Combination lock

Details Combination lock Combination lock

1991-11-21

1993-12-07

Cuomo, Peter M.

Locks

Operating mechanism

Combination

70316, 70333R, 70302, 70DIG52, 70 63, E05B 3704

Patent

active

052674606

ABSTRACT:
A combination lock for a key safe has an over-center spring for biasing a unitary bolt in an extended or retracted position. A switch for actuating the bolt has a break-away button to foil vandals. The bolt includes checkers for engaging notches in a plurality of programmable combination rings when the combination is properly dialed. The checkers have V-shaped ridges for engaging false notches formed in the combination rings, making the lock pick-resistant. The checkers also include flat shoulders to prevent the bolt from being forcibly wedged into the combination rings to open the lock. The combination must be properly dialed to permit the bolt to be retracted for closing the key safe.

REFERENCES:
patent: 907038 (1908-12-01), Greene
patent: 929712 (1909-08-01), Runkle
patent: 1308521 (1919-07-01), Butter
patent: 1472577 (1923-10-01), Baer
patent: 1600338 (1926-09-01), Jones
patent: 3798936 (1974-03-01), Oliver
patent: 3800576 (1974-04-01), Barrett et al.
patent: 4106801 (1978-08-01), DeLima Castro Neto
patent: 4626007 (1986-12-01), Larson
patent: 4803859 (1989-02-01), Miller et al.
patent: 4901546 (1990-02-01), Uyeda et al.

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