Crank 1 rotates about fixed axis A of platform 4 which is mounted on flat springs 3. Connecting rod 7 drives platform 5 which is mounted on long flat springs 6. Flat springs 2 which are to be tested are secured with one end in the fixed foundation and the other end in a grip a of platform 5. When crank 1 rotates, springs 2 have an elastic oscillating motion.
$2140$EL,M$