Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1995-06-06
1997-06-24
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
761082, 175366, 175375, E21B 1020
Patent
active
056410298
ABSTRACT:
A drill bit (20) for a modular arm (70) is provided. The modular arm (70) includes an inside surface (76) having first (144) and second (146) angled surfaces whose lower portions form an inwardly projecting wedge (125). A curved throat relief area (87) connects to a lower edge (152) of the wedge (125). A pocket (54) in the drill bit (20) is sized to receive the support arm (70). The pocket (54) includes a wedge-shaped recess (121) sized to receive the wedge (125) of the support arm (70). A triangular weld groove (126) is provided in the convex surface of the bit body (40). A length of weld (128) is applied in the weld groove (126) for firmly securing the support arm (70) to the bit body (40).
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Beaton Michael S.
Bird Jay S.
Dang Hoang C.
Dresser Industries Inc.
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