The invention relates to a bicycle frame, in particular to a bicycle frame stable in structure and small in a bicycle body. The bicycle frame comprises a front-fork socket, a saddle casing, a middle-axle casing and a rear-axle fork frame, the front-fork socket and the saddle casing are connected through a top bar, the middle-axle casing and the front-fork socket are connected through a bottom bar, the saddle casing and the middle-axle casing are connected through a vertical beam, and one end of the rear-axle fork frame is used for mounting of a rear axle while the other end is fixedly connected with the middle-axle casing. Strength of the bicycle body is effectively improved through a tri-prism tubular structure, a triangular prism close to top bar and bottom bar sides is of a tri-prism edge surface of the vertical beam, a triangular prism close to the rear-axle fork frame is a tri-prism edge of the vertical beam, a circular-arc concave surface is arranged on the middle lower side of the vertical beam, a wheel protrudes into the circular-arc concave surface, the length of the bicycle body is effectively shortened, and the bicycle body is lighter.
Bicycle frame stable in structure and small in bicycle body
01.07.2015
Patent
Elektronische Ressource
Englisch
IPC: | B62K Fahrräder , CYCLES |