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:
May. 11, 2004
Filed:
Sep. 27, 2002
Kazuharu Tajima, Hiroshima, JP;
Kobelco Construction Machinery Co., Ltd., Hiroshima, JP;
Abstract
A hydraulic motor is rotationally driven as pressure oil from a hydraulic pump is supplied by way of a control valve. A remote control valve is adapted to switch the control valve. A bypath line is connected to both hydraulic lines of the hydraulic motor. A communicating valve has a position for closing the bypath line and a position for opening the bypath line. A throttle valve controls the communicating valve, wherein the throttle valve is adapted to set the communicating valve to a closed position at the time when the remote control valve is operated for rotating, and to set the communicating valve to an open position at the time when the remote control valve is returned to a neutral position, as well as to allow the pressure oil of deceleration side to be released by a predetermined time, whereby the flapping of the machine which may be caused, such as at the time when the rotation is stopped in the hydraulic excavator, can be avoided.