Sharpening means for chain saws

Claim 1

IN AN ENGINE DRIVEN CHAIN SAW HAVING AN ENDLESS SAW CHAIN DRIVEN BY A DRIVING SPROCKET, DEPTH GAUGES AND CUTTING ELEMENTS EXTENDING OUTWARDLY FROM SAID SAW CHAIN, SAID DEPTH GAUGES AND SAID CUTTING ELEMENTS HAVING OUTER CIRCUMFERENTIAL SURFACES, EACH OF THE CUTTING ELEMENTS AND DEPTH GAUGES ON SAID CHAIN BEING POSITIONED AND BEING OF SUCH LENGTH SO THAT THEIR RESPECTIVE CUTTING EDGES AND OUTER CIRCUMFERENTIAL SURFACES TRAVEL THROUGH AN ARC AROUND SAID SPROCKET, THE CENTER OF SAID ARC BEING COINCIDENT WITH THE CENTER OF SAID SPROCKET; SAW CHAIN CUTTING ELEMENT SHARPENING MEANS ON SAID CHAIN SAW ADJACENT THE CHAIN DRIVING SPROCKET, SAID SHARPENING MEANS COMPRISING: A WHETTING MEMBER IN A HOLDER, SAID HOLDER PIVOTALLY MOUNTED ON SAID CHAIN SAW SO AS TO BE MOVABLE TO A POSITION SO THAT A POINT ON THE SURFACE OF SAID WHETTING MEMBER LIES ON SAID ARC; MEANS TO PIVOT SAID HOLDER TO SAID POSITION; SPRING MEANS TO BIAS SAID HOLDER AWAY FROM SAID POSITION; AND MEANS TO OSCILLATE SAID HOLDER AND SAID WHETTING MEMBER TRANSVERSELY WITH RESPECT TO SAID PIVOT.