Boring or penetrating the earth – With below-ground tool drive prime mover
Patent
1978-09-15
1979-08-07
Leppink, James A.
Boring or penetrating the earth
With below-ground tool drive prime mover
175325, E21B 704, E21B 1710
Patent
active
041634780
ABSTRACT:
A downhole rock drilling tool is described that is adapted to mount an impact drilling bit at a lower end and to be operatively connected to a drilling rod or string at an upper end. The tool includes a free floating pneumatic piston. Valving is provided to control movement of the piston to repeatedly hammer against the drill bit to force the tool downwardly through earth and rock. The present tool is intended to be utilized with bits that produce a hole having a diameter at least 7.5 centimeters greater than the tool diameter. A pair of alignment rings are situated at upper and lower ends of the tool housing and extend radially outward to peripheral surfaces that lie directly adjacent to the hole wall. The rings are spaced longitudinally to maintain the tool in proper alignment with respect to the central axis of the drilled hole. The rings are also fluted longitudinally to enable relatively free passage of air and earth material upwardly through the hole during drilling operations.
REFERENCES:
patent: 2589534 (1952-03-01), Buttolph
patent: 3419094 (1968-12-01), Bobo
patent: 3820611 (1974-06-01), King
patent: 3999618 (1976-12-01), Farris
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