US2686889A - Cathode sleeve - Google Patents

Cathode sleeve Download PDF

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Publication number
US2686889A
US2686889A US199752A US19975250A US2686889A US 2686889 A US2686889 A US 2686889A US 199752 A US199752 A US 199752A US 19975250 A US19975250 A US 19975250A US 2686889 A US2686889 A US 2686889A
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US
United States
Prior art keywords
sleeve
cathode
aperture
mounting
plate
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
US199752A
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English (en)
Inventor
Pilas Frank John
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.)
RCA Corp
Original Assignee
RCA 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 BE507670D priority Critical patent/BE507670A/xx
Priority to NL89871D priority patent/NL89871C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US199752A priority patent/US2686889A/en
Priority to FR1054093D priority patent/FR1054093A/fr
Priority to GB28660/51A priority patent/GB697581A/en
Priority to DER7827A priority patent/DE886044C/de
Application granted granted Critical
Publication of US2686889A publication Critical patent/US2686889A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/26—Supports for the emissive material

Definitions

  • My present invention relates to electron tube electrode assemblies, and more particularly to a sleeve type cathode having a structure for facilitating the mounting of parts forming said assemblies and to a method of mounting a cathode sleeve in an electrode assembly and inserting a heater in said sleeve.
  • Some types of electron tubes include two spaced parallel insulating plates between whichan electrode complement is mounted to form an electrode assembly.
  • a relatively large proportion of such tubes use a cathode of the indirectly heated type comprising a metal sleeve having an electron emissive coating on its outer surface and a resistance heater within the sleeve for energizing the emissive coating.
  • Another object of my invention is tofacilitate the assembly of electrodes in the manufacture of electron tubes.
  • a further object of my invention is to reduce tolerance. requirements in an electrode mounting operation.
  • Another object is to provide a cathode sleeve particularly adapted for mechanized mounting in an electrode assembly.
  • a further object is to provide a cathode sleeve having means for facilitating insertion of a heater provide a cathode sleeve of increased resistance to
  • This structure comprises a sleeve having a taper in one or both end portions thereof.
  • the taper may be provided either in a plane that is inclined with respect to the axis of the sleeve, or peripheral recession of an end of the sleeve, preferably in the form of a helix.
  • the walls of the sleeve at an end portion thereof are partly removed, to effectively enlarge the opening in said end portion of the sleeve.
  • the portion of the sleeve wall in registry with the removed portion serves as a guide for extending a heater therein, for initially entering an aperture in aspacer plate when mounting the sleeve on such plate, and also serves as a rugged integral tab of the sleeve.
  • the taper or peripheral recession referred to results in the formation of a relatively sharp leading edge of the sleeve that is extendable with reduced critical control into weak so that tab deformations frequently sleeve causes it to slide on its tapered or recessed end until a portion of the sleeve proper is completely extended into the aperture in the plate.
  • the taper or recession may be provided at a suitable angle with respect to the sleeve axis to assure a complete mounting of the sleeve on the plate without requiring a damaging magnitude of force for its accomplishment.
  • Figure l is an elevation of one form of cathode sleeve according to the invention.
  • Figure 2 is a view along the line 2-2 of Figure 1, and shows the relatively large opening in an end of the sleeve;
  • Figure 3 is a cross-section along the line il--3 of Figure 1 and shows the normal size of the sleeve
  • Figure 4 shows. a. blank of sheet metal stock from which the sleeve of Figure 1 may be formed
  • Figure 5 is a side elevation of a modified form of cathode sleeve wherein the ends taper continuously from a starting point to a point spaced therefrom longitudinally of the sleeve;
  • Figure 6 is a, cross-section along the line t-i3 of Figure 5.
  • Figure '7 is a blank of sheet metal from which the sleeve of Figure 5 may be formed.
  • FIG. 1 one form of cathode sleeve according. to the invention-
  • the sleeve m is provided with tapered ends ll, i2.
  • Each of the tapers ll, I2 is formed in such a manner that the ends of the sleeve are disposed in planes inclined with respect to the longitudinal axis of the sleeve-
  • .an enlarged opening l3 (Fig. 2) is provided for ease in threading a heater into the sleeve
  • pointed leading ends I l, 85 are formed for facilitating the operation of. mounting. the sleeve on a spacer plate it.
  • the tapered end construction of the cathode sleeve of the invention provides a wall portion ll, the inner surface of which is exposed, that is of advantage in threading a heater into the sleeve Hi.
  • This exposed inner surface is adapted to serve as a backing against which a stranded heater may be placed in orienting its leading end with the interior of the sleeve.
  • the taper results in an enlarged area defined by the-periphery of the end portion, as shown in Figure 2. This area is appreciably larger than the area defined by a normal periphery of the sleeve, as shown in Figure 3. The resultant.
  • enlarged opening in the sleeve further contributes to ease in extending the heater therein. Less critical control of the heater insertion operation is therefore required according to the invention and this permits faster schedules to be adopted. Moreover, mechanized methods of heater insertions are rendered feasible in view of the reduction in tolerance requirements that the sleeve structure permits.
  • the sleeve of the invention is of appreciable aid in mounting the sleeve on an insulating spacer plate.
  • the relatively sharp points l4, l5 resulting from the tapered construction of the sleeve provide ends of relatively small area in respect of the aperture it in the spacer plate It.
