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. 12, 1994
Filed:
Jan. 22, 1993
Michael Janusz, Elgin, IL (US);
George G Dewey, Prospect Heights, IL (US);
Illinois Tool Works Inc., Glenview, IL (US);
Abstract
An improved fastener having a non-circular head with a concave recess providing a datum useful in centering the head relative to a non-circular socket of a driving member is disclosed. The recess may have a frusto-conical wall defining an upper, circular edge or substantially triangular walls defining an upper, non-circular edge. An improved tool useful to drive the improved fastener is also disclosed. In the improved tool, a driving member has a tubular extension with a non-circular socket, and a centering pin is axially movable toward and extended position, in which a convex end of the centering pin fits into the concave recess of the screw head when the socket of the tool extension is axially fitted over the fastener head. The centering pin is biased toward the extended position.