Patent ID: 8215672

Claim:
A control device for controlling a tread contact condition of a vehicle wheel, the control device comprising: a track treading piece insertable under and in contact with a tread of the vehicle wheel, the track treading piece being carried by a carrying mover of an endless member in a closed curve orbit; a controlling unit movable between a work position, wherein the track treading piece is disposable between the tread of the wheel and a ground surface, and a non-work position, the controlling unit including a linking part, a positioning part and the carrying mover, the linking part connecting the controlling unit to a vehicle and the positioning part being detachably connected to the linking part; an adjuster controlling an area of the track treading piece contacted by the tread of the wheel, the adjuster comprising at least one of: an angle adjustment assembly that adjusts an angle of a retainer housing the carrying mover, or a rotating plane of the track treading piece, the angle adjustment assembly comprising at least one of a hinge, a slide, or a material selected for its deformation properties; and, a rotational adjuster for rotating a portion of the track treading piece relative to the carrying mover; wherein the track treading piece comprises: a connecting part connecting a deformable part of the track treading piece to the carrying mover, the deformable part being elastically deformable by a force and restituting after deformation; a contacting part rotating the carrying mover as a result of contact with the tread of a wheel or a ground surface, and a trodden part controlling the tread contact condition by applying a force upon a controlling tip of the track treading piece.