Percussive mole boring device with electronic transmitter

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

E - Fixed Constructions

21

B

255/13

E21B 47/024 (2006.01) E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 7/26 (2006.01) E21B 47/01 (2006.01) E21B 47/022 (2006.01) E21B 47/12 (2006.01)

Patent

CA 1335097

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 transmit- ter 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 rotat- ing the cutting surface to a desired inclination and terminating rota- tion 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 sec- ond 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.

612100

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