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:
Jun. 25, 2002
Filed:
Oct. 13, 2000
Yoshizumi Nishimura, Tsuchiura, JP;
Yusaku Nozawa, Ibaraki-gun, JP;
Kinya Takahashi, Tsuchiura, JP;
Mitsuhisa Tougasaki, Niihari-gun, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
It is an object of the present invention to provide a control valve which can reduce the number of external lines connected to a hydraulic remote control valve. A control valve for controlling hydraulic cylinders ′ is provided, in one of spool covers, with fluid passages ′, a shuttle valve for selecting higher one of pilot pressures to be transmitted to these fluid passages ′, and a fluid passage for transmitting the pressure selected by the shuttle valve . The fluid passages ′ are in communication with pressure fluid ports ′ as connection ports for pilot lines . The control valve is also provided, in the other spool cover , with fluid passages ′, a shuttle valve for selecting higher one of pilot pressures to be transmitted to these fluid passages ′, and a fluid passage for transmitting the pressure selected by the shuttle valve . The fluid passages ′ are in communication with pressure fluid ports ′ as connection ports for pilot lines