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:
Nov. 03, 1992
Filed:
Jul. 11, 1991
Hidaka Seiki Kabushiki Kaisha, Tokyo, JP;
Abstract
A die set for forms fins of heat exchangers and a manufacturing device using the die set. The die set for manufacturing fins of heat exchangers, comprising a punch and a die for forming a projected section, which is formed along an edge of a hole bored in a metal plate, into a collar with a prescribed height. The die has a hollow section into which the punch is capable of entering and the outer circumferential face of the punch is a tapered face in the form of a truncated cone. The tapered face faces the inner face of the die when the upper end section of the punch proceeds beyond the upper end of the projected section, which is held between the outer circumferential face of the punch and the inner face of the die, and the projected section so held is extruded by reduction of the distance between the outer circumferential face of the punch and the inner face of the die, which hold the projected section therebetween, caused by movement of the tapered face of the punch into the hollow section of the die.