Equal weights 3 turn about axes A and B of arm 2 which is keyed to the driving shaft. Drum 1 of the clutch is keyed to the driven shaft. With an increase of the speed of the driving shaft, weights 3 are pressed by centrifugal force, overcoming the resistance of springs 4, against the inside surface of drum 1, thereby engaging the clutch. Levers 5, which limit the outward motion of the weights, are pivoted to the weights and to collar 6, rotating freely on the shaft.
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