  • the step of registering the point IS with the aperture is therefore accomplished with reduced requirements for critically registering the sleeve with the aperture.
  • a satisfactory registration of the pointed sleeve end it with the aperture results when the sleeve is in any one of a number of different positions with reference to the plate it.
  • the position of the sleeve shown in phantom in Figure 1 is.
  • the angle between the planes of tapers I l and i2 and the longitudinal axis of the sleeve is shown to be approximately 45. This angle is satisfactory for most types of sleeves, in that it effectively translates a force applied longitudinally of the sleeve into a movement of the sleeve in a path parallel to the planes of the tapers, without causing buckling. or other deforming dam-.
  • the sleeve is made of relatively thin metal and therefore incapable of receiving thrusts. of even relatively small magnitude during a mounting operation without buckling, the angle between the plane of the tapers and the longitudinal axis of the sleeve may be reduced. In such instance the tapered end 52 will respond in a sliding movement across an edge defining aperture 18, to a longitudinally applied force of sumciently low magnitude for preserving the sleeve from deformation;
  • the end 65 of the sleeve is preferably extended through aperture it under conditions wherein the spacer plate it is held fixed in a suitable jig, not shown, and movement, is ime parted to the sleeve, the end it of the sleeve-is extended into another spacer plate, not shown, preferably while the sleeve is held on' the jig. referred to and the otherspacer plate is moved.
  • longitudinally of the sleeve may be determined by a surface of the jig referred. to.
  • An alternative procedure for. mounting the sleeve on twospaced insulating flats may involve first mounting other electrodes between the plates, as a consequence of which the plates are fixed relative to each other in desiredspace relation.
  • the sleeve l 0 may then be extended through registering. apertures in the plates by a unidirectional movement from one end of the plate array.
  • end I 4 would serve as the leading end of the sleeve, and extension of thesleeve through the plates would proceed until the embcssment through which the sleeve was first extended.
  • the sleeve I0 is formed from fiat sheet metal stock 20 having converging tapers 2
  • points 25, 26 of the tapers result in the formation of the points l4, l5 when the flat stock is rolled to sleeve form as shown in Figure -l. Furthermore, when formed into a sleeve, the side edges of the stock are shaped to providethe lock seam 21 shown in Figures 2 and 3.
  • a modified sleeve structure 28 is shown in Figures 5 and 6.
  • This structure is formed from a fiat sheet metal stock 29 shown in Figure 7, having tapers Bil, 3
  • Thetapersreferred to preferably converge to provide a side 32 of the stock that is spaced longitudinally from the ends 33, 34 formed by the other side 35 of the stock. Therefore, when thestcck 29 is rolled to provide the sleeve shown in Figure 5, the lock seam 36 shown in Figure 6, is spaced from the ends 33, 34.
  • the end portions of the sleeve taper from said ends 33, 3.4 to the location of the lock seam 36 and forman edge inclined with respect to the longitudinal axis of the sleeve.
  • the edge can be thus formed to lie along a helix.
  • the tapered end portions of the sleeve in addition to facilitating the threading of a heater into the sleeve and contributing advantages tothe mounting of the sleeve in an electrode assembly also provides a desired integral cathode tab of increased ruggedness. Any one of the end portions l4, l5 may serve as the tab, depending on its orientation in an electron tube. The ruggedness of both these portions renders any one of them suitable for service as a tab for connection to a lead-in.
  • One of these advantages is manifested in freedom from deformation of the tab during normal handling prior to mounting the cathode in an electrode assembly.
  • Another advantage is the ability of the tab to receive directly the pressure of welding electrodes without damage.
  • a further advantage resides in the fact that the tab is always ina desired position, as
  • the tapers in the ends of thesleeve referred to may be made as steep or flat as required by a sleeve of particular wall thickness and. strength.
  • the sleeve of Figure 5 may also be provided with an embossment 31 which serves a function similar to that of em- ,bossment 19 previously described in connection with Figure l.
  • Each of the cathode sleeves I0 and 28 has a coating 38, 39 of an electron emitting material. This coating is preferably applied after the sleeves are formed from the sheet metal stock 20, 29.
  • a cathode sleeve having a taper extending across one end thereof, said taper providing a leading end of said sleeve of less cross-sectional area than a cross-section ofsaid sleeve, whereby epsasae 7, registry between said snugly receiving said creasedfacility.
  • a 'cathode sleeve of predetermined wall thickness one end of said sleeve having a taper extending angularly thereacross, the angle of said taper with respect to the axis. of saidsleeve.
  • sleeve is effected with inbeing predetermined for force fitting said sleeve.
  • An electron tube electrode assembly including an insulating spacer plate having an opening extending therethrough, and a cathode sleeve exend and a passageway for:
  • S188V8$1D6llldif1 a portionmore remotefrom said plate'than: another portion thereof, and a taper fromv said. portion to said: another portion, whereby said; remoteportion comprises an integral lead for. said cathode having improved resistance to deformation.
  • a cathode sleeve terminating at one end thereof in; an; edge, said edge being co-extensive with a. periphery of said sleeve, and extending in ahclicalzpath axially ofsaid sleeve for facilitating mountingrsaid sleeve in an aperture in an insulating-plate; and for providing. a rugged integral tab onsaid sleeve for connection to a lead-in.
  • a cylindrical sleeve for an, indirectly heated cathode having a seam extending along one side thereof, one end of said sleeve being tapered to provide a. relatively. sharp leading end on said sleeve onset-axially away fromsaid seam, and an embossment adjacent said one end extending transversely of the sleeve for ruggedizing said relatively sharp leading end.

