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:
Apr. 23, 1996
Filed:
Sep. 08, 1994
Tetuo Ohno, Nagoya, JP;
Yoshitaka Kuroda, Anjo, JP;
Hisashi Kobayashi, Kariya, JP;
Yoshinobu Matuzaki, Anjo, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
Forming rollers having a tooth tip concave portion at the tip of a tooth tip portion, a tooth bottom convex portion at a bottom of a tooth bottom portion and louver cutter at an oblique line portion between the tooth tip portion and the tooth bottom portion. A radius of an arc-shaped portion of the tooth tip concave portion at front side of rotational direction is set to be larger than a radius of an arc-shaped portion of the tooth tip concave portion at a rear side of the rotational direction. A radius of an apex portion of the tooth tip portion at the front side is set to be smaller than a radius of an apex portion of the tooth tip portion at the rear side and louver cutter at the oblique line portion is formed to have a predetermined interval from the apex portions of tooth tip portion. Therefore, flat folded portions having substantially the same curvature at both shoulder portions thereof horizontal are formed.