Patent ID: 7407620

Claim:
A method for making bicycle frames, comprising the steps of: providing two first movable mold parts on a base board and each first movable mold part having concavities; providing a seat tube and a head tube into the concavities of the first movable mold parts; providing a top tube and a down tube via wrapping carbon-fiber sheets; connecting the top tube and the down tube between the seat tube and the head tube; wrapping carbon-fiber sheets on the seat tube to form two connection ends; mounting two second movable mold parts on the first movable mold parts and the second movable mold parts having concavities corresponding to the concavities in the first movable mold parts so that two ends of the seat tube and two ends of the head tube are located in the first and second movable mold parts; and blowing air into the top tube, down tube and the two connection ends to inflate the carbon-fiber sheets to contact against inner peripheries of the concavities under high temperature and pressure, the carbon-fiber sheets being solidified.