Mobile vacuum machine

Claim 1

A truck-mounted waste collection system adapted for vacuum pickup of materials lying on the ground surface, comprising (a) a collection tank mounted on said truck, said tank having a top inlet opening and a hinged rear cover for dumping materials accumulated therein; (b) a vacuum pickup conduit connected to said tank inlet at one of its ends, and having a second end opening proximate the ground surface; (c) a first outlet opening on said tank, adapted for the passage of air therethrough; (d) filter means connected to said first outlet opening, for removing particulate matter from air passing through said first outlet opening, said filter means having a filtered air outlet; (e) an air blower having a suction inlet and a pressure outlet, said suction inlet being connected to said filtered air outlet; (f) a first pressure conduit coupled to said pressure outlet, said first pressure conduit having closure means therein, and having an exhaust end opening to the atmosphere; (g) a second pressure conduit coupled to said pressure outlet, said second pressure conduit having a closure means therein and having a downstream end opening; (h) a third pressure conduit coupled to said pressure outlet, said third pressure conduit having closure means therein and having a downstream end opening; (i) a first pressure pipe having an end opening inside an upper region of said collection tank and having another end opening coupled to said downstream end opening of said second pressure conduit; (j) a second pressure pipe having an end opening inside a lower region of said collection tank and having another end opening coupled to said downstream end opening of said third pressure conduit; and (k) an unloading pipe in a lower region of said collection tank, said unloading pipe having a first end opening outside said tank and a second end opening inside said tank proximate to but spaced from said second pressure pipe end opening inside said tank.