Hand lever fixture for handlebar-controlled vehicles, in particular motorcycles

Hand lever fixture for handlebar-controlled vehicles, in particular motorcycles, the fixture comprising a support body which can be attached to a handlebar, on which support body a hand lever and an over-center spring are pivotably mounted, said hand lever being effectively connected to a master cylinder in order to generate an actuating pressure, wherein the over-center spring is effectively connected to the hand lever in such a way that, when the hand lever is in a position between a dead center position and an end position, the over-center spring generates a lever moment on the hand lever, said lever moment acting in the direction of this end position, wherein the hand lever is split into two, comprising a main lever which can be acted upon manually with an actuating force and a second, auxiliary two-ended lever which is pivotably mounted between its ends at a first bearing point on the support body, at the first end of which auxiliary lever the over-center spring is articulated while an auxiliary force resulting from the lever moment generated by the over-center spring can be transmitted to the master cylinder via its second end, and wherein the main lever is pivotably mounted on the auxiliary lever at a second bearing point and an adjustment device is arranged between the main lever and the auxiliary lever, by means of which adjustment device the relative angular position of main lever and auxiliary lever with respect to the second bearing point can be adjusted.