Patent EA-019942-B1 (EA)
Title: Collapsible bicycle
Inventor: SUZKO VLADIMIR VLADIMIROVICH
IPC: B62K15/00
Filed: 2011-07-13
Abstract: The invention relates to transportation means driven by human's muscular, in particular, to collapsible bicycles. A proposed collapsible bicycle comprises a seat resting on a sliding part of a telescopic seat prop having a fixer of a seat position and connected to a folding back fork of the rear wheel by a hinged unit, kinetically connected with a foot drive, folding pedals are positioned outside a crank, and also a folding back fork having a fixer of developed position and a lock of folded position; a handlebar resting on an extending part of telescopic steering stem rigidly connected in the bottom by its stationary part to the front wheel fork and having a fixer of the handlebar height regulation; a hinged unit and a lock of the developed position of the folding back part of the telescopic steering stem; upper and lower frame tubes, the ends of which are mounded on axes of hinged units positioned on lower stationary part of the telescopic seat prop and the lower part of the telescopic steering stem and also have a limiter of their developed position. A novel feature is characterized in that the hinged unit axis of the folding back part of the steering stem is arranged at an acute angle α to a vertical plane P extending through a longitudinal axis of a bicycle in its developed position sufficient to provide a turn of the folding back part of the steering stem top-down clockwise with simultaneous synchronous handlebar turn by 90° for positioning thereof below parallel to the front wheel and for tight contact of said fold back part to the front wheel fork and their fixation by means of a fixer of the folded position of the fold back fork; a limiter of the developed position of the frame elements is arranged on one of them and axes of hinged units are positioned parallel on stationary parts of the seat prop and the steering stem for upper and lower frame elements at an acute angle β to a vertical plane P extending through a longitudinal axis of a bicycle in its developed position sufficient to provide a turn of the seat prop stem top-down counter clockwise and contacting the upper frame element and for performing bottom-up simultaneous synchronous turn of the front wheel fork in the same direction till positioning the front wheel in a recess in the lower frame element and simultaneous synchronous contact of the frame upper element with the lower element and fixing them by a fixer of the folded position thereof; the foot drive and also a fixer of the developed position and a fixer of the folded position of the fold back fork of the rear wheel are positioned on that fork, and a hinged unit of the fold back fork of the rear wheel is positioned on the lower frame element, wherein the axis of that hinged unit is at an acute angle ν to a vertical plane P extending through a longitudinal axis of a bicycle in its developed position sufficient to provide a turn of the fold back fork of the rear wheel clockwise prior to position it between the backside of bicycle frame elements and earlier folded seat prop with a seat and tight contact of the rear wheel fold back fork and earlier folded front wheel fork and their fixation using a fixer of the folded position.