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. 10, 2015
Filed:
Dec. 04, 2013
Kwikset Corporation, Lake Forest, CA (US);
Hanna O. Farag, Riverside, CA (US);
John C. Charnley, Newcastle Upon Tyne, GB;
Mark S. Bloom, Lake Forest, CA (US);
Clinton E. Sheppard, Mountain Home, AR (US);
Kwikset Corporation, Lake Forest, CA (US);
Abstract
A torque augmentor operatively associated with the cylinder assembly and the plug assembly of a pin tumbler lock cylinder increases the threshold torque required to rotate the plug assembly in the cylinder assembly, thereby hampering an attacker's 'feel' for the relationship of the cylinder pins to the shear line, and of the plug assembly to the cylinder. One embodiment of the pick-resistant lock cylinder includes a spring-biased ball normally disposed across the shear line. Another embodiment has a cam normally biased into engagement with a cam follower, the cam being disposed on one of the cylinder assembly and the plug assembly, and the cam follower being disposed on the other. Another embodiment includes an hourglass-shaped false shear line creator operatively associated with the cylinder assembly and plug assembly. The coaction of the torque augmentor and false shear line creator of the lock cylinder of the present invention also hampers an attack by bumping.