Folding bicycle, folding mechanism for folding bicycle and dual arm type crank

摘要

The invention relates to a folding bicycle, and a folding mechanism and double-arm crank used for the folding bicycle. Although a currently-known folding bicycle can be folded, the bicycle cannot be carried conveniently due to the size of the bicycle. The currently-known folding bicycle has problems that parts of pedals, handlebars, vehicle wheels or a chain are exposed and can pollute or scratch surrounding objects. The folding bicycle includes front and rear wheel folding mechanisms and a double-arm crank. A four-bar linkage arranged on a front frame and a folding mechanism arranged on a rear frame respectively fold the accommodating space between the front wheel and the corresponding frame and the accommodating space between the rear wheel and the corresponding frame longitudinally, the front and rear frames are folded transversely by taking a hinge joint as a pivot, by means of the folding of the above mechanisms, the folding bicycle forms an approximately-rectangular luggage, parts which can be exposed before are all hidden in the luggage in order to reduce the size of the folding bicycle, finally supplemented by handlebars of the folding bicycle and an auxiliary wheel used for dragging, the folding bicycle can be carried out conveniently.