Reamer bit for raise boring

Details Reamer bit for raise boring Reamer bit for raise boring

E - Fixed Constructions

21

B

255/75

E21B 10/00 (2006.01) E21B 7/28 (2006.01) E21B 17/046 (2006.01) F16D 1/076 (2006.01)

Patent

CA 1078819

REAMER BIT FOR RAISE BORING Abstract of the Disclosure A reamer bit for raise boring in rock comprises a body on which a number of rolling cutters with cutting inserts are rotatably mounted for contact with and disintegration of the rock. A detachable stem is 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 having two cylindrical portions the upper of which has a smaller diameter, the bore in the body having corresponding cylindrical portions surrounding the stem. The stem at its lower part is provided with a flange abutting the body from below and thus carrying it axially, the two cylindrical portions of the stem and/or the bore together comprising 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 forming a precise fit, for instance a sliding fit, with the cylindrical portions on the stem.

310740

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