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:
Jan. 08, 1991
Filed:
Mar. 08, 1990
Joseph A Simon, Boseville, MI (US);
Other;
Abstract
A metal tube, such as a valve body sleeve, is cold extruded to form full length and partial length longitudinal channels in its interior wall surface. The channeled tube is formed by extruding a metal, tubular blank, through an open ended die having an extrusion die throat at one end. A punch is inserted in the die and bears against an end of the blank for pushing the blank longitudinally through the die throat. The punch has an extension, having a leading edge section and a trailing edge section that pass through the blank. Longitudinally extending teeth are formed on the two sections, with some of the teeth being continuously longitudinally aligned and others being located only on the trailing section. Initially, the leading section is arranged within the die throat and the leading end portion of the blank is extruded through the die throat, around the extension leading section to form channels therein. Then, the punch trailing section is within the die throat as the punch continuously pushes the blank through the die throat so as to continue the formation of the channels started by the leading sections while simultaneously forming channels in the intermediate portion of the blank. Then, the punch is removed, a new blank is inserted against the first blank, and the punch is replaced for pushing the second blank, and thereby, the first blank through the die throat while the punch leading section is positioned within the die throat so as to continue the formation of full length channels while discontinuing the formation of partial channels within the intermediate portion of the blank.