Patent GB-1061575-A (GB)
Title: Improvements in or relating to the manufacture of articles of glassware
Inventor: WENDLE EDWARD FRANCIS
IPC: C03B9/24
Filed: 1964-06-12
Abstract: <PICT:1061575/C1/1> In a method of forming a parison for a narrow-neck glass article, molten glass is loaded into the open end of a particle blank mould, partible neck mould and plunger assembly arranged co-operatively to define a parison cavity, the plunger being narrow and elongated in shape and extending through the neck mould and being centred in the neck and blank moulds to at least a position below the shoulder of the parison, <PICT:1061575/C1/2> vacuum is applied into the neck end of the cavity to fill the cavity with glass around the plunger thereby to form the parison, the plunger then being withdrawn and the blank mould opened to transfer the finished narrow neck parison to the final blow mould. In an embodiment for use with an Owens Machine the parison is formed by closing together the blank mould sections 14 and neck mould sections 13, lowering into the cavity defined and centring therein a narrow elongated plunger 22, dipping the mould assembly into a glass pool and applying vacuum to suck glass into the mould cavity around the plunger. The excess glass is cut off and the vacuum shut off, the plunger then being retracted and the black mould halves opened to allow for reheat prior to transfer of the finished parison to the blow mould.  The plunger 22 is supported for movement by a cover member 23 which in its lowest position seats over a chamber 24 defined above the neck moulds 13. The actual vertical movement of the plunger is effected by an arcuate gear 30 with rack 27. The tapered plunger 22 is hollow and has a cooling tube 35 (Fig. 2, not shown) inside to define a uniform annular passage 46 for a cooling fluid, e.g. compressed air, to cool the plunger.  This permits of easy removal of the plunger from the parison.  Cooling air enters through a passage 48 in the member 23 and exhausts through passages 50.  Vacuum is supplied to the mould cavity through a conduit 51 connected to an annular chamber 52 which is in communication with the neck mould 13 via slots 57 and the blank mould via a spacing 58 when the plunger is finally seated and grooves 59 along the mould seams.  The rack mechanism which operates to remove the plunger from the finished parison simultaneously moves a blow slide 65 into place over the chamber 24 to blow out the parison in the blow mould.  In an alternative embodiment described with relation to a Hartford Empire I.S. Machine a gob of glass is dropped through an opening 84 of an inverted parison mould 81, 82, the glass being sucked by vacuum into the mould around a plunger 89 and into the neck mould 87.  The narrow elongated plunger 89 is similar in construction to the plunger 22.  It is operated by a pair of fluid-operated cylinders 93 and 96, cylinder 93 operating a thimble 90 to close against the neck mould 87, and cylinder 96 to allow for individual movement of the plunger 89.  As the glass gob is being fed into the blank mould vacuum is applied through conduit 109 connecting with passages 103. When the parison has formed the vacuum is shut off, the plunger withdrawn downwardly and the black mould halves opened.  The parison is then reverted and transferred to the blow mould.