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:
Mar. 22, 1988
Filed:
Nov. 22, 1985
Applicant:
Inventor:
Oliver A Bell, Jr, Statesville, NC (US);
Assignee:
Colt Industries Inc., New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23H / ; B23H / ;
U.S. Cl.
CPC ...
219 / ;
Abstract
A closed loop servo feed system for an EDM ram. A gap voltage signal is processed to control the servo feed operation with respect to ram velocity and also ram direction. A first network is provided with a voltage to frequency section for controlling ram velocity. A second network includes a raise/lower ram section with a comparator to determine the direction of ram movement.