US1484771A

US1484771A - Telephone system

Info

Publication number: US1484771A
Application number: US519857A
Authority: US
Inventors: Charles L Goodrum
Original assignee: Western Electric Co Inc
Current assignee: AT&T Corp
Priority date: 1921-12-05
Filing date: 1921-12-05
Publication date: 1924-02-26
Anticipated expiration: 1941-02-26

Description

Feb. 26, 1924.

c. L. GOODRUM TELEPHONE SYSTEM Original Filed Nov. 25 1919 2 Sheets-Sheet l mu /flan 074/765 L600drum Feb. 26 1924.

C. L. GOODRUM TELEPHONE SYSTEM Original Filed Nov. 25.

1919 2 Sheets-Sheet 2 hue/77hr. (/mr/cs 1 6004mm.

COMPANY, INCORPORATED, F

"LE L GOODBUM, OF NEW YORK, N. Y., ASSIGNOR 'I'O WESTERN ELECTRIC NEW YORK, N. Y., A CORPOTION OF NEW YORK.

TELEPHONE SYSTEM.

Continuation oi application Serial No.

To all whom it may concern:

Be it known that 1, CHARLES L. Gooonom, a citizen of the United States, residing t New York, in the county of New York,

State of New York, have invented certain new and useful Improvements in Telephone Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telephone systems and more particularly to automatic systems of the type popularly known as full relay systems By means of novel circuit arrangements, 1 have produced a full relay system which is eflicient, simple of operation, rugged and of low first cost.

The invention relates to a system of the general type disclosed in Patent No. 1,107

152 issued to E. E. Clement, August 11,

1914, and this application is to be considered as a'continuation of my copending application, Serial No. 340,566, filed November 25, 1919.

The present invention is an improvement 2 over the invention disclosed in the aforesaid patent in that by means of noval circuit arrangements and noval mechanisms, T have been able to further reduce the number of relay magnets.

The object of the invention, therefore, is to provide an improved telephone system in which only relays and magnets are employed to perform the switching operations.

A "feature of the invention is the provision of a system of actuating and locking bars or members for controlling switching mechanisms and which are operated by common magnets under the control of the subscribers. Heretofore, mechanisms, such as 40 cross-bar switches, have been provided for establishing connections, but the" present invention, while in a manner similar to the cross-bar switch, is a distinct improvement thereon. The switch of the present invention on the other hand is adapted for instant operation, that is to say, the two necessary operations of connecting the calling line to a transfer circuit and of connecting the transfer circuit to an idle trunk are performed simultaneously.

Another feature of this invention therefore, is the provision of 'means for operating the line and trunk bars simultaneously.

840,566, flied November 25, 1919. This application filed. December 5, 1921. Serial 160. 519,857.

A further feature of the invention is a switching system wherein a plurality of coexisting connections may be established at contacts controlled by a single actuating bar or switching member of a unitary switching mechanism, the switching mech: anism comprising a plurality of cooperatlng switching members each controlling a plurality of said contacts. A portion of the actuating bars or switching members ma be assigned to serve incoming circuits suc as lines, and other bars may serve outgoing circuits such as trunks. By operating a single bar serving a plurality of incoming circuits and by operating the bars pertaining to idle outgoing circuits or trunks, one or any desired number of incoming circuits may be connected to said trunks. The same is true of each of the remaining switching bars assigned to serve other incoming circuits.

Another feature of the invention is the provision of circuit arrangements whereby any switching member of the unita mechanism which serves incoming circuits may in a series of successive operations act to establish co-existing connections between any desired variable number of incoming circuits and outgoing circuits. Any suitable means may be utilized for operating the switching members as, for exam le, electromagnets. These magnets upon eing energized operate the switching members which actuate the contact sets to establish the connections between incoming and outgoing circuits. Heretofore, the practice has been to have a common operating member of this general character which could only be utilized for setting up a single connection at any one time, since the establishment of such a connection is an 'act of appropriation and temporarily converts the apparatus from a common to an individual basis. In the present arrangement, however, in which the separately operatable switching members are freed once a connection has been established, the apparatus remains on a common basis and may be em ployed any desired number of times for establishing a plurality of co-existing connections.

In the drawings, Fig. 1 is a diagrammatic representation of the means employed in the present invention. Fig. 2 is a perspective view showing more in detail the or anizaformed thereon for the purpose of moving into position the dogs 4 which are pivotally supported on the bars 7 p at 37 The dogs 4 are normally positioned by the springs 38 and when moved into position as shown in the lower part of Fig. 1 engage or are in a position to engage the lugs 5 of switching mechanisms 8. he mechanism 8 is pivotally sup orted in the

frame members

39 and 40 an is normally held by the spring 29 with the lug 41 on projection 9 attached thereto, in engagement with stop 42 on frame member 39. When the ma et 6 is operated, the bar 7 is moved in suc a manner that the do 4 will bear against the lug 5 and rotate t e switching mechanism 8 whereby the sets of contacts controlled thereby will be closed. After the switching mechanism 8 has been rotated the projection 9 will be moved below the level of the bar 10 so that when it is moved by means of its magnet 11 the ears formed thereon suchas 12 will prevent the switching mechanism 8 from moving back to its normal osition.

