Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1974-07-03
1976-03-09
Heyman, John S.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
328 6, 340227R, 340228R, 331 66, H01H 3732
Patent
active
039433862
ABSTRACT:
The device comprises flame detection means and a generating circuit adapted to deliver a signal when a flame signal, generated by the flame detection means, is applied to one of its inputs. The generating circuit is arranged so as to be unable to deliver an actuating signal in the case of failure of one of its elements, even if a flame signal is applied to said input. The circuit comprises oscillator means including a triggering input adapted to receive a triggering signal of low value and means for applying the flame signal to said triggering input. The oscillator means is arranged to generate a periodic signal of substantially constant peak to peak amplitude and of value substantially higher than that of the triggering signal, when a signal appears on said triggering input having a value between pre-determined limits.
REFERENCES:
patent: 3378829 (1968-04-01), Alafi et al.
patent: 3414739 (1968-12-01), Paidosh
patent: 3671815 (1972-06-01), Eberle et al.
patent: 3701137 (1972-10-01), Hulsman
patent: 3710149 (1973-01-01), Thomson
Constructions Electriques R.V.
Heyman John S.
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