Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1989-07-07
1990-06-26
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175343, 175353, 175365, 175376, E21B 1008
Patent
active
049363980
ABSTRACT:
A drill bit for earth boring purposes includes a drill bit body which is rotatable about a drilling axis, a single cutting member mounted rotatably on the body and a counter-reaction member also mounted on the body. The counter-reaction member extends partially downwardly from the body and includes first and second outwardly exposed surfaces. The first surface has a greater surface area than the second surface and is at least partially formed with a circumferentially disposed curvature and a longitudinally disposed curvature with respect to the drilling axis so that it can closely conform to and contact the curvature of the bottom of the hole formed by the drill bit. The first surface of the counter-reaction member acts as a friction pad to counteract the torque effects of rotating the drill bit about the drilling axis and the cutting member engaging in the ground. The second surface is situated substantially circumferentially adjacent to the first surface and is inwardly angularly disposed with respect to the first surface and forms an obtuse angle with the first surface. The second surface has a plurality of teeth mounted on it for smoothing the bottom of the hole formed by the drill bit by removing ridges formed in the bottom of the hole by the teeth of the cutting member as the drill bit rotates.
REFERENCES:
patent: 1852843 (1932-04-01), Greve
patent: 1879127 (1932-09-01), Schlumpf
patent: 3424258 (1969-01-01), Nakayama
patent: 4285409 (1981-08-01), Allen
patent: 4444281 (1984-04-01), Schumacher, Jr. et al.
patent: 4549614 (1985-10-01), Kaalstad et al.
patent: 4790397 (1988-12-01), Kaalstad et al.
patent: 4832143 (1989-05-01), Kaalstad et al.
Auty David H.
Wheeldon Peter G.
Cledisc International B.V.
Dang Hoang C.
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