A handlebar joint, comprises a disc seat, a rotating disc and a clutch disposed between both of them and having flexible element that passes through a handlebar. In a normal coupling position, the two end of the clutch is coupled to the disc seat and the rotating disc so as to keep the handlebar relatively...http://www.google.sh/patents/US6503018?utm_source=gb-gplus-sharePatent US6503018 - Structure of handlebar joint
