Patents by Inventor James N. Williams

James N. Williams 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: 4530536
    Abstract: Lifting tongs for a crane include a pair of tong arms pivoted together adjacent their centers. A tension spring biases the tongs into a closed position and a pneumatic cylinder moves the tongs opened and closed. A pair of jaws are mounted to the lower ends of the tong arms. Each jaw includes a substantially horizontal slot and a vertical wall extends upwardly from the opening at the mouth of the slot. As the jaws are closing, the vertical walls guide the edges of the article to be lifted into the slots. Movable shims within the slots adjust the height of the slots so that the tongs can be used to lift articles of different sizes.
    Type: Grant
    Filed: January 19, 1984
    Date of Patent: July 23, 1985
    Inventor: James N. Williams
  • Patent number: 4452481
    Abstract: Lifting tongs for a crane include a pair of tong arms pivoted together adjacent their centers. A tension spring biases the tongs into a closed position and a hydraulic cylinder moves the tongs opened and closed. A substantially V-shaped jaw is mounted on the lower end of each tong arm and is pivotally adjustable to accommodate various size workpieces. An alternative pair of jaws for lifting cylindrical members such as logs is also provided.
    Type: Grant
    Filed: January 13, 1982
    Date of Patent: June 5, 1984
    Inventor: James N. Williams