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:
Nov. 20, 1979
Filed:
Aug. 26, 1977
Venanzio Bizzari, Hallstahammar, SE;
Enar Hogfors, Hallstahammar, SE;
Bulten-Kanthal AB, Hallstahammar, SE;
Abstract
A method of hot bending a generally straight wire blank of a material being brittle in cold condition into a wire element having straight end portions and coils formed therebetween. According to the invention the rod blank is hot bent without a mandrel by clamping the end portions of the rod blank by means of two clamping jaws. The rod blank is heated to a softening temperature in the central wire portion which is to form the coils of the finished wire element, while the end portions are kept at a lower temperature. During the bending process at least one of the clamping jaws is brought along a movement path adapted to the desired coil formation.