| 摘要 |
A rotatable cutting bit (10), and rotatable cutting bit-bit holder (20) and washer (19) that have increased wear resistance characteristics. The washer includes a front face (44) and a generally flat gear face (48), said front face has a plurality of ridges (55), said ridges each have a top face forming a bearing surface for the cutting bit to enhance rotation of the cutter bit and the flat rear face reduces rotation of said washer. The relative rotation between the rear face (48) of the washer and front of the block face (23) is reduced in the present invention. The improved wear resistance properties of the invention reduce the amount of necessary maintenance of rotary drums in the field resulting in reduced downtime and increased productivity.
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