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2 029 057

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C1

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IPC

(21) (22)

Application

4938581/03, 1991-05-24

(22)

Actual filing date

1991-05-24

(45)

Published

1995-02-20

(72)

Inventor

Nikolaev V.F.Ehdel'Man Ja.A.Messer A.G.Pavlov N.G.Makushin V.V.Surkov D.V.

(73)

Holder

Nauchno-Issledovatel'Skij Institut Burovoj Tekhniki

CORE CATCHER Russian patent published in 1995 - IPC

Abstract RU 2029057 C1

FIELD: drilling equipment. SUBSTANCE: core catcher has holder 2 with ports 1, toggle 3 with turning shafts. Toggle 3 has cutting edge 5 on one end and shank 6 on the other end, and ring 7 locking toggle in holder ports and contacts shank 6 of toggle 3. Toggle 3 is installed with its shank contacting ring over ring inner surface generating line. Part of contact surface of toggle 3 with ring 7 lies below plane running through axis of shaft square to longitudinal axis of core catcher. Height of contact of shank 6 of toggle 3 with ring 7 exceeds radius of shaft end face. EFFECT: prevented washing out of core and higher reliability of catcher operation due to its increased strength. 2 cl, 2 dwg

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RU 2 029 057 C1

Authors

Nikolaev V.F.

Ehdel'Man Ja.A.

Messer A.G.

Pavlov N.G.

Makushin V.V.

Surkov D.V.

Dates

1995-02-20—Published

1991-05-24—Filed

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