Phillips’ 2000 patent illustrates three, two-link
mechanisms eccentrically mounted on a shaft and
enclosed within a stator housing as shown in Figure 15.
Each arm consists of a freely revolving link rotating
about a common pin eccentrically located on the shaft.
A second link is pinned at the end of the first link, freely
revolving about this joint. A volume change occurs
between two adjacent arms and the stator housing. The
eccentric location of the shaft pin provides the means for
the volume change