Method and apparatus for manufacturing beaded filament-coil components for electric lamps
阅读：709发布：2021-06-18
专利汇可以提供Method and apparatus for manufacturing beaded filament-coil components for electric lamps专利检索，专利查询，专利分析的服务。并且The ends of helically-coiled lamp filaments are provided with integral nodules or beads of fused metal which prevent the finished coils from tangling when handled en masse. The beads are formed by mechanically cutting the mandrel-coil composite (stock wire) into segments of uniform length, feeding the segments into a notched circular conveyor means, and indexing the conveyor means relative to a pair of stationary torches so that the flames from the latter melt the ends of the stock wire segments in situ and form the desired nodules of molten metal which then solidify. The unmelted portions of the mandrel are subsequently chemically dissolved from the stock wire segments in the usual fashion thus providing hollow filament coils of refractory wire that have a fused metal bead at each end.，下面是Method and apparatus for manufacturing beaded filament-coil components for electric lamps专利的具体信息内容。
1. In the manufacture of helically-coiled filaments for electric lamps or the like, the method of providing a terminus at each end of the finished filament coils which inhibits the tendency of such coils to interlock with one another and become entangled when handled en masse, which method comprises; winding a refractory metal wire on a mandrel of dissimilar metal and thereby forming a continuous composite stock wire, indexing said continuous stock wire to a cutting station and mechanically serving the stock wire thereat into segments of predetermined length, subjecting only the cut ends of the stock wire segments to a high-temperature torch in synchronized sequence with the indexing of said stock wire to said cutting station and thereby melting said ends in situ and forming nodules of molten metal thereat which contain an alloy of the metals which comprise said mandrel and refractory wire winding and are integral with and located at the respective ends of said wire winding, cooling said nodules of molten metal until they solidify, and then chemically removing the unmelted portions of the mandrels from said segments of stock wire so that the ends of the resulting hollow wire coils are terminated by said integral nodules of fused alloy-containing metal.
2. The method of claim 1 wherein the in situ melting of the cut ends of said segments of stock wire is achieved by directing a sharply-defined flame from an oxygen-hydrogen torch onto each of said ends.
3. The method of claim 1 wherein said refractory metal wire is composed of tungsten, said mandrel is composed of iron, and the unmelted portions of the iron mandrel in said segments of stock wire are chemically removed by immersing the segments in hydrochloric acid after the nodules have been formed and solidified.
4. The method of claim 1 wherein the nodules of molten metal are cooled and solidified by contacting the molten metal with a liquid immediately after the nodule-forming operation has been completed.
5. The method of claim 1 wherein; said stock wire is mechanically severed into segments of substantially the same length at said cutting station, and said stock wire segments are arranged in side-by-side relationship and conveyed along an arcuate path past a pair of spaced stationary torches having flames that impinge upon only the cut ends of the segments as the respective segments are moved past said torches.
6. The method of claim 5 wherein; said segments of stock wire are arranged in spaced side-by-side relationship with their cut ends aligned one with the other, said stock wire segments are conveyed along a circular path that is so oriented relative to said pair of torches that a predetermined portion at each end of the respective stock wire segments is melted by the respective torches and thus forms a nodule of predetermined size, and said nodules are cooled and solidified by dropping the hot stock wire segments into a liquid.
7. Apparatus for manufacturing individual embryonic filament-coil components having noduled ends from a continuous stock wire that has been previously formed by winding a refractory metal wire around a mandrel of dissimilar metal, which apparatus comprises; means for holding and indexing the continuous stock wire relative to a cutting station and a conveying means so that the free end of said stock wire is fed into the conveying means and a predetermined portion of the stock wire is disposed at said cutting station, means at said cutting station for mechanically severing the portions of the stock wire that are sequentially positioned at the cutting station by said holding-indexing means, means for actuating said mechanical-severing means and said conveying means in synchronized sequence with the operation of said wire holding-indexing means so that an end segment of predetermined length is severed from the stock wire and is then carried by said conveying means along a predetermined path away from the newly-formed end of the continuous stock wire, and a pair of spaced stationary torches disposed on opposite sides of the path along which severed segments of stock wire are carried by said conveying means, said torches being so oriented relative to said path that the flames from said torches impinge upon and melt the cut ends of said segments thereby forming nodules of molten metal thereat.
8. The apparatus of claim 7 wherein said conveying means comprises; a rotatable carrier that has an arcuate periphery with a series of spaced recesses therein adapted to nestingly accommodate one of said stock wire segments, and means for indexing said carrier in synchronism with said wire holding-indexing means and said mechanical-severing means so that one of said recesses is aligned with and receives the free end of the continuous stock wire when the latter is advanced by said holding-indexing means.
9. The apparatus of claim 8 wherein said mechanical-severing means comprises a stationary cutting blade, a pivotally-mounted nozzle through which the stock wire passes, and means for moving the tip of said nozzle toward and away from said cutting blade so that the portion of the stock wire which is located at the top of said nozzle is forced into severing relationship with said stationary blade by said nozzle.
10. The apparatus of claim 8 wherein; said carrier comprises a circular drum and said recesses comprise a series of parallel-spaced notches in the periphery of said drum, and a stationary guide means is disposed on the side of said drum opposite from said wire holding-indexing means and is arranged to engage the ends of the segments of said stock wire deposited into the respective notches in said drum and maintain said segments in aligned relationship as said drum is rotatively indexed.
11. The apparatus of claim 10 wherein; said guide means comprises a plate-like member that is spaced a predetermined distance from said drum and extends upwardly from the bottom of said drum, and a stationary band-like member is disposed in overlying relationship with the periphery of said drum and arranged to retain the segments of stock wire in their respective notches as said drum is rotated.
12. The apparatus of claim 10 wherein; said drum has a width dimension that is smaller than the length of said stock wire segments, said guide means is spaced from said drum a distance such that substantially equal portions of the respective stock wire segments protrude beyond each side of said drum when said stock wire segments are aligned by said guide means, and a pair of stationary torches are disposed adjacent and on opposite sides of the periphery of said drum with their nozzles directed toward and in line with the protruding end portions of the stock wire segments being conveyed by said drum.
13. The apparatus of claim 12 wherein a stationary segment-retaining means is disposed in overlying sliding relationship with the periphery of said drum and extends around only a predetermined portion of the circumference of said drum such that stock wire segments being conveyed by said drum are free to fall out of said drum after the latter has been indexed through approximately one revolution.
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