US1871018A - Coiled lamp filament - Google Patents

Coiled lamp filament Download PDF

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Publication number
US1871018A
US1871018A US403396A US40339629A US1871018A US 1871018 A US1871018 A US 1871018A US 403396 A US403396 A US 403396A US 40339629 A US40339629 A US 40339629A US 1871018 A US1871018 A US 1871018A
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US
United States
Prior art keywords
filament
wire
length
coil
coiled
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
US403396A
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English (en)
Inventor
Wadsten Sten
Hunt Charles Wallace
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.)
Westinghouse Lamp Co
Original Assignee
Westinghouse Lamp Co
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 claimed from US329149A external-priority patent/US1865490A/en
Application filed by Westinghouse Lamp Co filed Critical Westinghouse Lamp Co
Priority to US403396A priority Critical patent/US1871018A/en
Priority to GB39066/29A priority patent/GB339803A/en
Priority to DEW84599D priority patent/DE567855C/de
Priority to FR687378D priority patent/FR687378A/fr
Priority to NL49599A priority patent/NL26423C/xx
Application granted granted Critical
Publication of US1871018A publication Critical patent/US1871018A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01K3/02—Manufacture of incandescent bodies
    • H01K3/04—Machines therefor
    • 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

Definitions

  • This invention relates to the manufacture of incandescent electric lamps and is a division of application Serial No. 329,149 filed December 29, 1928 relatin to the production 5 of a coiled filament of defihite length for use in saidlamps.
  • Incandescent electric lamps may be generallydivided into two classes, first those employing a straight or uncoiled filament and secondsuch lamps as employ a light source consisting of a fine filamentary wire wound into helical form.
  • the present invention is concerned with the last mentioned type of filament which is generally known in the art" as the concentrated type, the same being adapted for use in either :a gas filled or evacuated bulb.
  • the coiling of a lamp filament to produce a light source is an important and exacting op-.
  • each section containing equal lengths of wire.
  • the filaments In winding of filaments on a mandrel the filaments may be cut to a* definite length while on the mandrel, but 'when removed therefrom the release of internal tension or other force results in the production of filamentsalthough containing equal lengths of wire still possess differences in their over-all lengths.
  • Another object of the invention is to provide lamp filaments consisting of coiled sections of equal over-all lengths.
  • Another object of the invention is to provide a method of producing coiled filamentary sections having uniform over-all lengths and in treating said-sections preparatory t in corporation-in a lamp.
  • Another object of the invention is to provide a simple'method of setting and cleaning such filaments for use It will be understood that in the manu- I facture of an incandescent electric lamp the internal structure includes a number of glass parts which may comprise an exhaust tube,
  • leading-in wires extend upwardly to the exposed end of the arbor which contains a plurality of what are termed, support wires. These wires have their ends em-. bedded in thea'rbor and extend radially therefrom. The free ends of the support wires are formed with hooks or pig tails to receive and hold a lamp filament and the ends of the filament are secured to ends of the leading-in wires.
  • the mounting operation will be a failure while in the second case a section oi the filament will be short circuited changing the rating of the lamp.
  • a filament may be wound on a coil winding machine, but instead of winding the coil in the form of a helix having the turns in spaced relation the coil may be wound in what is termed, a tight winding, that is each turn would be in contact with the adjacent turn or with no space existing therebetween.
  • the coil when so wound the coil may be cut into sections of given lengths which may be designated as the cutting lengths and then stretched so as to space the turns of the coil to such degree as to make the over-all length of the coiled section a given dimension. Coils of this character may then be employed in connection with an automatic mounting operation since all the coiled sections have a'given over-all length.
  • the coil may then be stretched to a specified length or specified number of turns per inch and a given diameter, thus giving the coils a uniform over-all length and at the same time maintaining the proper length of wire in the coil.
