Lever 1 turns about fixed axis D and is connected by turning pair E to slider 2 which moves along the slot in link 3. Link 3 is connected by turning pair F to lever 4 which turns about fixed axis B. When lever 1 is turned clockwise, slider 2 moves along slotted link 3, turning it with respect to centre F until lever 1 reaches its extreme right-hand position. After this, link 4, actuated by spring 5, is flipped about axis B to its position against stop C. When lever 1 is turned counterclockwise link 4 is flipped to its position against stop A.
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