Stair bracket

Abstract

A stair bracket system, having a plurality of modular brackets, which can be assembled together to fabricate the risers for a flight of stairs, each of the brackets having a bottom edge, front and back end edges, a top edge, and, an attachment flange.

What is claimed is:  
     
         1 . A stair bracket system, having a plurality of modular brackets, which can be assembled together to fabricate the risers for a flight of stairs, and comprising; 
 a plurality of brackets and each in turn having, 
 a bottom edge;  
 front and back end edges;  
 a top edge; and,  
 openings for receiving fastenings for securing said brackets together.  
   
     
     
         2  A stair bracket system as claimed in  claim 1 , and including an attachment flange extending upwardly above said top edge.  
     
     
         3 . A stair bracket system as claimed in  claim 2  and wherein each said front end edge includes a notch shaped to receive a said flange.  
     
     
         4 . A stair bracket system as claimed in  claim 1  and wherein at least some of said brackets include a generally triangular discard portion extending downwardly from said bottom edge.  
     
     
         5 . A stair bracket system as claimed in  claim 4  and wherein each said bracket includes a short diagonal junction portion extending between said bottom edge and said back end edge.  
     
     
         6 . A stair bracket system as claimed in  claim 5  wherein each said edge is formed of a generally T-shaped cross-section.  
     
     
         7 . A stair bracket system as claimed in  claim 5  wherein said bottom edge said end edges and said top edge and said diagonal edge enclose an open space  
     
     
         8 . A stair bracket system as claimed in  claim 4  wherein said discard portions are removed from two of said brackets, whereby to permit said bottom edges of said brackets to lie on a surface, at a lower end of said assembly.  
     
     
         9 . A stair bracket system as claimed in  claim 1  wherein said brackets are molded from plastics material.  
     
     
         10 . A stair bracket system as claimed in  claim 4  wherein said back end edges are formed with downwardly directed hooks, and wherein said discard portions are formed with front edges defining notches, and upwardly directed hooks at the lower ends of said notches.  
     
     
         11 . A stair bracket system as claimed in  claim 10  wherein said back end edges are formed with recesses, and wherein said discard portions are formed with front edges defining bosses to interfit with said recesses.  
     
     
         12 . A stair bracket system as claimed in  claim 10  wherein said main body defines a generally circular open space.  
     
     
         13 . A stair bracket system as claimed in  claim 1  including a plurality of vertical ribs and a plurality of horizontal ribs, said ribs extending between said top and bottom edges and said front and back edges, and defining a generally honeycomb shaped structure.  
     
     
         14 . A stair bracket system as claimed in  claim 13  including panels formed between said vertical and horizontal ribs.