Patent GB-426275-A (GB)
Title: An improved glass forming machine
IPC: C03B9/22
Filed: 1934-01-31
Abstract: 426,275. Glass manufacture. McNISH, A. F., 1, Priory Place, Craigie, Perth. Jan. 31, 1934, No. 30316/33. [Class 56] A forming - machine of the suction - gathering type has two parison moulds mounted on an horizontal table whichisoscillatedthrough part of a circle in order to carry a mould from the gathering position to a transfer position, and vice versa. The finishing moulds are mounted on one or two tables which oscillate in unison with the parison mould table. The machine comprises a base plate 1 which is carried at one end on a bearing 8, and is supported at the other end by a roller 12 which rests on the floor near the gathering trough 13 of a furnace. The base plate is oscillated about the bearing 8 by a hydraulic or a pneumatic cylinder to allow the parison moulds 23 to gather at a different position from that at which the glass is sheared, and to follow the glass as it flows through the trough B. The parison moulds 23 are carried by a table 4, and the finishing moulds 15 either by one or by two tables 5 rotatably mounted on the base plate 1. The tables are geared together and are oscillated by means of a rack which is reciprocated by hydraulic or pneumatic cylinders 48 fixed to the base 1. The table 4 oscillates through an angle of 180‹ when only one table 5 is used, but through a lesser angle when two of the tables 5 are used. The finishing moulds 15 are opened and closed by cylinders 18, 19, and the finished articles are removed from the moulds by means of take-off devices 38, of any suitable type, operated by a cam 43 secured to a fixed central post 34. The parison moulds 23 are pivoted on sleeves 21 which slide on vertical rods 33 and are provided at their lower ends with rollers which run on fixed horizontal tracks on the table 1. At the gathering and transfer positions, however, the tracks are interrupted and the rollers rest on the upper ends of the piston rods of hydraulic or pneumatic cylinders 10, 11 secured to the base plate. The parison moulds are opened and closed by cylinders 29. The ring moulds and blowheads 24 are carried by units 25 attached to brackets 26 which slide on the rods 33 and are counterbalanced by springs 27. The halves of the ring moulds slide in horizontal guides in the units 25, and they may be adjusted vertically by means of hand wheels 45 on screwed shafts 44. The mould halves are opened and closed by cylinders 53. In operation, when the mould tables come to rest, the parison mould in position II is lowered by the cylinder 11 until it dips into the molten glass in the trough B, the machine being swung about its pivot 8 while the mould is dipped into the glass. Suction is applied in the usual way through the ring mould 24 to gather a charge of glass. When the parison mould is filled, it is lifted by the cylinder 11, and a shear blade is swung by a cylinder 47 across the bottom of the mould to cut off the trailing glass, premature operation of the shears being prevented by means of vertically slidable rods. After the shearing operation, the table 4 is oscillated to carry the mould to the transfer position I, and during this movement, a bottom plate is moved beneath the mould to cover the cavity, and the parison is counterblown in the usual manner. When the mould comes to rest in position I, it opens and is then lowered by the cylinder 10 in order to carry the parison down into the open finishing mould 15. The finishing mould closes, and the parison is blown to its final form. Thus one parison is blown to shape on a finishing mould while glass for the succeeding parison is being gathered. The ring mould now opens and together with the parison mould is raised by the cylinder 10, and the table oscillates. During this movement, the finished article is cooling in the mould 15. During the next movement of the tables, the finishing mould opens and the finished article is removed by the take-off device 38. The operation of the two sets of co-operating moulds may be timed independently of one another, so that articles of two different sizes may be made at the same time.