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. 31, 1985
Filed:
Aug. 29, 1984
Applicant:
Inventors:
Hubert Taubert, Neuwied, DE;
Rudolf Webendoerfer, Neuwied, DE;
Assignee:
Conti Fasteners AG, Zug, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21H / ; B21D / ;
U.S. Cl.
CPC ...
72 88 ; 10 1 / ; 1015 / ; 72365 ; 72469 ;
Abstract
Method and dies for threading a screw comprises providing a screw blank with a portion of its length of lobular cross section and an adjacent portion of the blank of circular cross section. The blank is rolled between roll dies so as to roll the thread on the circular portion and simultaneously roll the thread at the lobes only on the lobular portion. Thereafter, the blank is rolled to additional regions of the dies wherein the thread is rolled to form on the lobular section, while the cylindrical section passes through regions of clearance or relief on the dies.