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:
Sep. 09, 2008
Filed:
Aug. 31, 2005
Shunichi Osada, Kanagawa, JP;
Shunichi Osada, Kanagawa, JP;
Alpha Corporation, Yokohama, JP;
Abstract
Tumbler pinsare movably housed in a plug. A locked/unlocked state is determined by the turning position on the moving direction center axes of the tumbler pins. An unlocking keyto be inserted into the plugis provided with unlocking code forming recessesfor determining the turning positions of the tumbler pins at code decision positions. The tumbler pinsare provided at their leading end portions with drive portions, which have slope sides of conical faces gradually reduced in diameter toward the leading ends and having rotational centers offset from the moving direction center axes. The side wall faces of the unlocking code forming recessesare formed of conical faces having rotational centers substantially aligned with those of the conical faces forming the slope sides of the drive portions. At code decision positions, the slope sides of the drive portionsare forced to contact with the side wall faces of the unlocking code forming recessesthereby to determine the turning positions of the tumbler pins