Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Patent
1981-02-09
1983-09-27
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Plural separable cutter elements
175418, 175327, E21B 1062
Patent
active
044063369
ABSTRACT:
The device described herein comprises a bit for drilling oil wells, water wells, foundation sockets for bridges and buildings, air and utility shafts for mines, etc., which bit comprises an inner core or mandrel and an outer shell or exterior sleeve, which shell or sleeve is replaceable when worn. The inner core resembles in many features, the standard type of bit in present use in that the means for holding, supporting and driving the bit are similar to those in present practice, and has appropriate openings and means for blowing air and/or liquid through the bit to blast away rock dust and cuttings. The novelty of the new device resides in having a lower annular end of the core preferably slightly tapered inwardly toward the extreme end, and having fitted over this annular section a sleeve or shell whose inner surface is preferably also slightly tapered, corresponding in size and shape to and in close contact with the said annular section of the core thereby providing a tight fit. The lower exterior surface of this shell has small openings about 0.375-1.25 inches in diameter into which hard "compacts" preferably of tungsten carbide, are fitted. These compacts are rounded on the exposed end and are adapted to provide a grinding, cutting and chipping action against the rock or surface into which the bit is pressed and rotated. Grooves in the sides and bottom of the shell allow passage of dust and cuttings along with air and/or liquid which has been blasted through the interior openings of the core.
REFERENCES:
patent: 2631824 (1953-03-01), Annesley
patent: 3982596 (1976-09-01), Vetter
patent: 4244432 (1981-01-01), Rowley et al.
Smith-Williston, Inc., 3 Reasons Why S/W Drills Offer Higher Drilling Rates at a Lower Per Foot Cost, Nov. 16, 1973.
McGinnis William R.
Olsen Barbara H.
Olsen John K.
Bui Thuy M.
Monacelli Walter J.
Purser Ernest R.
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