US2521714A - Filament support structure - Google Patents

Filament support structure Download PDF

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Publication number
US2521714A
US2521714A US788785A US78878547A US2521714A US 2521714 A US2521714 A US 2521714A US 788785 A US788785 A US 788785A US 78878547 A US78878547 A US 78878547A US 2521714 A US2521714 A US 2521714A
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United States
Prior art keywords
filament
rods
supporting
platforms
support structure
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
US788785A
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English (en)
Inventor
Goodchild Frank Douglas
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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Filing date
Publication date
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Publication of US2521714A publication Critical patent/US2521714A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/15—Cathodes heated directly by an electric current
    • H01J1/18—Supports; Vibration-damping arrangements

Definitions

  • HPatr-:nt expires Uctoherilgi--l ancianas. (ci. 25m-27.5,)
  • the present invention relates to supporting means for nlaments which are adaptedio be heated by means of electric current passed therefthrough and is directed towards means for preventing distortion of vthe filament. orl filaments carried ⁇ by the said supportingrneans due to unequal thermal, expansion-of Dartslthereoi. lIn
  • the invention is concerned with supporting means which comprise. rodsy which sup*- port the rfilament wire or Wires and which are o f unequal length.
  • Heating' filaments and :the supportingmeans therefor are used to a large extent inelectricy lamps and in electron discharge devices. fIn many of these, ltheiilanflents are carried. by means oftrods which, also supply. the heating current.
  • tc the general: oonstructional iorrnk of the device ofywhich. the mament and its supports form a part, these rods maynot all, be of the same length with the consequence that there is aiterldency' for 'them to be subject todifierent It'hermal elongations WithA lconsequent distortion of the filamentl Wires. It is usually. easierto, compensate' for equal thermaldistortions thanjkfor unequal expansions.
  • the present invention consists in a .supporting meansA for filament or filaments adapted to ⁇ A be heated by means of electric current passed there- ⁇ through and comprisingtiilament supporting rods of unequal length in which said rodsr are secured torigid transverse members'atvsubstantially equil distant distances from; their filament ends and are supported atithe' ends remote ,from they lamenttbinmeans, flexiblyv positioningsaid vrods of unequal length in relation to each other, said rigid transversemembers beinghlocked together to prevent differential thermal extension of said rods with ⁇ respect to lonel another atvtheirr ⁇ filament ends.
  • the invention provides a lamentsup- .porting means for a high power .electron-,discharge .device .comprising a pair of Atubes oi conducting Imaterial, one concentrically within thefothels for supplying v.current to said. ,iIam-ent, said... tubes beinghermetically sealeditoeither.
  • r ⁇ tube l isfprovidedfat itslower end with av ared A;cone"'2*to which is sealed a barrel shaped mem'- .berf 3 of glass@ orf similar vitreous material; "The inner tubularconductor1 ⁇ 5' is similarly sealedv 'to the-othxer end-ot memberi3 at 5r- ⁇ and carriesva platform 6 upon a member closing the "end ofthe tube t.
  • This general form' ofconstructionis descri-bedr4 more fully andfisl claimed i in U; Si Patent -'Non2-,4(i5;359, issued" March' 29;:1'949yt0 T.
  • chors I6 are longer than anchors I'I so that the tops of both sets are at the same height'along" the axis of the assembly.
  • Filment ⁇ wires IQ are Y welded to the anchors I6, II attheir *upper ends N n.partbeing of copper and the other of molyband to molybdenum angle.
  • shaped members I9" at their lower ends. Members I 9 are secured together to form a spectron, held by center piece which has a sliding fit into a collar which may be xed to another part of the discharge device,
  • the rods 'I and 9, however are not of the same length and a diffculty ispresented, particularly if say, some eighteen kilowatts -fof power are to be dissipated by the filament-,and hence the supporting rods are also correspondingly heated.-
  • the platforms I2 and ,I3 Vare equidistant from the lower ends of their -respectivemolybdenum rods.-
  • all the parts below-platforms ;I2 and I3 are constrained to move together, while the resilience ofthe thin copper disc 8 takes up the differential extension ofthe -rods with respect to rods 'I.-
  • the disc 8 may be slotted as smhown.. '.'lhe'method of ylocking theplatforms .26 and v21 are welded to boltV 22 as shown ati28 and 29
  • Filament support structure comprising a 'r'strigid transverse member, a, rst set of lament supporting rods of a given length each Asecured ata given distance from its filament end to saidl 'first rigid transverse member, a
  • Filament supporting means for a high power electron discharge device comprising a pair of concentric tubes of conducting material for supplying current to a filament, a member of vitreous material hermetically sealed between said concentric tubes, ⁇ a first platform of conducting material mounted upon said inner y tube at right angles thereto and adjacent the portion of saidinner tube sealed to said vitreous member, 'a ⁇ first set of filament, supporting rods mountedv on said first platform, ⁇ a thin metallic disc' attached ⁇ to said outer tube near, its junction with said vitreous member, a second setfof relatively Alonger I filament supporting, rods mounted on said disc to compensate for relativevexpansionV ,ofsaid set of longer ⁇ rods, a second 'platform secured to said rstr set of, rods atl a given distance I.from thelament ends of said first set of rods, and a thirdh platform secured to said second set of rods atsaid given distance from the filamentenfds ⁇ of said second 'set of rods, said second and third platforms being
  • Filament supporting means according yto c1aim-4 in which, there areprovided two further platforms, one to each s et of rods, secured theretoadi'acent the filament ends thereof. FRANK DOUGLAS GOODCHILD.

