Patents by Inventor Charles A. Hunter, II

Charles A. Hunter, II 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).

  • Hoist drum drive control
    Patent number: 4136855
    Abstract: A hoist drum drive control is provided with both variable displacement and fixed displacement motors geared to the drum and connected in parallel to a variable displacement pump. During high speed hoisting the variable displacement motor is shifted to zero displacement until the back pressure reaches a certain level at which time the displacement is automatically increased until a balanced condition is achieved. When lowering heavy loads a feedback to the variable pump decreases its displacement to prevent over speeding the engine.
    Type: Grant
    Filed: December 3, 1976
    Date of Patent: January 30, 1979
    Assignee: The Manitowoc Company Inc.
    Inventors: James G. Morrow, Sr., David J. Pech, Charles A. Hunter, II
  • Apparatus for raising & lowering a mast and boom on a mobile crane
    Patent number: 4050586
    Abstract: A self-erecting mast and boom for a lift crane including self-storing mast cylinders for erecting the mast and rotating a pivoted boom carrier into position to receive the boom which may then be raised by the boom hoist mechanism of the crane. A back hitch assembly including hydraulic cylinders is employed to initially raise the mast and the gantry members which may be lowered into horizontal position to reduce the crane profile for self-propelled transport between job sites.
    Type: Grant
    Filed: October 23, 1975
    Date of Patent: September 27, 1977
    Assignee: The Manitowoc Company, Inc.
    Inventors: James G. Morrow, Sr., David J. Pech, Charles A. Hunter, II, Kenneth J. Porubcansky