D. Linkage Mechanisms
Linkage mechanisms are composed by links in which
all joints belong to the surface-contact kinematic pairs, e.g., the revolute
pairs, prismatic pairs, spherical pairs, or screw pairs, etc. The major functions
of linkage mechanisms include the changes of types and directions of motions,
function generation, path generation, and rigid-body guidance. So there are
many applications of linkage mechanisms in engineering.