Rotary drill bit

Details Rotary drill bit Rotary drill bit

1984-12-06

1985-11-26

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

384 94, E21B 1022

Patent

active

045549850

ABSTRACT:
A rotary drill bit comprising a head and a roller cutter rotatably carried thereon, wherein an annular sealing means is arranged in an annular chamber adjacent to a gap between the roller cutter and the head. At least one of the sealing surfaces of the chamber is generally seen V-shaped. According to the invention larger sealing pressure is obtained at two circumferentially spaced portions of the V-shaped sealing surface than at an intermediate portion thereof while simultaneously maintaining sealing pressure along the entire circumferential extent of the sealing means between said spaced portions.

REFERENCES:
patent: 2420104 (1947-05-01), Smith
patent: 3127942 (1964-04-01), Neilson
patent: 3698728 (1972-10-01), Walker
patent: 4372624 (1983-02-01), Neilson

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