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US 4,062,593 AGranted
Mining machines
AssigneeCoal Industry (Patents) Limited
InventorsTerence John Gapper, Owen O'Neill
Life of this patent
Estimating the term…
Abstract
A linear potentiometer is attached to the ranging arm of a ranging arm shearer such that it slides on the upper flange of the face conveyor to sense the height of the cutter drum relative to the conveyor.
Claims5
A mining machine adapted to traverse on an armored face conveyor, said machine comprising:
- a body adapted to move on a track fixed with respect to the conveyor;
- a cutter head;
- an arm pivotably mounted on the body for movement about an axis, said arm supporting said cutter head remote from said axis;
- and
- a sensor carried on said arm for sensing the distance between the cutter head and the conveyor and for deriving a signal indicative of the distance, said sensor being engagable with the conveyor and comprising a telescopic assembly including a piston and cylinder arrangement and resilient biasing means for urging said arrangement toward engagement with the conveyor, said sensor further comprising a potentiometer arranged to sense variation in the effective length of the telescopic assembly and to derive said signal indicative to the sensed variation, which derived signal is fed to a steering mechanism of the machine.
2 more elements
Dependencies are inferred from the claim text.