School bus seat frame back attachment

Abstract

A modified seat frame provides a seat back and lower frame on which the seat back may be mounted. The lower frame includes risers with support necks for receiving the seat frame.

1 . A modular seat frame comprising:
 a lower frame sub-assembly including a first riser having a first open support neck and a second riser having a second open support neck;   a seat back sub-assembly including an upside-down U shaped partial perimeter tube supported by the first riser and the second riser at joints formed between opposed ends of the upside-down U shaped partial perimeter tube and the first open support neck and the second open support neck; and   the opposed ends of the upside-down U shaped partial perimeter tube conforming to interior shape of the first neck and the second neck.   
   
   
       2 . The modular seat frame as claimed in  claim 1  wherein the lower frame sub-assembly and the seat back sub-assembly are installed on a school bus. 
   
   
       3 . The modular seat frame as claimed in  claim 2  wherein the first open support neck and the second open support neck are bolted to the opposed ends of the upside-down U shaped partial perimeter tube. 
   
   
       4 - 6 . (canceled) 
   
   
       7 . The modular seat frame as claimed in  claim 1  further comprising:
 reinforcement members located at the joints formed between the opposed ends of the upside-down U shaped partial perimeter tube and the first open support neck and the second open support neck.   
   
   
       8 . The modular seat frame as claimed in  claim 8  further comprising:
 a seat back panel suspended on and within the upside-down U shaped partial perimeter tube.   
   
   
       9 . The modular seat frame as claimed in  claim 8  wherein the seat back panel includes a partial perimeter lip by which the seat back panel is attached to the upside-down U shaped partial perimeter tube. 
   
   
       10 . The modular seat frame as claimed in  claim 1  wherein the first riser and the second riser include integral inwardly turned flanges and back edge flanges that support front and rear cross members.