Liquid filtering apparatus

Claim 1

A liquid filter for use at least partially submerged in a tank containing liquid with contaminants therein including: A. a drum defining a space therein for receiving filtered liquid; B. means for supporting said drum for rotation in the tank at least partially submerged within the liquid therein; C. power operated means for supplying an elongated sheet of filter medium about the drum to exclude liquid from the space within the drum except through said filter medium; D. filter medium support means extending about and carried by said drum permitting liquid after passing through the filter medium to collect at a bottom portion within the drum; E. an outlet communicating with the filtered liquid within the drum adjacent the bottom portion of the drum for removing filtered liquid therefrom maintaining a liquid level outside the drum higher than a liquid level within the drum; F. a driving means having driving connection adjacent the periphery of said drum exteriorally of said tank for rotating the drum independently of the filter medium moving fresh filter medium about the drum while removing spent filter medium; G. sealing means including a flange carried by the tank defining an opening therein, and rotary sealing means carried by said flange within which said drum rotates, separating said driving means from said filtered liquid, H. means below said flange receiving filtered liquid from said drum through said opening; and I. squeeze rolls driven by said power operated means between which said spent filter medium is passed after liquid contact for compacting the filtered-out material and removing excess liquid from said filter media.