  • os1tion after stretching they may be flashed an electric current either in the air or an cable to since while the coils areheld in inert gas.
  • the carbon or other foreign material clinging to the wire is oxidized and the subsequent flashing in an inert gas serves to remove the oxide and flash off any remaining foreignsubstance or to reduce any tun sten oxide that may be present.
  • the present invention contemplates a method of producing filamentary bodies to serve as coil practical for use in connection with the automatic mounting of the coil.
  • Fig. 1 shows a diagrammatic representation of a coil winding die with driving rollersto propela wire for formation into a helix.
  • Fig; 2 shows a coiled Wire as itissuesfrom a die and moves in position to be severed by cutting knives, the coil shown is greatly exaggerated in-size for the purpose of. clearness.
  • Fig. 3 shows a section of coiled wire cut from a continuous length.
  • Fig. 4 shows the section of coiled wire illustrated inFig. 2 but stretched to a given len h.
  • 1g. 5 shows the wire disposed in a chamber containing an 1nert gas in which the coil may be heated.
  • Fig. 6 shows a. length of coiled wire stretched to length, heated and cleaned ready to be applied to a lamp stem in this view the coiled section more nearly approaches the proportions of the actual filament.
  • Fig. 7 is a plan View of a stem with the filament mounted thereon and illustrates the definite position of the leadingin wires and Fig. 8 is a side view of a portion of a lamp stem having a stretched filament applied thereto.
  • the present invention is applifilaments wound on a mandrel
  • the present example of one embodiment of the in vention applies to coils woundin the absence comprise a die 10 supported in a holder l1.
  • a lip (not shown) .which operates to space the turns of the coils as they issue from the die.
  • pitch of the coil maybe varied by' changing.
  • Machines for winding coils in accordance with the above are known to those skilled .in the art and a continuous length of helically coiled wire of a given pitch may readily be obtained.
  • the wire 14 issues from the die in the form of a continuous helix 16'as shown in F ig 2 and may pass through aguide 17 and between cutting edges 18 and '19, which serve to sever a section 21 of a, given length.
  • the severed coiled section 21 contains a predetermined amount of-wire, since in accordance with the operation of the machine the cutting knives are operated through the agency of a measuring drum so arranged that when a given point on the wire travels through a given distance the cutters operate thus the severed section always contains a given amount of wire.
  • the over-all length of the sections may var
  • the overall length of the sections may be construed as the length of the body of the coil from end to end indicated by the letter A77-'v
  • a continuous coil may be wound with the pitch of the turns relatively close or with a greater number of turns per unit of length than desired in the'section when secured to a stem as shown in Fig. 2.
  • the section 21 may then be severed and the ends gripped between pairs of jaws 22 and 23.
  • the pairs of jaws may be separated a given distance to stretch the section to increase its over-all length, indicated as B, and thus reduce the number of turns per unit of length giving a section 24 as shown in Fig. 4e.
  • a stem 25 may be taken as in position to have a filament automatically applied thereto.
  • the stem shown comprises'a press 26 from which an arbor 27 extends.
  • v eter may beemployed.
  • filamentary sections must be such that ends 35 and 36 will y lie in position on the leading-in wires when the filament is disposed in its circular position in the support Wires.
  • The. circumferential dimension of. the filament when on a stem must therefore be equal to B without changingthe number of turns per unit of length in the coiled section.
  • the present invention however, further contemplates the step'of cleaning the filament. It is well known that when using difiiculty is encountered in cleaning the coils, Black wire consists of drawn tungsten in which a lubriis used during the This lubricant adheres to the wire and if not removed is detrimental to the life of a lamp in which the filamentmay be incorporated. Heretofore the coils or filaments were cleaned by immersion in sodium hydroxide and a solution of sodium bichromate.
  • tungsten filament wire of 1.85 mils diam- I
  • This wire is'coiled into a continuous helix having an outside diameter of about 10.8 mils and having 390 turns per inch.
  • a section equal to A is then severed and stretched about 5% to give a section having 370 turns er inch and an over-all dimension equal'to B.
