US1748284A - Corner bead - Google Patents

Description

Feb- 25, 1930. n H. M.-GERSMAN 1,748,284

CORNER BEAD Filed June 26, 1924 2 Sheets-Sheet 2 Y Patentedy Feb. 25, 1930 UNITED STATES 'PATENT OFFICE l' HARVEY M. vG-ERSIVIAIT, OF BUFFALO, NLFVV YORK, ASSIGNOR TO KALNIAN STEEL COMPANY, yII\`|'AC.j 'OF CHICAGO, ILLINOIS, A CORPORATION 0F DELAWARE .i

CORNER,` BEAD Application filed .Tune 26, y19524:. Serial No. 722,612.

This invention relates to improvements in beads or strips for the reinforcement of the corners of, plaster finished walls and proposes a corner-bead which is constructed of expanded sheet'metal. i p

The principal objects of the invention are to provide a corner bead which may be eco,-y nomically produced, having regard both to rthe manner of its production and to the amount ofA metal required, and to secure certain pronounced advantages in use which will more'fully appear as the description proceeds. f i

Y The improved corner bead is characterized by parallel strands incorporated in the wings which extend from the apical nose, which strands are presented edgewise so as to oppose minimum'v resistance to the application of the plasterand to aiiord flat surfaces for the better supportt of the plaster. The bead is also distinguished by the novel relation of the strands to the nose and to the planar edge portions or terminal flanges of the wings; thus the' nose adjoins and projects from the outer edges ofthe strands whereby the outer edges of the strands of each wing lie in a plane which is spaced a substantial distance behind a parallel plane touching the nose side adjacent snch wing; the commonplane of the axes of the strands of each-wing is parallel to the projected plane yof the terminal flange'of the wing, and the expansion is continued right up to the apical nose. YBy these further characteristics advantages are obtained as follows: The thickness of the plaster infront of the wings is sufficient at all points to avoidany'liabiiitv of cracking; the terminaledgesmay inall lcases be used for lining up-the bead regardless of any 'differences in angularity between the corner to be reinforced and the angle formed by the intersectiony of the planes of the terminal flanges, andthe plaster is keyed right up to the nose ofthe bead whereby a fullmonolithic corner structure reinforced by expanded metal and having a solid metal edge is obtained.

Other advantages of the present corner bead are that it has maximum keying and clinching edects and sufficient stiffness to involve a self-sustaining property which will serve for all practical purposes.

In the accompanying drawings I have illustrated the invention ina form which as rnow considered is preferred and I have also shown various steps in its production in order to illustrate the method of manufacturing the same. y

n In said drawings:

Figure 1 is a perspective view of the corner bead. Figure 2 is a side elevation thereof.

Figure 3 is al'horizontal sectional' View showing the corner bead in use.

yFigures 4 to 11 illustrate the manufacture of the same.

Figure 4 being an edge view of the blank.

Figure 5 a plan view thereof.

Figures, 7 and 8 edge views schematically showing different steps in the course of manufacture.

Figures 9 and 10 bottom plan views showing different stages of the operation indicated by Figure 7, the stages which these views illustrate being shown by the lines 9 9 and 10-10 of Figure 7.

Figure 11l a cross section of the bead., y 1

Figures 12, 13 and 14 illustrate the manufacture of an alternative form.

Figure 12 being a plan view of the blank.

Figure 13 a bottom plan view showing a completed stage in the course of manufacture, and

nose. The wings are of expanded metal construction and includey parallel, preferably horizontal,strands 3 and planar edge portions or flanges 4. rFlic strands 3 extend be- :it A, is parallel to the tween the nose l and the flanges 4 and are presented edgewise, their flat faces being in horizontal or substantially horizontal planes. rlhe nose l is of tubular form and may have any desired cross sectional outline but preferably has a transversely elliptical cross sec-1 of the wings 2 is also continued directly up to the flanges 4" to'A which the strands are joined by portions 6 twisted into'V substantiallyvver-tical planes and disposed vat the outer sides of said flanges. By reference to FigA ure 3 it will be noted that the outer edges of the strands of eachr wing lie in a plane indicated by the line X which is Vlocated well bej-` hind a parallel plane indicated by the line Y touching the adjacent side of the nose 1, that 1- the plane of the flange 4 forms a continua# tion of the plane of the inner yedges of the strands to which said flange is joined, and that the common plane of the axes of the strands of each wing, as indicated by Ithe line plane of the corresponding iiange 4. n

