Particle throwing apparatus

Claim 1

A THROWING WHEEL FOR BLASTING ARTICLES WITH PARTICLES, SAID WHEEL HAVING A ROTOR CARRYING RADIALLY DIRECTED VANES FOR CENTRIFUGALLY THROWING OUTWARDLY ABRASIVE PARTICLES THAT ARE FED TO THE INNER PORTIONS OF THE VANES; A JOURNALED SPINDLE ON ONE END OF WHICH THE ROTOR IS MOUNTED FOR ROTATION; A RADIAL FLANGE ON SAID SPINDLE END; A HOUSING COVERING THE ROTOR, FLANGE AND THE ADJACENT PORTIONS OF THE SPINDLE, A FIRST SEALING RING HELD WITHIN THE HOUSING ADJACENT THE INNER PORTION OF THE FLANGE FACE OPPOSITE TO THAT ENGAGED BY THE MOTOR, SAID RING EXTENDING TOWARD THE FLANGE, A MATING GROOVE IN THE FLANGE RECEIVING THE EXTENDING PORTION OF THE RING AND CLOSELY SPACED THEREFROM, A SECOND SEALING RING ENCIRCLING BUT SPACED FROM THE FIRST SEALING RING AND HELD BY THE HOUSING ADJACENT THE OUTER PORTION OF THE FLANGE, THE FLANGE HAVING A PERIPHERAL LIP PROJECTING INTO CLOSELY SPACED COOPERATION WITH THE OUTER FACE OF THE SECOND SEALING RING, THE LIP BEING MORE WIDELY SPACED FROM THE HOUSING AND THE SECOND SEALING RING HAVING ITS OUTER SURFACE GROOVED IN THE PORTION EXPOSED BY THE LAST-MENTIONED SPACED.