Disks 1 and 2 rotate about fixed axes A and B and have identical ratchet-type teeth a on their mating faces. Rotation can be transmitted from shaft 3 to shaft 4 only in the direction shown by the arrows. If the direction of the driving disk 1 is reversed, it w ill slide over stationary disk 2. Spring 5 tends to hold the disks in engagement.
$2672$RG,3L$