Screed for road finishing machine
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United States of America Patent
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-
Jan 15, 2013
Grant Date -
Apr 21, 2011
app pub date -
Oct 19, 2010
filing date -
Oct 20, 2009
priority date (Note) -
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Abstract
In a screed with a basic screed and at least one extendable screed movable relative to the basic screed with a hydraulic cylinder and an electro-hydraulic control comprising a magnet-actuated directional control valve for at least controlling the direction of the hydraulic cylinder, the directional control valve for changing the rate of motion of the hydraulic cylinder is guided by an operator or automatically and is a proportional directional control valve (W) with proportional-electric direct actuation or proportional-electric-hydraulic pilot control. The proportional directional control valve for the hydraulic cylinder is connected on the actuation side with an electro-hydraulic control of a hydraulic system of the road finishing machine.
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