US2980820A - Filament support for an electric lamp or similar device - Google Patents

Filament support for an electric lamp or similar device Download PDF

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Publication number
US2980820A
US2980820A US861861A US86186159A US2980820A US 2980820 A US2980820 A US 2980820A US 861861 A US861861 A US 861861A US 86186159 A US86186159 A US 86186159A US 2980820 A US2980820 A US 2980820A
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United States
Prior art keywords
filament
turns
support member
disc
support
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
US861861A
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English (en)
Inventor
William L Brundige
Raymond M Kane
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 NL258284D priority Critical patent/NL258284A/xx
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US861861A priority patent/US2980820A/en
Priority to GB37687/60A priority patent/GB892545A/en
Priority to FR847828A priority patent/FR1282233A/fr
Application granted granted Critical
Publication of US2980820A publication Critical patent/US2980820A/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
    • H01K1/00—Details
    • H01K1/18—Mountings or supports for the incandescent body
    • H01K1/24—Mounts for lamps with connections at opposite ends, e.g. for tubular lamp

Definitions

  • the locking collar and tongues are formed and caused to curl tightly around and thus grip the inner face of the engaged filament turn by means of a specially shaped tool that is inserted into the filament and pierces the disc after the latter has been positioned transversely on the filament.
  • Another and more specific object of this invention is the provision of a support assembly and member for a coiled filament or the like that will enable the support member to be consistently and positively locked in position on the filament by means of a simple inexpensive operation and maintained in such locked position during the completion and life of the device in which the filament is sealed.
  • the supporting member from material that is greater in thickness than the spacing between the turns of the filament into which it is inserted.
  • the resultant ice spreading of the adjacent turns of the filament causes them to compressively grip and thus firmly clamp the support in the desired transverse position on the filament.
  • Fig. 1 is an elevational view of a tubular heat lamp incorporating the improved filament support assembly of this invention
  • Fig. 2 is an enlarged cross-sectional view along the line II- -Il of Fig. 1, in the direction of the arrows;
  • Fig. 3 is an elevational side view partly in cross-section of a supported portion of the filament and the support member thereat taken along the line III-III of Fig. 2, in
  • Fig. 4 is a fragmentary cross-sectional view on a greatly enlarged scale through one of the supports and several of the adjacent filament turns taken along the line IVIV of Fig. 3, in the direction of the arrows;
  • Fig. 5 is a perspective view on an enlarged scale of a support and the associated portion of the filament, the central section of the filament being omitted to more clearly illustrate the structural details and disposition of the support member;
  • Fig. 6 is a fragmentary elevational view on a reduced scale of a preformed metal strip for facilitating the automatic insertion and assembly of the supports with the filment;
  • Fig. 7 is an elevational view on a reduced scale of another type of support member according to this invention.
  • Fig. 8 is a fragmentary perspective view of another form of support and associated segment of the filament.
  • While the present invention may be advantageously employed in various types of electrical devices that have a coiled member which requires an auxiliary means of support, it is especially adapted for use with tubular heat lamps having a coiled filament of refractory wire and has accordingly been so illustrated and will be so described.
  • a tubular heat lamp 10 comprising a quartz envelope 12 of relatively small diameter closed at each end by a press seal 17 and containing a heat generating element such as a linear filament 14 that is spaced from and extends axially within the envelope.
  • the filament 14 comprises a plurality of equally spaced turns of refractory metal wire such as tungsten for example andis centrally positioned within the envelope 12 by .
  • a plurality of transversely extending wafer-like support members such as discs 20 of tantalum or other suitable refractory material that are inserted between adjacent turns of and are anchored to the filament at preselected points along its length.
  • Lead-in conductors 16 embedded in each of the press seals 17 and fastened to the ends of the filament 14 keep the latter taut and straight and connect it by means of the usual ribbon-and-outer-lead assemblies to sleeve-like base members 18 mounted on each of the press seals.
  • a detailed description of this type lamp is given in US. Patent No. 2,864,025 dated December 9, I958.
  • each of the discs 20 are split by an opening such as a slot 22 that extends radially inward from the periphery to approximately the center of the disc where it merges with an enlarged aperture 26 thereat.
