US1156273A - Means for drawing sheet-glass. - Google Patents

Description

l. W. COLBURN.

v MEANS EUR DRAWING SHEET GLASS.

APPLICATION FLLED AUG- l4. 1908. l

l Patented Oct. 12, 1915.

3 SHEETS-SHEET l.

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I. W. COLBURN.

MEANS FOR DRAWING SHEET GLASS.

APPLICATION FILED AUG.I4, 1908.

Suomi-ton Patented 0@t.'12,'1915.

3 SHEETS-,SHEET 2.

3 F162. f WL? Q Mm.

I. VV. COLBURN.

MEANS FOR DRAWING SHEET GLASS.

APPLICATION FILED AUG14. 1908.

' 1,156,273, 4 Pufented 0@t.12,1915.

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' Umran str-Aras PATENT oFFioE;

IRVING W. COLBURN, F FRANKLIN, PENNSYLVANIA, ASSIGNOR, BYKMESNE ASSIGIL MENTS, TO TOLEDO GLASS COMPANY, 0F TOLEDO, OHIO, .A CORPORATION OF OHIO.

' MEANS ron kDmiwnve SHEET-epass. A l v i 1,156,273. I Specification 0f Letters-Patent- Patented Oct. 12, 1915.

e Application filed August 14, 190s. "seria1mr44a4ss,

To all wwbz t may concern.' v. 7'. on the drive-chains 8 for l advancing it Be 1t known that I, IRVING W. COLBUR'N, from the-reheating chamber 4 to the leer of Franklin, Pennsylvania, have invented this same gripping device serving to pull the a new and useful Improvement in Means for sheet over the bending roll, after the sheet 5 Drawing Sheet-Glass, which improvement has been drawn, that is, after ithas been ,60d i is fully set forth in the following specifformed by tension applied either to por-- lation. l y tions of the drawn sheet or to a bait which, This invention relates to the art of drawas -said sheet or bait rises from the molten ing sheet glass bya continuous process,and mass of glass 1 in the drawing chamber, I more particularly to that class of glass-comdraws up other molecules of the moltenmass 65 monly known as figured or cathedral glass,v into sheet form. It is thisformation of the the characteristic \of which is a iigured, sheet by drawing it out of the molten ma'ss stippled or rough surface. that is technically known in the art as The leading characteristics vof the invendrawing. The sheet having been drawn tion relate more especiallv to the means by is advanced into a portion of the open at- 70 which the surface of the glass is given the mosphere below theentrance to the reheatdesired configuration, and also to a novel. ing chamber 4, and by reasoof its exposure method of maintaining the width of the .to this open atmosphere, it rapidly cools and sheet. hardens, and it is therefore necessary, in Other specific 'matters 'of improvement order that' the sheet may be bent from its 75 will be hereinafter referred to and then parvvertical to its horizontal position, that it be ticularly pointed out in the claims. v reheated, and thereby softened or rendered The inventive idea involved is capable of more plastic, i'n order that-the bending aca variety of mechanical expressions, onev of tion over the bending roll 3 may take place which, for the purpose of illustrating the without danger of breaking the glass. Care 80 invention, is shown in the accompanying must be taken, however, at this point not to drawings, in which-` reheat the 'glass to such a degree of temper-l Figure l is a sectional perspective view ature that it will be softened sufficiently for of the working end of the machine showing the bending roll 3 to have any modifying the workingchamber for the molten glass, -efect thereon. For the purpose of effecting 8 5 the combined figuring and width-maintainthis reheating, burners 8', 8, are inserted ing device, and the front end of the reheatthrough openings in the front wall` D of the ing chamber Where the glass is reheated bemachine, preferably delivering a blast of fore it is passed over the bending roll from flame against the mufile 10, as shown in a vertical to a horizontal position to be Fig.l. As here shown, there is interposed 90 passed through the annealing leer; F ig` 2'is between the carrier table 5v and the bending a side elevation of the front end of the maroll an idler roll v11 whose upper surface chine, showing the means for driving the is slightly above that of the bending roll 3 combined figuring and width-maintainingand of lthe carrier table 5. I f preferred,

l rolls, a portion of the driving device being however, the bending roll 3 may be placed 95 broken away to expose other portions to with its upper surface in a slightly higher view; and Figs. 3 and 4 are broken details.l plane than that of the carrier Itable 5 and Referring to the several sheets of the the intermediate roll 11 omitted. e

drawings, in which like numerals indicate All the revolving parts thus far described like parts, 1 is .the molten glass in any suitl by preference 'are mounted upon hollow 100y able 'working chamber, and 2 is .the 'cover shafts for the purpose of-circulating a coolportion thereof through which there isa ing iiu'id therethrough to obviate the deletransverse opening. e terious effect lof the'heat incident ,to the 3 is the bending roll located inthe front operation of the machine.

