Patent ID: 7445062

Claim:
A reamer that includes a carrier ( 1 ) which is supported by a rotatable centrally mounted rod ( 2 ), the carrier having disposed thereon a plurality of cutters ( 3 ), the cutters being mounted in fasteners ( 4 ) on the carrier with cutter shafts ( 5 ) supported at opposite ends in the fasteners, the cutters having a frustoconical shape with a narrower end of the cutters facing inward toward the centrally mounted rod in the carrier, the cutters each including a conical outer barrel ( 7 ), a filling lubricating nipple ( 17 ) provided in each cutter shaft ( 5 ) on the cutter end wall of larger diameter and opening into a passageway ( 16 ) that extends longitudinally in the cutter shaft and that connects with a transverse passageway ( 18 ) which opens out into a bearing-accommodating space ( 13 ) in each cutter, for delivering lubricating grease to said bearing-accommodating space at a position beyond the innermost bearing ( 9 ), nearest said rod, of bearings ( 9 , 10 ) disposed between the outer barrel of each cutter and the shaft of each cutter as seen from the cutter end of largest diameter, and another lubricating nipple ( 19 ) provided on the same cutter end wall as said filling lubricating nipple ( 17 ) and functioning to allow lubricating grease to be released from said bearing-accommodating space ( 13 ).