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Publication numberUS1462047 A
Publication typeGrant
Publication dateJul 17, 1923
Filing dateOct 14, 1920
Priority dateOct 14, 1920
Publication numberUS 1462047 A, US 1462047A, US-A-1462047, US1462047 A, US1462047A
InventorsNewberry Reynolds John
Original AssigneeWestern Electric Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Crossbar line switch
US 1462047 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

July 17, 1923.

J. N. REYNOLDS CROSSBAR LINE SWITCH Filed Oct. 14 1920 5 Sheets-Sheet 1 L/0/7/7 A/PeJ//nO/d,


July 17, 1923.

J. N. REYNOLDS CROSSBAR LINE SWITCH Filed Oct, 14 1920 5 Sheets-Sheet 2 July 17, 1923. Y 1,462,047

J. N. REYNOLDS CROSSBAR LINE SWITCH Filed oct. 14 1920 s sheets-sheet s July 17, 1923. 1,462,047

J. N. REYNOLDS CROSSBAR LINE SWITCH Filed Oct. 14 1920 5 Sheets-Sheet 4 *July l 7, 1923. 1-f462,047

J. N. REYNOLDS CROSSBAR LINE SWITCH Filed oct. 14 1920l 5 sheets-sheet 5 i y JO/7/7/V 9627/70/06 scribers lines.

Patented July 17, 1923.





Application filed October 14, 1920.

To all whom t may cof/cern Be it lrnown that 'i'. Jorrit Narrateur ldicrixoLos., citizen el? the United States. residing at Greenwich. in the county ci Fairfield, State ot Connecticut, have invented certain new and usei'ul .improvements in Crossbar Line Switches, of which the following is a full. clear, concise, and exact de scription. I

This invention relates to electric switches of the type used in automatic telephone eX- changes tor effecting connections between calling subscribers lines and trunk lines to first selectors or other switching apparatus whereby calls are extended to other sul i Switches of the class including this invention are known as line switches. More particularly this invention relates to that class of line switches designated as the cross bar type.

The object oi this invention is the prevision ot a commercially practicable cross bar line switch, that is one which is economical to manufacture, which will, give continuous and satisfactory service and which is easily accessible for adjustments. repairs7 and replacements of parts when the latter become worn.

All cross bar switches, as the name implies are characterized, in contradistinction to other types of line switches, by c0ordi nately arranged conducting bars; those bars extending in one direction being associated with subscribers lines and those extending in the other direction with trunk lines. The subscribers line bars, or briefly line bars each being arranged in co-ordinate relation to all the trunlr bars are adapted to establish electrical connections with all the trunk bars individually. In other words. any subscribers line associated with the switch may be connected with any trunk line associated therewith.

In ordinary practice, a cross bar line switch is provided with ten or twelve trunk bars, each of which is associated with a separate trunk circuit, and one hundred line bars, each of which is associated with a sub-- scribers line.

This invention does not differ functionally from the cross har line switches which have Serial No. 418,835.

heretofore been developed7 but it does differ therefrom in certain improvements which contribute materially to operating eilic'iency and economy.

One of the improved features of this invention is the provision o'lf means whereby the line bars can be readily moved out of operable relation to the trunk bars so that the latter are made accessible for adjustments. repairs and replacements. This ad vantage is accomplished by mounting the line bars in `groups on hinged members which are easily swung into or out of their normal positions.

Another .feature resides in the improved design of the trunk bars, which while providing a structure which is extremely economical to manufacture has an added advantage oif no small importance, in that its contact springs are particularly easy to ad- `tust.

Still another feature is the arrangement ot the line bars so that they move in a horizontal plane instead of a vertical plane to establish connections with the trunk bars. This `feature is ot' advantage because it permits mounting the line bar operating magnets more conveniently in the space available and permits the use of larger magnets than would otherwise be possible, unless the line bars werel spaced farther apart, which would of course result in a larger switch.

