US2943904A - Current limiter - Google Patents
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- US2943904A US2943904A US800734A US80073459A US2943904A US 2943904 A US2943904 A US 2943904A US 800734 A US800734 A US 800734A US 80073459 A US80073459 A US 80073459A US 2943904 A US2943904 A US 2943904A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/24—Testing of discharge tubes
- G01R31/25—Testing of vacuum tubes
Definitions
- This invention relates to electron tube manufacturing and in particular to the aging of electron tubes.
- the heating of the tube causes a permanent increase in the minor diameter of the grid, with a permanent increase of spacing between the screen grid and control grid.
- This increase in spacing reduces the anode current that would otherwise iiow through the tube and correspondingly changes other characteristics of the tube, such as trans-conductance and screen grid current.
- the reduction in current flow is desirable, sincethe tubes, prior to aging, have widely diierent characteristics; but, by aging the tubes, the top level of anode current in all of them are reduced to a lower level, thereby reducing the spread above an arbitrarily designated lower level of current.
- tubes with more uniform characteristics than prior to aging are produced.
- VAnother object of the invention is to provide a system whereby although a group of tubes is'treatedi'for lower-v ⁇ ing the cathode current therein, the treatment of each tube Yis, individually controlled to bringabout a substantially.. equal cathode current in each of the tubes.
- Fig. l Yis a diagrammatic vertical view of the aging rack Patented July 5, 1960 employed in the invention, with a conveyor about the rack.
- Fig. 2 is a fragmental plan view of one of the bars used on the conveyor.
- Fig. 3 is a fragmentary portion of the underface of the bar.
- Fig. 4 is an end View of the bar.
- Fig. 5 is a wiring diagram of the circuitry involved in the invention and Fig. 6 is a view of a type of tube which into the sockets on the bars.
- Fig. l there is diagrammatically illustrated a conveyor frame 10, around whichtravels a conveyor 11 of two spaced parallel chains 1,2 (only one chain being shown) running in the direction of the arrow and havingV a vertical ascending side 13, an upper horizontal run V14, a -vertical descending side 16 and a lower horizontal run 18.
- 'Ihese chains are driven intermittently, for example one step every twenty five seconds, by a Geneva drive 20 whose drive shaft 22 may be variably driven, as through a Reeves transmission, not shown, to vary the timing of intermittent movement ofthe conveyor.
- V Spanning the chains are bars 24, each provided with a number of tube receiving sockets 26.
- each bar of which there may be one hundred and fourteen, is provided with nine sockets 26, each adapted forcee-ive a tube, as tube 28, eachV socket being provided with seven contacts 30 to correspond with the pins 32 on the tube.
- Each of the ascending and descending sides of the conveyor may accommodate nineteen of the bars and the lower and horizontal runs may each accommodate thirty eight bars.
- the sockets are loaded with tubes to be aged at the loading station at the right of Fig. 1 at about the third indexed position of the bar from the bottom run, and the tubes are removed at the unloading station on the descending run of the conveyor at about the third bar may be plugged above the bottom run.
- socket contacts are brought to the lower faces of theLA bars 24 wherein printed circuitry 40, similar for each socket, leads the contacts to a row of shoes 42 mounted on the bar to correspond with the lateral spacing of the fixed spring contacts.
- the nine wires leading to corre,- sponding shoesV on each socket, as for example, the anode k connected shoes, are connected into a bundle 44, each bundle leading to the terminals of a polarized plug 46. 'Ihe plugs from one bar all lead to a plug-in panel 50.' Each panel has seven plug sockets 52 to respectively receive the pins lof the plugs.
- Each of the contacts of the plug-in sockets is fed with individually regulated current.
- each contact of the sockets on the bars can be fed with any desired voltage at any desired indexed position of the bars.
- This allows Vfor extreme exibility in aging of the tubes.
- the wires from the spring contacts are differently bundled# .upon the current ow.viathe, screen:grid.andthe-poten- Herefthe seven wires originating Vfrom a Vsocket are made into a group, as group 58, and the nine groups of wires 58 from the nine sockets are fed to a relay box 60 Within which .are nineprelays 62, seeFig. 5, and associated equip Vment, as will be described.
- Each relay comprises. an: 5
- a wire 80 connects movable arm 76Lw-ith Ythe springcontact 381 leading to. they anodecf4 atube.
