Patents by Inventor Hiromu Hama

Hiromu Hama 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).

  • Apparatus which comes in contact with molten metal and composite member and sliding structure for use in the same
    Patent number: 5634977
    Abstract: The invention relates to a molten metal plating apparatus comprising a roller rotatably supported by a bearing in a molten metal bath, the roller having a shaft sliding portion, the bearing having a sliding portion, both the shaft sliding portion and the sliding portion being made of ceramic sintered body, at least one of both the shaft of the roller and the bearing being made of a ceramic sintered body containing a solid lubricating material. The invention also relates to a die casting machine having a sleeve and a plunger tip both made of ceramic sintered bodies at least one of which contains a solid lubricating material. The bearing for the roller, the sleeve and the tip may be formed of a composite body having a ceramic sintered body portion and and a metal portion secured and fitted thereto by an intermediate member which is elastically and plastically deformed at the time of the usage. The composite structure formed by fitting is usable for other applications.
    Type: Grant
    Filed: July 13, 1994
    Date of Patent: June 3, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Takahiko Ookouchi, Hiromi Kagohara, Hiromu Hama, Mitsuo Nakagawa, Hitoshi Okoshi, Yoshitaka Nakayama
  • Roller for use in molten metal bath
    Patent number: 5380264
    Abstract: A molten metal plating apparatus includes a roller rotatably supported by a bearing in a molten metal bath, the roller having a shaft sliding portion, the bearing having a sliding portion, both the shaft sliding portion and the sliding portion being made of ceramic sintered body, at least one of both the shaft of the roller and the bearing being made of a ceramic sintered body containing a solid lubricating material. The bearing for the roller, the sleeve and the tip may be formed of a composite body having a ceramic sintered body portion and and a metal portion secured and fitted thereto by an intermediate member which is elastically and plastically deformed at the time of the usage.
    Type: Grant
    Filed: December 30, 1992
    Date of Patent: January 10, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Takahiko Ookouchi, Hiromi Kagohara, Hiromu Hama, Mitsuo Nakagawa, Hitoshi Okoshi, Yoshitaka Nakayama
  • Apparatus which comes in contact with molten metal and composite member and sliding structure for use in the same
    Patent number: 5252130
    Abstract: The invention relates to a molten metal plating apparatus including a roller rotatably supported by a bearing in a molten metal bath, the roller having a shaft sliding portion, the bearing having a sliding portion, both the shaft sliding portion and the sliding portion being made of ceramic sintered body, at least one of both the shaft of the roller and the bearing being made of a ceramic sintered body containing a solid lubricating material. The invention also relates to a die casting machine having a sleeve and a plunger tip both made of ceramic sintered bodies at least one of which contains a solid lubricating material. The bearing for the roller, the sleeve and the tip may be formed of a composite body having a ceramic sintered body portion and and a metal portion secured and fitted thereto by an intermediate member which is elastically and plastically deformed at the time of the usage. The composite structure formed by fitting is usable for other applications.
    Type: Grant
    Filed: September 17, 1990
    Date of Patent: October 12, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Takahiko Ookouchi, Hiromi Kagohara, Hiromu Hama, Mitsuo Nakagawa, Hitoshi Okoshi, Yoshitaka Nakayama