DRILL STRING FOR MACHINES OF HORIZONTAL AND INCLINED DRILLING Russian patent published in 1995 - IPC

Abstract RU 2026977 C1

FIELD: hole drilling devices. SUBSTANCE: the sections of auger string which has interrupted flights are provided with spring helixes stretched between auger flights. Parts of spring helixes are rigidly connected on the side of nonworking surfaces to the ends of auger flights facing threaded bushings. EFFECT: increased efficiency of conveyance of drillings due to elimination of interruptions of auger flights. 2 cl, 1 dwg

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RU 2 026 977 C1

Authors

Safokhin M.S.

Mamet'Ev L.E.

Ivshin V.A.

Erin O.I.

Skornjakov N.M.

Anan'Ev A.N.

Dates

1995-01-20—Published

1991-07-05—Filed