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:
Jan. 13, 1987
Filed:
Apr. 26, 1985
Applicant:
Inventors:
Seiji Seki, Kanazawa, JP;
Kiyoji Aoshima, Komatsu, JP;
Assignee:
Kabushiki Kaisha Komatsu Seisakusho, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21J / ;
U.S. Cl.
CPC ...
7245313 ; 72351 ; 267119 ; 100259 ;
Abstract
In a die cushion apparatus, a die cushion mechanism for achieving a die cushioning capability as relying upon a preset pneumatic pressure is provided with a hydraulic pressure chamber into which a piston connected to a die cushion pad is fitted, the hydraulic pressure chamber is provided with a hydraulic pressure feed circuit and an exhaust circuit, a relief valve whose relief pressure is controllable is disposed in the exhaust circuit, and relief pressure control means is coupled to the relief valve.