US1528763A - Switching device - Google Patents

Description

Margin 1o. 1925.

C. L, GOCDDRUM ET AL SWITGHING DEVICE Filed May 2, 1922 SheetS-Sheet l N March 1Q; 19125;. 1,528,763 C. L. GOODRUM ET Al...

I swITcHTNG DEVICEv Filed May 2, 1922 3 Sheets-Sheet 3 003g NN Q Q k Q; GX @Lav "feo' L A I o o o o Patented Mar. 10, 1925.

UNITED STATES PATENT OFFICE.

CHARLES I1. GOODRUM AND CHARLES J. HENDRICKSON, OF NEW YORK, N. Y., AS-

SIGNORS TO VESTERN ELECTRIC COMPANY, INCORPORATED, 0F NEW YORK, N, Y.,

A CORPORATION OF NEW YORK.

SWITCHING DEVICE.

Application led May 2,

To @ZZ whom t may concern:

Be it known that we, CHARLES L. GoonnUM and CHARLns J. HnNnnicKsoN, citizens ot the United States, residing at New York, in the county ot -New York, State of New York. have invented certain new and useful Improvements in Switching Devices, of which the following is a full, clear, concise, and exact description.

This invention relates to electrical switching devices and particularly to those employed in the establishment ot telephone connections.

ln certain types ot switching mechanisms the circuit making contacts, which serve to interconnect lines or other circuits, are arranged to undergo only a slight movement te engage their cooperating contacts. The acting contacts ot a given line may comprise bare wires, cooperating with the passive contacts ot all other lines or circuits with which connection is required. The contacts representing each line may be controlled by a mechanical switching` member, as for example, a rotatable bar. In order to select the bar representing the line, which is desired to be connected to some other line or circuit, it is proposed to provide sets ot operating members or bars. By the joint operation et an operating bar in each ot these sets the pioper switching` bar is selected and operated to prepare the line for connection. 1

Accordingly, the object of the present invention is an improved switching device ot the foregoing description, characterized by an economical disposition ot the constituent parts and also by simplicity in operation.

.tr feature ot the invention is the provision ot a switch having sets ot operating members, a plurality ot' which cooperate to select and actuate one of a plurality ot' switching members to connect a copresponding line to other lines, and in which the switching members are disposed in substantially the same plane as said operating members.

Another Yfeature relatesto the provision, in a switch having a line equipped with a pluralityY et' independently operable contacts and set ot circuit controlling contacts operable with each ot said lirst contacts, ot means tor va ying the time ot' operation oi 1922. Serial No. 557,845.

said controlling contacts relative to the time ot operation et said first contacts.

Such other and further features as are contemplated by the present invention will become more thoroughly understood from the following description and also from the appended claims.

ln the drawing, Fig. l illustrates, partially in schematic manner, a portion of the switching structure showing the relative disposition ot' the various elements.

Fig. 2 is an enlarged view illustrating more in detail the cooperation between the operating parts.

Fig. 3 is a detailed view illustrating a side elevation ot' the structure shown in Fig. 2.

Fig. Il is a perspective showing the dctails ot certain parts of the switch.

Fig. 5 is a detail showing a top view of one oi the operating members.

Fig. is a front view of a portion of the switch showing common means for operating circuit controlling contacts.

Fig. T is a side view oit' the structure seen in F ig. 6.

The switchingdevice embodying this invention, while applicable to various uses, is particularly suited tor establishing connections from a group oi subscribers lines to a group ot trunk circuits. Conversely, it is equally well adapted to the establishment ot connections from trunk circuits to subscribersi lines. For convenience in description, the switch is illustrated as having a capacity tor establishii'ig connections between any line in a group ot one hundred subscribers lines and any trunk in a group et ten trunks or, conversely, for establishing connections from any trunk in the group to any subscrlbers line. It will be obvious, however, that the switch may be yconstructed to accommodate groups of varying sizes without departing from the scope ot' the invention, and moreover, it may be employed as a connecting medium between two groups et' trunks or between groups ot circuits of any character.

As shown in the present embodiment, the connections between the diiilerent lines and the trunks are accomplished by means of circuit making contacts comprising plain bare wires, the movable wires being advanced Ainto engagement lpassive Wires Aby` operating members, Manifestly, other types of circuit'makingV contacts may be substituted if desirable.

