Abrasive pad structure for portable sanding machine

Claim 1

AN ABRASIVE SHEET CARRYING PAD FOR PORTABLE POWEROPERATED SANDING MACHINES INCLUDING A FLAT BASE PLATE FORMED AT EACH END WITH A PAIR OF UPSTANDING SHOULDERS, THE SHOULDERS OF EACH PAIR BEING CONTIGUOUS TO THE SIDE EDGES OF SAID PLATE, SAID SHOULDERS BEING SPACED APART TRANSVERSELY OF THE PLATE IN A COMMON PLANE AND BEING SPACED INWARDLY FROM THE END EDGE OF THE PLATE, SAID PLATE BEING FORMED CONTIGUOUS TO EACH PAIR OF SHOULDERS WITH AN UPSTANDING LUG, A PIVOT PIN CARRIED BY SAID LUG AND AN ABRASIVE SHEET CLAMP MEMBER MOUNTED ON SAID PIVOT PIN AND HAVING AN ABRASIVE SHEET ENGAGING JAW PORTION EXTENDING TRANSVERSELY OF THE BASE PLATE OUTWARDLY OF SAID SHOULDERS, SAID JAW PORTION HAVING A LENGTH COMPARABLE TO THE WIDTH OF SAID BASE PLATE, A PAIR OF TORSION SPRINGS MOUNTED ON SAID PIVOT PIN AT OPPOSITE SIDES OF SAID LUG, EACH OF SAID SPRINGS HAVING ONE LEG THEREOF EXTENDING FORWARDLY AND UPWARDLY FROM SAID PIVOT PIN AND ENGAGING SAID CLAMP MEMBER IN AN AREA ABOVE THE HORIONTAL PLANE PASSING THROUGH SAID PIVOT PIN, THE OPPOSITE LEG OF EACH OF SAID PAIR OF SPRINGS EXTENDING REARWARDLY FROM SAID PIVOT PIN AND ENGAGING A SUPPORT LOCATED CONTIGUOUS TO SAID HORIZONTAL PLANE.