US846327A - Calling device for telephone-exchanges. - Google Patents

Description

PATENTED MAR. 5. 1907.

:F. A. LUNDQUIST. CALLING DEVICE FOR TELEPHONE EXCHANGES.

APPLIOATION FILED JUNE 13. 1904.

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APPLICATION FILED JUNE 13. 1904.

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flwwmwz r fwwflwwa No. 846,327. 'PATENTED MAR. 5. 1907.- F. A. LUNDQUIST.

' CALLING DEVICE .FOR TELEPHONE EXCHANGES.

1 APPLICATION FILED JUNE 13, 1904.

6 SHEETS-BHEET 3- l hm No. 846,327. PATENTED MAR. 5, 1907.

P. A. LUNDQUIST. CALLING DEVICE FOR TELEPHONE EXCHANGES.

I APPLICATION FILED JUNEIB, 1904.

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No. 846,827. PATENTED MAR, 5, 1907. F. A. LUNDQUIST.

CALLING DEVICE FOR TELEPHONE EXCHANGES APPLICATION EILED JUNE13. 1904. v

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PATENTED MAR. 5,1907.

F. LUNDQUIST. CALLING DEVICE POE TELEPHONE EXCHANGES.

APPLIOATION FILED JUNE 13, 1904.

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FRANK A. LUNDQUIST, OF CHICAGO, ILLINOIS. CALLING DEVICE FoR TELEPHONE-EXCHANGES.

Specification of Letters Patent. Application filed June 13,1904. Serial No. 212,325.

Patented March 5,1907.

To all whom it may coiicern. a

Be it known that I, FRANK A. L nn msT, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Calling Devices for Telephone-Exchanges, of which the following is a specification.

My invention relates to calling devices for telephone-exchanges, and has for its object improvement in the construction and operation of such devices.

In the accompanying drawings, Figure 1 is an elevation of the device. Fig. 2'is an enlarged elevation with the front cover removed and showing the parts in their normal position. Fig. 3 is a similar elevation showing the parts as they appear while operating tomake acall. Fig. 4 1s an elevation similar to Fig. 2, partly in section and with the front parts removed, so as to show the interior mechanism. Fig. 5 is a detail in side elevation of some of the contact-making parts of Figs. 2 and 3. Figs. 6 and 7 are sections on lines 6 and 7, respectively, of Fig. 5. -Fig. 8 is a condensed and simplified diagram of cen-' tral-office mechanism adapted to be used in connection with the calling device, and Fig. 9 is a diagram representing a series of local stations on two party-lines running from the central office.

In they said drawings, C is a box upon the front face of which is a numbered and rotatable dial D, mounted upon a spindle D, .to which it is secured. Aspring D normally holds the dial with its zero-point adjacent to ointer D. This normal osition is determlned by a pin E on the spmdle E, which spindle isconnected to the spindle D by a train of gears, as shown in Fig. 4.

In its normal position the pin E rests .be tween and is held stationary by the pivoted levers E and E The lever E is normally held inv the position shown in Fig. 4 by a spring E The lever E has no such sprmg, place at which it is put until moved to a different position.

- The large gear D. is connected to the spindle D by aratchet mechanism (not shown) which permits the spindle to be turned in one direction without turning the gear, but which drives the gear when turned in the 0p posite direction. I A hand-wheel 'D is the means by which the spindle D and the disk or dial D are the ever E clear of the pin E.

turned'by hand in the directionof the arrow in Fig. 1- without moving the gear D, which forms part of the train of gearing between spindles D and E. In doing this the levers 1*] and E do not release the pin E until a further operation. Consequently the dial may he set by hand forany indication, and it will remain at this place'until it is desired to have it move. The lever E slot 0 of the plate C, which forms part of the frame that holds the mechanism. On the spindle D is an arm D, which when the sp ndle is in its normal position strikes the. lever E and holds its of the pin E. On the other end of the lever E is a piece of insulation E which when the lever is held in its normal position by. the arm D strikes spring 25 and closesit to contact withspring 26. i

