Lock cylinder assembly

Details Lock cylinder assembly Lock cylinder assembly

1976-12-08

1978-02-21

Wolfe, Robert L.

Locks

Attack-actuated defeating mechanisms

70422, E05B 1516

Patent

active

040745473

ABSTRACT:
A lock cylinder assembly for a motor vehicle ignition switch includes a lock core rotatable in a cylindrical opening of a housing. A lock bar acts between the core and the housing to normally lock the core against rotation and to unlock the core to permit rotation when a properly bitted key is inserted into a key slot of the core. A frangible retainer acts between the core and the housing to define a normal axial relation therebetween and fractures under an axial extracting force to permit axial outward movement of the core relative the housing. A second retainer acts between the housing and the core and is effective upon limited axial movement of the core permitted by fracture of the frangible retainer to block further axial movement and rotational movement of the core relative the housing. The core has a weakened cross section intermediate the key slot and the second retainer whereby the core is fractured and a core inner portion is retained in the housing by the second retainer while a core outer portion is removed.

REFERENCES:
patent: 1662487 (1928-03-01), Briggs
patent: 2004434 (1935-06-01), Fitz Gerald
patent: 2031155 (1936-02-01), Fitz Gerald
patent: 4008588 (1977-02-01), Miller

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