US1111742A - Automatic toll-recorder for telephone systems. - Google Patents

Description

E. G. GODFREE. AUTOMATIC TOLL RECORDER FOR TELEPHONE SYSTEMS. APPLICATION FILED MAR.18, 1912. 1,1 1 1,742. Patented Sept. 29, 1914.

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n [mm-anal H A H uWWW v E. G GODPREE. AUTOMATIC TOLL RECORDER FOR TELEPHONE SYSTEMS. APPLICATION FILED MAR.18.191'2. 1, 1 1. 1,7423 Patented Sept. 29, 1914.

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Emms'r GRAHAM courses, or

sANimINGHAM, NEAR mnmovnme, vicironm, AUSTRALIA, 1

AUTOMATIC TOLL-RECORDER FOR TELEPHONE SYSTEMS.

Specificatioh of Letters Patent.

Patented Sept. 29, 1914.

Application filed March 18, 1912. Serial No. 684,604.

To all whom it may concern:

Be it known that I, ERNEST GRAHAM Gon- REE, a citizen of the Commonwealth of Australia, and resident of Keighley, Sandringham Road, 7 Sandringham, near Melbourne, in the State of Victoria, Commonwealth of Australia, have invented a new and useful Improved Automatic Toll-Recorder for Telephone Systems, of which the following is a specification.

This invention has been devised in order to provide a simple and inexpensive yet thoroughly reliable contrivance which will automatically record the total number of effective and individual calls made by the various subscribers or users of a telephone exchange.

The invention possesses several novel fea-' tures and as it is'not positioned in the speaking circuit the effectiveness of that circuit is not impaired. v

The basic principle underlying this invention consists in placing a consequent pole electromagnet in the circuits of telephone exchange systems. This consequent pole electromagnet is adapted to automatically close the circuit in which the registering'devices are operated only when the calling and answering subscribers are in communication. A second consequent'pole electromagnet is also insert-ed in the circuit and operates after each toll has been recorded and automatically opens the meter circuit; An open circuit is maintained during the use of the line butwhen] the calling plug is withdrawn at the close of conversation the armatureof the second consequent pole electromagnet automatically returns to its normal position.

The installation of the invention does not necessitate additional wiring and the recorder can be placed on a common-battery exchange without altering the system or upsetting the operative arrangements thereof and in most cases it takes the place of existing gear.

The improved toll recorder may be used for automatically registering the total number of effective callscontrolled .by or made by one operator and as the effective meter, circuit corresponding to set of plugs in use is immediately opened after registration of the call, such meter is immediately in readiness to. register other calls made by subscribers or other users. A reliable'check is made of all eflective calls as it only records those calls to which an answer from the subscriber with whom it is desired to communicate has been received and thereby frees the operator at the exchange from a considerable amount of work, and furtherstrument, and connections at exchange, one

coil of the magnet is energized and the lines of force or magnetic flux thus produced traverse the complete magnetic circuit through the iron core of the consequent pole electromagnet without attracting an armature which is connected in circuit with any suitable registering device. Immediately the subscriber required answers his call, for instance, by taking his receiver off the hook, a current is caused to traverse the other coil of theconsequent pole electromagnet. This coil is so wound that when energized the magnetic flux produced in the core becomes opposed to that produced by the other coil and the lines of force or magnetic flux pass through the armature which then becomes attracted to the poles of electromagnet and closes the circuit in which is operated the registering devices. Once the armature is attracted to the consequent pole electromagnet, a magnetic bridge is formed in the case of the second consequent pole electromagnet and the armature is held against the pole of the consequent pole electromagnet until the circuit through its coil is broken by the calling plug being withdrawn.

The device maybe placed in a circuit in which the operator at the exchange has the control of the recording operations by causing the automatic toll recorder to perform its function by means of apress button or its equivalent. I

It will be understood that when once the magnetic lines are produced in a definite diiron being set in a definite direction a change of that direction cannot be attained except by first opening the circuits through both coils. For instance, if the armature is attracted and the circuit through one coil opened, the path of less retardation to the lines of force roduced by the one energized coil would pro ably be through the core but according to this invention the lines of force are sent through the armature and remain so until the circuits through both coils are opened.

