Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Patent
1986-10-28
1988-01-05
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Plural separable cutter elements
175415, 175418, 175419, E21B 1036, E21B 1038
Patent
active
047169761
ABSTRACT:
A rotary percussion rock drill bit has a body and a symmetrical cross-like arrangement of crushing and cutting inserts secured on the body. The bit body has a rearward shank portion and a forward boring head portion with a front face. The cylindrical crushing inserts are secured in the forward head portion and have noncutting hemispherical rock crushing ends exposed at the front face of the head portion. The cutting inserts, which can be rectangular or cylindrical in shape, are secured in the forward head portion and have roof-shaped ends exposed at the front face of the head portion. A peak of each roof-shaped end defines a rock cutting edge. The crushing and cutting inserts are arranged on the head portion with their respective hemispherical and roof-shaped ends in a symmetrical cross-like pattern. The bit body also has a longitudinal central axis, and the crushing and cutting inserts are aligned along planes disposed in orthogonal relation to one another and intersecting at the central axis. At least one crushing insert is disposed on each opposite side of the central axis along one of the planes, whereas at least one cutting insert is disposed on each opposite side of the central axis along the other of the planes. The cutting edge of each of the cutting inserts extends generally parallel to and offset from the plane along which the cutting inserts are aligned.
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pp. 134 & 156 of a book in Russian by G. V. Artsimovich, E. P. Poladllo, and I. A. Sveshnikov, entitled "Research and Development of Rock-Destructive Tools for Drilling" (Izdatel'stvo Navka, Novosibirsh, 1980).
Kennametal Inc.
Novosad Stephen J.
Prizzi John J.
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