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:
May. 16, 2006
Filed:
Jun. 25, 2003
Applicant:
Nobutsuna Motohashi, Tokyo, JP;
Inventor:
Nobutsuna Motohashi, Tokyo, JP;
Assignee:
Koyo Seiko Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D 53/84 (2006.01); F01L 1/18 (2006.01);
U.S. Cl.
CPC ...
Abstract
When forces given in the processes of machining in the cross direction and machining for forming a groove are adjusted and the machining is repeatedly conducted by a plurality of times, the valve engaging portion () is machined, and the metal flow () formed between the valve guide walls () and the connecting wall () is prevented from being cut off. Therefore, the rigidity of the valve engaging portion () can be ensured, and the quality of the rocker arm () can be stabilized.