Safe deposit lock construction with changeable tumbler mechanism

Details Safe deposit lock construction with changeable tumbler mechanism Safe deposit lock construction with changeable tumbler mechanism

1975-01-08

1976-09-07

Wolfe, Robert L.

Locks

Operating mechanism

Key

70355, 70384, E05B 2500

Patent

active

039787001

ABSTRACT:
A lock construction for a safe deposit box requires two keys for operation of the bolt. The first key is provided by the vault guard and the second key is provided by the customer. Each key activates a separate set of wafer-like tumblers by rotating the tumblers in response to rotation of the key. Each set of tumblers includes a plurality of key engaging drive tumblers which are gear engaged with gate tumblers. Appropriate rotation of the keys orients a notch of the gate tumblers that permits withdrawal of the bolt. Stops are provided on the bolt cooperative with key operated shifters to insure sequential operation of the keys. A change key tool may be inserted from the back side of the lock to disengage the drive and gate tumblers. Subsequent to disengagement of the tumblers, it is possible to substitute one or both of the keys and thus change the relative gear engagement of the tumblers. Unique features of the security lock include the tumbler drive mechanism, the key combination change mechanism and the stop arrangement that insures sequential operation of the keys.

REFERENCES:
patent: 1259353 (1918-03-01), Brintnall
patent: 1431381 (1922-10-01), Diesel
patent: 1543447 (1925-06-01), Marvel
patent: 2524696 (1950-10-01), Ellis
patent: 3514982 (1970-06-01), Bergendahl
patent: 3772904 (1973-11-01), Parrock
patent: 3837196 (1974-09-01), Gartner

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