Pin tumbler lock with pull resistant plug

Details Pin tumbler lock with pull resistant plug Pin tumbler lock with pull resistant plug

1976-09-24

1978-01-17

Wolfe, Robert L.

Locks

Operating mechanism

Key

70373, 70375, 70419, E05B 2704

Patent

active

040685080

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. The bottoms of the recesses form false shear levels that hinder picking operations while the side walls thereof form pin obstructions that prevent forcible axial removal of the plug and sleeve unit from the cylindrical housing. Additional security is provided between the plug and at least one sleeve segment by a mechanical coupling that prevents relative axial motion therebetween. The coupling prevents axial removal of the plug.

REFERENCES:
patent: 899955 (1908-09-01), Collins
patent: 2051772 (1936-08-01), Turrell
patent: 2121301 (1938-06-01), Rectliffe
patent: 2294495 (1942-09-01), Woodruff
patent: 3531959 (1970-10-01), Weber

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