| 摘要 |
<p>A description is given of a four-wheeled pedal cycle that can be ridden on an asphalted road or on rails and can be enclosed by bodywork of different designs. The four-wheeled cycle comprises a pair of driving wheels on the rear axle and a pair of steering wheels on the forecarriage, similar to those of an ordinary bicycle. A tubular frame supports the forecarriage and rear axle and a double set of pedals, saddles, handlebars, brakes, transmissions and speed-change gears. The steering is done by means of a handlebar with rods and universal joints, and includes a steering lock to be used only when the vehicle runs on rails. The forecarriage with two forks connected by a bar is articulated in relation to the frame so that it can follow a bend in the rails when the steering is locked. Safe movement on rails is ensured by four retractile rollers (23, 24, 25), one for each wheel of the vehicle, said rollers being placed with their axes of rotation perpendicular to the rails (21, 22) and their revolving surfaces in contact with the inner edges of said rails.</p> |
