Patents by Inventor Etsuo Mayumi

Etsuo Mayumi 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).

  • Miniature motor having a built-up commutator
    Patent number: 5272404
    Abstract: A commutator has such a construction that a flange having an outside diameter larger than the outside diameter of a cylindrical body is provided integrally with the cylindrical body in the vicinity of one end of the cylindrical body; guide grooves formed in a circular arc shape in cross section are provided on the flange at the boundary of the flange to the cylindrical body; engaging pieces passing through the guide grooves are provided on one end of a commutator segment; and engaging pieces are caused to deform plastically to fixedly fit the engaging pieces to the flange.
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: December 21, 1993
    Assignee: Mabuchi Motor, Co., Ltd.
    Inventors: Toshiya Yuhi, Michio Hoshino, Toru Yano, Hideo Tamura, Isamu Serizawa, Etsuo Mayumi, Takashi Ushiku, Takeshi Okumura, Kouichi Koide
  • Miniature motor
    Patent number: 4853576
    Abstract: A miniature motor having a motor case comprising a motor housing, fitted with a permanent magnet field and having an opening at one end thereof; an insulating brush base, made of a synthetic resin, fitted to the opening of the motor housing for holding brushgear; and a cover plate, made of a metallic member, covering the surface of the insulating brush base; the motor housing having a plurality of crimping pieces formed by notching the edge of the motor housing opening; the cover plate being fitted to the motor housing by engaging the cover plate with the motor housing opening, and bending and crimping the crimping pieces, characterized in that the cover plate has along the outer periphery thereof a plurality of recesses, which are concave toward the motor shaft, and the recesses are crimped by means of the crimping pieces so as to fixedly fit the cover plate to the motor housing.
    Type: Grant
    Filed: April 13, 1987
    Date of Patent: August 1, 1989
    Assignee: Mabuchi Motor Co., Ltd.
    Inventors: Etsuo Mayumi, Kunio Hiromasa
  • Miniature motor
    Patent number: 4806811
    Abstract: A miniature motor having a cup-shaped cylindrical motor case fitted with a plurality of motor mounting holes and a bearing on the closed end face thereof, and a rotor rotatably supported at one end of the shaft thereof in the motor case by the bearing provided on the closed end face of the motor case, a motor mounting portion is provided around motor mounting holes in a raised fashion from the closed end of the motor case so that the surface of the motor mounting portion intersects with the shaft at substantially 90 degrees. Also, a miniature motor in which the surface of the motor mounting portion is ground and polished is disclosed.
    Type: Grant
    Filed: January 8, 1987
    Date of Patent: February 21, 1989
    Assignee: Mabuchi Motor Co. Ltd.
    Inventors: Etsuo Mayumi, Michio Hoshino, Mitsu Kase