Patents by Inventor Hiroyasu Masubuchi

Hiroyasu Masubuchi 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).

  • Joystick for electro-hydraulic control system
    Patent number: 7265304
    Abstract: A joystick for an electro-hydraulic control system is provided with a rotary potentiometer having a pivotable arm. This pivotable arm is integrally arranged on a rotary shaft and pivots responsive to pivotal control of a joystick in a predetermined direction or a direction opposite to the predetermined direction. The joystick is also provided with a torsion coil spring for normally holding the pivotable arm in a neutral position, a pin arranged on the pivotable arm and capable of expanding the torsion coil spring upon pivotal movement of the pivotable arm, a holding pin for holding the torsion coil spring at its coil portion, and a cover member having a pair of guide portions for limiting movements of the coil portion of the torsion coil spring in the predetermined direction and the opposition direction when the torsion coil spring is in its neutral position.
    Type: Grant
    Filed: December 7, 2005
    Date of Patent: September 4, 2007
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Nobuhiko Ichiki, Mitsuhisa Tougasaki, Kaoru Endo, Hiroyasu Masubuchi
  • Joystick for electro-hydraulic control system
    Publication number: 20060117891
    Abstract: A joystick for an electro-hydraulic control system is provided with a rotary potentiometer having a pivotable arm. This pivotable arm is integrally arranged on a rotary shaft and pivots responsive to pivotal control of a joystick in a predetermined direction or a direction opposite to the predetermined direction. The joystick is also provided with a torsion coil spring for normally holding the pivotable arm in a neutral position, a pin arranged on the pivotable arm and capable of expanding the torsion coil spring upon pivotal movement of the pivotable arm, a holding pin for holding the torsion coil spring at its coil portion, and a cover member having a pair of guide portions for limiting movements of the coil portion of the torsion coil spring in the predetermined direction and the opposition direction when the torsion coil spring is in its neutral position.
    Type: Application
    Filed: December 7, 2005
    Publication date: June 8, 2006
    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
    Inventors: Nobuhiko Ichiki, Mitsuhisa Tougasaki, Kaoru Endo, Hiroyasu Masubuchi