- A'4 wire- 82 connects movable arm 78 with-a spring contact 38fleading to the V#t l'iorf'co'ntrolgrid ofthe same tub'ei
- a wire 84 Y connects :ft2Y grid-lori? ⁇ screen spring ⁇ VContact Eliand re;
- lay contact 66 ⁇ A ⁇ wie 86 connects cathode Vspringl contact- 38 ⁇ and relayA contact 72.
- The'heater'wires 87, 88 lead from springcontacts 3 8VV to a variablevtransformer 90 soI as to feed'any ⁇ desired-volt'age-to ⁇ the heater, and a suppressor grid springfcontact connectedv wire 92V leadsto one-side of a Vclosed switch 94 Whicli'switch is. connected atv its-,other side to the cathode lead 86.
- the contact 68V isegroundedwhile the contact 70 is open circuited; 25
- tube 104 may'V be indicated by a high resistance indi- ⁇ cating lampV as'a neon lamp 110 inrsh'unt with the-tubev l104'and its potentiometer-.102.. g
- the current detecting means need 'Y not necessarily-be. af,-gas'.lledi tube sinceicontact making meters and other than gas filled; grid controlled tubes 5 can be used as Well, as triodes with' A.C. supply to the anode.
- V.thefcom-Lrk -binatidn. comprising aconveyorV frame, ang indexiblel conveyorV on the frame, bars carriedrby'the conyeyor; ⁇ andk tube socketsl for said tubes on each gbar, contacts on each bar. Wiredto individual contacts, in thetube:
- a machine for aging electron tubes having a cathode, control grid, screen grid and anode
- the combination comprising a conveyor lframe, an indexible conveyor on said frame, bars carried by the conveyor and tube sockets for said tubes on each bar, contacts on each -bar wired to individual contacts in thertube sockets, contacts mounted on the conveyor frame, one for each contact on the bars at each of a multiplicity of positions of the bars, said frame mounted contacts being connected individually to individual sources of voltage, the contacts on the frame at one position of the bars leading to relay mechanism, switching means forming part of said mechanism for normally establishing Va current flow from screen grid to cathode within tubes in the sockets, said relay mechanism comprising a coil in series with a self biasing grid controlled tube having a resistor in its grid circuit, an armature controlled by the coil, a contact movable with the armature in a first position to tie together the screen grid of the tube being aged and its associated anode and in a second position to disconnect the two, a second contact mov
- a machine for aging electron tubes having a cathode, control grid, screen grid and anode
- the combination comprising a conveyor frame, an indexible conveyor on said frame, bars carried by the conveyor and tube sockets for said tubes on each bar, contacts on each bar wired to individual contacts in the tube sockets, contacts mounted on the conveyor frame, one for each contact on the bars at each of a multiplicity of positions of the bars, said frame mounted contacts being connected individually to individual sources of voltage, the contacts on the frame at one position of the bars leading to relay mechanism, a coil and switching means forming part of said relay mechanism for normally establishing a current ow from screen gridA to catho'de Within. tubes in the sockets, said relay mechanism including a'source of D.C.
- a relay having a rst, idle, front contact and a second front contact connected to the cathode of the tube, a third, back contact connected to the source o'f D.C. voltage and to the screen grid, a fourth, backcontact connected to ground and an armature having two poles a first one of which is movable between the first and third contacts and the second one of which is movable between the second and fourth contacts, said rst pole being connected to the anode and the second pole to the control grid, a grid controlled gas filled tube in series with the coil, means to break the current o'w through the gas filled tube, said gas lled tube having a resistance in series with the cathode and ground and biasedly connected at a non cathode connected portion of the resistance with its control grid, and a connection between the resistance intermediate of its length and the second front contact.
- a conveyor frame for aging electron t-ubes having a cathode, control grid, screen grid and anode
- the combination comprising a conveyor frame, an index'ible conveyor on said frame, bars carried by the conveyor and tube sockets for said tubes on each bar, contacts on each bar wired to individual contacts in the tube sockets, contacts mounted on the conveyor frame, one for each contact on the bars at each of a multiplicity of positions of the bars, said frame mounted contacts being connected individually to individual sources of voltage, the contacts on the frame at one position of the bars leading to relay mechanism, switching means forming part of said'mechanism for normally establishing a current ow from screen grid to cathode within tubes in the sockets, said relay mechanism comprising a coil responsive to the magnitude of said current iow and operative upon an armature having contacts, said contacts in one position of the armature connecting the screen grid to an idle contact and in another position of tue armature connecting the screen grid to the ano'de, said screen grid, in both positions of the arma
- a system for controllably agingelectron tubes having a cathode, a control grid, a screen grid and an anode,
- said system including a source of D.C. voltage, a relay having a coil, a tirst, idle, front contact and a second, front contact connected to the cathode of the tube, a third, back contact connected to the source of D.C.
