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:
Jul. 23, 1996
Filed:
Mar. 22, 1995
Toshio Akesaka, Kanagawa-ken, JP;
Kazuto Hamada, Tokyo, JP;
Kabushiki Kaisha Iseki Kaihatsu Koki, Tokyo, JP;
Abstract
A shield excavator for constructing a tunnel, a hole, a groove and the like having a polygonal, preferably, square section. The excavator (10) comprises: a cylindrical shield body (12) having a polygonal sectional shape; a cutter assembly (18) disposed at a front end portion of the shield body (12) so as to be reciprocatingly movable in a first direction intersecting at least the axis of the shield body (12); and a driving mechanism (16) for driving the the cutter assembly (18). The cutter assembly (18) includes: a plurality of serrated cutters (66) disposed at the front end of the shield body (12) at intervals in a second direction intersecting the axis of the shield body (12) and the first direction and extending in the first direction, or a plurality of plate-shaped cutters (68) disposed at the front end of the shield body (12) at intervals in the first direction and extending in the second direction.