Earth boring bit with bearing sleeve

Details Earth boring bit with bearing sleeve Earth boring bit with bearing sleeve

1985-02-25

1986-07-15

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175369, 384 96, E21B 1020

Patent

active

046000640

ABSTRACT:
An earth boring bit having an improved two piece bearing construction using an internally tapered and threaded, cantilevered bearing lug extending obliquely inwardly and downwardly from a leg carried by the body of the bit. An internally tapered and threaded bearing sleeve is made up on the lug, and includes a mouth that engages a shoulder on a base region of the bearing lug. The mouth of the sleeve has a minimum radial thickness such that the sleeve may be made up to a selected minimum torque. The bearing sleeve has a length greater than that of the treaded portion to define a thick walled inner end region to receive a resilient retainer ring in a groove that provides a minimum section over the threads on the interior of the sleeve. The sleeve is boronized to achieve wear resistance in a manner that does not substantially reduce strength.

REFERENCES:
patent: 1320384 (1919-11-01), Godbold et al.
patent: 1647753 (1931-05-01), Scott et al.
patent: 1729062 (1929-09-01), Bull
patent: 1803679 (1931-05-01), Scott
patent: 1854624 (1932-04-01), Powell
patent: 1858980 (1932-05-01), Behnke
patent: 1873245 (1932-08-01), Abegg
patent: 2145573 (1939-01-01), Phipps
patent: 2249578 (1941-07-01), Phipps
patent: 2654577 (1953-10-01), Green
patent: 3016099 (1962-01-01), Woodruff
patent: 3922038 (1975-11-01), Scales
patent: 4344658 (1982-08-01), Ledgerwood

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