The operation of this device W1 1 be more apparent from a detailed description of the establishment of a call from a subscribers line to the point where it is extended to a trunk.

Under normal conditions the bar 1 stands in an actuated position from the energization of the magnet 13. There is a circuit for magnet 13 from ground, the upper armature and back contact of magnet 11, winding of magnet 13, to battery and ground. The movement of bar 1 as hereinbefore explained, renders all of the switching devices such as 8 which are individual or are associated with the trunk 2 operable. This line of switching devices is rendered operable in that the dogs 4 associated with them are all in their actuated positions so that if any one of the line bars such as 7 is actuated the corresponding switching mechanism will be rotated andonly that switching mechanism in the row associated with the trunk 2 will be rotated.

We will assume that the substation, herein designated 121, initiates a call. The removal of the receiver from the hook will energize line relay 14 in the usual and well known manner. Relay 14 in attracting its armature places a ground on conductors 15 and 16. The ground on conductor 15 energizes the magnet 6 whereupon the switching mechanism 8 is rotated and the contacts controlled thereby are all closed. The ground on conductor 16 ener gizes the magnet 17 whereupon the swltchmg mechanism 18 is rotated and the three contacts controlled thereby are closed. The line of the substation 121 is now extended from the middle set of three contacts in'the switchin mechamsm 8 over the transfer circuit 19 t rou h the set of contacts controlledby the switc ing mechanism 18 to the "trunk 2. In amanner well known in the art, a ground will be placed on the third conductor 20 as soon as trunk 2 is seized, which will be extended through'contacts of the switchin mechanlsms to the cutofl' relay 21. .Cutof relay 21 will thereupon attract its armatures and cause the deenergization of the line relay 14.

At the time that magnets 17 and 6 became energized a circuit was closed from ground, the contact and armature of magnet 17, the conducton 22, the contact and armature of magnet 6, the conductor 23, the normal contact controlled by the innermost upper armature of magnet 11, the winding of ma et 11 to battery and ground. Throug this circuit magnet 11- becomes ener 'zed and causes the movement of the locking bar 10 whereby the switching mechanisms 8 and 18 are locked into their actuated positions. The operation of the magnet 11 eing that of a power magnet is somewhat slower than the operation of quick acting relays such as cutoff relay 21 and line relay 14. Therefore, as soon as the switching mechanisms 8 and 18 have been actuated through the energization of magnets 6 and 17 the ground will be removed from conductor 23 very shortly after magnet 11 has been energized whereupon the round on conductor 23 will not be exten ed from the contact 24 to the next magnet 25. However, the ground on conductor 20 will be connected through the contact 26 to the winding of magnet 11 to hold it energized. Through the upper armature and front contact of magnet 11 the ground for the energization of magnet 13 will be transferred to the winding of magnet 27 whereby the next trunk is selected and ready for seizure by any incoming line and magnet 13 becomes deenergized.

In this manner during the conversational period, there will be only one magnet and one relay, that is to say, magnet 11 and relay 21, tied to conductor 20 and held energized by the ground thereon.

The further extension of the call and the manner in which the substation 121 is extended to a called subscriber not being pertinent to an understanding of the present invention have not been disclosed herein.

Upon the termination of the conversational period ground is removed from conductor 20 in any well known manner and the magnet 11 releases whereby the bar 10 is, through the agency of the spring 28, re-

All

individual amsgrrr turned to its normal position and the switching mechanisms 8 and 18 by means of their springs such as 29 are returned to their normal positions. Such a disconnection is ractically instantaneous. Through the brea ring of the connection to the third wire the outed relay 21 is deenergized.

lit during the existence of a connection established as previousl described from the substation 121 to the i la trunk 2, a second substation 111 in the same subgroup as substation 121 initiates a connection, line relay 34, individual to the line of substation 111, becomes energized and at its inner armature contact again establishes the previously traced circuit for the line bar mag net 6, which is common to all of the lines or the sub roup to which substations 111 and 121 be ong. At its outer armature contact, line rela 34 establishes a circuit for ma et 35. n a manner previously

descrr ed magnets

6 and 35 become energized and operate their respective bars. Since at this time magnet 27 of the bar appertainin to the next idle trunk 36, is in an operated condition the switching mechanisn is 32 and 33 are operated through the operation of

magnets

6 and 35, respectively, and the substation 111 is thereby connected to the trunk 36. Following the establishment of the connection between substation 111 and trunk 36, the

magnets

6 and 35 become decnergized in the manner previousl described and the connection is maintains through the operation of the locking magnet 25. in this manner magnet ti may be repeatedly operated to serve in the establishment oi a plurality of coexistin connections.