or forward end of the reheatin'g chamber 4, Located'in close proximity to the surface 105 and 5 is the carrier table which receives the of the molten glass 1 1n the workmg chamber sheet 6 after it has been bent fromV the V'erare two rolls 12, 12, mounted parallel t0 tical to the 'horizontal position over the"`\V and in close ,proximity to each other in yieldbending roll 3, the sheet .being grasped beiiigfbearings, such for example, as that -5 tween the endless carrier table and the bars shown"a t v 13 in Fig. 2, where the bearing 110 boxes for the twoy rolls i@ '12, are shown as yieldingly held pressed toward each other by springs 14, 141, acted upon by set screws 15, 15 in a manner that rwill bewell understood; The two rolls are spaced the desired distance apart by means of set screws lipassing through a lug 1T on one bearing box` and reacting against a lug 18 on the other bearing box. v

Referring to Figs. 2 and l. 19 is a shaft driven by suitable connecting' gearing' from thermain power shaft of the machine, and connected by a universal lioint 2O to the sha'ft 21, turningl in bearings 22 mounted on Aand rigid with the bearing box 22% of one of the rolls 12. Shaft 21 has a miter gear 24 meshing with 'a corresponding miter gear onthe shaft of one of the rolls 12. there being a spur gear rigid on the shaft of :said roll and gearing with a like spur wheel 27 on theshaft of the other roll 12. The teeth of the spur gears 2G and 27 are somewhatk prolonged, so that even though the two rolls 12, 12, are somewhat separated, Athe `teeth Yo" the said wheels 26, will never theless mesh, and thetwo rllsoe thereby simultaneously driven through the operation of the' shaft, but in reverse directions, with A, their adjacent faces moving upward and outward. The faces or' these rolls 12, 12,

are figured, as shown in Figs. 3 and 4. with the reverse of the pattern or stipple that it is desired to impressfupon the face ot the rolled sheet. The rolls 12 and the shafts therefor are hollow, and means are provided forf circulating water therethrough. rPhe water maybe either taken in-at one end ot the shaft on one side ci? the machine and permitted jto flow out at the other end. as indicated in Fig. 4, or any other vpreferred construction may be employed. By mount ing these rolls 12, 12, in close proximity to the surface of the molten glass 1 in the working chamber they serve not only to igurethe glass in the desired manner.` but they also perform an important part of the drawing operation proper, that is, of lilt ing the molten glass insheet form from ,the molten mass 1, and they also serve to counteract the tendency which drawn sheets of glass have to rapidly narrow to'a string or thread as the drawing operation proceeds. l

Preferably, the rolls 12, 12 are driven a speed about one per cent. less than. the motion` of the carrier table 5 and the grip bars 7 whereby a certain longitudinal stretching action is imparted to the sheet between the point in the heating chamber where the sheet is grasped by thegrip bars 7 and the rolls 12, 12, in the working chamber. H desired, the rolls 12, in .addition to the roughened or gured surface, may be provided ateach end thereof adjacent to the end of .said ronghened surltgtee, withannular (langes 3., fill (see Fig, 3). As the sheet ot glass drawn upward by the rolls,

1 these llanges Vcontact' .with cacl'r other as shownin Figs. and 5 and thus serve to determine the minimum thickness of the drawn sheet.

ltwill be nnderstoodthat the surface of the molten mass y1 in the working chamber mis supplied with heat from any suitable source to maintain it in proper working condition, and ifor the purpose oli' still further n tempering the glass and securing the precise yworking condition desired. l may. and some` times do suspend on each side oi the liguring rolls 12, 12, hollow shields 33. 33, through which any suitable cooling fluid. as water, is circulated, entrance to said shields for the water being through the pipes 3l, 34,

the water linding exit through correspond-- ing pipes at the opposite end.

