US Patent 7552934 Pedaling vehicle having exercising function

A pedalling vehicle includes a main body, two control handles, two drive links, and a transmission link. The main body includes a front frame a front wheel, a rear frame, two rotation devices, two rear wheels, two cranks, and two connecting members. The rotation devices are connected by the transmission link through connection of the connecting members so that the rotation devices are rotatable synchronously and the rear wheels are movable with the rotation devices synchronously. Thus, the two rear wheels are turned synchronously by connection of the transmission link so as to turn and change the travel direction of the pedalling vehicle exactly.