Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Patent
1974-12-30
1976-09-28
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Plural separable cutter elements
175215, 175404, 175412, 175418, E21C 1300
Patent
active
039825965
ABSTRACT:
A rotary percussion bit comprises a body having at its upper end a threaded pin adapted to mate with a length of dual conduit drill stem. A plurality of down flow passages for air or other drilling fluid are near the periphery of the body. Inwardly of the down flow passages is an upflow passage. Channels across the lower face of the body connect the down flow and upflow passages. Over the bottom face of the body are located interior boring elements. The face is preferably concave, comprising a plurality of annular steps. At the lower end of the body is disposed a ring on the flat bottom of which are located gage and near gage boring elements. The ring extends down below the outer periphery of the bottom face of the body of the bit. The ring is secured to the body by quick attachable and detachable means in the form of an epoxy cemented straight threaded rotary shouldered connection, the ring having a bevelled lip extending upwardly around the bit body. The outer peripheries of the lip and ring are protected by wear resistant material, which may be hard weld metal or flat ended tungsten carbide inserts. Preferably the boring elements of the body and ring are tungsten carbide inserts.
REFERENCES:
patent: 1547461 (1925-07-01), Steele
patent: 2708105 (1955-05-01), Williams
patent: 2708566 (1955-05-01), Caldwell
patent: 3269470 (1966-08-01), Kelly
patent: 3389761 (1968-06-01), Ott
patent: 3471177 (1968-10-01), Garrett et al.
patent: 3628616 (1971-12-01), Neilson
patent: 3640352 (1972-02-01), Stuart
Favreau Richard E.
Purser Ernest R.
Robinson Murray
Smith International Inc.
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