Additional patent application to P 3200157.6 having the features described in the abstract on page 22 of the parent application and the following improvements: the steering linkage (10, 11) no longer has two bending points for folding together but only one pivot connection (17) inclined through about 45 DEG . The front wheels (5) which are not normally driven are also driven when loaded - for example on climbing stairs (16) - by a friction wheel clutch (18). Accidents in open country due to damage to the V-belt, engine or battery because of blockage of the traction device caused by the terrain are prevented by an extremely simple slip clutch combined with a V-belt drive (19). In the case of the large disc to be driven, the V-belt rests only with its inner surface on a flat belt disc (23). <IMAGE>
