148 Layouts of spatial motion structures
synchronise their motions three pairs of bars, shown in dash line in Figure
7.11(c), are added so that there are a total of six Myard linkages around
point A to form an umbrella frame. Now the entire assembly has mobility
one. This construction process can be repeated to form a large motion
structure.
(a)
(b)
(c)
Figure 7.11 Assembly of Myard linkage with α 12 = π /6. (a) An assembly of six
such linkages and (b) a unit and (c) assembly with three units.