What is claimc is:

1. In a telephone system, a group of calling lines, a group of transfer circuits, a trunk line, a switchin mechanism to connect said lines to sai transfer circuits, a switching mechanism individual to each transfer circuit to connect said transfer circuits to said trunk line, an actuating bar for rendering said switching mechanisms operative, a magnet common to said calling lines to actuate said first switching mechanism. when made operative b said actuating bar, and a magnet indivi ual to each of said lines to actuate a particular one of said switching mechanisms when made operative by said actuating bar.

till

2. In a telephone system, a group of call ing lines, a group of transfer c1rcuits, a trunk line, a switchin mechanism to connect said lines to sai transfer circuits, a switching mechanism individual to each transfer circuit to connect said transfer circuits to said trunk line, an actuating bar for rendering said switching mechanisms operative, a magnet common to said calling lines to actuate said first switching mechanism when made operative by said actuating bar, a magnet individual to each of said calling lines to actuate a particular one of said individual switching mechanisms when made operative by said actuating bar, and means to o crate said common magnet and one of sai individual magnets simultaneously.

3. In a telephone system, a group of calling lines, a group of transfer circuits, a trunk line a switching mechanism to, connect said lines to said transfer circuits, a switching mechanism individual to each transfer circuit to connect said transfer circuits to said trunk line, an actuating bar for rendering said switching mechanisms operative, a magnet common to said lines to actuate said first switching mechanism when made operative by said actuating bar, a magnet individual to each of said lines to actuate a particular one of said individual switching mechanisms when made operative by said actuating bar, and a locking bar for locking said actuated switching mechanisms against release.

d. In a telephone system, a group of calling lines, a group of transfer circuits, a trunk line, a switching mechanism to connect said lines to said transfer circuits, a switching mechanism individual to each transfer circuit to connect said transfer cir cuits to said trunk line, an actuating bar for. rendering said switching mechanisms operative, a magnet common to said lines to actuate said first switching mechanism when made operative by said actuating bar, a magnet individual to each of said switchin mechanisms when made operative by sald actuating bar, means 'to operate said common magnet and one of said individual magnets simultaneously, and a locking bar for locking said actuated switching mechanisms against release.

5. In a telephone system, a group of calling lines, a group of transfer circuits, a trunk line, a switching mechanism to connect said lines to said transfer circuits, a switching mechanism individual to each transfer circuit to connect said transfer circuits to said trunk line, an actuating bar for rendering said switching mechanisms operative, a magnet common to said lines to actuate said first switching mechanism when made operative by said actuatin bar, a magnet individual to each of sai lines to actuate a particular one of said individual switching mechanisms when made operative by said actuating bar, and a locking bar under control of a calling line for locking said actuated switching mechanisms into their actuated positions.

6. In a telephone system, a group of calling lines, a group of transfer circuits, a trunk line, a switching mechanism to connect said lines to said transfer circuits, a switching mechanlsm individual to each IOU trarisfer circuit to connect said transfer circuits to said trunk line, an actuating bar for rendering said switching mechanisms operative, a magnet common to said lines to actuate said first switching mechanism when made 0 erative by said actuating liar, a magnet in ividual to each of sa d lines to actuate a particular one of said'individual switching mechanisms when made operative b said actuating bar, means to operate sai common magnet and one of said individual magnets simultaneousl and a locking bar under control of a ca ling line for locking said actuated switching mechanisms into their actuated positions.

7. In a telephone system, a plurality of groups of lines, a grou of trunks, a grou of transfer circuits individual to each trun in said group a switching mechanism individual to each of said transfer circuits, a mechanism individual jointly to group of lines and each said switchin each sai grou divi ual to each said trunk for rendering said switching mechanisms individual to said trunk operative, means for noally holding one of said trunk bars in an opera tive position, means responsive to the calling condition of one of said lines for actuating said switching mechanism individual jointly to the group of lines including said calling line and said group of transfer Oil? cuits individual to said trunk whose trunk bar has been operated to connect each of said lines in the group including said calling line to a transfer circuit, means also responsive to the calling cnndition of said line for actuating said switching mechanism individual to that transfer circuit connected to said callin line for connecting said calling line to said trunk, and means for locking said actuated switching mechanism into their actuated positions.

