GB313821A - A new or improved method of and apparatus for drawing sheet glass - Google Patents

Abstract

313,821. Haddan, P., (Virginia Plate Glass Corporation). Sept. 24, 1928. Drawing.-Relates to apparatus for drawing sheet glass and to means for applying an outward pull to the edges of the sheet in order to maintain its width. According to the invention, the apparatus comprises an elongated drawing-pot having pockets or recesses formed in its upper sides at both ends and extending outwards beyond the drawing-points or corners of the pot, and a bait bar of such a length that its end rests in the recesses when it is lowered on to the pot at the commencement of a draw. The pot may be a separate receptacle or it may be connected by a passage 6, Fig. 2, with a tank furnace 7, so that molten glass flows constantly into the pot and is kept with its surface approximately level with the upper edge of the pot. The end walls 8 are rounded and are provided with vertical guiding-grooves 9. Pockets 10 are formed in the end walls in communication with the grooves 9, and these pockets, which are filled with glass when the. pot is in use, receive the ends of a bait bar 12, Fig. 1, when it is lowered. The bait is preferably constructed with a slot in its underside. and means are provided whereby air may be withdrawn from its interior in order to draw the glass into the slot. When a draw is being made, the edge of the glass sheet 13, Fig. 4, will be formed in the grooves 9 and the sheet will draw off the upper corners 11. Because the bait is larger than the distance between the corners 11, the edges of the sheet are pulled outwards and the tendency of the sheet to become narrower as the draw proceeds is counteracted.