| 摘要 |
PROBLEM TO BE SOLVED: To prevent the theft of an electric-driven bicycle in a locked condition through transmission of the alarm buzzer by providing an alarm to which an alarm circuit provided with an oscillation sensor to sense the oscillation of a bicycle body and an alarm buzzer to make an alarm by conducting the oscillation buzzer on an OFF contact of a power supply switch. SOLUTION: When a tip of a stopper 9 is fitted to a locking part 3' of a rear end part of a locking bar 3 crossing between opening parts 2 of a lock body 1, and the locking condition of a lock A is kept, a power supply switch S separates a tip of a working contact piece 11 from a side edge of the locking lever 7, and keeps the electric circuit for driving a bicycle is in the OFF condition. An alarm D in which one end of an alarm circuit E is connected to an OFF contact (b) of the power supply switch S, keeps the operation waiting condition by the locking operation of the locking lever 7. The alarm circuit E is provided with an alarm buzzer 15 connected to an oscillation sensor circuit 13, and further provided with an intermittent transmission circuit 16, and a waiting circuit 17 to wait the alarm buzzer 15 in a transmittable manner after the prescribed time is elapsed since the OFF contact (b) is conducted. |
