US924714A

US924714A - Telephone system.

Info

Publication number: US924714A
Application number: US47280909A
Authority: US
Inventors: Ernest E Yaxley
Original assignee: MONARCH TELEPHONE Manufacturing Co
Current assignee: MONARCH TELEPHONE Manufacturing Co
Priority date: 1909-01-18
Filing date: 1909-01-18
Publication date: 1909-06-15
Anticipated expiration: 1926-06-15

Description

E. YAXLEY.

TELEPHONE SYSTEM.

APPLICATION FILED JAN. 18, 1909.

Patented June 15,1909.

I I WI I frizes wwf WITNESSES WMJ? k 3% EUNITED STATES PATENT OFFICE.

ERNEST E. YAXLEY, OF CHICAGO, ILLINOIS, ASSIGNOR TO MONARCH TELEPHONE MANU- FAOTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TELEPHONE SYSTEM.

Specification of Letters Patent.

Patented June 15, 1909.'

Application filed .ianuary 18, 1909.: Serial No. 472,809.

and exact description, reference being had to v the accompanying drawings, forming a part of this specification.

. Myinventionrelates to telephone exchange systems, and has for its object the provision of a system wherein a common or central source of direct current may be employed to advantage in imparting magnetism to the telephone receivers, so that such receivers nee not have permanent magnets included in their construction, whereby objections which arefamiliar to those skilled in the art are avoided.

I am aware that it is old to have a common battery of a telephone exchange system supply current to coils of telephone receivers avin soft iron cores, which coils do not errnit 0 the assage of voice currents, an to provide sue receivers with coils that are restricted to the reception of voice currents, these latter coils being incapable of receiving direct current from the common source. In such a system ofthe prior art the coils that are adapted to receive the direct or continuous current from the commonsource, are in the nature of impedance coils, so that'the voice currents are prevented from flowing to a material extent therethrough.

In the system of my invention, the coils that receive the voice currents are particularly and especially designed also to receive direct current from the common source, so that these telephone current receiving coils may supplement the companion coils in the polarization of the receivers, due to the flow of direct current. In the system of my invention, therefore, the telephone current receiving coils are well ada ted to the passage of steady currents for t e purpose stated, and, in the preferred embodiment of the invention, offer less resistance to the flowof steady current than do thecompanion coils that, in the preferred embodiment of the invention, are adapted to permit of the passage of little or no telephonic currents, but

are restricted preferably practically to .the passage of direct current.

' As another feature of the preferredforrn.

of my invention, I cause both kinds of winding of each receiverto convey direct currentto the transmitter in association therewith, so that the common battery not only per forms the functions which have been -described in connection with the'receiver, but also supplies the transmitter with straight current.

As another feature of my invention, the two kinds of winding of each receiver are in-. cluded in parallel relation with each other and together are included in serial relation with the common source of current and the transmitter associated with the receiver. By including the two windings ofeach receiver in parallel relation with each other and the two in parallel in serial relation-With the common battery, the joint resistance of said winding, which is opposed to the battery current, is much less than the resistance that would be offered to such common battery current if that winding of each receiver which is to be subject to the telephone currents were not traversed by direct current from the battery.

If in the system of, the prior art, the resistance of the impedance coil is ,sufficiently increased properly to revent the passage of voice currents theret rough, a correspondingly increased obstruction is vprovided to the passage of current from the common battery, which cannot be remedied by the system of the prior art but is remedied by the 7 system of my invention, as the parallel path which I provide about the impedance coil, and which includes the voice current receiving winding, affords passage for the direct current, so that the increased resistance in the impedance coil is compensated for and the objectionable increase in the obstruction to the path of the direct current is avoided. I am also aware-that it is old to have a single receiver winding provided for the double purpose ofreceiving voice currents and for receiving direct currents, to enable such single winding to impart magnetism to the receiver, due to the direct current, and to enable this magnetismto be modified by the voice currents traversing this single winding, but in such a system the single Winding must, be of low resistance in order to afford the' proper passage of direct current for-polarizmg the receiver magnet and for energizing the transmitter and therefore, owin to the physical-limitations as to the size. 0 there high to enable it to perform its' functions properly. Bymak1ng the telephone current receiving W1I1(i11g of lower ohmic resistance vthan'the impedance winding, I ain enabled to relieve the impedance winding of arelatively great proportion of the total direct current flowing through the line for the energization of the transmitter. By doing this I increase the impedance of the impedance winding, ,because, as is well known, the im ed ance of any coil is greater as the magnetic dhx through its core is smaller. As the magnetism in a core lpproaches the saturation point of that core,

