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:
Mar. 22, 2005
Filed:
Jul. 16, 2001
Masaaki Ehara, Akashi, JP;
Katsuki Yamagata, Akashi, JP;
Taisuke Tsunoo, Akashi, JP;
Takahiro Kobayashi, Akashi, JP;
Ryo Yamamoto, Kobe, JP;
Noboru Ito, Kobe, JP;
Masaaki Ehara, Akashi, JP;
Katsuki Yamagata, Akashi, JP;
Taisuke Tsunoo, Akashi, JP;
Takahiro Kobayashi, Akashi, JP;
Ryo Yamamoto, Kobe, JP;
Noboru Ito, Kobe, JP;
Kobelco Construction Machinery Co., Ltd., Hiroshima, JP;
Abstract
The present invention provides a hydraulic circuit for a crane wherein a switching valve is provided between a plurality of motor circuits connected in series within the same actuator group, and at the time of simultaneous operation of the motor circuits, the switching valve is switched from a first position to a second position whereby the series connection between the motor circuits is cut off, and they are driven by each of separate hydraulic sources, thereby enabling prevention of pressure interference at the time of simultaneous operation of the motor circuits within the same actuator group without increasing hydraulic sources.