| 摘要 |
A non-motorized tricycle including: a frame having a seat for supporting a rider; a front wheel and two rear wheels; a steering member pivotably supported by the frame and supporting the front wheel; and a crank drive mechanism for rotating the rear wheels and propelling the tricycle, the crank drive mechanism including: a pedal crank rotatably supported by the frame and having crank portions and pedals engageable by the feet of the rider; a bracket secured to, and extending downwardly from, the frame; a auxiliary crank member rotatably mounted in the bracket and having two first crank portions and two second crank portions; a rear axle rotatably mounted to the frame and secured to the rear wheels, the rear axle having two crank portions; two main crank rods articulated between the crank portions of the axle and the first crank portions of the auxiliary crank member; and two auxiliary crank rods articulated between the second crank portions of the auxiliary crank member and the pedal crank; the crank drive mechanism being constructed for causing rotary movement imposed on the pedals by the rider to be converted by the crank member and the axle into rotation of the rear wheels.
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