The switch to be described hereinafter as representative of this invention comprises twelve vertical trunk bars and one hundred horizontal line bars. Each trunk bar is divided into two like parts, but the two parts operate simultaneously and are connected together electrically. They are in eil'ect one trunk bar and are so considered in the detailed description hereinafter. The;T are arranged in two groups, one above 'the other, one haiil of each trunk bar being in the upper group and the other half in the lower group.

An operating mechanism for the trunk bars is situated midway between the two groups. The function of this operating mechanism is to select idle trunk hars and move them into position so that they can be engaged by the line hars, and further to release the trunk bars after they have been so engaged. When a trunk bar has been moved into position where it can be engaged by a line bar it is said to be pre-selected or to have been moved into its pre-selected position. The method of pre-selecting the trunk bars in the present instance consists in rotating them through a small angle from their normal positions. Qnly onel trunk bar at a time can be in a pre-selected position. As soon as trunlr bar is engaged by a line bar it must be returned to its normal position, and a succeeding idle trunk bar must be immediately pre-selected.

The trunk bar operating mechanism described hereinafter is that which is described and claimed in the co-pending application of Arthur C. Magrath, Serial. Number 417,068, inea October i5, 192e.

The line bars are arranged in tour of twenty-tive each, there being` two groups of line bars on each side of the switch. The line bars described hereinafter are those which are described and claimed in the copending application of Arthur C. lllagrath, Serial Number 417,428, tiled ctober i6, 1920.

Referring to the drawings herewith: Fig. l is a perspective view showing the assembled switch. This view particularly illustrates the hinged mountings for the line bars. The lower group ot trunk bars is shown in this' view, the upper group being concealed by the line bars. The trunk bar operating mechanism is shown in a general way situated between the two grouns of trunk bars. The electro-magnets iter operating the line bars are shown situated in a vertical row on the right hand side ot the switch. Fig. 2 is a fragmentary cross-sectional view showing four trunk bars; one line bar with the hinged member on which it is mounted (the hinged portion being broken away), and two electro-magnets tor operating line bars. Fig. 8 is a cross sectional view along the line 3-3 of F ig. 5, illustrating particularly the trunk bar operating mechanism. F ig. 4f is an elevational view taken at the left hand end ot' Fig. 3, showing the trunk selecting commutator and the motor magnet Yfor rotating the trunk bar operating mechanism. 5 is a sectional view along the line 5-5 ot' Fig. 9, illustrating the trunk bar operating' mechanism, Fig. 6 is an elevation ot the groups middle portion of the switch on the side thereof opposite the trunk bar operating mechanism as indicated by the line 6 6 of Fig. 5. Fig. 7 is a perspective view ot a portion of a line bar.

Each trunk bar, as previously stated comprises two like sections, one ot' which is situated in the upper group and the other in the lower group. This is illustrated in Fig. 5, which shows the lower end et an upper strip, etc. The strips are superposed and vii'isulated troni each other and are att-ached to the supper-til member ot the trunk bar bj.' means oi'l bolts l2". The spring-arms are arranged in groups shown in lig. 5, cach group being associated with a line har.

il. strip ot insulating material .ll having a. tlat edge a ainst which the spri g-arins normally bear, is situated near the ends oit the spriiur-arms. This strip holds the springirms i a common plane. i

lilith the arrangement described wherein the spring-arms are situated side by side instead ot being superiiiosed one upon the other as has heretofore been customary, adjustment of the individual spring-arms is facilitated in that the adjusting of each springarm is entirely independent ot and docs not inici-'tere with the adjustment et the others.

The line bars. each comprise 'four strips ot metal. 6. 3 and Sl, each or which is provided with thirteen contact V`icinbers l0. Twelve of' these contact members' are each associated with a. spring-arm of :i trunk har and the other contact member is l.zociatcrl with a coi'it-act spring ll. ildlhen a. line bar is in normal position :is shown in Fig. i2, none of its contact members 'ill are eng tied.

