Mining apparatus

Details Mining apparatus Mining apparatus

1980-11-24

1982-05-18

Purser, Ernest R.

Mining or in situ disintegration of hard material

Automatic control; signaling or indicating

Of hard material disintegrating machine

405302, E21D 2314

Patent

active

043301541

ABSTRACT:
A control means for use in a mining apparatus includes a radiation-emitting device on a cutting machine, a number of receiving devices, one associated with each roof support of the apparatus, for receiving radiation from the radiation-emitting device as the machine passes a receiving device, whereby a main control signal is generated, and advance-initiating means for each roof support, responsive to a command signal. A main conductor is connected to the receiving devices for carrying a main control signal, and disabling means is associated with each advance-initiating means and main conductor for rendering a said advance-initiating means non-responsive to a command signal applied to that means when the main control signal is above a pre-determined value. Attenuating means associated with the main conductor between each pair of roof supports is provided for gradually reducing the main control signal to a value below said pre-determined value.

REFERENCES:
patent: 3320001 (1967-05-01), Allen et al.
patent: 3489460 (1970-01-01), Cooper
patent: 3531159 (1970-09-01), Schmidt
patent: 3826535 (1974-07-01), Fujimori et al.
patent: 4099781 (1978-07-01), Sawayama et al.
patent: 4146271 (1979-03-01), Ward et al.

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