When lever 1 is turned clockwise about fixed axis A, lever 2, linked to lever 1 by flexible cables 3 and 4, turns in the opposite direction. Lever 2, secured to elevator 5, turns about fixed axis B and is hinged to the stem of valve spool 6. The valve is mounted on power cylinder 7 of the elevator drive. As lever 2 turns, it shifts spool 6 to the left so that fluid under pressure is delivered to the left end of power cylinder 7. Cylinder 7 is linked to lever 2 by pin a, fitting with some clearance in a slot of the lever. The rod of piston 8 is linked to lever 2 through rocker arm 9 and tie-rod 10, which are used so that the pilot can feel the load on the control lever. Cylinder 7 is moved to the left by the fluid, turning the elevator. On the other hand, the pressure of the fluid on piston 8 is transmitted through links 9 and 10 to lever 2 and, consequently, to control lever 1. The force required to turn the control lever is determined from the moment of resistance of the elevator and the ratio of the lengths of the upper and lower arms of lever 9. Fluid from the right end of cylinder 7 drains to the valve and back to the tank. If the motion of lever 1 is stopped at any point, spool 6 of the valve stops and its body, moving along with cylinder 7, blocks off fluid delivery to the left end of cylinder 7. When lever 1 is turned in the opposite direction, the elements of the mechanism operate in the reverse direction.
$3962$LHP,Co$