An exercise bike, comprising two footboards, six wheels, and four straight shafts with trapezoid-headed ends, is provided. Symmetrically arranged in the disk of each wheel are two eccentrical trapezoid apertures. The ends of the shafts are orthogonally inserted into the trapezoid apertures of the wheels, to form a wheel frame, thus avoiding the possibility of assembling the exercise bike improperly. The wheels are arranged in three lines, and the middle portions of the shafts are supported by bearings at the bottom of the boards and can rotate freely thereon. The bike can further be assembled into a safety-type exercise bike, or a massage-type one. When the footboards are threaded, the bike will move forward in a fluctuating manner. The various parts can leave the factory in separate packages for the customers to assemble on their own. The products can therefore be transported in large quantities and over long distances.
A three-wheeled device (10) for pedal-powered riding, wherein the device (10) provides a substantial but not excessive riding challenge. The preferred device (10) broadly comprises three wheels (12); two shafts (14); and two pedals (16). The wheels (12) are oriented parallel to one another so as to rotate about a common axis. Each shaft extends between and couples (14) two of the wheels (12) in an offset manner. Bearings (26) may be provided to facilitate movement of the shafts relative to the wheels (12) by reducing friction therebetween. Each pedal (16) is coupled with a different one of the shafts (14). For added safety, the pedals (16) may include non-slip contact surfaces (30) and light reflectors (32). In use, a rider stands on the pedals (16) and applies force thereto, with the force being transferred via the shafts (14) to the wheels (12) which are thereby caused to roll.
A manually propelled device includes two base modules having at least two wheels interconnected by a pedal element. The device is provided with at least four wheels which are parallel with each other. The pedal elements each interconnect two of the wheels and are fixed to the two interconnected wheels at points off-set from the centers of the two wheels. A shaft interconnects the centers of one of the wheels of each of the modules, thereby interconnecting the modules. Pedaling of the pedal elements by the feet of an operator serves to cause rotation of the wheels in a same rotating direction to propel the device in a selected linear direction.
