The lengths of the links comply with the conditions: 0͞A=A͞P and 0͞B=0͞C²/(20͞A). Link 2 turns about fixed axis A and is connected by turning pair P to cross-shaped slider 5 which has guides perpendicular to each other. Link 4 turns about fixed axis 0 and is connected by sliding pairs to sliders 5 and 3. Link 1 has the form of a bent lever and turns about axis 0. Link 1 is connected by turning pair C to link 6 and its arm Ca moves in slider 7. Link 6 is connected by a sliding pair to slider 5. Sliders 3 and 7 are connected together by turning pair Q. The mechanism complies with the inversion condition, i.e. 0͞Px0͞Q=P͞C². When link 2 turns about axis A, point P of slider 5 describes circle p-p, and point Q of slider 3 describes straight line q-q which is perpendicular to the line of centres 0ABd and passes through point B.
$1363$LG,GI$