Pulp screen or filter

Claim 1

IN A MACHINE FOR TREATING A SUSPENSION OF SOLIDS IN A LIQUID, IN COMBINATION, A CASING, A SCREENING STRUCTURE SUPPORTED FOR ROTATION WITHIN SAID CASING, SAID SCREENING STRUCTURE COMPRISING A CYLINDRICAL SCREEN WALL AND A CYLINDRICAL SUPPORT GRID CONCENTRIC WITH AND SPACED OUTWARDLY FROM SAID SCREEN WALL PROVIDING AN ANNULARLY CONTINUOUS CIRCUMFERENTIAL SPACE THEREBETWEEN, A SHAFT MOUNTED FOR ROTATION WITHIN SAID CASING, AXIALLY SPACED SUPPORTING FLANGES MOUNTED ON AND FOR ROTATION WITH SAID SHAFT AND CONNECTED TO ONE END OF SAID SCREEN WALL AND SAID SUPPORT GRID RESPECTIVELY AND DEFINING A RADIAL CIRCUMFERENTIALLY CONTINUOUS SPACE THEREBETWEEN IN COMMUNICATION WITH SAID ANNULAR SPACE, AN ANNULAR SUPPORTING RING CONNECTING THE OTHER ENDS OF SAID SCREEN WALL AND SAID SUPPORT GRID AND CLOSING THAT END OF THE ANNULAR SPACE, A WASHING FLUID EMITTING TUBE DISPOSED WITHIN SAID ANNULAR SPACE, WASHING FLUID SUPPLY CONNECTIONS COUPLED TO ONE END OF SAID TUBE EXTENDING THROUGH SAID RADIAL SPACE, AND MEANS FOR STATIONARILY SUPPORTING SAID TUBE AND THE SUPPLY CONNECTIONS WITHIN SAID ANNULAR AND RADIAL SPACES.