US2975556A - Heat-protective coating - Google Patents

Heat-protective coating Download PDF

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Publication number
US2975556A
US2975556A US685865A US68586557A US2975556A US 2975556 A US2975556 A US 2975556A US 685865 A US685865 A US 685865A US 68586557 A US68586557 A US 68586557A US 2975556 A US2975556 A US 2975556A
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US
United States
Prior art keywords
base
glass
base shell
heat
protective coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US685865A
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English (en)
Inventor
Norman F Baird
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL103898D priority Critical patent/NL103898C/xx
Priority to NL231132D priority patent/NL231132A/xx
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US685865A priority patent/US2975556A/en
Priority to DEW24076A priority patent/DE1093480B/de
Priority to GB29457/58A priority patent/GB847561A/en
Application granted granted Critical
Publication of US2975556A publication Critical patent/US2975556A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/42—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp
    • H01K1/46—Means forming part of the lamp for the purpose of providing electrical connection, or support for, the lamp supported by a separate part, e.g. base, cap

Definitions

  • This invention relates to heat-protective coatings and,; more particularly, to heat-protective coatings forl processing aluminum base shells for lamps.
  • Incandescent lamp bases are prepared .by rst stamp- I ing a base shell into a predetermined configuration-which 1s normally generally cylindrical and threaded, termi-l nating in an inwardly-projected lip at the lower extremities of the base shell. trical contact for the lamp.
  • An eyelet which is fabri-j cated of an electrically-conductive material such as brassis positioned in a centrally-disposed location" adjacent the lower extremities of the base shell proper, and this eyelet is electrically insulated from the base shell ⁇ by an insulating button such as glass. This eyelet forms aa second electrical contact for the incandescent lamp;
  • the eyelet and base shell are placed into a mold and'- molten glass is inserted or poured into the lower inter1or surfaces of the base shell and aboutthe eyelet. This electrically insulates the eyelet from the base shell and serves to secure the eyelet in a centrally-disposedI position adjacent the lower extremities of the base'shell.
  • the base shells were In ⁇ recent years, the in- 2,975,556 Patented Mar. 2 1, 1961 phat'e and sodium polyacrylate a water-vehicle;
  • This base shell forms one elec-g Fig, 2 isa sectional elevation of an unprocessed alumif num base Shell; v :Fig- 3 isa perspective View of an electrically-conducting eyelet ⁇ before incorporation into the lamp base;
  • Fig-4 isa diagrammaticplanview of an apparatus for processing lamp bases, generally illustrating the opera# tions at various stations; l.lf-iig. 5 is a fragmentary, sectional view taken at station 3 in Figi 4 showing the -application of the heat-protec tive coating; j Y
  • Eig. 6 ⁇ is a fragmentary, sectional-view taken at staiV tion 4 in Fig. 4 showing the glassing operation;
  • Fig 7 is a fragmentary, sectional view takenatstation 6 in Fig. 4 showing the plunger-die operation for form ⁇ T ingthe lpoured glass into the desired-conguration.
  • -It is a further object to provide a method for glassing an aluminum base shell for a lamp wherein any tendency of ⁇ the aluminum to melt during the glassing operation is substantially inhibited.
  • a heat-protective coat# ing for processing aluminum base shells which coating principally comprises an adrnixture of sodium borophosshell 22 and this coating may be applied as asprayb ductor is electrically connected to the centrally-disposedl and electrically-conducting eyelet 24, which eyelet isf electrically insulated from aluminum base shell by Vax insulating button 26 which may be fabricated of glass;
  • Vax insulating button 26 which may be fabricated of glass
  • Fig. 2 is shown an aluminum base shell 22, beforei the glassing operation and such a base shell normally" has a generally-hollow-cylindrical and threaded coniguration.
  • l The lower portion of the base. shell formsv 'anl inwardly-projecting lip 28 which serves to hold'the glass insulating button 26.
  • Fig. 3 In Fig. 3 is shown the electrically-conductingeyelety 24 which may be punched from brass, Ifor example, and? which eyelet has a centrally-disposed aperture 30 form ing a retaining lip which cooperates with thel pouredglass insulating button 26 to retain the eyeletin posifl tion.
  • "f j In Fig. 4 is shown a diagrammatic plan view of a base-. fabricating machine 32, modiied slightly to provide f olf4 the application of the heat-protective coating as described herein.
  • Such machines arel normally designedl to .be indexed through a plurality of positions orwork station; and at the station designated 1, the yeyelet Z4 is fedi' into the-receiving mold by conventional techniques.
  • the station designated 2,l thebase shell 22 isfed f, the receiving mold by conventional practices.
  • Atythfe; station designated 3 the heat-protective ,eoatinggis-apw plied to at least the :lower interior 'portionsoffithebse the' Baseshell z2.l 'This' moltenrglass ⁇ serves to separate the eyelet z4gfr'o ⁇ m A'the base shell 22. Thereafter, excessive fglass -is blown from the upper surfaces of the molds and from between thee-'molds at the glass-cutter stations designated '5 4and this also serves to partially cool the pouredf'glia's's.
