Rock crushing device and a method thereof

Details Rock crushing device and a method thereof Rock crushing device and a method thereof

1985-10-23

1988-01-26

Novosad, Stephen J.

Mining or in situ disintegration of hard material

Automatic control; signaling or indicating

Of hard material disintegrating machine

299 21, E21C 3706

Patent

active

047213396

ABSTRACT:
A rock crushing device which crushes a rock by an expandable member which is, after being inserted into a borehole formed in the rock, expanded by pressure of a liquid material injected thereinto, including a liquid pressure measuring device provided in a liquid supply hose and a processor connected to the liquid pressure measuring device for processing the liquid pressure converted into electric signals and the time interval during which the liquid pressure is measured, wherein a valve provided in the liquid supply hose is controlled to be closed when the value of the value corresponding to the decreased pressure of liquid material of the liquid pressure measured by the processor exceeds a predetermined value.

REFERENCES:
patent: 2211243 (1940-08-01), Meyer
patent: 4301731 (1981-11-01), Fitzgerald

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