Filter

Claim 2

A FILTER COMPRISING A ROTATABLE DRUM HAVING A PLURALITY OF PERFORATIONS A PLURALITY OF ROPES ENCIRCLING SAID DRUM FOR MAINTAINING A SUBSTANCE BEING TREATED IN POSITION A PLURALITY OF PRESSURE ROLLERS ARRANGED ON THE PAPHERY OF SAID ROTATABLE DRUM ON SUPPORTING SHAFTS TO PROVIDE FOR PUSHING ACTION TOWARD SAID DRUM A PESSURE BELT HAVING A PLURALITY OF PERFORATIONS SAIDD BELT BEING FORMED IN AN ENDLESS BELT AND INTERPOSEDD BETWEEN SAID DRUM AND SAID PRESSURE ROLLERS CHAINS MOUNTED ON BOTH SIDES OF SAID PRESSURE BELT FOR DRIVING SAID PRESSURE BELT SEALING MEANS PROVIDED AT BOTH EDGES OF SAID DRUM AND AT CORRESPONDING EDGES OF SAID PRESSURE BELT GUIDE MEANS MOUNTED ON THE SUPPORTING SHAFTS OF THE PLURALITY OF PRESSURE ROLLERS AND SO POSITOND THAT THE CLEARANCE BETWEEN SAID PRESSURE BELT AND SAID DRUM IS NARROWER AT THE SIDE WHERE THE SUBSTANCE BEING TREATED IS OUTPUT THAN AT A SUPPLY SIDE THEREOF, ROLLERS MOUNTED ON THE CHAINS AND ADAPTED TO BE GUIDED INTO SAID GUIDE MEANS AND A MEANS FOR SUPPLYING MUDDY SUBSTANCE TO BE TREATED POSITIONED ADJACENT TO THE PORTION WHERE THE CLEARANCE BETWEEN SAID DRUM AND SAID PRESSURE BELT IS WIDEST THE INTERIOR SURFACE OF THE WALL OF SAID DRUM TAPERING OUTWARDLY FROM ITS CENTRAL PORTION.

Claim 3

A filter comprising a rotatable drum having a plurality of perforations; a plurality of ropes encircling said drum for maintaining a substance being treated in position; a plurality of pressure rollers arranged on the periphery of said rotatable drum on supporting shafts to provide for pushing action toward said drum; a pressure belt having a plurality of perforations, said belt being formed in an endless belt and interposed between said drum and said pressure rollers; chains mounted on both sides of said pressure belt for driving said pressure belt, said pressure belt being comprised of a plurality of narrow, perforated pushing plates which are connected to each other on either side by means of the chain so as to form an endless loop; sealing means provided at both edges of said drum and at corresponding edges of said pressure belt; guide means mounted on the supporting shafts of the plurality of pressure rollers and so positioned that the clearance between said pressure belt and said drum is narrower at the side where the substance being treated is output than at a supply side thereof; rollers mounted on the chains and adapted to be guided into said guide means; and a means for supplying muddy substance to be treated positioned adjacent to the portion where the clearance between said drum and said pressure belt is widest.

Claim 4

A filter comprising a rotatable drum having a plurality of perforations; a plurality of ropes encircling said drum for maintaining a substance being treated in position; a plurality of pressure rollers arranged on the periphery of said rotatable drum on supporting shafts to provide for pushing action toward said drum; a pressure belt having a plurality of perforations, said belt being formed in an endless belt and interposed between said drum and said pressure rollers; chains mounted on both sides of said pressure belt for driving said pressure belt, said pressure belt being comprised of a plurality of narrow, perforated pushing plates which are connected to each other on either side by means of the chain so as to form an endless loop; sealing means provided at both edges of said drum and at corresponding edges of said pressure belt; guide means mounted on the supporting shafts of the plurality of pressure rollers and so positioned that the clearance between said pressure belt and said drum is narrower at the side where the substance being treated is output than at a supply side thereof; rollers mounted on the chains and adapted to be guided into said guide means; and a means for supplying muddy substance to be treated positioned adjacent to the portion where the clearance between said drum and said pressure belt is widest.

Claim 5

A filter according to claim 2 wherein each pushing plate is comprised of end members connected to the chains and an intermediate plate having a plurality of perforations and positioned between said members.

Claim 6

A filter comprising a rotatable drum having a plurality of perforations; a plurality of ropes encircling said drum for maintaining a substance being treated in position; a plurality of pressure rollers arranged on the periphery of said rotatable drum on supporting shafts to provide for pushing action toward said drum; a pressure belt having a plurality of perforations, said belt being formed in an endless belt and interposed between said drum and said pressure rollers; chains mounted on both sides of said pressure belt for driving said pressure belt; sealing means provided at both edges of said drum and at corresponding edges of said pressure belt; guide means mounted on the supporting shafts of the plurality of pressure rollers and so positioned that the clearance between said pressure belt and said drum is narrower at the side where the substance being treated is output than at a supply side thereof; rollers mounted on the chains and adapted to be guided into said guide means, said guide means defining channels for guiding the rollers mounted on the chains and mounted on the supporting shafts for bearing plates provided with the plurality of pressure rollers, said shafts being supported by springs; and a means for supplying muddy substance to be treated positioned adjacent tO the portion where the clearance between said drum and said pressure belt is widest.

Claim 7

A filter comprising a rotatable drum having a plurality of perforations; a plurality of ropes encircling said drum for maintaining a substance being treated in position; a plurality of pressure rollers arranged on the periphery of said rotatable drum on supporting shafts to provide for pushing action toward said drum; a pressure belt having a plurality of perforations, said belt being formed in an endless belt and interposed between said drum and said pressure rollers; chains mounted on both sides of said pressure belt for driving said pressure belt; sealing means provided at both edges of said drum and at corresponding edges of said pressure belt; guide means mounted on the supporting shafts of the plurality of pressure rollers and so positioned that the clearance between said pressure belt and said drum is narrower at the side where the substance being treated is output than at a supply side thereof; rollers mounted on the chains and adapted to be guided into said guide means, said guide means defining channels for guiding the rollers mounted on the chains and mounted on the supporting shafts for bearing plates provided with the plurality of pressure rollers, said shafts being supported by springs; and a means for supplying muddy substance to be treated positioned adjacent tO the portion where the clearance between said drum and said pressure belt is widest.