| 主权项 |
1. A foldable bicycle having a frame structure comprising:
a front member having a front wheel and a handlebar column affixed thereon; a rear member having a rear wheel affixed thereon; a third member supporting a seat post, a seat, and a connection rod connected to said rear member and front member to form a four-member kinematic chain; a lower joint connecting said connection rod to said front member, and an upper joint connecting said connection rod to said third member, said lower and upper joints configured as ball joints; and a central joint connecting the front and rear members and enabling a pivoting movement of said members with respect to each other between a folded-out state, in which the bicycle is usable as a means of transport, and a folded-up state, in which the bicycle is adapted to be stored and transported, wherein an axis (A) of said central joint deviates by an angle (a) from a direction (x-x) perpendicular to a longitudinal and vertical central plane (y-y) so as to enable a pivoting downward movement of the front member from its folded-out state towards its folded-up state, and wherein in the folded-up state, the front wheel assumes a position in which it is laterally displaced with respect to the rear wheel and overlaps with the rear wheel in a side view and the axes (C, D) of the rear wheel and the front wheel are on a common line. |
