Percent grade boring and monitoring apparatus

Details Percent grade boring and monitoring apparatus Percent grade boring and monitoring apparatus

1989-05-01

1991-05-14

Dang, Hoang C.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

33366, 175 61, 175 62, 175 73, E21B 706, E21B 47024

Patent

active

050147951

ABSTRACT:
An earth boring tool for forming a bore underground at a desired percent of grade and a grade sensor (A) for sensing percent of grade as the bore is formed are disclosed. The earth boring tool includes a pipe casing (10) and cutting head (12). Sensor (A) includes dielectric fluid chambers (30b, 32b) formed by chamber plates (30, 32) and a sandwiched capacitor plate (34). Capacitors (34a, 34b) are contacted by the dielectric fluid in the chambers. A differential capacitance signal is produced as a fluid level (80) variably covers and uncovers capacitors (34a, 34b) to produce a varying differential output signal. The differential output signal is converted into a linearly changing percent grade signal (64) by a conversion circuit (44a). The percent of grade signal is displayed on a monitor (C) by which an operator may steer the casing to a desired grade.

REFERENCES:
patent: 4042046 (1977-08-01), Capoccia
patent: 4438820 (1984-03-01), Gibson
patent: 4779353 (1988-10-01), Lopes et al.

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