  • a pin plunger removes any residue of glass from the aperture 30 -of the centrally-disposed eyelet Z4 and thereafter at shel 22h51 means ofa conventional atornizerv 36.
  • the'heaft-pro'tective coating could be applied to the, base shell 22 before the base shell was placed on the coatingV machine, but it is far more convenient automagically to apply this coa-fing after the shell 22 has'
  • the heat-protective coating principally comprises 'from 31o-30% by weight sodium'borophosphate, from 10% to 15% by weightV sodium polyacrylate'and from n55% to 87% by Weight/Water.
  • the molten glass which Vis poured into the base shell during the glassing operation may have Ala temperature of from 1 ⁇ l8 ⁇ 5 C.
  • the heat-protective coating forms a barrier or heatprotective layer ⁇ between 'the molten vglass andthe aluminuxn base shell', substantially inhibiting any tendency for the' aluminumfba'se shell to melt.
  • Theencasedsteam serves they dualV function'of providing an excellent insulating layer and also im'p'airing the v'adhe ⁇ renc'e of the sodium borophosphate for ,the'base' shell, which isf/highly vdesirable ⁇ as will be explained hereinafter.
  • a solution of sodium bo'rophosphate in Water has a relatively low viscosity and will not ⁇ adhere ⁇ to the aluminum base shell in sufficient amounts ,to provide the proper degree of protection during the glassing operation-
  • Sodium poly'acirylate v has ya high, viscosity, is yreadily soluble inwalter, as is'sodium borophosphate, and sodium polya't:ryl'atev has ahigh heatof vaporizationl
  • This material tendsjto leave a 'carbonacleou's residue after beingheated, whichresidue isrn'ot readily removed hva water wash; rlffhis residue impairs the appearance of the vcompleted base 'and alsotends to form low-electrical-resistanee pat-hs;
  • the cullet glass as'V "usedV herein, has the composition 76.8%- by weight Si02, 17.4% lb'y Weight NaZO, 0,6% by weight K2 ⁇ O, ⁇ 0;4% byweight CaO' and 316% by weight Mg'O. It should be understoodV th'at this glass is only given vby way of specic example and other glasses and glassing lcomposi'tions' may be substituted. V
  • Fig'. 7 is shown the glass-forming'operation at the station designated"6 in Fig. 4.
  • the glass-forming plunger 38 provides the interior surface of thepouredglass with an inverted, generally-conical configuration inforider that thecenter lead wire may beinserted, 'into the eyelet by automatic equipment.V
  • the plunger station follows the glass pouring station ata sufficient time ⁇ interval that the glass has 'partiallyyco'oled so that it isin aaplasticistat'e rather than la molten state. Thereafter,-at the staion designated ".7 in Fig.
  • V4,J a ⁇ conventional auxiliaryglass plunger whichV is internally cooled with water, for ⁇ example, isV inserted into the base in order tosubstantiallycool the poured glass.
  • An additional plunger 'not shown, punches any residual Vglass which may'remain'within the centrally-disposed aperture 30 within the eyelet 24 inorder that the center'lead wire may be inserted therethrough during'theplamp fabricadirt and other impurities as well as the residual heatprotective coating which remains.
  • any commercial cleaner may be used and the bases are placed into the cleaningy solutions and agitated. This removes substantially all traces of dirt and other impurities as well as residual heat-protective coating.
  • the bases may be agitated in a dilute solution of nitric and sulphuric acid at a concentration of 40 to 45 Baume.
  • the bases may be cleaned with a 5% solution of ammonical soap or with a 3% to 5% lauryl-sulphate-type detergent, such as is commercially available under various trademarks.
  • Other commercially-available cleaning solutions may be substituted for the specific examples given hereinbefore.
  • a further advantage of the heat-protective coating disclosed herein is that the aluminum base shells may be made thinner, if desired, thus eliminating the cost of using added aluminum in the base shells.
  • the aluminum base shells may be made thinner, if desired, thus eliminating the cost of using added aluminum in the base shells.
  • the thermal capacity required for the aluminum base shell is decreased and a medium-screW-type base shell having a thickness of only .0105 inch is generally satisfactory and will display substantially no melted portions.
  • the objects of the invention have been achieved by providing a heat-protective coating for processing aluminum base shells as well as a method for processing aluminum base shells wherein any melting of the aluminum due to the molten glass is substantially eliminated.
  • the aluminum base shells may be made thinner, if desired.
  • a heat-protective'coating for processing aluminum base shells for lamps said coating principally comprising from 3% to 30% by weight sodium borophosphate, from to 15% by weight sodium polyacrylate, and from 55% to 87% by weight Water.
  • a heat-protective coating for processing aluminum base shells for lamps said coating principally comprising about 5% by weight sodium borophosphate, about 10% by Weight sodium polyacrylate, and about 85% by weight Water.
  • the method of glassing an aluminum base shell for a lamp comprising applying to at least the lower interior surfaces of the aluminum base shell a heat-protective ⁇ coating principally comprising from 3% to 30% by weight sodium borophosphate, from 10% to 15% by In explanaweight sodium polyacrylate and from 55% to 87% by Weight water, inserting a predetermined amount of molten glass into a mold containing said coated base shell to till a selected portion of said coated base shell, cooling said base and said glass to secure said glass in said base, and thereafter cleaning said base with a cleaning solution to remove residual heat-protective coating.

