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. 14, 2025
Filed:
Feb. 25, 2021
Applicant:
Komatsu Ltd., Tokyo, JP;
Inventors:
Naoki Sekiyama, Tokyo, JP;
Hiroshi Asano, Tokyo, JP;
Taku Arakawa, Tokyo, JP;
Shinichi Terada, Tokyo, JP;
Eiichi Morioka, Tokyo, JP;
Assignee:
KOMATSU LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21D 9/10 (2005.12); E21D 9/11 (2005.12);
U.S. Cl.
CPC ...
E21D 9/1093 (2012.12); E21D 9/112 (2012.12);
Abstract
A tunnel excavation device includes a front body portion configured to support a cutter head and a rear body portion. The rear body portion includes a gripper carrier and a gripper portion. The gripper carrier is disposed in a rear of the front body portion. The gripper portion is provided on the gripper carrier. The gripper portion includes a groove portion and a wheel portion. The groove portion is formed in a recess shape toward the rear main body. The wheel portion is disposed in the groove portion.