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:
Aug. 10, 1993
Filed:
Jun. 29, 1992
Madhu S Chatterjee, Carmel, IN (US);
William I Stuehr, North Royalton, OH (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A contour hardening apparatus for flat steel work pieces, such as gears, having convoluted surfaces around their circumferences, the apparatus including an annular inductor housing, a mandrel in the center of the inductor housing, and air bearing rotatably mounting the work piece on the mandrel, an air nozzle on the inductor housing aimed at the convoluted surfaces and operative in an ON condition to direct a jet of compressed air against the convoluted surfaces to develop on the work piece a first turning moment in a first direction to rotate the work piece in the first direction during heating, an oil manifold on the inductor housing supplied with oil under pressure and including a first plurality of oil nozzles in the plane of the work piece each oriented to direct a jet of oil at the convoluted surfaces to develop on the work piece a second turning moment opposite the first turning moment, and means to supply the oil manifold with oil under pressure when the air nozzle is in an OFF condition. The jets of oil from the first plurality of nozzles stop the rotation of the work piece at the onset of oil quench.