Cutter bit assemblies and arrangements for use with mining or tu

Details Cutter bit assemblies and arrangements for use with mining or tu Cutter bit assemblies and arrangements for use with mining or tu

1990-10-22

1992-03-03

Bagnell, David J.

Mining or in situ disintegration of hard material

Miscellaneous

299 93, F21C 2744

Patent

active

050926608

ABSTRACT:
A cutter bit assembly for a mining or tunnelling machine has a cutter shank detachably fitted into a socket of a holder. To secure the shank in position a piston is displaced to cause pressure fluid to flow into a working chamber and act on a piston at one end of a rod-like securing element. The element is forced against a surface of the shank to urge the shank about a pivot and this in turn thrusts rear support surfaces of the cutter and the holder together. To release the cutter the pressure fluid is relieved and spring force displaces the securing element away from the shank. In this released condition, the cutter can be swivelled about the pivot and withdrawn from the socket.

REFERENCES:
patent: 2912774 (1959-11-01), McCrary

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