| 摘要 |
PROBLEM TO BE SOLVED: To make a power source automatically interruptible when an earthquake breaks out, by electrically interrupting the circuit between the input/ output terminals when external vibration is detected in one of three power circuit breakers mechanically detecting the vibration in the mutually orthogonal directions. SOLUTION: When an earthquake breaks out, a housing 11 is vibrated, this vibration is transmitted to a weight 37 via a plate spring 33, and the weight 37 is vibrated. Then, the inside end of the spring 33 is vibrated, and a connection plate 31 mounted here is vibrated. Since a conductive plate 15 is fixed to a supporting part 13, the connection plate 31 is separated from the conductive plate 15. Since an interruption plate 21 is moved inward by a coil spring 25, when the connection plate 31 is separated from the conductive plate 15, the interruption plate is advanced therebetween, in this way, the connection plate 31 and the conductive plate 15 are placed completely in a contactless condition. Thus by electrically interrupting between the two conductive plates 15 31, the circuit between input/output terminals is placed electrically in a non-conductive condition. |
