Rock drill

Details Rock drill Rock drill

1976-03-25

1978-02-21

Hafer, Robert A.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

173 11, B23Q 500

Patent

active

040747719

ABSTRACT:
A rock drill assembly and more particularly a rock drill assembly having improved fluid power means therefor.

REFERENCES:
patent: 3561542 (1971-02-01), Hanson
patent: 3581830 (1971-06-01), Stoner
patent: 3823784 (1974-07-01), Feucht
patent: 3971449 (1976-07-01), Nylund et al.

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