Patents by Inventor James M. Ronning

James M. Ronning 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: 7134701
    Abstract: A lift frame adapted to be pivotally mounted on a hoist include a tubular sleeve guide that guides a lift slide. The lift slide carries a lift frame for supporting a load such as a beam or truss to be lifted, and is spring loaded in an upward direction by a spring extending between a slider tube and the lift frame. The spring keeps the bracket seated on the load for a limited distance along the lift path. The lift slide has a stop that limits the amount of downward movement of the lift slide relative to the guide as the load is lifted. Specifically, a pair of frames are mounted at opposite ends of a spreader bar for lifting an elongated beam. A bracket on each lift slide engages one end of the beam and supports it under spring load for a selected amount of vertical travel, and thereafter the beam or load is directly lifted mechanically by having the stop on the lift slide engaging the sleeve guide.
    Type: Grant
    Filed: December 30, 2003
    Date of Patent: November 14, 2006
    Inventor: James M. Ronning