Self-retaining sleeve and bit

Details Self-retaining sleeve and bit Self-retaining sleeve and bit

1976-09-07

1978-04-18

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...

175354, E21C 3518

Patent

active

040848566

ABSTRACT:
In a mining machine in which pick bits or point attack bits are held in a chain or wheel which moves next to coal or rock, a replaceable tool which is formed with a rear extension that is essentially cylindrical, that extension being split in circumferentially spaced slots so that portions will move resiliently in a radial direction. Outer radial projections interlock with annular surfaces or shoulders of a holding block to retain the tool in an operating position. The tool may be driven in or out of position without the need of clips or retaining rings. They may then rotate in the holding block to equalize wear on the tip.

REFERENCES:
patent: 3498677 (1970-03-01), Morrow
patent: 3865437 (1975-02-01), Crosby

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