Antitheft device for vehicle

A modular antitheft device for a steering system comprising:

• a lock body which is parallelepiped and is attachable to a steering shaft of the steering system, the lock body having a slide surface;
• a lock stopper provided so as to be able to slide while abutting the slide surface;
• a lock bar able to move integrally with the lock stopper, and in a state in which the lock stopper has been moved toward a steering shaft, the lock bar projects toward the steering shaft and engages with the steering shaft and locks the steering shaft, and in a state in which the lock stopper has been moved toward a side opposite the steering shaft, the lock bar moves toward the side opposite the steering shaft and releases locking;
• an urging device elastically urging the lock stopper toward the side opposite the steering shaft such that the lock bar is urged in a disengagement direction with respect to said steering shaft;
• a gear driven to rotate by driving force from a drive source;
• a lock arm provided so as to be interlocked with the gear and so as to be engageable with the lock stopper, and due to forward rotation of the gear, the lock arm moves the lock stopper such that the lock stopper approaches the steering shaft, and holds the lock stopper, and due to reverse rotation of the gear, the lock arm disengages said lock stopper such that the urging device urges lock bar in said disengagement direction;
• and
• a cam provided so as to be interlocked with the gear and so as to be engageable with the lock stopper, and due to reverse rotation of the gear, after said lock arm disengages said lock stopper, the cam moves the lock stopper such that the lock stopper moves away from the steering shaft, and holds the lock stopper such that the cam disengages the lock bar from the steering shaft if the urging device fails to cause such disengagement.

An antitheft system for a vehicle, comprising:

• a lock body which is parallelepiped and is attachable to a steering shaft of the vehicle, the lock body having a slide surface;
• a lock stopper provided so as to be able to slide while abutting the slide surface;
• a lock bar able to move integrally with the lock stopper, and in a state in which the lock stopper has been moved toward a steering shaft, the lock bar projects toward the steering shaft and engages with the steering shaft and locks the steering shaft, and in a state in which the lock stopper has been moved toward a side opposite the steering shaft, the lock bar moves toward the side opposite the steering shaft and releases locking;
• an urging device elastically urging the lock stopper toward the side opposite the steering shaft such that the lock bar is urged in a disengagement direction with respect to said steering shaft;
• a gear driven to rotate by driving force from a drive source;
• a lock arm provided so as to be interlocked with the gear and so as to be engageable with the lock stopper, and due to forward rotation of the gear, the lock arm moves the lock stopper such that the lock stopper approaches the steering shaft, and holds the lock stopper, and due to reverse rotation of the gear, the urging device urges the lock bar in said disengagement direction;
• and
• a cam provided so as to be interlocked with the gear and so as to be engageable with the lock stopper, and due to reverse rotation of the gear, and after the lock arm disengages said lock stopper, the cam moves the lock stopper such that the lock stopper moves away from the steering shaft, and holds the lock stopper such that the cam disengages the lock bar from the steering shaft if the urging device fails to cause the lock bar to disengage from the steering shaft.