Electric heating – Heating devices – Combined with pressure application means
Patent
1984-01-26
1985-05-28
Bartis, A.
Electric heating
Heating devices
Combined with pressure application means
38 82, 200 6152, 219257, 219492, 340635, 340686, H05B 102, D06F 7526, G08B 2100
Patent
active
045202575
ABSTRACT:
An electronic safety device for automatically interrupting the supply of electric current to a heating resistor of an iron at the end of a predetermined interval of non-use, comprising a movable body adapted to control a position of contacts of an associated switch so that at least one opening-closing sequence of the switch contacts is obtained upon displacement of the movable body. Associated with the switch is a resistor bridge supplied with a rectified voltage E and comprising a first resistor R.sub.1 and a second resistor R.sub.2 in series with the switch contacts. A capacitor is connected to the terminals of resistor R.sub.2, a voltage V.sub.o being collected at the terminals of said resistor R.sub.1 and being applied to one input of a counter which is reset to zero each time voltage V.sub.o is higher than E/2, that is, upon closing of the contacts. The counter is connected to an input of a comparator for transmitting a voltage V.sub.1 when the counter attains a predetermined counting threshold. The comparator is connected to a trigger of a triac having one terminal connected to a current supply and another terminal connected in series to the heating resistor. The comparator is adapted to deliver turn-on pulses to the trigger as long as no voltage V.sub.1 is applied and to stop these turn-on pulses as soon as a voltage V.sub.1 is applied, thereby interrupting the current supply to the heating resistor.
REFERENCES:
patent: 2382587 (1945-08-01), Thomas
patent: 2470532 (1949-05-01), Thomas
patent: 3601729 (1971-08-01), Hierta
patent: 4130955 (1978-12-01), Baumgartner et al.
patent: 4203101 (1980-05-01), Towsend
patent: 4243875 (1981-01-01), Chang
patent: 4366366 (1982-12-01), Ekblad
Mieg Christian
Schwob Pierre
Bartis A.
Seb S.A.
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