Locks – Operating mechanism – Combination
Patent
1975-08-22
1976-08-31
Frazier, Roy D.
Locks
Operating mechanism
Combination
70314, 70315, 70333R, E05B 3712, E05B 3716
Patent
active
039772225
ABSTRACT:
An improvement in a locking device of the type having a series of reference combinations arranged serially upon a tape. A combination is entered into the system by a set of push buttons. The combination entered is compared with the reference combination. If both combinations are complementary, the system can be unlocked. The improvement prevents the unauthorized ascertainment of the combination needed to release the device. An isolation or restraining bar acts as a buffer between an internal gate and a set of tumbler levers. When an actuator knob is turned to unlock the system, the tumbler levers normally will engage with the gate when the combination push buttons are not set to the proper combination. The combination then becomes ascertainable, because the tumbler levers that require actuation, transmit movement to the push buttons when contacted by the gate. The isolation or restraining bar prevents the gate from engaging with the tumbler bars, thus preventing unauthorized ascertainment of the combination required to release the locking device.
REFERENCES:
patent: 2706393 (1955-04-01), Jamieson et al.
patent: 2967419 (1961-01-01), Katona
patent: 3115028 (1963-12-01), Windle
patent: 3664231 (1972-05-01), Hanson
patent: 3869885 (1975-03-01), Uthenwoldt
Kresan Lawrence J.
Luperti Harry E.
Frazier Roy D.
Holko Thomas J.
Pitney-Bowes Inc.
Salzman Robert S.
Scribner Albert W.
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