The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 2011
Filed:
Jul. 29, 2004
Tatsurou Iwasaki, Fukuoka, JP;
Masahiro Nakata, Tokyo, JP;
Hiromichi Shiroma, Tokyo, JP;
Tetsuo Itou, Tokyo, JP;
Kenji Ooshima, Tokyo, JP;
Hiroyuki Tanase, Mie, JP;
Takefumi Nakako, Hyogo, JP;
Takeyuki Yoshida, Hyogo, JP;
Toshiharu Kittaka, Tokyo, JP;
Tatsurou Iwasaki, Fukuoka, JP;
Masahiro Nakata, Tokyo, JP;
Hiromichi Shiroma, Tokyo, JP;
Tetsuo Itou, Tokyo, JP;
Kenji Ooshima, Tokyo, JP;
Hiroyuki Tanase, Mie, JP;
Takefumi Nakako, Hyogo, JP;
Takeyuki Yoshida, Hyogo, JP;
Toshiharu Kittaka, Tokyo, JP;
Nisshin Steel Co., Ltd., Tokyo, JP;
Abstract
A sleevefor introduction of a pressurized fluid, which is attached to a rockbolt main body, comprises a cylindrical projecting partof a large diameter and a bearing-plate-holding partof a diameter smaller than an aperture of a bearing plate. The projecting partand the bearing-plate-holding partpreferably has the same inner diameter. When the rockbolt main bodyis embedded in a bedrock or ground, the bearing platelocates on an edge of a rockbolt-setting hole of the bedrock or ground, and the bearing-plate-holding partextends through the bearing plateinto the rockbolt-setting hole. Since the projecting partand the bearing plateare disposed on a sprayed concrete layer, a projection height of the rockbolt is remarkably decreased. Consequently, lining concreteis applied onto the sprayed concrete layer with ease, and the bedrock or ground is reinforced with high reliability.