Link 1 has two circular guides a. Link 2 is designed as two sliders fitting in guides a and turning about the axis of pin d. When bracket 4 is put into various positions by turning it about fixed axis A and clamping it, rotation can be transmitted from link 1 to link 3 under the condition that the axes of all the turning pairs and of the circular guides intersect at a single point. The mechanism transmits rotation from shaft 1 to shaft 3 at various angles of intersection of their axes at a constant point .
$968$LG,4L$