ROLLER-CUTTER CORE DRILL BIT Russian patent published in 1994 - IPC

Abstract RU 2021468 C1

FIELD: well drilling. SUBSTANCE: side surfaces of shafts 3 have bevelled surfaces 7. Sum of angles between bevelled surfaces 7 and axles of shafts 3 and between end faces 7 and axles of shaft 3 and between end faces 6 and axles of shafts 3 is determined from the expression given in invention description. Pin 4 may be in form of screw with acute top 8. Angle σ at top 8 is equal to angle f EFFECT: higher wear resistance of body due to the fact shafts 3 do not rotate. 3 cl, 2 dwg

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RU 2 021 468 C1

Authors

Gotlib M.V.

Messer A.G.

Ehdel'Man Ja.A.

Dates

1994-10-15—Published

1991-06-28—Filed