US868594A - Attachment for party-line telephones. - Google Patents

Description

No. 868,594. PATENTED OCT. 15, 1907. J. H. BLYTHE.

ATTACHMENT FOR PARTY LINE TELEPHONES.

APPLICATION FILED MAY 21. 1906 3 SHEETS-SHEET 1.

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No. 868,594. PATENTBD OGT.15, 1907.

J. H. BLYTHE.

ATTACHMENT FOR PARTY LIN-E TBLEPHONES- APPLIOATION FILED MAY 21. 1906.

3 SHEETS-SHEET 2.

PATENTED OCT. 15, 1907.

' J. H. BLYTHE.

ATTACHMENT FOR PARTY LINE TBLEPHONES.

APPLICATION PILED MAY 21, 1906.

3 SHEETS-SHEET 3.

wwwoowo UNITED [STATES PATENT 0m JAMES H. BLYTHE, OF DENVER,'COLORADO.

ATTACHMENT FOR PARTY-LINE TELEPHONES.

To all whom it may concern:

Be it known that I, JAMES H. BLYTHE, a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new .and useful Improvements in Attachments for Party- Line Telephones; and I' do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use'the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in attachments for party line telephones, my object being to equip the ordinary party line instrument with such apparatus that when central rings any telephone of the party line, all 01' the other telephones will be cut out so that no other bell on the line will ring and no one else having a telephone on the line can hear the conversation carried on through another telephone.-

Heretofore so far as I am aware where party'line telephones are in use, any one whose telephone is on the line may by taking down the receiver of the instrument hear any conversation that is going on through any telephone of the line. Moreoverwhere the ordi nary party line telephones are used, the bells of all the telephones ring whene ver central calls any particular telephone.

By virtue of my improved equipment, the operator at the central office is enabled to cut out all other telephones on the line before ringing up any particular telephone. My improvements do not necessitate the running of rgt aline wires, the construction being such that it may be att aeim qgto any telephone using only the ordinary wire equipmenti :1;

Having briefly outlined my iifireved construction aswell as the function it is intended to perform, I will made to the accompanying drawing in which is illustrated an embodiment thereof.

In this drawing, Figure l is a side elevation partly in section illustrating my improved attachment. The sectional part of this. figure may be said to be taken on the line 1-1 Fig. 3. Fig. 2 is a view of the same looking in the opposite direction or a section taken on the line 22 Fig. 3 looking in vthe direction of the arrow adjacent said line. Fig. 3 =is a top plan view of the instrument. Fig. 4 is a diagrammatic view showing a number of tele- -phones with-my improved instrument attached. Fig. 50.

, Fig. 6 is asimilar view of the same device shown in a dif- Specification of Letters Patent.

I Application filed May 21,1906. Serial No. 317,902.

pleted every other telephone is cut out olthecircuit ierent position. Fig. 7 is an end elevation of Fig. 1 look- Patented Oct. 15,1907.

ing in the direction of arrow 7 on the last named figure.

Fig. 8 is an end elevation looking in the opposite direction or in the direction of arrow 8 in Fig. 2. Fig. 9 is a.

view illustrating a series of wheels 19 carrying contacts 20 differently arranged with reference to the contacts 21 for illustrating the arrangement of these wheels when used in connection with a series of telephones on the same line. From these views it will be understood that when the contact 20 of any wheel is in engagement with the brush 22, 22, the corresponding contacts'20 of all the other telephones will be disconnected from their corresponding brushes 22, 22. H

The same reference characters indicate the in all the views.

