Patent ID: 8029005

Claim:
An immobilizer for immobilizing a wheel, the immobilizer comprising: an initiation unit movable by magnetic forces acting on said initiation unit, the immobilizer for being activated by the movement of the initiation unit, the initiation unit having first means which compensate for the effects of disturbance forces acting on a part of the initiation unit and thus prevent significant movement of the initiation unit, and the initiation unit having second means for causing the initiation unit to be moved to an initiating position by magnetically caused forces, the first means having a lever mounted for rotation about a shaft, the lever having two lever arms, and one of the lever arms having a weight, the first means having a single-armed lever mounted for rotation about a further shaft, a rotational axis of the shaft and a rotational axis of the further shaft being parallel to an axis of the wheel, the single-armed lever having a permanent magnet attached thereto, the lever and the single-armed lever having an operative connection existing between one another such that forces which act on the lever and the single-armed lever compensate for one another and do not produce any significant movement of the initiation unit, and a magnetic force acting solely on the single-armed lever causes the initiation unit to be moved to the initiating position.