Heavy link 2 turns about axis A of disk 1. Link 4 is connected by turning pairs B and C to links 2 and 5. Link 5 is designed as a gear turning about axis D of disk 1. Gear 5 meshes with gear 3 which rotates about fixed axis E. When the speed of disk 1 changes, link 2 is forced outward by centrifugal force or inward by spring 6 about axis A. Through link 4 and gear 5, link 2 turns gear 3 with respect to disk 1. Spring 6 is attached with one end to link 2 and the other to disk 1.
$1761$GL,G$