The line bers1 are cach pivotally nounted on linlrs le; which in turn are pivotally mounted on. brackets l5, which are attached to the hinged members di). Springs i6 hold the line bars in their normal positions when they are not otherwise displaced.

dissociated with each lne bar is an electro-magnet 19 which has an armature 19 to which is attached an arm 1T. The latter gages the line har and Iupon cnel` 'tation ol electro-magnet 1li? moxcf the line oar out of its normal position through an arcuate path indicated by the arrow in Q. It will bc seen that the ends ot the springet' the second tzunl lar i'roii-, the right in Fig. 91 interceiit the paths oii tlese associated contact members l0. This trunk bar is in its pre-selected. position.. having been rotated. from its normal position parallel to the other trunl; bars shown. The ends of the spring-arms oil: the other trunk bars in Fig. E2, it will be seen do not intercept the oi their associated contact members (lontact springs li are not rotatable-- they maire contact with their associated contact members l0 each time the line bri is l r operated., regardless oft which trunk bar is engaged.

Ln individual subscribers line beingconnected with each oli contaci. sprint/s ll., it the follows that, through the medium oY associated line bars, each subscriberis irai' be connected with au): liunl terminaitin the switch. The lower end of each per trunk bar section and the upper end o.. each lower txiinl; section is provided with a laterally extending erin 2l which coope with trunk bar operating; mechanism to rothe trunk hals into their Vcre-selected isa Si spring' 22 bears aglinst arm l i retains inc trunk bar its norma `ion When it is not otlreiWii-sey displaced bar operating mechanism conit journaled in hearings 3'? and 38. i. 1e sh 'ft is rotatable and moveable loirigitidinalli.,` in the bearings. il. ine; 39 is orovided i r liaiding;` the sh "t i on as shoe/n thi.. posiV4 ,l ratchet prises a 1 i -11 l .in nig. o an( tion alter it h 7 mounted s o ed by armature 33"?. which operates to rota lfi'lounted lon shaft 253 equal intervals are twelve discs 2l, one for each trunl; bar.

These discs both rotatable :im movable loi itudiualli/v with the s1 att. Each disc is provided with tn'o li f/o itualeo -iieano tvo slots w .i .i L e ano. at nene ineetiieallg7 opposite each oth- 26 also diametricallj/ opposf. angles to the lugs.

The lues 253 ol; the several d oted in different angular the shalt as short7 Vi.

rEhe lugs eel1 n longitudinal oi si iai@ to enH the ernis 2l Wits which they are associated and thereby to rotate the trunkbar into its pre-selected position. lt only when the lugs are in juxtaposition to their associated ernis 2l, however, that they can engage them and since only one 1gair o'f lugs is so situated at anziT one thne7 it is `obifious that onlyv one trunk bar can be preselected at a time.

` latch member 353 clear 5 is provided for each ,4 is pivotally mounted on pin and ividecl with a il which tends `it in its normal position.

llllhen the trunk loar is pre-seleetedj latch engages the lug on the arm holds the bar in its AV,re-selected posi.

t is released as will be explained. .er linger 36 attached to or Wit each latclA member p o ts into the oa or s When the lu in position to engage gee iflle trunk. 'flic tion: ry until, in response to the next suhscrihers call, the preselected trunk har is encased by a line bar. This is immedia'ely i by energization et electroanagnet S32-l. which draws up its armature 34; therebi7 imcartineA a longitudinal movement to shalt Q9. IThis longitudinal movement ol' the :shalt @heels the release ot the pre-seiccten trunl :1r and simultaneously mores i* next idle trunk bar into its preselected ion.

he eoniinutator shown in Fig. conia pluralitli of stationaryv tern'iinals ieach associated with a trunk. Brush 3l mounted on shaft 23 and rotatable therewith ad ice-il to make successive Contact with terminals @2. Brush 3l is inclndeigl in the circuit @if electro-magnet 30. YWhenever brush i'l n'ialies contact With a` terminal 132 `which is associatei'l with a busy trunk, there is :i circuit estaliished through electro-magnet l0 which causes it to operate its ture therebj,v rotating shalt Shaft Q3 is thus rotated until a terminal associated zritl.. an idle trunk is located by brush 8l, at which ti7 pair oi lugs associated 'trunk are also in operable i associated arms shown in Fig. (i are .o movements of the inasmuch as .i'e are not rl with the circuits, but cull;1 i, the mechaniczl structure no description of ooeetion of these contact springs be l(given.

