Patent ID: 7040713

Claim:
An attachment device for an auxiliary wheel, releasably attachable to a wheel of a vehicle, comprising a coupling part, provided on the auxiliary wheel, with coupling members held therein, and a holding part, provided on the wheel of the vehicle, with corresponding receiving parts for the coupling members, which coupling members are engaged and held in the receiving parts in the state of the auxiliary wheel being attached to the wheel of the vehicle, in which state the auxiliary wheel is aligned coaxially to the wheel of the vehicle, wherein the coupling members are designed as bolts, each of which is: aligned substantially parallel to the wheel axle of the auxiliary wheel, connected to the wheel rim of the auxiliary wheel, and has a head on the end region remote from the wheel rim, and wherein the receiving parts disposed on the holding part are slot-shaped recesses having: an insertion zone into which zone the heads of the respective bolts are insertable through displacement of the auxiliary wheel in wheel axle direction, and a retaining zone, with protruding pieces, into which zone the heads of the bolts are pushable through movement of the auxiliary wheel in the plane running substantially perpendicular to the wheel axle, are supportable on the protruding pieces and are maintainable in this position through locking means, the locking means each comprising an axially displaceable locking bolt which is borne in a guide bush, which guide bush is disposed on the plate provided on the auxiliary wheel in such a way that in the state of the auxiliary wheel being attached to the wheel of the vehicle the locking bolt is insertable with the one end region in the corresponding insertion zone of the slot-shaped recess, and makes impossible a movement of the auxiliary wheel with respect to the wheel of the vehicle in this locked state.