Lock assembly

Details Lock assembly Lock assembly

1980-12-08

1983-12-27

Wolfe, Robert L.

Locks

Special application

For closures

70219, 70288, 70312, 70328, 292359, 200 6164, 70DIG49, E05B 1510, E05B 1514, E05B 3712, E05B 6506

Patent

active

044223129

ABSTRACT:
A lock assembly incorporating an exterior knob assembly which is axially movable into engagement with a latchbolt. The knob assembly includes a shaft having a circumferential groove into which a plurality of locking pins extend. The position of the locking pins is controlled by means of a number of combination knobs, and normally one or more of the locking pins is positioned within the circumferential groove to prevent axial movement of the exterior knob assembly. When the proper combination is chosen, the locking pins will be out of engagement with the groove, thereby allowing the exterior knob assembly to be moved into engagement with the latchbolt. The latch bolt can also be actuated by means of an interior knob assembly. The interior knob assembly is movable into a position which prevents engagement of the exterior knob assembly with the latchbolt despite the fact that the locking pins are all retracted from the circumferential groove. Means are included for controlling the frictional force required to turn the combination knobs to thereby reduce the chance of detection of the combination of the assembly. In addition, electric switches may be included adjacent the eccentric cylinders in order to detect tampering with the device.

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patent: 1968285 (1934-07-01), Egan
patent: 2494575 (1950-01-01), O'Brien
patent: 2558619 (1951-06-01), Lehman
patent: 2874240 (1959-02-01), Ricks
patent: 3937503 (1976-02-01), Harris
patent: 4262506 (1981-04-01), Tobel

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