US1606276A - Apparatus and method for the production of incandescent lamps - Google Patents

Apparatus and method for the production of incandescent lamps Download PDF

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Publication number
US1606276A
US1606276A US596173A US59617322A US1606276A US 1606276 A US1606276 A US 1606276A US 596173 A US596173 A US 596173A US 59617322 A US59617322 A US 59617322A US 1606276 A US1606276 A US 1606276A
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Prior art keywords
mold
punch
wires
base
claw
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US596173A
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English (en)
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Vello Leopoldo Sanchez
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/16—Joining of caps to vessel
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C03B19/02—Other methods of shaping glass by casting molten glass, e.g. injection moulding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/20—Seals between parts of vessels
    • H01J5/22—Vacuum-tight joints between parts of vessel
    • H01J5/24—Vacuum-tight joints between parts of vessel between insulating parts of vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
    • H01J2893/0037—Solid sealing members other than lamp bases
    • H01J2893/0038—Direct connection between two insulating elements, in particular via glass material
    • H01J2893/0039—Glass-to-glass connection, e.g. by soldering

Definitions

  • incandescent lamp or similar bulb-enclosed electric appliance the body of which, lamp consists of a glass head with leading in wires and contacts embedded therein and adapted for mounting directly in a socket, and a glass bulb fused to said glass head by means of a ring of glass of greater fusibility than either the head or bulb.
  • the present invention relates to lamp heads of the kind aforesaid and has for its primary objects to provide a method of and apparatus for manufacturing such lamp heads with contacts and leading in wires embedded in the glass or similar material of which the head is made, and formed with a screw threaded plug or shank, for mounting in a socket of the Edison type, or formed with a fin or projection for mounting in a bayonet joint socket.
  • the invention consists in a method of producing lamp heads of the kind described, comprising, the steps of positioning contact wires in a mould, introducing molten glass into the'mould in direct contact with the walls thereof and around the wires, inserting a punch into the mould to shape the inner surfaces of the lamp head, and extractingjhe lamp head from the mould.
  • he invention also consists in providing, in apparatus for moulding lamp heads of the kind described, a mould adapted to receive molten glass in direct contact with its wall, a base for said mould, a claw guided in said base for holding the leading in wires of the lamp head during the moulding thereof, a core punch with ducts therein for the leading in wires, means for bringing the mould and core punch into and out of c0- operative relationship with each other, extractor means for removing the finished lamp head from the apparatus, and means for operating the claw and the extractor means.
  • the invention further consists in the several constructions of moulding apparatus hereinafter described.
  • Figure 1 is a longitudinal elevation, partially in section, of an incandescent electric lamp, the head of which is made by means of the moulding machine and has a screwed plug or shank for a socket of the Edisons type, the three elements, namely, globe, head and welding ring, which constitute it being shown separately.
  • Figure 2 is a view in longitudinal section of a head in its moulding position, showing the wire embedded into the glass of the head during the moulding process.
  • Figure 3 is an underside view.
  • Figures 4 and 5 are a transverse section and a plan view, respectively, of the electric contacts of the head.
  • Figures 6 and 7 illustrate in longitudinal section and in plan View the second electric contact.
  • Figures 8 and 9 are general views in elevation and a plan of the moulding machine for making lamp heads with screw plugs or shanks;
  • Figures 10 and 11 illustrate in side View and in underside plan View a punch intended to form the interior of the head
  • Figures 12, 13 and 14 are'sections upon lines 12-12, 1313 and 14-14 of Figure 10;
  • Figures 15' and 16 are, respectively, a front-view-partially in section, and a plan view of the table supporting a die intended to form the external part of the cover.
  • Figure 17 is a section upon line 1717 of Figure 15 I F1gure"17 shows, on an enlarged scale,
  • Figures 18 and 19 are, in side-elevation and plan, detail views of the stationary base piece and showing a claw for holding fast the leading in wire during'the moulding process and extractors.
  • Figures 20 and 21 show, in elevation and plan-view, the claw and the extractors borne by a stationary piece assembled by a dovetail-joint with the base piece.
  • Figure 22 is a vertical section upon line 2222 of Figure 19;
  • FIGS 23 and 24 illustrate the pushing members of the extractors.
  • Figures 25 and26 are plan views of Figures 23 and 24;
  • Figure 27 is a separate view of the.claw which holds the loop of the leading in wire, the two branches of which are to be embedded in the glass of the head;
