Roller cutter drill bit

Details Roller cutter drill bit Roller cutter drill bit

1976-05-07

1977-07-26

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

E21B 910

Patent

active

040376737

ABSTRACT:
An earth boring drill employing roller cutters is provided with a seal in a peripheral groove to inhibit ingress of detritus into the cutter bearing area and egress of lubricant therefrom. The shape of the seal is such that its cross section is not overly compressed or displaced when in operating position, thus preventing undue compression set, wear and heating of the seal. A preferred seal has a greater radial dimension than axial dimension by a ratio of at least one-and-one-half to one to conserve bearing space and to provide the necessary flexibility to accommodate the various movements of the cutter relative to the shaft upon which it is rotatably mounted. The roller cutter has a counterbore fitting over a short cylindrical boss from which the shaft extends on which the cutter is mounted. This provides a tortuous passage restricting ingress of detritus and substantially improved life of the drill bit.

REFERENCES:
patent: 2174102 (1939-09-01), Catland
patent: 2906504 (1959-09-01), Parks
patent: 3251634 (1966-05-01), Dareing
patent: 3365247 (1968-01-01), Ferrand
patent: 3761145 (1973-09-01), Schumacher, Jr.
patent: 3765495 (1973-10-01), Murdoch et al.
patent: 3923348 (1975-12-01), Peck

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