Patent ID: 6196566
Filing Date: 2001-03-06
Classification: B62K

Abstract:
A lightweight folding bicycle, in which a frame connects front and back wheels through a driving system, a handlebar is fixed on a front of a crossbar (5) by a handlebar stem (31), the driving system links with a pedal (10) through a crank (8), a saddle is fitted on a top end of a seat tube (1) and a bottom end of the seat tube hinge joints with a tail end of the crossbar (5) while this tail end joints left and right hinge points of a back fork (6), opposite ends of the back fork (6) joints a cross fork (7) and opposite ends of the cross fork (7) joints an end of two standing tubes (3) at the same point as one end of a down tube (4), opposite ends of the two standing tubes (3) joint in a middle of the seat tube (1) and opposite ends of the down tube (4) hinges in a middle of the crossbar (5); wherein a diagonal-bar-hinge (2) is added and made up of two parts which are hinged together at opposing ends, an upper end of the diagonal-bar-hinge (2) joints in the middle of the seat tube (1) at the same point as the standing tube (3) hinged and a lower end of the diagonal-bar-hinge (2) joints in the middle of the crossbar (5) at the same point as the down tube (4), the diagonal-bar-hinge (2) has a spacing structure.