  • Figure 33 is a plan view of Figure 32.
  • Figures 34 are a front view and an underside view of a modified embodiment of the punch, in which the punch proper is removable and interchangeable.
  • Figure 36 is a further modified embodiment of said unch
  • Figure 36 1s a section upon line 36'-36" of Figure 36;
  • Figures 37 and 38 are a longitudinal section and a plan view of a base piece similar to that of Figures 18 and 19, but arranged so as to form heads locked by means of a bayonet-joint into their sockets.
  • Fig. 39 shows a modification of the die for effecting bayonet joint lamp heads.
  • Figures 40 and 41 illustrate in section and on an enlarged scale detailsof a modified bayonet joint for the lamp head.
  • the moulding machine illustrated generally'in Figures 8 and 9 enables one to obtain a head with screw-threaded shank adapted to fit sockets of the Edisons type; in this case, the head 3 ( Figures 1 to 7) is provided with twometallic contacts 13 and 12 inlaid superficially into the mass itself of the glass, and they have the shape illustrated in Figures 4 and 5 for the contact 12 and in Figures 6, 7 for the contact 13.
  • the contact 13 establishes the electrical connection of the wire 14 with the screw-threaded socket, though the wire 14 be inlaid in the middle of the head, and, for this purpose, the contact 13 is located at the bottom of a groove 49 provided into the head itself, and its curved part 16 follows the outline of the first coil ofthe screw-threading of the head, so that, when the end of the wire 14 is welded, at 17, onto the contact 13, the current may flow from the socket up to the internal part of the lamp by following the path 16, 13, 17 14.
  • the wires 14 and 18 are inlaid hermetically into the glass and pass through the head 3 and its central extension 19, which latter may be provided, in its middle part, with a welded glass-rod 4 intended to serve as a support for the filament.
  • the mould consistsof three parts, viz: the punch 20 ( Figures 10 to 14), the die or spoon 21 ( Figures '15 to 17 and the base 22 ( Figures 18 to 20) together with the extractor 223 (seen separately in Figures 20 and 21) on these figures, the punch 20, as well as 1hdie, are shown open.
  • Figures 8 and 9 illustrate the elevation and the plan view of the moulding press ready for use.
  • the punch 20 is connected to a rod-24 of the press by means of a screw 25 and its lower extension has the shape of a stirrup 26 for the purpose of enabling the manipulations described hereinafter.
  • the lower part, namely the punch body 20, is formed of two arts 26, 27, the latter being pivoted to the ormer at 28; the part 27, in its position of greater opening makes with the other part 26, an angle of about 90.
  • These two parts when closed provide a singlc' punch the lower end of which has a shape appropriate for shaping the inside of the head.
  • Each of the internal surfaces of the two parts forming this punch comprises flutings 29 constituting cylindrical ducts when the two surfaces join each other.
  • the internal faces of each part of the punch have two recesses 30 and 30 which, together constitute a cavity corresponding to the external shape of the central extension 19 of the head, in which extension 19 are embedded the branches 14 and 18 of the leading in wire.
  • the die 21 is also made of two parts which pivot on a hinge 33, and have on their internal faces, depressions corresponding to the external projections of the lamp head.
  • the die 21 embraces the base 22 as well as a stationary piece 34 mounted thereon in which slides the ejector or extractor.
  • the die 21 in each internal face of the two die-parts are hollowed two suitable cavities 35 and 35 ( Figures 15, 16 and 17).
  • the cavity 35 has a depression corresponding to the external outline of the upper end of the base 22, and the cavity 35 has a depression corresponding to the external outline of the piece 34;
  • each die may be provided with a jacket 22 lined, or not, with asbestos, said asbestos being maintained by two small boards screwed upon the jacketing.
  • the stationary piece 34 illustrated as a separate view in Figures 29, 30 and 31 fulfils the following purposes:
  • the base 22 is traversed from top to bottom by three ducts through which pass the rods 43 and 44 of the pushing organs of the extractor and of the claw.
  • the extracting mechanism illustrated in Figures 18 to 31 is composed of five pieces, viz, the piece 34, the two expulsers or pushing members 44 and 45, the claw 42 and the part of the extractor forming the strokeregulator 46.
  • Each of the two expulsers 44 and 45 is formed of two pieces; the expulserhead 44 and 45, and the rod 44 and 45.
  • the rods of the two expulsers are alike and they comprise, at their lower end, a slot 47.
  • the extractor heads 44*, 45 correspond in shape with the contacts 12 and 13.
  • the stroke of the claw 42 is limited upwardly by the lower face 48 of the shoulder 48 of the stationary piece 34 (see Figure 22) and the strokes of the pushing members 44 and 45', are determined so that the top 49 of the piece 34 will disengage itself from the cavity 49 of the lamp head into which it was engaged during the moulding, and the loop 14 of the wire 14, 18 may be withdrawn from the claw 42.
