Vehicle adjustable and stowable rear seat

A seat for a motor vehicle body comprising:

• a generally horizontal seat cushion and upright seatback supported on a longitudinally adjustable bi-level seat support frame;
• said seat frame comprising a front lower portion slidably mounted on front track assemblies and a rear elevated portion slidably mounted on rear track assemblies at an elevation a predetermined vertical dimension above said front track assemblies;
• a bi-level frame adjustment latching device for latching said seat frame to one of said front and rear track assemblies;
• a pair of forward upright links each having a lower end pivotally mounted to the seat from front portion for rotation about a first transverse axis with respect to said seat frame front portion and an upper end pivotally mounted to a front portion of said seat cushion for rotation about a second transverse axis with respect to a front portion of said seat cushion, a pair of upstanding laterally spaced arms each having a proximate end fixed to an aft end of said seat cushion and a distal end pivoted to an intermediate portion of said seatback for rotation about a third transverse axis;
• a pair of upstanding seatback pivot mounts fixed on said seat frame elevated portion, each said pivot mount having an upper end pivoted to a lower portion of said seatback for seatback rotation about a fourth transverse axis, wherein said third and fourth axes define a plane common to said seatback;
• a seatback pivot latching device for latching said seatback against pivotal movement;
• whereby with the bi-level seat frame adjustment latching device in a locked mode and the seatback pivot latching device in an unlocked mode said seatback is adapted to be pivoted forward about said fourth axes to a fold-flat stowed position resulting in conjoint parallelogram movement of said seat cushion about said first, second, third, and fourth axes between an elevated in-use position, to a forward and lowered stowed horizontal position, wherein said seatback overlies said stowed seat cushion and said bi-level frame rear elevated portion.