- a fourth, back contact connected to ground and an armature having two poles a first one of which is movable between the first and third contacts and the second one of which is movable between the second and fourth contacts, said first pole being connected to the anode and the second pole to the control grid, a grid controlled gas lled tube in series with the coil, means to break the current ow through the gas lled tube, said gas filled tube having a resistance in series with the cathode and ground and biasedly connected at a non cathode connected portion'of the resistance with its control grid, and a' connection between the resistance intermediate of its length and the second, front contact.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Description
July 5, 1960 c. J. BussM ErAx. 2,943,904
CURRENT LIMITER Filed March 20 ,l 1959 2 sheets-sheet 1 QIUUUUI INV ENTOR ATTORNEY July 5, 1960 c. J. BussoM ETAL 2,943,904
CURRENT LIMITER Filed March 20, 1959 l 2 Sheets-Sheet 2 ATTORNEY CURRENT LIMITER Charles J. Bussom, Fairmount City, and Donald L. Say, Brookville, Pa., assignors to Sylvania Electric Products Inc., a corporation of Delaware Filed Mar. 20, 1959, Ser. No. 800,734
7 Claims. (Cl. 31'6-27) This invention relates to electron tube manufacturing and in particular to the aging of electron tubes.
It is common practice in the art, after the parts of a tube have been assembled and sealed within an air exhausted envelope, to transfer the tubes to an aging rack, usually in the form of a conveyor having bars with tube sockets thereon and wherein the tubes inserted in the sockets are heated by application of abnormally high voltages to the iilamentary heater and other electrodes within the tube. The eiect of this heating is to raise the temperature of the parts within the tube to higher than temperatures they would be subjected to in normal use, and, by controlling the heating, permanent changes are effected in the geometrical conguration in the electrodes within the tube. In the particular case of the second or screen grid, if the grid be elliptical, rectangular or. of other'shape displaying major and minor diameterswith the minor diameter perpendicular to the active face of the cathode, the heating of the tube causes a permanent increase in the minor diameter of the grid, with a permanent increase of spacing between the screen grid and control grid. This increase in spacing reduces the anode current that would otherwise iiow through the tube and correspondingly changes other characteristics of the tube, such as trans-conductance and screen grid current. The reduction in current flow is desirable, sincethe tubes, prior to aging, have widely diierent characteristics; but, by aging the tubes, the top level of anode current in all of them are reduced to a lower level, thereby reducing the spread above an arbitrarily designated lower level of current. Thus tubes with more uniform characteristics than prior to aging, are produced.
However, the prior art methods and machines lowered the current levels of all tubes alike, including those` wherein current levels were initially too low, thereby failing to obtain tubes with as good uniform characteristics as could be obtained by means of the present invention.
It is an object of this invention to provide a system whereby, while all tubes are subjected to treatment which may bring about a lowering of the current level in the tube, the treatment is varied as required for each tube to bring about a fairly uniform characteristic of current iloW through all of the tubes.
It is amore specific object of the invention to bring about an expansion of the screen grid of a tube, when required, tosuch a degree as to lower the cathode current to a predetermined value. l
VAnother object of the invention is to provide a system whereby although a group of tubes is'treatedi'for lower-v` ing the cathode current therein, the treatment of each tube Yis, individually controlled to bringabout a substantially.. equal cathode current in each of the tubes.
Other-objectspjof the invention will become apparent upon V.consideration of the followingspecication, when takenjn conjunction lwith the accompanying drawings inwhich: Y :.4 i.
, Fig... l Yis a diagrammatic vertical view of the aging rack Patented July 5, 1960 employed in the invention, with a conveyor about the rack.
Fig. 2 is a fragmental plan view of one of the bars used on the conveyor.
Fig. 3 is a fragmentary portion of the underface of the bar.
Fig. 4 is an end View of the bar.
Fig. 5 is a wiring diagram of the circuitry involved in the invention and Fig. 6 is a view of a type of tube which into the sockets on the bars.
