Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Patent
1991-07-16
1994-05-03
Britts, Ramon S.
Boring or penetrating the earth
Automatic control
Of boring means including a below-ground drive prime mover
175 45, 175 55, 175 56, 175 62, 175106, 1753252, 418 48, 418 49, E21B 4400, E21B 400, E21D 1000
Patent
active
053078853
ABSTRACT:
An attitude control device has a plurality of harmonic drive mechanisms of the hollow type, preferably first and second harmonic drive mechanisms. First and second rotational members are connected to the outputs of the first and second harmonic drive mechanisms. These rotational members have eccentric hollow portions which rotate eccentrically around the rotational axes of the harmonic drive mechanisms. A member to be driven is placed to extend through the eccentric hollow portions such that it is supportedly contacted with the inner surfaces of the eccentric hollow portions. In operation, the eccentric hollow portions are rotated relative to each other, whereby the member to be driven is controllably oriented to a desired direction.
The attitude control device can be employed as a drilling-direction control device wherein a rotational drill shaft is supported by inner surfaces of eccentric hollow portions of first and second rotational members. These rotational members are rotated by first and second harmonic drive mechanisms. By rotating the eccentric hollow portions, the rotational drilling shaft is changed in orientation from the vertical direction.
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Ikeda Akio
Kiyosawa Yoshihide
Kuwana Shoji
Britts Ramon S.
Harmonic Drive Systems Inc.
Schoeppel Roger J.
Sumitomo Metal Industries Ltd.
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