Patents by Inventor David S. Riddle

David S. Riddle 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).

  • Roller hold down device
    Patent number: 4610582
    Abstract: A roller hold down device for removable work table which has a pair of rollers which extend transversely across the workpiece mounted on the movable table so as to hold it down and with a pair of cam roller members mounted on either side of the movable table and formed with cam portions so as to engage the rollers at the end of travel so as to force the rollers up away from the workpiece and also so as to prevent the rollers from falling off of the end of the workpiece. The rollers are controlled by hydraulic cylinders which can be actuated to automatically move them to the down position and also to move them to the up position.
    Type: Grant
    Filed: June 5, 1985
    Date of Patent: September 9, 1986
    Assignee: Stanwich Industries, Inc.
    Inventors: James R. Amos, Chester K. Greathouse, David S. Riddle
  • Roller hold down device
    Patent number: RE34125
    Abstract: A roller hold down device for removable work table which has a pair of rollers which extend transversely across the workpiece mounted on the movable table so as to hold it down and with a pair of cam roller members mounted on either side of the movable table and formed with cam portions so as to engage the rollers at the end of travel so as to force the rollers up away from the workpiece and also so as to prevent the rollers from falling off of the end of the workpiece. The rollers are controlled by hydraulic cylinders which can be actuated to automatically move them to the down position and also to move them to the up position.
    Type: Grant
    Filed: June 2, 1987
    Date of Patent: November 10, 1992
    Assignee: Stanwich Industries, Inc.
    Inventors: James R. Amos, Chester K. Greathouse, David S. Riddle