US1756882A - Filament-tensioning means - Google Patents

Filament-tensioning means Download PDF

Info

Publication number
US1756882A
US1756882A US305499A US30549928A US1756882A US 1756882 A US1756882 A US 1756882A US 305499 A US305499 A US 305499A US 30549928 A US30549928 A US 30549928A US 1756882 A US1756882 A US 1756882A
Authority
US
United States
Prior art keywords
filament
uprights
stem
springs
tensioning means
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
US305499A
Other languages
English (en)
Inventor
Walter I Relyea
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.)
General Electric Co
Original Assignee
General Electric 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
Application filed by General Electric Co filed Critical General Electric Co
Priority to US305499A priority Critical patent/US1756882A/en
Priority to FR681436D priority patent/FR681436A/fr
Priority to GB27746/29A priority patent/GB318933A/en
Application granted granted Critical
Publication of US1756882A publication Critical patent/US1756882A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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

  • the present invention relates to electric discharge apparatus and pertains more especially to an improved support for the filamentary cathodes thereof.
  • the cathode In high power space current devices, the cathode usually comprises a filamentary member of substantial cross section and length and under operating conditions there may be considerable elongation of the heated member which may cause sag and. relative displacement with respect to the other electrodes.
  • a spring which serves to tension the member in a longitudinal direction, hence maintaining the latter taut.
  • the excessive heat may deleteriously affect the spring, rendering the material thereof brittle and cause it to lose a substantial portion of its resilience.
  • An object of the present invention is to provide an improved tensioning support for the filamentary cathodeof high power vacuum tubes whereby the space relation between the cathode and other electrodes is maintained uniform despite the linear expansion of the filament during operation.
  • a more general object is to improve the construction of electric discharge devices whereby the latter are accorded greater operating life.
  • Fig. 1 shows an elevational view of a rectifier embodying the improved filament support
  • Fig. 2 is an enlarged view, partly broken away, of the upper portion of the filament supporting structure
  • Fig. 3 is a crosssectional view of the entire filament support
  • FIG. 4 is a view in perspective, partly broken away and in section, of a practical attaching means for the anode of the rectifier, including a convenient method of making a connection with the leading-in wire.
  • numeral 1 designates an evacuated envelop which terminates in two oppositely directed reentrant stems 2 and 3.
  • Numerals 4t, 4 indicate two filament lead wires which project through the stem 2 from suitable contact plugs, an inverted V shaped filament 5 being secured to the upper ends of said leads by fine binding wires 6. Due to the fact that in large power tubes, the lead wires may attain considerable length it is considered preferable to provide an insulating spacer which conveniently may take the form of a quartz block 7 into which are affixed two stifi wires arranged in staggered relation and secured to the filament conductors.
  • a cylindrical cap member 8 having a series of longitudinally and transversely extending slots, said cap member terminating in a circular plate 9 provided with a pair of apertures 10, 10 of relatively large diameter to allow-the filament conductors to pass therethrough with sufiicient clearance.
  • a thin sheet 11 of copper mesh may be interposed between these elements.
  • the plate member 9 serves as a base for two longitudinally extending metallic uprights 12, 12 which terminate some dis tance beyond the filament as shown more clearly in Fig. 2.
  • the ends of the uprights are counterbored to receive small helical springs 13, 1.3, preferably of tungsten, the lengths of which are somewhat less than the depth of the bore.
  • Springs of this type are usually heat treated in an atmosphere of hydrogen at a temperature of 1500 C. approximately so as to impart to them a permanent degree of elasticity.
  • a U-shaped member 14 spans the two uprights and its ends project into the openings of the latter to rest upon the springs.
  • a small helix 16 of tungsten may be wound about the filament and positioned between the latter and member 15, so as to space these elements thereby precluding any weldingeffect at the place of contact between the loop and the heated filament.
  • the helix may, if desired, be affixed to the loop member instead of the filament.
  • the springs tend to take up the movement of expansion by pressing the member 14 away from the stem, hence, the heated member is maintained taut.
  • the spring members serve to endow the filament with con siderable resilience which enables the latter successfully to withstand mechanical jar. It is also to be noted that the springs are removed from the hottest portion of the filament and further, that they are protected in substantial degree from the direct radiation of the latter by reason of the surrounding body of metal forming the upright members.
  • a cylindrical anode 18 of suitable metal may be concentrically mounted about the filamentary cathode by means of a slotted cap 19 which fits over the stem 3 similarly to the corresponding member attached to the cathode.
  • the lower end of the cap may be closed by a metallic plate 20 having a central aperture 21.
  • the plate member carries two longitudinally extending rods 22 which are aiiixed to the anode in any wellknown manner, for example, by welding.
  • the lead 23 for the anode extend from an external plug through the stem and the aperture in the plate to make contact with the cap member 19in any suitable manner.
  • this contact most conveniently may be produced by bringing the lead across the lower surface of the plate and secured by spot-welding in a groove porting the filament under tension, said means comprising a pair of uprights arranged remotely on opposite sides of the filament, a member spanning said uprights, a mechanical conn ction between said member and the filament and springs held under compression positioned between each end of said member and the adjacent upright whereby the springtensioning devices are removed from the region of the filament.
  • an evacuated envelope containing a filament which normally tends to become slack under operating conditions
  • means for maintaining the filament taut said means comprising a plurality of uprights supported from the envelope, a transversely extending member carried by said uprights, connecting means between said transverse member and said filament and a device held under compression positioned between said member and each upright.
  • an evacuated envelope containing a filament which normally tends to become slack under operating conditions, and means for maintaining the filament taut, said means comprising a plurality of recessed uprights supported from the envelope, a spring positioned in each recess, a member spanning the uprights and having its ends located in the recesses in manner such as to place the springs under compression and a mechanical connection between said member and the filament.
  • a filament In an evacuated envelope, a filament, a support therefor comprising a metallic loop member through which the filamentis threaded and to which the filament may normally adhere under operating conditions, means for preventing adherence, said means comprising a spacer between the loop member and the filament.

