Tool driving or impacting – Automatic control of power operated means
Patent
1976-01-15
1977-07-26
Schwadron, Martin P.
Tool driving or impacting
Automatic control of power operated means
91170R, 91414, 91420, 91447, 173 43, 214763, E21B 1500, F15B 1122, F15B 1301
Patent
active
040376710
ABSTRACT:
In a drill boom pivotally supporting a rock drilling apparatus, hydraulic parallel motion means is provided which includes a hydraulic pilot cylinder for sensing the setting of the elevation angle of the drill boom. During elevating of the drill boom the hydraulic pilot cylinder is furthermore used as an additional elevating cylinder.
REFERENCES:
patent: 3462103 (1969-08-01), Strom
patent: 3476193 (1969-11-01), Stromnes
patent: 3721304 (1973-03-01), Hanson
patent: 3922855 (1975-12-01), Bridwell
Kimber Erich Voldemar
Ronne Per-Axel Carsten
Atlas Copco Aktiebolag
Hershkovitz Abraham
Schwadron Martin P.
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