Referring tothe drawings in greater detail, in Fig. l there is diagrammatically illustrated a conveyor frame 10, around whichtravels a conveyor 11 of two spaced parallel chains 1,2 (only one chain being shown) running in the direction of the arrow and havingV a vertical ascending side 13, an upper horizontal run V14, a -vertical descending side 16 and a lower horizontal run 18. 'Ihese chains are driven intermittently, for example one step every twenty five seconds, by a Geneva drive 20 whose drive shaft 22 may be variably driven, as through a Reeves transmission, not shown, to vary the timing of intermittent movement ofthe conveyor.V Spanning the chains are bars 24, each provided with a number of tube receiving sockets 26. To simplify the description, but not as limitative of the invention, specific numbers of parts and a specific type oftube will be referred to although it will be obvious that other vnumbers of parts and other types of tubes may be selected. For an example,l each bar, of which there may be one hundred and fourteen, is provided with nine sockets 26, each adapted forcee-ive a tube, as tube 28, eachV socket being provided with seven contacts 30 to correspond with the pins 32 on the tube. Each of the ascending and descending sides of the conveyor may accommodate nineteen of the bars and the lower and horizontal runs may each accommodate thirty eight bars. The sockets are loaded with tubes to be aged at the loading station at the right of Fig. 1 at about the third indexed position of the bar from the bottom run, and the tubes are removed at the unloading station on the descending run of the conveyor at about the third bar may be plugged above the bottom run. As a result, in this instance, the
contacts in a row as there are sockets on the bar multiplied by the number of contacts in each socket; since seven contacts have been selected for each of nine sockets,
there will be sixty three fixed contacts `in a row. The
socket contacts are brought to the lower faces of theLA bars 24 wherein printed circuitry 40, similar for each socket, leads the contacts to a row of shoes 42 mounted on the bar to correspond with the lateral spacing of the fixed spring contacts. The nine wires leading to corre,- sponding shoesV on each socket, as for example, the anode k connected shoes, are connected into a bundle 44, each bundle leading to the terminals of a polarized plug 46. 'Ihe plugs from one bar all lead to a plug-in panel 50.' Each panel has seven plug sockets 52 to respectively receive the pins lof the plugs. Each of the contacts of the plug-in sockets is fed with individually regulated current. at suitable voltages, so that each contact of the sockets on the bars can be fed with any desired voltage at any desired indexed position of the bars. This allows Vfor extreme exibility in aging of the tubes. In accordance with applicants invention, at one offth'e" indexed positions of the bars, for-example at the titty? sixth indexed position removed from the loading position," the wires from the spring contacts are differently bundled# .upon the current ow.viathe, screen:grid.andthe-poten- Herefthe seven wires originating Vfrom a Vsocket are made into a group, as group 58, and the nine groups of wires 58 from the nine sockets are fed to a relay box 60 Within which .are nineprelays 62, seeFig. 5, and associated equip Vment, as will be described. Each relay comprises. an: 5
electromagnetic coilz64; a pairg offfixedlback contacts .166, 68, a pair of lixed front contacts 7 0, 72, andantarmaturef; carryinga pair:of tied together movable; arms :76 and 78, the arm 76 alternatively contacting contacts 66 and .76; and the arm 78 alternatively, contacting contacts` 63 10 A wire 80 connects movable arm 76Lw-ith Ythe springcontact 381 leading to. they anodecf4 atube. A'4 wire- 82 ,connects movable arm 78 with-a spring contact 38fleading to the V#t l'iorf'co'ntrolgrid ofthe same tub'ei A wire 84 Y connects :ft2Y grid-lori?` screen spring` VContact Eliand re;
lay contact 66`A`wie 86 connects cathode Vspringl contact- 38` and relayA contact 72. The'heater'wires 87, 88 lead from springcontacts 3 8VV to a variablevtransformer 90 soI as to feed'any `desired-volt'age-to` the heater, and a suppressor grid springfcontact connectedv wire 92V leadsto one-side of a Vclosed switch 94 Whicli'switch is. connected atv its-,other side to the cathode lead 86. The contact 68V isegroundedwhile the contact 70 is open circuited; 25
VY The contact 66Y in addition to being connected to line 84.isvconnected via a load` lamp` 96 to asou1'ce'98l o-f`D;C. potential whichjmay be varied, at will. 'Ihel contactY 772isfconnect'edryia aleadrV 100 to the'movable arm101"of lafpotentiometer4102, grounded at oneend, 30
Aand connectedfat` its. other'uend to the cathode of" a self biased -grid'controlled gas iilled" tube 104, asfal type' 2D21, whose ,grid` is ground via a resistor 10.6. By
Y K' varying the positionV oflthe potentiometer`- arm 101, the' Y' voltage required 'to tireY theV tube 104 may bevaried at l35 will, Current tothe relay. coil. 64 is fed from a D C.
source,V cutV olf with each indexrmovement of the bars,.
