Patent GB-715166-A (GB)
Title: Improvements in or relating to glassware forming mechanism
IPC: C03B9/193
Filed: 1952-05-15
Abstract: 715,166. Glass manufacture. EMHART MANUFACTURING ,CO. May 15, 1952 [Nov. 30, 1951], No. 12318/52. Class 56 A machine, for making hollow glass articles is convertible so that the parison may be cavitated by a pressing plunger, if the ultimate article is to be wide-mouthed, or by blow means, if the article is to be narrow necked. The conversion is effected by the positioning either of pressing means, Fig. 2, or blow means, Fig. 3 on a unit 2, Fig. 1, a securing screw 82 being used in either case. The unit 2 comprises a cylinder in which is a piston 15 responsive to air pressure from lines 50, 51, the piston rod 16 being bored to receive a supply tube 18 for air which is used either for cooling the pressing plunger 26, Fig. 2, or for blowing the parison cavity as described below with reference to Fig. 3. The height of the unit 2 is adjusted by a shaft 14, which gears with an internally screwed bevel 10. When desired, the unit, Fig. 2 without the pressing plunger 26, is inserted on the unit 2, the plunger 26 is screwed on to the end 28 of the rod 16 which is suitably raised, the solid thimble 34, embraced by the two halves of the conventional neck ring 46, is placed over the plunger and the -neck ring is embraced by the two halves of the usual parison mould 47. The unit, Fig. 2 comprises a cylinder 29 flanged at 29a for seating upon the unit 2, and for accommodating a stop screw 44 and air passages 75a, 76. A sleeve 35 is slidable on the cylinder 29 and is kept raised against the stop 44 by a spring 41. An arm 36 projects from the sleeve through a slot 37 in the cylinder 39 to encircle the rod 16 and support a cylindrical spacer 40. When air is admitted to the top of the piston 15, the plunger 26, as it reaches the end of its stroke, depresses the spacer 40 and compresses the spring 41. When the: air exhaust opens, the spring 41 raises the plunger 26 to its loading position which is determined by the stop 44. Upward movement of the piston 15 moves the plunger to its pressing position as shown in Fig. 2. The air system comprises cam-operated valves 54, 59, 61, 80, the valve 54 being connected with a spool valve 69 whereby, when the plunger 26' is making its working stroke, the cooling air supplied to passages in the plunger by the valve 61 and tube 18, passes from the plunger into the cylinder 29 and is exhausted by being connected, via pipe 64 and valve 69, with a vacuum pipe 70. As the plunger 26 is withdrawn from the parison, the cavity is prevented from collapsing by air supplied by valve 80 through passages 79, 74...78. The blow means, Fig. 3, comprises a shell 83 having a flange 83a<SP>1</SP> which is secured on the upper end of the unit 2, within which the shell 83 is received. The shell 83 has a stepped bore within which slides a correspondingly stepped piston 86, a spring 87 tending to keep the piston raised. A thimble 91 is attached to the piston 86, with slight vertical play, by a bayonet connection 92, a bush 93 being pressed upwardly by a spring 94, against the thimble 91. A pin 95 projects into a vertical slot in the bush 93 and limits the vertical movements thereof. A neck pin 99, slidable within the thimble 91, is coupled to an adapter 97, which screws upon the rod 16, by a split coupling ring 105 which embraces the flanges 103, 104 of the parts 99, 97 and is slidable in the bush 93 and thimble 91. A bush 106 seals the junction between the pin 99 and adapter 97, and is pressed upwardly by a spring 108 which bears on a diametral pin 109. The thimble 91 is guided by a ring 114 which is held in grooves in the halves of the neck ring 102, the latter being held by the closed halves of the parison mould 116. The neck pin 99 is lowered, against the spring pressure, by admission of air; under the control of the previously described valves &c. from the passage 75 to the' passage 117. The three way valve 66 is turned counterclockwise through a right angle, from the Fig. 1 position, to connect the vacuum pipe 70, when. the spool valve 69 allows, with the pipe 64. The glass charge is settled in the neck ring by vacuum applied to.a groove 119 and recesses 119a, through a passage 118 in the thimble 91, and to a groove 127 in the neck pin through a passage 126, both passages 118, 126 communicating with a space 121 above the piston 86 which is connected by ports 120, 122 and a space 124 between the shell 93 and the unit 2, to the vacuum pipe 64. Counterblow air is supplied from the pipe 20 to the tube 18 so that, when the neck pin is retracted, and the vacuum port closed in consequence, the air passes through a passage or passages 130 in the neck pin to the cavity formed thereby. Specifications 257,637, [Class 56], 560,672 and 668,983 are referred to.