Patent GB-629242-A (GB)
Title: A method and a machine for the production of drinking glasses and similar glass articles
IPC: C03B9/33
Filed: 1945-12-04
Abstract: 629,242. Glass manufacture. SOC. MECANIQUE VERRIERE. Dec. 4, 1945, No. 32824. Convention date, May 19, 1944. [Class 56] [Also in Groups XXIV and XXIX] In forming a drinking glass &c. in which the cup, leg and foot comprise one single weldless part, an inverted parison is first formed in a mould whose upper part, conforming to the foot and leg, is connected to suction while air is blown into its lower part; the parison is then reverted and its cavitied part enclosed in a finishing mould leaving the leg and foot exposed, and during blowing therein the glass is alternatingly rotated about its axis. The process is carried out in a machine resembling that described in Specification 611,735, each unit thereof being mounted on arms 19, 14, 7, 43, 31 (Fig. 1) secured to a fixed upright 2. With the lower part of the parison mould closed about, and the punch 52 projecting into, the ring mould 36, a gob of glass is delivered through the spout 21; motors 15 and 20 then close the upper part 4 of the parison mould for the foot or other projection and lower the plug 16. A motor 63 fixed to the arm 43 moves to the right, Fig. 6, to withdraw its rod 62 from the end of a spring-loaded bar 54 carried on the body 40 of the transfer device and having an extension similar to that referred to in the above-mentioned Specification, but inclined downwards, whereby the punch 52 is withdrawn; compressed air to blow the parison is then supplied (through a duct 68 in a disc 69 fixed to the arm 43, a spring-loaded gunmetal bush 70 and a pipe 67) to a sleeve 39 carrying the ring mould 36, while suction to ensure penetration of the glass throughout the mould 4 is applied to grooves 11 therein, this sleeve 39, to smooth the parison surface, being simultaneously rotated in alternating directions by reciprocation of a fixed motor 47 engaging by means of a side fork a half collar 50 on one of a pair of racks 46 (Figs. 1 and 6) carried by the transfer device and meshing with gears 44 on the sleeves 39. On formation of the parison, motors 8, 15, 20 open moulds 3 and 4 and lift the plug 16, motor 73, Fig. 6, through a rack 71, gear 74 and clutch 76 (see Group XXIV), turns the transfer device through half a revolution, and the parison is brought into position to be received by the finishing mould 28 (Fig. 1). Motor 35 lifts the latter, together with a foot supporting table 122, and motor 32 closes it; compressed air supplied through a duct 68a, Fig. 6, blows the article to its final shape while the ring mould is again alternatingly rotated to smooth the surface by a second motor (not shown) arranged beside the motor 47, and whose side fork now engages the half collar 50 of the appropriate rack. The finishing mould 28 is now opened and lowered, tongs 83 are raised by the motor 89 from the position shown in Fig. 1, and are rotated by rollers 91 on the shaft 87 engaging slots 92 in a fixed sleeve 93, to a position to be closed, by a motor (not shown) mounted on the arm 86, about the neck of the glass just below the ring mould 36. A wedge 65, Fig. 6, driven by a motor 66 now opens the mould 36 against the action of springs 64, Fig. 1, and motor 89 lowers the tongs to deliver the glass onto a table 94 or onto a conveyer. The wedge 65 is withdrawn, the transfer device is rotated through a further half revolution, and the mould 3 (having just released another parison carried by the second ring mould 39) is now closed about the empty ring mould, while the punch 52 is lifted by the motor 63 in readiness for the reception of another gob of glass. Cams, similar to those described in the Specification referred to above, operate valves of a different form (see Group XXIX), and are driven through a variable speed gear comprising a roller on the shaft of an electro-motor mounted for adjustment radially to a disc frictionally engaged by the roller. The Specification as open to inspection under Sect. 91 comprises also a modification in which the foot, etc., is formed at the finishing stage by providing suction grooves in the lower portion of the finishing mould, and an adaptation of the machine is also referred to wherein tumblers (without feet), with or without facets, etc., over a portion of their heights may be produced in a finishing mould having a part with a spur ring whereby it may be rotated by a reciprocating rack to smooth the glass; the tumbler may be stripped from the rotatable mould part by dividing the latter diametrically, or by lowering it vertically without division, and the tumbler bottom may be supported on a head on the top of a rod projecting vertically through the mould bottom. This subject-matter does not appear in the Specification as accepted.