Patents by Inventor Mikio Nagasaka

Mikio Nagasaka 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).

  • Commutator and method of manufacturing the same
    Patent number: 5124609
    Abstract: A commutator includes a plurality of commutator segments disposed in circular configuration and equally spaced from each other in a circumferential direction. Each commutator segment has a contact portion for contact with a brush and an anchoring portion which forms a recess in cooperation with the contact portion. A ball made of insulation material is disposed between each two adjacent commutator segments in such a manner that ball is partly engaged with both recesses of adjacent commutator segments. A cylindrical hub made of synthetic resin is molded with the anchoring portions of the commutator segments and the balls.
    Type: Grant
    Filed: May 29, 1991
    Date of Patent: June 23, 1992
    Assignee: Makita Corporation
    Inventor: Mikio Nagasaka