Patent GB-191126222-A (GB)
Title: Improvements in or relating to the Manufacture of Blown Glass Articles.
Inventor: KADOW AUGUST
IPC: C03B9/22
Filed: 1911-11-23
Granted: 1912-11-25
Abstract: 26,222. Kadow, A. Nov. 23. Blowing; gathering molten metal; shearing. - Relates to a machine for making electriclamp bulbs &c., of the type in which the moulds &c. are carried on a rotating frame and the metal is automatically gathered from a tank. In the machine described, six complete sets of moulds &c. are provided, each of which goes through the same cycle of operations in succession. Fig. 1 shows the general arrangement of the machine, and the remaining Figures show in detail the operations through which the glass passes. The main frame 15 is rotated continuously by a motor 86 about a stationary central column 18, 19, to which are fixed the cams controlling most of the operations. Each blank mould 166 is mounted on the end of, an inclined slide 108 which is projected into the furnace 106 once in each revolution, so that the blank mould dips into the metal in a ring 107 and sucks up a charge as usual, Fig. 132. The slide 108 is then retracted and a knife 209. Figs. 132 and 133, cuts off the excess of metal which drops just outside the ring 107. While the slide 108 is projected into the furnace its rotary movement is arrested, but as soon as it is clear of the furnace again it is swung forward with increased velocity so as to regain its normal position with respect to the uniformly rotating frame 15, with which it continues to move until it arrives at the furnace again. The blank mould, when first retracted, stops over the upturned end of a neck mould 242, 248, Fig. 134, mounted on a turn-over bracket 235, and drops the solid blank 243 into the open jaws of the neck mould, which close upon it, Fig. 135. A plunger 250 pierces the blank in the ordinary way. Meanwhile, the blank mould is further retracted and brought to rest over a nozzle 433, Fig. 1, from which cold air is blown upon it. A small puff of air is blown into the blank so as to expand it slightly, Fig. 136, and is then immediately allowed to escape, thus causing the blank to collapse partly, Fig. 137. This is repeated several times, the bulb being gradually expanded, Fig. 138, and the neck mould is then inverted, as shown in Fig. 139 and on the left of Fig. 1, and swung in a vertical plane to elongate the blank, Fig. 139. A finishing- mould 370, Fig. 141, is then closed round the blank which is then rotated and blown as usual. Before the finishing-mould is opened, the high-pressure blowing air is allowed to escape and air at a low pressure, about 5 oz. per sq in., is admitted. This prevents the further expansion or the collapse of the blank should it be still soft. The finishing-moulds are dipped in a tank 415, Fig. 1, as usual. The slide 108 is operated by a cam 27 which rotates six times as fast as the frame 15. The working parts are generally moved into operative position by springs and withdrawn by the various cams. In this way, should any obstruction occur, the spring affected remains compressed without causing breakage, whereas, if the cam were used to effect this movement, breakage would be probable.