Wobble plate 2 is connected by a turning pair to shaft 1 and is enclosed by ring 5 which has pins A and A' sliding in fixed guides of the housing. Tie-rods 3 and 3' are connected by turning pairs to wobble plate2 and to sleeves 4 and 4'. The sleeves rotate together with shaft 1, being mounted on keys. A spring is mounted on shaft 1 between the sleeves. When shaft 1 rotates, wobble plate 2 rotates in ring 5 which oscillates with respect to point 0. At points B and B' ring 5 is connected by spherical pairs to tic-rods 6 and 6' which, in turn, are connected to a ratchet device and drive its shaft. As long as the forces of resistance exerted by tie-rods 6 and 6' are counterbalanced by the tension of the spring between sleeves 4 and 4', the angle made by ring 5 and wobble plate 2 with shaft 1 remains constant. When the load increases on the shaft of the ratchet device, the spring between sleeves 4 and 4' is compressed, increasing the angle between the plane of plate 2 and shaft 1 and thereby automatically reducing the transmission ratio between shaft 1 and the shaft of the ratchet device.
$1593$SC,WP$