Boring or penetrating the earth – Boring without earth removal
Patent
1985-04-05
1986-12-30
Leppink, James A.
Boring or penetrating the earth
Boring without earth removal
173 91, 175 26, 175 61, 175 73, 175 94, E21B 406, E21B 706, E21B 726, E21B 4400
Patent
active
046321918
ABSTRACT:
A steering system is disclosed for percussion boring tools for boring in the earth at an angle or in a generally horizontal direction. The steering mechanism comprises a slanted-face nose member attached to the anvil of the tool to produce a turning force on the tool and movable tail fins incorporated into the trailing end of the tool which are adapted to be selectively positioned relative to the body of the tool to negate the turning force. The fins are constructed to assume a neutral position relative to the housing of the tool when the tool is allowed to turn and to assume a spin inducing position relative to the housing of the tool to cause it to rotate when the tool is to move in a straight direction. Turning force may also be imparted to the tool by an eccentric hammer which delivers an off-axis impact to the tool anvil. For straight boring, the tail fins are fixed to induce spin of the tool about its longitudinal axis to compensate for the turning effect of the slanted nose member or eccentric hammer. When the fins are in the neutral position, the slanted nose member or the eccentric hammer will deflect the tool in a given direction. The fins also allow the nose piece to be oriented in any given plane for subsequent steering operation.
REFERENCES:
patent: 3137483 (1964-06-01), Zinkiewiez
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patent: 3525405 (1970-08-01), Coyne et al.
patent: 3529682 (1970-09-01), Coyne et al.
patent: 3630295 (1971-12-01), Coyne et al.
patent: 3794128 (1974-02-01), Gagen et al.
patent: 3952813 (1976-04-01), Chepurnoi et al.
Cohen John H.
Givler Gregory C.
Maurer William C.
McDonald William J.
Pittard Gerard T.
Dang Hoang C.
Gas Research Institute
Leppink James A.
Mosely Neal J.
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