Flow through raise boring bit

Details Flow through raise boring bit Flow through raise boring bit

1988-02-29

1989-05-23

Novosad, Stephen J.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

175325, 175357, E21B 1010, E21B 1020, E21D 300

Patent

active

048321354

ABSTRACT:
An improved raise boring bit to enhance cuttings removal and prevent accumulation of cuttings on the body of the bit, which utilizes a pair of radial rails and a plate connected with and strengthening the rails while defining an opening for the flow of cuttings beside the stem and the radial rails during boring. Cutter mounting means are disposed at intervals along the radial rails to permit the flow of cuttings between the rails and the mounting means. At least one wing extends radially from the plate for supporting additional cutters, a vertical stabilizer roller is mounted on the end of the wing and struts extend between adjacent sides of the wings for stability and support.

REFERENCES:
patent: 3858667 (1975-01-01), Goodfellow
patent: 4142598 (1979-03-01), Maxsted
patent: 4381038 (1983-04-01), Sugden
patent: 4456082 (1984-06-01), Harrison
patent: 4697652 (1987-10-01), Walk

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