  • the discs 20 are preferably contoured to provide an outwardly tapered or flared entrance 24 into the slot 22 so as to facilitate the insertion of the discs into the filament 14.
  • the discs 20 When assembled with the filament 14 the discs 20 are so disposed that the aperture 26 at the inward terminus of the slot 22 is centrally located within the interior of the filament and a portion of one of the adjacent filament turns passes through the slot, as illustrated in the aforesaid figures.
  • the support discs 20 are so designed that when inserted between adjacent turns of the filament 14 they spread them apart and are, in turn, elastically gripped and firmly clamped thereby transversely of the filament axis. As shown more particularly in Fig. 4, this coaction between the aforesaid elements is achieved by correlating the finished dimensions of the filament 14 and the thickness of the refractory sheet material from which the discs are made.
  • the aforesaid parts are so dimensioned that the minimum thickness (T of the discs 20 is greater than the spacing between turns (S of the filament 14, that is, T S
  • T S This requirement, expressed in terms of the design parameters of the filament, is defined by the following expression: P D +T where P is the pitch of the filament 14 and D the diameter of the wire from which it is wound.
  • P is the pitch of the filament 14 and D the diameter of the wire from which it is wound.
  • the aforesaid expressions are equivalent since S is equal to PD;.
  • the desired compressive clamping of the support members can be achieved by keeping one of the variables constant and properly correlating the others.
  • Table 1 Examples Variant I II III IV Lamp Wattage 500 1000 2500 1350 Turns Per Inch (t.p.i.) of the filament (finished) 98. 0 98. 0 93. 0 101.0 Diameter (Dr) of filament wir in inches 00910 00910 .00981 .00876 Minimum thickness (T of support memberlninches .00200 .00200 .00200 .00200 01110 01110 .01181 .01076 1 01020 01020 .01075 .00990 t.p.i.
  • auxiliary locking projections such as a plurality of toothlike burrs 28 at the margin of the aperture 26 to obviate any possibility whatsoever that the discs will inadvertently be displaced by an excessive amount laterally from their inserted positions during rough handling prior to or during the placement of the filament-and-disc assembly into the envelope 12.
  • the burrs 28 protrude transversely into the interior of the filament 14 from one side of the disc 20.
  • the aforesaid burrs are not wrapped tightly around and do not grip the adjacent filament turn but are merely disposed proximate thereto and are, in fact, normally spaced from the inner surface thereof.
  • the aperture 26 and burrs'28 may be formed by a piercing tool after the discs have been inserted into the filament in a manner similar to that disclosed in the aforesaid U.S.
  • the support discs 20 may be automatically inserted into and assembled with the filament 14 by providing a preformed metal strip 30 such as that shown in Fig. 6.
  • the strip 30 is slightly wider than the diameter of the discs 20 and is adapted to be sequentially inserted into the filament 14 and the discs formed in situ thereon by a suitable apparatus such as that disclosed in US. Patent No. 2,813,327 dated November 19, 1957.
  • Fig. 7 there is illustrated another form of disc 200 having a plurality of slits '32 that extend radially from the inward terminus of the'opening 22a and define a plurality of triangular-shaped tabular segments 28a that can be very conveniently bent to provide the auxiliary locking projections referred to above.
  • the auxiliary locking elements are preformed, so to speak, and need only be displaced outwardly from the disc thereby eliminating the step of forming the projections in situ on the filament and further simplifying lamp manufacture.
  • auxiliary locking means comprise a plurality of radially spaced projections such as tabs 34 that extend transversely from one or both sides of the disc and are thus disposed to engage the outer surface of the adjacent turn or turns thereat.
  • the disc 20b is prevented from slipping laterally oif the filament 14 by auxiliary locking elements that are formed from portions of the disc that lie beyond the part thereof that is interposed between the adjacent turns of the filament rather than from said interposed part as in the case of discs 20 and 20a described above.
  • the slot 22b in disc 2% can be of uniform width at its inward terminus and the tabs 34 formed by a suitable tool that is located outside of rather than within the filament.
  • the auxiliary locking means may comprise a plurality of radially spaced dimples or indents 36 such as those shown in dotted outline in Fig. 4. As illustrated, the aforesaid indents are disposed proximate and thus adapted to seat against the outer surface of the adjacent filament turnor turns and prevent the 'disc from slippin laterally from its inserted position.
