When bent sliding link 1 slides in guides 2 and 3, which turn about fixed axes A and B , point K of the link describes a cardioid with the equation ρK=b-2a*sin(α+ϕ)/sin(α) where a=A͞B/2, b=C͞K, ρ=B͞K, ϕ=polar angle, α= angle ACB of bent sliding lever 1. If α=π/2 and a=b, then the equation of the cardioid is ρ=2a(1-cos(ϕ).
$1143$LG,Ge$