US1251320A - Telegraph circuit-closing and signaling system. - Google Patents

Description

F. A. ANDERSGN.

TELEGRAPH CIRCUIT CLOSING AND SIGNALING SYSTEM.

' APPLICATION FILED MAR. 2, 1917.

1 51 32@o Patented Dec. 25, 1917.

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A TTORNE Y8 UNITE SA TELEGRAPH CIRCUIT-CLOSING AND SIGNALING SYSTEM.

Specification of Letters Patent.

Patented Dec. 25, 191?.

Applicationfiled March 2, 1917. Serial No. 151,991.

To all whom it may concern:

Be it known that I, FREDERICK A. ANDER- SON, a subject of the King of England, and a resident of Portage la Prairie, in the Province of Manitoba and Dominion of Canada, have invented a certain new and useful Tmprovement in Telegraph Circuit-Closing and Signaling Systems, of which the following is a specification.

My invention relates to improvements in telegraph circuit closing and signaling systerns, and it consists in the combinations, constructions, and arrangements herein described and claimed.

. An object of my invention is to provide a system by means of which a telegraph circuit at a local ofiice which is open, as for instance when the switch is left open, the relay wire broken, or from any other cause, may be closed from a central ofiice.

A further object of my invention is to provide a system of the type mentioned in which signals will be sent to the central oiiice indicating the particular local ofice at which the open circuit or break occurs.

A further object of my invention is to pro vide a system in which the break in the circuit at the local oifice is indicated by an audible signal at the local ofiice which is set in operation from the central or head ofice.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accom panying drawings, forming part of this application, in which:

Figure 1 is a diagrammatic view showing the circuit connection at the local station;

Fig. 2 is a perspective view of a portion of the apparatus at the local station;

Fig. 3 is a side View of the apparatus shown in Fig. 2, and

Fig. 4 is a section along the line 44 of .Fig.

In carrying out my invention I provide each local station with the following apparatus: A magnet 1 has an armature 2 on the end of a. lever 3 which is pivoted at 4 to a post or support 5. This lever is bent, as shown in Figs. 1 and 3, and one end of it is arranged to engage a stop 6 carried by a armature 2 in close wheel 7. The lever 3 is provided with a bent end 3 which extends in the path of the stop member 6.

Mounted on a shaft 8 is a disk 9 whose outer edge is made in the form of a spiral, so as to provide a shoulder 9". The disk is provided with a series of oppositely proecting pins 10, these pins indicating the number of the station. In the present instance three pins are shown. There is a longer pin 11 also provided on the disk.

A spiral spring 12 surrounds the shaft 8, being attached thereto at one end, the other end being attached to the frame of the device,'as shown in Fig. 3. A gear wheel13 on the shaft 8 transmits motion to the shaft 7*, by any suitable gearing not shown.

Pivotally mounted at 14 is a bell crank lever having a contact 15 at one end arranged to engage a contact 16. The other arm of the bell crank lever is provided with a pivoted arm 17 which is normally pressed on by a spring 18 to hold the arm 17 in the position shown in the drawings. A bell crank lever 19 is pivoted at 20, one end bearing a contact 21 arranged to engage a contact 22, and the other end restingagainst the end of a set screw 23, see Fig. 3.

An audible signal 24, such as a buzzer or a bell, is in a local circuit with a battery B, which local circuit is arranged to be closed by the engagement of the contacts 21 and 22 in the manner hereinafter described. The main telegraph line is shown at L and L.

At S I have shown a switch, which is adapted to throw into circuit the relay R of the local set, of which the key K forms a part.

In shunt around this local telegraph circuit is a wire 26 which connects with a wire 27 leading to the contact 16. A wire 28 connects the contact 15 with the line wire L. The magnet 1 is bridged across the shunt circuit between the wires 27' and 28 in series with a condenser Q.

A lever 30 is pivoted at 31, and has an arm 32 extending upwardly, the bent end 33 of the arm resting on the periphery of the disk 9. The lever 30 is provided at its end with a hook 34 which is arranged to engage the lever 3 at 35 so as to raise the latter, as will be hereinafter explained, and to hold the the magnet 1.

proximity to the core of other the circuit is left open.

From the foregoing description of the various parts of the device, the operation thereof will be readily understood.

Let us assume that from some cause or The attend ant at the central or head office puts an alternating current generator G on the line, as for instance, the line L in Fig. 1. This alternating current will not afi'ect the relay R because the circuit is broken, but it will pass the condenser and will actuate the magnet 1. The armature 2 is attracted and being attached to the lever 3, the latter is moved so that the end 3 is withdrawn out of the path of the stop member 6 on the wheel 7 thereby permitting the wheel 7 to revolve. After the wheel 7 has made a few revolutions, the bent end 33 of the arm 32 has moved away from the shoulder 9*, due to the revolution of the disk 9 in a clockwise direction. This draws the arm 32 upward, and hence raises the lever 30 which engages the lever 3 and holds the armature 2 down on the core of the magnet 1, thereby permitting the wheel 7 to continue its revolutions, without the aid of the alternating current to hold the armature 2 down any longer than necessary to set in' motion the holding lever 30.

