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:
Jun. 12, 2001
Filed:
Nov. 10, 1999
James A. McClung, North Canton, OH (US);
Manuel P. Rubalcava, San Jose, CA (US);
Abstract
Apparatus and method for forming cup-shaped metal members from a flat metal sheet in a press having a ram which moves a cut edge, draw horn and draw pad towards a base holding a blank and draw die. The draw pad is formed with an annular tapered relief area extending from its clamping surface to an annular wall of a central opening formed in the draw pad for reducing the clamping force which is exerted on a peripheral edge of the disk blank as the draw horn advances into the die opening of the blank and draw die to form the cup-shaped member. The angle of taper of the relief area is generally in the range of 4° and 10°. This tapered area reduces excess pinching of the peripheral edge of the disk blank as it moves around the die radius as the draw horn draws the disk blank into the cup-shaped member.