Idler pulley and end mounting for a chain saw

Claim 1

AN IDLER PULLEY AND END MOUNTING FOR A CHAIN SAW COMPRISING A FLAT SHEET METAL COLLAR HAVING A BORE THERETHROUGH DEFINED BY A WALL OF SAID COLLAR, SAID COLLAR WALL BEING IN THE FORM OF AN OUTER BEARING RACE, TWO SHEET METAL DISKS OF SUBSTANTIALLY UNIFORM THICKNESS ARRANGED IN BACKTO-BACK RELATION AND BEING OF A DIAMETER GREATER THAN THE DIAMETER OF SAID BORE, EACH DISK HAVING AN INTERMEDIATE ANNULAR PORTION DISPOSED WITHIN SAID BORE IN AXIALLY CENTERED RELATION RELATIVE TO SAID COLLAR AND SAID INTERMEDIATE ANNULAR PORTIONS BEING SECURED TOGETHER IN FACE-TO-FACE RELATION, SAID DISKS HAVING OPPOSED PART-CIRCULAR GROOVES DISPOSED CONCENTRIC WITH SAID COLLAR WALL AND DISPOSED IMMEDIATELY RADIALLY INWARDLY ADJACENT TO SAID COLLAR WALL, SAID GROOVES HAVING OPPOSED SURFACES DEFINING A GENERALLY C-SHAPED INNER RACE OPENING TOWARDS SAID OUTER RACE-FORMING COLLAR WALL, A PLURALITY OF BEARING BALLS MOUNTED WITHIN SAID INNER RACE IN DIRECT RIDING ENGAGEMENT WITH SAID OUTER RACE, AND SAID DISKS HAVING OUTER FLANGES EXTENDING RADIALLY OUTWARDLY OF SAID COLLAR WALL, SAID OUTER FLANGES BEING AXILLY SPACED AND HAVING SAID COLLAR POSITIONED THEREBETWEEN IN GUIDED RELATION.