Insert with locking projection

Details Insert with locking projection Insert with locking projection

1981-03-31

1983-09-27

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

175374, E21B 1016, E21B 1052

Patent

active

044063377

ABSTRACT:
A cutting element insert for an earth boring bit has one or more small projections formed on its bottom. The projections are offset from the axis of the insert. When the insert is pressed into the hole in the supporting structure of the bit, the projections will embed into the bottom of the hole to help retain the insert against rotation.

REFERENCES:
patent: 1053709 (1913-02-01), Collins
patent: 2081302 (1937-05-01), Jarvis
patent: 3581835 (1969-05-01), Stebley
patent: 3599737 (1971-08-01), Flecher
patent: 3693736 (1972-09-01), Gardner
patent: 3749190 (1973-07-01), Shipman
patent: 3858671 (1975-01-01), Kita et al.
patent: 4073354 (1978-02-01), Bowley et al.
patent: 4176725 (1979-12-01), Shields
patent: 4199035 (1980-04-01), Thompson

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