Patent GB-451343-A (GB)
Title: Improvements in machines for the manufacture of glass bottles
IPC: C03B9/20
Filed: 1934-11-30
Abstract: 451,343. Glass manufacture. MITCHELL, W. B., Holmfield, Cross Banks, Shipley, Yorkshire. Nov. 30, 1934, No. 34369. [Class 56] A bottle-making machine of the suctiongathering type has parison moulds and ring moulds the halves of which move, when opening and closing, in vertical planes, and they are operated by toggle levers which allow a certain amount of lateral movement to the moulds such that the locking-action is not disturbed by adjustments that may be necessary to secure registration of the mould parts. The machine comprises a number of mould units mounted on a table which rotates continuously about a vertical column. The ring mould 23, Fig. 2, and parison mould 4 of each unit are carried by arms 26, 21 respectively, which are swung in a vertical plane, to open and close the moulds, by levers 9, 10 secured to horizontal shafts a, b respectively, journalled in a member 8. This member slides vertically on a head which, in turn, slides between vertical guides secured to the table of the machine. The sliding head is lowered when a charge of glass is being gathered and when a parison is being transferred to a finishing mould, and the member 8 can be adjusted on the head to enable the ring mould to be adjusted relatively to the finishing mould. The levers 9, 10 are coupled to the mould halves by means of links 20, 20b with ball-and-socket joints, and they are also connected by links to other levers which are rocked by cams fixed to the central column of the machine. The shafts a, b are allowed a slight longitudinal movement in their bearings, so that the locking action of the toggle joints formed by the levers 9, 10 and the links 20, 20b is not disturbed should adjustment of the moulds in a horizontal direction be necessary. The halves 23 of the ring mould are supported by yokes 25, Fig. 6, provided with pins g which enter retaining holes in the mould halves. Each yoke has a spindle 25b by which it is pivoted in the end of the mould arm 26. Similarly, each half of a parison mould 4 is formed with a flange 4w which is supported by a yoke 21b, similar to the yoke 25, by which it is pivoted on the end of the mould arm 21. The flange 4w rests on projections 21y on the yoke, and it is also formed with an opening which engages a retaining pin 21v on the yoke. The looseness between the moulds and their arms allows the mould halves to fit tightly in contact with one another when closed. The mould arms 21, 26 are pivoted on blocks 31, 32 which are slidably mounted in a bearing 30 secured to the member 8. Springs 35, 36 keep the blocks 31, 32 in proper position in the bearing 30 and also, by yielding, ensure tight contact between the ring and parison moulds when the moulds are closed. For this purpose, the parison mould flanges 4w have inclined portions 4b which lift the ring mould slightly as the parison mould closes, so that the springs force the two moulds into tight contact. Application of suction and compression to the interior of the ring mould is controlled by a double valve attached to the rod 48, Fig. 8, which operates the mouth-forming mandrel 47. The valve comprises two seatings 43, 44 which make contact with shoulders 43a, 44a in the valve casing. Compressed air is admitted to the space below the valve through a port 46, and another port 45, in the space between the two valves, is connected to the vacuum tank. Thus when the mandrel 47 is in the ring mould, suction is applied to the space within the ring and parison moulds and. the valve 44 closes the upper end of the space. When the mandrel is raised, as shown, the valve 43 interrupts the application of suction and pressure air is blown in through the port 46.