| 摘要 |
A unitary molded or cast bicycle frame formed by a plurality of elements of open cross-section and integral with each other to form a unitary structure, such elements including a top crossbar, a steering tube at one end, the front end, of the crossbar, a transverse crank gear case below and spaced downwardly from the top crossbar, a bottom member extending from the steering tube to the crank gear case, a two-armed, wheel receiving fork extending rearwardly from the crank gear case and having wheel spindle receiving openings at the rearward ends of the arms, a pair of struts extending from the arms of said fork adjacent said openings to the opposite, rear end of the top crossbar and a strut member extending from said struts at portions thereof intermediate said top crossbar and said openings to the arms of said fork adjacent said crank gear case. A saddle or seat tube or opening is provided at or adjacent the juncture of the struts and the top crossbar.
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