Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Patent
1989-11-28
1991-12-10
Neuder, William P.
Boring or penetrating the earth
Bit or bit element
Plural separable cutter elements
166 557, 408224, E21C 1300
Patent
active
050709526
ABSTRACT:
A cutter for a downhole milling or cutting tool and a tool incorporating the blade has a longitudinal axis about which the tool is rotatable. The tool may have a plurality of circumferentially disposed blades which are either fixed or radially movable to perform a cutting operation. Each of the cutters has a blade having a cutting surface which is formed by a plurality of cutting elements. Each of the cutting elements has a cutting edge and a plurality of protruding ridges each of which are longitudinally spaced from one another and interspaced from one another by a recess portion so that in use swarf moves upwardly from a first cutting edge along the recess portion and is broken off when approaching the next, uppermost, ridge. By providing such relatively closely spaced ridges generally C-shaped swarf cuttings are produced and "birdnesting" is substantially reduced or eliminated. The cutting elements each have a cutting surface which presents a negative radial rake angle.
REFERENCES:
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patent: 2846193 (1958-08-01), Chadderdon
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patent: 3106973 (1963-10-01), Christensen
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patent: 4115024 (1978-09-01), Sussmuth
patent: 4655648 (1987-04-01), Hellbergh
patent: 4710074 (1987-12-01), Springer
patent: 4872520 (1989-10-01), Nelson
Neuder William P.
Smith International Inc.
Upton Robert G.
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