Patent ID: 7140629

Claim:
A foldable bicycle comprising: a frame unit including a front frame rod, a rear frame rod disposed behind said front frame rod, a front wheel unit disposed at a front end of said front frame rod, a rear wheel unit disposed at a rear end of said rear frame rod and aligned with said front wheel unit along a longitudinal direction of said bicycle, and a horizontal pivot pin interconnecting rotatably a rear end of said front frame rod and a front end of said rear frame rod such that said pivot pin and rotating axes of said front and rear wheel units forming generally an isosceles triangle, said front and rear frame rods extend along an inclined axis, said front frame rod having a rear end surface that is disposed above said pivot pin and that is inclined relative to said inclined axis, said rear frame rod having a front end surface formed with a groove that is disposed above said pivot pin, that is inclined relative to said inclined axis, and that abuts against said rear end surface of said front frame rod, said rear end surface of said front frame rod being formed with an integral tongue that extends into said groove in said front end surface of said rear frame rod, said pivot pin extending through said front end of said rear frame rod and said tongue of said front frame rod and having a central axis that is inclined relative to said inclined axis so as to allow for alignment of said front and rear wheel units along said transverse direction of said bicycle when said bicycle is folded, a line interconnecting said rotating axes of said front and rear wheel units constituting a base of said isosceles triangle; and a positioning unit positioning said rear frame rod behind said front frame rod and operable to allow for rotation of said front and rear frame rods about said pivot pin so as to dispose said bicycle at a folded position, where said front and rear wheel units are aligned with each other along a transverse direction of said bicycle said positioning unit being operable to turn said rear end surface of said front frame rod and said front end surface of said rear frame rod downwardly so as to fold said bicycle.