Piston rod 10 of pneumatic cylinder k has stroke s. Displaced together with rod 10 is pulley block 9 in which three pulleys, 1, 2 and 3 are mounted. Pulleys 1, 2 and 3 rotate about axes A, B and C of block 9. Pulleys 1', 2' and 3', of the same size as 1, 2 and 3, rotate about fixed axes A', B' and C'. Flexible link 6 has one end attached to the base at point D, and runs consecutively over pulleys 3, 3', 2, 2', 1 and 1', and over pulley 7 which rotates about fixed axis N. The other end of link 6 is attached at point F to plat form 8 of the catapult which travels along fixed guides b-b. When piston rod 10 travels a distance to the left equal to s, plat form 8 travels a distance to the right equal to S=6s.
$3584$CFL,FD$