Patents by Inventor Shu h-uai Zhang

Shu h-uai Zhang 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).

  • Scraper blade control apparatus
    Patent number: 5426874
    Abstract: In an apparatus for controlling the vertical movement of a scraper blade (18) of a bulldozer, a four-position hydraulic control valve (12), having HOLD, UP, DOWN, and FLOAT positions, maintains the scraper blade in the FLOAT condition without requiring a detent mechanism, even when the three-position operation lever (1, 51) is released with the hydraulic control valve (12) in the FLOAT position. The operation lever (1, 51), having HOLD, UP, and DOWN positions, provides electrical signals to a controller (4) for actuating the hydraulic control valve (12) with pilot pressures provided via solenoid pilot valves (6, 7). A hydraulic cylinder (19), connected to the scraper blade (18), is actuated by hydraulic oil from the hydraulic control valve (12).
    Type: Grant
    Filed: May 24, 1994
    Date of Patent: June 27, 1995
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Kazushi Nakata, Shigenori Matsushita, Shigeru Yamamoto, Shu h-uai Zhang, Satoru Nihsida