Safety device at remote control of hydraulic or pneumatic machin

Details Safety device at remote control of hydraulic or pneumatic machin Safety device at remote control of hydraulic or pneumatic machin

1980-10-03

1982-11-30

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082563, 361193, H04Q 900, H01H 4732

Patent

active

043618367

ABSTRACT:
A safety device at remote control of hydraulic or pneumatic machine tools where electric signals are used for controlling hydraulic or pneumatic valves, for example machines comprising a selector valve for different hydraulic functions, which is controlled by electrohydraulic or electropneumatic converters (N), and where a control unit is capable by means of electric impulses to transfer orders via a cable to a receiver unit (H), which is capable to control said converters (N) via signal converters (L) and amplifiers (M) for amplifying received signals.
According to the invention the output of the receiver unit (H) is connected to a zero-detector (P), which is capable, after a certain predetermined time from detection that there is no output signal from the receiver unit (H), to detect whether or not there is an output signal from the respective amplifier (M) or corresponding means, and when there is an output signal from the respective amplifier (M), although there is no corresponding signal on the output of the receiver unit (H), to break the current supply to said amplifier (M).

REFERENCES:
patent: 3943973 (1976-03-01), Zettergren
patent: 3946287 (1976-03-01), Hopkins
patent: 4065747 (1977-12-01), Patten et al.
patent: 4150416 (1979-04-01), Heppenstall et al.

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