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. 07, 2005
Filed:
Dec. 06, 2002
Takao Mikami, Sakaiminato, JP;
Yoshiki Masugata, Yonago, JP;
Takao Karaoke, Hakuta, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A modified cross-section wire material is formed into piston rings such as oil-control rings for use in an engine. An apparatus of the present invention for forming the modified cross-section wire material has a forming unit () comprising in combination a non-powered pre-stage four-roll turks-head () and a powered post-staged four-roll turks-head (). Disposed in tandem and downstream of the forming unit () is a non-powered finishing four-roll turks-head (). A forming roll of the powered turks-head () has a diameter equal to or larger than 70 times as much as a height-of a flange of the material. In forming, the material is kept at a tension equal to or less than 300 N between the non-powered turks-head stand () and the powered turks-head (), and at a tension of from 50 to 200 N between the forming unit () and the finishing turks-head ().