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:
Dec. 19, 2000
Filed:
Mar. 16, 1999
Tadashi Okumura, Koga-gun, JP;
Mutsumi Kato, Koga-gun, JP;
Gohsyu Corporation, Shiga, JP;
Abstract
A cold deep hole forming device is capable of forming, by cold forging a deep hole for an involute spline, etc. with high accuracy and in a simple way, even in a member to be formed that is partially different in thickness. A supporting base 1A supports the member W to be formed and a punch 1B forms the deep hole H in the member W. A clamp holder 3 is provided on the outer circumference of the punch 1B. A clamp 2 is composed of split clamping pieces 21 disposed in the clamp holder 3. When forming deep hole H in the member W with the punch 1B, the clamping pieces 21 are made to move in the direction of the center under fluid pressure so as to constrain the member W to be formed at its outer circumference having a small diameter portion WT.