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:
Dec. 10, 2019
Filed:
Jun. 01, 2017
Hitachi Construction Machinery Co., Ltd., Taito-ku, Tokyo, JP;
Yudai Itai, Ibaraki, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A haulage vehicle includes a vessel, hoist cylinders, a control valve devicethat controls a supply or discharge of pressurized oil to or from the hoist cylinders, a controller, and a tilt angle detectorthat detects a tilt angle of the vessel. The controllercompares a down assist performing angle, which is a tilt angle preset to determine whether negative pressure control processing needs to be performed for offsetting a force applied in a direction that would cause the hoist cylindersto extend, with the detected tilt angle and, if the detected tilt angle is determined to be equal to or greater than the down assist performing angle, outputs a control valve signal to the control valve deviceso that the valve is opened to forcibly discharge pressurized oil from the hoist cylinders