' as byea'microswitch 107 opened `with every index of the Y bars, via a current limiting resistor l108 and the anodekof-the gas filled tube, when the tube isred. The state 40 of tube 104 may'V be indicated by a high resistance indi-` cating lampV as'a neon lamp 110 inrsh'unt with the-tubev l104'and its potentiometer-.102.. g
Each; of the nine tubes on Vthe bar atl thek titty-sixthV index" position registers With an ,individualY electrode 45 switchingcircuit, exactlynlike the one `described andil- Iustratedin Fig.` 5.V If Vcathodecurrent of a tube under testis; suticientlyV high,to maintainv over 2.0{-volt's.bias.
(in the casev oli the ZDZl type tube) over theYV lower part of potentiometer 1.02.,V the tuble 104 willfnot fre.50
Y andthe .circuit remainsas-show'n in the said igure. In.
this,` position, the, screen Vgrid Yoffthe tube .28'. under` test Y is"conductingvrcurrentwhile .the anode is not. Also the control grid.V is ,shortedY to` thecathode. current ow'th'rough the screen gridis high and the- 55 grid' lateralsY ofjthelscreen -grid become. suiciently. hot
Therefore, Y. the
tolexpandbeyondtheir elasticlimits. As the Vgridvvires expand, they move' farther from the controlrgrid,.wherer tiometer 102 diminishes. When-low enough, thefnegav60 tive -bias Yon, thegrid. oflthe-gas filled. tube decreases-V and thetubelires andA conducts untilthe. next index of f lefbar.V Piringgof' the.tube..10.4-fwill. causecurrent to ow .throughgthe relay Acoil 64. thereby throwing the?,
'movable arm` 76 and ..7 8 .against the back,xedcontacts566'165V and. 6.8 andthe` current ,iovvV throughthe tube yZllcisrdi-V-l rected viathega'node and. scrveen: grid-ntiedrtogethervas one unit. VAlso`t-he.controhgrid.ofv theatubeZt'iscon-1 nected. to, the ground,` imposing a. negativebias on0 the" `tentiometer 102, thereby limitingranodefcurrent through thee/tube.'4 This controll'edf and lowerivaluefcurrent is y' permanent deformation offthe grid twin" @eene-'75 Vvthe sockets, s aid relay mechanism comprisinga coi sponsive'to the magnitude of said current 'floweand'ropv `If a tube initially, with the circuitn theposiionshoyvll..
results desired. Also the current detecting means need 'Y not necessarily-be. af,-gas'.lledi tube sinceicontact making meters and other than gas filled; grid controlled tubes 5 can be used as Well, as triodes with' A.C. supply to the anode.
Nor need the detecting mechanism be confined to Ythecathode. circuit since it could be placedin any tube'circuitrwhere current flow varrieswith electrode deformation.. Y. l a What is'claimed as newfis: f
l. In a machine for aging electrontubesyhaving .a;g
,Y cathode, control. grid, screen grid; and anode, V.thefcom-Lrk -binatidn. comprising aconveyorV frame, ang indexiblel conveyorV on the frame, bars carriedrby'the conyeyor;^ andk tube socketsl for said tubes on each gbar, contacts on each bar. Wiredto individual contacts, in thetube:
sockets, contacts mounted on the'conveyorV frame, one;V .for each contactzon the bars at each ofv ajinultilgzlicity5.`
of positions .ofV the barsgsaid` frame mountedA contacts! Y Vbeing connectedindividually to individual sources; off-1 voltage, .thecontacts onthe frame. atone positionopi the bars, leading: to relay.v mechanism, switchingUllsarlsn formingyparti-of said mechanism; for normally; estabf lishing aicurrent'owfromescreen; grid to cathode;withinfY tubesV in the sockets, said relay'mechanism havingaafcirf cuit element throughwhich tubecurrentflows; and responsive tofthe magnitudezof'said current togswitchgthe'.TV
currentso,-thatiit..lows viathe anodeand screen grid 1 Vto thecathodefoftthentfube.r Y l 2. -In a machine for aging electron tubes having;` aff cathode, controlv grid, screen grid andV anode; theecomfA Y binationV comprising a Vconveyor frame, an .indexible- Y conveyor `on said frame, bars carriedybythe conveyori.
