Plunger 2, transmitting motion and the load to upper grip 3, is actuated by fluid delivered by an installation which is not shown. The device for applying a variable load consists of two slider-crank mechanisms with common crank 1, rotating about fixed axis A, and connecting rods 8 and 9, connected by turning pairs B to crank 1 and by turning pairs E and D to pistons 10 and 11. Pistons 10 and 11 reciprocate in cylinders 4 and 5. When crank 1 rotates, fluid is delivered alternately from cylinders 4 and 5 into cylinder 6, thereby applying a variable load to test piece 7.
$3942$LHP,M$