US Patent 7290307 Implement for removing pavement cleaner

A pavement cleaning vehicle includes a tow vehicle and a trailer towed behind the tow vehicle that includes a vacuum head mounted to the trailer that consumes fresh water from a fresh water holding tank on the tow vehicle in rinsing underlying pavement. Pressurized fresh water is sprayed within a spray containing spray chamber of a vacuum head through nozzles aligned transversely across the vehicle travel path. The vacuum chamber is partitioned in the vacuum head from the spray chamber by a divider extending downward but terminating short of the underlying pavement therein establishing a chamber gap through which rinse water within the spray chamber dispersed from the pavement is drawn into the vacuum chamber which is maintained at reduced air pressure by an air-water separator tank that draws air and water mix from the vacuum head into it for air-water separation. Water is then conducted to a rinse water holding tank and air is exhausted to atmosphere. During operation the vacuum head is supported rearward of the trailer on support wheels maintaining the vacuum head in close proximity to the pavement. The vacuum head is lifted off the pavement surface for general travel with the trailer during non-operational periods by a lift line routed through a boom extending rearward over the vacuum head from the trailer.