Tool driving or impacting – Automatic control of power operated means
Patent
1981-05-04
1983-10-18
Smith, James G.
Tool driving or impacting
Automatic control of power operated means
173 43, 414 5, 2481883, 248660, E21C 500
Patent
active
044100493
ABSTRACT:
A servo system is presented for controlling the angular attitude of machine units pivotally mounted on an outlying boom frame. Said system is applicable to rock drilling machines, breakers, loading scoops and forks, working platforms, manipulator booms, and the like. The system includes a directional control valve for governing the positioning motor of the machine unit. Under full working pressure the directional valve in itself provides automatic attitude control of the machine unit. To this end the directional valve is provided with a feedback position, in which the pressure fluid communications to the positioning motor are cut off and furthermore has a syngonous (uniangular) relationship on the one hand to the actual angle value of the machine unit with one of its valve elements and on the other to a selective set angle value with its other valve element.
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Atlas Copco Aktiebolag
Olszewski Robert P.
Smith James G.
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