Seat assembly with movable seat and backrest and method

A vehicular seat assembly comprising:

• a plurality of seats;
• a plurality of backrest assemblies;
• a plurality of seat mounting assemblies mounting the plurality of seats in a near horizontal orientation for movement along respective upwardly concaved arcuate seat paths having at least one center of curvature adjacent a predetermined center of mass zone above a respective seat below a headrest and forward of a respective backrest assembly;
• and
• the plurality of backrest assemblies, each including a backrest member extending in a near vertical orientation proximate a respective seat mounting assembly, each backrest member having an upper backrest member portion thereof mounted to the respective backrest assembly for movement in a vertically extending direction and each backrest member having a lower backrest portion coupled for movement with its respective seat;
• a seat assembly frame for mounting the plurality of seat mounting assemblies and the plurality of backrest assemblies to a vehicle;
• and
• wherein the seat mounting assemblies each include a seat pan having a spherically sliding surface and guide tracks, the guide tracks mated to support surfaces found on seat mounting structures such that the seat mounting assemblies accommodate lateral, diagonal and fore and aft seat motion along said seat path.