Mécanismes à barres trajectoires et conception.pdf

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Invert the motion and solve the problem graphically. Draw a line from O2 to B2 and rotate it
clockwise 120˚ to locate the position of B'2 . Draw the perpendicular bisector of B'2 B1 and locate
the intersection of that line with the line O2 A1 . This will locate A1 . The solution is given in the first
figure below. Measure the lengths os 02 A1 and A1 B1 . After unscaling, the linkage is shown in the
second figure that follows.
The link lengths are:
r1 = 13"
r2 = 8.27"
r3 = 19.34"
r4 = 12"

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