Drop down stow in floor automotive vehicle seat assembly

A seat assembly for supporting an occupant above a floor having a load floor, a recess below the load floor and an intermediate structure extending therebetween, said seat assembly comprising:

• a seat cushion extending between a seating surface and a bottom surface;
• a seat back pivotally coupled to said seat cushion for movement between a support position and a forwardly stowed position overlying said seat cushion;
• a riser mechanism extending between said bottom surface of said seat cushion and the floor for allowing selective movement of said seat assembly between a seating position to support the occupant above the floor and a stowed position disposed within the recess in the floor, said riser mechanism operatively coupled to said seat back and including front and rear links each pivotally coupled to said seat cushion and the floor for allowing selective movement of said seat assembly between said seating and stowed positions, each of said front and rear links including an upper arm pivotally coupled to said seat cushion and a lower arm extending perpendicularly to said upper arm for attachment to the floor;
• a pivot pin extending longitudinally between a proximal end fixedly secured to one of said front and rear links and a distal end, said pivot pin rotatably journaled to said seat cushion between said proximal and distal ends;
• a radial arm extending radially outwardly from said distal end of said pivot pin;
• and
• a radial link extending between said seat back and said radial arm for pivoting said pivot pin in response to movement of said seat back between said support and forwardly stowed positions, respectively, to cause movement of said seat assembly between said seating and stowed positions.