Covers for suction boxes

Claim 1

IN A PAPER-MAKING MACHINE INCLUDING A TRAVELLING SCREEN ADAPTED TO RECEIVE A PAPER PULP WEB THEREON, A SUCTION BOX ASSEMBLY FOR EXTRACTING MOISTURE FROM THE PAPER PULP ON SAID SCREEN, SAID SUCTION BOX INCLUDING A PLURALITY OF TRANSVERSELY EXTENDING ROLLERS ROTATABLY SUPPORTED IN SIDE-BY-SIDE SPACED RELATIONSHIP, A BELT TRAINED AROUND AND ENCLOSING ALL OF THE ROLLERS AT EACH SIDE OF THE SERIES OF ROLLERS, SAID SCREEN BEING OF A WIDTH TO OVERLAP AND REST UPON, AT ITS OPPOSITE SIDES, SAID BELTS, MEANS SEALING THE OPPOSITE END ROLLERS BELOW SAID SCREEN, MEANS SEALING THE SUCTION BOX BETWEEN STATIONARY PORTIONS OF THE BOX AND SAID BELTS WHEREBY THE SCREEN IS ENGAGED ONLY BY PORTIONS OF THE SUCTION BOX WHICH ARE TRAVELLING AT A SPEED SUBSTANTIALLY THE SAME AS THE SPEED OF SAID SCREEN, MEANS DRIVINGLY CONNECTING ALL OF THE ROLLERS, THE LAST MENTIONED MEANS COMPRISING A SERIES OF TEETH FORMED ON THE INNER SURFACE OF SAID BELTS AND THERE BEING SIMILARLY FORMED TEETH ON SAID ROLLERS WITH WHICH THE BELT TEETH ENGAGE.