Apparatus for wet-screening a mixture of fine abrasive particles

Claim 1

APPARATUS FOR WET-SCREENING A MIXTURE OF FINE ABRASIVE PARTICLES AND THE LIKE COMPRISING: A ROTATABLY MOUNTED GENERALLY CYLINDRICAL SCREENING DESK HAVING ITS AXIS SUBSTANTIALLY HORIZONTAL AND DEFINING A PLURALITY OF LONGITUDINALLY DISPOSED SLOTS; MEANS FOR FEEDING THE MIXTURE TO BE TREATED AS A LAYER OF SUBSTANTIALLY UNIFORM THICKNESS TANGENTIALLY ONTO THE CONCAVE SIDE OF SAID SCREENING DECK IN OPPOSITE DIRECTIONS SUBSTANTIALLY PERPENDICULAR TO THE LONGITUDINAL AXIS THEREOF; MEANS FOR ROTATING SAID CYLINDRICAL SCREENING DECK; MEANS FOR COLLECTING THE OVERSIZE FRACTIONS OF THE MIXTURE; MEANS FOR COLLECTING THE UNDERSIZE FRACTIONS OF THE MIXTURE; SAID FEEDING MEANS BEING ABOVE THE LOWEST PORTION OF SAID CYLINDRICAL SCREENING DECK AND SAID FEEDING MEANS INCLUDING DOWNWARDLY FACING MOUTHPIECES; AND CLEANING MEANS FOR CLEANING THE BOTTOM PORTION OF THE CYLINDRICAL SCREENING DECK INCLUDING A BRUSH, THE HAIRS OF WHICH ARE OPERATIVELY MOVABLE IN THE SLOTS; AND MEANS TO MOVE SAID BRUSH IN A PLANE PARALLEL TOTHE SLOTS.