a t ere is a marked reduction of impedance, and it is for this reason that I allow the voice current receiving winding to carry a large proportion of the current.-- The telephone current receiving winding thus aids in the polarization of the core, and at the same time aliowsa' greater effective impedance to its companion winding. As the impedance winding and the voice current-receiving winding are each wound in the same direction", the polarizingi'nfluence of the two, due to the flow of direct current through them,-are.cu'mulative, and by virtue of the fact that the voice current receiving winding is close to the diaphragm, the steady polarization of the core is effective to its extreme end, which is not the casein those receivers'of the prior art inwhich steady'cuF rentisiexcludedfrom the voice current receiyin winding. In my receiver, therefore,

both 0 the coils contribute in marked degree.

to the "pol'arizi of the receiver core, and while the two coi s are in shunt, the very h gh relative 1m ed'ance of the impedance winding serves to s unt practically all of the voice currents through the voice current receiving winding,,where they will exert a maximum efiect on the d aphra m, but any voice currents that do passt rough the, im edance windin are not lost in their effect, ut add their eifect to the effect reduced by the voice currents in the telep one current re-- ceivin winding.

I wi l explainmy invention more fully by reference to the accompanying drawing, diagrammatically illustrating1 station in connection wit a cor circuit at an exchange. The telephone line illustrated a a tele hone sub- 7 is a metallic circuit line, to which, however, I do not wish to be limited, whose sides 1 and 2 terminate respectively in tip and sleeve contacts 3 and 4 of aspring jack or jack-switch ized core, has a soft iron core provided with an impedance winding 9, through which circuit is desirably only established when'connection is established with the line at the exchange, so that said receiver is not materially magnetized when the circuit of the line is open and is suiiiciently ener ized when the common battery 7 is in close relation with the line, so that the magnetism thus imparted to the receiver is equivalent to and acts in place of the magnetism that is imparted to those receivers 'of the prior art that include permanent magnets in their construction. All of the winding 9 which is to afford -impedan'ce, is desirably disposed about the coreof the receiver, though I' do not wish to be limited in all embodiments of my invention to this arrangement.-

The winding of the receiver that is to be responsive to incoming voice currents for the pu ose of enabling the receiver to act as suc 1, is indicated at 10 in dis osition about the same core that carries t-e winding 9. The coil 10,. however, may be closer to the diaphr m 10 than the winding 9, the winding 10- eing in multiple relation with the. winding. 9, both windings 9 and 10 being in serial relation with the battery and the transmitter 5. Each receiver thus has two cir- 1 cuitsthat are in parallel, one of the circuits including winding which affords impedance to the voice'currents and produces magnetism which takes the'place of the magnetism hitherto furnished by a permanent magnet. The circuit which includes the impedance winding 9, desirably ossesses an ohmic re- 7 sistance of fifty-five o nns, while the remaining receiver circuit affords an ohmic rcsistance of forty-five ohms, so that the latter circuit, while being adapted to permit of the passa e of voice currents, preferably aiiords a pat i of lower resistance to the direct cur rent than does the former circuit. The joint resistance afforded by the two circuits of a each receiver is sufliciently low to permit cl the proper. passage of current from'thc hat-- tel-y 7 over the line and through the transmitter.

" ratus at the exchange, nor other apparatus at The switch arrangement at the substa tion may be'suited to the exchange system. I have shown a telephone switch-hook 11 having an upper contact to bring the sides of the line in conductively continuous relation when the receiver is removed.

I have shown at the sub-station a signal bell 12 of high impedance, bridged between the sides of the line, the bell bridgeincluding the condenser 13.

I have not indicated any signaling appathe exchange, as such illustration is not needed for the of my invention and as the application of the apparatus of the system of my invention will be readily understood by those skilled in the art.

It is obvious that changes may readily be made in the preferred embodiment of the invention herein shown and particularly described, without departing from the spirit of the invention, and I donot, therefore, wish to be limited to the precise features illustrated, but,

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchangefor-supplying current to the telephone line, the telephone receiver at said station including a magnetizable core and having'two circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by current from said source of direct current, and each including a winding serving to magnetize the receiver core, due to the passage of the direct current, one of said windings possessing impedance to obstruct the flow of voice current-s and the other of said windings being adapted to permit of the passage of voice currents, 'the transmitter at said station being in serial relation with the circuits of the receiver taken together, and thereby being adapted to be supplied also with current emanating from the source of direct current.

2. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station having two receiver energizing circuits in parallel relation with ecah other and in serial relation with the line and both adapted to be traversed by direct current from said source of direct current to energize the receiver, and one adapted to be traversed by voice currents while the other possesses impedance to restrict the flow of voice currents, the" transmitter at said station being in serial relation with the circuits purpose of an understanding.

being adapted to be supplied also with current emanating from the source of direct current.

3. A telephone system including a telephone line' extending between a telephone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station including a magnetizable core and having two circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by current from saidsource of direct current, and each including a winding serving to magnetiz'e the receiver core, due to the passage of the direct current, one of said windings possessing impedance to obstruct the flow of voice currents and the other of said windings being adapted ,to permit of the passage of voice currents, the transmitter at said station being in serial relation with 'he circuits of the receiver taken together. and thereby being adapted to be supplied also with current emanating from the source of direct current, the receiver circuit which is subject to the voice currents possessing lower ohmic resistance than the companion receiver circuit.

4. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station having two receiver energizing circuits in arallel relation with each other and in seria relation with the line and both adapted to be .traversedby direct current from said source of directcurrent to energize the receiver, and one adapted to be traversed by voice currents while the other possesses impedance to restrict the flow of voice currents, the transmitter at said station being in serial relation with the circuits being adapted to be supplied also with cur rent emanating from the source of direct current, the receiver circuit which is subject to the voice currents possessing lower olnnic resistance than the companion receiver circuit.

5. A telephone system including a telephone line extending from a telephone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station'including a magnetizable core and having two circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by current from said source of direct current, and each including a winding serving to mag netize the receiver l the direct current, one of said windin s pos sessing impedance to obstruct the low of of the receiver taken together, and therebyof thereceiver taken together, and'thereb) core, due to the passage ofcurrent atthe exchange for supplyingcurrentvoice currents and the otherof said windings being adapted to permit of the passage of voice currents.

6. A telephone system including a tele-' phone line extending between a telephone station and an exchange, a source of direct to the telephone line, the'telephone receiver at said station having two receiver energizing circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by direct current relation with each other andin serial relation with the line and both adapted to be trav-- ersed by current fromsaid source of direct current, and each including a winding serving to magnetize the receiver core, due to the passage of the direct current, one of said windings possessing impedance toobstructthe flow of voice currents and't-he other of said windings being adapted to permit of the passage of voice currents, the receiver circuit which is subject to the voice currents possessing lower ohmic resistancethan the coinpanion receiver circuit.

8. A telephone system including a telephone line extending between a telephone station and anexchange, a source of direct current .at the exchange for supplying current to the telephone line, the telephone receiver at said station having two recelverenergizing circuits in parallel relationwith each other and in serial relation with the line and both adapted to be traversed by direct current from said source of direct current, to energize the receiver, and one adapted to be traversed by voice currents while the other possesses impedance to restrict the 'flow of voice currents, the receiver circuit which is subject to the voice currents possessing lower ohmic resistance than the companion receiver circuit.

9. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station including a magnetizable core and having two circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by current from said source of direct current, and

each including a winding servingto' mag at said station havin netize the receiver core, due to the assage of the direct current, one of said win ings serving to permit of the passage of voicecur to be-supplied also with current emanating from, the source of direct current. I

10. .A telephone system including .a telephone lineextending between a telephone station and an exchange, a source of direct current at the exchange for-supplying current to the telephone line, the telephone receiver g two receiver 'energizin circuits in paral el relation with each otner and in serial relation with the lineand both adapted-to betraversed by direct ourrent from said source-of direct current, to

energize the receiver, one of said windings serving to permit of the passage ot voice currents, the transmitter at said stationbeing in serial relation with the circuits of the receiver taken together, and therebyv being adapted to be supplied also with current emanating from the source ofdirect current.

