When control lever 1 is turned counterclockwise about fixed axis A, piston 2, whose rod is linked to lever 1, moves downward, forcing fluid from cylinder 4 into cylinder 5. Piston 6 is raised by the action of the fluid, turning lever 3, linked to the throttle, about fixed axis B. When control lever 1 is turned clockwise, piston 2 moves upward and piston 6 is moved downward by the action of spring 8. At this, lever 3 also turns clockwise. Spring 7 counterbalances spring 8.
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