Double-action antitheft apparatus for vehicles suitable to be connected and trailers equipped with such a device

The anti-theft device consists of a brake lever lock in the form of a rigid bar which can be slid along the chassis of a towed vehicle, e.g. between flanges, so that its end (2a) prevents the lever being released, and a cover (15) for the ring (16) or towing ball on the end of the towbar. The rod is made e.g. from a metal alloy which is resistant to cutting, and the ring cover is in the form of one or two plastes fitted over the hole in the ring. The two are connected by a chain (13) and padlock to prevent either being moved.