Taper lock removable stem for raise bit

Details Taper lock removable stem for raise bit Taper lock removable stem for raise bit

1976-01-19

1976-11-23

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175 53, E21B 924, E21C 2300

Patent

active

039931471

ABSTRACT:
A raise bit for enlarging a pilot hole into a larger diameter hole by disintegrating the earth formations that surround the pilot hole is provided with a removable drive stem. The removable drive stem allows the raise bit to be transported through small passages and helps extend the useful lifetime of the bit. The bit may be assembled without weakening the highly-stressed, heat-treated stem by welding. The raise bit body includes a multiplicity of rolling cutters for contacting and disintegrating the earth formations surrounding the pilot hole. A central opening extends through the bit body. The central opening includes an upward facing tapered surface. The lower end of the drive stem extends through the central opening. A downward facing tapered surface on the drive stem mates with the upward facing tapered surface on the bit body. The lower end of the drive stem is threaded to receive a threaded nut which draws the tapered surfaces together.

REFERENCES:
patent: 1472565 (1923-10-01), Manning
patent: 1941217 (1933-12-01), McKinless, Jr.
patent: 1944076 (1934-01-01), Giesey
patent: 2034074 (1936-03-01), Wright
patent: 2446795 (1948-08-01), Trimble
patent: 2739791 (1956-03-01), Dimitrieff
patent: 2759705 (1956-08-01), Bjorkman
patent: 3750767 (1973-08-01), Pessier
patent: 3866698 (1975-02-01), Stanley
patent: 3917009 (1975-11-01), Dyer et al.
patent: 3920089 (1975-11-01), Mitchell

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