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:
Oct. 10, 2017
Filed:
Sep. 01, 2014
Hitachi Construction Machinery Co., Ltd., Bunkyo-ku, Tokyo, JP;
Juri Shimizu, Tokyo, JP;
Teppei Saitoh, Tokyo, JP;
Mariko Mizuochi, Tokyo, JP;
Kenji Hiraku, Tsuchiura, JP;
Akinori Ishii, Tsuchiura, JP;
Hiromasa Takahashi, Tsuchiura, JP;
Takashi Kusama, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
To provide a driving device capable of improving the operability of a plurality of single rod hydraulic cylinders. The present invention takes a construction provided with a closed circuit A in which first and third hydraulic pumpsand a boom cylinderare connected through selector valvesin a closed-circuit fashion, a plurality of open circuits E, F provided with second and fourth hydraulic pumpsand selector valvesthat switch the supply destinations of hydraulic oils flowing out from the second and fourth hydraulic pumps, and a connection passageconnected to sides of the selector valvesfrom which sides hydraulic oil flows out, and connected to the closed circuit A.