Joist hangers

Abstract

A connection between a beam and a joist by a sheet metal joist hanger employs a joist hanger comprising a pair of mutually spaced parallel side walls receiving the joist between them, a seat portion extending beneath the joist between lower ends of the side walls, a pair of co-planar rear flanges integral with the side walls and extending in opposite directions from the rear edges of the side walls at right angles to the side walls, a pair of top flanges integral with the rear flanges and projecting rearwardly from upper edges of the rear flanges, metal projections extending rearwardly from the rear flanges adjacent the first fastener openings and penetrating the beam, the metal projections being formed by punching metal from the rear flanges to form the fastener openings, with fasteners extending through the fastener openings into the beam. Further metal projections formed by punching metal from the top flanges to form the further fastener openings extend downwardly from the top flanges and penetrate the beam and further fasteners extend through these further fastener openings into the beam.

I claim:  
     
         1 . In combination, first and second wooden building components and a sheet metal joist hanger connecting said first and second components to one another; 
 said joist hanger comprising a pair of mutually spaced parallel side walls receiving said first component therebetween, said side walls having upper and lower ends and front and rear edges;    a seat portion extending beneath said first wooden building component between said lower ends of said side walls;    a pair of co-planar rear flanges integral with said side walls and extending in opposite directions from said rear edges of respective ones of said side walls at right angles to said side walls;    said rear flanges having upper edges;    a pair of top flanges integral with said rear flanges and projecting rearwardly from said upper edges of said rear flanges;    a plurality of fastener openings in said rear flanges;    metal projections extending rearwardly from said rear flanges adjacent said fastener openings and penetrating said second wooden building component, said metal projections being formed by punching metal from said rear flanges to form said fastener openings; and    fasteners extending through said fastener openings into said second wooden building component.    
     
     
         2 . A combination as claimed in  claim 1 , wherein said metal projections extend around the peripheries of said fastener openings.  
     
     
         3 . A combination as claimed in  claim 1 , wherein said metal projections are serrated.  
     
     
         4 . A combination as claimed in  claim 2 , wherein said metal projections are serrated.  
     
     
         5 . A combination as claimed in  claim 1 , wherein said fastener openings are circular.  
     
     
         6 . A combination as claimed in  claim 1 , wherein said fastener openings are polygonal.  
     
     
         7 . In combination, first and second wooden building components and a sheet metal hanger connecting said first and second components to one another; 
 said hanger comprising a pair of mutually spaced parallel side walls receiving said first component therebetween, said side walls having upper and lower ends and front and rear edges;    a seat portion extending beneath said first component between said lower ends of said side walls;    a pair of co-planar rear flanges integral with said side walls and extending in opposite directions from said rear edges of respective ones of said side walls at right angles to said side walls;    said rear flanges having upper edges;    a pair of top flanges-integral with said rear flanges and projecting rearwardly from said upper edges of said rear flanges;    fastener openings in said top flanges;    metal projections formed by punching metal from said top flanges to form said fastener openings, said metal projections extending downwardly from said top flanges and penetrating said second wooden building component; and    fasteners extending through said fastener openings into said second wooden building component.    
     
     
         8 . A combination as claimed in  claim 7 , wherein said fastener openings are triangular and said metal projections are triangular prongs.  
     
     
         9 . A combination as claimed in  claim 8 , wherein said prongs extend from concavely curved sides of said fastener openings.  
     
     
         10 . In combination, first and second wooden building components and a sheet metal joist hanger connecting said first and second components to one another; 
 said joist hanger comprising a pair of mutually spaced parallel side walls receiving said first component therebetween, said side walls having upper and lower ends and front and rear edges;    a seat portion extending beneath said first wooden building component between said lower ends of said side walls;    a pair of co-planar rear flanges integral with said side walls and extending in opposite directions from said rear edges of respective ones of said side walls at right angles to said side walls;    said rear flanges having upper edges;    a pair of top flanges integral with said rear flanges and projecting rearwardly from said upper edges of said rear flanges;    a plurality of first fastener openings in said rear flanges;    first metal projections extending rearwardly from said rear flanges adjacent said first fastener openings and penetrating said second wooden building component, said first metal projections being formed by punching metal from said rear flanges to form said first fastener openings;    first fasteners extending through said first fastener openings into said second wooden building component;    second fastener openings in said top flanges;    second metal projections formed by punching metal from said top flanges to form said second fastener openings, said second metal projections extending downwardly from said top flanges and penetrating said second wooden building component; and    second fasteners extending through said fastener openings into said second wooden building component.    
     
     
         11 . A combination as claimed in  claim 10 , wherein said first metal projections extend around the peripheries of said first fastener openings.  
     
     
         12 . A combination as claimed in  claim 10 , wherein said first metal projections are serrated.  
     
     
         13 . A combination as claimed in  claim 11 , wherein said first metal projections are serrated.  
     
     
         14 . A combination as claimed in  claim 10 , wherein said first fastener openings are circular.  
     
     
         15 . A combination as claimed in  claim 10 , wherein said first fastener openings are polygonal.  
     
     
         16 . A combination as claimed in  claim 10 , wherein said second fastener openings are triangular and said second metal projections are triangular prongs.  
     
     
         17 . A combination as claimed in  claim 8 , wherein said prongs extend from concavely curved sides of said second fastener openings.