US1424155A - Manufacture of sheet glass - Google Patents

Description

H. F. CLARK.

MANUFACTURE OF SHEET GLASS. APPLICATION FILED AUGn5. 1919. RENEWED DEC. 26. I921.

Patented Aug. 1, 1922.

HENRY F. CLARK, 01F BELLE VERNON, PENNSYLVANIA, ASSIGNOR T0 WINDOW GLASS JERSEY.

amas.

Application filed August 5, 1919, Serial No. $15,426. Renewed. December 26, 1921.

To all whom it may concern:

Be it known that I, HENRY F. CLARK, a citizen of the United States, residing at Belle Vernon, in the county of Fayette and State of Pennsylvania, have invented a new and useful Improvement in the Manufacture of Sheet Glass, of Which the following is a full, clear, and exact description, reference be ng bad to the accompanying drawing, forming part of this specification, in which Figure 1 is alongitudinal vertical section of a portion of a glass drawing apparatus, partly conventional.

Figure 2 is a plan view of the hot air distributor, and

Figure 3 is a plan view of a modified form of hot air distributor.

My invention has relation to the manufacture of sheet glass, and more particularly tothat method of manufacture known as sheet drawing in which the glass, instead of being drawn in cylinder form and subsequentl split and flattened into sheets, is initial y drawn in sheet form.

In such method, one of the difficultles which has been encountered and which has made it difiicult to produce commercial glass of the higher grades, in quantities, is the pimpled or roll-marked character of the surface of the glass when it contacts with the roll or rolls used in the drawing apparatus. My invention is designed to overcome this difiiculty and to enable the production of sheet glass which is largely if not wholly free from objectionable pimpling and '-which will equal in quality the glass made by cylinder drawing methods.-

Herein, I have illustrated my invention ,as applied-to that form of sheet drawing in which the continuous sheet is first drawn from the glass bath in a vertical direction and isthen bent horizontally over a bending roller and carried through an anneallng chamber or lehr; but it will be understood that it may be equally used in connection with other methods of sheet drawing in which the difliculty above noted is encountered. Also that various changes may be made in the form and arrangement of the apparatus employed, without departing from the spirit and scope of my invention as defined in the claims.

In the accompanying drawing, the numeral 2 designates a portion of an usual receptacle containing the glass ath from Specification of Letters Patent.

MANUFACTURE OF SHEET GLASS.

Patented Aug. 11, 192%. Serial No. 524=,fi14.

which the sheets are to be drawn and 3 a bending roller over which-the vertically rising sheet. is bent in a horizoiital direction and is carried by suitable gripping aparatus into an annealing chamber 4.

rawing apparatus of the character here partially. and conventionally illustrated forms in itself no part of my present inventlon, and as it is well known in the art, need not herein be more specifically illustrated and described.

In accordance with my invention, I provide means for heating and softening the under surface of the glass sheet immediately after such surface passes out of contact with the bending roll, and at a time when the temperature of the sheet is below that of v plasticity. The action of such means is substantially a fire-flashing which is sufiicient to fuse, or partially fuse, the immediate surface of the sheet to an extent which will obliterate the objectionable pimpling of such surface. This fire-flashing can be accomplished either by air preheated to. the necessary temperature and directed against the surface of the glass or by gas or oil fumes directed against such surface. In the drawing I- have illustrated a distributor 5 for preheated air or gas. This is placed transversely of the glass sheet at its underside and is formed either with a continuous jet opening 6, or a Iplurality of staggered jet openings 7 (see ig. 3) through which the heated fluid is directed into contact with the under surface of the glass sheet 8. Shortly, back of the flashing jet, I may employ a coolin jet 9 to solidify the softened surface, when ound necessary.

My invention provides simple tive method and means capable of being'applied to and used in connection with existing drawing apparatus at a relatively small cost, whereby the quality of the drawn glass can be greatly improved. The action of the flashing jet, by softening the surface portion only 'of the glass, removes the marks or pimples caused b the rolls and gives the surface a good pollsh. My invention may be used in connection with other known means "for minimizing the difficulty above re and effecnot i 6 heated jet, Substantially as described.

2. The method of drawing glass sheets, consisting in drawing a continuous sheet upwardly from a molten glass bath, bending it over a bending device and moving it in a- .generally horizontal direction, and subject ing the unde'rsurface in'its horizontally extending portion to the action of a heated jet followed'by that of a cooling jet, substantially as described. I

3. In the drawing of glass sheets,'the improvement which consists in drawing a continuous sheet; over the surface of a roll, and immediately thereafter subjecting the rollcontacting surface of the sheet to the action of'a heated jet, substantially as described. 4. In the drawing of-glass sheets, the improvementv which consists in drawing a continuous sheet over the surface of a roll, and immediately thereafter subjecting the rollcontacting surface of the sheet to the action ofa heated jet followed by thatof a cooling jet, substantially as described.

5. The method .of drawing glass sheets,-

.consisting in drawing a continuous sheet upwardly from a molten glass bath, bending it j over a bending deviceand moving it in a generally-horizontal direction. fire flashing applying the under-surface of the sheet immediately after it passes the bending device, and then a cooling jet toits under surface, substantially as described.

6. In the drawing of glass sheets, the improvement which consists in drawing a continuoussheet vertically from a glass bath, bending the sheet over a" roll onto a horizontal path, and causing the roll-contacted surface of thesheet to then pass in contact with a fire-flashing jetand then in contact with a cooling jet, substantially as described. 7. In apparatus for drawing glass sheets from a molten bath, a bending device, means for drawing a continuous sheet upwardly in a vertical direction and thence over a bendin-g device in a generally horizontal direction, and means for fire flashing the under side of the sheet after it device, substantially as described.

' 8. In apparatus for drawing glass sheets from a molten bath, a bending device, means for drawing a continuous sheetupwardly in.

a vertical direction and thenceover a bending device in a ener'ally horizontal direction, means for re flashing the under side of the sheet after it passes the bending device, and means for cooling the fire flash surface, substantially as described.

In testimony whereof, I have hereunto set in hand. y HENRY F. CLARK.

passes the bending

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