Richard O Trimble

US Patent:

49232037, May 8, 1990

Filed:

Dec 23, 1987

Appl. No.:

7/137124

Inventors:

Brent J. Trimble - Anchorage AK
Richard H. Trimble - Providence RI

International Classification:

B62K 314

US Classification:

2802883

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.