Expandable rock bit

Details Expandable rock bit Expandable rock bit

1981-05-18

1984-06-26

Purser, Ernest R.

Boring or penetrating the earth

Bit or bit element

Adjustable cutter element

407 41, 407 49, 175 53, 175413, 175406, E21B 1020

Patent

active

044560826

ABSTRACT:
This invention relates to large diameter raise bore rock bits. The invention comprises a means in which extensions may be attached to the outer diameter of the body of the rock bit, thus providing a variable diameter raise bore rock bit. The extensions are mounted to the primary body of the bit such that compressive loads are imposed on the attachment means. These compressive loads are transmitted from the extensions of the body by designing the extension portions of the bit such that they interlock to the basic bit body. The mating surfaces of the attachment means transmit predominantly compressive loads acting substantially normal to the load bearing surfaces. The attachment means are further designed to increase the grip of the extended bit portions as increased loads are applied to the body of the rock bit.

REFERENCES:
patent: 3318392 (1967-05-01), Hoen
patent: 4108259 (1978-08-01), Dixon et al.
patent: 4194578 (1980-03-01), Mitchell
patent: 4386670 (1983-06-01), Westermark

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