| 摘要 |
A bicycle frame formed as a unitary plastic molding is, in outline, a forwardly-upwardly sloping parallelogrammatic structure having a diagonal seat post connected between the middle diagonal corners. The top and front struts are formed of a semicylindrical portion and a radial rib portion protruding perpendicularly from the face opposite the semicylindrical face of the semicylindrical portion; the back and bottom braces are formed of a semicylindrical portion and a bar portion extending beyond the flat face of the semicylindrical portion and in the plane thereof. The entire frame is molded in one piece with a hard exterior skin covering a structural foam interior.
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