Rock-breaking tool for percussive-action machines

Details Rock-breaking tool for percussive-action machines Rock-breaking tool for percussive-action machines

1979-06-13

1981-07-28

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175404, 175405, E21B 1048

Patent

active

042805732

ABSTRACT:
A rock-breaking tool for preferable use in self-propelled percussive machines for boring wells, comprising a casing with a pointed portion and an end face. The casing has an annular cutting edge formed by the pointed portion and inner tapered surface thereof. The casing is formed with a cone-shaped chamber open at the end face thereof, oriented toward the bottom of a well being drilled, the internal surface of the chamber intersecting with the conical surface of the annular cutting edge. The casing is also provided with ducts communicating the chamber with the surrounding space.

REFERENCES:
patent: 175672 (1876-04-01), Crump
patent: 583317 (1897-05-01), Wilson
patent: 1213652 (1917-01-01), Johnson
patent: 1505779 (1924-08-01), Hansen
patent: 1928451 (1933-09-01), Hammerberg
patent: 1932239 (1933-10-01), Berry
patent: 2499282 (1950-02-01), Roberts
patent: 2794623 (1957-06-01), Stokes
patent: 2807443 (1957-09-01), Wyman
patent: 3094180 (1963-06-01), Haith
patent: 3955631 (1976-05-01), Kostylev et al.

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