A: detailed `description will now' beg'iv'en' of thef'con'struction' and methodof'opera'- tion of the switch. Referring to Fig. 1 the switching device is seen to comprise three sets of operating or switching membersV suitably journaled in the switch frameq'fnot shown), the cooperation of vwhich deter# mines the selection ofthe particularline to be'cn'nected 't0La"trunk. The/first' setcon-V sists of ten operating bars of lwhich three bars, 6, Tand' 8, areshwn, `The operating baropertains to ythe vrst group" or' ten subscribers lines, ithe operating bar 7 to 'the second group of 'ten lines, thefoperati'ng 'bar 8 to, the third group, and sopjon; y p s The second Set of operatingmeinbers consists of ten longitudinal'bars 1, s2,` 3, ,5, etc. These ,bars f are arranged' in substan-d tially thev same plaevwth-the Operating bars G, 7 8,' etc. ancl' fexteiid, throiigli'ou'tl the entirelength of the structure.A The operating bar `1 identiifiesthe firstline inl'eacli yoff the lten groups of lines. Similrly, tljre op- @rating bars' 2, 3', 4, 5, etc'. represent the' second, third, fourth, fth, etc. lines in 'each of the ten: groupsT of "subscriber`si' lines.V

The operating barv 6] connected to a series of ten rota- table rods 13, 14, 15 and which extend to points where they Icooperate, respectively, with the' ten'` operating bars 1, 2, 3, iena. 5,.,lAS1b'estseen in' Fig. 5, the rodll, for` instance,lis attachfedto the bar 6 through the mediumof the ,link 51, the link 51 being pivoted to thebar v6^ and rigidly ,secured to the r0d13'.v Each ,ofthe remaining rods is similarly attachedto the operating bari-6. Likewise',l the, operating har 7 isV connected to aseries of teny rota-table rodslS, 19, 20,721,122', etc., which are secured to the said bar 7 by similar links. The same is true withlrespect to the operating bar'Sendthe remaining bars in the set, not shown., i Y For m'partingmotion to the operating bar an electromagnet 23 isv provided, the armature 25 ofgwhich is adapted to engage the end of the bar 6,' The magnet 23 when energized attracts its armature and displaces Vthe bar 6 longitudinally; causing they ten rods .13, 14, V 15, l16, etc. to rotate through a slight angie for a4 purpose 4to be explained hereinaften Si-mil'arlyfthe oper.-

lating ,bar ,7l is provided with an electromagiiet 24 having an' armature 2G`for` die; placing sla-id b'ar in a longitudinal direction to cause the rotationof"the'lassociated rods.

Each of theten operatingba'rs 1, l3, 4, etc., inthe"secondset vis Iarranged for rotav tion through a slight angle in order yto' cooperate with the'l rotatable nods attached to each of the operating barsv f5, 7,' 8. The

rotation rof 4bars 1, 2, 3, 4, etc. is accomplished individual electroniagnets 9, 10, 11, 12,A each having armatures secured to the respective bars.

The tl'i'irdl set ,above mentioned, which will; be referred to hereinafter as switching bars, consistsfoflone'hundred bars 27, 2S, 29, 30, 31, 32, 33, 34, 35, 36, etc. arranged in groups of ten.- These one hundred switching bars are individual,respectively, to the one hundred'sub'scribers lines and are arranged in substantially the same plane with the other two sets of operating bars. By 'the novel mechanical varrangement employed in this switch, the several ioperatingand switching biis aresoy disposed' that the entire structure 'occupies 1a relatively small Yamount of space mAll elements are lcontained in substantially none plane, permitting easyl access tothe several' parts for adjustment and repair. o o

4Ehe ten ' switching bars 27, 28, 29, 30, 31-

which'pertainr to the rstg-roup often lines, enten'dfto points where they cooperate, respectively, with the corresponding'rods 13, 14, 15, 16,;17 and also with the operating bars 1. 2', 314. 5. Likewise, the ten'switchbars l32', 34,' 35, pertaining to the second group of ten li'nes, extend to pointsV u'fhere they, respectively, cooperate with the rotatable' rods 18, 19, 20, 21 and also with the operatingb'ars l1,22, 3, 4, 5. As will be brought out hereinafter tli'e switching bars are selected and ro'tate'dby the joint actuation'offan operating member in each ofthe two yfirst'n'ie-ntioned sets. For example, the operationof the member 6 in the first set prepares for selecting anyone of the ten switching bars 27, 28, 29, 80. Any one of thev operating bars 1, 2, 3,' 4 of the second setin conjunction withthe bar@ mechani cally selec-ts and rotates the corresponding One of ythe ten` switching bars.V Thus, by operating the bar '6 and anyone of the ten rotatable bars 1,2, 3, 4, 5, any onefof'r'the switching b'ar's 27, 28, 29, 30,1nay be selected androtated'. The rotation of a particular switohfi'ngbar determines 'the line to be conneoted'to one lof theten different trunks. or'tlie ten die'rent trunks Vto' which the linesv may `be connected there are provided ten trunkswitching bars 37, 38, 39, 40, 41, 83,184, etc. arranged in intersecting relation with `the one hundred switching bars previously mentioned and are alsodisposed in substantially the same plane. Each of the ten hars 37, 3S, 39 is individual to a trunk and'jis arranged 'for rotation by means of ythe respective Ymagnets 42, 43, 44. The

