Composite bicycle frame with crossed tubular portions
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United States of America Patent
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-
May 8, 1990
Grant Date -
N/A
app pub date -
Dec 23, 1987
filing date -
Dec 23, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A generally hollow bicycle frame of resin impregnated fibrous material having a main tubular portion and a cross tubular portion arranged in an X-shaped geometry as viewed from one side. A rear segment of the main portion may be slit to provide opposing rear stays for receiving a rear wheel assembly therebetween. The main tubular portion connects the head tube and the rear wheel supports and the cross tubular portion connects the bottom bracket and the seat sleeve. Both of these portions may be substantially straight and continuous from end to end and joined by a generally hollow common junction. Alternatively, the common junction may integrally unite a plurality of pre-formed tubular portions corresponding respectively to the supports for the front wheel assembly, the rear wheel assembly, the bottom bracket and the seat. The tubular portions may have round or non-circular aerodynamic cross-sectional shapes.
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