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:
Feb. 09, 1999
Filed:
Jul. 28, 1993
Applicant:
Inventors:
Hans Vondracek, Breckerfeld, DE;
Heinz Krober, Hagen, DE;
Assignee:
Fried. Krupp AG Hoesch-Krupp, Dortmund, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ; B41F / ;
U.S. Cl.
CPC ...
266116 ; 266103 ; 72135 ; 72137 ; 72138 ; 72141 ; 72145 ;
Abstract
The objects are a reliable and economical method of and device for manufacturing helical springs that are curved when unstressed from sections of wire or rod heated to coiling temperature. The spring is coiled straight and then curved it to its final shape. The device consists of a hot-coiling production line comprising a kiln (1), a series of rollers (2), a coiling bench (4), and a quenching tub (6). A tool (5) for curving helical springs (10 or 14) is integrated into the production line between the coiling bench and the quenching tub.