Percussive mole boring device with electronic transmitter

Details Percussive mole boring device with electronic transmitter Percussive mole boring device with electronic transmitter

1988-09-29

1990-03-13

Kisliuk, Bruce M.

Boring or penetrating the earth

Boring without earth removal

175 45, E21B 47024, E21B 4709

Patent

active

049076582

ABSTRACT:
A percussive mole boring device with a location transmitter is disclosed. The transmitter is located in a forward end of a drilling assembly attached to a mole to accurately transmit the location of a boring element or cutting surface to surface detector. The transmitter is surrounded on each end by isolator means which protect the transmitter from damage due to shock created by the percussive device, e.g., a hammer driven by compressed air. In one embodiment the transmitter is located beneath a single window transparent to the transmission frequency, and the cutting surface of the bore is angled. Therefore, the travel direction of the mole can be controlled by rotating the cutting surface to a desired inclination and terminating rotation during forward motion for a short period. The mole travels in a straight path during ordinary travel due to rotation. In a second embodiment, the transmitter is located beneath three equiangularly displacent windows to create a continuous field for detection. This type of mole is not steerable and includes a boring element with a non-angled edge. In a third embodiment which is similar to the second embodiment, the windows are not present, and a transmitter coil is wound in an external groove of the drilling assembly and is covered by epoxy.

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