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EVANS-DE JONGE FOUR-BAR APPROXIMATE STRAIGHT-LINE MECHANISM

The lengths of the links of four-bar linkage ABCD comply with the conditions: A͞D=3.1A͞B, B͞C=1.55A͞B, D͞C=B͞E=l.9A͞B, C͞E=3.45A͞B and A͞F=1.09A͞B. When link 1 turns about fixed axis A, point E of link 2 describes a path of which a certain portion approximates straight line q-q passing through point F on the extension of straight line DA.
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