High security pin tumbler lock

Details High security pin tumbler lock High security pin tumbler lock

1987-01-16

1988-01-05

Wolfe, Robert L.

Locks

Operating mechanism

Key

70378, E05B 2708

Patent

active

047167491

ABSTRACT:
An improved, highly pick-resistant tumbler lock construction incorporates annular undercut portions on both the rotating spindle and the tumbler sleeve of the lock. The undercut portions define discontinuities along the axial bores of the spindle and the tumbler sleeve so as to provide the false feel of a shear plane when the driver pins are used to manipulate the tumbler pins in order to pick or decode the lock. Several of the driver pins and the tumbler pins are also provided with annular grooves which, in combination with the undercuts on the spindle and tumbler sleeve, accentuate the false feel effect in such a way that the false feel of the shear plane is provided at differently inwardly extending positions of the pins, thereby making it extremely difficult to determine when a particular tumbler pin has been precisely positioned at the shear plane.

REFERENCES:
patent: 2202329 (1940-05-01), Braune
patent: 2283489 (1942-05-01), Crousore
patent: 2629249 (1953-02-01), Mendelsohn
patent: 3681955 (1972-08-01), Sturgeon
patent: 4041739 (1977-08-01), Mercurio
patent: 4546629 (1985-10-01), Hwang

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