Screening apparatus

Claim 1

A DEVICE FOR SCREENING LIQUID SUSPENSION HAVING A SCREENING CHAMBER OPEN AT ITS UPPER END AND ENCLOSED BY A GENERALLY VERTICAL CYLINDRICAL SCREEN WALL, MEANS FOR CLEARING THE SCREEN MOUNTED WITHIN SAID SCREENING CHAMBER AND ADJACENT THE INLET FACE OF THE SCREEN FOR MOVEMENT THEREACROSS, SAID DEVICE HAVING AN INLET PORTION IN THE FORM OF A GENERALLY ARCUATE PASSAGE HAVING TWO GENERALLY CYLINDRICAL RADIALLY SPACED IMPERFORATE WALLS SURROUNDING AT LEAST A PORTION OF SAID CYLINDRICAL SCREEN WALL ADJACENT TO AND BELOW ITS OPEN END, SAID PASSAGE COMMUNICATING WITH SAID CHAMBER SOLELY OVER THE INLET OPENING DISPOSED BELOW WALL, SAID PASSAGE HAVING AN INLET OPENING DISPOSED BELOW THE UPPER MARGIN OF THE SCREEN WALL SERVING TO INTRODUCE A STREAM OF SAID SUSPENSION TANGENTIALLY INTO SAID ARCUATE PASSAGE, AND A TRAP OUTLET SPACED FROM SAID INLET OPENING ALONG THE PERIPHERY OF SAID PASSAGE AND EXTENDING TANGENTIALLY OUTWARDLY FROM SAID PASSAGE THROUGH THE OUTER WALL THEREOF AND COMMUNICATING WITH THE SPACE BETWEEN SAID TWO IMPERFORATE WALLS AND SPACED BELOW THE UPPER MARGIN OF SAID SCREEN WALL, SAID TRAP OUTLET BEING ARRANGED WITH RESPECT TO THE TANGENTIAL FLOW FROM THE INTLET TO RECEIVE SOLID OBJECTS THROWN OUTWARDLY BY CENTRIFUGAL FORCE DURING FLOW OF SAID SUSPENSION THROUGH SAID PASSAGE AND TO PREVENT SAID OBJECTS FROM ENTERING SAID SCREENING CHAMBER.

Claim 2

A DEVICE FOR SCREENING LIQUID SUSPENSION HAVING A SCREENING CHAMBER OPEN AT ITS UPPER END AND ENCLOSED BY A GENERALLY VERTICAL CYLINDRICAL SCREEN WALL, MEANS FOR CLEARING THE SCREEN MOUNTED WITHIN SAID SCREENING CHAMBER AND ADJACENT THE INLET FACE OF THE SCREEN FOR MOVEMENT THEREACROSS, SAID DEVICE HAVING AN INLET PORTION IN THE FORM OF A GENERALLY ARCUATE PASSAGE HAVING TWO GENERALLY CYLINDRICAL RADIALLY SPACED IMPERFORATE WALLS SURROUNDING AT LEAST A PORTION OF SAID CYLINDRICAL SCREEN WALL ADJACENT TO AND BELOW ITS OPEN END, SAID PASSAGE COMMUNICATING WITH SAID CHAMBER SOLELY OVER THE INLET OPENING DISPOSED BELOW WALL, SAID PASSAGE HAVING AN INLET OPENING DISPOSED BELOW THE UPPER MARGIN OF THE SCREEN WALL SERVING TO INTRODUCE A STREAM OF SAID SUSPENSION TANGENTIALLY INTO SAID ARCUATE PASSAGE, AND A TRAP OUTLET SPACED FROM SAID INLET OPENING ALONG THE PERIPHERY OF SAID PASSAGE AND EXTENDING TANGENTIALLY OUTWARDLY FROM SAID PASSAGE THROUGH THE OUTER WALL THEREOF AND COMMUNICATING WITH THE SPACE BETWEEN SAID TWO IMPERFORATE WALLS AND SPACED BELOW THE UPPER MARGIN OF SAID SCREEN WALL, SAID TRAP OUTLET BEING ARRANGED WITH RESPECT TO THE TANGENTIAL FLOW FROM THE INTLET TO RECEIVE SOLID OBJECTS THROWN OUTWARDLY BY CENTRIFUGAL FORCE DURING FLOW OF SAID SUSPENSION THROUGH SAID PASSAGE AND TO PREVENT SAID OBJECTS FROM ENTERING SAID SCREENING CHAMBER.