Link 1 has the form of a bent lever with the angle fAd equal to 90°. Link 1 turns about fixed axis A. Arm Ad of link 1 moves in slider 3 which, in turn, is connected by turning pair B to link 4. Link 4 turns about fixed axis 0. Sliders 2 and 5 are connected together by turning pair D, and move along axis Af of link 1 and axis Bm of link 4. When link 1 turns about axis A, point D of slider 2 describes a curve of Gerabec with the equation ρD=0͞D=a((a+b*cos(ϕ))/(b+a*cos(ϕ))) or a²(x-a)²(x²+y²)=b²(ax-x²-y²)² where a and b=0͞B are constant dimensions of the mechanism, ϕ = polar angle between vector ρD and polar axis 0x.
$1213$LG,Ge$