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. 27, 2007
Filed:
Aug. 02, 2004
Applicant:
Charles W. Eden, Jr., Lewisville, NC (US);
Inventor:
Charles W. Eden, Jr., Lewisville, NC (US);
Assignee:
Kaba Ilco Corp., Winston-Salem, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E05B 19/06 (2006.01); E05B 29/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a pin tumbler-type cylinder lock having an auxiliary tumbler stack, the bottom pin of the auxiliary tumbler stack has a recessed underside for receiving a projection on the key to form a detent. The invention provides an additional functionality that has not previously been associated with the auxiliary tumbler stack. When the projection on the key as seated, it prevents the key from being withdrawn from the keyway while the plug is in any rotational position in which the drive and bottom pins are not substantially aligned. Thus, the key is retained whenever the plug has been rotated.