Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent
1981-03-16
1983-05-17
Smith, James G.
Tool driving or impacting
Drive controlled by relative axial movement of tool
Drive motor controlled
91234, 175 92, E21C 320, E21C 324
Patent
active
043835813
ABSTRACT:
A tool for cutting percussive rotary drilling of boreholes includes a hollow casing having a bit. A hammer piston is installed in the casing for reciprocations and for cooperation with the bit for imparting impact impulses thereto. The hammer piston divides a working space of the casing into a workstroke chamber and a return stroke chamber which are alternately connected through distribution means provided in the casing with a source of a fluid under pressure for reciprocations of the hammer piston. There are provided controlled throttling means in permanent communication with distribution means which can be set to two limit positions, so that in the first position they provide for a partial supply of a fluid for reciprocations of the hammer piston with minimum kinetic energy and in the second position the throttling means are completely closed so as to provide for the full supply of a fluid to the workstroke and return stroke chambers through the distribution means for reciprocations of the hammer piston at maximum kinetic energy. There are provided control means which are coupled to the bit and to the controlled throttling means for setting them to the first position when the bit encounters a soft rock and to the second position when the bit encounters a hard rock.
REFERENCES:
patent: 3216510 (1965-11-01), Briden
patent: 3446291 (1969-05-01), Judd et al.
patent: 4305473 (1981-12-01), Gidlund
Butkin Vladimir D.
Petukhov Vadim D.
Shalashov Jury F.
Adolphson K. Bradford
Smith James G.
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