8. In a telephone system, a urality of groups of lines, a group of trun l s, a grou of transfer circuits individual to each trun in said group, a switching mechanism in dividual to each. said transfer circuit, a

switching mechanism individual jointly to each said group of lines and each said grou of transfer circuits, a trunk bar individua to each said trunk for rendering said switching mechanisms individual to said transfercircuits of the group individual to said trunk operative, means for normally holding one of said trunk bars in an operative position, means responsive to the callin condition of one of said lines for actusting said switching mechanism individual jointly to the ramp of lines including said calling line an said up of, transfer circuits individual to said trunk, whose trunk bar has been operated to connect each of said lines in the group including said cell-- line to the transfer circuit, means of transfer circuits, a trunk bar in responsive to the callin condition of id switching mecha- Y into their actuated position and means un== der control of said ca 1"ng ling said lockin 9. In a telepone system, a plurality of groups of lines, a up of of transfer circuits individual to each in said group, a switching mechanism indi-= vidual to each said transfer circuit, a switching mechanism individualjointly to each of said group of lines and each said of transfer circuits, a trunk bar inual to each said trunks forrendering sa d switching mechanisms individual to said transfer circuits of the group individual to said trunk operative, means for normally holding one of said trunk hare in an operative position, means responsive to the calling condition of one of said lines. for actuating said switching mechanism individual jointly to the group of lines inmeans for releasing said trunk bar.

10. In a telephone system, a plurality of groups of lines, a group of trun s, a grou of transfer circuits individual to each trun line for controlwe a gram ice I in said 1 a'switching mechanism individual to eac said transfer circuit, a switching mechanism individual jointl to each said M of lines and each sai group of trans er circuits a trunk har individual to each said trunk for rendering said switching mechanisms individual to said transfer circuits of the group individual to said trunk operative, means for normally holding one c said trunk bars in an o erative means responsive to the ca ing con ition 0 one of said lines for actuating said switch:-

ing mechanism individual jointly to the osition group of lines including said callin line and asserts? switching mechanisms operative, and a magtit) net individual to each of said switching mechanisms to actuate said switching mechanisms when made operative by said actuating bar.

12. In a telephone system, incoming lines, groups of transfer circuits, outgoing lines, switching mechanisms, incoming line magnets, outgoing line magnets corresponding in number to the number of transfer circuits in a group, and bars individual to each said group of transfer circuits cooperating with said magnets to actuate said mechanisms to extend said incoming lines through said transfer circuits to said outgoing lines,

13. In a telephone system, incoming lines, groups of transfer circuits, outgoing lines, separately movable switching mechanisms, incoming line magnets, outgoing line mag" nets corresponding in number to the number of transfer circuits in a group, and bars coo crating with said magnets to actuate a p urality of said switching mechanisms to extend said incoming lines through said transfer circuits to said outgoing lines.

14 In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connectin said incoming lines to said transfer circuits, separately movable switching mechanisms for connecting said transfer circuits to said outgoing lines, magnets for said switching mechanisms, and bars for cooperating with said magnets to actuate a plurality of said switching mechanisms whereby said incoming lines may be extended through said transfer circuits to said outgoing lines.

15. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connectin said incoming lines to said transfer circuits, separately movable switching mechanisms for connecting said transfer clrcuits to said out oing lines, magnets for said switching mechanisms, and bars cooperating with said magnets to simultaneously actuate a plurality of said switching mechanisms whereby said incoming lines may be extended through said transfer circuits to said outgoing lines.

16. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connectin said incoming lines to said trader cir cu1ts, separately movable switching nisms for connecting said transfer circuits to said out oing lines, magnets "for said switch ing mec anisms, and bars cooperating with said magnets to selectively actuate a lurality of said switching mechanisms w ereby said incoming lines may be extended through said transfer circuits to said outgoing lines.

17. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately operable switching mechanisms for connecting said incoming lines to said transfer circuits, separately operable switching mechanisms for connecting said transfer circuits to said outgoing lines, incoming line magnets each having control over a plurality of said first mentioned switching mechanisms, outgoing line magnets each having control over a plurality of said latter switching mechanisms, bars cooperating with said magnets whereby a single one of said mech= anisms controlled by each of said magnets may be actuated in conjunction with such of said magnets as are actuated, and means for simultaneously operating an incoming line magnet and an outgoing line magnet to connect an incoming line through a transfer circuit to an outgoing line.

18.. in a telephone system, incoming lines,

transfer circuits, outgoing lines, separately operable switching mechanisms for connect ing said incoming lines through said transfer circuits to said outgoing lines, incoming line magnets, outgoing line magnets, actuating bars operated by said magnets, magnets for rendering said bars efiective to actuate switching mechanisms, and means for simultaneously operating an incoming line magnet and an outgoing line magnet to actuate said switchinglmechanisms to connect the inconting line t rough a transfer circuit to an out going line.

19. In a telephone system, incoming lines, groups of transfer circuits, outgoing lines, separately movable switching mechanisms, incoming line magnets, outgoing line magnets corresponding in number to the number of transfer circuits in a group, and bars cooperating with said magnets to actuate a plurality of said switching mechanisms to em tend coexisting connections from said in coming lines through said transfer circuits to said outgoing lines.

20. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms individual to each of said transfer circuits for connecting them to said outgoing lines, ma ets for said switchi mechanisms, and ars for cooperating wi said magnets to actuate a plurality oi said switching mechanisms whereby coexisting Nil lid

connections may be extended from said incomin lines through said transfer circuits to sai outgoing lines.

21. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecta ing said incoming lines to said transfer circuits, se aratel movable switchlng mechanisms in ividua to eachof said transfer circuits for connecting them to said outgoing lines, ma nets for said switchin mechanisms, and ars coo crating with sai magnets to simultaneous y actuate a plurality of said switching mechanisms whereby coexisting connections may be extended from said incoming lines through said transfer circuits to said outgoing lines.

22. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms individual to each of said transfer circuits for connecting them to said outgoing lines, ma nets for said switchin mechanisms, and are cooperating with sai magnets to selectively actuate a plurality of said switching mechanisms whereby coexisting connections may be extended from said incomin lines through said transfer circuits to sald outgoing lines.

23. In a telephone system, incomi lines, transfer circuits, an outgoing line aving multiple contacts corresponding to said transfer circuits, separately movable switching mechanisms, incoming line magnets, an

outgoing line magnet, a single operating magnet for each of said transfer circuits, and means to operate an incoming line magnet, a transfer circuit magnet and an outgo ng line magnet to actuate a plurality of said switching mechanisms to extend an incoming line through a transfer circuit to sald outgoin line.

24. In a te ephone system, incoming lines, groups of transfer circuits, outgoing lines, separately movable switching mechanisms, incomlng l1ne magnets, outgoing line magnets corresponding in number to the number of transfer circuits in a group, and bars cooperating with said magnets to actuate a plurality of said switching mechanisms to extend said incoming lines through one of said groups of transfer circuits to one of said outgoing lines.

25. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connectmg said incoming lines to said transfer circults, separately movable switching mechanisms individual to said transfer circuits for connecting them to said outgoing lines, magnets for said switching mechanisms and bars for cooperatin with said magnets to actuate a plurality 0 said switching mechanisms mea t whereby said incoming lines may be extended through said transfer circuits to said outgoing lines.

26. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circults, separately movable switching mechanisms individual to said transfer circuits for connecting them to said outgoing lines, and a pluralit of bars for controlling and operatln sai switching mechanisms, certain of said are maintaining said switching mechanisms in operationindependently of mechanical connectionto said other bars which assisted in the operation of said mechanisms.

27. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circults, separately movable switching mechanisms individual to said transfer circuits for connecting them to said .iutgoing lines, bars for preparing said st etching mechanisms for operation, other bars cooperating mechanically with said first bars for causing and maintaming the operation of said prepared switching mechanisms, and means for returning said first bars to a normal position independent of any mechanical connection with said operated switching mechanisms.

28. In a tele hone system, incomin lines,-

transfer circuits, outgoing lines avin multiple contacts corresponding to sai transfer circuits, separately movable switching mechanisms, incoming line bars, outgoing line bars, and bars cooperating with said line bars to actuate and maintain actuated said switching mechanisms to extend said incoming lines through said transfer circuits to said outgoing lines, said switching mechanisms being maintained in operated condition independently of said line bars.

29. In a telephone system, incomin lines, transfer circuits, outgoing lines avin multi 1e contacts correspondin to sai trans er circuits, separately mova le switchin mechanisms, incoming line bars, outgolng line bars, and bars cooperating with said line bars to actuate andmaintain in actuated condition said switching mechanisms to extend said incoming lines through said transfer circuits to said outgoing lines said switching mechanisms being maintained in operated condition independently of any mechanical connection with said line bars.

30. In a telephone system, incomin lines, transfer circults, outgoing lines avin multiple contacts correspondin to sai transfer circuitaseparately mova le switching mechanisms to connect said incoming lines to said transfer circuits, separately movable switching mechanisms to connect said transfer circuits to said outgoing lines,

ill

name

incoming line magnets, outgoing line magnets, bars cooperating with said magnets to actuate a plurality of said mechanisms and a circuit for controlling said bars controlled by said incoming line magnets and said outgoing line magnets.

31. in a telephone system, incoming lines, transfer circuits, outgoing lines having multiple contacts corresponding to said transfer circuits, separately movable switching mechanisms to connect said incoming lines to said transfer circuits, separately movable switching mechanisms to connect said transfer circuits to said outgoing lines, incoming line magnets, outgping line magnets, bars cooperating wit said magnets to actuate a plurality of said mechanisms and a circuit for controlling said bars jointly controlled by said incoming line magnets and said outgoing line magnets.

32. In a telephone system, 111001111111 lines, transfer circuits, an outgoln line aving multiple contacts corresponing to said transfer circuits, separately movable switching mechanisms, incoming line magnets, outgoing line magnets, transfer circuit magnets, hare controlled by said magnets for actuating said switching mechanisms to extend said incomin lines through said trans- "fer circuits to said outgoing line and a circuit for said transfer circuit magnets controlled hy said incoming line magnets and said outgoing line magnets 33. lln a telephone system, incomin transfer circuits, an outgoin line aving multiple contacts correspon in to said transfer circuits, separately movaole switching mechanisms, incoming line magnets, outgoing line magnets, transfer circuit magnets, bars controlled by said magnets for actuating said switching mechanic to em lines,

tend said incomin lines through said transfer circuits to sai outgoing line and a cirsuit for said transfer circuit magnets jointly controlled by said incoming lme magnets and said out oing line magnets.

