Link 1 turns about fixed axis F and is connected by a sliding pair to slider 3. Slider 3 is connected by turning pair B to slider 4 which moves along fixed guides t-t whose axis is perpendicular to axis 0x. Link 2 turns about fixed axis 0 and is connected by a sliding pair to cross-shaped slider 6 which has guides perpendicular to each other. Slider 6 moves along cross-piece Bf of slider 3. The axis of cross-piece Bf is perpendicular to axis Fd of link 1. When link 1 turns about axis F, point D of slider 6 describes ophiuride s-s with the equation x(x²+y²)=y(mx-ay) where a and m are constant dimensions of the mechanism.
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