US 2281822 A
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Description (OCR text may contain errors)
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Patented May 5, 1942 METAL GRATING Claud H. Bills and George ELYoung,
Los Angeles, Calif.
Application September 24, 1938, Serial No. 231,556
This invention relates to a metal grating construction, particularly useful in the construction of stairways, walkways, surface walks, and the like, where it is desirable, as Well as necessary, to prevent slipping on the grating.
An object of our invention is to provide a novel metal grating construction, in which the strength of the grating is increased by means of a novel arrangement of embossed areas, through which holes or openings are out.
Another object of our invention is to provide a novel metal grating of the character stated, in which the openings in the embossed areas of the metal are cut so as to leave straight, vertical edges, thereby increasing the gripping effect of the grating, and also preventing th clogging of these openings with dirt and the like.
Still another object of our invention is to provide a novel metal grating of the character stated to increase the bending strength of the metal plate over a flat sheet, by means of a novel arrangement of embossed areas in the grating, even though a substantial part of the metal is cut away to provide openings through the metal plate.
Still another object is to provide a metal grating of the character stated, which is reversible so that when one area becomes worn, th plate can be reversed and again utilized for a substantial period of time.
Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description, and the appended claims.
In the drawing:
Figure 1 is a fragmentary perspective view of our metal grating.
Figure 2 is a fragmentary, top plan view of the same.
Figure 3 is a sectional view taken on line 3--3 of Figure 2.
Figure 4 is a fragmentary, plan View of a modified form of opening provided in the metal gratmg.
Figure 5 is a sectional view taken on line 5-5 of Figure 4.
Figure 6 is a fragmentary plan view of still another modified form of opening through the metal grating.
Figure 7 is a sectional view taken on line 'l! of Figure 6.
Referring more particularly to the drawing, the numeral I indicates a metal sheet, one longitudinal edge of which is bent downwardly as shown at 2, while th opposite edge is bent upwardly as shown at 3. The side edges of the plate are bent both upwardly and downwardly, a shown at 4 and 5. The reason for this construction is to make the plate reversible so that when one surface becomes worn, the plate can be reversed and its useful life thus continued. The plate I can be made of any desired length or width, depending on the use to which the plate might be put.
Our metal grating can be used as a step in a stairway or as an overhead or ground grating, uch as are used in various industrial plants, in the oil fields, and elsewhere.
The horizontal surface of the plate I is provided with alternate rows of upwardly and downwardly extending embossments 6 and I. The embossment 6 extends upwardly, and the adjacent embossment 1 extends downwardly. An opening 8 extends through each of the embossments, and as shown in Figures 1, 2 and elsewhere, the embossments overlap. Taking Figure 2 as an example, the embossments 6 are spaced apart and are aligned as shown, and the embossments 1 overlap the spaced embossment 6. Due to this overlapping of the plate embossing, the transverse strength of the plate is not decreased, but on the contrary is even increased over the transverse strength of a flat plate. With our arrangement, there are no weak lines between adjacent holes. The embossing or ribbed effect of the plate increases its strength even though the holes 8 are punched out of the metal.
In fabricating the flat sheet, it is first embossed, then the holes 8 are punched, thereby providing straight vertical edges 9, thereby presenting a sharp edge to the shoe of the workman. If the edges 9 were tapered, dirt and the like would tend to accumulate in the holes, and the gripping action of the sharp edges would be materially reduced. With our construction, the grating is self-cleaning and due to the fact that alternate embossments are depressed, an effective water drain is provided.
In Figure 4, we have shown the same general type of grating previously described, with the exception that the holes and the embossments are diagonally shaped, as shown at It) and H respectively.
In Figures 6 and '7, we have illustrated still another form of metal grating, the general construction being similar to that described in Figures 1 to 3 inclusive. With this latter ar- 5 rangement, however, a rib i2 is provided between adjacent embossments for the purpose of additionally strengthening the transverse section of the grating. The ribs I2 preferably join adjacent aligned embossments, as shown in Figure 6. The openings through the embossments are the same as described and shown in Figure 2.
Having described our invention, we claim:
1. A metal grating comprising a plate, a plurality of rows of elongated embossings on the plate, each elongated embossing having an opening therein, the elongated embossing in one row overlapping the elongated embossing in the adjacent row, whereby the transverse strength of the plate is strengthened, the alternate rows of embossings being bent upwardly and downwardly whereby a drain is provided for the grating, an upwardly bent flange on one edge of the grating, a downwardly bent flange on the other edge of the grating, and upwardly and downwardly bent flanges on each side of the grating, whereby a reversible grating is provided.
2. A metal grating comprising a plate, a plurality of rows of embossings on the plate, each embossing having an opening therein, the embossing in one row overlapping the embossing in the adjacent row, whereby the transverse strength of the plate is strengthened, and ribs extending between adjacent embossings in each row.
CLAUD H. BILLS. GEORGE E. YOUNG.