US1575772A - Grating - Google Patents

Description

March 9,1926. 1,575,772

M. LACHMAN GRATING Filled Jan. 9. 1925 l 2v Sheets-Sheet 1 ULI'LJUU .March 9 1.926. 1,575,772 v M. LAcHMAN GRATING `Filed Jan. 9. 1925 2 sheets-sheet a N LLI :Il: A EQ /1 ne@ :i

DE L 3E DE DEQ' UE UE DE I L r r1 I J J cx: INVENTOR MM2/c5 Lac/mmv ATTORNEY;

Patented Mar. l9, 1926.

UNITED STATES PATENT oFFlcE.

GBATING.

Application tiled January 9, 1926. Serial No. 1,369.

To all whom t may concern.'

Be it known that I, MAURICE LACHMAN, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements fin Gratitngs, of which the'following is a specificaion.

My invention relates to metal gratings of the kind especially adaptable for use as side-walk or floor gratings and useful for other purposes as well and the object of the invention, among other things, is to provide a grating that shall he of great strength and stiffness and free from liabilityto twisting or tilting of the members of the grating upon one another' and that shall at the same time not afl'ord ready opportunity for the collection of dirt and shall likewise afford a maximum of light open-r ing for the amount of material entering into the construction.

A further object of the invention is to provide a grating that may be cheaply constructed entirely from standard rolled bars.

The invention will be described in con' nection with the, accompanying drawing, from which description the novel features of construction and the manner kin whichl the objects and purposes of my invention are accomplished will be manifest, and then on the line 4-4.

Fi 5 shows a preferred formfof spacing member or lnsert of my invention.

Fig. 6 shows the manner of use of the spacing member shown in Fi 5 by illustrating in plan a fragment o the grating and makes clear also the position of the welds as indicated at.3 in the case of one of them.

f tween the said membersv and at right angles thereto and `the plane of each web 1part 1s and the welding electrode is a Fig. 7 shows in section a modified form of channeled spacing insert that ymay be employed in carrying out the invention in place of the special form shown in Fig. l.

Referring to the accompanying drawings: 1 indicates the parallel spaced principal members of the grating spaced apart by spacing inserts or members 2. Said spacing inserts consist each of a flanged member of any of the forms shown in end view or section in the various figures or of any other form providing a web or body portion the edges of which are flanged, the outer face of each flange being at substantially right angles to the plane of the web. These forms permit the utilization ofta section or portions of a rolled metal bar cut up into suitable lengths by transversely vsectioning the bar to provide the aforesaid inserts or spacing members. Said bar may be of the form for instance shown iny cross section in Figs.

4 and 4.-, said spacing sections beingl obtained by transversely cutting the rolled metal bar into suitable lengths as indicated by the cross dotted lines in Fig. 3. If desired, how-v ever, the special form of flanged spacing member shown in Fig. 7 might be employed in place of'that indicated in Fig. 1 or, and preferably, each member might be of the form indicated in Fig. 5 and consist of a section of rolled flanged or channel bar of I form or double channel for-m affording fianges useful like those of the single channel bar or member but with the advantage to be presently described over the single channel bar or member.

As clearly shown in the figures, the outer faces of the flanges of each spacing member or insert which before sectioning are the fianges of the liangedbars engage against` the fiat faces of the parallel members v1 while the web part of each member or secf tion ofthe bar extends across the space be' practically transverse tothe general plane of the grating'. Each said insert is fastenedV I securely to the bars lby its opposite fianges preferably by electric welds one of which, is indicated in dotted lines at 3.

In welding these parts together I em loy preferably the resistance process of wel ing, lied to the outer face of the bar or bars, he weldin pressure` being exerted in line with the we part 1 of the spacing member which extends across the space between the bars 1. As will be seen, by thus disposing the flanged spacing inserts, .the web part 1 affords a support which efl'ectually sustains the welding pressure and permits :a good weld to be made. Y

In constructing the grating from the parts suitably assembled the work may be done one Section at a time or it is even possible to weld two or more sections at once owing to the rigid manner in which the parts are sustained'in their finished relation by the manner of disposing the flanged inserts. Furthermore it will be seen that the flat outer faces of the flanges afford extended bearing surfaces a ainst the flat surfaces of the parallel mem rs and thus effectually resist the tendency to twisting or distortion of the finished grating. Furthermore it will be seen that the grating affords a minimum obstruction to the passage of light and that there are no pockets which can .readily collect dirt or refuse. This freedom from tendency to collect dirt is accentuated by the use of the particular form of insert illustrated in Fig. 1 iny which the flange tapers outwardly from' the web part, thus affording' a 'wide angle at the meeting point of the inner side of the web part and `theinside of the flange or side of the channel.

