| 摘要 |
The invention concerns a bicycle frame comprising a rear fork, an upper beam, a lower beam and saddle supporting element (17). The invention is characterised in that a front portion (27) of the frame consists of a structural bar with closed outline comprising two identical tubular lateral sections (2, 3) and a lower tubular section (4), each section (2, 3, 4) having an outer wall (21, 31, 41) defining at least partially said structural bar outline and an inner wall (22, 32, 42) partially defining an intervening recess (5) extending radially up to said structural section outline forming linking zones (6, 7, 8) between the sections (2, 3, 4) and in a portion located at rear of the front portion (27), said structural bar is split into three divergent tubes (9, 10, 11) each extending one of the three sections (2, 3, 4), the lower beam being constituted by the tube (9) located in the lower tubular section (4) extension, and the rear fork integral with the upper beam being constituted by the two tubes (10, 11) located in the extension of the two identical tubular sections (2, 3) between which is arranged the saddle supporting element (17). |
