Dec. 10, 1946. _ c. GILLINGS ET AL ‘2,412,257 CROSSBAR‘ SWITCH MECHANISM Filed DeC. 4, 1943 _ , GHARL LAWRENCE BY ,J. INVENTORS GILLINGS HN MURRAY / ATTORBEY Patented Dec. 10, 1946 ‘2,412,257 UNITED STATES PATENT OFFICE 2,412,257 CROSSBAR SWITCH MECHANISM Charles Gillings and Lawrence John Murray, Liverpool, England, assignors to Automatic Electric Laboratories, Inc., Chicago, 111., a cor poration of Delaware Application December 4, 1943, Serial No. 512,889. In Great Britain January 21, 1943 3 Claims. (0]. 179_27.54) 2 1 The present invention concerns crossbar switches of the type in which in order to effect the selection of a desired contact set, a preparatory operation is effected for the row of contact sets in which the desired contact set is located and an in horizontal magnet) as well as means for deter ?exibly mounted selecting ?ngers corresponding located respectively and the subsequent operat ing and holding operations corresponding to the mining the desired operating or holding oper ation (e. g. the desired vertical magnet). It has been proposed to employ a uniselector switch separate and distinct from the crossbar mecha operating and hold operation is subsequently ef nism to select the desired horizontal magnet in fected for the column in which the desired con response to received impulses and the object of tact set is located to effect the operation of the present invention is primarily to avoid the the desired ‘contact set while permitting the necessity of providing a plurality of horizontal preparatory operation to be repeated if required 10 magnets 01' their equivalent and in addition the for the operation of *other contact sets in the invention provides means whereby a crossbar same row. switch mechanism can be operated directly by In one form of such switch there is provided impulses. ' for each of the columns a holding bar member According to one feature of the invention a operable under control of an electromagnet, while _ crossbar switch is provided in which desired sets for each pair of adjacent rows of contact sets of contacts are operated due to initial prepara there is provided a selecting or preparing bar tory operations corresponding to the rows of con member which carries a number of ?exible or tact‘sets in which the desired contact sets are to the number of vertical columns, and which is operable under control of a pair of electromag nets to move the selecting ?ngers into position adjacent the contact sets of either of the pair columns of contact sets in which the desired con— tact sets are located respectively characterised by the provision of a single step-by-step elec tromagnetically operated mechanism arranged to A IOU-point switch of this kind is provided with e?ect by mechanical linkage initial preparatory . ten rows and ten columns of contact sets and operations for a plurality of operating and hold with ?ve two-way horizontal selecting bars each ing operations. of which will carry ten selecting ?ngers corre According to another feature of the invention sponding to the ten vertical holding bars which a crossbar switch is provided having parallel bars will be required and at each of the ?fty inter 30 for effecting initial preparatory operations and section points two sets of contacts will be pro having other parallel bars for effecting operating vided. In order to select a given set of con and holding operations crossing said ?rst bars of rows involved. \ tacts the associated horizontal bar will be twisted in a direction to bring its selecting ?ngers oppo site the contact sets of the particular row of ten in which the required contact set is located and the subsequent operation of the vertical bar com mon to all the sets of contacts in the same column as that in which the required contact set is located will operate this contact set due to the fact that this will be the only one in the column having a selecting ?nger interposed between it self and the vertical bar. .When this contact set has been operated the horizontal bar may be released, but the contact set operated will remain held from the verti cal holding bar. Subsequently a second or fur ther set of contacts can be operated in similar manner provided it is in a different column to the one already operated, but it may be located on the same row. With switches of the type referred to, in order to select the desired contact set it is necessary in which a shaft extending parallel to said other bars is arranged in each of a number of differ ent angular positions to select one of said ?rst bars to effect an initial preparatory operation so that when one of said other bars is operated after one of said ?rst bars a contact set asso ciated with the intersection of said bars is oper ated and the shaft is free to be reset for the selection of another contact set. One example of the invention is illustrated in the accompanying drawing comprising Figs. 1-4, of which Fig. 1 shows a partial front elevation of '9 a 100-point crossbar switch of the type described with an impulse responding uniselector mechani cally coupled thereto. Fig. 2 shows a view through the line AA (Fig. 1), while Fig. 3 shows a view through the line BB (Fig. 1). Fig. 4 shows a perspective view of part of the mechanism of a typical crossbar switch, further information about which can be obtained from our application Serial No. 476,898, ?led February 24, 1943, now Patent No. 2,364,706, dated Dec. 12, 1944. paratory operation to be effected (e. g. the desired 55 Referring now to Fig. 1, the crossbar switch is to provide means to determine the desired pre 2,412,257 la, It will be understood that the invention is not provided with ?ve horizontal bars such as H, 2| and 23, and ten vertical bars such as l2, the latter being operated by the vertical bar mag to an impulse responding switch. For instance net armature Id. The contact sets are indicated where the prepare operation is effective as a re restricted to application to a group selector or generally by the rectangles such as [3. The pair 5 sult of hunting for an idle or marked line, a wiper of contact springs at the intersection of the of the uniselector mechanism controlling the horizontal bar II and vertical bar l2 are shown in Fig. 4 where the contact spring sets are desig prepare bars can be arranged to test the condi tion of contacts marked by the lines being tested While the magnet of the uniselector steps auto on the horizontal bar being designated 26. 