Apparatus for extruding tubes of fibrous material

Claim 1

EXTRUSION APPARATUS FOR PRODUCING TUBULAR SAUSAGE CASINGS OF A FIBROUS MATERIAL OF ANIMAL ORIGIN, COMPRISING, IN COMBINATION, A TUBULAR INNER MEMBER HAVING AN OUTER CONICAL SURFACE AND AN OUTER CYLINDRICAL SURFACE MERGING INTO SAID CONICAL SURFACE AT THE SMALLER END OF THE SAME; A SUPPORTING CORE MEMBER PASSING THROUGH SAID TUBULAR INNER MEMBER AND TURNABLY SUPPORTING THE SAME, SAID SUPPORTING CORE MEMBER HAVING AN END PORTION PROJECTING OUT OF SAID INNER TUBULAR MEMBER ADJACENT SAID CYLINDRICAL SURFACE; A RING SECURED TO SAID PROJECTING END PORTION OF SAID CORE MEMBER AND HAVING AN OUTER CYLINDRICAL FACE COAXIAL WITH AND HAVING THE SAME DIAMETER AS SAID OUTER CYLINDRICAL SURFACE OF SAID INNER TUBULAR MEMBER AND FORMING A CONTINUATION OF THE SAME; AN OUTER TUBULAR MEMBER FIXEDLY CONNECTED TO SAID SUPPORTING CORE MEMBER AND ENVELOPING SAID INNER TUBULAR MEMBER, SAID OUTER TUBULAR MEMBER HAVING A CONICAL INNER SURFACE LOCATED OPPOSITE SAID CONICAL OUTER SURFACE OF SAID TUBULAR INNER MEMBER, AND A CYLINDRICAL INNER FACE MERGING INTO THE SMALLER END OF SAID CONICAL INNER SURFACE, SAID CYLINDRICAL INNER FACE HAVING A DIAMETER GREATER THAN THE DIAMETER OF SAID OUTER CYLINDRICAL SURFACE AND OF SAID OUTER CYLINDRICAL FACE AND EXTENDING IN AXIAL DIRECTION OVER SAID OUTER CYLINDRICAL SURFACE AND OVER SAID OUTER CYLINDRICAL FACE SO AS TO DEFINE WITH THE SAME AN ANNULAR EXTRUSION CHANNEL; WORM MEANS ON SAID OUTER CONCICAL SURFACE OF SAID INNER TUBULAR MEMBER; AND MEANS FOR ROTATING SAID INNER TUBULAR MEMBER SO THAT SAID OUTER CYLINDRICAL SURFACE OF SAID INNER TUBULAR MEMBER TRANSVERSELY MOVES FIBERS OF FIBROUS MATERIAL EXTRUDED THROUGH SAID EXTRUSION CHANNEL BY SAID WORM MEANS INTO A POSITION INTERCROSSING WITH OTHER FIBERS.