The lengths of the links comply with the condition: A͞B=b. Link 2, turning about fixed axis 0, moves in sliders 3 and 4. Slider 4 is connected by turning pair C to slider 5 which moves along fixed guides p-p. Link 1, turning about fixed axis A, is connected by a sliding pair to slider 6 and by turning pair B to slider 7 which moves along extension q of slider 5. Sliders 3 and 6 are connected together by turning pair K. When sliding link 1 turns about axis A, point K describes a portion of a parabola with the equation y2+2ax-a²=0 where a=0͞A.
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