Patents by Inventor Masaaki Tachinoh

Masaaki Tachinoh 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 circuit with variable relief valves
    Patent number: 5081838
    Abstract: A hydraulic circuit for a hydraulic shovel includes a variable displacement hydraulic pump; selector valves communicated with the variable displacement hydraulic pump; actuators communicated with the selector valves; variable relief valves provided in a discharge oil passage of the variable displacement hydraulic pump and also provided in input oil passages of some of the actuators; a pilot hydraulic pump communicated with the variable relief valves through pilot oil passages; a solenoid valve provided in the pilot oil passage for changing set pressures of the variable relief valves; a regulator for controlling a discharge quantity of the variable displacement hydraulic pump; and a pilot oil passage for communicating the solenoid valve with the regulator.
    Type: Grant
    Filed: March 28, 1989
    Date of Patent: January 21, 1992
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Satoshi Miyaoka, Masaaki Tachinoh