Stadium riser individual seat, support and armrest with common seat-row backrest

In step riser mounted seating:

• a plurality of rowed individual seat means including, first structural members adapted to be mounted, in space-separated paralleled relationship, to the upright face of a step riser at each side of a seat;
• individual seat bottom means adapted for being mounted between and by pairs of successive adjacent ones of said first structural members;
• said first structural members being extended transversely above and below said individual seat bottom means mounted thereby;
• with the upper longitudinally extending portions of said structural members formed over by substantially ninety degrees, so as to coextend with, and be substantially parallel to, said seat bottom means, to provide armrest sections above and to each side of said individual seat bottom means;
• each of said first structural members being a continuous expanse of U-shaped channel, with the exterior surface of the channel web adapted to be juxtaposed with, and mounted to, the upright vertical face of a step riser;
• with such channel web exterior surface presenting upward facing armrest surfacing;
• a plurality of seat back support structural members, individual ones of which are affixed to and extended upwardly from the transversely extended portions of predetermined ones of said first structural members;
• and, a continuously extending seat backrest member extending transversely of and affixed to each of said back support structural members.