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. 03, 2015
Filed:
Mar. 06, 2013
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
HITACHI CONSTRUCTION MACHINERY, CO., LTD., Tokyo, JP;
Abstract
A control valve device () controls supply and discharge of pressurized oil to and from a hoist cylinder () which tilts a vessel (). A throttle (C) that limits a flow rate of hydraulic oil which is discharged from a hydraulic pump () and flows in a return line () through a pump line (), a first directional control valve () and a center bypass oil passage () is provided in the floating position (F) of the first directional control valve (). When the first directional control valve () is in the floating position (F), the upstream side of the throttle (C) is connected to the pump line (), and the downstream side of the throttle (C) is connected to the return line (). In addition, a rod-side actuator line () communicated with rod-side oil chambers (E,F) in the hoist cylinder () is connected to the pump line ().