Patents Represented by Attorney Eric Michelson
  • Patent number: 3942351
    Abstract: While performing an ironing operation (a specific kind of drawing operation) on a hollow workpiece by means of a mandrel or punch and a die, the workpiece is caused to leave the die at a speed exceeding the speed of the mandrel, and the resulting forward slip with respect to the mandrel is controlled. The required mandrel stroke is reduced. Stripping of the workpiece from the mandrel may be started while the workpiece is still in motion relative to the mandrel.
    Type: Grant
    Filed: September 26, 1974
    Date of Patent: March 9, 1976
    Inventor: Betzalel Avitzur