Boring or penetrating the earth – With tool shaft detail
Patent
1978-11-16
1980-05-13
Purser, Ernest R.
Boring or penetrating the earth
With tool shaft detail
175 53, 175344, 267137, 64 27NM, E21C 2300
Patent
active
042024170
ABSTRACT:
A raise bit is disclosed for enlarging a pilot hole into a larger diameter hole by disintegrating the earth formations surrounding the pilot hole. The raise bit includes a removable drive stem for enabling the raise bit to be transported through small drifts. The drive stem is attached to a thrust bearing plate which, in turn, is interconnected to a main bit body. The bit body extends around the drive stem and includes a plurality of rolling cutters for contacting and disintegrating the earth formations surrounding the pilot hole. The interconnection between the thrust bearing plate and the bit body is accomplished by means of an annular shock absorbing member made of polyurethane. The elastomeric shock absorbing member has a substantially toroidal configuration and is designed and dimensioned to transfer all of the thrust and torsional loads passing from the drive stem and thrust bearing plate to the bit body, while absorbing a large portion of the impact type loads acting on the drill.
REFERENCES:
patent: 3221619 (1965-12-01), Erickson
patent: 3451722 (1969-06-01), Scaravilli et al.
patent: 3819206 (1974-06-01), Aarons et al.
patent: 3866698 (1975-02-01), Stanley
patent: 4007799 (1977-02-01), Dixon et al.
Nichols Jr. Nick A.
Purser Ernest R.
Smith International Inc.
Vargo Robert M.
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