US3200855A - Method of making tension grid - Google Patents

Method of making tension grid Download PDF

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Publication number
US3200855A
US3200855A US105351A US10535161A US3200855A US 3200855 A US3200855 A US 3200855A US 105351 A US105351 A US 105351A US 10535161 A US10535161 A US 10535161A US 3200855 A US3200855 A US 3200855A
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US
United States
Prior art keywords
coiling
grid
wire
strut
transverse members
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
US105351A
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English (en)
Inventor
Wenzel Ehrhard
Marquardt Gunter
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Application granted granted Critical
Publication of US3200855A publication Critical patent/US3200855A/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
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • H01J2893/0023—Manufacture carbonising and other surface treatments
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • H01J2893/0025—Manufacture by winding wire upon a support

Definitions

  • the present invention relates generally to the production of tension grids for electric discharge tubes, and more particularly to a process and mechanism for fastening the ends of the coiling wire to the tension frame which includes two struts and two transverse members, each connecting the struts at two opposed positions.
  • frames are generally used which comprise two struts or rods and four transverse members connecting these two struts with one another. .Both the struts and the transverse members are usually made of molybdenum.
  • grids are produced today wherein the struts have a diameter of 0.8 mm. and the coiling wire of the grid has a diameter of 0.008 mm.
  • the grid wire is put onto these frames with a tension corre sponding to about '70 to 80 percent of the tear strength of tungsten.
  • the coiling process ordinarily starts about five to six windings before and ends about two to six windings after the coiling space proper has been covered or filled with windings.
  • the windings and the ends of the coiling wire are fixed with glass paste and subsequently annealed at about 800 C.
  • the additional windings placed onto the ends of the grid frame must then be unwound so that actually only the portion of the grid frame between the transverse members is covered with grid windings.
  • This unwinding of the ends of the grid wire is an extraordinarily difficult operation when using, for eX ample, a tungsten wire having a thickness of 0.008 mm.
  • Such a grid coiling wire cannot be seen with the naked eye and the coiling operator must therefore carry out the removal of the coiling wire ends under an eyepiece.
  • An object of the present invention is to simplify the manufacture of such grids.
  • Another object of the invention is to provide a tension grid which may be manufactured without welding the thin grid wire.
  • a further object of the invention is to provide a method, article and apparatus which are simple yet exceedingly effective for the purposes for which they have been designed.
  • the method of which comprises placing the end of the coiling wire between one leg of a transverse member and the respective strut before the start of the coiling process, and subsequently bending the free leg of the transverse member onto the strut to clamp the end of the coiling wire.
  • the transverse members are connected with the struts by welding.
  • FIGURE 1 is a fragmentary elevation of a part of a tension grid produced by the process of the invention.
  • FIGURE 2 is a side elevation of the grid during an initial step in the process.
  • FIGURE 3 is a side elevation similar to FIGURE 2 illustrating the pins 6 and the final position of the ends of the transverse members, in dotted lines.
  • FIGURE 4 is a side elevation of the finished grid.
  • the two spars or struts of the grid are designated as 1 and 2 and the transverse members are designated as 3 which are connected at welds 9.
  • end 5 of the grid coiling wire 4 is placed between one leg of the transverse member 3 and the strut 1.
  • a tool shown in FIGURE 3 consisting of two pins 6, the ends of the transverse members are subsequently bent in the direction of the strut 1 in such manner as to clamp end 5 of the coiling wire.
  • the two pressure pins 6 move in the direction of the two arrows shown.
  • the front edges of the two pressure pins are so designed as to bend oif the ends of the transverse members in such a way as to cause them to closely engage the arcuate surface of the strut 1. This position of the ends of the transverse members is shown in FIGURE 3 by dashed lines and designated as 7.
  • pins 6 may be accomplished in any desired manner.
  • pin guiding blocks'13 may be mounted near or on the grid coiling machine.
  • the blocks have guide openings 10 formed therethrough in which pressure pins 6 are slidably movable.
  • the piston rods 11 of hydraulic cylinders 12 are connected to pins 6 and when the cylinders are actuated to extend their piston rods the pins 6 are moved toward each other while when their piston rods are retracted, the pins 6 are moved away from each other.
  • FIGURE 4 shows a completely coiled grid viewed from the front side.
  • the clamp wire end may be seen from this figure.
  • a method of fastening the ends of the coiling wire to the tension frame including two struts and two transverse members each connecting the struts at two opposed locations, the improvement comprising the steps of: placing the end of the coiling wire between one leg of a transverse member and the respective strut prior to initiating the coiling process; and subsequently bending the free legof the transverse member onto the strut to clamp the end of the coiling wire.
  • a grid coiling machine for clamping a coiling wire to a tension frame including a strut and two transverse members having projecting portions, an assembly for clamping the coiling wire between the strut and one of said transverse members, a guide cooperable with said assembly and mountable on the machine for movement making possible the clamping of the end of the coiling wire before the beginning of each coiling cycle.
  • a method of clamping a coiling wire to a tension frame having a strut and two transverse members connected at opposed points to the strut and having projecting portions comprising the steps: placing an end of the coiling wire between the projecting portion of a transverse member and the strut, and then bending the projecting portions of the transverse members against the strut to clamp the coiling wire therebetween.
  • Means for retaining the coiling wire of a tension grid for electric discharge tubes in place comprising, in combination: a strut; two transverse members connected thereto at opposed points and having portions projecting beyond said strut; two pressure pins in alignment with the projecting portions of said transverse members with one disposed on each side thereof; and meansfor moving said pins toward said strut to bend the projecting portions against the strut to clamp a coiling wire therebetween.

