Rock drill bit

Details Rock drill bit Rock drill bit

1984-12-19

1986-08-26

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Plural separable cutter elements

E21B 1016, E21B 1052

Patent

active

046077120

ABSTRACT:
Rock drill bit of the impact type comprising a cylindrical body and a front surface provided with fixed peripherally spaced inserts. The head section of each insert comprises a first and a second working surface. The first working surface is arched in the radial direction of the rock drill bit but planar in a direction perpendicular thereto. The second working surface is quarter-spherical and turned towards the center of the rock drill bit. A transition portion extends between the first working surface and the jacket surface of the insert. The transition portion determines the diameter of the bore.

REFERENCES:
patent: 1516601 (1924-11-01), Hawkesworth
patent: 2689109 (1954-09-01), Curtis
patent: 3145791 (1964-08-01), Schlossin
patent: 3269470 (1966-08-01), Kelly, Jr.
patent: 4296825 (1981-10-01), Larsson
patent: 4406337 (1983-09-01), Dill

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