The invention provides a central axle adjustable bicycle frame which includes a front vertical tube, a cross beam, a seat mounting tube, a central axle sleeve, a middle vertical beam, a seat stay and a chain stay, wherein the seat stay and the chain stay are fixedly connected onto the middle vertical beam. The tail ends of the seat stay and the chain stay are fixedly connected at the position where a back wheel axle is installed. The middle vertical beam is of an arc structure, and an arc groove and a cover used for opening and closing the arc groove are arranged on the middle vertical beam. The center of circle of the arc groove is located on the axis of the back wheel axle. A plurality of teeth are transversely arranged on the bottom surface of the arc groove. The cover is arc, and the radian of the cover is as same as that of the arc groove. A plurality of teeth are arranged on the side surface of the cover opposite to the arc groove, the cover is fixed on the groove through a connector, and the central axle sleeve can move along the arc groove. A plurality of teeth are arranged in the outside peripheral direction of the central axle sleeve, and the teeth on the central ale sleeve are meshed with the teeth on the arc groove and the cover respectively. The central axle adjustable bicycle frame is simple in structure, convenient to operate and comfortable to use.
Central axle sleeve adjustable bicycle frame
2015-04-29
Patent
Electronic Resource
English
IPC: | B62K Fahrräder , CYCLES |