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  • Wire Processing (AREA)
US105351A 1960-05-10 1961-04-25 Method of making tension grid Expired - Lifetime US3200855A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET18353A DE1113036B (de) 1960-05-10 1960-05-10 Verfahren zum Befestigen der Wickeldrahtenden eines Spanngitters

Publications (1)

Publication Number Publication Date
US3200855A true US3200855A (en) 1965-08-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US105351A Expired - Lifetime US3200855A (en) 1960-05-10 1961-04-25 Method of making tension grid

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US (1) US3200855A (de)
DE (1) DE1113036B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263710A (en) * 1963-08-07 1966-08-02 Gen Electric Apparatus and method for fabricating frame grids
US3366828A (en) * 1964-04-30 1968-01-30 Philips Corp Frame grid having the ends of the grid wires connected in a hook formed on the end of each grid bar

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166387B (de) 1960-10-31 1964-03-26 Rca Corp Spanngitter fuer Elektronenroehren und Verfahren zum Befestigen eines Gitterdrahtes an einem Spanngitter
NL267331A (de) * 1961-07-20

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2853104A (en) * 1954-02-26 1958-09-23 Westinghouse Electric Corp Method of manufacturing grid electrodes
US2960621A (en) * 1958-03-06 1960-11-15 Siemens Edison Swan Ltd Thermionic valve grids
US3001555A (en) * 1957-12-13 1961-09-26 Gen Electric Automatic grid making machine
US3013176A (en) * 1959-02-17 1961-12-12 Int Standard Electric Corp Thermionic valves
US3054430A (en) * 1956-06-13 1962-09-18 Philips Corp Grid structure for electron discharge tubes
US3081800A (en) * 1959-03-31 1963-03-19 Sylvania Electric Prod Frame grid

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH313050A (de) * 1952-08-02 1956-03-15 Siemens Ag Verfahren zur Herstellung von Spanngittern für Entladungsröhren
DE1030466B (de) 1954-03-05 1958-05-22 Siemens Ag Verfahren zur Herstellung einer Gitterelektrode fuer elektrische Entladungsgefaesse,insbesondere nach Art eines Spanngitters
DE1716892U (de) * 1954-03-16 1956-02-16 Siemens Ag Gitterelektrode fuer elektrische entladungsgefaesse, insbesondere nach art eines spanngitters.
DE1041604B (de) 1956-03-23 1958-10-23 Siemens Ag Verfahren zum Verbinden der Wickeldrahtenden mit dem Spannrahmen bei Spanngittern fuer elektrische Entladungsgefaesse
DE1033790B (de) 1956-06-13 1958-07-10 Philips Nv Verfahren zur Herstellung von Gittern mit straff gespannten Draehten fuer elektrische Entladungsroehren und nach diesem Verfahren hergestelltes Gitter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2853104A (en) * 1954-02-26 1958-09-23 Westinghouse Electric Corp Method of manufacturing grid electrodes
US3054430A (en) * 1956-06-13 1962-09-18 Philips Corp Grid structure for electron discharge tubes
US3001555A (en) * 1957-12-13 1961-09-26 Gen Electric Automatic grid making machine
US2960621A (en) * 1958-03-06 1960-11-15 Siemens Edison Swan Ltd Thermionic valve grids
US3013176A (en) * 1959-02-17 1961-12-12 Int Standard Electric Corp Thermionic valves
US3081800A (en) * 1959-03-31 1963-03-19 Sylvania Electric Prod Frame grid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3263710A (en) * 1963-08-07 1966-08-02 Gen Electric Apparatus and method for fabricating frame grids
US3366828A (en) * 1964-04-30 1968-01-30 Philips Corp Frame grid having the ends of the grid wires connected in a hook formed on the end of each grid bar

Also Published As

Publication number Publication date
DE1113036B (de) 1961-08-24

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