Patent ID: 7073799

Claim:
A rolling device to be used on the ground which is asymmetrically steered by leaning sideways, consisting of an upper boot or boot mounting device, a frame attached to the upper boot and at least one steering mechanism, the steering mechanism consisting of one pair of wheels oriented side by side, wherein the two wheels are rotatably affixed to two wheel holders and wherein the two wheel holders are pivotably interconnected using an upper horizontal cross-guide and a lower horizontal cross-guide so that a parallelogram or trapezium-like closed fourbar linkage results, wherein the two horizontal cross-guides are rotatably affixed each to the frame, wherein the direction of the rotation axes makes a solid angle alpha with the direction of the pivot axes of the closed fourbar linkage, wherein the two cross-guides and the frame have bore-holes which accommodate axles, bearings or spherical bushings allowing rotation around the said rotation axes, the said bore-holes being positioned so that the vertical projection of the said rotation axes onto the ground each make a solid angle beta beyond zero to the vertical projection of the pivot axes of the closed fourbar linkage onto the ground.