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:
Apr. 04, 1995
Filed:
Sep. 30, 1993
Shunichi Osada, Yokohama, JP;
Alpha Corporation, Kawasaki, JP;
Abstract
A cylinder lock having a key insertion hole or clearance formed between a casing and a key guide member. A key for the cylinder lock is provided with a thin cylindrical member which is to be inserted into the annular key insertion hole when the key is inserted into the cylinder lock. The cylindrical member is filled at its first end section with a part of a key shank. A slider is slidably disposed inside the cylindrical member and normally located inside the second end section of the cylindrical member. The slider is formed at its tip end with a fitting projection which is to be fitted in a guiding depression formed at the tip end face of the key guide member. The key insertion hole is formed narrow or thin, corresponding to the thin cylindrical member of the key, thereby preventing a picking tool from being inserted through the narrow key insertion hole into the cylinder lock.