34. In a te ephone system, incoming lines, transfer circuits, an outgom line havin multi le contacts correspon ing to i trans er circuits, said outgoing line comprising a pair of talking conductors and a release trunk, separately movable switching mechanisms, incoming line magnets, outgoing line magnets, transfer circu1t magnets, bars controlled by said magnets for actuating said switching mechanisms to extend an incoming line through one of said transfer circuits to said outgoing line, a circuit for said transfer circuit magnets controlled by said incoming line magnets and said outgoing line magnets and means for shifting the control of said transfer circuitmagnets from said line magnets to said release trunk.

35, In a telephone system, groups of incoming lines, groups of transfer circuits, outgoing lines each having multiple contacts corresponding to the number of transfer circuits in a group, incoming line magnets, transter circuit magnets, out oing line magnets and bars under contro of said magnets to extend said incoming lines through said transfer circuits to said outgoing lines, and a circuit interlinking said transfer circuit magnets with means controlled by said magnets incident to the op eration of one of said magnets for repa ring for operation the next in order ile one oil said magnets lln witness whereof, ll hereunto subscribe my name this 2nd day of December, A. D.

CHARLES L. GQQDRUM.

til

"-D HSCL/ LHMER.

l, 4r 8et,'l 71.U harks-L5 Goodwin, New J8, 19 24." Disclail ignee, lVeste'iija lzlec tz ic i(,"o mpany,-

the said claims of said Letters Patent which are dated February -Hereby enters i this disclaimer" in the following words, to wit:

11. In a telephone system, i

switching mechanisms to connec said transfer circuits, an actuatin operative, and a magnet individua said switching mechanisms when 14. In a telephone system, inc rately unovable switching mecha transfer circuits, separately movable switching mec transfer Circuits to said outgoing and bars for cooperating with said mechanisms whereby said incomin circuits to said outgoing lines.

15. In a telephone system, in rately movable and bars cooperating with said said switching mechamsn'ls wh said transfer circuits to said 0 16. In a telephone system, in

and bars cooperating with said switching mechanisms whereby switching mechanlsms for con transfer circuits, separately movable sw transfer clrcuits to said outgoln ereby said incoming lines may be extended thr utgoing lines.

York, N. Y. TELEPHONE SYSTEM. Patent her filed January 5, 1926, by the patentee,

incorporated, consenting.

ncoming lines, transfer circuits, an outgoing line, t sa1d outgoing line to said incoming hnes through g bar for rendering said swltchlng mechanisms made operative by said actuating}, bar.

oming lines, transfer circuits, outgoing lines, sepanisms for connecting said incoming lines to said hanisms for connecting said lines, magnets'for said switching mechanisms, magnets to actuate a plurality of said switching g lines may be extended through said transfer coming lines, transfer circuits, outgoing lines, sepanecting said incoming lines to said itching mechanisms for connecting said g lines,'n'iagncts for said switching mechanisms. magnets to simultaneously actuate a plurality of ough coming lines, transfer circuits, outgoing lines, sepafor connecting said incoming lines to said able switching mechanisms! for connecting said g lines, magnets for said switching mechanisms, magnets to selectively actuate a plurality of said said incoming lines may be extended through said transfer circuits to said out-going lines.

17. In a telephone s transfer circuits, separately op transfer circuits to said outgoiir over a plurallty of said first me nets each having control over a cooperating with said magnets by each of said magnets may be as are actuated, and means for and an outgoing line magnet to to an outgoing line.

18. In a telephone system, in

rately operable switching mechanisms for connectingsaid incoming lines th said transfer, circuits to said on magnets, actuating bars operated by said magnets,

g mechanisms, and means for simultaneously operating nd. an outgoing line magnet to actuate said switching incoming line through a transfer circuit to an outgoing effective to actuate switchin an incoming line magnet a mechanisms to connect the line.

