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:
Oct. 12, 1976
Filed:
Mar. 18, 1975
Kabushiki Kaisha Komatsu Seisakusho, Tokyo, JA;
Abstract
Tunnel excavator for forming an upper half annular hollow space in the solid earth. The excavator has an arch shaped shield provided with a plurality of chambers in which excavating machines are located. Each of the excavating machines is swingably supported in the respective chamber and gripper means for securely abutting against the outer and inner surfaces of the solid earth formed by the upper half annular hollow space is located in each of the chambers. Thrust generating means is connected between the respective excavating machines and the respective gripper means so that the excavating machines can be advanced by the action of the thrust generating means when the gripper means is actuated to abut against the earth.