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. 19, 1991
Filed:
May. 02, 1990
John A Catanese, Seward, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A ferrous metal detector is used in conjunction with a ferrous metal mandrel of a pilger tooling set in a cold-pilgering machine to sense when the mandrel breaks during operation of the machine. The ferrous metal detector includes a transformer located adjacent to an end of the mandrel. The transformer has a primary winding and a secondary winding positioned along the path of tubing movement through the machine and sufficiently close to one another to be magnetically coupled together by a piece of the ferrous mandrel when located therebetween. The primary winding is excited by a suitable source with a constant predetermined signal which is transparent to non-ferrous metal of the tubing. Such signal couples a constant voltage in the secondary winding. An indicator is connected to the secondary winding for detecting a change in the constant voltage in the secondary winding being the result of an increase in magnetic coupling between the primary and secondary windings as would be produced by advancement of a broken piece of the ferrous metal mandrel between the windings.