  • the rod 43 of the claw is fastened rigidly to a block 46, called a stroke-regulator, integral with the extractor 23, whilst the ends of the two other rods 44 and 45- penetrate into holes 50, into which they may slide vertically to an extent determined by the length of the slot 47, the
  • the metallic wire 14, 18 used for leading in wire is of a nature suited to perfect and hermetical inlaying into the glass and is of a suflicient length in order that this wire, when folded in the shape of a loop 14*, as shown by full lines in Figure 2, and engaged with the claw 42, will project at its upper ends, beyond the punch 20, when the latter is in its uppermost position.
  • the punch 20 and the die 21 are opened, a pair of contacts 12, 13 are inserted into the piece .34, on the heads 44, 45" of the extractor-pushing members, and the loop 14" of the wire 14, 18 is engaged as aforesaid with the claw 42, the operator maintaining in his left hand the upper ends of the wire 14, 18.
  • the die is closed by the right hand by means of a handle 52 fastened to the right-hand half-die and which causes the closure of the other or left-hand half-die, by mechanism of a known type ( Figures 8 and 9) comprising the two toothed wheels 73 and 73 and links 74, 75 and 74 75, and care is taken that the branches 14 and 18 of the wire locate themselves in the flutings 29 of the part 26 of the punch in which they have sufiicient clearance to permit vertical movements of the punch. The punch is then closed.
  • the movable bracket 53 supporting the punch 20 is slightly rotated around the axis 54 and sufficiently to allow the wires 14. 18, which were directed vertically upon the middle of the die, to place themselves obliquely, so as to leave free the opening 55 of the die ( Figures 15 and 17).
  • the two parts26 and 27 which constitute the punch proper are removable and mounted on a support or punch-holder formed of two parts 67 and 68 hinged at 28.
  • the fastening of each punch in its support is efl'ected, on one hand, by means of ribs 80 which engage grooves provided in the support, and, on the other hand, by means of screws 81 which prevent movement of the ribs in the grooves.
  • the two halfpunches 26 and 27 may be hollowed internally at 83, the cavity thus formed being if necessar lined with asbestos-wool, sand, or any 0t 1er insulator held in place by plates 82; in this cavity 83 might also be located an electric resistance for the heating. If, on the contrary, the punch is required tobe cooled, an air current can be led through this cavity.
  • Another modification consists in the provision of a spring 84, for instance a helical spring coile upon the extension of the hinge axis 28.
  • a spring 84 for instance a helical spring coile upon the extension of the hinge axis 28.
  • One of the ends of the spring 84 is fast to the axis 28, whilst the other end is engaged into the head of a bolt 85 mounted upon the movable punch-holder 68, the spring 84 having for its efi'ect to antomatically open the punch after each operation when the lock or closing device 86 has been disengaged.
  • the stationary half-punch 26 may comprise a projection 87 with two grooves 88, 88 fulfilling the same function as the groves 29 ( Figures 10 and 11); or two hooks serving as a guide for the wire, this projecting part 87 having, in its center, a hole 89 drilled vertically.
  • the projection 87 may be surmounted, opposite to the hole 89, by a tube 90 ( Figure 36) which may be stoppered in the upper part, or freely open in the air, or also extended by means of a tube rovided with a cock for connecting it altersisted, if necessary, by the suction produced by the vacuum, and when the lamp head is pressed, the compressed "air forces the glass-bar thus formed to go out from its hole or cell.
  • a tube 90 Figure 36
  • Figures 37 and 38 is illustrated a modified form of the extractor adapted to be utilized in a mould for a bayonet joint lamp head wherein the two contacts 12 are alike, and it is composed of similar elements as in the extractor described in connection with the mould for a screw joint lamp head.
  • the projection 49 of the piece 34 may be dispensed with, as Well as the expulser as far as the remaining expulser 44 is concerned, its head 44 has two cells 44", in each of which is dis-. posed a contact 12 which must be superficially cast into the lamp head. It will thus be seen that, in this case, the extracting mechanism is reduced, on one hand, to the claw 42 and, on the other hand, to a single expulser 44.
  • the cover- may be traversed by four wires instead of two.
  • several expulsers may be provided according to the number of metallic contacts inlaid into the cover.
  • each half-die 92 may comprise lateral recesses 95 into which the glass will penetrate during the moulding and which will constitute the fins or projections of a bayonet oint.
  • the method of producing lamp heads of the kind described comprising, the steps of positioning contact Wires in a mold, 1ntroducing molten. glass into the mold in direct contact with the walls thereof and around the wires, inserting a pinch into the mold to shape the inner surfaces of the lamp head, and extnacting the lamp head from the mold.
  • the method of producing lamp heads of the kind described comprising, the steps of positioning contacts and leading in wires in a mold, introducing molten glass into the mold in direct contact with the walls thereof and with the contacts and around the wires, inserting a punch into the mold to shape the interior surfaces of the lamp head and extracting, the lamp head from the mold.
