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:
Nov. 08, 1977
Filed:
Jun. 11, 1976
Dwight W Glass, Rockford, IL (US);
Keystone Consolidated Industries, Inc., Peoria, IL (US);
Abstract
An automobile ignition lock includes a plug with a plurality of tumblers. The plug is rotatably mounted in a cylinder and includes a slot for receipt of a tumbler actuating key. A key bolt is positioned at the inner end of the key slot and is movable in response to insertion of the key in the key slot from a plug locking to a plug unlocking position. Excessive longitudinal transfer or movement of the key bolt relocks the plug and cylinder and prevents relative rotation. Thus, a key with appropriate bitting and of appropriate length must be used to effect unlocking of the plug from the cylinder. As an additional security feature of the lock, the plug is designed with a circumferential slot that fractures and separates the plug into two separate portions when an attempt is made to forceably rotate the plug relative to the cylinder.