Patent GB-1005720-A (GB)
Title: Machine for moulding glass articles
Inventor: LEEUW GERRIT DE
IPC: C03B11/06
Filed: 1961-09-11
Abstract: A machine for moulding glass articles comprises a mould 2 mounted on a base 1, a single support column 4 upstanding from base 1 and a moulding plunger 23 and mould ring 18 mounted, coaxially with the mould 2, on concentric support means 37, 16 respectively on the column 4 for movement axially of the mould, the plunger 23 and ring 18 each having independent actuating means in the form of a double-acting piston 38, 27 respectively and means for subjecting one or other of the piston <PICT:1005720/C1/1> faces to a pressure fluid whereby the ring 18 can be moved towards and away from the mould 2 over a relatively short distance immediately above the mould 2 and the plunger 23 can be moved into and out of a position, in which it projects into the mould 2 through the ring 18, over a distance great enough to leave, in the raised position, space for the supply of molten glass to the mould 2 between the plunger 23 and the mould ring 18.  A guide block 8 is positioned on column 4 by nuts 6, 7 and by a continuation 9 encircling a guide column 11 secured to column 4 by yokes 12, 13.  The guide block 8 has a bush 15 in a bore 14 in which slides the ring support means, a liner 16, which carries an arm 17 secured to the mould ring 18, a pin 33 on arm 17 sliding in bore 34 in guide block 8 to prevent rotation of the liner 16. Fluid under pressure is supplied through connections 30 or 32 to a short space 26 between liner 16 and bore 14 by which a piston 27 secured to liner 16 is operated to move the ring 18 into or out of engagement with the mould 2.  The plunger 23 is supported on a spindle 37 mounted on a piston 38 sliding in the interior space 36 of the liner 16 between upper and lower ferrules 42, 421. Fluid under pressure is supplied through connections 40 and 50, the duct 50 having a non-return valve 51 and escape passages 41, 47 being provided in ferrule 421 of which the passage 41 is sealed by a ring 3811 on piston 38 so that at the end of the downward movement fluid can only escape through duct 47 through an adjustable stop valve 49 to give a braking action to the plunger 23.  Similar braking action on the upward stroke is provided by a non-return valve 52 in passage 39 and an adjusting screw 54 in channel 53.  A slight lift at the end of the downward stroke may be provided by replacing the stop valve 49 with, combining with the stop valve 49, a pressure fluid supply to duct 47 to allow a measured quantity of fluid to flow back under piston 38.  The mould ring 18 has a centering spigot 20 which engages a chamfered surface 24 leading to the socket 25 of the mould 2 which closely fits the spigot 20.  The plunger 23 closely fits the central aperture 21 of the ring 18 through which it passes to press the glass in mould 2.  The plunger 23 is cooled by air from a blower through the hollow spindle 37 which escapes through passages 64, the air being supplied through a connection 55 and also, during moulding, additional air is supplied through cap 58 and connection 56, the space 57 being connected to the channel in the spindle 37 at the end of the downward stroke.