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:
Nov. 29, 2016
Filed:
Jul. 23, 2014
Kobelco Construction Machinery Co., Ltd., Hiroshima-shi, JP;
Yusuke Kamimura, Hiroshima, JP;
KOBELCO CONSTRUCTION MACHINERY CO., LTD., Hiroshima-shi, JP;
Abstract
Provided is a slewing-type working machine capable of reducing back pressure generated during slewing. The slewing-type working machine includes: a base carrier; an upper slewing body; a hydraulic motorincluding first and second portsandand slewing the upper slewing body; a hydraulic pump, a slewing operation deviceincluding an operating member; a control valvecontrolling the hydraulic motorbased on the operation signal of the slewing operation device; first and second pipe-linesconnecting the first and second portsandof the hydraulic motorto the control valve; a communication switching deviceandcapable of switching communication and cutting of between both pipe-linesand the tank T; and a switching command sectionoperating the communication switching devicesand, when the upper slewing body is slewed, to bring only a pipe-line, which corresponds to a discharge-side pipe-line of the hydraulic motor, of the pipe-linesandinto communication with the tank T, while bypassing the control valve