MICROTUNNELLING SYSTEM AND APPARATUS
1 Assignment
0 Petitions
Accused Products
Abstract
A microtunnelling apparatus and system that includes an external drive system having rotational and linear thrust drive means, a drill head section having drill rotor and drill rod and connecting to intermediate drill rods allowing extension of the boring hole created by the drill head section driven by the drive system. The drill head includes a modular construction having a plurality of circular disc like elements, a bearing module, a steering module, a spacer module, and a mounting module, for axial alignment and abutment and mounting within a cylindrical steering shell. Directional steering of the drill head includes a plurality of substantially radially extending channels in steering module, each with an hydraulically movable protuberance movable by control means to redirect the outer steering casing and thereby redirect the drill head section mounted on the distal end of the drill rods.
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Citations
44 Claims
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1-37. -37. (canceled)
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38. A cutting apparatus for a drill head section, the cutting device comprising:
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a front cutting rotor having a central hub defining a central cavity that extends completely through the central hub and is adapter to receive a drill shaft, the central cavity having flats adapted to engage corresponding flats of the drill shaft to allow torque to be transferred from the drill shaft to the front cutting rotor, the front cutting rotor also including a plurality of cutting bars that project radially outwardly from the central hub, the cutting bars including surfaces at which a plurality of cutting teeth are mounted; and a front retainer that mounts at a front side of the front cutting rotor for retaining the front cutting rotor on the drill shaft, the front retainer including a front cutting surface and also including a rear internally threaded opening into which a threaded end portion of the drill shaft is threaded. - View Dependent Claims (39, 41, 42, 43, 44)
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Specification