Patents by Inventor Michael W. David

Michael W. David 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).

  • Drive mechanism for a hemming apparatus
    Patent number: 5086638
    Abstract: A drive mechanism for a hemming apparatus includes a pneumatic cylinder pivotally mounted to a frame which is suspended from a bed on which the workpiece can be positioned. The reciprocating shaft of the pneumatic cylinder is pivotally connected to the knee of a toggle joint. One end of the toggle joint is pivotally connected to the frame, and the other end of the toggle joint is pivotally connected to a lever. The fulcrum of the lever is pivoted on the frame, and the other end of the lever is connected to a draw rod. The draw rod is adapted to pull a movable member into operative engagement with the workpiece in one or two stages to complete the hem.
    Type: Grant
    Filed: April 9, 1991
    Date of Patent: February 11, 1992
    Assignee: Link Special Machinery, Inc.
    Inventor: Michael W. David