Title:
【発明の名称】改良型誘導機能付き掘削装置
Document Type and Number:
Japanese Patent JPH09505646
Kind Code:
A
Abstract:
Boring apparatus for forming a generally horizontal underground passage in soil for a utility conduit or the like that includes a tool head with a base portion and a nose portion mounted on the base portion. The base portion is rotatable relative to the nose portion between a first position in which nose portion surfaces are symmetrical with respect to the tool axis so that the tool will move along a straight path and a second position in which nose portion surfaces are in asymmetrical position with respect to the tool axis so that said tool will move along a curved path. By application of torque to the base portion, the base portion is shifted relative to the nose portion to shift the tool head from between an asymmetrical configuration and symmetrical configuration. Torque generating surface structure interacts with the soil and generates clockwise torque in one tool head position and counter clockwise torque in the other tool head position.
Inventors:
Fisk Arenti
Freed David Eye
Man Thomas H
Freed David Eye
Man Thomas H
Application Number:
JP51504195A
Publication Date:
June 03, 1997
Filing Date:
July 26, 1994
Export Citation:
Assignee:
Foster mirror ink
International Classes:
E21B1/02; E21B7/04; E21B7/06; E21B7/26; E21D9/093; F16L1/024; (IPC1-7): E21B1/02; F16L1/024; E21D9/06; E21B7/04
Attorney, Agent or Firm:
Kenji Yoshida (2 outside)