Iivoted at a convenient place on theplate C is a lever F, which is normally held in an elevated position by spring F. On the lever F is a spring F which engages the end of lever E to move it away from springs 25 and 26 and from the pin it when the arm D has been moved from its shown in Fig. .3. shown in Fig. 2, ver F would only without moving lever E 1 Assuming the dial-D. to have been s jet at any indication and the arm D inoved away from lever E then a'depression of the lever F will release the pin E, and the said pin will move away from the end of, lever E This motion is by virtue of the spring D opcal; se the spring F 2 to yieldv extends through a a lower end in the path normal position, as

erating through the train of gears upon the spindle E. As the pin E approaches the lever E from the other side it pushes said lever outward, so that it can pass. Secured to the lever E is a disk E havin anotch E. Pivoted at a convenient point is a lever E,

ada ted to engage the notch E", so as to hold v A spring E furnishes the force for this holding action. Secured at some-convenient place on the. spindle D is an arm the end of which is indicated by dotted lines at E in Fig. 4; When the spindle D is at its normal position, the arm 1L strikes the lever E and moves it away from the notch E but as soon as the spindle has been advanced the spring E will throw the lever E into position to en age notch E as soon as pin E has moved ever E outward.

The general construction and operation so far described is that the dial D may be set at any indication desired and will remain at that place until released by a pressure on the lever or-ke the dial runs back to its normal position, where it stops and is locked. This stopping and locking is primarily ell'ected by the arm D pushing the lever 15* into the path of the pin E and secondarily by the arm E releasing the lever E so that the spring E may force the end of lever E behind the pin E. This last action prevents a rebound of the mechanism when suddenly stopped.

On the spindle E is a ratchet-wheel E, which is connected by means of a pawl with a governing device E These parts are so arranged that when the spindle is driven forward by spring D the ratchet-wheel drives the governor, and the governor acts to regulate the speed of rotation. When the spindle E is suddenlystopped by pin E and lever E the pawl of the governor'ridcs over the teeth of the ratchet-wheel until stopped by friction. By this means the governor is not instantly stopped, and the pin E is relieved of a corresponding amount of impact; otherwise the governing mechanism is of a wellknown form, Also secured on the spindle E is a cam 4,' and supported at a convenient.

.an electrical contact 'with the spring 3 for each rotation of the spindle E. In its normal position the cam is not in contact with the spring The train of gearing between spindles l) and E is so related to the numbering on the dial D that the cam 4 makes one electrical contact with the spring 3 for each time the dial moves a distance equal to that between one graduation and the next.

The receiver-hook II is pivoted on ashaft H and when not depressed by the weight of the receiver It is held in an elevated position by a spring H. Also on the shaft is segment of a gear U, which is moved downward by a spring H which has one end attached to the segment ll and the other end to a projection on the hook H. ()n the hook H is a pin 11 that projects into aslot II in the segment l-l The spring 11 normally holds II and 11 in the relative position shown in the drawings; but if the segment be restrained from movement when the hook is in its elevated position then the hook may be moved downward while the. se ment remains stationary or moves downward at a slower speed. In such a case the pin I1 travels in the slot ll.

on a stud J is a gear J and three camshaped projections J", J, and J". These parts are all fastened together, and in the diagram Fig. 9 the cams are condensed into one and designated by the numeral 21. The gear .Vmcshes with the segment 11 and by suitable gearing and ratchet-wheel is connected with; an escapemcnt J of these parts is to regulate the speed of the F. When this release occurs,-

The object downward movement of the segment H While not restricting its upward movement. Supported at a convenient place are five insulated contact-springs which make and.

break electrical connection with the cam-surfaces that turn on the stud J. When the hook I1 is at its lowest pbsition, connection is to the spring 20, the other springs being out of electrical connection. When the hook H is at its highest position, the connection is to springs 28 and 40. When the hook is passing between its extreme positions, the connection is to springs 30 and 31.

