Pin tumbler lock with anti-impressioning feature

Details Pin tumbler lock with anti-impressioning feature Pin tumbler lock with anti-impressioning feature

1976-09-24

1978-03-14

Wolfe, Robert L.

Locks

Operating mechanism

Key

70378, 70373, 70419, E05B 904, E05B 1514

Patent

active

040784061

ABSTRACT:
A pin tumbler cylinder lock having a plug eccentrically positioned within a cylindrical bore of a housing. Surrounding the plug are longitudinally aligned sleeve segments that together therewith form a composite plug unit that can be rotated in the housing bore by a proper key. Formed on the outer surface of each sleeve segment coincident with pinways therein are recesses that are spaced from the recesses in adjacent sleeve segments. Additional internal recesses are formed in the inner surface of at least one of the sleeve segments closely adjacent a pinway extending therethrough. The internal recesses receive the tumbler pin when it is forced upwardly simultaneously with the application of torque on the plug. In one embodiment, the internal recess is a single recess coincident with the pinway and extending circumferentially therefrom. In another embodiment, the internal recess comprises a pair of recesses located on opposite sides of the pinway and spaced circumferentially therefrom.

REFERENCES:
patent: 899955 (1908-09-01), Collins
patent: 2294495 (1942-09-01), Woodruff
patent: 3705508 (1972-12-01), Fritsch

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