Patent ID: 8296891

Claim:
A cleaning device for underwater vacuuming of debris from structural surfaces such as the bottom of swimming pools or other water containing structure and comprising a substantially closed housing formed by wall and providing a suction cavity, a debris-water suction inlet extending thru said wall and opening into said suction cavity and adapted to be moved with said device along said surfaces in proximity thereto and any debris field thereon, a debris-water discharge stream conduit formed by said wall and having an exit end surrounded by a filter container which is affixed to and extends outwardly of said housing for entrapping said debris, said discharge conduit having a flow axis and opening into said suction cavity, a water ejector tube having a flow axis and being mounted thru a portion of said wall which lies downstream of said suction inlet and above said suction inlet, said tube having a water ejector end extending into said suction cavity and having a water inlet end extending outwardly thru said portion of said wall, a water inlet port on said inlet end of said ejector tube and being connected to a high pressure water pump the inlet of which is located exteriorly of said housing at a location above and isolated from said suction inlet and said any debris field, and when the device is in use said pump inlet is in immediate communication with a section of the body of water in said water containing structure and above said suction inlet, said pump inlet being isolated from said suction cavity and said discharge stream conduit and from any water or debris therein, said ejector end being spaced from said wall and communicating with said discharge conduit, the ejector tube flow axis and the discharge conduit flow axis being in general alignment, wherein the ratio of the flow area of said discharge conduit to the flow area of said ejector tube is always within the limits of from about 1.5 to about 30.0, whereby when a water stream is ejected from said ejector end and thru said discharge conduit and into said filter container, the pressure within said suction cavity will be reduced sufficiently to suck water-debris from said surfaces up thru said suction inlet and into said debris-water stream for transport into said container without said inlet port of said ejector tube and said inlet of said high pressure water pump being exposed to said debris-water discharge stream.