Landscapes

  • Electron Sources, Ion Sources (AREA)
  • Discharge Lamp (AREA)
US788785A 1946-10-16 1947-11-29 Filament support structure Expired - Lifetime US2521714A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB30742/46A GB635981A (en) 1946-10-16 1946-10-16 Improvements in or relating to supporting means for electrically heated filaments

Publications (1)

Publication Number Publication Date
US2521714A true US2521714A (en) 1950-09-12

Family

ID=10312422

Family Applications (1)

Application Number Title Priority Date Filing Date
US788785A Expired - Lifetime US2521714A (en) 1946-10-16 1947-11-29 Filament support structure

Country Status (6)

Country Link
US (1) US2521714A (es)
BE (1) BE477333A (es)
ES (1) ES179745A1 (es)
FR (1) FR957229A (es)
GB (1) GB635981A (es)
NL (1) NL74391C (es)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1965338A (en) * 1930-05-21 1934-07-03 Western Electric Co Thermionic discharge device
US2226680A (en) * 1939-05-09 1940-12-31 Fed Telegraph Co Vacuum tube cathode support
US2298608A (en) * 1939-11-07 1942-10-13 Sperry Gyroscope Co Inc Memory type recorder
US2317222A (en) * 1941-03-20 1943-04-20 Bell Telephone Labor Inc Electron discharge device
US2399004A (en) * 1943-02-12 1946-04-23 Gen Electric Electric discharge device and method of fabrication
US2404042A (en) * 1944-10-12 1946-07-16 Westinghouse Electric Corp Electron discharge device
US2419124A (en) * 1943-11-10 1947-04-15 Westinghouse Electric Corp Insulating means for metallic spacers in electron discharge devices

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1965338A (en) * 1930-05-21 1934-07-03 Western Electric Co Thermionic discharge device
US2226680A (en) * 1939-05-09 1940-12-31 Fed Telegraph Co Vacuum tube cathode support
US2298608A (en) * 1939-11-07 1942-10-13 Sperry Gyroscope Co Inc Memory type recorder
US2317222A (en) * 1941-03-20 1943-04-20 Bell Telephone Labor Inc Electron discharge device
US2399004A (en) * 1943-02-12 1946-04-23 Gen Electric Electric discharge device and method of fabrication
US2419124A (en) * 1943-11-10 1947-04-15 Westinghouse Electric Corp Insulating means for metallic spacers in electron discharge devices
US2404042A (en) * 1944-10-12 1946-07-16 Westinghouse Electric Corp Electron discharge device

Also Published As

Publication number Publication date
ES179745A1 (es) 1947-11-01
FR957229A (es) 1950-02-17
NL74391C (es)
BE477333A (es)
GB635981A (en) 1950-04-19

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