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:
Jan. 27, 2015
Filed:
Apr. 19, 2011
Koichiro Tsukane, Kanagawa, JP;
Koichiro Tsukane, Kanagawa, JP;
Sumitomo Heavy Industries, Ltd., Tokyo, JP;
Abstract
In a construction machine, a boom assist cylinder (A) assists an operation of a boom () by a hydraulic pressure, and an arm assist cylinder (A) assists an operation of an arm () by a hydraulic pressure. An accumulator () accumulates operation oil to be supplied to the boom assist cylinder and the arm assist cylinder in a pressurized state. A first hydraulic pipe () connects between the boom assist cylinder and the arm assist cylinder. A second hydraulic pipe () connects between the arm assist cylinder and the accumulator. The second hydraulic pipe is connected to a hydraulic connection port of the arm assist cylinder so that the operation oil is supplied in a direction of closing the arm from the accumulator to the arm assist cylinder.