cooperation between the trunk vbars 37, 38, A

39,V and the switching bars 27, 28, 29, is such that `'whenever two of these bars are rotated' conjointly, the -Correspending subr .scribers' line is connected to the correspondmg triuik. The first trunk, shown in Figs.

` 1, 2, 3, 6 and 7 comprises thre'e bare wire tors.

conductors 68, 69 and 70 extending before all of the one hundred switching bars. The second trunk, comprising the three conductors 7l, 72 and 73, likewise extends before all switching bars and is individual to the trunk bar 38. The remaining trunks are similarly disposed.

The iirst subscribers line 98 in the iirst group oi' ten (F ig. 3) is served by the switching bar 27 and is provided with a set of movable or active contacts for each of the ten trunks. As is best seen in Figs. 2 and 3, the line 98 has a set of bare wire contacts 54, and 56 for cooperation with the trunk conductors 68, 69 and 7 O oi' the lirst trunk. These wire contacts are secured to an insulating block 74 attached to the switch :trame and extend through diagonal slots in an insulating card 52 to a point adjacent to the trunk conduc- The insulating card 52 is supported by springs and 61 in a position such that the movable contacts 54, 55 and 56 are normally out of engagement with the trunk conductors. The line 98 likewise is provided with a similar set of movable wire contacts 57, 58 and 59 which extend through diagonal slots in the card 53 to a point where they cooperate with the conductors 71, 72 and 73 of the second trunk. Similarly, the line 98 is equipped with movable contacts for all ren'iaining trunks and the same holds true with respect to the remaining lines.

The switch bar 27 individual to the first line 98 is provided with a series of lexible wires 62, 65, one for each of the insulating cards 52, 53. Normally these ilexible wires are out of contact with the insulating cards. vWhen, however, the bar 27 is rotated, these wires are carried into engagement with the notches provided on the lower ends of the cards 52, 53, respectively.

The trunk bar 37 has secured thereto a lever 66 arranged in alignment with the insulating card 52 and also a similar lever for each of the remaining cards pertaining to the trunk 68, 69, 70. Likewise, the trunk bar 38 individual to the trunk 71, 72, 73 has a lever 67 in alignment with the insulating card 53 and a corresponding level' for each of the remaining in'- sulating cards pertaining to this trunk. When one of the switching bars such as the bar 27 for example, is rotated, the ilexible wires 62, etc. are carried into engagement with the notches on the respective insulating cards 52, 53, etc. This position is illustrated in connection with the switching bar 28. If now the trunk bar 37 is rotated carrying its levers upwardly, the particular lever 66 engages the flexible wire 62 (see Fig. 3) and moves the insulating card 52 upwardly. The upward motion oi' the card 52 first carries the line contact wires 54, 55 and 56 into engagement with trunk wires 68, 69 and 70. The continued upward movement of the card causes the wires 54, 55 and 56, through the action of the diagonal slots in the card 52, to rub over the surface of the trunk wires, thus insuring a good contact. The same would be true it any of the other trunk bars were operated, namely the corresponding movable line wire contacts would be connected to the trunk to which the operated bar is individual.

A description will now be given ot the construction and operation of the operating and switching bars whereby the joint operation ot any two oit these bars mechanically selects and actuates the corresponding switching bars. The rod 13, as seen in F igs. 2, 3, 4 and 5, is provided at its lower end with a resilient projecting lever 47 the tip end or which is overturned to form a hook 50. The switching bar 27 pertaining to the rod 13 is provided at its upper end with a finger 49 which extends to a point where it is adapted to be engaged by the hook 5() when the lever 47 is bent downwardly. This arrangement 'is brought out most clearly in Fig. 3. The operating bar 1 pertaining to thc lirst switching bar in each group of ten bars has a lever 46 with a bevelled surface 48 adapted to be encountered by the lever 47 when the rod 13 is rotated, provided the rod 1 has previously been rotated.