In order that the invention may be more readily understood it will now be described with reference to the accompanying drawings in which- Figure 1 is a view in plan of my improved automatic toll recorder for telephone systems. Fig. 2 is a view in side elevation, and Fig. 3 1s a view in end elevation. ..F1g. 4: 1s

a view in side elevation ofthe automatic toll recorder with a slight constructional modification of the armature contacts to suit its position, and operative action in the telephone circuit hereinafter described. Figs. 5 and 6 illustrate diagrammatic views of the magnetic field at various stages in the opperation of the automatic toll recorder. Fig. 7 is a diagrammatic view of the circuit illustrating the method of installing the invention in a common battery exchange telephone-circuit whereby the total elfective and subscribers calls are recorded independently of any action or control of the exchange operator. Fig. 8 is a diagrammatic view of a circuit wherein this automatic recorder is employed but where the exchange attendant controls the'automatic action. Fig. 9 illustrates a diagrammatic view of a magneto junction circuit whereby the automatic toll recorderis adapted to be operated on a system where a common battery exchange and a magneto exchange are working in conjunction. Fig. 10 is a. diagrammatic view illustrating modification of the invention wherein differentiall wound electromagnets are adapted to e inserted in the circuit and operate in lieu of the consequent pole electromagnets.

The same reference numerals indicate the same or corresponding parts throughout the continuous magnetic. circuit. and so con-' structed that magnetic influence is not brought to bear on the armature 4 placed parallel with the coils as illustrated diagrammatically in Figs. 5 and 6 until both the coils are energized which causes the lines of force produced by each coil to oppose that of the other and to traverse the armature 4 as indicated in Fig. 6. The armature therefore becomes attracted to the consequent pole electromagnet A and closed contact is made at 5 in the said consequent pole electromagnet A and the circuit opened at 6 in the consequent pole electromagnet B when the current traverses the respective circuits. The circuit in which the" register motors operate is therefore closed by operation of the consequent pole electromagnet A and reopened by operation of consequent'pole electromagnet In Figs. 1, 2 and 3 part of the invention is illustrated showing the consequent pole electromagnet A with its armature 4 in its normal position (out of contact) and Fig. 4 illustrates consequentpole electromagnet B constructed in the same way except that the armature 7 is normally in contact as hereinafter described.

The preferred construction of the consequent pole electromagnet A'is as follows The coils 1, 2 are mounted on a core 3, affixed in any suitable manner. A contact plate 8 is insulated from the core or pole piece 3 by suitable material 9 such as ebonite or the like and this plate carries the contact point 5 with which the armature 4 is adaptted to contact and close the circuit. The armature 4; is carried by a spring 10 insulated from the core or pole piece 3 by a packing piece 11. Thecontactplate 8 is preferably provided with a slot 12 and is adapted to be adjusted by the screw 13. An

adjustable keeper or screw 14 is mounted in the insulation 9 in such a manner that the armature 4 can readily maintain its operative action. Terminals 15 and 16 are pro-' vided to complete the circuit.

The consequent pole electromagnet B is constructed in approximately the same manner as the magnet'A except that the contact plate 8 is provided with an extension or contact point 6 adapted to receive the adjusting screw 17 which may also carry a lock-nut 18 '(Fig. 4:) If desired, the contact plate 8 may be adjusted as illustrated in Fig. 3. The armature 7 of this magnet B is normally in contact (Fig. 4). The coils 19 and 20 (Fig. 3) are mounted to the core 3 as above described.

When applied or inserted in a common battery exchange circuit two automatic devices as illustrated diagrammatically in Fig. 7 are used for each pair of switching plugs. The device indicated at A makes contact and completes the -meter circuit 21 and causes the meter 22 to re ister while the second magnet indicated at is brought into action after the meter 22 has registered opening the -meter circuit" 21 and maintaining an open down and held in that position until the respective circuits are opened due to the calling plug 23 being withdrawn. When the circuit is made by the automatic operation of the magnet A the meter circuit is closed and if the receiver atthe subscribers end is placed on the hook a current in the opposite.

