Method and device for percussion earth drilling

Details Method and device for percussion earth drilling Method and device for percussion earth drilling

1986-11-06

1987-10-13

Novosad, Stephen J.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

175296, 173 10, 173 20, 173 21, 91392, E21B 4400, E21B 414, B23Q 5033, E21C 304

Patent

active

046992235

ABSTRACT:
In percussion drilling such as earth drilling, a hammer piston driven by pressure medium is axially reciprocally movable in a drill body to transfer impact energy to a drill shank connectable to a drill bit. The axial position of the drill shank in the drill body is monitored, and the impact energy of the hammer piston is varied as a function of said position. For this purpose a sensor in the drill body produces a signal corresponding to the axial position of the drill shank in the drill body. By means of a control valve, the signal is used to control the pressure of the pressure medium actuating the hammer piston, thereby varying the impact energy.

REFERENCES:
patent: 3154158 (1964-10-01), Lincoln
patent: 3721095 (1973-03-01), Chelminski
patent: 3780814 (1973-12-01), Herb
patent: 3995700 (1976-12-01), Mayer et al.
patent: 4006783 (1977-02-01), Granholm
patent: 4227442 (1980-10-01), Oguni et al.
patent: 4429751 (1984-02-01), Jackson et al.

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