Operation: The molten glass 1 in the working chamber haring been brought to proper working condition. the formation ofkk the sheet 1s .initiatedfin the usual way by inserting asuitable bait into the mass of -niolten glass` which, when the adheres thereto, is slowly elevated between the rolls 12, 12, which yield in their bearings for this purpose, the sheet of glass being Yformed yas the result of the molecules of glass in the molten mass .following the. bait as it is thus' elevation olf the bait, howereigliits the drawn sheet through the space between the rolls andtl'ieopenin v 36 in the bottom of the eating chamber and upward into said chandler and over the benilii'ig; roll 3, the idler roll 11, and, between the carrier table i3 and the gip bars 'i'. The partcula r arrangementacilitating this operation of the lA ait has been fully described in my prior of the pre-sent invention need not `be here oweit upon in detail, The sheet having been "drawn," is materially chilled or reduced 1n temperature as it passes through the open atniosphere between the rolls'12, 12,and the 3 mouth 3G ofthe reheating ychamber -,lbuty as it enters said chamber it is subjected to the action ofA 'the heat from' burners 8', 8', and is reheated or softened to just 'that degree where it can be bent over thebendinlg roll 3 withoutbreaking, without, however, be

made upon the face of the .sheet`I 'ino made sott Ienough rtocause the bending eration of the by the rolls 12, 12. During the elevation of the sheet from the rolls l2 to the mouth 36 of the reheating chamber the drawn sheet is not only subjected to the cooling iniuence oi the external atmosphere, but 'vvill also be more or less cooled by reason of the cooling influence lof the Water-cooled shields 33, 33, though liche cooling action of such shields is not essential to the successful opi machine. The narrowing' tendency of; the sheet occurs betvveen the bite of the rolls l2, l2, npon the sheet and the surface oi' the molten mass l, and by reason of the hbid which the roughened surface of said rolls has upon the drawn sheet,4 this narrowing tendency is entirely overcome, and Without in'iparting any lateral stretching actionvv to the sheet. lVhen the sheet ot glass is dravvn in the machine as described. there isy no lateral stretching action of the sheet Whatever. and in fact no stretching action lateral or iongitudinal. except wher is preferred to drive the rolls l2, 12, slightly slower than the corresponding movement of the carrier table 5 and the grip bars 7. The drawn sheet having been cooled between the shields 33, Bf. and bv reason of exposure to the external atnmsphere, advanced into the reheating chamber l, and reheated by the lnrners 8', 8. then bent over the bending roll 8, and received upon the carrier table 5, here it seized by the grip bars 7 reacting againet said tabie. and advanced into and thri'mgh any suitable leer, Where the ;rlass is gradually cooled and thereby nealed.

it will be understood that the skilled mechanic would be capable of enibodying the inventive idea set forth in the above desi'i-ilied machineI in a` variety of iorn'is: that variations may be made in the proportions, and in some cases in the relative arrangenfent ol' the parts, and also in some Cases somo ol' the partf's'may be omitted, without departing' from the spirit of my invention, uhich invention is as broad as the claims hereinafter appended.

l. In a machine for drawing figured sheet glass from a mass of molten glass, apair of sheet-drawing and sheet-figuring rolls lo- -ated at the sheet-forming point and in contact with the sheet from edge to edge, and means for driving` said rolls.

2. In a machine ior drawing figured sheet glass 'from a mass ot molten glass. a pair of sheet-drawing vvidth-maintaining sheet-fig`- uring rolls located at the sheet-forming point and in contact with the sheet from edge to edge, and means for driving said l'ollS.

glass 'from a mass of molten glass, apair of ligar .l drawing rolls extending across and contacting with the sheet from edge to edge at the sheet-forming point, and means for driving said rolls, whereby the sheet is sinmltaneously drawn. figured, and widthmaintained by the single pair of rolls.

4. in glass-drawing apparatus, the combination of a receptacle for containing a mass of molten glass, a pair of oppositely s. .in a machine for drawing figured sheet disposed parallel width-maintaining rolls extending transversely across said receptacle, yielding bearings for the shafts of said rolls, gearing connecting` said rolls, and a drive shaft operatively connected to the .eliat't of one of said rolls, said drive Shaft turning in a bearing movable in unison with the bearing oi' one ot said rolls.

lin testimony whereof I have signed this specification in the presence ot' two subscribing witnesses.

7 lunvvaan lt. lNMivN.

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