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 8-24 depicts an accordion linkage.
The accordion linkage requires a sliding joint at the base and at the opposite end. Figure 8-25 depicts Edwin's proposed design for the sliding joint.