Let the numeral 5 designate a frame 'upon which are mounted two electro- mag'nets 6 and 7. I will designate the magnet 6 as the registering magnet, and the magnet 7 as the releasing magnet. provided with an armature 8 pivoted at the base of the frame as shown at 9. To the upper extremity of this armature is pivotally attached a pawl 10' acting on a ratchet wheel 12 fast on a spindle 13. Connected with this spindle and coiled around the same is a spring 14 whose extremity remote from the'shaft is connected with the frame as shown at 15. Mounted on a spindle 16, journaled in the top frame work 17 is a'locking pawl same parts The magnet (Sis 18 which also engages the ratchet wheel 12 anddooks position of the wheel 19 when none of the party line telephones is in use, is that shown in Figs. 3 and '5, that is to say with the pin 2] engaging the'springs 22 which together may be termed a brush. When this proceed to describe the same in detail reierence beings pin 21 is in this position any telephone on the line is in positionto call central. As soon as any one desires connection with any telephone on the line the operator at central by closing the circuit of the-registering mgnets 6 a given number of times depending upon the v position of the pin 20.0n thev wheel 19, with reference tothe pin 21 of the telephone to be connected,--is'enabled to bring the required pin 20 into engagement with the brush 22, 22. When this operation is com since its pin 21 is disengaged from the brush'22,' 22, and no other pin 20 is in engagement with the. hmshfl f' tive position.

every wheel is provided with threaded sockets adopted to receive a l mber f-pins corresponding withtlie" ture 8 is actuated sufficiently to move the ratchet wheel. one tooth by virtue of the pawl 1t), while the pawl- 18 number of telephones on the line, so that the wheels between the pin 20 and the pin 21 of the instrument to I be connected {for talking purposes. The ratchet wheel '12 is so constructed that every time it is.moved one tooth, the wheel 19 is moved the distance between two pins, and it will be understood that every time the circuit is closed with the registering magnet 6, the armalocks the ratchet wheel against the reverse movement and insures the closingof the telephonethrough the brush 22, 22 until the operator-at central wishes to break the connection. After the connected telephone has been used, in order to restore all the telephones to their normal calling condition or bring the pin 21 of each of my improved attachments, back into engagement with the brush 22, 22 the operator at central pushes a button or otherwise closes the circuit of the electromagnet 7 and its armature 23 as it moves to the poles of the magnet by virtue of the electro-magn etic force, acts on a screw pin 24 connected with a depending arm 25 made fast to the spindle 16 and disengagcs the locking dog 16 from the ratchet wheel 12, when the recoil of the spring 14 returns the pin wheel 19 to its-normal position with the pin 21 in engagement with the brush 2 22, 22. This occurs simultaneously at every telephone on the line though at only one of these telephones is the pin 20 of my improved attachment in engagement with the brush 22, 22. Orin other words all the telephonesexc'ept one have been completely cut out of the circuit but by closing the releasing magnet all of them are placed in position for calling central the same as before the operation'heretofore described took place.

' The circuits will be better understood by reference toFig. 4. In this view the telephones are illustrated and designated 26. In this view lot 27 designate the electricsource from one .pole of which leads a wire 28 and from the other pole a wire or conductor 29. From thewire' 28 leads a branch wire 30 to a binding post 3].. From this binding post a wire 32 leads to a point 33 from wli ich leads a wire B t to the coils of the registering magne s i while a wire 3 5 leads to the coils of the 4 releasing magnetj7. From the magnet 6 a wire 36 reads to a bindiri g post 37 and fromthis binding post-awire 38 leads tothe ground at. 39.

' The wire 29 may be said to lead to a block 40. An

I adjacent block 41 is adapted to be connected with the block '40 by a push button 42. When this push button is pressed, the contact blocks 40 and 41 are electrically connectedand when the pressure is released the two blocks are electrically disconnected. From the block I 41 leads a wire 43 to the ground at 14.

A wire {i5 leads from the line wire 28 to'the telephone 26, while a wire 46 leads from the telephone to a binding post'47 whence a wire 48 leads to one member of the brush 22, 22; The twomembers 22, 22 of this brush are separated by insulating material 49. A wire 50 .leads from the opposite brush member 22 to a brush 51 wvhosmupper extremity is connccted with a secohd line, a repetition is therefore unnecessary.

brush 52. The lower extremities of these brushes are separated by insulating material 53. A brush 54 is normally disconnected at the top from the brush 52'while its lower extremity is separated from the brush 52 by insulating material 55. branch wire 56 leads from the base of the brush 55 to the coils of the releasing magnet 7.

