Patents by Inventor Tatsuya Takeshita

Tatsuya Takeshita has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Hydraulic control device of working machine
    Patent number: 7921764
    Abstract: A rotation prioritizing valve serving as a flow rate control valve of a hydraulic pilot type is provided on the meter-in side of an arm cylinder. At the time of a combined operation of arm pulling and rotation, the rotation prioritizing valve is activated by rotation pilot pressure so that a meter-in flow rate of the arm cylinder is throttled to prioritize rotation movement. On the premise of the above, a switching valve is provided in a pilot line of the rotation prioritizing valve and switched so as to release a throttling effect of the rotation prioritizing valve when boom lowering movement is added to the combined operation of arm pulling and rotation so that a rotation prioritizing function is cancelled.
    Type: Grant
    Filed: April 4, 2008
    Date of Patent: April 12, 2011
    Assignee: Kobelco Construction Machinery Co., Ltd.
    Inventor: Tatsuya Takeshita
  • HYDRAULIC CONTROL DEVICE OF WORKING MACHINE
    Publication number: 20080250782
    Abstract: A rotation prioritizing valve serving as a flow rate control valve of a hydraulic pilot type is provided on the meter-in side of an arm cylinder. At the time of a combined operation of arm pulling and rotation, the rotation prioritizing valve is activated by rotation pilot pressure so that a meter-in flow rate of the arm cylinder is throttled to prioritize rotation movement. On the premise of the above, a switching valve is provided in a pilot line of the rotation prioritizing valve and switched so as to release a throttling effect of the rotation prioritizing valve when boom lowering movement is added to the combined operation of arm pulling and rotation so that a rotation prioritizing function is cancelled.
    Type: Application
    Filed: April 4, 2008
    Publication date: October 16, 2008
    Applicant: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
    Inventor: Tatsuya TAKESHITA