Mechanical burglar alarm for vehicles

This invention proposes a mechanical burglar alarm for vehicles, provided with means apt to signal break-in attempts. In particular it is the matter of a mechanical burglar alarm, addressed to engage one or more controls of the vehicle to avoid its operation, associated with a sensor (10) able to detect movements or vibrations of a certain importance given to the burglar alarm and to generate a signal which activates a transmitter (15), which sends a SMS to a prefixed telephone number, which can preferably match with the portable phone number of the car owner. In this way it is possible to immediately signal the break-in attempt, without the intervention of noisy devices such as sirens or the like and without forewarning the one who is trying to force the burglar alarm.