Untitled record

Application filed November 14,1889. Serial No. 330,352. (No model.)

To all whom it may concei'n;

Be it known that I, Sinclair Stuart, of Plainfield, in the county of Union and State of New Jersey, have invented a new and use5 ful Improvement in Channel-Irons, of which the following is a specification, reference being had to the accompanying drawings.

This invention relatestothe “channel-iron,” commonly so termed, used in various Onto gineering and other structures and which is composed of a web and two flanges projecting from opposite edges of the web. Such channel-iron has been heretofore commonly constructed with the web and flanges of uni15 form thickness, or, if the web has been thicker than the flanges, it has been of uniform thickness throughout its width. It is found in practice that the web of the channel-iron so constructed, especially when the web is made 2o no thicker than the flanges, is apt to buckle or bend along the middle of its length.

The object of my invention is to give strength to the web of the channel-iron without unnecessarily increasing its weight, and 25 to this end I make the web of greater thickness along the middle than near the flanges and than the flanges; and my improvement consists in a channel-iron having the central part of its web of greater thickness than the 30 parts near the flanges and than the flanges themselves.

Figures 1, 2, and 3 in the drawings represent, respectively, transverse sections of three different examples of my invention.

A designates the web or back of the chan- 35 nel-iron, and Β B designate the flanges thereof projecting from the edges of the web or back at the sides thereof. In all these examples the central part of the web or back is thicker than those parts thereof adjacent to 40 the flanges and thicker than the flanges themselves. In Fig. 1 the outside of the web or back is flat, and the extra thickness is produced by giving the inner face a salient curvature. In Fig. 2 the greater thickness is 45 produced by giving both the outer and inner faces of the web or back salient curvatures. In the example shown in Fig. 3 the greater thickness is produced by giving one of the faces an angular form. 50