  • Apparatus for making glass lamp heads of the kind described comprising a mold adapted to receive molten glass in direct contact with its wall, a base for said mold, a claw guided in said-base for holding the leading in wires of the lamp head during the molding thereof, a core punch with ducts therein for the leading in wires, means for bringing the mold and core punch into and out of co-operative relationship with each other, extractor means for removing the finished lamp head from the apparatus, and/ means for operating the claw and the extractor means.
  • Apparatus for making glass lamp heads of the kind described comprising, a mold adapted to receive molten glass in direct contact with its wall, a base for said mold, means extending from said base for supporting the contacts of the lamp head during the molding thereof, a claw guided in sald base for 'holding the leading in wires of the lamp head during the molding thereof, a core punch with ducts therein for the leading in wires, means for bringlastic at moulding temperatures, of-
  • said mold a claw guided in said base for holding the leading in wires of the lamp head during the molding thereof, a core punch with ducts thereimfor the leading in wires, means for bringing the mold and core punch into and out of co-operative relationship with each other, extractor means for removing the finished lamp head from the apparatus, and means for operating the claw and the extractor means.
  • Apparatus for making glass lamp heads of the kind described comprising, a
  • mold constituted of portions hinged to each other and adapted to receive molten glass in direct contact with its wall, a base for said mold, means extending from said base for supporting the contacts of .the lamp head during the molding thereof, a claw" guided in said base for holding the leading in wires of the lamp head during the molding thereof, a core punch with. ducts therein for the leading in wires, means for bringmg the mold and core punch into and out of co-operative relationship with each other,
  • extractor means for removing the finished lamp head from the apparatus, and means for operating the claw andthe extractor means.
  • a mold constituted of portions hinged to each other and adapted to receive molten glass in direct contact with its wall, a base embraced by said mold portions, a claw guided in said base for holding the lead-.
  • Apparatus for making glass lamp heads of the kind described comprising, a mold constituted of portions hinged to each other and adapted to receive molten glass in direct contact with its wall, a base embraced by said mold portions, means extending from said base for supporting the contacts of the lamp head during the molding thereof, a claw guided in said base for holding the leading in wires of the lamp head during the means for operating the claw and the extractor means.
  • Apparatus for making glass lamp heads of the kind described comprising, a mold adapted to receive molten glass in direct contact with its wall, a base for said mold, a claw guided in said base for hold ng the leading in wires of the lamp head dur ng the molding thereof, a core punch having two hinged parts and with ducts therein forthe leading in wires, means for bringing the mold and corepunch into and out of cooperative relationship with each other, extractor means for removing the fimshed lamp head from the apparatus, and means for operating the claw and the extractor means.
  • Apparatus for making glass lamp heads of the kind described comprising, a mold adapted to receive molten glass in direct contact with its wall, a base for said mold, means extending from said base for supporting the contacts of the lamp head during the molding thereof, a claw guided in said base for holding the leading in wires of the lamp head during the molding thereof, a core punch having two hinged parts and with. ducts therein for the leading in wires, means for bringing the mold and core punch into and out of co-operative relationship with each other, extractor means for removing the finished lamp head from the apparatus, and means for operating the claw and the extractor means.
  • Apparatus for making glass lamp heads of the kind described comprising, a mold constituted of portions hinged to each other and adapted to receive molten glass in direct contact with its wall, a base for-said mold, a claw guided in said base for holding the leading in wires of the lamp head during the molding thereof, a core punch having two hinged parts and with ducts therein for the leading in wires, means for bringing the mold and core punch into and out of co-operative relationship with each other, extractor means for removing the finished lamp head from the apparatus, and means for operating the claw and the extractor means.
  • Apparatus for making glass lamp heads of the kind described comprising, a mold constituted of portions hinged to each other and adapted to receive molten glass in direct contact with its wall, a base for said mold, means extending from said base for supporting the contacts of the lamp head during the molding thereof, a claw guided in said base for holding the leading in wires of the lamp head during the molding thereof, a core punch having two hinged parts and with ductstherein for the leading in wires, means for bringing the mold and core punch into and out of co-operative relationship with each other, extractor means for removing the finished lamp head from the apparatus, and means for operating the claw and the extractor means.