20. In a telephone system, incoming lines, transfer circuits, rately movable switching mechams'ms for coi transfer circuits, separately mo said transfer circuits for connec switchlng mechanisms, and bars for coog mechanisn'is whereby coexisting connections may be plurality of said switchin lines.

ystem, incoming lines, transfer circuits,'0utg0ing rately operable switching mechanisms for co lines, sepanneeting said incoming lines to said erahle switching mechanisms for connecting said 5;" lines; incoming line magnets each having control ntioned switching mechanisms, outgoing line magplurality of said latter switching mechanisms, bars vherehy a single one of said mechanisms controlled actuated in conjunction with such of said magnets simultaneously operating an incoming line magnet connect an incoming line through a transfer circuit coming lines, transfer circuits, outgoing lines, separough tgoing lines, incoming line magnets, outgoing line magnets for rendering sald bars outgoing lines, sepamecting said incoming lines to said vable switching mechanisms individual to each of ting them to said outgoing lines, magnets for said perating with said magnets to actuate a through said transfer circuits to said outgoing l to each of said switching mechanisms to actuate oam E;

1,484,771.-0harles L. Goodmm, New York, N. Y. TELEPHONE SYs'rnM. Pate-n dated February 26, 1924. Disclaimer filed April 4, 1928, by the assignee, Wcstem Electric Company, Incorporated.

- Hereby enters this disclaimer to that part of the claims in said specification which are in the following words to wit: I

11. In a telephone system, incoming lines, transfer circuits, an' outgoing line, switchmg mechanisms to connect sa1d out oing llne to said incoming lines through said transfer circuits, an actuating bar or renderin said switching mechanisms operative, and a magnet individual to each of said swltching mechanisms to actuate said switching mechanisms when made operative by said actuating bar.

14. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms for connecting said transfer circuits to said outgoing lines, magnets for said switching mechanisms, and bars for cooperating with said magnets to actuate a plurality of said switching mechanisms whereby said incoming lines may be extended'through said transfer circuits to said outgoing lines.

15. In a telephone system, incoming lines, transfer circuits, out-going lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms for connecting said transfer circuits to said outgoing lines, magnets for saidswitching mechanisms, and bars cooperating with said magnets to simultaneously'actuate a lurality of said switching mechanisms whereby said incoming lines may be exten ed through said transfer circuits to said outgoing lines.

16. In a, telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanism for connecting said transfer circuits to said outgoing lines, magnets for said switching mechanisms, and I bars cooperating with said magnets to selectively actuate a plurality of said switch- 1 ing mechanisms whereby said incoming lines may be extended through said transfer circuits to said outgoing lines.

' 17. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately operable switching mechanisms for connecting said incoming lines to said transfer circuits, separately operable switching mechanisms for connecting said transfer circuits to said out oing lines, incoming line magnets each having control over a plurality of said rst mentioned switching mechanisms, outgoing line magnets each having control over a plurality of said latter switching mechanisms, bars cooperating with said magnets whereby a single one of said mechanisms controlled by each of said magnets may be actuated in conjunction with such of said magnets as are actuated, and means for simultaneously operating an incoming line magnet and an outgoing line magnet to connect an incoming line through a transfer circuit to an outgoing line.

18. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately operable switching mechanisms for connecting said incoming lines through said transfer circuits to said outgoing lines, incoming line magnets, outgoing line magnets, actuating bars operated by said magnets, magnets for rendering said bars effective to actuate switching mechanisms, and means for simultaneously operating an incoming line magnet and an outgoing line magnet to actuate said switching mechanisms to connect the incoming line through a transfer circuit to an out' oing line? 20. n a telephone system, incoming lines, transfer circuits, outgoing -lines, separately movable switching mechanisms'for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms individual to each of said transfer circuits for connecting them to said outgoing lines, magnets for said switch, 'ing mechanisms, and bars for cooperating with said magnets to actuate a plurality of said switching mechanisms whereby coexisting connections may extended from said incoming lines through said transfercircuits to said out omg lines.

21. In a telephone system, incoming lines, transfer cireuitfs, outgoing lines, separately movable switching mechanisms for connecting said mcomm lines to sea trster circuits, separately movable switching mechanisms indivi ual ts east 6..

- In t l h e system, incoming lines, transfer circuits, outgoing lines, sep

rately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms individual to each of said transfer circuits for connecting them to said outgoing lines, magnets for said switching mechanisms, and bars cooperating with said magnets to simultaneously actuate a plurality of said switching mechanisms whereby coexisting connections may be extended from said incoming lines through said transfer circuits to said outgoin lines.

22. 11 a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms individual to each of said transfer circuits for connecting them't-o said outgoing lines, magnets for said switching mechanisms, and bars cooperating with said magnets to selectively actuate a pluralityof said switching mechanisms whereby coexisting connections may be extended from saidincom'ing lines through said transfer circuits to said outgoing lines.

23. In a telephone system, incoming lines, transfer circuits,- an outgoing line having multiple contacts corresponding to said transfer circuits, separately movable switching mechanisn'is, incoming line magnets, an outgoing line magnet, a single operating magnet for each of said transfer circuits, and means to operatc'an incoming line magnet, a transfer circuit magnet-and an outgoing line inagnct to actuate a plurality of said switching mechanisms to extend an ncoming line through a transfer circuit to said outgoing line.

