Patent ID: 8814194

Claim:
A folding type bicycle comprising: a front frame provided with a front wheel and a handle; a center frame provided with pedals and a saddle; a rear frame provided with a rear wheel; a hinge device to enable the front frame, the center frame and the rear frame to pivot about one another, to be foldable with respect to one another, the hinge device comprising a front hinge member provided at the front frame, a center hinge member provided at the center frame, and a rear hinge member provided at the rear frame; a hinge shaft centrally provided at the hinge device; a front rim provided at the front hinge member, a center rim provided at the center hinge member and a rear rim provided at the rear hinge member; and a plurality of rolling members fitted in fitting holes in the center hinge member to enable rolling-contact among the front, center and rear rims.