Composite bicycle frame and method of manufacturing

Land vehicles – Wheeled – Occupant propelled type

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264258, 264314, B62D 304

Patent

active

058034765

ABSTRACT:
A bicycle frame has a seat tube fitting to which a seat is attachable, a head tube fitting to which forks are attachable, and a bottom bracket fitting to which a crank shaft is attachable. A single frame tube of fiber reinforced polymer composite interconnects the seat tube fitting, head tube fitting, and bottom bracket fitting in a manner which provides a lightweight, and durable bicycle frame. The single frame tube is formed by disposing the seat tube fitting, head tube fitting, and bottom bracket fitting within a first mold section, then disposing a bladder covered with polymer impregnated fiber within the first mold section such that the bladder passes through openings in the seat tube fitting, head tube fitting, and bottom bracket fitting. The bladder is then inflated while the polymer impregnated fiber is heated so as to form a fiber reinforced polymer composite which conforms to the shape of the cavity formed within the mold, thereby defining the desired bicycle frame.

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