Patent ID: 8341921
Filing Date: 2013-01-01
Classification: E04B,E04C,Y10T

Abstract:
1. An integral one piece sheet metal steel joist for use in floor systems, formed of a single integral piece of sheet steel, and comprising; a web defining first and second edges and an axis, and first and second web side surfaces; an edge wall on at least one of said first and second edges of the web, bent at a right angle and extending from said first web side surface; identical symmetrical main openings formed through said web at spaced intervals therealong, of predetermined size and profile, with rounded ends and linear sides parallel to one another; channel portions of said web around said openings remaining attached integrally to said web along opposite linear sides of the opening; reinforcing channels formed from said channel portions extending along each of the two opposite linear sides of said main openings and defining a first right angle channel bend formed in each said channel portion, whereby said channel portion is displaced from said first web side surface, and a second right angle channel bend formed in each said channel portion parallel to and spaced from said first channel bend, said first and second right angle channel bends being formed along axes parallel to one another and parallel to said web axis; intermediate walls formed from said channel portions extending between said first right angle channel bend and said second right angle channel bend, whereby to form said channel portions into generally U-shaped right angular channel sections extending out from said first side surface of said web, whereby said second side surface of said web remains smooth and free of obstructions; depressions formed in said web at spaced intervals, extending from said first side surface of said web; and, depression openings formed in said depressions to reduce sound transfer through the joist.