US 12,276,197 B2
Tunnel excavation device
Naoki Sekiyama, Tokyo (JP); Hiroshi Asano, Tokyo (JP); Taku Arakawa, Tokyo (JP); Shinichi Terada, Tokyo (JP); and Eiichi Morioka, Tokyo (JP)
Assigned to KOMATSU LTD., Tokyo (JP)
Appl. No. 17/909,868
Filed by KOMATSU LTD., Tokyo (JP)
PCT Filed Feb. 26, 2021, PCT No. PCT/JP2021/007252
§ 371(c)(1), (2) Date Sep. 7, 2022,
PCT Pub. No. WO2021/192809, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 2020-058002 (JP), filed on Mar. 27, 2020.
Prior Publication US 2024/0200450 A1, Jun. 20, 2024
Int. Cl. E21D 9/10 (2006.01); E21D 9/11 (2006.01)
CPC E21D 9/1093 (2013.01) [E21D 9/112 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A tunnel excavation device comprising:
a front body portion configured to support a cutter head; and
a rear body portion movable relative to the front body portion, the rear body portion including
a rear main body disposed in a rear of the front body portion, and
a gripper portion provided on the rear main body to obtain a reaction force during excavation, the gripper portion including
a groove portion formed in a recess shape toward the rear main body, and
a wheel portion disposed in the groove portion, the wheel portion being moveable with the rear main portion relative to the front body portion.