Landscapes

  • Solid Thermionic Cathode (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US199752A 1950-12-08 1950-12-08 Cathode sleeve Expired - Lifetime US2686889A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE507670D BE507670A (xx) 1950-12-08
NL89871D NL89871C (xx) 1950-12-08
US199752A US2686889A (en) 1950-12-08 1950-12-08 Cathode sleeve
FR1054093D FR1054093A (fr) 1950-12-08 1951-11-12 Manchon de cathode
GB28660/51A GB697581A (en) 1950-12-08 1951-12-06 Improvements in cathode sleeves for electron tubes
DER7827A DE886044C (de) 1950-12-08 1951-12-08 Kathodenroehrchen fuer Elektronenroehren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US199752A US2686889A (en) 1950-12-08 1950-12-08 Cathode sleeve

Publications (1)

Publication Number Publication Date
US2686889A true US2686889A (en) 1954-08-17

Family

ID=22738873

Family Applications (1)

Application Number Title Priority Date Filing Date
US199752A Expired - Lifetime US2686889A (en) 1950-12-08 1950-12-08 Cathode sleeve

Country Status (6)

Country Link
US (1) US2686889A (xx)
BE (1) BE507670A (xx)
DE (1) DE886044C (xx)
FR (1) FR1054093A (xx)
GB (1) GB697581A (xx)
NL (1) NL89871C (xx)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1612635A (en) * 1922-09-22 1926-12-28 Verona Tool Works Method of making rail bonds
US2001355A (en) * 1932-06-18 1935-05-14 Patent Button Co Die or anchor for tack buttons
US2029482A (en) * 1934-04-14 1936-02-04 Haslauer Adolf Cathode for thermionic valves
US2324177A (en) * 1942-01-01 1943-07-13 Rca Corp Cathode sleeve
US2536677A (en) * 1944-08-31 1951-01-02 Sylvania Electric Prod Base threading method and apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1612635A (en) * 1922-09-22 1926-12-28 Verona Tool Works Method of making rail bonds
US2001355A (en) * 1932-06-18 1935-05-14 Patent Button Co Die or anchor for tack buttons
US2029482A (en) * 1934-04-14 1936-02-04 Haslauer Adolf Cathode for thermionic valves
US2324177A (en) * 1942-01-01 1943-07-13 Rca Corp Cathode sleeve
US2536677A (en) * 1944-08-31 1951-01-02 Sylvania Electric Prod Base threading method and apparatus

Also Published As

Publication number Publication date
NL89871C (xx)
BE507670A (xx)
DE886044C (de) 1953-08-10
FR1054093A (fr) 1954-02-08
GB697581A (en) 1953-09-23

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