Step support method for use in the manufacturing of straight or curved stairs

Abstract

A step support method for use in the manufacturing of straight or curved stairs comprising a plurality of cutouts and a plurality of formed flanges in a contiguous sheet of metal creating a surface for stair treads and risers to be attached. The design of which allows the embodiment to serve structurally as being load bearing. With the addition of slits in the tread support flange, the embodiment can be applied to the manufacturing of curved stairs as well.

We claim:  
     
         1 . A step support method for use in the manufacturing of straight or curved stairs comprising: 
 a contiguous sheet of metal;    a plurality of cutouts proportionate to the rise and run of a desired step;    a plurality of flanges to which a plurality of treads and risers may be attached to form said desired step;    a flange or surface wherein the said step support can be mounted or attached to a structure.    
     
     
         2 . The step support of    claim 1    wherein an adjoining surface of sheet metal is load bearing.  
     
     
         3 . The step support of    claim 1    wherein a flange formed on the bottom edge of the stringer provides extra strength.  
     
     
         4 . The step support of    claim 1    wherein a flange formed on the bottom edge of the stringer creates a surface to attach finished or structural materials or walls.  
     
     
         5 . A step support method wherein the tread support flanges have slits by which means the stringer can flex.  
     
     
         6 . The step support of    claim 5    with material laminated on at least one side of stringer.  
     
     
         7 . The step support of    claim 5    with material laminated on at least one side of stringer providing a surface whereby finished or structural materials can be attached to the underside of stairs.