US2155694A - Grating - Google Patents

Description

F. TENCH 2,155,694

GHATING April 25, 1939.

Filed July 24, 1937 edemzsir.

Patented Apr. 2s, 1939 l 2,155,694

4UNITED STATES PATENT ori-ICE uname Frederick Teneh, White Plaim, N. Y., assigner so L. 'l'. Corporation, a corporation of New ersey Application July 24, 1937, Serial No. 155,379

8 Claims. (Ci. 18S-$2) This invention relates to metallic gratings par- In the accompanying drawing showing a practicularly adapted for use as sidewalk or floor tical illustration of the invention: gratings and which comprise a plurality of spaced Fig. 1 is a perspective view of a portion of the bearing members to which a plurality of spaced completed grating.

crossing members are welded or otherwise se'- Fig. 2 is an enlarged end elevation of a portion -5 cured thereto to form a completed rigid structhereof. ture. Fig. 3 is a side elevation thereof.

The principal object oi the invention yis the Referring in detail to the drawing in which a production of agrating having a minimum weight practical embodiment of the invention is illus- 10 of material with a maximum of strength. trated: 10

A further object of the invention is the pro- The web portions of the bearing bars are induction of a grating of the character above dedicated at i while 2 indicates the head portions scribed in which the parts employed therefor thereof. These bearing bars comprise fiat thin preferably are standard ones, such, for instance, metallic plates of standard size and form and the as ordinary bars and rods of standard dimenhead members 2 thereof are produced by bending l5 sions, so that no special manufacture or rolling around or lapping or folding over on themselves of the parts making up the finished structure and preferably into engagement therewith the is necessary. g upper ends of said plates to form the member By preference, the bearing or longitudinal illustrated whereby the heads 2 comprise a double members of my improved grating comprise comthickness oi' metal. During the bending and fold- 20 paratively thin metal plates or bars disposed on lng operation longitudinal shoulders 2 are proedge so as to provide a maximum of resistance duced which lie Vadjacent the free edges of the to force applied under compression. The upper bent ends of the web as shown in the drawing. edges of said bearingbars are preferably bent Said heads 2 each has an upper curved or around or lapped or folded over on themselves in rounded edge or surface, the apex of which is 25 the manner to be presently described and as in vertical alignment with the central vertical illustrated to provide a rounded enlargement on plane of the web I of the bearing bar to Produce the upper edge thereby producing or securing a balanced symmetrical member of stable equalia modified form of 'r-bar without the employbrium. 'I'hese bearing bars or longitudinal memment of a specially rolled bar. This rounded bers are preferably cililidiStS-Dtly SDB-ccd apart 30 enlargement or head not only considerably infrom cach other and crossingy members compriscreases the strength of the bearing member 1ting rods or bars l of standard construction and self but also provides an abundance of mate. size are welded or otherwise secured transversely rial for-the welding of the crossing members 'thereto Bt Spoccd distances Preferably by the y thereto and appreciably facilitates the welding clcctliccl resistance welding method. The elec- 36 operation. The head or enlargement, especially tricl Welding is effected in such manner that in the ease of 9, sidewalk grating, obviously need the crossing rods or members 3 are embedded in be onlyon the upper edge of thebar or plate the heads of the bearing bars with the exception and the lower edge may be an integral part oi' of B- mi] Dart only which 1166 in c Pla-ne Slightly o and of uniform cross-section with the body -or above the upper surfaces of the upper edges 40 web portion of the member. It has been found 0f thc DiccS 01' the hcd of said bearing bars in practice that under compression the bearing t0 thereby provide l l10n-.Slip treed in thc nmember without a head is susceptible to twistished Productw ing or buckling under great stress but these dis- It Will be obvious from tiliv cboVc description advantages have been eliminated by the present that the Hating Produced according t0 the in- 45 invention. I have also found that when the pres- Vcntion may be tcl'mcd l Soif-cleaning" One ent construction is employed it has been found for the reason that the rounded heads 2 of the feasible to eliminate a large number of bearing bearing bots und `the rounded crossing 0l' trans- `bars which would ordinarily be necessary, thereverse members I provide surfaces over which by decreasing the weight of the completed strucdirt or other foreignV matter Will easily Slide 50 ture without sacrificing any of its strength.V Also downwardly intermediate the interstices formed by providing a head I have found it possible to by the bearing bars and the crossing members. employ a small or thin gauge of metal bar which Furthermore, the heads of said bearing bars also appreciably decreases the weight of the comprovide a shield for the web portions thereof so pleted structure. that 'dirt or foreign matter passing through the u the welding operation which obviously would beobjectionable. Also the increase of welded mass afforded by the enlargement of the bearing bars at their upper edges is useful in providing addi-v tional strength at this point where the grating may be called upon to resist twisting and bending forces, and as already indicated, it avoids the weakening effect which would result from using a thin plate having no reinforcement at the edge where the weld is to be formed.

The bearing members constructed in the manner described are employed to produce a modiiied form of T-bar in order to obviate the expense of a specially rolled T-bar although it will be under- Y shoulder on each of said webs positioned in juxtastood that the employment of a rolled T-bar for the bearing members is within the scope of my invention.

It will also be apparent that the structure described and claimed may be used in metallic structures other than gratings.

The invention claimed is:

1. A metallic grating provided with a plurality of spaced bearing bars comprising plates set on edge with the upper ends lapped or bent over to provide heads having a double thickness of metal each having a free edge lying adjacent the bearing bar and a. plurality of spaced crossing rods welded to said heads.

2. A metallic grating comprising -a plurality of spaced plates forming bearing bars set on edge with their upper ends folded over to provide heads having rounded surfaces the apices of which lie substantially in alignment witha vertical plane taken through the centers of said plates and spaced crossing members embedded in andelectrically welded to said heads.

3. A metallic structure provided with a plurality of spaced bearing bars comprising plates each having a web and a head integral therewith, said heads overhanging said webs and being formed by bending over the upper ends of said plates to form a plurality of thicknesses of metal in substantial parallelism and spaced crossing members welded to the heads of said bearing bars.

4. A metallic structure provided with a plurality of spaced bearing plates each having a web and a head integral therewith, said heads being rounded on their upper surfaces and overhanging said webs and being formed by lapping over the upper ends of said plates into engagement with the webs andspaced crossing rods embedded in and electrically welded to said heads.

5. A metallic structure provided with a plurality of spaced longitudinal bars of substantially the same width and depth throughout their lengths and each including a web member and an enlarged head integral therewith, said heads comprising the ends of said webs and being formed by lapping over the ends of said webs whereby said heads are formed of a plurality of thicknesses of the metal of said webs and spaced crossing members welded to the heads of said longitudinal bars,

6. A metallic structure provided with a plurality of spaced longitudinal members comprising plates each having a web and a head integral therewith consisting of a lapped 'over end of the web, a

positionv tota free end ofA said webs and spaced crossing members welded to the heads of said l'longitudinal members.

Y ping over theends of -said webs whereby said heads are formed yof a-plurality of thicknessesof the metal of said webs positioned-in substantial parallelism with each other and spaced crossing members welded to the heads of said longitudinal 8. A metallic structure provided with a plurality oi spaced longitudinal bars of substantially the -same width and depth throughout their lengths

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