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:
Mar. 09, 1999
Filed:
Jul. 01, 1997
Shigeaki Okuyama, Amagasaki, JP;
Teruo Kabeuchi, Amagasaki, JP;
Katsuhiko Mukuno, Amagasaki, JP;
Masaya Hattori, Amagasaki, JP;
Kazunori Tsujimoto, Amagasaki, JP;
Takashi Togawa, Amagasaki, JP;
Yukishige Yamada, Amagasaki, JP;
Masao Nakagawa, Amagasaki, JP;
Siro Sugiyama, Amagasaki, JP;
Kubota Corporation, , JP;
Abstract
An underground propelling method uses a propellant apparatus including a propellant head having a pressure receiving face portion inclined relative to an axis of the head and a plurality of propellant cylinders flexibly and pivotally connected in series to a rear end of the propellant head. The propellant apparatus is propelled under the ground by applying a thrust to the propellant apparatus from behind. Each propellant cylinder of the apparatus is pivotal about a single pivot axis thereof alone. The apparatus is propelled with the pressure receiving face portion thereof being oriented along a pivotal direction of the propellant cylinder about the pivot axis.