Link 1, rotating about fixed axis A, has arc-shaped recesses a with a radius of curvature equal to the radius of disk 2 which rotates about fixed axis B. Link 1 is locked against rotation when disk 2 enters a recess a. Tooth space b in disk 2 allows projections c of link 1 to pass under disk 2 and link 1 to turn through one recess.
$262$SL,SD$