and tube socketsy -for said tujbeson eachY bar, contactso'n:l
each .barwired to individualcontacts in the: tube sockets` contacts-.mounted` on the conveyorframe, onefforfeaclifv contact on .the bars at each' of a'multiplicityr-of vpositions?.` Y Y'of-.the bars, said:Y frame mounted: contacts: b`eingf.c0uf.
nected individually to individual. sources of voltagefthe: contacts orrthetramef at` one positionfof the barsV lead ing.A to relayfcmechanism, switching Vmeans `forming-part Y of said.: mechanisme' for.; normally; establishingI a 1 current'- owfrom screen` gridto. cathode: WithinA tubes` ine-.thef sockets,v saidrelay :mechanism comprising a-:coil respon-z4 Y sive tothe magnitude ofi said: current zflow-fand operative upon-fan armature having'fcontacts, saidcontactsin onev position of thevarmature connecting? the; 'screenV gri'd to@ i an vidleY contact andl'in; anotherv positionnof theI karmatureconnectings thescreenjgridfto Vthe anode:
3. In a machine for aging-electron1 tubesj-havingfa. f cathode; control'grid, screen g'ridr andeanodefthe com` bination comprising a conveyorr frame; A,an \5ind'exib le confveyor oni said-1 framev `bars carried byfthectmveyer'j.-.and,`V tube sockets for said tubes on .each \barcontactsi.onw each 'bar-vr Wired to Yindividual .contacts in theftub sockets, contactsmountedon the` conveyor.frarne.one forfeachV contac t .on..the `'bars at ,eachV of. a-multiplicity voiigpo 'sitions-'of,thefbarsfsaid fr-ame;mounted-contacts--being connected L. individually ,to individual souresgo voltage?, Y bars". leading to.r relay. mechanism. switching. means; forming' part of. said mechanism vfor normals-establish'. rent ovv'r'fr'om screen grid'to' cathodej within' tubes rative upon an armature having two contacts, one of said contacts in a rst position of the armature connecting the screen grid to an idle contact and in a second position of the armature connecting the screen grid to the anode, the other of said contacts in said rst position connecting the control grid to the cathode and in said second position connecting the control Igrid to a negative voltage with respect to the cathode.
4. In a machine for aging electron tubes having a cathode, control grid, screen grid and anode, the combination comprising a conveyor lframe, an indexible conveyor on said frame, bars carried by the conveyor and tube sockets for said tubes on each bar, contacts on each -bar wired to individual contacts in thertube sockets, contacts mounted on the conveyor frame, one for each contact on the bars at each of a multiplicity of positions of the bars, said frame mounted contacts being connected individually to individual sources of voltage, the contacts on the frame at one position of the bars leading to relay mechanism, switching means forming part of said mechanism for normally establishing Va current flow from screen grid to cathode within tubes in the sockets, said relay mechanism comprising a coil in series with a self biasing grid controlled tube having a resistor in its grid circuit, an armature controlled by the coil, a contact movable with the armature in a first position to tie together the screen grid of the tube being aged and its associated anode and in a second position to disconnect the two, a second contact movable with the armature which in said rst position connects the control grid of the tube being aged directly with its associated cathode and in the second position interposes at least a portion of the resistor into the said direct connection.
