Patents by Inventor Horotaka Nishikawa

Horotaka Nishikawa 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).

  • Patent number: 4538441
    Abstract: In a redrawing-ironing apparatus provided with a punch fixed on a ram, a die means including a redrawing die and ironing dies, an annular piston for fastening the die means, a cup retained pad adapted to push the inner periphery of the bottom of a drawn cup placed on the redrawing die, and pins fixed on the annular piston and extending axially, the free end surface of the pin is engaged with the flange of the cup retainer pad at the end of the redrawing. As a result, the earing portions of the drawn cup can be prevented from being thinned and broken into fragments at the redrawing.
    Type: Grant
    Filed: June 12, 1984
    Date of Patent: September 3, 1985
    Assignee: Toyo Seikan Kaisha Limited
    Inventor: Horotaka Nishikawa