.flint is claimed is:

l. ln a line switch, a plurali@T oli vertical each trunk bar comprising a pluts oil Contact spring arms all of sp arms normally situated 1 a pluralilj,7 line bars, compl ising a plurilityv of sets g contact members one trunl; b r, means for (l olacing g il bars individually to position said Vorine arns thereon in oper: ble re bu L.

said line bar, means lor mom ig arktehhsh connections between placed trunk bars.

switch coinprising a pluralitgT trunk hars, a pluralityv ol horiiridnall operable line bars coand a hinged member on which said line bars are mounted.

A line switch comprising a plurality oit vertical trunk bars, a plurality of horizontal individually operable line bars cooperativebr associated with said trunk bars and a hinged member, on which said line bars are mounted, arranged to swing;Y hori- :iontellT7 away Yfrom said trunk bars.

4. A ,line switch comp`.ing a. plurality o1" Vertical Iunir bars, a plurality of'groups or line bars cooperatively associated witl said trunk bars, a hinged member for one or said groups or line bars arranged to move sait. Group out of operable relation to its associated trunk bars, and n'ieans individual to each line bar oit said group lfor moving it into operable relation to its associated trunk In a switching mechanism, supporting frame, lield oil" Contact sets comprising two groups of contacts coopera ly associated, the contacts of one or said groups being divided into sections, means for removably mounting' said sections olE conncl's on said frame, and means comprising coordinate bars operating Conjointly ilior ope ating said Contact sets.

6. In a matching mechanism. :i supportingw frame, Contact se s comprising; two groups of contacts cooperatively ssd ciated, the contacts or one o. said groups beimgr divided into sections, a ttor supporting each oill said sections oi: contacts. means for removably attachu said nieinbers 'to said and means( comprising oordinate bars operati. eonjointly Vlor operating); said, contact sets.

7. ln a switching' mechanism. a support-- ing frame. a field ol: contact sets comprising a plurality oi contacts arranged in hori- Yontai rows and a plurality of contacts arranged in Vertical rows,- said horizontal rows el contacts beingjT divided into sections separately supported upon said trame, and i sans comprising coordinate bars operating; Conjointly for operating said contact sets.

8. ln a switching mechanism, a supportinfr frame, a field of contact setscomprising tno groups of contacts cooperatively associated, the contacts ofi said groups being divided into sections, means 1for removably moulding' certain olf said sections o: contacts on said frame, and means comprising' coordinare bars operatingconjointly for operat- .ingr said contact sets.

A trunk bar comprising a plurality of' conductor strips superposed and insulated one ,from the other, plurality of contacting mbers extending laterally from each of said conductor strips and integral therewith, and a member having` a straight portion aoa t which said Contactingmembers bear, the Ytree ends oi said contacting members bethereby normally held in a common plane.

l0.' A trunk bar comprisingl a plurality of conductor strips superposed and insulated one troni thev other, two groups olE contact members each extending laterally in opposite directions from each o? said conductor strips, and an aligning member for each group against which the Contact members bear, the free ends of the contact members o. each group being thereby normally held a common plane. ln Witness whereoit I hereunto subscribe my name this 9th day of October, A. D., lQQO.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5737861 *Apr 23, 1996Apr 14, 1998Tri Motion Design, Inc.Intermittent motion gear box
U.S. Classification200/175, 123/41.21, 335/134
International ClassificationH01H67/26, H01H67/00
Cooperative ClassificationH01H67/26
European ClassificationH01H67/26