The Bricard linkages 127
A reproduction of the first linkage is shown in Figure 6.14. For convenience, let us call it Linkage I. The other, Linkage II, is shown in Figure
6.15. The geometric parameters of the original threefold- symmetric Bricard
linkage and its alternative form of both linkages are as follows (Chen et
al., 2005).
(a)
(b)
Figure 6.14 Motion sequence of Linkage I. (a) Fully expanded configuration and
(b) blockage occurs during folding.
(a)
(b)
(c)
(d)
Figure 6.15 Motion sequence of Linkage II. (a) Fully expanded, (b) to (c) intermediate and (d) fully folded configurations.