Secured t0 the plate 0 is a lever L, having three arms or projections. One of these ,L, is insulated and normally rests adjacent to but separated from a contact 1. A second one of these arms rests adiacent to a pin F on the lever F. The third arm projects adjacent to a pin J, which is carried by the cam-body that turns on stud J. When the hook H is in its lowest position, the pin J engages the lever L and moves the part L out of connection with the contact I. When the hook rises, the pin J moves away and'leaves Lin condition to be moved by depressing lever F, thus bringing L into contact with I. The lever L stays in the place it is put until niovedby either pin J or by pin F on lever F. Connection between L and I throws the battery-lire to springs 3 and 30, through either of which impulses are sent by the movement of their adj acent' cam-surfaces.

Upon removing the receiver R from its hook the said hook rises and rotates the cam-suil'aces on stud J (21 of Fig, 9) and makes and breaks connections with the adjacent springs. As there is no battery connection until the lever F has been moved and this movement is not made until after the receiver is removed, these contacts are without eflect. Upon the descent of the hook, however, this is'ditierent, because ordinarily the lever F has been previously moved. contacts made with springs 30 and 31 during the intermediate part of the hook movement are used to send impulses forreleasing the switching mechanism at the central oliice. The escape mechanism is used to prevent these contacts from being made so quickly as to be inefleei ive. If the hook H were rigidly connected to the segment H, then a sudden or forced descent of thehook would be liable to break or damage the escapement. By making a yielding connection between the two the hook may be forced down suddenly without causing the segment Htto move any faster than the spring 11 will carry it against the resistance of the escapement.

It will he observed that electrical contacts are made by the movement of the receiverhook, but that they are made through an intermediary and not directly. It will also be observed that the speed of these contacts is independent of the speed of the hook. The

The

particular devices illustrated for this purpose are divided or yielding connections between the hook and the actual contact-makers. The results obtained are a definite speed of contact-making and immunity from breakage or damage by accident or careless handling of the hook.

The calling device here illustrated is particularly well adapted for use in exchanges which combine party-line systems with automatic exchanges. For the sake of simplicity in drawings and description, however, I have chosen to illustrate it as connected to the kind of exchange shown in my Patent No. 606,764, issued July 5, 1898. In doing this I have omitted in the cent-ral-oflice apparatus all parts and connections not necessary to an understanding of the general operation. The central-oflice apparatus consists of a switching mechanism or each line running out of the office and a battery and battery-strip common for all switching mechanism. The switching mechanism is of the kind shown in my said patent, and consists of a contactmaker P, that is moved into connection with any one of a series of contact-points, and

. hence through suitable connections to connection with any other switching mechanism.

, The ma net A'is used for advancing the contact-maker P, and the magnet B is used for releasing the mechanism, so that it may rehe sets his dial D at "2,

line from switch N o. 2,

turn to its normal position. One or more local stations may be on each line that extends from the central office. When there are two or more stations on a line, there will be additional apparatus at the central oflice, as shown in my previously-mentionedapplication; but as such additional apparatus is no part of the present application it is omitted.

Assuming that the subscriber at station N o. 11 on the line from switch N o. 1wishesto call the subscriber at station No. 22 on the he would proceedas follows: If there is more than one station on his line, he will remove his receiver and listen to see if the line is busy. If it is busy, he restores his receiver and waits. If it is not busy or if there is no other station on his line, presses the key or lever F, and as soon as the dial returns to normal position he gives two rings with his generator. When through talking, he hangs up his receiver. .The'setting of the dial and the number of rings is areading from the stationnumber in the s stem chosen for illustration. Any system t numbering may be used. When the dial is set at 2, it stays at that place until the key F is pressed. This gives D strikes lever'E and moves it to sto P E. Each time such a contact 15 ma e and permits cam 4 to rotate and make two contacts with spring 3 before arm impulse flows from the batteryX at central through ground to station No.11, 1 L 2 3 4 5 6 7 A 8 9 X. This moves the contact-maker P of switch N o. 1 to the second contact, which connects to switch No. 2. Operating generator sends a ringing current as follows: G at station No.11, 1011 1213 141516 P17 18, to switch No.2,19 16 151413 1211 Q 20 2111 6 7A 8 9,to switch No.1,8A7 6 5 G. This ringing-circuit also goes through the other stations on the same line with station No. 22; but as two rings is assumed as the signal for that station other subscribers do not respond. Beginning at station N o. 11, the talking-circuit is as follows: R K 22 11 12131415 161 171819 1615141312 11 22 K23R242526272821H67A89,t0 switch No. 1, 8 A 7 6 H 21 28 27 26 25 R. When the receiver-hook at the calling-station descends, the mass 21 closes connection between springs 30 and 31, when a-current 'flows X through ground to station No. 11,