In the preferred construction, afs shown in Figures 1, 2 and 3,'the strands of the opposite Wings have their corresponding ends extended in the saine direction, that is to say, with reference to the drawing, the ends adjacent the nose extended downward and the ends adjacent the flanges 4 extended upward; andas thus formed the strands of one wing are staggered with relation to the strands of the other wing. These features of forni and arrangement permit an advantageous nesting of the ends of the strands adjacent the. nose, as best shown in Figure 3 ;y thus it will be seen that the i inner ends of the strands of one wing over-lie the inner ends of the strandsl of the other .wing and that the twisted portions 'connect with or join the rear side of the nose at or very close toa line `longitudinal-ly central of such rear side. l

Figure l3 shows the `corner 4beadin usewfith its flanges '4 Vsecured by nails or otli'erw'vise suitably 'to the wall W t'owhich the layer of finishing plaster P has 'been applied; lt will' be noted thatv (due to the relation ofthe strands tothe noseof the bead) apiaster layer j "of substantial thickness 'at allpoiiits lies 'at the vouter side of each wing whereby liability of cracking 'riiininiizech that the flanges 4 `are available forlining lip tlrefbe'ad regardless viding a full monolithic corner reinforced byV expanded metall and having an exposed continuous metal edge.

The corner bead having the features above described may be economically produced by the method exemplified schematically in Figures 4 toll inclusive. The b'ank with which the operation is start-edis illustrated in Figures '4 and 5 and consists of a vrectangular strip of suitable extent which is formed with two rows of diagonal slits Sivan iinperforate portionl intermediate vthe rows of slits and iniperforate edge portions 4a at the outer sides of the rows of slits. Inthe finished product the material between the slits 3a provides vthe strands 3, the intermediate iinperforate kportion la provides the nose l and the outer imperforate portions 4a yprov-ide the yfl-angesrl.

Inr Figure 5 the slits 3a of one row are shown as extending oppositely and in staggered relation to the slits of the other row, thereby toV provide for the staggered relation of the f strands of one wing to the strands of the other wing and for theextension of the corresponding ends of the strands of the two wings in the same-direction, as shown in Figures 2 and 3 and as above described.

The first steps in the production ofthe bead are the bending of the edge portions 4at at right angles to the strand bearing portion and at the same side of the planeof the blank, assho'wn in Figure' 6 and the bending of the f strand bear-ing portions at right angles to the intermediate imperforate lport-ion 1i1 and at the same side thereof but in a direction such that the portions 4a and laproject at opposite sides froni'the strand bearing portions. VAs a I result of these bending operations the blank has the cross sectional form illustrated by full lines in Figure 7, that is vto say it has a channelled cross section with the portions 4a projecting-laterally outward from the strand bearing portions which form the sides of the channel. Y

Y' The blankhaving",` thus been brought into the forni shoivn in Figure 7 is next brought-to the form shown in Figure 8f. l This is accomy.ci

plished by bendingand expanding movements f which are simultaneously performed. In the bending movements the Vstrand bearing portions are brought back into -a common plane while thefportiens @are Vheld through-out in tion, the portion 1a being relatively moved in directionY opposite tothe direction yof movement of the portions 4a and the directions 'oi these movementsbeing *oppositev to the direcftionsinwhich tlieslits 3i extend. Thus, refferringtov Figure 5, .the slits 3a are shown as .extending upward to the `portions la and ydownward to the `portion 1a and in the expanding planar movements of theseportions the 'portions l? are moved downward and the d portionla is moved upward as shown by the ,In aug) 1 arrows in Figures 9 andlO. The above menkitioneld relative planar movement of the portion-lopposite tothe planar movement kof the portions 4a may consist either of an absoflute opposite movement of tlieportion 1a or it f vthe slits 3 arelgradually or progressively ftui'ned into planes at corresponding angles to the lcommon plane with which the operation started and are lalso gradually or pro- Y pressively `brought into substantially perpen- "dicularrelation tothe portions la and 4 between which they extend, so that when the ri'noveinents described are completed, as shown 'finf'Figure 8, thewebs of material between the' slits 3a occupy parallelplanes at substantial right anglesto their original common plane land have their Vlongitudinal axes atsubstan- 'tial'j right' angles to the` longitudinal axes of kfthe portionslafand Lla'which in turn lie at opposite sides Iof the webs, that is to say the portioi'ila'fis'co-planar with tlie'commonplane Vof the edges of the webs at one side of the expanded blank and the portions la are co- L 'planai-Withf the vedgesvof the webs attlie opposite side of the expanded blank. Figures 9 and l() considered 'comparatively exvvemplifyithe changein the rrelations of the l.' 'Fil Webs vbetween'the slits. AFigure 9 assumes a stage'afte'r the movements have commenced but prior to the completed'stage which is `-sli`own-b'ylFigure10; Figure-9-shows the Webs as d lying in parallel planes extending obliqu'elyto the parallel ,planes of the portions laand 'lla and as extendingalong axes which form'il'ess than right angles withlthe `'longitudinal axesof theinipeiforate portionsbut approach nearer in degree to right anglesY than 'the angles which obtained when the operation was started", Figure 10 showsthe lWebs as lying in parallel planes Vdisposed claiiii:-. f i ,f n .K i.