  • the dimension A is a determined dimension and selected so that when the filament is stretched the 'dimension B will be'such that the ends of the coiled section will take their proper positions on the leading-in conductors which are in a given fixed relation for the type oflamp in' which the filament is to be used.
  • the initial winding of a spaced coil having a greater number of turns'per unit of length than the final coil may, however, as hereinbefore mentioned, be wound with the turns in contact and subsequently stretched and flashed.
  • an advantage is gained in that thelip of the coil winding die may be omitted to the end, that the construction of the die is simplified. This is important since coil winding dies are generally made from a diamond and if the construction can be made less com licated the cost of producing such dies'is re need and by reason of the absence of the lip there is less danger of breakage.
  • a coiled section having a given number of turns er unit of length is severed from acoil of in efinite length: The severed section is then gripped between jaws 22 and 23; These jaws secure a plurality of turns of the coil, these turns which constitute the terminals of the filament are indicated as 43 and 44. Each end is so held that their initial pitch is maintained during the stretching operation. This results in a coil body or section wherein the major or light giving 1.
  • the ends of the filament are secured to leading-in conductors, the ends of which are usually bent over and clamped upon the end-pf the filament.
  • the jaws 22 and23 By making the jaws 22 and23 of slightly greater width than the width of the clamps at the end of the conductors the unheated portions or terminals of the filament will be of'sufficient length to extend slightly from the side of the clamp of the leading-in wires or conductors thus giving a turn or Half a turn of pliable wire 45 adjacent to the clamping point.
  • a filament so constructed tends to resist breakage due to vibration and since it has been found that in a lamp filament the 1 portion of wire adjacent to the clamp is subjected to severe strain and since the present construction serves to improve the strength of this portion of the filament, a new and decided advantageous result is attained.
  • the portion held by the jaws obviously do not receive the same degree of cleaning as the main portion of thefilament.
  • the filament may be given an additional cleaning step by dipping in any suitable cleaning solution known to the lamp-making art.
  • a filament having terminals offgreater strength than the main body of the filament are advantageous with a clamping operation they will also bedesirable if the ends of the filament are to be welded or otherwise secured to the leading-in conductors. Since in this case as in the clamping, a sufiicient amount of the pliable portion of the ,wire may be disposed between the clamped portion'and the light giving portion.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wire Processing (AREA)
  • Resistance Heating (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
  • Ropes Or Cables (AREA)
US403396A 1928-12-29 1929-10-30 Coiled lamp filament Expired - Lifetime US1871018A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US403396A US1871018A (en) 1928-12-29 1929-10-30 Coiled lamp filament
GB39066/29A GB339803A (en) 1928-12-29 1929-12-20 Improvements relating to the manufacture of filaments for electric lamps
DEW84599D DE567855C (de) 1928-12-29 1929-12-25 Verfahren zur Erzeugung von Wendeldrahtleuchtkoerpern bestimmter Gesamtlaenge fuer elektrische Gluehlampen
FR687378D FR687378A (fr) 1928-12-29 1929-12-28 Méthode pour obtenir des filaments d'égale longueur pour les lampes ou appareils similaires
NL49599A NL26423C (zh) 1928-12-29 1929-12-28

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US329149A US1865490A (en) 1928-12-29 1928-12-29 Method of producing uniform length filaments
US403396A US1871018A (en) 1928-12-29 1929-10-30 Coiled lamp filament

Publications (1)

Publication Number Publication Date
US1871018A true US1871018A (en) 1932-08-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
US403396A Expired - Lifetime US1871018A (en) 1928-12-29 1929-10-30 Coiled lamp filament

Country Status (5)

Country Link
US (1) US1871018A (zh)
DE (1) DE567855C (zh)
FR (1) FR687378A (zh)
GB (1) GB339803A (zh)
NL (1) NL26423C (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5410007A (en) * 1994-05-31 1995-04-25 General Electric Company Particulated platinum group metal containing silicone resin catalyst, method for making, and use

Also Published As

Publication number Publication date
NL26423C (zh) 1932-04-15
GB339803A (en) 1930-12-18
DE567855C (de) 1933-01-12
FR687378A (fr) 1930-08-07

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