| 摘要 |
An antitheft lock device of an automotive vehicle ignition switch system comprises a member mounted for sliding movement radially of the rotor of a cylinder-type ignition lock, the member being moved radially outwardly by insertion of the key into the rotor until the radially outer end of the member is flush with the circumferential surface of the rotor. A cylindrical housing embraces the cylinder lock, and a switch control element is slidable in a radial slot in this housing and its radially inner end projects into the radial slot mounting the sliding member, when the key is withdrawn from the lock. In its radially inner position, the switch control element allows opening of an alarm switch. When the key is inserted into the lock, the sliding member is moved radially outwardly and the switch control element is displaced radially outwardly to close the alarm switch. The alarm switch is cooperable with another switch, such as the door-operated switch, so that, if the driver opens the door to leave the car without withdrawing the key from the ignition switch, an alarm is energized. This alarm may be a lamp, a buzzer, or a similar device.
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