  • a support member of refractory sheet material having an opening that extends inwardly from its periphery, said support member being inserted between adjacent turns of said filament and disposed transversely of said filament so that a part of one of said adjacent turns passes through said opening, said support member in the region interposed between said adjacent filament turns having a thickness greater than the spacing between said turns and, by virtue of the resultant spreading of said turns, being firmly gripped and compressively clamped thereby and prevented from being rotatively or laterally displaced from its inserted position on said filament.
  • a support member of refractory sheet material having an opening that extends inwardly from its periphery, said support member being inserted between adjacent turns of said filament and disposed transversely of said filament so that a part of one of said adjacent turns passes through said opening, said support member being greater in thickness than the spacing between said adjacent filament turns by an amount such that said support member, by virtue of the resultant spreading of said turns, is firmly gripped and compressively clamped thereby and prevented by such clamping from being rotatively or laterally displaced from its inserted position on said filament even when the latter is mounted under tension and is thus slightly distended.
  • a support member of refractory sheet material having an opening that extends inwardly from its periphery, said support member being inserted between adjacent turns of said filament and disposed transversely of said filament so that the inward terminus of said opening is located within the interior of said filament and a part of one of said adjacent turns passes through said opening, said support member in the region interposed between said adjacent turns having a thickness greater than the spacing between said turns and, by virtue of the resultant spreading of said turns, being firmly gripped and compressively clamped thereby in its inserted position and prevented from rotating about the axis of said filament, marginal portions of said support member at the inward terminus of said opening being bent into the interior of said filament and constituting projections that extend transversely from one side of said support member and are adapted to seat against the inner surface of the filament turn thcreat and to prevent the excessive lateral displacement of said support member should the latter accidentally be subjected to
  • a metal support disc having a slot that extends radially inward from its periphery and merges with a centrally-located aperture, said disc being inserted between adjacent turns of said filament and positioned transversely thereof so that said aperture is substantially centered within the interior of said filament and a part of one of said adjacent filament turns passes through said slot, the thickness of said support disc being greater than the spacing between turns of said filament by an amount such that said disc, by virtue of the resultant spreading of said adjacent turns, is firmly gripped and compressively clamped thereby in its inserted position and prevented from rotating about the axis of said filament even when said filament is mounted under tension and is thus slightly distended, a plurality of tooth-like burrs at and protruding from the margin of said aperture and a side of said disc into the interior of said filament, said burrs being disposed to seat against the inner surface of the filament turn thereat and
  • a support member of refractory sheet material having an opening that extends inwardly from its periphery, said support member being inserted between adjacent turns of said filament and disposed transversely of said filament so that a part of one of said adjacent turns passes through said opening, said support member in the region interposed between said adjacent turns having a thickness greater than the spacing between said turns and, by virtue of the resultant spreading of said turns, being firmly gripped and compressively clamped thereby in its inserted position and prevented from rotating about the axis of said filament, portions of said support member beyond the part thereof interposed between said adjacent turns being displaced from the body of said support member and constituting projections that extend transversely therefrom toward the outer surface of at least one of the adjacent filament turns and are adapted thereby to seat against said filament turn and prevent the excessive lateral displacement of said support member should the latter accidentally be sujected to a displacing force greater than the compressive clamping
  • a support member adapted to be inserted into a coiled filament of refractory metal wire having a plurality of precisely spaced turns, said support member comprising a wafer-like body of refractory material having a thickness greater than the spacing etween the adjacent turns of said filament into which it is to be inserted, an opening in said body extending inwardly from the periphery thereof and adapted to receive a part of one of said adjacent turns of said filament, and a plurality of slits in said body that extend radially from the inward terminus of said opening and define a plurality of triangular-shaped tabular segments displaceable from the plane defined by said body into the interior of said filament when said support member is in its inserted position thereon.