  • Apparatus for making glass lamp heads of the kind described comprising, a
  • mold constituted of portions hinged to each other and adapted to receive molten glass in direct contact with its wall, a base embraced by said mold portions, a claw guided in said base for holding the leading in wires of the lamp head during the moldin thereof, a core punch having two hinge parts and with ducts therein for the leading in wires,
  • Apparatus for making glass lamp heads of the kind described comprising, a mold constituted of portions hinged to each other and adapted to receive molten glass in direct contact with its wall, a base embraced by said mold portions, a claw guided in said base for holding the leading in wires of the lamp head during the molding thereof, means extending from said base for su porting the contacts of the lamp head uring the molding thereof, a core punch having two hinged parts and With ducts therein for the leading in wires, means for bringing the mold and core punch into and out of cooperative relationship with” each other, extractor means for removing the finished lamp head from the apparatus, and means for operating the claw and the extractor means.
  • Apparatus for making glass lamp heads of the kind described comprising, a mold adapted to receive molten glass in direct contact with its wall, a base for said mold, a claw guided in said base for holding the leading in wires of the lamp head during the molding thereof, a core punch with ducts therein for the leading in wires, means for moving the punch vertically with respect to the mold, extractor means for removing the finished lamp head from the apparatus, and means for operating the claw and the extractor means.
  • Apparatus for making glass lamp heads of the kind described comprising, a mold adapted to receive molten glass in direct contact with its wall, a base for said mold, a claw guided in said base for holding the leading in wires of the lamp head during the molding thereof, a core punch with ducts therein for the leading in wires, means for moving the punch vertically with respect to the mold, extractor means for removing the finished lamp head from the 6 apparatus, means for operating the claw and extractor means, and means for enabling the punch to be moved laterally with respect to the mold.
  • Apparatus for making glass lamp 10 heads of the kind described comprising, a I mold adapted to receive molten glass in directcontact with its wall, a base for said mold, a claw' guided in said base for bolding the leading in wires of the'lamp head durin the molding thereof, a core punch with note therein for the l'eadin in wires, means for moving the punch vertically with respect to the mold, a pair of extractor rods slidable in the base, heads on said extractor 2 rods adapted to hold the contacts during the molding operation, and means for operating the claw and the extractor rods.
  • Apparatus for making glass, lamp heads of the kind described comprising, a mold adapted to receive molten glass in direct contact with its wall, a base for said mold, a claw guided in said base for holding the leading in wires of the lamp head during the molding thereof, a core punch'with ducts therein for the leading in wires, means for moving the punch vertically with respect to the mold,- a pair of extractor rods slidable in the base, heads on said extractor rods adapted to hold the contacts during the molding operation, and a single mechanism for operating the claw and extractor rods, said mechanism having means for retarding the movement of the extractor rods relatively to that of the claw.
  • Apparatus for making glass lamp heads of the kind described comprising, a mold adapted to receive molten glass in direct contact with its wall, a base for said I mold, a claw guided in said base for holding the leading in wires. of the lamp head during the molding thereof, a core punch with ducts therein for the leading in wires, means for moving'the unch vertically with respect to the mold a pair of extractor rods 50 slidable in the base, heads on said extractor rods adapted to hold the contacts during the molding operation, means for operating the claw and the extractor rods, and a removable block mounted in the base, said block mold adapted toreceive molten glass in direct contact with its wall, a base for said mold, a claw guided in said base for hold- .ing the leading in wires of the lamp head during the moldin thereof, a core punch with ducts therein %or the leadin in wires,- means for movin the punch vertically with respect to the mo d, a pair of extractable
  • Apparatus for making glass lamp heads of the kind described comprising, a mold adapted to receive molten glass in direct contact with its wall, a base for said mold, a claw guided in said base for holding the leading in wires of the lamp head during the molding. thereof, a core punch with ducts therein for the leading wires, means for bringing the mold and core punch into ea and out of co-operative relationship with. each other, extractor means for removing the finished lamp head from theapparatus,
  • Apparatus for making glass lamp heads of the kind described comprising, a

