Patents Assigned to Hans-Peter Kampfer
  • Spring device
    Patent number: 5454549
    Abstract: Disclosed is a spring device which, during use in co-action with a deep-drawing device, is capable of causing the blank-holder pressure to decrease in proportion to the remaining material. The spring device holds substantially constant the blank-holder force per unit of surface area on the non-deformed material and is considered a "degressive" spring wherein the reaction force exerted by the spring decreases as the displacement between the ends of the spring increases.
    Type: Grant
    Filed: October 26, 1993
    Date of Patent: October 3, 1995
    Assignee: Hans-Peter Kampfer
    Inventor: Paul J. Ten Dam