Patent GB-259965-A (GB)
Title: Improvement in glass fabricating machines
IPC: C03B9/16
Filed: 1926-10-12
Abstract: 259,965. Miller Inc., W. J., (Assignees of Miller, W. J.). Oct. 16, 1925, [Convention date]. Blowing. - Relates to a blowing- machine of the turnover-parison type in which sets of moulds are carried by a table the rotation of which may be continuous or intermittent. The invention consists chiefly is arranging the moulds so that they can be mounted on, or detached from, the machine table as assembled units. The mould table consists of a hollow hub 6, Fig. 2, which rotates about a hollow column 2 and is formed with a number of hollow arms 8, Fig. 3. The pipes for conveying compressed air to the moulds are led through the hollow arms 8, and air for cooling the moulds passes through the spaces in the arms. Each set of moulds, with their operating-gear, is carried by a structure consisting of an upper frame 9 and a lower frame 10 which are bolted together. The whole structure, with the moulds completely assembled, can be lifted on to a pair of table arms 8, and when placed in position, ports in the mould structure register with corresponding ports in the arms 8 to which the air supply pipes are connected. The halves of the parison mould are clamped to holders 36, Fig. 2, hinged on a pin 38 and opened and closed by a sliding plate 26. The plate is operated by a fixed cam and is connected with the mould holders by a spring dog 31, Fig. 3, which yields if the mould resists movement and thus prevents damage to the machine. The pin 38 is eccentrically mounted, as shown in Fig. 2, and may be turned to adapt it for variations in the length of the hinge members. The holders 36 are hollow, and cooling air passes from the interior of the arms 8 through the holders and is blown on to the mould parts and hinge members. The lower end of the mould closes around the ring mould 79 which is carried by a transfer arm 53 secured to a shaft 54. This shaft is oscillated by a rack 59 which reciprocates vertically and is operated by fixed cams. The oscillation of the shaft 54 turns the parison over and transfers it from the parison mould to the finishing mould. Compressing charge into moulds.-In order to compact a charge of metal into the parison and ring moulds, suction is applied through the ring mould and compressed air through a mould cover which is brought down on to the open end of the parison mould. The mould cover is carried by an arm 86, Fig. 3, which is reciprocated vertically, and is swung to one side when raised in order to clear the parison as it turns over. The plug 122, for forming the initial opening in the parison, is moved up and down by a rod 121, Fig. 2, operated by a fixed cam 126. After a charge is compacted, the plug 122 is lowered and air is supplied through the ring mould to blow up the charge to fill the parison mould. The rod 121 slides through a sleeve 119 which acts as a pivot for the finishing-mould holders. The halves of the finishing mould are carried by holders 141 which are hinged on the sleeve 119 and are opened and closed by a sliding yoke 150 operated by fixed cams 155. The yoke also operates parallel sliding rods 158 which open the ring mould when it is in position on the finishing mould. When the ring mould has been turned over and the finishing mould has closed around the parison, the ring mould is opened and releases the parison, and is then swung back under the parison mould to receive a new charge of metal. While the new parison is being formed, a blowhead 178, Fig. 3, descends on the finishing mould and completes the blowing of the first parison, so that one parison is being blown while another is being formed. The bottom plate 163, Fig. 2, of the finishing mould is hinged to its support and is raised to the mould by a fixed cam 177. The cam allows the bottom to tilt, when the mould opens, to discharge the finished article. The connection between all the moving parts and the cam rolls that operate them is made by spring dogs which yield if the movement is resisted. Specification 156,569 is referred to.