Foldable bicycle

A foldable bicycle comprising a frame made up of a rear portion supporting a rear wheel about a rear axis of rotation, of a front portion supporting a front wheel about a front axis of rotation, and of a hinge system arranged between the rear portion and the front portion so as to position the bicycle either in an unfolded position in which the front portion extends forwards and in alignment with the rear portion, or in a folded position in which the front portion is folded back against the rear portion, wherein the hinge system comprises a first part arranged on the rear portion and provided with a first plane surface, a second part arranged on the front portion and provided with a second plane surface that is in abutment in direct or indirect manner against the first plane surface, a pivot coupling arranged between the first part and the second part about a pivot axis that extends perpendicularly to said first and second plane surfaces, at least one stud, slide means arranged between the stud and one of the first and second parts so as to slide the stud either into a projecting position in which it projects from the first or the second plane surface or into a refracted position in which it is retracted inside said first or second parts, actuator means for actuating said at least one stud, which means are configured to slide said stud either into the projecting position or into the retracted position, and at least one orifice configured on the other of the first and second parts to open out in the first or the second plane surface and to receive said at least one stud in its projecting position at least when the bicycle is in its unfolded position, wherein the second part is provided with two orifices opening out in the second plane surface for the purpose of receiving a stud in the projecting position, the first orifice being configured to receive the stud when the bicycle is in the unfolded position, and the second orifice being configured to receive said stud when the bicycle is in the folded position.

A foldable bicycle comprising a frame made up of a rear portion supporting a rear wheel about a rear axis of rotation, of a front portion supporting a front wheel about a front axis of rotation, and of a hinge system arranged between the rear portion and the front portion so as to position the bicycle either in an unfolded position in which the front portion extends forwards and in alignment with the rear portion, or in a folded position in which the front portion is folded back against the rear portion, wherein the hinge system comprises a first part arranged on the rear portion and provided with a first plane surface, a second part arranged on the front portion and provided with a second plane surface that is in abutment in direct or indirect manner against the first plane surface, a pivot coupling arranged between the first part and the second part about a pivot axis that extends perpendicularly to said first and second plane surfaces, at least one stud, slide means arranged between the stud and one of the first and second parts so as to slide the stud either into a projecting position in which it projects from the first or the second plane surface or into a refracted position in which it is retracted inside said first or second parts, actuator means for actuating said at least one stud, which means are configured to slide said stud either into the projecting position or into the retracted position, and at least one orifice configured on the other of the first and second parts to open out in the first or the second plane surface and to receive said at least one stud in its projecting position at least when the bicycle is in its unfolded position, wherein, in its first plane surface, the first part is provided with a circular groove in which a spring is arranged that has a first end secured to said first part and a second end secured to the second part, said spring being configured to cause the front portion to pivot automatically relative to the rear portion so as to bring the at least one stud out of alignment with the at least one orifice when said stud is in the retracted position.