Patent GB-374840-A (GB)
Title: Improvements in glass blowing machine
IPC: C03B9/22
Filed: 1931-02-03
Abstract: 374,840. Glass manufacture. MORTON, W. A., 107, 6th Street, Pittsburg, U.S.A. Feb. 3, 1931, No. 3478. Convention date, Feb. 3, 1930. [Class 56.] A glassblowing machine of the suction-gathering type comprises a rotary carriage on which a series of moulds are mounted, and the finishing moulds are carried by arms which swing in an horizontal plane. A finishing mould is moved outwards to receive a parison from the ring mould, and is then moved inwards to the blowing position. The parison moulds need not be dipped when gathering a charge of glass, and successive moulds may be arranged to produce parisons of different lengths. The parison moulds .37, Fig. 1, are carried by spiders 15, 18 which are connected to one another by uprights and rotate continuously about a vertical column 14. Each mould is pivoted on a casting 27 which is supported by a vertical screw 26 mounted in a bracket 25 secured to the spider 15. By means of the screws 26, the castings can be adjusted to suit moulds of various heights. With this construction, the moulds are not dipped when gathering molten glass, charging-fingers 131 being used to lift the glass into contact with the moulds. When a mould is to be dipped to make a gather, as usual in this type of machine, the screw 26 forms the piston-rod of an air cylinder which raises and lowers the mould. A mandrel 40, for forming the initial opening in the parison, is mounted on the piston-rod of an air cylinder 42 and is moved in and out of the ring mould 36 by the application of air and suction to the cylinder. A distributing- head 46 controls the application of air pressure and vacuum to the mould units, and a valve 56 on each unit controls the application to the parison mould. The parison and ring moulds are opened and closed by a stationary cam. The finishing moulds 110 are carried by arms 111, also shown in plan in Fig. 18, which are pivoted on vertical spindles 112 and are swung in an horizontal plane by a rack 114 operated by a fixed cam 115. Each mould is opened and closed by a lever 121 which is pivoted on the spindle 112 and is operated by a fixed cam 116 that alternately engages rollers 117, 118 carried by the lever 121. In operation, the moulds 110 are moved outwards to receive the parisons from the ring moulds, and they are then moved back to their inward position. The moulds now move in a circle of smaller radius than that of the parison moulds, and the finished article is discharged from the moulds at a speed considerably less than the speed of the parison moulds. Also, when a. parison is transferred to a finishing mould, the seam which has been formed on it by the parison mould is at right-angles to the plane of the joints of the finishing mould. The seam disappears as the parison is blown up to its finished shape. The blowhead 145, Fig. 3, through which air is supplied to blow the parisons to shape in the finishing moulds, forms the piston of an air cylinder 143 by which it is raised and lowered. The lower end of the blowhead is chamfered and fits on to a chamfered portion 147 formed on the top of the mould and thus locks the mould.