Apparatus for removing sediment from swimming pools

Claim 1

IN A SWIMMING POOL FILTRATION CIRCULATING SYSTEM IN WHICH WATER IS CONTINUOUSLY SUCKED FROM THE POOL, DIRECTED THROUGH A MAIN FILTER, AND RETURNED TO THE POOL: AN APPARATUS FOR REMOVING SEDIMENT FROM THE FLOOR OF THE POOL, COMPRISING A READILY MANIPULABLE CONDUIT CONNECTABLE TO THE SUCTION SIDE OF THE CIRCULATING SYSTEM, A VACUUM HEAD AT THE FREE END OF SAID CONDUIT, A FILTERING UNIT FORMING PART OF SAID CONDUIT AND ADAPTED TO INTERCEPT SAID SEDIMENT, WHEREBY SAID SEDIMENT REMOVAL CAN BE CARRIED OUT PERIODICALLY WITHOUT DEPENDENCE UPON SAID MAIN FILTER FOR INTERCEPTION OF SAID SEDIMENT, SAID FILTERING UNIT COMPRISING A HOUSING INCLUDING INTERENGAGING BUT READILY SEPARABLE ELEMENTS DEFINING AN OUTER CASING WHEN JOINED TOGETHER, A PERFORATED INNER CAGE WITHIN SAID CASING AND SPACED FROM THE CASING WALL, AND A REPLACEABLE FILTERING CARTRIDGE MOUNTED WITHIN SAID HOUSING, SAID CAGE COMPRISING A CYLINDRICAL BODY HAVING A RELATIVELY LARGE PERFORATED SECTION AT ONE END, A RELATIVELY SMALL UNPERFORATED SECTION AT THE OTHER END, AN INNER SHOULDER BETWEEN SAID SECTION, A PERFORATED CAP REMOVABLY APPLICABLE TO THE END OF SAID PERFORATED SECTION, AND MEANS FOR FRICTIONALLY SECURING THE SMALL SECTION TO THE OUTER CASING, SAID CARTRIDGE BEING INSERTABLE INTO SAID CAGE THROUGH SAID LARGER SECTION WHEN THE CAP IS REMOVED THEREFROM.