Patents by Inventor Hiromichi Shiroma

Hiromichi Shiroma 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).

  • Rockbolts made of steel pipes
    Patent number: 7927043
    Abstract: A sleeve 10 for introduction of a pressurized fluid, which is attached to a rockbolt main body 1, comprises a cylindrical projecting part 11 of a large diameter and a bearing-plate-holding part 12 of a diameter smaller than an aperture of a bearing plate 6. The projecting part 11 and the bearing-plate-holding part 12 preferably has the same inner diameter. When the rockbolt main body 1 is embedded in a bedrock or ground, the bearing plate 6 locates on an edge of a rockbolt-setting hole of the bedrock or ground, and the bearing-plate-holding part 12 extends through the bearing plate 6 into the rockbolt-setting hole. Since the projecting part 11 and the bearing plate 6 are disposed on a sprayed concrete layer, a projection height of the rockbolt is remarkably decreased. Consequently, lining concrete 8 is applied onto the sprayed concrete layer with ease, and the bedrock or ground is reinforced with high reliability.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: April 19, 2011
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Tatsurou Iwasaki, Masahiro Nakata, Hiromichi Shiroma, Tetsuo Itou, Kenji Ooshima, Hiroyuki Tanase, Takefumi Nakako, Takeyuki Yoshida, Toshiharu Kittaka
  • Rockbolts made of steel pipes
    Publication number: 20070081864
    Abstract: A sleeve 10 for introduction of a pressurized fluid, which is attached to a rockbolt main body 1, comprises a cylindrical projecting part 11 of a large diameter and a bearing-plate-holding part 12 of a diameter smaller than an aperture of a bearing plate 6. The projecting part 11 and the bearing-plate-holding part 12 preferably has the same inner diameter. When the rockbolt main body 1 is embedded in a bedrock or ground, the bearing plate 6 locates on an edge of a rockbolt-setting hole of the bedrock or ground, and the bearing-plate-holding part 12 extends through the bearing plate 6 into the rockbolt-setting hole. Since the projecting part 11 and the bearing plate 6 are disposed on a sprayed concrete layer, a projection height of the rockbolt is remarkably decreased. Consequently, lining concrete 8 is applied onto the sprayed concrete layer with ease, and the bedrock or ground is reinforced with high reliability.
    Type: Application
    Filed: July 29, 2004
    Publication date: April 12, 2007
    Applicant: Nisshin Steel Co.,LTD
    Inventors: Tatsurou Iwasaki, Masahiro Nakata, Hiromichi Shiroma, Tetsuo Itou, Kenji Ooshima, Hiroyuki Tanase, Takefumi Nakako, Takeyuki Yoshida, Toshiharu Kittaka