| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling switch structure which respond rapidly as a simple structure and can avoid danger when current excessively flows. SOLUTION: A control mechanism is made from one rolling body 40 and one alloy piece 50. An operation portion 44 of the rolling body 40 is fitted into the rolling body 40 along with an elastic part, and an extension portion 441 of the operation portion 44 is exposed from a terminal portion of the rolling body 40. The operation portion 44 can be reciprocated transversely at the terminal portion inside the rolling body 40. If the alloy piece 50 is heated by an excessive current, the alloy piece 50 is deformed in the direction of the rolling body 40 to press a convex portion 442 of the operation portion 44. And then, the operation portion 44 is moved in transverse and in turn the extension portion 441 of the operation portion 44 is moved outward to escape an interception portion of a switch body 20 so that the terminal portion of the rolling body 40 falls off. A head part 43 of the rolling body 40 goes up relatively to be accessed to OFF position. An elastic contact piece 60 is opened from a pressing of the rolling body 40 to be moved upward so that contacts are released.
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