10 matically to advance the wipers. The arrest of As regards the operation of the horizontal bars, the wiper on the line selected corresponds of the shaft it of the uniselector I5 is rotated in course to the deflection of the horizontal bar and response to a train of received impulses and there of the prepare operation appropriate to the con upon drives shaft l1 through suitable gearing IS necting up of said line. in such manner that for eleven steps of the uni 15 What we claim as new and desire to secure by selector the shaft I6 makes a complete revolution. Letters Patent is: It will be seen from Fig. 1 and Fig. 2 that there 1. In a crossbar switch, lateral bars and longi are ten pins l-ll arranged in a spiral on the shaft tudinal bars so arranged that each lateral bar l1 and the arrangements are such that in response intersects all of the longitudinal bars, two sets of to a single step of the uniselector the shaft (6 20 electrical contacts for each such intersection, each rotates su?iciently to move the pin l into a posi of said bars having a normal position, means tion where it will rock the arm 19 ai?xed to the mechanically linked with allof said lateral bars end of the horizontal bar II thus causing the and selectively operated to move any desired one latter to rotate through a given angle and to bring of the lateral bars in either of two directions all the operating ?ngers associated with it into 25 away from its normal position, means for moving‘ their respective engagements. any one of the longitudinal bars away from its‘ At the second’ impulse, shaft H makes a further normal position, and means whereby the move step and moves pin I out of engagement with ment of any one of said lateral bars and any one arm I9 thus restoring horizontal bar ! I to normal of said longitudinalbars away from their 'respe’ce under pressure of a conveniently mounted return 30 tive normal positions is effective to operate the spring 21. At the same time pin 2 moves into two contact sets for the intersection of those bars engagement with arm 20 a?ixed to the second selectively in accordance with the direction that horizontal bar 2| thus operating this bar in simi said one lateral bar is moved away from normal. lar manner as for bar II. At the next impulse, 2. In a crossbar switch, a plurality of parallel bar 2| is restored and bar 23 is operated by pin bars each having a normal position, mechanism 3. and arm 22 and so on. On the sixth impulse common to said bars operated to engage and move arm I9 is again rocked, but this time by pin 6 any desired one of said bars to either one of two in the opposite direction to its operation by pin I. oif-norm'al positions, a plurality of parallel bars This rotates arm I! in the opposite direction to arranged in a direction transverse to said ?rst put the operating ?ngers into engagement with bars, each of said last bars having a normal posi the other set of springs associated with arm II. tion, means for moving any desired one of said Similarly the seventh, eighth impulse and so on last bars to an off-normal position, a plurality respectively cause pins 1, B and so on to operate of contacts sets, and means whereby one of said bars 2|, 23, etc. sets is operated by the movement of one of said At the end of the digit dialled the appropriate 45 bars to an off-normal position whenever such pin on shaft I1 is in engagement with its appro movement occurs at a time when any non priate arm and the appropriate horizontal bar is parallel one of said bars already occupies an nated 24 and 25, the corresponding spring ?nger off-normal position. therefore operated in the correct direction so as to prepare all circuits in the level required for 3. In a crossbar switch, lateral bars and longi the selection of an outlet. When this is chosen 50 tudinal bars so arranged that each lateral bar the‘ associated vertical magnet operates and operates the correct spring set. The uniselector thereupon homes and the shaft I‘! thereupon restores to its normal condition for another call. jections for each lateral bar, means for rotating . It will be understood that the wipers and banks said select rod to cause one or the other of any intersects all of said longitudinal bars, each of said bars having a normal position, electrical con tacts at each intersection of said bars, a select rod having helically arranged projections, two pro of the uniselector may still be used for other functions as required. pair of projections to act on a corresponding lateral bar, thereby to displace said bar in one The invention may be applied for instance to direction or the other from its normal position, the group selector described in our application 60 means for displacing any one of the longitudinal Serial No. 512,888, ?led Dec. 4, 1943. It would bars from its normal position, and means respon necessitate the control equipment being individual sive to the displacement of said lateral bar fol to the group selector which is usually the case lowed by the displacement of said longitudinal and would in the case of the crossbar switch bar for operating a corresponding set of contacts whose preparatory operation is‘ determined by the received impulses eliminate the wiper which se lects the prepare magnet for such switch as well of course as the prepare magnets themselves. at the intersection of said bars. ‘ CHARLES GILLINGS. LAWRENCE JOHN MURRAY.