Assume that it is desired to establish a connection between the iirst line 98 and one of the ten trunks and that the first trunk 68, 69, is idle. By any suitable circuit arrangement, such as shown in the application of C. J. Hendrickson, Serial No. 556,935, iiled April 27, 1922, the electroinagnet 9 may be energized. Magnet 9 attracts its armature and rotates the operating bar 1, tilting the lever 46 downwardly as seen in the upper portion of Fig. 3. Next, a circuit is established for the electromagnet 23. Magnet 23 attracts its armature displacing the bar 6 longitudinally, rotating each of the rods 13, 14, 15 etc. The rod 13 rotates the lever 47 to the right as seen in Fig. 4. Lever 47 immediately encounters the bevelled edge 48 of the lever 46 and is bent downwardly such that a continued movement causes the hook 50 to engage the linger 49 on the bar 27. Thereupon the switching bar 27 is rotated with the rod 13 and the flexible wires 62, 65, etc. are carried against their respective insulating cards, 52, 53, etc.

A circuit is then established for the magnet 42 and the trunk bar 37 is rotated, tilting the lever 66 upwardly. Lever 66 engages the wire 62, moving the card 52 upwardlyto ' carry the'wirelcontacts 54, 55

and 56 of the line 98 into engagementwithv the rWires 68,69, 70 or" the idle'trunli, thus Y establishing a connection. Although the re- 'maiiiino' rods 14 15 16. 17 etc. were rotated with the rod 13, none of them cause the rotation or' the respective switchingy The electromagnet 42, however, ismaintained energized `to retain the.. connection. ''Vhen the operating bars 1 and 6 restore, the switching bar 27 also returns to norii'ial. The restoration ot' bar *27, carries all or the remaining flexible Wires 6,5, etc.' back to their normal positions as shown in F ig. 2. The flexible Wire 62 however, is lield in by the notchedV surface oi ythe lever l66 against the lower edge ot the insiilating card When theconnecti'o'n is no' longer required the magnet 48 is deenergized, permitting the rodV 37 to restore. The'lex'ib'le Wire 62 now returns tto its normal positi'onaiid the iiisulating card 52 carries the. `contacts 54,

` and 56 out of ei'igagement with the trunk Wires.

As Washereinbetore discussed, a Vswitch of this vtype may bev usedy for `connecting lines to trunfksfor, conversely, for connect- 'i ing trunks tothe lines. In the lirst case itis the usualnpractice to operate. the. cut-ofi springsV which4 control the subscribers line relay after the .line has been extended through to an idle trunk. On the other hand, ifthe connection is one VWl'ri'ch is being extended from the trunkto fthe `subscribes Y line, itis desirable lto/,operate the subscribers cut-oil' springs slightly Vin advance of the time that the trunk is :connected to the line. This prior operation of the cut-ott springs prevents the accidental Venergization of the line relay and the false initiation ofv a call.

Referring-to Fig'.y6, it may be considered that the sivitch employed forfillustrating thisv invention serves in both of the above mentioned capacities. Assume, for example, that the subscribers line 98 is adapted for connection With a number of trunks for outgoiiigccalls and isalso adapted to be connected to byV a number of trunlisfforincoininfg calls. For example, the trunks 68, 69, and 100, 101, 102 are for handling calls originated onL the subscribes line 98. On the `other han'd, trunks 75,76, 77 and; 78, 79, are for routing incoming calls to the subscribers line 98. Therefore, Whenever the line 98 is connected to the trunk 68, 69, 70, it is neeessaiv that the subseribers cut-off 4springs should be operated 'subsequent to the connectionof the trunk to theline. lAlso when a connection is 'extended ft'i'on'i the trunk 75, 7 6, 77 to the lline 98, it isY desirable that the subseribei"s cuteotf springs should sets project to cooperate with the-respective Y trunks.

Considering Figs. 6 and 7, 4it'will` be noted that a given distance is provided between the.,-

spring 60 and the upper edge ottlievfindo-iv in the coniinon'operating nienibei87. The same is true with respect to the trunk 190,

`101, 192. llhenever the insulating card is vmovedV upwardly by -the ti'uifilrbar S7 to carry the contacts `54, 55 and v56V into engagement with the trunk conductors 68, 69, 770 to establisli'ia connection between the line 98 and the trunk, the spring 60 engages the upper edgeof theivindow'in thelmember `87 and moves this member upward bodily. The upward movement of the member v87 releases the `cut-off contacts to open the circuit of the lusual 4relay-(not shown).V The'idistance between tlie'strip 60 fand the upperedge `of the Window in the member 87 is so calculated that *theV member 87 is not moved to operate the springs 85 until slightly after the contacts 54, 55, 56 have engaged/the trunk conducto- rs 68, 69, 70. Hence, lthe cutoff springs 85 are not operated until after thefline is 'extended to the trunk.

