Mounting block to rotate coal cutter bits

Details Mounting block to rotate coal cutter bits Mounting block to rotate coal cutter bits

1980-02-23

1981-11-24

Purser, Ernest R.

Mining or in situ disintegration of hard material

Cutter tooth or tooth head

Tooth mounted on helical head portion or head with helical...

173114, E21C 3518

Patent

active

043020534

ABSTRACT:
A rotatable mounting block with a coal cutter bit which reduces the amount of wear to the bit. The cutter bit is fixed within the bore of a bit holder and moves in unison therewith within the mounting block. Positive rotation of the holder/bit is provided by a ratchet sleeve and pawl which interact with spiral slots on the lower extending end of the bit holder. The pawl prevents rotation of the ratchet sleeve in one direction (downward) so that the cutter bit will rotate during movement into the mounting block's bore as inwardly facing sleeve teeth are cammed in the slots of the bit holder. On the upward stroke of the bit/holder within the mounting block, the ratchet sleeve is free to rotate as a strong Belleville spring--also in the mounting block--forces them upward to the original position.

REFERENCES:
patent: 798416 (1905-08-01), Jackson
patent: 1573790 (1926-02-01), Rice
patent: 3539026 (1970-11-01), Sutliff et al.
patent: 3945681 (1976-03-01), White

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