| 摘要 |
A tricycle has a frame constituted by a longitudinal member connected to an ob¬ lique strut, terminating in a head tube in which the fork stem of the front wheel of a common bicycle is inserted. A carriage supporting the seat is free to slide on the longitudinal member; two quick-coupling pedals are also pivoted. The propulsion, similar to rowing, employs two rods articulated together, of which the longer rod is pivoting on the longitudinal member while the other rod is con¬ nected to a handle free to rotate in order to control the remote steering. Fixed to the handle is a rope wound on a pulley equipped with an internal spring rewind- ing mechanism, coupled in rotation to the pin of a sprocket wheel of the chain drive by means of a freewheel bearing. The pulley is inside a housing integral with the stem of the fork. The rope continues from the handle to the seat, to which it is fixed, for an additional segment of length such that it is already ten- sioned when the configuration of rods and seat is that of full-forward rowing configuration, such that the additional segment remains constantly tensioned during the backward translation of the seat due to the thrust of the legs.
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