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:
Aug. 01, 1978
Filed:
Oct. 20, 1976
Walter E Surko, Jr, Southington, CT (US);
Emhart Industries, Inc., Farmington, CT (US);
Abstract
A pin tumbler lock cylinder having axially elongated split pin tumbler assemblies each including a pin tumbler and a driver releasably coupled in locked position to prevent rotation of a key plug relative to a supporting cylinder shell. Insertion of a proper angularly bitted key into the key plug causes the tumbler assemblies to axially translate and rotate within bores, defined by the shell and the plug in its locked position, to predetermined releasing positions wherein a split line of each tumbler assembly is aligned with a shear line between the plug and the shell and each pin tumbler is free to separate from its associated driver to permit rotation of the key plug to an unlocked position. Means are provided to prevent rotation of the drivers and tumblers relatively to the shell and plug respectively, when the plug is rotated to an unlocked position. In a master keyed lock cylinder drivers are coupled to pin tumblers by master pins.