Anti-theft devices on motor vehicles

Claim 1

In an anti-theft device for a motor vehicle, of the type comprising a bolt restored by a spring to the position for locking an element essential to the motion of the vehicle, a lock comprising a stator and a rotor which is actuated by a coded key and which in the course of its rotation causes the bolt to be drawn back into the unlocked position, in opposition to the action of the said spring, and a safety device interacting with the key in order to prevent the bolt from returning to the locked position as long as the key has not been at least partly extracted from the rotor, the provision of a lever serving as said safety device accommodated in the rotor and partly projecting into the key channel of the rotor, the said lever pivoting about an axis perpendicular to the said rotor axis, elastic means for keeping the lever in its two positions, the said lever comprising a boss interacting with the point of the key, a supplementary part interacting with a ramp in order to tilt the lever from the first to the second position under the thrust of the point of the key on the said boss, the said lever also comprising a tooth, accommodated in the key channel in the second position and releasing the said key channel in the first position, the key comprising a through-slot in which the tooth of the said lever is accommodated in its second position.