I direction is sent through the circuit which into operation at exchange and notifies the operator. On the answering plug 24 being inserted in its socket or jack the lamp or indicator is switched out of circuit and the circuits 25 and 26 are completed from the battery 27 through switch socket or jack 28 to subscriber and circuit 29 is completed from. earth 3O battery 27 coil 31 lamp 32 sleeve 33 of plug 24 to earth 34 and causes supervisory lamp 32 to glow. The circuits 25 and 26 being completed the relay 35 becomes energized and armature 36 is brought to contact point 37. This J causes supervisory lamp 32 to become short circuitcd or cut out and extinguished due to the current passing-through coil 1 of the magnet A which is suitably wound for the purpose. hen the calling plug 23 is inserted in the jack corresponding to the number of subscriber required the current from the cen tral battery 27 flows through the circuit 38 and causes supervisory lamp 39 to glow. When the called subscriber answers, relay 40 on circuit 41 is energized, armature 42 cngages contact point 43 and supervisory lamp 39 is short circuited or cut out and coil 2 of consequent pole electromagnet A is then energized. The two coils 1. 2 of consequent pole electromagnet A now being energized, and the two subscribers in communication the. armature .4 is attracted and makes contact at 5. The batterycurrent then traverses earth 44 to battery 45 through meter 22, circuit 21, contact 6, armature 7, contact 5, armature 4, sleeve 33, contact socket 46, through service meter 47 to earth 34, completing the circuit and causing meters 22 and 47 toattract armatures 48, 49, the call being thereby registered on both recording devices 50 and 51. The armature 48 of call meter 22 when attracted makes electrical contact between 48 and 52 and a current then flows through the circuit from earth 30,. battery 27, through coil 20 over contacts 48 and to earth at 44. Both coils 19 and 20 of magnet B are then energized and armature 7 is attracted. The coil 19 being energized the whole time while calling plug 23 is in socket the armature 7 is held ina position to open the meter circuit 21 and prevent waste of electrical energy as well as to allow the total eiiective call meter 22 to be operated again only when other subscribers are put in communication. The magnet B does not allow its armature 7 to return to normal position (armature in contact) until the circuits are opened due to the calling plug 23 being withdrawn.

F 8 illustrates a relay circuit similar to Fig. 7, but in this case the automatic operation is under the control of the operator or exchange attendant. An extra press button 54 is placed in the meter circuit 21 and when connection is made between the subscribers the press button 54 under the operators control is depressed or operated and the magnets A. B. then operate automatically'as described with reference to Fig. 7. As illustrated, the armatures 4 and 7 of the consequent pole electromaguets A and B are connected as indicated at 55. The super visory lamp 32 is short circuited and extinguished due to the current passing through the coil 56.

In some common battery exchange systems resistance coils are included in the positions indicated by the coils 1, 2 and 19 in Figs. 7

and 8. By winding the coils 1, 2, in the consequent pole electromagnet A and the coil 19 of the magnet B to the same resistance as the resistance coils at present in use only the addition of the coil 20 is required. By this arrangement. the cost of installation of my system of toll recording is considerablv reduced and simplified.

According to a modification of this invention a differentially wound relay 57 (one formof which is illustrated in Fig. 10) may be'inserted, in the above circuits in lieu of the above described consequent pole electromagnets A. and B. The cores 3 of the differcntially wound electromagnets 57 are not continuous as in the other figures. The coils 1 and 19 are so wound that when energized,

the magneticcffect in the cores is not sufficient to attract armatures 4 or 7. but when the coils 2 and 20 are energized the magnet ism in the cores is augmented and the armatures4 and 7 become attracted and close or open the meter circuits as the case may be. hen coil 1 is energized the magnetic efi'ect is not sufficient to cause armature 4 to be at tracted but when coil 2 is energized in conjunction with coil 1 the magnetic effect is augmented or made greater and the armature 4 becomes attracted. The relay B similarly operates when coils 19. and 20 are energiz-ed and-the same recording operation is effected as described with reference to the consequent pole electromagnets and as illus trated in Figs. 7 and 8.

