The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 21, 1978
Filed:
Dec. 08, 1976
Edward H Seidewand, Rochester, NY (US);
General Motors Corporation, Detroit, MI (US);
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.