Drum a is rigidly attached to gear 1 which meshes with planet gears 2 and 6 of equal pitch diameter. Rigidly attached to gears 2 and 6 are planet gears 5 and 3 of equal pitch diameter. Studs d and f, about which planet gears 6 and 3, and 2 and 5 rotate, are rigidly attached to drum b. Driven gear 4 is keyed to shaft c and meshes with planet gears 3 and 5. When a brake is applied to drum b, studs d and f are stationary. When shaft c is subject to an overload, drum b begins to slip, and gears 2, 5, 6 and 3 roll around sun gears 1 and 4.
$2968$CxG,B$