Molding apparatus for sanding pad assembly

Claim 1

MOLDING APPARATUS FOR FORMING A PRODUCT BY MOLDING A PLASTIC MATERIAL ONTO A BACKING MEMBER ON ONE END, SAID APPARATUS COMPRISING: A BASE HAVING A MOLD CAVITY IN THE TOP THEREOF, SAID CAVITY HAVING A SIDE WALL WITH A PERIPHERY LARGER THAN THAT OF THE BACKING MEMBER AND A BOTTOM WALL WHICH HAS FORMED AT ITS RADIALLY OUTER EXTREMITY A RAISED, PERIPHERAL SEALING LIP, SAID SEALING LIP BEING OF A SIZE TO ENGAGE AND SUPPORT THE BACKING MEMBER AWAY FROM THE REMAINDER OF SAID BOTTOM WALL AND HAVING A PLURALITY OF RADIALLY EXTENDING VENT SLOTS THEREIN, PASSAGE MEANS IN SAID BOTTOM WALL INCLUDING SAID VENT SLOTS FOR COMMUNICATING SAID CAVITY WITH THE ATMOSPHERE, A COVER FOR SAID BASE ADAPTED TO BE CLAMPED TO SAID TOP THEREOF SO AS TO CLOSE SAID MOLD CAVITY, SAID COVER HAVING VENT OPENINGS THEREIN COMMUNICATING WITH THE ATMOSPHERE.