Pre-start warning device for a machine

Details Pre-start warning device for a machine Pre-start warning device for a machine

1979-04-02

1981-06-02

Purser, Ernest R.

Mining or in situ disintegration of hard material

Automatic control; signaling or indicating

Of hard material disintegrating machine

173 3, 175 38, 299 81, E21C 3504

Patent

active

042708001

ABSTRACT:
A machine pre-start warning device comprises at least one water spray nozzle and at least one temperature dependent resistor, the or each temperature dependent resistor being located with respect to a nozzle as to lie in the water jet emitted in use by the nozzle. The temperature dependent resistor is connected to a control circuit to actuate the control circuit upon sensing a water jet which circuit enables machine start-up to occur when the circuit is actuated and which otherwise prevents start-up from occurring.

REFERENCES:
patent: 2312291 (1943-02-01), Tyson
patent: 2576808 (1951-11-01), Perkins
patent: 2640958 (1953-06-01), Davis
patent: 2665129 (1954-01-01), Durbin et al.
patent: 2741468 (1956-04-01), Alspaugh
patent: 3290576 (1966-12-01), Jensen et al.
patent: 3398690 (1968-08-01), Deaton
patent: 3609053 (1971-09-01), Klem
patent: 3980338 (1976-09-01), Weber
patent: 4068893 (1978-01-01), Weirich

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