Methods of making non-rigid rotative abrasive structures

Claim 1

IN THE METHOD OF FORMING AN ABRASIVE WHEEL COMPRISED OF AN ANNULUS OF JUXTAPOSED RADIALLY EXTENDING FLAP SECTIONS OF ABRASIVE SHEET MATERIAL HAVING OPPOSED NOTCHES THEREIN WHICH ALIGN TO DEFINE OPPOSED LATERAL GROOVES ADJACENT THE INNER PERIPHERY OF SAID ANNULUS AND WHEREIN ADJACENT FLAP SECTIONS ARE RIGIDIFIED AND FIRMLY RIGIDLY ADHESIVELY BONDED TOGETHER OVER A SUBSTANTIAL INNER END AREA TO FORM A RIGID REINFORCED INNER RIM PORTION IN SAID STRUCTURE, THE STEPS COMPRISING MANIPULATING INTO AN ANNULUS A BLOCK OF SAID NOTCHED FLAP SECTIONS ARRANGED IN SUPERPOSED FACE-TO-BACK RELATION, SAID BLOCK BEING TEMPORARLY BOUND TOGETHER AT THE END PORTIONS OF SAID FLAP SECTIONS FORMING THE INNER PERIPHERAL PORTION OF SAID ANNULUS BY A FLEXIBLE HOLDING MEMBER WHICH IS AFFIXED TO SAID BLOCK, INSERTING A CIRCULAR FORMING MEMBER INTO A GROOVE IN EACH OF SAID LATERAL SURFACES TO PERFECT THE SHAPE OF SAID ANNULUS, SAID SECTIONS EACH BEING PROVIDED WITH A COATING OF A LIQUID CURABLE ADHESIVE RESIN ON EACH SAID OVER A SUBSTANTIAL AREA ADJACENT THE RADIALLY INNER ENDS THEREOF, AND CURING SAID RESIN TO A HARD FIRM STATE.