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:
Aug. 19, 2014
Filed:
Mar. 23, 2009
Masahiro Ashiba, Kanagawa, JP;
Kenji Hikosaka, Yokohama, JP;
Masahiro Ashiba, Kanagawa, JP;
Kenji Hikosaka, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A fluid pressure shock absorber includes a piston which is constituted by two piston bodies. An annular valve seat is formed on a non-coupled surface of one of the piston bodies, so that extension-side communication passages are located radially inside the annular valve seat and compression-side communication passages are located radially outside the annular valve seat, and an annular valve seat is formed on a non-coupled surface of the other of the piston bodies, so that the compression-side communication passages are located radially inside the annular valve seat and the extension-side communication passages are located radially outside the annular valve seat. A sliding member is disposed around one of the pitons bodies. A rotation preventing unit for preventing relative rotation of the piston bodies is provided on coupled surfaces and of the piston bodies. A nut for fastening the piston bodies and disk valves is disposed at an end of a piston rod.