Paper machinery

Claim 1

IN PULPING APPARATUS OF THE CHARACTER DESCRIBED FOR LIQUID SLURRY STOCK INCLUDING A TUB FOR RECEIVING A QUANTITY OF STOCK AND A BEDPLATE MOUNTED IN A WALL OF THE TUB AND HAVING AN ANNULAR WORKING SURFACE COMPOSED OF SPACED SMOOTH AREAS HAVING GROOVES THEREBETWEEN PROVIDING EDGES ON SAID SMOOTH AREAS, THE COMBINATION OF A ROTOR INCLUDING A BODY MOUNTED FOR ROTATION CONCENTRICALLY OF SAID BEDPLATE, A PLURALITY OF VANES ON SAID ROTOR BODY PROJECTING OUTWARDLY THEREFROM IN OVERHANGING RELATION WITH A SUBSTANTIAL PORTION OF SAID BEDPLATE, MEANS MAINTAINING EACH SAID VANES SPACED A PREDETERMINED RELATIVELY SMALL DISTANCE FROM THE PLANE DEFINED BY SAID SMOOTH AREAS OF SAID WORKING SURFACE TO DEFINE A STOCK WORKING SPACE THEREBETWEEN, MEANS FOR ROTATING SAID ROTOR IN THE DIRECTION TO CAUSE SAID VANES TO PRODUCE DISCHARGE OF THE STOCK OUTWARDLY OF SAID BEDPLATE, MEANS FORMING A LEADING EDGE SURFACE ALONG A SUBSTANTIAL PORTION OF EACH OF SAID VANES WHICH IS INCLINED TOWARDS THE PLANE OF SAID WORKING SURFACE TO DEFINE AN ANGLE OF LESS THAN 90* AS MEASURED BETWEEN SAID PLANE AND SAID LEADING EDGE SURFACE OF EACH SAID VANE FOR FORCING THE STOCK TOWARDS SAID WORKING SURFACE OF SAID BEDPLATE AND INTO SAID WORKING AREA IN RESPONSE TO ROTATION OF SAID ROTOR, AND SAID LEADING EDGE OF EACH SAID VANE COOPERATING WITH SAID BEDPLATE TO PRODUCE A PREDOMINATELY RUBBING ACTION ON THE STOCK BETWEEN THE VANES AND THE BED PLATE WHILE CREATING HYDRAULIC PRESSURE AND TURBULENCE OPERATIVE TO PROVIDE HIGHLY EFFECTIVE PULPING AND DEFIBERING WITH A MINIMUM OF CUTTING ACTION ON THE SOLID MATTER IN THE STOCK.