Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Sectional guide or shaft having means to lock sections in...
Patent
1981-09-18
1983-08-02
Purser, Ernest R.
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
Sectional guide or shaft having means to lock sections in...
175 61, 92 71, E21B 708
Patent
active
043960731
ABSTRACT:
An underground boring apparatus including a forwardmost boring head is disclosed herein along with a particular technique for guiding the boring head through the earth along both linear and non-linear paths. In a specific embodiment, the apparatus utilizes an elongated shaft arrangement supporting the boring head at its front end and a tubular housing supporting an intermediate segment of said shaft arrangement for pivotal movement about one of a number of different axes whereby to cause the boring head to pivot relative to the housing. An arrangement of piston/cylinder units is disposed within the housing for pivoting the shaft arrangement in a controlled fashion whereby to determine the direction of movement of the boring head through the earth. This arrangement of piston/cylinder units not only serves to maintain the shaft arrangement and boring head in a pivoted position for causing the latter to move in a curved path, but also serves to maintain the shaft arrangement and boring head in coaxial relationship with the tubular housing for causing the boring head to follow a straight line path.
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Kelley Douglas P.
Reichman James M.
Bui Thuy M.
Electric Power Research Institute Inc.
Purser Ernest R.
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