GB258127A - Improvements in or relating to the manufacture of blown glassware - Google Patents

Abstract

258,127. Jackson, W. J. Mellersh-, (Hartford-Empire Co.). Nov. 23, 1925. Blowing; delivering molten metal. - A method of making blown glassware consists in allowing molten glass to issue from an aperture in a receptacle, and in blowing the glass while it is issuing and before it is detached from the body of glans in the receptacle. The form of apparatus shown in Figs. 1 and 3 comprises a forehearth 4 having a discharge aperture 6. a hollow and vertically movable plunger 2 having its lower end submerged in molten glass 3, and a blowpipe 7 which extends through the plunger 2 and is connected at its upper end to a source of vacuum or air pressure. In the position shown in Fig. 1, the plunger 2 is at the top of its stroke, the blowpipe 7 is raised above the aperture 6, and the glass is beginning to issue from the aperture. A slight leakage of air into the blowpipe causes a hollow 9 to be formed in the issuing glass. Downward movement of the plunger forms a gather of glass below the aperture, and air blown through the pipe 7 enlarges the space 9 and forms the gather into a bubble. After the bubble has been allowed to elongate, a mould 8, Fig. 3, is closed around it and it is blown to fill the mould. The mould and the pipe 7 are next separated, and blowing is continued to burst-off the glass between the mould and the pipe. If the glass does not burst, it may be cleaned off by a tool passed over the mould, and the hardened neck of glass may be severed by shears from the mass in the forehearth. Finally, a burner is brought into position to reheat the stub end of glass projecting from the aperture 6. In some cases, the plunger 2 may be omitted, the reciprocation of the pipe 7 being sufficient to control the formation of the gather. Shaping articles after formation.-If the neck of the formed article, in this case a bottle, is to be finished, the mould is moved to a new position where a neck-former 20, Fig. 8, is closed on the upper end of the mould and a ring burner 22 is brought into position to reheat the rough projecting edge of the glass. When the glass is soft, the burner is removed and a forming-tool 21 is lowered and co-operates with the former 20 to finish the neck of the bottle. A rotary shaping-tool or other suitable device may be used instead of the formers 20, 21. The method and apparatus may also be used for the production of electric lamp bulbs.