Patents by Inventor Kiyoyasu Ohkawa

Kiyoyasu Ohkawa 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).

  • Press for manufacturing helical gears
    Patent number: 4770572
    Abstract: A press for manufacturing helical gears having a punch with a cutting edge; a die with a cutting edge, one of the cutting edges being shaped as a helical gear and the other having a shape corresponding to the shape of the one cutting edge; and a bolster rotatable about an axis and provided with one of the die and the punch. The die and said punch are pressed together and the bolster is rotatably driven by a driving element in response to a lead of a helical gear to be manufactured. The stroke of the punch is detected and a desired rotation angle of a driving element is calculated and then signalled to the driving element.
    Type: Grant
    Filed: April 22, 1986
    Date of Patent: September 13, 1988
    Assignee: Amino Iron Works Co., Ltd.
    Inventors: Kiyoyasu Ohkawa, Masao Murakawa