초록 ▼

A protective signaling device for the prevention of theft of an automobile, which is arranged to generate an alarm only when the engine of the automobile is started without the use of its ignition key, i.e. without switching an ignition switch of the automobile on. The device includes a pickup capab

A protective signaling device for the prevention of theft of an automobile, which is arranged to generate an alarm only when the engine of the automobile is started without the use of its ignition key, i.e. without switching an ignition switch of the automobile on. The device includes a pickup capable of detecting a radio wave generated as an electrical noise when the engine is started and of generating a first detection signal upon detection of the radio wave, and a detector adapted for generating a second detection signal when the ignition switch is in the off position. Means is provided for allowing the actuation of an alarm only upon receipt of both of the first and second detection signals at the same time.

대표청구항 ▼

A signaling device for indicating the attempted theft of an automobile, said automobile having an internal combustion engine provided within an engine compartment and adapted for starting operation by an ignition switch with the simultaneous generation of a radio wave, said device comprising: first

A signaling device for indicating the attempted theft of an automobile, said automobile having an internal combustion engine provided within an engine compartment and adapted for starting operation by an ignition switch with the simultaneous generation of a radio wave, said device comprising: first detecting means provided within the engine compartment for detecting the radio wave generated upon operation of the engine and adapted for generating a first detection signal upon detection of the radio wave; second detecting means coupled to the ignition switch and adapted for generating a second detection signal when the ignition switch is in the off position; means coupled to said first and second detecting means and capable of generating an actuation signal only when supplied with both of said first and second detection signals simultaneously; and alarm means having said actuation signal as its input and being adapted for signaling an alarm upon receipt of said actuation signal.