Wicked Beernut Home - Halloween Home - Haunt Mechanics
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The following figures are taken from Edwin Wise's "Animatronics: A Guide to Animated Holiday Displays", Prompt Publications, Sams Technical Publishing. Figure 8-3 depicts a four-bar linkage.
In this figure, bars A, B, C and D are referred to as the Ground, Coupler (the bar whose motion we are trying to control), Crank (the driven bar) and Follower, respectively.
Figure 8-6 depicts how the ratios of A:B and C:D affect the coupler's motion.
The 2 Scary Guys Body Slinger is based on these principles.