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  • Electron Sources, Ion Sources (AREA)
US861861A 1959-12-24 1959-12-24 Filament support for an electric lamp or similar device Expired - Lifetime US2980820A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL258284D NL258284A (xx) 1959-12-24
US861861A US2980820A (en) 1959-12-24 1959-12-24 Filament support for an electric lamp or similar device
GB37687/60A GB892545A (en) 1959-12-24 1960-11-02 Filament support for an electric lamp or similar device
FR847828A FR1282233A (fr) 1959-12-24 1960-12-23 Support de filament pour lampe électrique ou appareil similaire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US861861A US2980820A (en) 1959-12-24 1959-12-24 Filament support for an electric lamp or similar device

Publications (1)

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US2980820A true US2980820A (en) 1961-04-18

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GB (1) GB892545A (xx)
NL (1) NL258284A (xx)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3195001A (en) * 1961-03-17 1965-07-13 Gen Electric Tubular incandescent lamp
US3327041A (en) * 1964-04-30 1967-06-20 Sylvania Electric Prod Radiant heat reflecting device
US3443144A (en) * 1964-12-31 1969-05-06 Sylvania Electric Prod Infrared incandescent lamp
US3486001A (en) * 1968-02-05 1969-12-23 Stanley R Czarnowski Vapor deposition material support
JPS477753Y1 (xx) * 1966-09-08 1972-03-23
US3930178A (en) * 1973-07-10 1975-12-30 Thorn Electrical Ind Ltd Electrical incandescent filament devices
US4598194A (en) * 1983-03-24 1986-07-01 Thorn Emi Plc Quartz infra-red lamps
US6591062B2 (en) * 2000-06-21 2003-07-08 Heraeus Noblelight Gmbh Infrared radiator with carbon fiber heating element centered by spacers
EP1511360A2 (de) * 2003-08-27 2005-03-02 Heraeus Noblelight GmbH Infrarotstrahler, seine Verwendung sowie ein Verfahren zu dessen Herstellung
DE102007008696B3 (de) * 2007-02-20 2008-10-02 Heraeus Noblelight Gmbh Infrarotstrahler mit opakem Reflektor und seine Herstellung
US11462396B2 (en) * 2013-09-05 2022-10-04 Applied Materials, Inc. Lamp cross-section for reduced coil heating

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2042540A (en) * 1930-07-21 1936-06-02 Gen Electric Electrical device
US2813993A (en) * 1954-09-17 1957-11-19 Gen Electric Electric lamp or similar device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2042540A (en) * 1930-07-21 1936-06-02 Gen Electric Electrical device
US2813993A (en) * 1954-09-17 1957-11-19 Gen Electric Electric lamp or similar device

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3195001A (en) * 1961-03-17 1965-07-13 Gen Electric Tubular incandescent lamp
US3327041A (en) * 1964-04-30 1967-06-20 Sylvania Electric Prod Radiant heat reflecting device
US3443144A (en) * 1964-12-31 1969-05-06 Sylvania Electric Prod Infrared incandescent lamp
JPS477753Y1 (xx) * 1966-09-08 1972-03-23
US3486001A (en) * 1968-02-05 1969-12-23 Stanley R Czarnowski Vapor deposition material support
US3930178A (en) * 1973-07-10 1975-12-30 Thorn Electrical Ind Ltd Electrical incandescent filament devices
US4598194A (en) * 1983-03-24 1986-07-01 Thorn Emi Plc Quartz infra-red lamps
USRE40181E1 (en) * 2000-06-21 2008-03-25 Heraeus Noblelight Gmbh Infrared radiator with carbon fiber heating element centered by spacers
US6591062B2 (en) * 2000-06-21 2003-07-08 Heraeus Noblelight Gmbh Infrared radiator with carbon fiber heating element centered by spacers
EP1511360A2 (de) * 2003-08-27 2005-03-02 Heraeus Noblelight GmbH Infrarotstrahler, seine Verwendung sowie ein Verfahren zu dessen Herstellung
EP1511360A3 (de) * 2003-08-27 2007-08-29 Heraeus Noblelight GmbH Infrarotstrahler, seine Verwendung sowie ein Verfahren zu dessen Herstellung
US20050047766A1 (en) * 2003-08-27 2005-03-03 Sven Linow Infrared radiation source, use of same, and a method for its manufacture
DE102007008696B3 (de) * 2007-02-20 2008-10-02 Heraeus Noblelight Gmbh Infrarotstrahler mit opakem Reflektor und seine Herstellung
US20100117505A1 (en) * 2007-02-20 2010-05-13 Heraeus Noblelight Gmbh Infrared emitter comprising an opaque reflector and production thereof
US8210889B2 (en) 2007-02-20 2012-07-03 Heraeus Noblelight Gmbh Infrared emitter comprising an opaque reflector and production thereof
US11462396B2 (en) * 2013-09-05 2022-10-04 Applied Materials, Inc. Lamp cross-section for reduced coil heating

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Publication number Publication date
NL258284A (xx)
GB892545A (en) 1962-03-28

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