1 L 2 29 30 21 H 6 7 A 8 9 X. This closes spring. 33 to spring 34 while 31 is in contact with 21, when a branch of the above current flows from 21 31 32 11 12 33 34 B 35 9 X. This releases the switching mechanism and permits it to return to its normal position. it will be observed that this circuit for release passes through L and that this circuit in making a call. It thus happens that although the release is accomplished by the descent of the hook such descent is not eflective to produce release unless a call has been made. This isto avoid confusion and trouble when there are several stations on one line. Forv example, if when the subscriber takes off his receiver he finds the linebusy it would not do for him to release the switching mechanism by han ing up his receiver, because such action wou (1 cut .out the talking parties. The key F when operated serves as a means for making a call and when not operated serves as a means for permitting the subscriber to remove and replace his receiver -without interfering with a busy line.

What I claim is y 1. The combination with a receiver-hook arranged to be depressed by the weight ofa receiver, and a contact-making device ar ranged to be operated eachtime that the hook is depressed, of a spring-actuated member by which said contact-making device is operated, a governor mechanism by which the speed of said member is controlled, and a slipping connection between said member and said hook, said connection being so arranged that the hook may be depressed at a greater-speed than the movement of said member.

2. The combination with a receiver-hook,

and an arm movable with respect to each other, of a spring arranged to hold the hook and the arm normally at one extreme of their 95 is open unless the key F has been depressed movement with respect to each other, and a contact-making device operated by the movement of the arm when the hook is moving in a direction which would disturb the normal i relationship between the hook and the arm if the arm remained stationary.

3. The combination with a receiver-hook, an arm, and a slotted connection between the hook and the arm, said connection being arranged to permit a limited movement of the arm and hook with respect to each other, of a spring normally holding the two at one extreme of their movement with respect to each other, and a contact-making device operated by the force of said springwhen said hook is being depressed.

4. The combination with a contact-making device, and a source of power i'or operating it, of a receiver-hook, means by which an ascent of said hook ill set said device preliminary to the making of a contact thereby, and means by which a descent of said hook will release said device.

5. In a calling device arranged to control the operations of a s itching mechanism, an indicator adapted to be set tor a required advance of such switching mechanism, a contact-making device arranged to send impulses for causing such advance, a spring placed under tension by the setting oi said mdieator and arranged to operate said contact-making device, a key for setting said device into operation so as to send the re- ,quired impulses and to return the indicator to its normal position, a second contactmakmg device and a recelver-hook connected together, and means by which a descent of the hook ill cause the second device to send an impulse to the switching mechanism over a different course than that traversed by the impulses be ore mentioned.

6. The combination with two courses over which impulses may be sent, of a contactmaking device for sending and an indicator for determining the number of impulses to be sent over one of said courses, a second contact-making device and a receiver-hook For causing the second device to send an impulse over the second course, and an independent governor for each device for controlling the speed of its movement.

7. The combination with two courses over which impulses may be sent, ot a separate contact-maker for each course, an indicator arranged to be set by hand tor the sending of a desired number of impulses over one of said courses, a governor for controlling the speed with which such impulses are sent, a receiverhook arranged so that by its descent it ill cause an impulse to be sent over the second course. and means by which a forced descent of said hook is prevented from influencing the durat on of the Impulse over the second course.

