Ratchet wheel 1 is keyed on low-speed shaft 7 and rotates counterclockwise with it about fixed axis A. Through pawls 2 and flange 3 counterclockwise rotation is transmitted to high-speed shaft 8. Pawls 2 turn on pins in flange 3, and flange 3 and gear 4 are keyed on shaft 8. In this case, shaft 8 rotates at the same speed as shaft 7. Friction plugs (fibre drag-plugs) f are set in holes in lugs b of pawls 2. These plugs are held by springs 6 tightly between pressure disk 5 and ratchet wheel 1. Pressure disk 5 is a sliding fit on shaft 7 and is driven by ratchet wheel 1 through pins a. When high-speed shaft 8 begins to rotate at a higher speed, being driven by gear 4, pawls 2 are disengaged and plugs f drag between disk 5 and wheel 1, causing the pawls to be lifted clear of the ratchet teeth. The pawls remain in this disengaged position until the high-speed drive to gear 4 is disengaged. At this the drag on plugs f is reversed, causing pawls 2 to swing down again and engage the teeth of wheel 1. Stop pins d keep the drag-plugs from swinging too far and becoming entirely disengaged from disk 5 and wheel 1.
$2711$RG,ML$