Cutter assembly

Details Cutter assembly Cutter assembly

1974-10-29

1976-03-23

Murtagh, John E.

Mining or in situ disintegration of hard material

Cutter tooth or tooth head

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

299 91, E21C 1300

Patent

active

039456811

ABSTRACT:
In known cutter assemblies, a cutter bit is dragged through a formation, thereby producing an unbalanced moment on the cutter bit which causes it to rotate. However, cuttings can lodge between the cutter bit and the holder, resulting in a frictional force greater than the unbalanced moment tending to rotate the cutter bit. The dragging of the cutter bit through a formation without its rotating causes the cutter bit to wear rapidly, necessitating its frequent replacement. The subject invention proposes to overcome the frictional force and to thereby increase the wear life of the cutter bit, by providing means whereby rotation is imparted to the cutter bit upon its initial contact with a formation. Thus, the inventive cutter assembly has a longitudinally and angularly extending groove situated on one of the cutter bit and the holder and a follower located on the other of the holder and the cutter bit. The follower engages the groove and moves therealong as the cutter bit moves longitudinally relative to the holder, thereby causing rotation of the cutter bit about its longitudinal axis relative to the holder.

REFERENCES:
patent: 2728556 (1955-12-01), House
patent: 2754086 (1956-07-01), Summers
patent: 3399928 (1968-09-01), Robbins
patent: 3652130 (1972-03-01), Elders
patent: 3697137 (1972-10-01), Krekler
patent: 3833264 (1974-09-01), Elders

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