8. The combination with a receiver-hook, and a contact device arranged to close one electrical connection when the hook is elevated, to close a second electrical connection when the hook-is depressed, and to temporarily close an interi'nediate electrical connection while passing from the elevated to the depressed position, of means by which a rapid dou nward movement oi the hook is prevented i'rom atlecting the rate of speed at which said electrical connections succeed each other.

9. A contaet closing device, a spring for operating it, a governor tor controlling the speed thereof, means-for stopping the contact-closing device when it has made the desired number of contacts, and a slipping connection between said contact-closing device and said governor whereby the im act due to stopping said closing device is re need.

10. In a calling device, an indicator adapted to he set for the making of any desired number oi contacts, a key for starting the making of such contacts into operation a circuit normally disconnected from the contactmaking parts, means by which the move ment of the key i'or starting the making oh circuit and a second contact-closing device for sending an impulse over the other circuit, means for setting the first contact-closing device into operation, a receiver-hook provided with connections for operating the second contact-closing device, and means by which the operation of the second contact-closing device ill not send an impulse over the second circuit until ater impulses have been sent over the first circuit by the first contact-closing device.

12. The com ination with a contact-closing device, a battery. and a normally open connection letween said battery and said contact-closing device, a receiver-hook arranged to operate said contact-closing device during its descending movement, and a key arranged to close the connection letween said battery and said contact-closing device, when said hook is in an elevated position.

13., The com ination with a contact-closing device, a battery, and a normally open connection between said battery and said contact-closing device, of a receiver-hook, a key arrangedto close the connection le tween the l attery and the contact-closing device, when said hook is in an elevated position, and means by which a descent of the vcontact-making device normally disconseparate contact-closing device for each circuit, independently-operative means for causing the contact-closlng devices to send impulses Over their respective circuits, and means by which the second contact-closing device is inoperative to send an impulse over the second circuit until after the first contact-closing device has been operated to send impulses over the first circuit. I

15. The combination with a battery, a

nected from said battery, and means for operating said contact-making device, of a telephone-calling device adapted to be operated for the selection of a desired telephone-station, and. means by which the operation of said calling device will connect said contactmaking device to said battery.

16. The combination with a circuit over which impulses may be sent, of a contactmaking device normally disconnected from said circuit, an indicator .arran ed to' be set for the making of any desire number of contacts bysaid device, a key for connecting said circuit to said device and for starting" said deviceiintoi operation, and a receiver? hook arranged to disconnect saiddevice from said circuit.

17. The combination with one .br'anch'of an electrical circuit, and two other branches normally disconnected from the first branch, of a key for connecting the first branch to. the

others so as to form two complete circuits, a contact-maker 1n one circult for sendmg 1mpulses thereover, an indicator for determining the number of impulses to be sent by said contact-maker, means by which a movement of said key to connect the first branch to the others will set said contact-maker into operation, a separate contact-maker in the second circuit, a receiver-hook arranged to operate the contact-maker in the second circuit, and

means by which upon the hook operating such ,contact-makerthe makin of a contact thereby will be followed by said hook breaking the connection between the first branch and the other two branches.

18. Thecombination with two normally incomplete circuits and a separate contactmaker for each, of an indicator; for determining the numb er of contacts to be made by one contact-maker, a receiver-hook for causing an operation of the second contactmaker, a key for closing said circuits elsewhere than at the points at which said contact-makers operate, means by whicha movement of said key to close said circuits will start the first contact-maker into 0 eration, and means by which a descent of sai hook to operate the second contact-maker will restore said key to its normal position and 7 break the connections made thereby.

Signed at Chicago, Illinois, this 7th day of June, 1904. 1

FRANK A. LUNDQUIST.

Witnesses:

C. L. REDFIELD, C. E. JORDAN.

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