Patent GB-391558-A (GB)
Title: Improvements in or relating to the manufacture of hollow glassware
IPC: C03B9/24
Filed: 1932-01-29
Abstract: 391,558. Glass manufacture. JACKSON, L. MELLERSH-, 28, Southampton Buildings, London.-(Hartford-Empire Co. ; 333, Homestead Avenue, Hartford, Connecticut, U.S.A.) Jan. 29, 1932, No. 2753. [Class 56.] A method of making hollow glassware consists in filling an open-bottomed mould with molten glass, expelling part of the glass from the mould, severing the expelled glass from that which remains in the mould, and then completing an article from the remaining glass. The method can be carried out by gathering glass by suction into a parison mould M, Fig. 1, with which is associated a ring mould N, a suction and blowing head H, and a neck pin P. After the mould has been filled and raised from the bath of molten glass, air pressure is admitted to the cavity formed by the neck pin, and the core of the glass is blown out of the mould, as shown in Fig. 2, so that a bubble protrudes from the lower end of the mould. The glass is then severed immediately below the mould by a blade S which also forms a thin film of glass that closes the lower end of the parison. After the blade S is withdrawn, the glass in the parison walls continues for a short time to flow downwards and thus thickens the film at the bottom. The parison is then transferred to a finishing mould and is blown to its final shape. In a modification, shown in Fig. 8, the glass is expelled only to a predetermined extent by a measured quantity of air, and sufficient blass b is left in the mould to form the bottom of the parison. The method may be carried out also by means of a machine fed by an automatic feeder, an inverted parison mould PJ, Fig. 15, being filled with glass by the action of a plunger PL. When the mould is filled, the core of glass is expelled by upward blowing through the ring mould N<2> aided by the retractive movement of the plunger. The neck of glass is severed between the mould and the feeder outlet, and the article is given its final shape in the mould or in a separate finishing mould. The parison mould may also be inverted, after it has been filled with glass, either from a feeder or from a punty, and the core of glass expelled as before, the surplus glass being received in a suitable receptacle. A machine which gathers glass by suction is shown in Fig. 25. The molten glass is contained in an open forehearth 40, and an island 41 is arranged in the forehearth to form a U-shaped channel through which the glass may be circulated by an impeller 42 of the type described in Specification 330,706, [Class 56, Glass]. The parison mould M, and the associated ring mould and neck pin, are carried by a bracket 46 secured to a vertical column 47. The column is reciprocated vertically and is also oscillated about its axis by cams 54, 58 respectively, and the parison mould is opened and closed by an air motor 63. Timing mechanism T<1> for controlling the operation of the mould unit is mounted in the bracket 46. After the mould M has been charged and the excess glass expelled, the column 47 swings about its axis through a right-angle, and the mould is opened. The parison, left suspended from the ring mould, is enclosed by a finishing mould (not shown) and is blown to its final shape. Timing mechanism of the type described in Specification 257,637, [Class 56, Glass], is used to control the sequence of the different operations. Specification 2470/04, [Class 56, Glass], also is referred to.