| 摘要 |
PROBLEM TO BE SOLVED: To provide a curve boring device capable of positively rotating a boring means at the front end of an outer pipe by transmitting the turning force of a shaft member to the boring means without causing torsion of the shaft member in the outer pipe formed in the same curvature as a curved hole. SOLUTION: The curve boring device 1 capable of boring the curved hole is provided with the outer pipe 2 formed in the same curvature as the curved hole; the boring means 3 arranged at the front end of the outer pipe 2; a linear boring shaft 10 rotatable around an axis within the outer pipe 2; and an extension shaft 20 rotatable around an axis within the outer pipe 2, with the front end connected in a bent state to the rear end of the boring shaft 10. A rear end gear 11 provided at the rear end of the boring shaft 10, and a front end gear 21 provided at the front end of the extension shaft 20 are engaged with each other to rotate the boring means 3 by the turning force of the extension shaft 20. COPYRIGHT: (C)2006,JPO&NCIPI |
