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2 090 734

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IPC

(21) (22)

Application

5033325/03, 1992-03-19

(22)

Actual filing date

1992-03-19

(45)

Published

1997-09-20

(72)

Inventor

Shamshin V.N.Jakimov V.P.Gavrilov V.A.Brezhitskij V.P.Dul'Tsev I.M.Marchuk A.I.Gashkov V.F.Chukhrjaev N.P.Kalinin V.V.

(73)

Holder

Karpinskij Mashinostroitel'Nyj Zavod

DRILL BIT FOR ROTARY DRILLING Russian patent published in 1997 - IPC

Abstract RU 2090734 C1

FIELD: rock-cutting tools, in particular, drill bits for rotary drilling. SUBSTANCE: drill bit has body with shank and wings on which main and peripheral inserts are installed. Inserts form nonrectilinear continuous cutting-gaging blade. Main inserts have negative rake whose value reduces for each, subsequent from drill bit axis insert and depends on relation between drill bit radius and distance from drill bit axis to the most distant cutting blade of main insert. EFFECT: higher efficiency. 5 dwg, 2 tbl

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RU 2 090 734 C1

Authors

Shamshin V.N.

Jakimov V.P.

Gavrilov V.A.

Brezhitskij V.P.

Dul'Tsev I.M.

Marchuk A.I.

Gashkov V.F.

Chukhrjaev N.P.

Kalinin V.V.

Dates

1997-09-20—Published

1992-03-19—Filed