Considering an incoming call over the trunk -7 5, 7 6,Y 77 to the line 98, it will now be explained how the cut-ott springs 85v are actuated-in advance'ot the connection. Observing the Windowy in the member 87 iertainingt-oftherinsulating card 89, it will be seen that the; distance between the spring V98 andthe upperedge of this Window is 'considerably less than the 'distance betvf'eeirtlie spring 60 and the edge oi' lthe correspondingA Window. This distancev is so taken that when the trunk bar 183 is operated to move thefii'isulating card 89 upwardly, thespring 93 engages the upper edge of the Window :in the member 87 in advance of the time` when 4the Wire contacts 90, 91, 92engage thetrunk' conductors 75, 76, 77.v Thus, the cut-oit springs 85 are actuated Vprior to the connec tien of the trunk to the line 98. Y

While the circuit controlling Vsprings 85r have been described in connection with the line relay operation, it will be understood that they may be used for controlling `any desired. circuit wherein similar requirements are found.

What is claimed is:

l. The combination in a switching device of a plurality of rotatable switching members arranged in a plane, operating members, certain of said operating n'ien'ibers being arranged in the same plane with said switching members, individual magnets Jfor said operating members for rotating a plurality thereof, said rotated operating members cooperating to select and rotate one of the switching members, lines, and means controlled by said switching members for interconnecting said lines.

2. The combination in a switching device of switching members arranged in a plane, a plurality of sets of operating members, certain of said sets of operating members being arranged in the same plane with said switching members, means for actuating operating members in different sets, said actuated members cooperating to select and actuate any one of said switching members, lines, and means controlled by said switching members for interconnecting said lines.

3. The combination in a switching device, of switching members arranged in a plane, a plurality of sets of operating members, certain of said sets of operating members being arranged in the same plane with said switching members, means for actuating any operating member in each of said sets, the actuated members in the different sets cooperating with each other to select and actuate one of said switching members, lines, and means controlled b y said switching members for interconnecting said lines.

4. The combination in a switching device of switching members, two sets of operating members, one of said sets of operating meinmers being arranged in the same plane with said switching members, magnets for actuating any operating member in one set and any operating member in the other set, said operating members coacting to select and actuate any one of said switching members. lines, and means controlled by said switching members for connecting one of said lines to another of said lines.

5. The combination in a switching device of a plurality of switching bars, operating bars, certain of said operating bars being arranged in the same plane with said switching bars, means for actuating a plurality of said operating bars, said actuated bars cooperating to select and actuate one of said switching bars, lines, and means controlled by said switching bars for interconnecting said lines.

' 6. The combination in a switching device of switching bars, a plurality of operating bars, certain of said operating bars being arranged in the same plane with said switching bars, means tor actuating an op erating bar in each set, said actuated bars cooperating to actuate any one of said switching bars, lines, and means controlled by said switching bars for interconnecting said lines.

T. The combination in a switching device of switching members, lines, one for each switching member, operating members, certain of said operating members being arranged in the same plane with said switching members, and means for actuating a plurality of said operating members, said actuated members cooperating to select and actuate one of said switching members for connecting the corresponding line with any of said other lines.

S. The combination in a switching device of switching bars, lines, one for each bar, operating bars, certain of said operating bars being arranged in the same plane with said switching bars, means for actuating a plurality of said operating bars, said actuated bars cooperating to select and operato one of said switching bars, other lines, and contacts controlled by a switching bar for connecting the corresponding line to said other lines.

9. The combination in a switching device of a first and a second set of operating members, a iirst and second set of switching members said first set of operating members being arranged in the same plane as said first set of switching members, lines, one for each switching member of said first set ot' switching members, other lines, one for each member of said second set of switching members, means for actuating a member in the irst set of operating members to cooperate with a member of the second set of operating members in the selection and actuation of a member of the first set of switching members, said latter member cooperating with any member of the second set ot switching members to connect the corresponding one of said first lines to any one of said other lines. l

10. The combination in a switching device of a plurality of switching members, a corresponding plurality of operating rods ar-A ranged in groups, a set of operating mem-V bers, one for each group of rods, a second set of operating members, means for actuating a plurality of said operating members, said actuated members cooperating to select and actuate one of said switching members, lines, and means controlled by said switching members for interconnecting said lines.