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  • Paints Or Removers (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
US685865A 1957-09-24 1957-09-24 Heat-protective coating Expired - Lifetime US2975556A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL103898D NL103898C (da) 1957-09-24
NL231132D NL231132A (da) 1957-09-24
US685865A US2975556A (en) 1957-09-24 1957-09-24 Heat-protective coating
DEW24076A DE1093480B (de) 1957-09-24 1958-09-11 Verfahren zum Einbringen des Glasknopfes in Aluminiumsockelhuelsen elektrischer Lampen
GB29457/58A GB847561A (en) 1957-09-24 1958-09-15 Improvements in or relating to heat protective coatings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US685865A US2975556A (en) 1957-09-24 1957-09-24 Heat-protective coating

Publications (1)

Publication Number Publication Date
US2975556A true US2975556A (en) 1961-03-21

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ID=24753991

Family Applications (1)

Application Number Title Priority Date Filing Date
US685865A Expired - Lifetime US2975556A (en) 1957-09-24 1957-09-24 Heat-protective coating

Country Status (4)

Country Link
US (1) US2975556A (da)
DE (1) DE1093480B (da)
GB (1) GB847561A (da)
NL (2) NL231132A (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796528A (en) * 1972-04-28 1974-03-12 Westinghouse Electric Corp Apparatus for manufacturing an electric lamp base that has a snag-proof terminal
US4781641A (en) * 1986-12-04 1988-11-01 North American Philips Lighting Corp. Tool for making three-way lamp bases
US4787865A (en) * 1986-12-04 1988-11-29 North American Philips Lighting Corp. Three-way lamp bases and method for making them

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1011586A (en) * 1911-04-11 1911-12-12 Providence Gas Burner Company Apparatus for making electric-lamp bases.
US1976679A (en) * 1930-05-26 1934-10-09 Ig Farbenindustrie Ag Production of dispersions
FR797345A (fr) * 1935-11-18 1936-04-24 Perfectionnements aux machines à vitrifier les culots de lampes électriques pour l'opération du perçage des entrées de fils à travers la
US2158044A (en) * 1929-05-18 1939-05-09 Hygrade Sylvanla Corp Method of making contactor bases for electric lamps, tubes, and the like
US2387865A (en) * 1943-07-21 1945-10-30 Arthur Van Kleeck Fire-retarding coating
US2413146A (en) * 1943-07-15 1946-12-24 Continental Can Co Fireproof wiper roll
US2439395A (en) * 1945-06-30 1948-04-13 Leatherman Martin Fire-resistant coating composition
US2480790A (en) * 1945-07-28 1949-08-30 Rudolf F Hlavaty Fireproofing composition
US2538589A (en) * 1946-06-28 1951-01-16 Gen Electric Base making apparatus

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1011586A (en) * 1911-04-11 1911-12-12 Providence Gas Burner Company Apparatus for making electric-lamp bases.
US2158044A (en) * 1929-05-18 1939-05-09 Hygrade Sylvanla Corp Method of making contactor bases for electric lamps, tubes, and the like
US1976679A (en) * 1930-05-26 1934-10-09 Ig Farbenindustrie Ag Production of dispersions
FR797345A (fr) * 1935-11-18 1936-04-24 Perfectionnements aux machines à vitrifier les culots de lampes électriques pour l'opération du perçage des entrées de fils à travers la
US2413146A (en) * 1943-07-15 1946-12-24 Continental Can Co Fireproof wiper roll
US2387865A (en) * 1943-07-21 1945-10-30 Arthur Van Kleeck Fire-retarding coating
US2439395A (en) * 1945-06-30 1948-04-13 Leatherman Martin Fire-resistant coating composition
US2480790A (en) * 1945-07-28 1949-08-30 Rudolf F Hlavaty Fireproofing composition
US2538589A (en) * 1946-06-28 1951-01-16 Gen Electric Base making apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3796528A (en) * 1972-04-28 1974-03-12 Westinghouse Electric Corp Apparatus for manufacturing an electric lamp base that has a snag-proof terminal
US4781641A (en) * 1986-12-04 1988-11-01 North American Philips Lighting Corp. Tool for making three-way lamp bases
US4787865A (en) * 1986-12-04 1988-11-29 North American Philips Lighting Corp. Three-way lamp bases and method for making them

Also Published As

Publication number Publication date
GB847561A (en) 1960-09-07
NL103898C (da)
NL231132A (da)
DE1093480B (de) 1960-11-24

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