Patent GB-357124-A (GB)
Title: Glass forming machines
IPC: C03B9/22
Filed: 1930-05-05
Abstract: 357,124. Machines for making glassware. KINKER, C. C., 2090, Auburn Avenue, Toledo, Ohio, U.S.A. May 5, 1930, No. 13811. [Class 56.] Relates to a glass-blowing machine, of the kind described in Specification 315,154, [Class 56, Glass], in which charges of glass are gathered by suction and the moulds are carried by two tables geared together so that they rotate in unison with one another. According to the invention, the tables rotate continuously and the parison and ring moulds are carried by supports which rock about horizontal axes, the rocking being controlled by cams which allow the moulds to dip when a charge of glass is to be gathered. The parison moulds open before they reach the line which connects the axes of the two tables, and the finishing moulds close as they approach this line, in order to transfer the parisons from one set of moulds to the other. Gathering molten metal.-The machine gathers charges of glass from a forehearth 2, Fig. 1, projecting from a tank furnace 1. The forehearth is covered with a shield 6 of refractory metal, polished on its underside, which reflects the heat of the glass downwards and mimmizes chilling. An opening 10 is left through which the charges of glass are gathered. Blowing.-The machine, shown in plan in Figs. 1 and 3, comprises a table 11 mounted on rollers 13 and carrying two columns 14, 15 on which are mounted two gear rings 23, 24, respectively, that engage one another and are driven by a motor 16. The ring 23 carries the parison moulds and ring moulds, and the ring 24 carries the finishing moulds. The parison moulds and ring moulds are attached to supports 27, Figs. 10 and 19, which are pivoted on horizontal shafts 26 carried by a spider 25 which is secured to the gear ring 23. A stem 44 depending from each support carries a roller 64 which engages a fixed cam 67 mounted on the column 14. The cam is so shaped that the parison mould dips into the molten glass when passing over the opening 10 of the forehearth 2. The roller 64 has a bearing 65 which is eccentrically mounted on the stem 44 and can be turned to regulate the extent to which the mould dips into the glass. Shearing.-The support 27 carries an horizontal arm 61, mounted on a vertical pivot, which has at its outer end a blade 63 for cutting through the glass that trails from the parison mould after a gather has been made. The blade also serves as a baffle-plate for closing the bottom of the mould. The blade arm 61 is pivoted to a sleeve 73 rotatably mounted on the stem 44, and is swung vertically by an arm 41 having a roller 42 which engages a cam fixed to the stem 44. The sleeve 73 is turned on the stem 44 by a roller engaging a fixed cam close to the cam 67. Movement of the sleeve 73 causes the shear blade to swing across the bottom of the parison mould, and springs are provided to ensure a resilient contact between the blade and the mould. The support 27 also carries vertical pins on which the halves 31 of the parison mould and of the ring mould are pivoted. The moulds are opened and closed by fixed cams. Another fixed cam 153 operates a lever 114 which raises and lowers a mandrel 109 for co-operating with the ring mould to form the mouth of a bottle. The lever 114 also operates a plunger 155 which enters between the halves of the ring mould and causes them to open. The spindle 26 of the support 27 is hollow and communicates with the interior of a chamber 108 which contains the mandrel 109. It also communicates by way of pipes 97, 98, 99 with a vacuum tank or a source of compressed air, so that suction or blowing air can be applied to the space around the mandrel above the ring mould. In operation, the parison moulds are dipped successively into the forehearth, and suction is applied through the pipes 97, 98, 99 to the ring mould to draw charges of glass into the moulds. After a parison mould is raised out of the forehearth, the shearing blade is moved under the mould to cut off the trailing glass and also to act as the mould bottom while the gathered glass is expanded in the mould by compressed air applied above the ring mould. The mould blade is then removed and the mould opens as it approaches the line joining the axes of the two columns 14, 15. At this point, the parison mould is completely open and the parison suspended from the ring mould is almost enclosed by one of the finishing moulds 162 which are mounted on a table 160 secured to the gear ring 24. The ring mould opens and releases the parison, a mould bottom 187 is swung upwards by a cam 188, the finishing mould is completely closed, and the parison is then blown by air supplied by a blowhead 180 which is swung downwards on to the mould.