Above the contact block 40 is located a similar block 57- which may be connected with the block 40 by a push button 58. .From the block 57 leads a main line wire 59. From this main line wire, leads a branch wire 60 to a binding post 61 whence a wire 62 leads to the brush 52. The wiring is the samefor my improved attachment in connection with every telephone on the Assuming now that the operatorat central has received a call requiring connection with a telephone on the party line whose pin 20 is in the position shown in Fig. 5, this pin in this event being separated from the pin 21 on the wheel 19 by eight spaces. Central will now press the push button 42 eight times causing the wheel 19 to travel in the direction indicated by the arrow 5 in Figs. 5 and 6 until the pin 2011's brought into the position shown in Fig. 6, also shown by dotted lines at the attachment connected with the telephone 26 farther to the left in Fig. 4. Now it is only necessary for the operator at central to close the signal circuit which is done by pressing the push button 58 which would cause the bell of the telephone-26 in question to ring. After the person at this telephone has finished .talking, the operator first presses thepushbutton 42 which energizes the registering magn and throws the armature 8 and the pawl 10 to the forward posi- 54. Then while still pressing the push button 42-, the push button 58 is pressed. 'The pressing of this button energizes the magnet 7, since the current may be said tion, bringing the bruslu 52 in contactlivith the brush to pass from one pole oi the source 27 through the wire 28, branch wires 30, 32 and 35 through the coils of the magnet 7, the wire 56, the brush54, the brush 52 and the wires 62 and 60 through the main wire 59, through i the contact blocks 57 and 40 to the other pole of the source. The magnet 7 being energized acts on the armature 23 which in moving toward the poles of the magnet 7, acts on a screw pin 24, and causes the arm 25 to disengage the locking pawl 18 from the ratchet wheel by lifting the same. The operating pawl 10 also being in the forward position is raised above the ratchet wheelv 12 sufiiciently to allow the latter to reverse under the influence of the recoil action of the spring 14. This throws all of the pin wheels 19 of the attachments belonging to the various telephones on the line, back into' the original position or that shown in Fig. 5 of the drawing. In this event it will be understoodthat the pin wheel 19 moves in the direction the reverse oi that indicated by the arrows in Figs. 5 and 6. i

Attention is called to the fact that a contact 8 is: connected with and insulated from the armature 8 and is bent to cause its free extremity 8 topass between the two spring brushes 5.1 and 52, and form an electrical connection between the two brushes when the armature 12, the contacts 8' is disconnected 11g bzusa 52 is sought 5 1 30 can @he spring k, 4 as heretofore 6 v Aged. EM 1116 diescribezi my invention, What 1 CL. ln :1 tezeylmne utulc'nmeut folf party l1" 1 a; cmnblnatlqg with tolc bol s and the czrcuh in ilcll El ;-y are 'lomte of means controllable mm ,th central nfilce {or editing q-lwncs out of the c; n then clesing the 'liy n aneously rots;

he circuit and normally engagsu Jana fur sin? l ry contm t pin on I .hr xezrm ce to the'maln cam of any other make-91mm wheel whereb l1 l two w horns are ashamed and.

or restoring the main pins on the maku-u nd-m mk up their noruml pusition comprising an armature pro (led witlru ratchet pawl and a kicking pa wLuthe l'qck- 311g pawl buying :1' downwardly projecting 'arm whili is opersi'efi by any :suitablemoims adapted to be attached to the armature, substantially as described. V

In t nonywhex-eo fi I nL'u: my signamv'e in presence pf circuit-wa ing position, angl eleciro-mqgnetiq

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