Screen and pneumatic separator

Claim 1

A DEVICE FOR SEPARATING SMALL PARTICLES FROM A STREAM CONTAINING THESE PARTICLES AND ALSO CONTAINING ELONGATED FOREIGN BODIES HAVING DIAMETER CLOSE TO THOSE OF THE PARTICLES, SAID APPARATUS HAVING A SUBSTANTIALLY HORIZONTAL SCREEN WITH A MESH SIZE SUITABLE FOR PASSING THE DESIRED PARTICLES, VIBRATING MEANS CONNECTED TO THE SCEEEN FOR VIBRATING IT, SUPPLY STRUCTURE CONNECTED TO DELIVER THE STREAM TO THE SCREEN SO THAT IT FLOWS OVER THE SCREEN AS THE SCREEN VIBRATES, SAID SUPPLY STRUCTURE INCLUDING FEED MEANS FOR DELIVRING THE STREAM IN A FLAT SHALLOW LAYER, SAID SCREEN HAVING AN ATTACHED APRON FOR RECEIVING THE PARTICLES AND FEEDING THEM ONTO THE SCEEEN, SAID APRON BEING ARRANGED IN A SUBSTANTIALLY HORIZONTAL POSITION CAUSING ELONGATED FOREIGN BODIES DEPOSITED THEREON TO APPROACH THE HORIZONTAL AND PASS OVER SAID SCREEN WITHOUT FALLING THROUGH IT, WHILE THE PARTICLES PASS THROUGH AS SCREENED PARTICLES, POURING MEANS BELOW SAID SCREEN CONNECTED TO POUR TWO PARALLEL ELONGATED NARROW CURTAIN TYPE STREAMS OF SAID SCREENED PARTICLES DOWN THROUGH AN OPEN SPACE, BLOWER STRUCTURE CONNECTED TO BLOW AIR HORIZONTALLY IN SAID OPEN SPACE AND ACROSS STREAM, SAID BLOWER STRUCTURE INCLUDING A PLURALITY OF BLOWERS FACING EACH OTHER THE BLOWER AIR MOVING FROM OUTSIDE BOTH STREAMS TO THE ZONE BETWEEN THESE STREAMS, SUCTION MEANS HAVING A SUCTION INLET IN SAID ZONE FOR EXHAUSTING THE BLOWN AIR, A PAIR OF SEPARATOR PARTITIONS BELOW SAID OPEN SPACE TO SPLIT THE FALLING STREAMS INTL LIGHTER PARTICLES THAT ARE DEFLECTED INTO SAID ZONE BY BLOWN AIR, HEAVIER PARTICLES THAT ARE NOT SO DEFLECTED, A COLLECTOR FOR COLLECTING THE DEFLECTED PARTICLES OF BOTH STREAMS, AND A COLLECTOR FOR SEPARATELY COLLECTING THE UNDEFLECTED PARTICLES OF BOTH STREAMS.

Claim 2

A DEVICE FOR SEPARATING SMALL PARTICLES FROM A STREAM CONTAINING THESE PARTICLES AND ALSO CONTAINING ELONGATED FOREIGN BODIES HAVING DIAMETER CLOSE TO THOSE OF THE PARTICLES, SAID APPARATUS HAVING A SUBSTANTIALLY HORIZONTAL SCREEN WITH A MESH SIZE SUITABLE FOR PASSING THE DESIRED PARTICLES, VIBRATING MEANS CONNECTED TO THE SCEEEN FOR VIBRATING IT, SUPPLY STRUCTURE CONNECTED TO DELIVER THE STREAM TO THE SCREEN SO THAT IT FLOWS OVER THE SCREEN AS THE SCREEN VIBRATES, SAID SUPPLY STRUCTURE INCLUDING FEED MEANS FOR DELIVRING THE STREAM IN A FLAT SHALLOW LAYER, SAID SCREEN HAVING AN ATTACHED APRON FOR RECEIVING THE PARTICLES AND FEEDING THEM ONTO THE SCEEEN, SAID APRON BEING ARRANGED IN A SUBSTANTIALLY HORIZONTAL POSITION CAUSING ELONGATED FOREIGN BODIES DEPOSITED THEREON TO APPROACH THE HORIZONTAL AND PASS OVER SAID SCREEN WITHOUT FALLING THROUGH IT, WHILE THE PARTICLES PASS THROUGH AS SCREENED PARTICLES, POURING MEANS BELOW SAID SCREEN CONNECTED TO POUR TWO PARALLEL ELONGATED NARROW CURTAIN TYPE STREAMS OF SAID SCREENED PARTICLES DOWN THROUGH AN OPEN SPACE, BLOWER STRUCTURE CONNECTED TO BLOW AIR HORIZONTALLY IN SAID OPEN SPACE AND ACROSS STREAM, SAID BLOWER STRUCTURE INCLUDING A PLURALITY OF BLOWERS FACING EACH OTHER THE BLOWER AIR MOVING FROM OUTSIDE BOTH STREAMS TO THE ZONE BETWEEN THESE STREAMS, SUCTION MEANS HAVING A SUCTION INLET IN SAID ZONE FOR EXHAUSTING THE BLOWN AIR, A PAIR OF SEPARATOR PARTITIONS BELOW SAID OPEN SPACE TO SPLIT THE FALLING STREAMS INTL LIGHTER PARTICLES THAT ARE DEFLECTED INTO SAID ZONE BY BLOWN AIR, HEAVIER PARTICLES THAT ARE NOT SO DEFLECTED, A COLLECTOR FOR COLLECTING THE DEFLECTED PARTICLES OF BOTH STREAMS, AND A COLLECTOR FOR SEPARATELY COLLECTING THE UNDEFLECTED PARTICLES OF BOTH STREAMS.