Chain saw cutter bar and method of manufacturing same

Claim 1

A CHAIN SAW CUTTER BAR COMPRISING A FLAT SOLID BAR PLATE HAVING AN INNER END, TWO LONGITUDINAL EDGES AND A CURVED OUTER END WITH A CURVED EDGE EXTENDING BETWEEN THE LONGITUDINAL EDGES, A CONTINUOUS PERIPHERAL GROOVE IN SAID EDGES AND OPENING OUTWARDLY THEREFROM ADAPTED TO RECEIVE DRIVING LUGS OF A SAW CHAIN WHEN MOUNTED ON THE BAR PLATE IN THE STANDARD MANNER, SAID GROOVE HAVING SECTIONS IN THE LONGITUDINAL EDGES DEEPER THAN NECESSARY FOR THE CHAIN LUGS, A NARROW GROOVE CUT IN THE BOTTOM OF EACH LONGITUDINAL SECTION OF THE PERIPHERAL GROOVE TO FORM SHOULDERS ON OPPOSITE SIDES OF SAID NARROW GROOVE, A WALL SECURED IN EACH LONGITUDINAL SECTION OF THE PERIPHERAL GROOVE AND BEARING AGAINST SAID SHOULDERS TO COVER SAID NARROW GROOVE AND THEREBY FORM AND OIL PASSAGE WITHIN THE BAR PLATE, EACH OF SAID OIL PASSAGES HAVING AN INLET OPENING OUT AT ONE END THEREOF FROM THE PLATE NEAR THE INNER END OF SAID PLATE AND AN OUTLET NEAR THE OTHER END THEREOF OPENING INTO THE PERIPHERAL GROOVE AT SAID CURVED OUTER END.