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:
Oct. 24, 1989
Filed:
Apr. 08, 1988
Applicant:
Inventors:
Katsuo Endo, Miyagi, JP;
Masahiro Makino, Miyagi, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; F16B / ; F16B / ;
U.S. Cl.
CPC ...
242199 ; 411412 ; 411413 ; 411510 ;
Abstract
A screw including a head and a shaft having a helically threaded portion and a barbed portion is provided. In operating the barbed portion driven into a hole by pressure on the head in the axial direction. When the barbed portion is completely driven into the hole, the threaded portion comes into contact with the wall of the hole for driving the screw slightly further into the hole in this manner tight engagement between the two members fastened by the screw can be achieved. The barbed portion is so formed as to prevent removal of the screw.