Combination lock with arrangement for defeating automatic dialer

Details Combination lock with arrangement for defeating automatic dialer Combination lock with arrangement for defeating automatic dialer

1994-06-07

1995-12-12

Boucher, Darnell M.

Locks

Operating mechanism

Combination

70295, 70332, 70444, 292DIG22, E05B 1500

Patent

active

054739217

ABSTRACT:
A circular rotating member, having an outer peripheral surface, is rotatably mounted in a ring member. The rotating member includes an elongated central slot and four peripheral slots extending inwardly from the peripheral surface of the rotating member and spaced at 90 degrees from each other. The key of the combination lock extends into the central elongated slot, and a ball bearing is carried in each of the peripheral slots of the rotating member. The inner surface of the ring member is substantially identical to the outer peripheral surface of the rotating member but the inner surface of the ring member includes, additionally, two cut-outs. Thus, when the ring member is driven to rotate at a high speed by an automatic dialer, the ball bearing will be driven by centrifugal force into the cut-out whereby to prevent further rotation of the dial to thereby block the lock.

REFERENCES:
patent: 2308382 (1943-01-01), McDermott
patent: 2408670 (1946-10-01), McDermott
patent: 3104538 (1963-09-01), Roberts et al.
patent: 3699789 (1972-10-01), Potzick
patent: 3980161 (1976-09-01), Mauldin
patent: 4142388 (1979-03-01), Phillips et al.
patent: 4831851 (1989-05-01), Larson
patent: 4904984 (1990-02-01), Gartner et al.
patent: 5061923 (1991-10-01), Miller et al.
patent: 5257520 (1993-11-01), Miller
patent: 5305695 (1994-04-01), Lichter
patent: 5343723 (1994-09-01), Miller et al.

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