Landscapes

  • Electron Sources, Ion Sources (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US305499A 1928-09-12 1928-09-12 Filament-tensioning means Expired - Lifetime US1756882A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US305499A US1756882A (en) 1928-09-12 1928-09-12 Filament-tensioning means
FR681436D FR681436A (fr) 1928-09-12 1929-09-07 Perfectionnements aux systèmes de support et de suspension des filaments dans les appareils à décharge électronique
GB27746/29A GB318933A (enrdf_load_stackoverflow) 1928-09-12 1929-09-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US305499A US1756882A (en) 1928-09-12 1928-09-12 Filament-tensioning means

Publications (1)

Publication Number Publication Date
US1756882A true US1756882A (en) 1930-04-29

Family

ID=23181051

Family Applications (1)

Application Number Title Priority Date Filing Date
US305499A Expired - Lifetime US1756882A (en) 1928-09-12 1928-09-12 Filament-tensioning means

Country Status (3)

Country Link
US (1) US1756882A (enrdf_load_stackoverflow)
FR (1) FR681436A (enrdf_load_stackoverflow)
GB (1) GB318933A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431139A (en) * 1943-06-23 1947-11-18 Westinghouse Electric Corp Magnetron

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100672363B1 (ko) 2005-02-18 2007-01-24 엘지전자 주식회사 램프

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431139A (en) * 1943-06-23 1947-11-18 Westinghouse Electric Corp Magnetron

Also Published As

Publication number Publication date
FR681436A (fr) 1930-05-14
GB318933A (enrdf_load_stackoverflow) 1930-12-11

Similar Documents

Publication Publication Date Title
US1756882A (en) Filament-tensioning means
US2680208A (en) Electron discharge device
US2399005A (en) Method of fabricating electric discharge devices
US2194432A (en) Voltage regulator tube
US2160044A (en) Electrode spacer
US2489873A (en) Electric discharge device
US3922578A (en) Large area cathode
US2467390A (en) Filament support for electric space discharge tubes
US1980937A (en) Electron discharge device
US1444438A (en) Electrode structure
US2105507A (en) Electron discharge device
US1456505A (en) Electric discharge device
US2042540A (en) Electrical device
US3312854A (en) Cathode having a u-shaped support member
US1980936A (en) Electron discharge tube
US2105472A (en) High power discharge device
US2352933A (en) Electric discharge device and method of fabrication thereof
US3327157A (en) Cathode unit for electric discharge tubes
US1912006A (en) Electrode clamp
US1872344A (en) Vacuum electric tube device
US2049164A (en) Electric discharge device
US1993804A (en) Thermionic power device
US1984993A (en) Electron discharge device
US1931874A (en) Electron discharge device
US2012129A (en) Nonresonant supporting device