k1. A: corneribead having an apicalinose at vright angles tothe common planes l of the Aimper'foratei portions and 7as extending along yfaxes `at'right angles to the longitudinal: axes vofthe,imperforateportions:y It .will be' notedy vthat asfthe bending and expanding movements progress the strand bearing portions are gradually increased in yWidth as will appear from the several stages indicated by Vbroken lines in Figure Tand also by a comparison of Figures 9 and `10 and that, as

shown. in these later figures, the voids between the' webs progressively increase in area and progressively approach rectangular outlines as delimited by the webs and the imvperforate portions'.

The final step in the production of the corner bead involves the change of the foiin of the expanded blank as shown in Figure 8 whereby to provide the nose 1 and the wings 2 of the completed corner bead as shown by Figure 11 in Whichthe webs between the slits 3 constitute the strands 3. The nose 1 is provided by the intermediate portion 1a ywhich is deformed in any suitable manner, as b rollin@ from its straio'ht cross sectionas shown in Figure 8 to its tubular cross section as shown in Figure 1l. `The conversion vof theexpan'ded blank into the form ,of the .completedcorner beadis effected solely by andfincidentally to the formation of the nose 1,thatis .to say as the: nose is formed the expanded portions are bent at angles to one another, each expanded portion maintaining the same relation to the adjacent imperforate ledge portions 4a which it had in the expanded' blank prior to the formation of the nose.

lVhen the nose has been completely formed the expanded portions have the angular relation by which the corner bead is adapted for 4use in the manner described. rFigures 12,13 and 14 relate to a construction in which the strands ofthe tivo Wings have their adjacent end 4portions yo'ppositely directed and the ends adjacent the nose are not nested as in the previous embodiment. Figure 12 shows the blank for the modified foim,this blank differing fromthe blank of 'Figure 5 in'that the slits 3" of both rows extend in the samedirections. The procedure is the same `as inv ther preceding embodiment except that in effecting the expansion of the slitted portions the imperforate edge portions, lieredesignated 3b, have their planar `movements iniopposite directions and the imperforate intermediate portion, here designated 1b, is held stationary, that is to say against planar movement. The expanded blank; has the form shown in Figure 13 and fis transformed into. the completed corner bead as shown in Figure 4latinl the same way as in the previous embodiment, that is to say -by and incidentallyto the formation ofthe nose from they intermediate imperforate portion 1b. n i, y c

Having fully ,described my invention, I

and Wings connected to the rear side of said Y a planary termina-1V portionto which said strands are connected at their ends remote fromV said nose, the nose adjoining and projecting from the outer Vedges of the strands and the planar terminal portions adjoining r and projecting from the inner edges of the --ystrands, the strands of one Wing being staggered relatively to the strands of thel other Wing and adjacent the nose the ends of the strands of they tWo Wings being arranged in overlying relation.

In testimony whereof I aHX my signature. HARVEY M. GERSMAN.

CERTIFICATE or coRREcrIoN.

Patent No. 1,748,284. Granted February 2s, 1930, to

HARVEY M. GERSMAN.

It is hereby certified that the name of the assignee in the above numbered patent was erroneously written and printed as "Kalnian Steel Company, Inc. whereas said name should have been written and printed as "Kalman Steel Company, Inc.", as shown by the records of assignments in this office; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 15th day of April, A. D. 1930.

M. J. Moore, (Seal) l Acting Commissioner of Patents.

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