Down-the-hole drilling machine

Tool driving or impacting – Impacting devices – Impact transmitting anvil

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Details

173128, 92177, E21B 106

Patent

active

052793710

ABSTRACT:
Down-the-hole drilling machine comprising a housing in form of a tube (1), a hammer piston (6) being movable to-and-fro in the tube and intended for impacting a drill bit (5). The hammer piston is at its ends provided with end sections in form of polygons with rounded corners (51, 52). These end sections are turned relative to each other an angle which is half as large as the angle between two adjacent corners.

REFERENCES:
patent: 1069853 (1913-08-01), Carter
patent: 2013744 (1935-09-01), Curtis
patent: 3180236 (1965-04-01), Beckett
patent: 3270821 (1966-09-01), Bassett et al.
patent: 4821812 (1989-04-01), Ditzig
patent: 4831919 (1989-05-01), Bruni

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