As the disk 9 revolves, the pins 10 come into engagement with the arm 17 on the bell crank lever. The contact 15 which is carried on the opposite end of the 'bell crank lever is moved into enga ement with the contact 16 and after the pin has passed the lever falls back into its original position. This causes a closing of the circuit of the main line each time one of these pins passes. the present instance there are three of the pins 10, and thus three impulses are transmitted to the central 'ofiice, thus indicating the particular station on the line at which the break or open circuit has occurred.

' On the further movement of the wheel 9, the long pin or arm 11' engages the bell crank lever 19, 'which the short pins 10 have not engaged. It moves this bell crank lever so as to close the contacts 21 and 22, and it also moves the lever so as to cause the movement of the other bell crank lever, thereby closing the contacts 15 and 16. This also causes'the stopping of the wheel 9.'

The contacts 15 and 16 being closed, the main line is now again in operative position so that if the operator at the local office should be absent, communication would again be established on the main line regardless of his absence.

The closing of the contacts 21 and 22 throws the audible signal 24 on the local line and gives indication to the local operator that something is wrong.

When the operator has determined the cause of the break he turns the wheel backwardly until the shoulder 9 engages the bent portion 33 of the arm 32. For the purpose of perfecting this return movement easily, ll provide the hand wheel 35 on the shaft 8. Resetting of the wheel 9 rewinds the spring to which this wheel is attached. The parts will then assume their normal position shown in Fig. 1.

It will thus be seen that T have provided a device which not only notifies the main oflice of the particular station at which a break in circuit occurs, but also closes the line and gives an audible signal to the local operator, notifying him that something is wrong.

While I have described a particular form of mechanism for accomplishing the result named, at the same time it is obvious that other forms might be substituted without departing in the least from the spirit and scope of the invention.

T claim:

1. In a telegraph system having a main office and local stations each provided with a telegraph set, the combination of means at each local station actuated from the main ofrice for closing the main line and for sending the signal to the main oifice for identifying the local station.

2. In a telegraph system having a main ofiice and local stations each provided with a telegraph set, the combination of means at each local station actuated from the main ofiice for closing the main line and for sending the signal to the main oflice for identifying' the local station, and means actuated by the first named means for sounding an audible signal at the local station.

3. in a telegraph system having a main ofice and local stations each provided with a telegraph set, the combination of a shunt circuit around said telegraph set, said shunt circuit being normally open, and means operated from the main oflice for closing the shunt circuit a predetermined number of times, said number being different for each different station and for subsequently leaving the shunt circuit, in closed position.

4. In a telegraphsystem having a main ofice and local stations each provided with a telegraph set, the combination of a shunt circuit around said telegraph set, said shunt circuit being normally open, means operated from the main ofiice for closing the shunt circuit a predetermined number of times, said number being different for each different station and for subsequently leaving the shunt circuit in closed position, said means comprising a spring actuated wheel provided with a series of pins corresponding to the number of the stations, and a movable contact arranged to be actuated by the successive engagements of the pins, and mplanls for starting the movement of the w ee 5. In a telegraph system having a main 17 0 taeisao office and local stations each provided with a telegraph set, the combination of a shunt circuit around said telegraph set, said shunt circuit being normally open, means operated from the main office for closing the shunt circuit a predetermined number of times, said number being dili'erent for each different station and for subsequently leaving the shunt circuit in closed position, said means comprising a spring actuated Wheel provided with a series of pins corresponding to the number of the stations, and a movable contact arranged to be actuated by the successive engagements of the pins, a stop lever for normally preventing the movement of said Wheel, and a magnet for actuating said stop lever to permit the movement of the Wheel.

6. In a telegraph system having a main oflice and local stations each provided With a telegraph set, the combination of a shunt circuit around said telegraph set, said shunt circuit being normally open, means operated from the main ofiice for closing the shunt circuit a predetermined number of times, said number being diflerent for each different station and for subsequently leaving the shunt circuit in closed position, said means comprising a spring actuated Wheel pro vided With a series of pins corresponding to the number of the stations, and a movable contact arranged to be actuated by the successive engagements of the pins, a stop lever for normally preventing the movement of said Wheel, and a magnet for actuating said stop lever to permit the movement of the Wheel, said magnet being in series With a condenser and being bridged across said shunt circuit.

FREDERICK ALEXANDER ANDERSON.

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