Grinding wheel with provision for coolant application

Claim 1

IN COMBINATION WITH A GRINDING TOOL HAVING A POWER DRIVEN DOWNWARDLY PROJECTING ROTATABLE SPINDLE ON WHICH IS REMOVABLY MOUNTED A CUP-SHAPED POROUS GRINDING WHEEL OF THE TYPE HAVING AN END WALL WITH A SUBSTANTIALLY FLAT UPPER SURFACE AND A CIRCUMFERENTIAL SIDE WALL WITH SUBSTANTIAL THICKNESS RADIALLY AND WITH A FLAT BOTTOM THAT PROVIDES THE WORK PERFORMING SURFACE OF THE WHEEL, MEANS FOR CONDUCTING LIQUID COOLANT TO THE WORK PERFORMING SURFACE OF THE WHEEL COMPRISING: A. A BOWL-SHAPED RESERVOIR MEMBER COAXIALLY SECURED TO THE SPINDLE ABOVE THE GRINDING WHEEL AND HAVING (1) A BOTTOM WALL WITH (A) A COAXIAL HOLE THEREIN THROUGH WHICH THE SPINDLE EXTENDS AND (B) A PLURALITY OF CIRCUMFERENTIALLY SPACED COOLANT OUTLET HOLES, (2) A CIRCUMFERENTIAL SIDE WALL WHICH EXTENDS UPWARDLY FROM THE BOTTOM WALL, AND (3) A DOWNWARDLY PROJECTING CIRCUMFERENTIAL RIM WHICH ENGAGES THE UPPER SURFACE OF THE GRINDING WHEEL AROUND THE MARGINAL EDGE THEREOF TO PREVENT ESCAPE OF LIQUID FROM BETWEEN THE RESERVOIR MEMBER AND THE WHEEL; B. MEANS ON THE TOOL FOR INTRODUCING LIQUID COOLANT INTO THE RESERVOIR MEMBER, SAID MEANS HAVING AN OUTLET ALONGSIDE THE SPINDLE; AND C. MEANS PROVIDING A COATING ON THE OUTER CIRCUMFERENTIAL SURFACE OF THE SIDE WALL OF THE WHEEL WHICH IS IMPERVIOUS TO LIQUID COOLANT, SO THAT LIQUID COOLANT INTRODUCED INTO THE RESERVOIR MEMBER AND PASSING DOWNWARDLY INTO THE PORES OF THE WHEEL THROUGH THE COOLANT HOLES IN THE RESERVOIR MEMBER IS CONSTRAINED TO FLOW DOWNWARDLY THROUGH THE PORES OF THE WHEEL AND TO LEAVE THE WHEEL THROUGH ITS WORK PERFORMING SURFACE.