US Patent 8414000 One piece flexible skateboard

A flexible skateboard may include a pair of direction casters mounted for steering rotation on a twistable one piece skateboard with a multi-arm spring return assembly using pivoting stops associated with the wheel fork and non-pivoting stops mounted to the skateboard. Centering spring arrangements including range or rotation limitations such as hard stops are included. One or two dual wheel assemblies may be exchanged for the single wheel assemblies for ease or riding or learning how to ride. One piece skateboard bodies are formed by rigidly connecting together multiple pieces of the same or similar plastic molded parts to form a bridge like connecting member having increased structural strength for its weight.