2902

Patent

active

049613332

ABSTRACT:
This specification describes an improved lock of the type described in my U.S. Pat. No. 4,796,447, granted Jan. 10, 1989. In locks of that type, a key is inserted into a key-cylinder and then the key sets a series of transfer tumblers that, in turn, set a series of lock opening elements. As the key-cylinder is rotated, the transfer tumblers are moved out of contact with the elements. Only at this time can the lock be opened, provided that the elements had been set correctly. The improvement in this specification permits the lock to be opened by more than one key. In other words, this lock permits "master-keying".

REFERENCES:
patent: 2023847 (1935-12-01), Liss
patent: 3722240 (1973-03-01), Spain
patent: 4356713 (1982-11-01), Widen
patent: 4393673 (1983-07-01), Widen
patent: 4637234 (1987-01-01), Mielonen
patent: 4796447 (1989-01-01), Rabinow

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