| 摘要 |
<p>1,031,857. Control systems for resistance heaters. GENERAL ELECTRIC CO. April 8, 1964 [April 30, 1963], No. 14558/64. Heading H2H. An electric blanket controlled normally by a thermal cycling switch 14 has an over-temperature device comprising a relay coil 118 shunted both by a diode 117 to produce unidirectional current in the coil and by a thermally responsive element 120 which shunts windings 121, 122 and hence the relay coil at high temperatures, thus causing a contact 115 to open the circuit. A resetting switch 28 is linked with another switch 30 to foil continued operation with the switch 28 jammed closed. The diode 117 may be replaced by a diode bridge to pass pure A.C. through the element 120 or alternatively a resistor shunted by a diode oppositely poled to diode 117 may be connected in series with the coil. A stop switch 31 is included in the circuit. The relay may be arranged to be selfresetting.</p> |
