Reamer bit for raise boring

Details Reamer bit for raise boring Reamer bit for raise boring

1978-09-05

1980-10-21

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175 53, 175361, E21B 922

Patent

active

042288630

ABSTRACT:
A reamer bit for raise boring in rock, of the type comprising a body on which a number of rolling cutters with cutting inserts are rotatably mounted for contact with and disintegration of the rock, and a detachable stem mounted in a central bore on the body and adapted to be received in a pilot hole drilled in advance in the rock. The stem has two cylindrical portions, an upper one of which having a smaller diameter than a lower one thereof. The bore in the body has corresponding upper and lower cylindrical portions surrounding the stem. The upper cylindrical portions of the body and the stem define upper stem restraining surface means. The lower cylindrical portions of the body and the stem define lower stem restraining surface means. The stem at its lower portion is provided with a flange abutting the body from below and supporting it axially. The upper and lower restraining surface means together comprise a substantial axial portion of the part of the stem that is surrounded by the bore. The corresponding surrounding portions of the bore in the body form a close fit with the cylindrical portions on the stem.

REFERENCES:
patent: 3191936 (1965-06-01), Guier
patent: 3512808 (1970-05-01), Graham
patent: 3857642 (1974-12-01), Miller
patent: 3917009 (1975-11-01), Dyer et al.
patent: 4007799 (1977-02-01), Dixon et al.
patent: 4011019 (1977-03-01), McDonald et al.

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