| 摘要 |
A compact gas-expansion-type power source breaker by which a power supply circuit can be forcedly and surely isolated only in case of abnormalities such as short-circuiting of a wire harness or collision of road vehicles is provided. A lock 18 for constraining movement of a shaft 16 is set in a locked state by means of pushing force for constraining the movement of the shaft 16 forcedly provided by a reset spring 19 on one hand, and is connected via a lock operation plate 20 with a piston 21 for forcedly providing a reverse pushing force beyond the pushing force of the reset spring 19 sublimation of a gaseous actuating reagent 23 contained in a igniter 22 on the other hand. Once a circuit-cut signal is applied to the igniter 22, the gas actuating reagent 23 will vaporize or sublimate, and the piston 21 will operate to make the lock 18 released forcedly from the shaft 16, only when the piston 21 is provided with the reverse pushing force beyond the pushing force of the reset spring 19 by means of gases generated by the vaporization or sublimation of the gaseous actuating reagent 23. Consequently, it can be avoided that the shaft may move slidingly due to any other causes such as impulse, vibration than the vaporization or sublimation of the gaseous actuating reagent 23, resulting in the isolation of the power supply circuit.
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