5. In a machine for aging electron tubes having a cathode, control grid, screen grid and anode, the combination comprising a conveyor frame, an indexible conveyor on said frame, bars carried by the conveyor and tube sockets for said tubes on each bar, contacts on each bar wired to individual contacts in the tube sockets, contacts mounted on the conveyor frame, one for each contact on the bars at each of a multiplicity of positions of the bars, said frame mounted contacts being connected individually to individual sources of voltage, the contacts on the frame at one position of the bars leading to relay mechanism, a coil and switching means forming part of said relay mechanism for normally establishing a current ow from screen gridA to catho'de Within. tubes in the sockets, said relay mechanism including a'source of D.C. voltage, a relay having a rst, idle, front contact and a second front contact connected to the cathode of the tube, a third, back contact connected to the source o'f D.C. voltage and to the screen grid, a fourth, backcontact connected to ground and an armature having two poles a first one of which is movable between the first and third contacts and the second one of which is movable between the second and fourth contacts, said rst pole being connected to the anode and the second pole to the control grid, a grid controlled gas filled tube in series with the coil, means to break the current o'w through the gas filled tube, said gas lled tube having a resistance in series with the cathode and ground and biasedly connected at a non cathode connected portion of the resistance with its control grid, and a connection between the resistance intermediate of its length and the second front contact.
6. In a machine for aging electron t-ubes having a cathode, control grid, screen grid and anode, the combination comprising a conveyor frame, an index'ible conveyor on said frame, bars carried by the conveyor and tube sockets for said tubes on each bar, contacts on each bar wired to individual contacts in the tube sockets, contacts mounted on the conveyor frame, one for each contact on the bars at each of a multiplicity of positions of the bars, said frame mounted contacts being connected individually to individual sources of voltage, the contacts on the frame at one position of the bars leading to relay mechanism, switching means forming part of said'mechanism for normally establishing a current ow from screen grid to cathode within tubes in the sockets, said relay mechanism comprising a coil responsive to the magnitude of said current iow and operative upon an armature having contacts, said contacts in one position of the armature connecting the screen grid to an idle contact and in another position of tue armature connecting the screen grid to the ano'de, said screen grid, in both positions of the armature, being connected to a source of potential.v Y
7. A system for controllably agingelectron tubes having a cathode, a control grid, a screen grid and an anode,
said system including a source of D.C. voltage, a relay having a coil, a tirst, idle, front contact and a second, front contact connected to the cathode of the tube, a third, back contact connected to the source of D.C. voltage and to the vscreen grid, a fourth, back contact connected to ground and an armature having two poles a first one of which is movable between the first and third contacts and the second one of which is movable between the second and fourth contacts, said first pole being connected to the anode and the second pole to the control grid, a grid controlled gas lled tube in series with the coil, means to break the current ow through the gas lled tube, said gas filled tube having a resistance in series with the cathode and ground and biasedly connected at a non cathode connected portion'of the resistance with its control grid, and a' connection between the resistance intermediate of its length and the second, front contact.
Y References Cited in the iile of this patent UNITED STATES PATENTS Flowers Aug. 27, 1957
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US800734A US2943904A (en) | 1959-03-20 | 1959-03-20 | Current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US800734A US2943904A (en) | 1959-03-20 | 1959-03-20 | Current limiter |
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| US2943904A true US2943904A (en) | 1960-07-05 |
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| US800734A Expired - Lifetime US2943904A (en) | 1959-03-20 | 1959-03-20 | Current limiter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3210589A (en) * | 1960-04-28 | 1965-10-05 | Westinghouse Electric Corp | Electric incandescent lamp having filament of partially recrystallized fibrous structure |
| US3251640A (en) * | 1961-06-26 | 1966-05-17 | Sylvania Electric Prod | Process of aging tubes |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2435475A (en) * | 1942-04-14 | 1948-02-03 | Remco Electronic Inc | Ageing tubes having space charge grids |
| US2773731A (en) * | 1952-11-12 | 1956-12-11 | Columbia Broadcasting Syst Inc | Aging conveyor |
| US2804365A (en) * | 1954-05-28 | 1957-08-27 | Western Electric Co | System for automatically aging a magnetron and suppressing arcing thereof |
-
1959
- 1959-03-20 US US800734A patent/US2943904A/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2435475A (en) * | 1942-04-14 | 1948-02-03 | Remco Electronic Inc | Ageing tubes having space charge grids |
| US2773731A (en) * | 1952-11-12 | 1956-12-11 | Columbia Broadcasting Syst Inc | Aging conveyor |
| US2804365A (en) * | 1954-05-28 | 1957-08-27 | Western Electric Co | System for automatically aging a magnetron and suppressing arcing thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3210589A (en) * | 1960-04-28 | 1965-10-05 | Westinghouse Electric Corp | Electric incandescent lamp having filament of partially recrystallized fibrous structure |
| US3251640A (en) * | 1961-06-26 | 1966-05-17 | Sylvania Electric Prod | Process of aging tubes |
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