Patents by Inventor William A. Kelso

William A. Kelso 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).

  • Patent number: 4978132
    Abstract: A pivotable hand truck for supporting or installing a heavy object is provided comprising an L-shaped structure, a pair of wheels secured to the L-shaped structure about which the structure may be pivoted between horizontal and vertical positions, and lifting means carried by the structure adapted to vertically adjust the object to a selected height above the floor surface. The lifting means is defined by a floor-engaging pedal affixed to the L-shaped structure, height-adjusting members carried by the structure, and activating means for activating the height-adjusting members when the pedal is moved between a non-operational position and an operational position. The activating means is defined by a rod member secured to the apparatus which engages the height-adjusting members, and coupling means mechanically coupling the rod member to the pedal. The coupling means is defined by a plurality of interconnecting lever arms, or, alternatively, a cable-and-pulley mechanism.
    Type: Grant
    Filed: September 14, 1989
    Date of Patent: December 18, 1990
    Inventors: P. Henry Wilson, William A. Kelso