Patent GB-283890-A (GB)
IPC: H01J9/46
Filed: 1928-01-13
Abstract: 283,890. General Electric Co., Ltd., (Assignees of Patent-Treuhand-Ges. fiir Elektrische Gl³hlampen). Jan. 19, 1929, [Convention date]. Filaments, supports for; attaching; residual gases.- Comprises a machine wherein the supporting wires of lamp mounts are fused into the pedestal rods, and rotatable coiling-heads are adapted to form eyes on the ends of the wires by coiling them around the spiral filament, which is thereby mounted on the wires. The successive operations are performed at positions A - - Q, Fig. 1, traversed by the pedestals while mounted in holders 5 spaced around, and vertically slidable in, an intermittently rotated table 4. At position A the pedestals are fed manually or automatically from an adjacent annealing apparatus to the holders 5. At position B the pedestals 6, Fig. 3, are lowered to bring the leading-in wires 9 into position in a guillotine comprising a fixed cutter 23, and a sliding cutter 12 which is forked to accommodate the arbor rod 8 of the pedestal in a central slot. Another slider 14 mounted on and connected to the cutter 12 by a spring 15 bends the wires 9 to shape against an anvil 16 before they are cut to length. At positions C and D the ends of the rods are softened so that in position E a bead can be formed and the filamentsupporting wires inserted therein by the usual mechanism. The bead is cooled in positions F and G. At position. H a rotatable table 34 is provided carrying devices to feed the spiral filaments to the pedestals and attach them to the leading-in wires 9. An operator lays a filament 45 loosely around an anvil 42, Fig. 7, with its ends resting on projections 44 on a slide 39, as shown in broken lines, and then draws it back to the position shown in full lines. The slide 39 then operates to register the ends of the filament with the leading-in wires 9, as shown in Fig. 9, while jaws 36 close under the action of spring 37 and lay the ends of the filament lightly against the sides of the anvil. Pivoted jaws 56 are then operated to pinch, and, if desired, weld, the filament and leading-in wires together. The next operation, that of coiling the supporting-wires 31 around the filament, is performed at position L. As the pedestal is lowered, an air-jet 92 assists to place the filament 45 over a number of pivoted hooks 90, Fig. 11, which then descend with the pedestal, open out under the action of a cam 89 and springs 88, and lay the filament through longitudinal radial slots 63, Fig. 12, in the coiling-heads 60 into axial positions therein, while the support wires 31 engage the faces of these coilers. A slide 74, Fig. 11, is then operated and, at first, blade springs 81 attached to it ride off wedges 79 and press the wires 31 into notches 83 in the coilers. Then links 73 attached to the slides operate toothed sectors 65 which impart one revolution to the coilers and form closed eyes 93, Fig. 16, on the wires 31, in which the filaments are enclosed. The table supporting the series of coilers is then moved to withdraw the noses 82 of the coilers laterally from the eyes 93 on the wires and so enable the pedestal to be raised. At position N a number of prongs 110 on a pivoted fork 109 engage beneath alternate support wires 31 and bend these upwards, thus imparting a zigzag shape to the filament. At position 0 the lamp mounts are dipped into a tank 111 containing " getter " material, the surplus, of which is blown off the mounts by air-jets 112 at position P. The finished mounts are removed at position Q.