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Adornments (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US596173A 1921-10-29 1922-10-21 Apparatus and method for the production of incandescent lamps Expired - Lifetime US1606276A (en)

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US596172A Expired - Lifetime US1861167A (en) 1921-10-29 1922-10-21 Bulb, tube, or other hermetically closed receptacle for incandescent electric lamps and similar devices and process of manufacture of the same
US596173A Expired - Lifetime US1606276A (en) 1921-10-29 1922-10-21 Apparatus and method for the production of incandescent lamps

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US (2) US1861167A (ko)
DE (2) DE478499C (ko)
FR (1) FR571782A (ko)
GB (3) GB187989A (ko)
NL (4) NL15725C (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442860A (en) * 1942-10-10 1948-06-08 Westinghouse Electric Corp Molding glass articles
US2556059A (en) * 1949-06-21 1951-06-05 Tung Sol Lamp Works Inc Electric incandescent lamp and method of manufacturing

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2464990A (en) * 1945-08-28 1949-03-22 Westinghouse Electric Corp Electric lamp manufacture
US2644100A (en) * 1945-12-28 1953-06-30 Tung Sol Electric Inc Sealed lighting unit and method of manufacture
US2573553A (en) * 1946-09-28 1951-10-30 Sylvania Electric Prod Overlapping header for radio tubes
BE476683A (ko) * 1946-10-11
US2504303A (en) * 1947-05-23 1950-04-18 Bell Telephone Labor Inc Metal to glass sealing method
US2499854A (en) * 1947-09-08 1950-03-07 Sylvania Electric Prod Sealing method
US2543093A (en) * 1948-12-28 1951-02-27 Tung Sol Lamp Works Inc Electric lamp
US2694273A (en) * 1951-06-20 1954-11-16 Raytheon Mfg Co Method of tipless sealing of vitreous envelopes
US2799814A (en) * 1953-09-01 1957-07-16 Sylvania Electric Prod Germanium photodiode
DE1295079B (de) * 1961-10-12 1969-05-14 Vossloh Werke Gmbh Beruehrungsschutzanordnung fuer die Halterung elektrischer Gluehlampen mit Schraubensockel
US5747919A (en) * 1994-12-29 1998-05-05 Philips Electronics North America Corporation Electric lamp having a hybrid skirted lamp base
US5568009A (en) * 1994-12-29 1996-10-22 Philips Electronics North America Corporation Electric lamp having a lamp cap with solder-free connections

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442860A (en) * 1942-10-10 1948-06-08 Westinghouse Electric Corp Molding glass articles
US2556059A (en) * 1949-06-21 1951-06-05 Tung Sol Lamp Works Inc Electric incandescent lamp and method of manufacturing

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GB187988A (en) 1923-12-13
GB187989A (en) 1923-10-11
GB187990A (en) 1923-09-27
NL14148C (ko)
DE466897C (de) 1928-10-16
DE478499C (de) 1929-06-29
NL15725C (ko)
US1861167A (en) 1932-05-31
FR571782A (fr) 1924-05-23
NL18909C (ko)
NL20721C (ko)

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