| 摘要 |
It comprises an electric switch whose movable blade 2, which carries a contact 8 and a pivot 9, acting as lock for members for holding the door in a closed position, is formed by an entirely bimetallic element, the body of which incorporates, as well as the two layers of a metallic nature 2a, 2b and different coefficient of expansion, which are known per se, at least one third layer 2c made from a material which is a good conductor of electricity, such as copper, said blade 2 of the switch having associated with it an electrical heating element 14 placed adjacent to a widened portion 18 of the movable blade 2. <IMAGE>
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