Rock-breaking implement for percussive machines

Details Rock-breaking implement for percussive machines Rock-breaking implement for percussive machines

1979-05-30

1981-09-29

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

E21C 1308

Patent

active

042917743

ABSTRACT:
A rock-breaking implement, preferably for a self-propelled percussive machine for driving boreholes, having a body, at least a part of the body facing the borehole faces being cylindrical in shape. The body is provided with rock-breaking wedges which are arranged in such a manner that their blades extend radially at the end face of the body. The body has grooves opening outside to the periphery of the body and designed to remove broken rock, the grooves extending along helical lines and intersecting one another so that portions of the body located between the intersecting grooves define the rock-breaking wedges. Edges of said wedges which extend on the periphery of the body within the cylindrical part thereof define a continuous circle when projected to the plane of transverse section of the body and are designed for forming the walls of the borehole.

REFERENCES:
patent: 1387733 (1921-08-01), Midgett
patent: 1580254 (1926-04-01), Karns
patent: 1965491 (1934-07-01), Curtis
patent: 2179689 (1939-11-01), Earnheart
patent: 2519861 (1950-08-01), Turner
patent: 2971594 (1961-02-01), Spencer
patent: 4091884 (1978-05-01), Thomas
patent: 4144941 (1979-03-01), Ritter

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