Patents Assigned to David Edis
  • Patent number: 5409334
    Abstract: A vacuum vice for holding a bowling ball when drilling holes or engraving the ball includes inner and outer o-rings seals which form two vacuum chambers that work together to form a seal with a bowling ball having surface imperfections or engraving. The inner vacuum chamber holds the ball to a buoyant cup. The outer vacuum chamber seats the ball against a contoured, hard rim surface and is connected by a leakage path around the inner seal to a piston chamber which pulls on the buoyant cup to further seat the ball. The outer seal is mounted on a movable housing that automatically adjusts to the size of the ball.
    Type: Grant
    Filed: August 26, 1994
    Date of Patent: April 25, 1995
    Assignee: David Edis
    Inventors: David Edis, Bert Poort