Patent GB-241180-A (GB)
Title: Improvements in or relating to machines for manufacturing hollow glass bodies
IPC: C03B9/29
Filed: 1925-09-25
Abstract: 241,180. Naamlooze Vennootschap Internationaal Octrooibureau. Oct. 8,1924, [Convention date]. Blowing.-An automatic machine for blowing glassware, particularly electric lamp bulbs, comprises a pressing- plunger and a press mould for forming the parisons, a finishing mould, and a number of ring or head moulds for conveying the parisons from the press mould to the finishing mould. Means are provided for reheating the parisons after they have been formed by pressing, for turning the parisons while they are being blown in the blowing-mould, and for burning off the finished bulbs from the surplus glass by which they are supported by the ring moulds. The machine comprises a central vertical column 36 to which a table 24 is secured, four ring moulds 30 being mounted on the table in such a manner that they are rotated at appropriate times. The column 36 is rotated intermittently so that each ring mould is carried in turn to one of four operating stations. At the first station a mould 57, which is cooled by the circulation of water through a jacket 64, is raised into contact with the underside of the ring mould. A charge of metal from a feeder is guided into the mould by means of a shoot 55 and a funnel 74 which form the upper part of the ring mould. A plunger 102 then descends and presses the metal in the mould to form a parison. The mould is next lowered and puffs of air, supplied by a cylinder 133, Fig. 4, enters the parison through channels in the side of the pressing-plunger and blow it partly. The ring mould rotates and a burner 142 is swung into position so that its flames play upon, and re-heat, the rotating parison. The plunger rises out of the parison mould and the table 24 is moved to convey the parison to the next station, the burner swinging out of the way as the table moves. At this station the parison mould is enclosed by the two halves 201, 202 of the blowing mould, which is constructed and operated as described in Specification 238,872. The mould halves are cooled bv water circulated through channels in their body, and the paste with which their inner surface is coated is moistened by water sprayed from nozzles 234. Air for blowing the bulb is supplied by a cylinder 178, Fig. 4, and is applied by a blowhead 173, Fig. 1, which is lowered into the upper part of the ring mould. After the blowing is completed, the head 173 is raised and the table 24 moves to convey the bulb to the next station where it is detached from the " lost head " or neck of glass which is held by the ring mould. For this purpose, a burner 236, Fig. 2, is lowered through the ring mould into the interior of the bulb and directs a sharp flame against the inner wall of the neck. As the bulb rotates, the glass is fused along a narrow circumferential zone. During this operation, the bulb is supported by a seat 263, and when the fusion of the glass is completed, the bulb is detached and is ejected from the machine by a forked lever 278. The movement of the table carries the ring mould beneath a plunger 292, Fig. 1, which descends into the ring mould and detaches the " lost head " of glass, the parts of the mould having been opened. The operations of the different parts of the machine are controlled by cam tracks on a rotating drum 4.