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. 27, 2011
Filed:
Mar. 28, 2008
Applicants:
Tomoji Sato, Minami-Alps, JP;
Keisuke Nanri, Minami-Alps, JP;
Inventors:
Tomoji Sato, Minami-Alps, JP;
Keisuke Nanri, Minami-Alps, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16D 55/02 (2006.01); F16D 65/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method of manufacturing a cylinder apparatus wherein although an opening of a cylinder body is closed by a covering member, processing and parts costs are reduced, fluid leakage is prevented, and the apparatus can be reduced in size. The cylinder apparatus includes a piston () which is caused to slidingly move in a bore () of a cylinder (). The cylinderincludes a covering member () provided in a bottom portion () of the cylinder (), and a cylinder body () having an opening that is closed by the covering member (). The covering member () is friction stir welded to the cylinder body ().