Patents by Inventor Zwaaftink Groot

Zwaaftink Groot 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).

  • Punching machine with controlled punch and die positioning and controlled punch operating stroke
    Patent number: 5136521
    Abstract: A punching machine has a punch holder driven under the influence of a first control device and a second control device for adjusting a die holder in height relative to a supporting face for sheet type material to be worked. There are measuring devices producing a first data signal representing the height of the die to be used, a second data signal representing the height of the punch to be used and a third data signal representing the thickness of the material to be worked.
    Type: Grant
    Filed: September 6, 1990
    Date of Patent: August 4, 1992
    Assignee: Holding M. Brouwer & Co. B.V.
    Inventors: Peter van Daalen, Zwaaftink Groot