ROTARY TRENCHES HAVING ADJUSTABLE DEPTH CONTROL MEANS

摘要

A trench-forming device includes an elongate boom which is swingably mounted on a transverse drive shaft of a vehicle. A revolvable blade is carried by the outer end of the boom and is driven by an endless chain and sprocket which is connected to the drive shaft of the vehicle. An adjustable depth-control member is mounted on the boom to permit adjustable control of the depth of the trench being formed.