Grinding or abrading tool

Claim 1

A GRINDING WHEEL COMPRISING AN AXIALLY EXTENDING HUB HAVING A BORE THEREIN ADAPTED TO RECEIVE A DRIVE SHAFT, A PAIR OF ANNULAR RADIALLY EXTENDING THIN-WALLED METAL CHEEK PLATES IN AXIALLYSPACED RELATIONSHIP ALONG SAID HUB, AN ANNULAR AXIALLY EXTENDING THIN-WALLED METAL RIM PLATE EXTENDING AXIALLY BETWEEN THE RADIALLY OUTER ENDS OF SAID CHEEK PLATES AND INCLUDING RADIAL FLANGES AT EACH END THEREOF, MEANS CONNECTING SAID HUB, CHEEK PLATES AND RIM PLATE FOR ROTATION TOGETHER AND TO FORM A CHAMBER WITHIN SAID WHEEL, AN ABRASIVE, THERMALLY CONDUCTIVE MEANS SECURING SAID ABRASIVE TO SAID RIM PLATE BETWEEN SAID FLANGES EXTERNALLY OF SAID CHAMBER, AIR INLET MEANS IN SAID WHEEL COMMUNICATING WITH SAID CHAMBER, AND AIR OUTLET MEANS IN AT LEAST ONE OF SAID FLANGES OF SAID RIM PLATE COMMUNICATING WITH SAID CHAMBER WHEREBY, DURING ROTATION OF SAID WHEEL BY A DRIVE SHAFT, AIR MAY FLOW THROUGH SAID AIR INLET MEANS INTO SAID CHAMBER AND ACROSS THE SURFACE OF SAID RIM PLATE INTERNALLY OF SAID CHAMBER AND THROUGH SAID AIR OUTLET MEANS TO DISSIPATE HEAT FROM SAID RIM PLATE.