Hopper outlet construction

Claim 1

IN COMBINATION, CLOSURE MEANS FOR THE OPENING OF A HOPPER HAVING A VACUUM CHAMBER FOR HANDLING FINELY DIVIDED LADING COMPRISING: (A) A CYLINDRICAL ELONGATED NOZZLE SECTION AT ONE END OF THE VACUUM CHAMBER FOR RECEIVING ENDWISE THEREOF A SUCTION HOSE, (B) A CYLINDRICAL CLOSURE CAP TELESCOPED OVER SAID HOSE RECEIVING NOZZLE SECTION TO CLOSE OFF THE SAME AND PROTECT THE SURFACE THEREOF TO BE OVERLAID BY THE SUCTION HOSE FROM CONTAMINATION, (C) A RADIAL FLANGE ON SAID NOZZLE SECTION ADJACENT THE OPEN END OF SAID CLOSURE CAP, (D) A RESILIENT GASKET BETWEEN SAID RADIAL FLANGE AND THE JUXTAPOSED END OF SAID CLOSURE CAP, (E) PIVOT PINS SECURED TO AND EXTENDING OUTWARDLY FROM DIAMETRICALLY OUTER SIDES OF SAID NOZZLE SECTION ON THE SIDE OF SAID RADIAL FLANGE AWAY FROM SAID CLOSURE CAP, (F) A BAIL IN THE FORM OF A ONE PIECE YOKE INCLUDING PARALLEL ARMS ROTATABLY MOUNTED AT ONE END ON SAID PIVOT PINS AND EXTENDING ALONG SAID NOZZLE SECTION AND JOINED AT THE OTHER END BY A RIGID UNINTERRUPTED CONNECTING PORTION SPACED FROM THE CLOSED END OF SAID CLOSURE CAP IN ITS CLOSED POSITION, AND (G) A PAIR OF CAMS ROTATABLY MOUNTED ON OPPOSITE SIDES OF SAID CONNECTING PORTION OF SAID BAIL ON THE SIDE THEREOF AWAY FROM SAID CLOSURE CAP TO SWING ON AN AXLE NORMAL TO A PLANE CONTAINING THE AXIS OF SWINGING MOVEMENT OF SAID BAIL FOR ENGAGING SAID CLOSED END OF SAID CLOSURE CAP AND RETAINING IT IN CLOSED POSITION AND IN TIGHTLY FITTING RELATION TO SAID RESILIENT GASKET.