Patents by Inventor Masayoshi Hashiura

Masayoshi Hashiura 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).

  • Long-sized tubular grounding container unit for gas-insulated electrical device and laser welding device for manufacturing the same
    Patent number: 5601735
    Abstract: A laser welding device for welding a long sized tubular grounding unit includes a work head arranged to rotate around an outer circumference of two tubular members to be welded, a laser oscillator, and apparatus to transmit the laser beam from the oscillator in sychronism with rotation of the work head. In one embodiment the apparatus to transmit the laser beam includes an optical fiber.
    Type: Grant
    Filed: April 13, 1993
    Date of Patent: February 11, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Hideo Kawamoto, Tokio Yamagiwa, Shinji Fukuda, Masayoshi Hashiura, Osamu Isshiki, Shigetaka Takeuchi, Masaki Murashita
  • Structure of metal container having trunk pipe and branch pipe, and manufacturing method and apparatus therefor
    Patent number: 5498849
    Abstract: A welded metal container for a sheath 1 or 1A of gas insulated switch gear comprises a trunk pipe 2, 21 and a branch pipes 3, 31, 32 welded to the trunk pipe 2,21 by arc welding A or laser beam welding LB and flanges welded to the each end portion of the trunk pipe 2, 21 and branch pipes 3, 31, 32 by the laser beam welding. After the arc welding A, the ends of trunk pipe 1, 21 and branch pipes 3, 31, 32 are machined precisely and flanges 4a, 4b, 4c, 4d, 4f and 4g are welded to the end portions of the trunk pipe 2, 21 and branch pipes 3, 31, 32.
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: March 12, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Osamu Isshiki, Masaki Murashita, Osamu Matsushima, Sadao Nakagawa, Seizo Nakano, Koji Goto, Masayoshi Hashiura, Yutaka Kobayashi, Takashi Satoh, Katsuro Ota, Hideaki Kikuchi, Takashi Sato, Shinji Fukuda
  • Structure of metal container having trunk pipe and branch pipe, and manufacturing method and apparatus therefor
    Patent number: 5444206
    Abstract: A method for manufacturing a welded metal container by first arc welding a branch pipe to a trunk pipe. The arc welding of the pipes together causes both of the pipes to be thermally deformed. The end surfaces of the pipes are then cut by a laser cutting or mechanical cutting process so that the ends of the trunk pipe are in parallel and perpendicular to the end of the branch pipe. Subsequently flanges are laser welded to the ends of the pipes without further thermally deforming the pipes. The metal container made by this process can be used as a sheath for a gas insulated switch gear.
    Type: Grant
    Filed: September 17, 1991
    Date of Patent: August 22, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Osamu Isshiki, Masaki Murashita, Osamu Matsushima, Sadao Nakagawa, Seizo Nakano, Koji Goto, Masayoshi Hashiura, Yutaka Kobayashi, Takashi Satoh, Katsuro Ota, Hideaki Kikuchi, Takashi Sato, Shinji Fukuda
  • Laser machining system
    Patent number: 4527043
    Abstract: In a laser machining system for the heat treatment of an object, a pair of cylindrical concave mirrors are used to receive a source laser beam and irradiate a linear laser beam on to the object. The system is further provided between the latter cylindrical mirror and the object with at least a pair of slant-type plane mirrors for conditioning the linear beam. The plane mirrors have means for variably making the lengthwise dimension of the output linear beam smaller than that of the incident linear beam, so that a linear laser beam of various lengthwise dimensions can be produced.
    Type: Grant
    Filed: February 17, 1984
    Date of Patent: July 2, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Masayoshi Hashiura, Akiyasu Okazaki, Sigeru Suzuki