Shaft 1, whose speed is to be governed, rotates about vertical axis y-y. Rigidly secured to shaft 1 is bar 3 along whose axis x-x weights 2 slide. Pawls 4 turn about axes A and B of bar 3. When the rotational speed of shaft 1 increases, weights 2, moved outward by centrifugal force, press against pawls 4 which turn about axes A and B, overcoming the tension of spring 6, so that their upper ends are forced against brake disk 5.
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