11. The combination in a switching device of a plurality of switching members, a cor responding plurality of operating rods arranged in groups, a set of operating members one :for each group of rods, a second set p f operating members common respec- `tivelyto the corresponding rods ot each ot' said groups ot rods, means for actuating said operating members whereby the actua.- tion ofanoperatmgmember in each set selects and Vactuates one of said switching members, lines, and means controlled byV said switching members for interconnecting said lines. V

12. y The combination in a switching` device ot a plurality otswitching members, a corresponding plurality ot' operating rodsarranged in groups, couplings between said members and saidrods, respectively, a set of operating' members one `foreach group of rods, a second set ot'. operating members commonr respectively to the corresponding rodsof each ofsaidgroups 'of rods, means for actuating said operating' members whereby. the actuation of; an operatin g member in each set couplesone ofsaid switching members to 4the'corresponding rod and actuates -said switchingmember, lines, and means controlled by said switching membersy Afor interconnecting said lines.

13. `The,combination cfa line, a plurality of yother lines, lcircuit contact sets for said Vfirst, line, one for connecting vthe same Vto each of said otherllines, operating' means for actuating any set of contacts, a set or" controlling contacts, and means operable upon the'actuation of any .set of said circuit con-. tacts foractuating said. controlling contacts at different times relative to the time of actuation ,of said circuit contacts.

14. The ,combination ota-line, a plurality of other lines, circuit contact sets for said lirst line, ,one for connecting` the same to each of saidnther lines, operating means for actuating any -set of contacts, a set of con-y trolling contacts, means operable upon the actuation of any setot said circuit contacts for opeaa'ting said controlling contacts, and means fortiming .the actuation ot said controlling ,contacts With respect vto theV time offactuation, of said circuity contacts.

l5. The comb-ination of` a line, a plurality of other lines, circuit contact sets for said lirst line, one for connecting the samer to each of saidotherlines, ,operating` means for actuatingany. .setpf contacts, a Vset ofcoutrollingontacts,,means operable upon the actuationof any set of said circuit contacts for operating .said controlling contacts, and meansfor'timing the. actuationof said controllingcontactsdepending on Which-set ot'v circuitconta'cts is actuated.

Vltflllie combina-tion' ot aline, a plurality of other lines, circuit contactk sets for said first line, one 'for connecting' the same to each of said other lines,operating means for actuating any' set of contacts, a set of con trolling contacts, andmeans operable upon the actuation of any Set of said circuit contacts for operating vsaid controlling contacts in advance of the actuation ot certain circuit contacts andV subsequent to the actuation of other of said circuit contacts.

17. The combination of a line, a plurality ot other lines,-circuit contact -sets for said lirst line, one for connecting the same( to each of said other lines, operating means `for actuating any setot contacts, a set ot controllinglcontacts, and means oierable-upou the actuation of any set ofsaid circuit conn tacts` for operating said controlling contacts, said last mentioned means fbe'ing a member common to all circuit contact sets for timing the actuation-otv said controlling contacts relative to the time of actuationot the circuit contacts. i

'18. The combination ot aline,l a `plurality otl trunks, circuit contact sets for said line, one for connecting the same to each of said trunks, operating bars for actuating any set ot said contacts, a 'set of controlling con tacts, and-'means operable upon each operation of said bars for operating said controlling contacts at different 'times `relative to the time of .actuation of said circuit? contacts. V

19.- The combination cfa line, a plurality of'other lines, circuit contact sets for said irst line, one for connecting the same to each of said Vother lines, a plurality of loperatingmeans, eachfindivid'ual to a contact set, a member common 'to said operating means and actuated-thereby each time a set of contacts is operated7 and a device controlled by said common member,

20. The combinationy of a line, a plurality of other lines, circuit contact set-s for said firstV line, one vfor connectingA the same to. each ,ot said other lines, a plurality-ot' op-A e1ating'-means, each individual to a contact set, a Ymember common tov said operating means and actuated thereby each timea set offsaid contacts is operatechand controlling contacts operatedb)7 said commonmember.

In Witness Whereofve hereunto subscribe our names fthis 426th day ot April, A. D. 1922.V w i CHARLES L.l GUODRUM. CHARLES HENDRICKSON.

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