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. 02, 1993
Filed:
Jan. 06, 1992
Toshio Akesaka, Kanagawa, JP;
Kazuto Hamada, Tokyo, JP;
Kabushiki Kaisha Iseki Kaihatsu Koki, Tokyo, JP;
Penta-Ocean Construction Co. Ltd., Tokyo, JP;
Abstract
A rectangular shield excavating machine comprises a quadrangularly tubular shield body having a space for receiving an excavated matter at the front end, a rotor disposed in the space so as to be capable of being rotated onward and backward angularly around an axis extending in the direction orthogonal to a pair of facing exterior portions of the body, and excavating means disposed in the body, drive means for rotating onward and backward the rotor angularly around the axis, and for driving the excavating means. Large gravels contained in the excavated matter are crushed by being put between the rotor and a member defining the space with the rotationally reciprocating motion of the rotor.