I do not limit myself to this form of channel section as the form illustrated in Fig. 7 might be used but with less advantage so far as relates to freedom from collection of refuse.

Furthermore it willbe seen that the particular form shown in Fig. 1 has advantages in respect to strength at the oint wherefthe welding pressure 1s employe since it is desirable that the Weld be made near the position of the web 1. y

Inthe form of my invention illustrated 11i-Fig. 1,- when the weld is made near the b ase of the channel, as shown, there may be slme undesirable tendency to the formation 0f the flash or bur of heated metal which might be forced out sidewise beyond the l1ne ofy the underside of the channel, thus forming an unsightly projection in the corner whlch would moreover tend to collect dirt. The double channel or I-form of spac` 1ng member which is illustrated in Fi 5 and which ma each be a section of ro led metal bar ordinaril described as an I-bar may used to obviate the latter objection. In us1ng this form the insert section or memO 'ber is employed in the same way as the chanf nel sectioni ustrated in Fig. 1. In this case the head and foot of the I-section constituting f theflanges extend in opposite directions from .the stem or web part so that when'the weld is formed inline with said'stem there can be vno pssibilit of the flash or bur of the Weld being extr'u ed or exposed -while at the same time the web is in position to effectually sustain the pressure of the tool used in fastening the insert members in position.

By the use of my invention it will be seen that a grating may be readily constructed from ordinary rolled metal hars or shapes as they come from the mill by cutting up the flanged bars into sections or len hsofbar suitable to form the desired dept vertically or transversely of the general planeof the grating and that said shapesparticularl lend themselves tothe assembhng and eectric Welding of the elements of the grating together in a manner to form a grating of great strength and greatresistance to twisting or tilting owing to the wide bearings afforded by the flanges and to the fact that the flat outer faces of the flanges and the flat faces of the bars are effectually secured together by the cheap process of resistance welding, A i Furthermore the grating may be made of very pleasing appearance and will be free from the objection of readily collecting dirt. It will also -give a greater light area than many previous forms of grating and is well adapted to sustain heavy loads when used as a floor or pavement grating. It also affords a large wearing surface and is far superior to those forms in which strength is aimed at by lemploying crossing members notched into parallel bars or members.

What I claim as my invention is l. A grating comprising principal parallel spaced members consisting of a series of bars set on edge and independent flanged spacing members, the flange of each said flanged members lying flat against the inside flat of the bar while the web of the flanged member extends at right angles from the bar engaged b said flan e and across the space between ars, and with the plane of each web dis osed transversely to the general plane of t e grating.

' 2. A4 grating comprising parallel spaced members conslsting of bars7 presenting to the space between them flat surfaces and spacing inserts consisting of disconnected channeled members the flanges of which engage at their outside flat, surfaces a ainst the opposed surfaces of said series o bars and are welded thereto to comprise the spacing members of the structure, the plane of the web of .said channel being disposed at right angles both to the general plane of the ratmg and to the p anes of said parallel ars.

3. A grating comprising a series of paraces and spacing inserts consistin of elements I-shaped'in cross-section an having the head and foot of each I-section engaged at its outside with the flat opposed surfaces of the parallel bars and welded thereto on a plane including the web of the eleallel spaced members having opposed flat 1Q oiitn-ardly from the Web portion of the nient, tlie web of eacl'i Lscction being disposed in a plane transverse to the general plane of tlie grating and describing approximately a riglit angle lo llic opposed fares of tlie parallel members.

4. A grating comprising parallel spaced members consisting of a series of bars set on edge and spacing inserts consisting ot flanged members the flanges of which taper member, said flanges engaging by their flat outer surfaces and being Welded to the op posed faces ot the parallel bars while tbe web part of the member is disposed transversely to the general plane of the grating and tlie Web itself extending substantially at riglit angles from the faces of said parallel members.

5. As a new article of manufacture, a ii'ietal grating comprising parallel spaced members and interposed spacing inserts consisting of transverse' sections of rolled flanged metal bars with the web of each section transverse to the plane of the grating and each said section engaging by the fiat outer face of each fiange against the flat face of said members and being Welded thereto as and for the purpose described.

6. As a new article of manufacture,y a metal grating comprising parallel spaced members and spacing inserts electrically welded between said members andconsisting y bers, tlie weld between thel insert and membei' being on a line with the web portion of said insert. f

7. A grating comprising longitudinally lext-ending spaced supporting'members and spacing inserts securedbetween said members, saidinserts comprising separate transverse sections of Banged bars disposed transversely of the plane of the grating, the outer faces of said inserts being Welded to said members, the Webs thereof serving to space said members and' to receive the pressure applied to said members during the Welding process.

Signed at New York in the county of New York and State oi New York this 8th day of January A. Dfll925. R

MAURICE LACHMAN.

Images