Heavy weights 2 can move in a straight line along guides a-a. Links 3, in the form of bent levers, have spherical surfaces A and C at their ends. When there is a change in the rotational speed of shaft 1, weights 2, moved by centrifugal force in the radial direction, shift link 4 along the axis of shaft 1 by means of levers 3 which turn about axes B. In their outward motion, weights 2 overcome the resistance of springs 5.
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