Patents by Inventor William David Stone

William David Stone 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).

  • Yarn tensioning means for tufting machines
    Patent number: 4018171
    Abstract: A tufting machine having corrugated yarn tension rolls for pulling out the slack from the yarn. The tension rolls are mounted in pairs and supported at their ends in bearing brackets. The pair of brackets at each end of the roll pair are hinged together so that one may be pivoted relative to the other. A quick release clamping member preferably having an expandable diameter pin and a cam handle connect each pair of brackets together and act to rapidly disconnect them upon turning of the handle. An adjustable screw is provided to adjust the separation between the rolls.
    Type: Grant
    Filed: September 29, 1976
    Date of Patent: April 19, 1977
    Assignee: The Singer Company
    Inventors: William David Stone, Alvin Truit Bonner, Sr.