25. In a telephone system, incoming lines, transfer circuits, outgoing lines, separatcly movableswitching mechanisms for connecting said incoming lines to said I for controlling and operating said switchingmechanisms, certain 0 transfer circuits, separately movable switching mechanisms. individual to said transfer circuits for connecting them to said outgoing lines, magnets for said switching mechanisms and bars for cooperating with said magnets to actuate a plurality ofsaid switching mechanisms whereby said incoming lines may be extended through said transfer circuits to said'outgoing lines. a 26. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms individual to said transfer circuits for connecting them to said outgoing lines, and a fplurality of bars said bars maintaining said switching mechanisms in operation independently of mechanical connection to said other bars which assisted in the operation of said mechanisms.

27. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms individual to said transfer circuits for connecting them to said outgoing lines, bars for preparing said switching mechanisms for operation, other bars cooperating mechanically with said first bars for causing and maintaining the ope-ration of said prepared switching mechanisms, and means" for returning said first barsto a normal position independent of any mechanical connection with said aerated switching mechanisms.

28. In a telephone system, incoming lines, transfer circuits, outgoing lines having multiple contacts corresponding to said transfer circuits, separately movable switching mechanisms, incoming line bars, outgoing line bars, and bars cooperating with said line bars to actuate and maintain actuated said switching mechanisms to extend said. incoming lines through said transfer circuits to said outgoing lines, said switching mechanisms being maintained in operated condition independently of said line bars.

29. In a telephone system, incoming lines, transfer circuits, outgoing lines having multiple contacts corres onding to said transfer circuits, separately movable switching mechanisms, incoming line bars, outgoing lirie bars, and bars cooperating with said line bars to actuate and maintain in actuated condition said switching mechanisms to extend said incoming lines through said transfer circuits to said outgoing lines, said switching mechanisms being maintained in operated condition iude endently of any, mechanical connection with said line bars.

[ fiicz'al G settc January 26, 1.926.]

said transfer circuits for connecting them to said outgoing lines, magnets for said switching mechanisms, and bars cooperating with said magnets to simultaneously actuate a plurality of said switching mechanisms whereby coexisting connections may be extended from said incoming lines through said transfer circuits to said outgoin lines. l

22. n a telephone system, incoming lines, transfer circuits, outgoin lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms individual to each of said transfer circuits for connecting them to said outgoing lines, magnets for said switching mechanisms, and bars cooperating with said magnets to selectivelv actuate a plurality of said switching mechanisms whereby coexisting connections mav be gxtended from said incoming lines through said transfer circuits tosaid outgoing .ines.

23. In a telephone system, incoming lines, transfer circuits, an outgoing line having multiple contacts corresponding to said transfer circuits, separatelv movable switching mechanisms, incomin line magnets, an outgoing line magnet a single operating magnet for each of said transfer circuits, and means to operate an incoming line magnet, a transfer circuit magnet and an outgoing line magnet to actuate a plurallty of said switching mechanisms to extend an incoming line through a transfer circuit to salcl outgolng line.

25. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms individual to said transfer circuits for connecting them to,said outgoing lines, magnets for said switchin mechanisms and bars for cooperating with said magnets to actuate a plurality of said switching mechanisms whereby said incoming lines may be extended through said transfer circuits to said outgoing lines. 1

26. In a telephone system, incoming lines, transfer circuits, outgoing lines, separately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms individual to said transfer circuits for connecting them to said outgoing lines, and a plurality of bars for controlling and operating said switching mechanisms, certain of said bars maintalning said switching mechanisms in operation independently of mechanical connection to sald other bars which assisted in the operation of said mechanisms.

27. In a telephone system, incoming lines, transfer circuits, outgoing lines, sepa-- rately movable switching mechanisms for connecting said incoming lines to said transfer circuits, separately movable switching mechanisms individual to said transfer circuits for connecting them to said outgoing lines, bars for preparing said switching mechanisms for operation, other bars cooperating mechanically with said first bars for causing and maintaining the operation of said prepared switching mechanisms, and meansfor returning said first bars to a normal position independent of any mechanical connection with said operated switching mechanisms.

28. In a telephone system, incoming lines, transfer circuits,'outgoing lines having multiple contacts corresponding to said transfer circuits, separately movable switchin mechanisms, incoming line bars, outgoing line bars, and bars cooperating with said line bars to actuate and maintain actuated said switching mechanisms to extend said incoming lines through said transfer circuits to said outgoing lines, said switching mechanisms being maintained in operated condition independently of said line bars. I

29. In a telephone system, incoming lines, transfer circuits, outgoing lines having multiple contacts corresponding to said transfer circuits, separately movable switching mechanisms, incoming line bars, outgoing line bars, and bars cooperating with said line bars to actuate and maintain in actuated condition said switching mechanisms to extend said incoming lines through said transfer circuits to said outgoing lines, said switching mechanisms being maintained in operated condition inde endentl of an mechanical connection with said line bars.

[ fiicial azette my 1, 1928.]