Roadside spray apparatus

Claim 1

A spray apparatus for roadside spraying from a moving vehicle; comprising: a boom arm for pivotally mounting on the front of the vehicle to transversely position one end of the boom arm at either side of the vehicle; an outer spraying means pivotally mounted at the outer end of the boom arm about a generally vertical pivot pin for pivoting of the outer spraying means in either direction upon engaging an obstacle; means to normally maintain the outer spraying means in a central position and to return said outer spraying means to the central position after it is disengaged by an obstacle; the means to maintain and return including a pivot arm pivotally mounted for pivoting in either direction about the pivot pin and extending past the pivot point away from the outer spraying means to act as a lever arm for the means to maintain and return the outer spraying means; the means to maintain and return including a plurality of extension springs connected with the lever arm to bias the lever arm to a central position to normally maintain the boom in its central position; the means to maintain and return an adjustable support connected with the plurality of extension springs and having a slidable mounting means to adjust the tension in the springs to vary the amount of force required to pivot the outer spraying means from its normal central position; the boom arm is pivotally mounted at its inner end for alternately positioning the outer end of the boom arm on either side of the vehicle; the outer spraying means includes a generally vertical telescoping support member supporting a plurality of spraying means; and the plurality of spraying means includes plural separate sets of spraying nozzles for selectively spraying separate areas extending outwardly from the support member.