| 摘要 |
An automatic switch for controlling an electronic circuit responsive to movement of a conductor blade from a first, or given, position relative to a lead in the switch, closing the circuit, to a second or different position relative to said lead, opening the circuit, said switch having a thruster positioned therein adjacent the conductor, said thruster being of given normal dimensions such that it will not move the conductor out of contact with the lead but being made of a material permeable and expansion-sensitive to an ambient gas or vapor, such as Freon for expanding it beyond its said given dimensions when in said vapor. On such expansion, the thruster engages the conductor and displaces it from said lead, automatically opening the switch and thus the circuit controlled thereby until such time as said vapor evaporates from the thruster and the latter returns to its normal dimensions. The conductor thereupon automatically closes the switch and the circuit controlled thereby.
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