Joist-hanger.

Application filed MaTcb. 29,1905. Serial No, 252,682.

Patented Nov. 14, 1905.

To all whom it may concern:

Be it known that I, Alfred Carlson, a citizen of the United States of America, and a resident of Chicago, in the county of Cook and 5 State of Illinois, have invented certain new and useful Improvements in Joist-Hangers, of which the following is a specification.

This invention relates to hangers adapted to support the ends of the floor-joists of buildio ings, and has for its object to provide a simple and efficient structural formation of the hanger parts whereby a maximum degree of strength with a minimum weight of metal is provided in the hanger, as will hereinafter 15 more fully appear and be more particularly pointed out in the claim.

In the accompanying drawings, Figure 1 is a perspective view of a joist-hanger embodying the present invention. Fig. 2 is a verti20 cal sectional elevation of the same at line x

Fig. 3. Fig. 3 is a front elevation. Fig. 4 is a front elevation of a modified form of the hanger.

Similar numerals of reference indicate like -35 parts in the several views.

As represented in the drawings, the joisthanger is formed of wrought metal bent upon itself in various planes to constitute a lower horizontal web or seat 1, counterpart triangu30 lar intermediate side webs or wings 2 at right angles to the horizontal web 1, and upper horizontal webs or bearing-flanges 3, as usual in the present type of joist-hangers now in general use.

The material part of the present improvement consists in providing the vertical side wings or webs 2 with vertical flanges 4 along their rear edges, which flanges extend toward each other, as shown, and at their upper ends constitute direct angular extensions of the 4° horizontal bearing webs or flanges 3. As so formed a hanger structure is provided having a maximum degree of strength combined with minimum degree of lightness in that the strain upon the parts in actual use is in direct ver- 45 tical lines, with an entire avoidance of the oblique torsional strains usual to the ordinary hanger construction and requiring a shearing stress to overcome the support afforded by the present hanger construction. 50

It is within the scope of the present invention to make the vertical rear flanges 4 of a rectangular form, as shown in Figs. 1 and 3, or of a triangular form, as shown in Fig. 4, and as the judgment of the constructor may 55 deem best to meet particular circumstances.