Patents by Inventor Yoshikazu Mada

Yoshikazu Mada 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).

  • Process for manufacturing a commutator
    Patent number: 4726113
    Abstract: A commutator for use with a DC motor or a DC generator. The parent metal of the segments of the commutator is formed with bulging portions which have their outer surfaces generally coextending with the outer surfaces of protecting portions for contacting with brushes. This commutator is manufactured by forming a cylinder of a plate of a conductive material, by forming a plurality of pawls on the circumference of the cylinder, by molding a boss of a synthetic resin in the cylinder, by forming a plurality of notches in one end of the cylinder, and by cutting the trunk of the cylinder into a plurality of slits to form a plurality of separate segments.
    Type: Grant
    Filed: November 19, 1986
    Date of Patent: February 23, 1988
    Assignee: Mitsuba Electric Manufacturing Co., Ltd.
    Inventors: Takashi Shibata, Nobuo Yamada, Yoshikazu Mada, Masaki Iizima
  • Molded commutator with enlarged diameter riser section
    Patent number: 4705977
    Abstract: A commutator for use with a DC motor or a DC generator. The parent metal of the segments of the commutator is formed with bulging portions which have their outer surfaces generally coextending with the outer surfaces of protecting portions for contacting brushes. This commutator is manufactured by forming a cylinder of a plate of a conductive material, by forming a plurality of pawls on the circumference of the cylinder, by molding a boss of a synthetic resin in the cylinder, by forming a plurality of notches in one end of the cylinder, and by cutting the trunk of the cylinder with a plurality of slits to form a plurality of separate segments.
    Type: Grant
    Filed: July 30, 1986
    Date of Patent: November 10, 1987
    Assignee: Mitsuba Electric Manufacturing Co., Ltd.
    Inventors: Takashi Shibata, Nobuo Yamada, Yoshikazu Mada, Masaki Iizima