Gear 1 is keyed to shaft a and meshes with planet gears 2. Planet gears 3 are rigidly attached to gears 2 and mesh with fixed sun gear 4. Toothed clutch member 6 with internal teeth is keyed to shaft a. Clutch member 8, also with internal teeth, belongs to carrier 7 which rotates freely on shaft a and carries planet gears 2 and 3. Clutch member 5 has external teeth and slides along a key on shaft b so that it can be shifted into engagement with either clutch member 6 or 8. When shaft a rotates, shaft b can rotate in either the forward or reverse direction depending upon which clutch member, 6 or 8, member 5 is engaged with. In the position shown, rotation is transmitted from shaft a through gear 1 to planet gears 2 and 3. Gear 3 rolls around fixed sun gear 4, rotating carrier 7, and, through clutch members 8 and 5, shaft b. When member 5 is shifted to engage member 6, rotation is transmitted directly from shaft a to shaft b which, of course, then rotates at the same speed and in the same direction as shaft a.
$2890$CxG,PR$