When it is desired to automatically o crate the toll recorder on telephone systems 74: in the circuit the toll recorder may be op erated While at the same time exactly the same indications may be given that take place in the present system. The'operator, at the central battery exchange end, places the plug in socket 57 and speaks to operator at the magneto exchange. The operator at the magneto exchange takes plug 58 fromits seat 59 and inserts it in the socket 60. The contacts 61, and 62, come together and current from battery 63 flows from earth 64,

over armature 65 through contacts 61 and 62 to battery 63 line 63*, contact 67 armature 66 through coil- 68, energizing same along line 69 to earth 30 (Fig. 8) at common battery exchange as indicated by the arrow. A parallel circuit from battery 63 to lamp 71, armature 70 to contacts 61 and 62 back to battery 63 is also formed which causes the lamp to glow. When the electromagnet 68 becomes energized the circuit is broken at 70 and the lamp 71 is extinguished, which intimates to the operator that the plug 58 has been inserted in the right jack. .VVhen the called subscriber answers, contacts are closed at 72 and current flows from battery 63 through coil 73 to coil or electromagnet 74 to line, over contacts 72 back to return line over contacts 61 and 62 to battery 63. This causes electromagnet 73 to attract armature 66 and close the contacts at 66 andv 80. At the common battery exchange various apparatus then perform their functions and circuit is given for transmission of 'speech in the usual manner and toll is automatically recorded on the meters 50 and 51 as hereinbefore described. Electromagincluded which gives an indication that the I plug has been inserted in the Wrong or right jack and also intimates whether the subscriber to magneto exchange has replied to the call from the common battery exchange. This may bedone by positioning the lamp 71 in circuit 82, and adapting armature 70 to contact at 78 as shown by dotted line and thus the better supervision of the operator is secured. The contact 70 under these conditions is not in circuit.

When an earth return circuit is used earth 64 is not required, the earth Wire for the general system being brought into requisition to serve the same purpose.

The circuit above described will enable the electromagnets A and B to automatically record the number of effective calls only when both subscribers are in communication on a line that is connected up to mixed systems such ascommon battery and magneto exchange systems.

Having now fully described and ascer tained my said invention and the manner in which it is to be performed, I declare that What I claim is 1. In a telephone toll recording system, a circuit, a consequent pole electro-magnet one coil of which is energized by the calling telephone, and the other coil energized by the answering telephone, an armature operated by said electro-magnet, a circuit closed by said-armature, a toll recording device adapted to be operated by the closing of said armature circuit, and a second electro-magnet arranged in the circuit to operate and open the circuit after the meter has registered.

2. In a telephone recordin system, a circuit, registering means located in said circuit, consequent pole electro-magnets adapted first to close and then open said circuit, and manually operated means for controlliing the registration, substantially as speci ed.

3. In a telephone recording system a circuit, a registering device locatedin said circuit, a consequent pole electro-magnet adapted automatically to close said circuit when the desired parties are in. communica tion, and a second consequent pole electromagnet adapted after a toll has been recorded to open the meter circuit.

1. In a telephone recording system a 011'- cuit, a registering device in said circuit, and a consequent pole elec'tro-magnet having its coils so wound that when energized the magnetic flux produced in the one opposes themagnetic flux produced in the other, and an armature adapted to become attracted by the v electro-magnet and to close said circuit.

In testlmonywhereof I aflix my signature in presence of two witnesses.

ERNEST GRAHAM GODFREE Witnesses SIDNEY 'HENDLEY, ANNIE 'EDVARDSQ Copies of this patent may be obtained for nve cents each, by addressing the Commissioner of Patents,

Washington, D. G.

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