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:
Sep. 21, 1982
Filed:
Nov. 21, 1980
Applicant:
Inventor:
Benjamin I Bachrach, Dearborn, MI (US);
Assignee:
Ford Motor Company, Dearborn, MI (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23P / ;
U.S. Cl.
CPC ...
219 / ; 72467 ;
Abstract
A method and tool for making an extrusion die wherein the extrusion has a lobed helical outer contour. An electrical discharge machining electrode has an identical outer contour. Mounted integrally with the electrode is a lead bar having a guide recess that makes a second helix angle with respect to the axis of the electrode. A guide pin fixedly mounted with respect to the moving assembly is located within the recess. Axial movement and rotation of the electrode through the die blank is controlled by the pin and recess.