Lever 1 turns about fixed axis A. Connecting rod 2 is connected by turning pair B to link 3 which has wedge-shaped recesses b containing rolls a. Ring 4 rotates freely about fixed axis C. When lever 1 is oscillated about axis A, link 2 oscillates link 3 about axis C. By means of rolls a which become jammed in recesses b link 3 turns ring 4 intermittently counterclockwise. Spring 5 holds the rolls in contact with link 3 and ring 4.
$1799$LR,4L$