11. A telephone system including a 'telephone line extending between a telephonestation and an exchange, a source. of direct current at the exchange for supplying current to the telephone line, the telephone receiver at'said station including a magnetizable core and having two circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by current from said source of direct current,

and each including a winding serving to.

magnetize the receiver core, due to'the passage of the direct current, one of said wlndings serving to permit of the passage of voice currents, the transmitter at said station'being in serial relation with the circuits of the receiver taken together, and thereby being adapted to be supplied also with current emanating from the source of direct current, the receiver circuit which is subject to the voice currents possessing lower ohmic resistance than the companion receiver circuit.

12. A telephone system including a telephone line extending between a'telephone station and an exchange, a sourcevof direct current at the exchange for sup lying current to the telephone line, the te ephone receiver at said station having two receiver energizing circuits in parallel relation with each. other and in serial'relation with the line and both adapted to be traversed by direct current from said source of direct current, to energize the receiver, one of said windings serving to permit of the passage of voice currents, the transmitter at said station being in serial relation with the circuits of the receiver taken together, and thereby being adapted to'be supplied also with current, emanating from the source of direct current, the restation and an exchange,

currents possessing lower ohmic resistance than the companion receiver circuit 13. A telephone system including a telephone line extending between a telephone a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station including a magnetizable core and having two circuits in parallel relation,

with each other and in serial relation with the line and both adapted to be traversed by current from said source of direct current, and each including a winding serving to magnetize the receiver core, due to the passage of the direct current, one of said windings serving to permit of the passage of voice currents.

14. A telephone system including a telephone line extending between a telephone stationandan exchange, a source of direct current atthe exchange for supplying current to the telephone line, the telephone receiver at said station having two receiver energizing circuits in parallel relation with each other and in serial relation with the line.- and both adapted to be traversed by direct current from said source of direct current, to energize the-receiver, one of said windings serving to permit of the passage of voice currents.

15. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange rent'to the telephone line, the telephone receiver at said station including a magnetizfor supplying cur' able core and having two circuits in parallel relation with each other and in serial relation with the line and both adapted'to be traversed by current from said source of direct current, and each including a winding serving to magnetize the receiver core,

due to the of said win sage of voice currents, the nvhich is subject to the voice currents possessing lower ohmic resistance than the companion receiver circuit. 16.-A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange for sup lying current to the telephone line, the te ephone re ceiver at said station having two receiver energizing circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by direct current from said source of direct current, to energize the receiver, one of said windings serving to permit of the passage of voice currents, the receiver circuit which is subject to the voice currents possessing lower ohmic resistance than the companion receiver circuit. a

' In witness whereof, I hereunto subscribe my name this sixteenth day of J anuary A, l).

Eli NEST E.- YAXLEY.

assage of the direct current, one ings serving to permit of the pas- Witnesses:

L. G. Srnon, G. L; CRAGG.

receiver vcircuit DISCLAIMER- 92%,? 1ei.E'7nest E. YawZey, Chicago, Ill. TELEPHONE SYSTEM. Patent dated June 15, 1909. Disclaimer filed January 3, 1913, by the assignee, illonarc/z Telephone lllemngfaczf'wing Company.

Enters his disclaimer To that part of the claim in said specification which is in the following Words, to wit:

9. A telephone system including a telephone line extending between a tele phone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station including a Inagnetizable core and having two circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by current from said source of direct current, and each including a winding serving to magnetize the receiver core, due to the passage of the direct current, one of said windings serving to permit of the passage of voice currents, the transmitter at said station being in serial relation with the circuits of the receiver taken together, and thereby being adapted to be supplied also with current emanating from the source of direct current.

10. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station having two receiver energizing circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by direct current from said source of direct current, to energize the receiver, one of said windings serving to permit of the passage of voice currents, the transmitter at said station being in serial relation with the circuits of the receiver taken together, and thereby being adapted to be supplied also with current emanating from the source of direct current.

13. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange for supplying current to the telephone line, the telephone receiver at said station including a magnetizable core and having two circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by current from said source of direct current, and each including a winding serving to magnetize the receiver core, due to the passage of the direct current, one of said windings serving to permit of the passage of voice currents.

14s. A telephone system including a telephone line extending between a telephone station and an exchange, a source of direct current at the exchange for sup plying current to the telephone line, the telephone receiver at said station having two receiver energizing circuits in parallel relation with each other and in serial relation with the line and both adapted to be traversed by direct current from said source of direct current, to energize the receiver, one or said windings serving to permit of the passage of voice currents.

[Ojicial Gazette, January 14, 1913.]