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:
Dec. 22, 1987
Filed:
May. 12, 1986
Richard H Corrette, Cleveland, OH (US);
Colt Industries Operating Corp., West Hartford, CT (US);
Abstract
Improved thread rolling dies are disclosed forming fasteners with a cylindrical threaded portion and a threaded pointed portion. Such dies provide a polished rise angle surface for forming and threading the pointed portion of the fastener so as to promote slippage between such surface and the pointed portion of the fastener. The polished rise angle surface improves point formation, provide better filled threads, reduced burning of the fastener and increases die life. The dies also provide a match point spaced from the end of the short die so as to reduce the likelihood of improper timing when the dies are set up in the thread rolling machine. Further the dies provide an angulated top of the rise surface to break off any whiskers or tails which might otherwise project beyond the end of the point of the fastener being formed.