Rock bit having an improved cone retention system

Details Rock bit having an improved cone retention system Rock bit having an improved cone retention system

1978-06-26

1980-01-01

Butler, Douglas C.

Cutlery

308DIG11, F16C 3366

Patent

active

041813774

ABSTRACT:
A rotary drill bit having a cone retention system that eliminates the utilization of ball bearings. The drill bit comprises a main bit body having a plurality of legs extending downwardly therefrom. Each leg includes a journal for rotatively supporting a cone cutter. Each cone is retained on a respective journal by a plurality of segmented annular thrust members which extend into an internal annular groove formed within the cone cavity. The segmented thrust member also bears against a shoulder formed on the journal and is retained against the shoulder by a flanged member which, in turn, is threadedly secured to the journal. The threaded portion of the flanged member is relatively large to absorb the loads passing therethrough. A small aperture is also provided in the journal to receive a screw driver element which, in turn, is utilized to thread the flanged member onto the journal. After the threading operation is complete, the aperture is plugged with a weld to prevent the screw driver element from rotating.

REFERENCES:
patent: 2654577 (1953-10-01), Green
patent: 3971600 (1976-07-01), Murdoch et al.

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