Boring tool having electromagnetic wave generation capability

Details Boring tool having electromagnetic wave generation capability Boring tool having electromagnetic wave generation capability

1991-10-01

1992-11-24

Bagnell, David J.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

324346, 405184, E21B 704, E21B 47024

Patent

active

051654903

ABSTRACT:
A boring head for boring the ground includes a housing of substantially cylindrical configuration. An electric power source, a coil, a switch and an oscillator are mounted within the housing. The coil generates an electromagnetic wave, and the oscillator is connected with the power source, the coil and the switch. The switch is operable to be switched according to an angular position of the housing in a circumferential direction as to whether the angular position is within a predetermined range. The configuration of the electromagnetic wave generated by the coil can be changed through the switch according to the angular position of the housing.

REFERENCES:
patent: 3746106 (1973-07-01), McCullough et al.
patent: 4787463 (1988-11-01), Geller et al.
patent: 4907658 (1990-03-01), Stangl et al.
patent: 5002137 (1991-03-01), Dickinson et al.

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