US3828831A - Method of manufacturing a chain of filaments for filament lamps,discharge tubes or the like - Google Patents

Method of manufacturing a chain of filaments for filament lamps,discharge tubes or the like Download PDF

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Publication number
US3828831A
US3828831A US00335944A US33594473A US3828831A US 3828831 A US3828831 A US 3828831A US 00335944 A US00335944 A US 00335944A US 33594473 A US33594473 A US 33594473A US 3828831 A US3828831 A US 3828831A
Authority
US
United States
Prior art keywords
mandril
wire
filaments
clamping members
clamping
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
US00335944A
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English (en)
Inventor
G Moeys
J Wittkamper
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.)
US Philips Corp
Original Assignee
US Philips 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
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3828831A publication Critical patent/US3828831A/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
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/02—Manufacture of incandescent bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49087—Resistor making with envelope or housing
    • Y10T29/49096—Resistor making with envelope or housing with winding

Definitions

  • the invention relates to a method of manufacturing a chain of helically wound filaments for electric filament lamps, discharge tubes, or the like, which filaments are' connected by intermediate members, in which the starting material is a wire wound on a mandril, which mandril is subjected in a number of successive places to a severing treatment and which wire is expanded in said places in such manner that intermediate members are formed, the mandril which is divided into pieces being removed afterwards.
  • Such a method is known.
  • the mandril is broken by means of a chisel which is driven into the mandril between two turns.
  • Thestroke movement of the chisel should be so accurate that the mandril is broken without touching the wire. While one part of the mandril is held, the broken part of the mandril is forced away by the chisel. The wire which connects the two parts of the mandril is stretched.
  • the drawback of this method is that it is not suitable in practice for manufacturing filaments having a very small wire diameter because the danger that the chisel does not only break the mandril but also breaks the wire becomes larger as the diameters of wire and mandril are chosen to be smaller.
  • the method according to the invention is characterized in that the mandril with the wire wound on it is exposed to the action of two clamping members engaging on either side of a severing place, said members being moved apart to such an extent that the mandril breaks at that area while forming an intermediate member.
  • the wire is wound helically across the mandril, the part of the wire which is present between the clamping member can easily be stretched. However, the mandril is solid, and will therefore break when the clamping members are moved apart while the wire is only stretched and forms an intermediate member.
  • Thermal energy is preferably applied to the part of the mandril and the wire present between the clamping members.
  • the advantage of this is that a smaller pulling force is necessary for breaking the mandril.
  • a favourable embodiment of the method according to the invention is characterized in that the thermal energy is supplied by means of an electric current passed through the mandril and the wire, the clamping members being constructed as electrodes. Because the produced thermal energy is dissipated via the clamping members, the temperature of the mandril is highest centrally between the clamping members so that in said position the mandril is weakest and will preferably break at that area. As a result of this it is possible to produce a chain of filaments of the same length which are connected together by intermediate members of likewise the same length.
  • the clamping members, after breaking of the mandril are preferably moved further apart to form a straight intermediate member.
  • the invention furthermore relates to a chain of helically wound filaments for electric filament lamps, discharge tubes or the like, which filaments are connected together by intermediate members, manufactured by any of the above-described methods.
  • the invention furthermore relates to a helically wound filament which is provided with stretched ends and which has been obtained by severing the intermediate members occurring in the above-mentioned chain.
  • FIGS. 1a to 1e show the stages which can be distinguished in this embodiment.
  • FIG. 2 shows the temperature variation in the mandril upon heating by means of electric current.
  • starting material is a wire 1 of tungsten which is wound on a mandril 2.
  • the mandril with the wire are clamped in the clamping members 3
  • the mandril 2 is reduced in crosssection and breaks centrally between the jaws 3 and 4 and at thesame time the wire 1 is stretched so that an intermediate member 7 is formed.
  • the clamping members after breaking the mandril are moved further apart, the intermediate member 7 will assume a straight shape.
  • the clamping members 3 and 4 are opened, jaw 4 is moved in the direction of the arrow q until it assumes the position shown in 1a and the mandril is pulled between the clamping members in the direction denoted by the arrow r.
  • the clamping members (1d) are then closed after which jaw 4 is again moved in the direction of the arrow p (1e).
  • a chain of mandril segments 5 is formed on which a number of turns occur, in this embodiment four turns, which are connected together by means of intermediate members 6 and 7.
  • the segments 5 are removed by means of an etching treatment.
  • the chain is preferably left intact until after said etching treatment; the filaments are formed only on the lamp mounting machine by severing the intermediate members.
  • a method of manufacturing a chain of helically wound filaments for electric filament lamps, discharge tubes or the like, which filaments are connected by intermediate wire members comprising the steps of:
  • thermo energy is supplied by means of an electric current passed through the mandril and the wire, the clamping 5 membermembers being constructed as electrodes.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wire Processing (AREA)
  • Resistance Heating (AREA)
US00335944A 1972-03-16 1973-02-26 Method of manufacturing a chain of filaments for filament lamps,discharge tubes or the like Expired - Lifetime US3828831A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7203462A NL7203462A (enrdf_load_html_response) 1972-03-16 1972-03-16

Publications (1)

Publication Number Publication Date
US3828831A true US3828831A (en) 1974-08-13

Family

ID=19815608

Family Applications (1)

Application Number Title Priority Date Filing Date
US00335944A Expired - Lifetime US3828831A (en) 1972-03-16 1973-02-26 Method of manufacturing a chain of filaments for filament lamps,discharge tubes or the like

Country Status (6)

Country Link
US (1) US3828831A (enrdf_load_html_response)
JP (1) JPS5310395B2 (enrdf_load_html_response)
CA (1) CA964325A (enrdf_load_html_response)
FR (1) FR2175948B1 (enrdf_load_html_response)
GB (1) GB1357718A (enrdf_load_html_response)
NL (1) NL7203462A (enrdf_load_html_response)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51136494A (en) * 1975-05-07 1976-11-25 British Steel Corp Monitoring method and apparatus for poisonous composites in atmosphere

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE424804C (de) * 1923-10-16 1926-02-02 Patra Patent Treuhand Verfahren und Maschine zur Herstellung schraubenlinienfoermiger, mit gestreckten Enden ausgestatteter Leuchtkoerper fuer elektrische Gluehlampen
US2667204A (en) * 1952-03-29 1954-01-26 Westinghouse Electric Corp Coiling head assembly

Also Published As

Publication number Publication date
FR2175948B1 (enrdf_load_html_response) 1976-09-10
DE2312628A1 (de) 1973-09-20
JPS493488A (enrdf_load_html_response) 1974-01-12
FR2175948A1 (enrdf_load_html_response) 1973-10-26
GB1357718A (en) 1974-06-26
DE2312628B2 (de) 1977-06-08
JPS5310395B2 (enrdf_load_html_response) 1978-04-13
NL7203462A (enrdf_load_html_response) 1973-09-18
CA964325A (en) 1975-03-11

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