  We amalgamate two fundamental designs from distinct areas of wave control in
physics, and place them in the setting of elasticity. Graded elastic
metasurfaces, so-called metawedges, are combined with the now classical
Su-Schrieffer-Heeger (SSH) model from the field of topological insulators. The
resulting structures form one-dimensional graded-SSH-metawedges that support
multiple, simultaneous, topologically protected edge states. These robust,
enhanced localised modes are leveraged for applications in elastic energy
harvesting using the piezoelectric effect. The designs we develop are first
motivated by applying the SSH model to mass-loaded Kirchhoff-Love thin elastic
plates. We then extend these ideas to using graded resonant rods, and create
SSH models, coupled to elastic beams and full elastic half-spaces.
