Patents Examined by K. Imayoshi E. Tamai
  • Patent number: 6051902
    Abstract: A magnetic attraction driving engine utilizing a permanent magnet is provided with a permanent magnet, an electromagnet formed by winding a coil on a magnetic core with one end thereof stuck to one magnetic pole end of the permanent magnet, an excitation controller for exciting the electromagnet to change a state of magnetic fluxes in the vicinity of the magnetic pole end of the permanent magnet, a movable member having magnetic attractivity set in the vicinity of the magnetic pole end of the permanent magnet by being supported and guided so as to be capable of coming close to or separating away from the permanent magnet and a returning force applying member for causing by pressure the movable member to retreat against a magnetic attracting force and move back and forth by changing a magnetic attracting force of the permanent magnet.
    Type: Grant
    Filed: November 19, 1998
    Date of Patent: April 18, 2000
    Inventors: Sanshiro Ogino, Keiichiro Asaoka
  • Patent number: 5929544
    Abstract: A drain structure for a fan motor prevents water from entering a discharge hole in the casing of the fan motor. A guiding passage is in opposed relation to the discharge hole and includes a front end portion covered by a fan boss section and an outer rib to prevent water from entering through the discharge hole into the casing. The guiding passage receives water discharged from the discharge hole. The discharge hole is formed in a lower portion of a casing cylindrical section. The casing cylindrical section is mounted on a fitting bracket for securement to a radiator.
    Type: Grant
    Filed: December 9, 1996
    Date of Patent: July 27, 1999
    Assignee: Mitsuba Corporation
    Inventors: Hirohiko Maekawa, Masaei Sato
  • Patent number: 5811903
    Abstract: A motor comprises a motor rotation shaft, a first thrust bearing which supports one end of the motor rotation shaft and a second thrust bearing which supports the other end of the motor rotation shaft to control positioning in a thrust direction of the motor rotation shaft. The first thrust bearing further comprises a bearing for supporting one end of the motor rotation shaft and is movable in a shaft direction of the motor rotation shaft, a guide member for guiding the movement of the bearing in the shaft direction and a plurality of pre-loaded elements for opposing the force generated by the bearing in the shaft direction. The pre-loaded elements are evenly spaced around the motor shaft.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: September 22, 1998
    Assignee: Sankyo Seiki Mfg. Co., Ltd.
    Inventors: Toshio Ueno, Fujio Iwashita, Toshio Yamamoto, Shigeru Ozawa