Patent ID: 8127895

Claim:
A device removably attachable to a skateboard for use on a ground surface, the skateboard having a length direction and a width direction and a first wheel and second wheel, wherein the second wheel is offset in the width direction from the first wheel, and a third wheel and a fourth wheel, wherein the fourth wheel is offset in the width direction from the third wheel, and wherein the first and second wheels are offset in the length direction from the third and the fourth wheels and each wheel has a tread, the device comprising: four lobes, each lobe having an inner surface for engaging at least a portion of the tread of a different one of the four wheels of the skateboard and each lobe having an outer surface portion formed as a circular arc with a mid-point that engages the ground surface; and a central connecting member having a centroid and interconnecting the four lobes to restrain a rotation of the wheel with which that lobe is engaged, wherein the central connecting member and the four lobes are formed of a resilient material such that tension is exerted between the four lobes and the central connecting member to restrain a rotation of the wheel with which that lobe is engaged and to urge each of the wheels toward the centroid of the central connecting member, wherein the lobes are disposed angularly from the central member.