Piston 1 is moved to the left by the action of fluid delivered to the right end of cylinder 2. This motion is transmitted to slider 6 through flexible steel belt 3. Belt 3 runs over pulley 9, rotating about fixed axis B, and pulley 4, rotating about axis A, which slides along slot a of the upright and is subject to the action of spring 7. Axle A is connected by flexible link 5 to slider 6 which moves to the right, overcoming the resistance of spring 8.
$4123$EHP,Dr$