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. 22, 2008
Filed:
May. 12, 2004
Keiji Inoue, Hamana-gun, JP;
Takayoshi Sasaki, Hamana-gun, JP;
Koji Kidowaki, Toyohashi, JP;
Nobuyuki Matsumoto, Hamakita, JP;
Masanori Takeuchi, Nukata-gun, JP;
Keiji Inoue, Hamana-gun, JP;
Takayoshi Sasaki, Hamana-gun, JP;
Koji Kidowaki, Toyohashi, JP;
Nobuyuki Matsumoto, Hamakita, JP;
Masanori Takeuchi, Nukata-gun, JP;
ASMO Co., Ltd., Shizuoka-pref., JP;
Abstract
In a forging process step, a small diameter portionis formed in the leading end portion of a cylindrical shaft material, and an installation depressed portionis formed on a base end face of the shaft materialfor installing a balltherein to receive thrust force, by cold forging process using a forging mold. In a worm forming process after the forging process step, a wormis formed in the small diameter portionby rolled dies. The small diameter portionand the installation depressed portionare formed by cold forging process, so that an outer circumferential face of the small diameter portionand an inner face of the installation depressed portionbecome even surfaces with small surface roughness.