Patent GB-190711790-A (GB)
Title: Improvements in and relating to Apparatus for Molding Plastic Materials
Inventor: BEESON ARTHUR WADE
Filed: 1907-05-21
Granted: 1907-09-26
Abstract: 11,790. Beeson, A. W., and Henning, G. W. May 21. Moulding screw-threads.-Relates to apparatus for moulding external screwthreads on the necks of bottles, jars, and other articles formed from plastic material, of the type in which an internally-threaded ring is lowered on to a mould containing plastic material which is forced into the ring by a plunger, the ring being afterwards turned and raised simultaneously by suitable mechanism so as to be screwed off the moulded article, leaving a continuous thread. The application to the manufacture of glass articles is described. The moulding-ring 21, provided with an internal screw-thread 20, is attached to a sleeve 23 working in a screwed collar 25 secured to a plate 26 attached to a standard 2. The sleeve 23 also carries a pinion 24 adapted to gear with a train of wheels 30, 32, 33, Fig. 5, of which the wheel 33 is mounted on a shaft 34 which is intermittently rotated in opposite directions. As the sleeve 23 rotates, it is also raised or lowered owing to the screwed collar 25, the thread 28 of which is of the same pitch as the thread 20. The shaft 34 is rotated by means of a twoway clutch 42 adapted to engage with either of two pinions 35, 36 which are continuously rotated in opposite direcby a bevel - pinion 37 rotated by a motor 38. The shaft 34 is raised or lowered to engage with either of the pinions 35, 36 against the action of springs 102, 103 by means of a plate 13 carried by a hollow piston-rod 10 attached to a piston 11 working in a cylinder. In operation, a mould 4 carried by a rotating table 3 is brought under the mould ring 21 which is then lowered by forcing down the piston 11. Plungers 7, 17 are next forced into the mould to shape the article, and after their withdrawal the piston 11 is raised, causing the mould ring 21 to be screwed off the moulded article. To prevent the sleeve 23 and mould ring 21 from being screwed up or down too far, suitable brakes or stop mechanisms are provided. A pinion 60, Figs. 4 and 5, gearing with the wheel 30 rotates a short shaft 61, which is screwed at its upper end 62 and passes through a screwed collar 63. The shaft also carries a block 64 provided with cams 65, 66 adapted to engage with braking-surfaces 67, 68 which are rigidly backed by means of an adjustable wedge block 70 attached to the plate 13. The sleeve 23 is also prevented from screwing down too far by means of projections 48, 49 on the wheels 32, 33. The clutch 42 is automatically disconnected from the pinions 35, 36 when the mould ring 21 has been sufficiently rotated by means of an eccentric pin 82 acting on either of two stop-rings 83, 84 carried by the shaft 34. The shaft 81 carrying the pin 82 is operated by means of a spring 100 acting on a crank 94. Surrounding the shaft 81 is a hollow shaft 80 carrying a worm-wheel 79 which is operated by the shaft 34 through gearing 75, 76, and a worm 78. The shaft 80 carries a disk 91, Figs. 2, 7, and 8, having a cut-away portion adapted to receive a pin 95 attached to the crank 94. The rotation of the disk 91 is such that when the sleeve 23 has been sufficiently rotated the disk passes from the position shown in Fig. 7 to that shown in Fig. 8, carrying the crank 94 just over the centre line c-c ; in this position the crank is further rotated by the spring 100, as shown in dotted lines, bringing the pin 82 up against the stop-ring 83 and disengaging the clutch 42. When the shaft 34 is rotated in the opposite direction, the operation is reversed. The mould ring 21 is detachably secured to the sleeve 23 by means of pins engaging with a flange 105, Fig. 10, and may be removed by turning it until the cut-away portions 107 come against the pins. The mould ring is normally held from rotating independently of the sleeve 23 by means of a pin 109, Fig. 9, pressed into a groove 110 by a spring 111 ; this pin is pushed out of the groove 110 by means of a suitable tool when the ring 21 is to be removed.