| 摘要 |
PURPOSE: A foldable electric four-wheel bicycle is provided to adjust the height of a bicycle body by rapidly separating a saddle post of three-stage separation structure with simple manipulation. CONSTITUTION: A foldable electric four-wheel bicycle(100) comprises a center frame(110), a steering shaft(140), and a saddle post(160). The rear end of a front center frame(111) of the center frame is inserted into the inner diameter of a rear center frame and slides forward and backward to adjust the full length of a bicycle. A steering shaft folding unit(150) connects upper and low steering shafts of the steering shaft. The upper steering shaft is turned and folded rearward of the bicycle by the steering shaft folding unit. The saddle post is comprised of first, second and third stage saddle posts(161,162,163). The insertion depth of each stage post is controlled to adjust the height of the saddle post. The inserted saddle post is released to separate the saddle post. |
