Rock drill

Details Rock drill Rock drill

1973-10-01

1976-06-15

Leppink, James A.

Tool driving or impacting

Impacting devices

With means for rotating tool

173134, B25D 900

Patent

active

RE0288594

ABSTRACT:
A rock drill wherein a piston is the only moving hammer part and such piston is movable without independent valve means or the like.

REFERENCES:
patent: 3082741 (1963-03-01), Huffman
patent: 3154153 (1964-10-01), Wilder et al.
patent: 3410354 (1968-11-01), Sudnishnikov et al.
patent: 3456744 (1969-07-01), Altschuler

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