![]() Internal frame 28 parallels portions of the perimeter tube 26, reinforcing the sides of the perimeter tube and adding a seat back bottom brace 34 and a cross member 32 to give the frame 20 rigidity. Excluding the risers 22, 24, virtually none of the components are reusable should seat specifications, such as width, or height of the seat back be changed. ![]() An internal frame 28 and a back seat support 30 are nestled within the closed perimeter tube 26. Wall riser 24 is constructed by welding together at least two plates. The full perimeter tube 26 is supported by an aisle riser 22 and a wall riser 24. A closed loop, multi-piece full perimeter tube 26 outlines the seating area. 2 illustrates a seat frame 20 according to the prior art.
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