US232442A - Individual call-bell - Google Patents

Description

3 Sheets--Sheet 1. F. B L A K B.

Individual Gall Bells. No. 232,442. Patented Sept. 21,1880.

. Fl -1- Inventor a, 9 7 2 I/WW P. BLAKE. 3 sheets sfiet 2.

Individual OaJllBells, No. 232,442. Patented Sept. 21, I880.

filmy Mag. I flll ,Bell. L S 0 s N.PETERS, PHOTO-LITHGGRAPHER wnsummom D C.

PATENT FRANCIS BLAKE, OF WESTON, MASSACHUSETTS.

INDIVIDUAL CALL-BELL.

SPECIFICATION forming part of Letters Patent No. 232,442, dated September 21, 1880.

' Application filed February 24,1ss0.

To all whom it may concern:

Be it known that I, FRANCIS BLAKE, of Weston, Massachusetts, have invented a new and useful Improvement in Individual 'Uall- Bells, of which the following is a specification.

The invention consists in the employment of a number of synchronously-revolving dials under the control of a battery-current upon a single circuit, but acting automatically, each at a separate time, to ring a magneto-bell by diverting through or grounding through the magneto-bell a magneto-current generated at the central office, in combination with adevice, under the control of the operator at the central office, by which the automatic operation of the dial at the central office may be made to coincide with the automatic operation of the dial at either of the out stations.

It also consists in a deviceforshowing when the line is in use.

' It consists, further, in certain details of construction.

In the drawings, Figure 1 is a plan, and Fig. 2 a frontelevation, of an instrument employed in carrying out my invention. Fig. 3 is a diagram, showing the circuit and branches when the invention is applied to a group consisting of a central stationand two out stations, the m agneto-bell to be run gbydiverting a magnetocurrent through it. Fig. 4 is a diagram in further explanation of the working of the invention. Fig. 5 is a diagram in explanation of the working of the circuit when the magneto-bells of the out stations are to be rung by grounding through them the magneto-current gener ated at the central station. I

There is but a slight difference in the construction of the instruments between those adapted to circuits in which the magneto-bell is to be rung by diverting a magneto-current and those belonging to circuits in which the magnetocurrent is to be grounded.

The instrument will first be described as be longing to a circuit of the former kind.

A is a wooden table. B isa brass frame for a train of wheels or ordinary clock-work, O, operated by a coiled spring, a. D is a dial up on a shaft, 0, revolving by the clock-work. F is a governing-fan. E is an electro-magnet mounted upon a block, 6. H isits armature, rigidly secured to a weighted bell-crank lever,

l, which, in turn, is rigidly secured to a post,

p, rocking on a pin, f, inserted in an arm, g,

projecting from the brass frame B. The bellcranklever carries a catch, m, which takes into a notch, n, in the periphery of the dial D,

and also a weight, 0, sufficiently heavy to lift the armature when not attracted by the electro-magnet. The dial D has a second notch,

n, for a purpose to be hereinafter mentioned. When the instruments are used in circuits in which the magneto-currentis to be diverted through the bell the dial is of metal and has a slot, which is filled with a hard-rubber plug,

1". When the instrument is to be used in circuits in which the magneto-current is to be grounded, the dial D is of hard rubber and the plugris of metal.

Pisa brass post in front of the dial, for

nishing a bearing for a metallic shaft, 13, carrying a hand or pointer, o. This hand is an electrode, and is furnished with a platinum point, which is at all times in contact with the dial, the plug 7 coming in contact with it at each revolution of the dial. The shaftt has a milled head, by which it may be turned, and itis lockedin any required position by a thumbscrew, it.

In the diagram, Fig. 3, B represents the brass frame with its train of wheels; D, the brass dial; P, the post in front of the dial; t, its shaft; o, the hand; and E the electro-magnet, all as in the instrument above described. B, D, P, t, o, and E represent like parts of a similar instrument at station N o. l, and B D P t t and E like parts of a similar instrument at station No. 2. The dials should be graduated according to the number of stations, and each station have its own number, its hand being turned to point to that number and there locked. That the hands may not get misplaced the milled heads may be removed from the shafts to which the hands are attached at the out stations.

Each station, including the central station, is provided with a magneto-bell, including a magneto-electric machine on the main line; and the central station is furnished with a battery, as indicated, and a key, the spring-arm of which, in its normal condition, is in contact with plate 13, but which, when depressed, is in contact with plate 14.

Each station is provided with four-screwcups, which, for convenience, are numbered in one series from 1 to 12. At the central station cups 1 and 2 are connected with the battery by wires w and 10 and cups 3 and 4 connect with a magneto-bell by wires 10 and w. Wires leading from cups 2 and 3, from plate 13, and from onespool of the electro-magnet E, unite, as shown at x, and are marked 20 w, and w The other spool of the electro-magnet E is connected by wire w with post P, while wire connects the brass frame, including its clock-Work O, with cup 4. A line-wire, w, connects cups at and 6, thus uniting the central station with station No. 1. At station No. 1 wires to and to connect cups 5 and 6 with a break-circuit key, 3, belong ing to the station, to be used in giving a return signal, as will be hereinafter described.

I Wires w and 10" connect cups 7 and S with a magneto-bell, and wire to connects the two cups 6 and 7. Wire 20 connects cup 5 with a spool of an electromagnet, E, the other spool being connected by wires 20 with post P, while wire to connects brass frame B with cup 8.

A line-wire, c0 connects stations No. 1 and No. 2 or cups 8 and 9. At station No. 2 wires @0 and it connect cups 9 and 10 with the magneto-bell. Wires w to connect cups 11 and 12 with the break-circuit key 8 20 connects cup 12 with one spool of electromagnet E Wire w connects the other spool with post P and wire to connects brass frame B with cup 9. Wire 10 conuectscups 10 and 11, the latter cup being grounded, as is likewise the spring-arm of the key at the central station.

In the diagram, 20 represents the ground part of the circuit, and wire @0 connects the key with cup 1.

It is evident from the above description that at each station, including the central station, the circuit is divided, one portion passing merely through the magneto-bell, while the other passes through the electro-magnet and the dial-instrument.

It should be added that the battery-current is to be used simply for operating the dial mechanism, the bells being rung by a magnetocurrent, and that the resistances of the different branches of the circuit at each station are such that the bell will not ring while'the current is divided at that station.

The battery-current is used as follows: In the normal condition of the line it is off, the arm of the key being in contact with the plate 13. at the central station the hand 4) is on the plug 4", for a reason to be hereinafter stated; but when the operator at the central station is about to put on the battery he turns his hand 1;, so that it is no longer in contact with the plug 'r, but is in contact with the dial, at'the graduation thereof which corresponds with the position of the hand at the out station he wishes to call. Then depressing the key and Wire 7 In the normal condition of the instrument bringing in the battery, the circuit is from the ground-key through line @0 to cup 1, through the battery by wires to and 10 to cup 2, to junction 00, where it divides, aportion passing by wire to through the electro-magnet, and by wire 10 post P, shaft t, hand 1), dial D, brass frameB, and wire 20 to cup 4, whenceit passes through the other stations to ground, as will be hereinafter shown. The other portion of the current passes from junction 00 by wire 20 to cup 3, and by wires 10 and to, through the magneto-bell, to cup 4, on to the other stations and ground. From cup 4 the battery-current is by line-wire w to cup 6 in station No. 1, where it again divides, a portion passing through wire 20 to cup 7, whence, passing through the magneto-bell by wires w and w, it passes to cup 8, on to the next station and ground, the other portion passing from cup 6 by wires w to, through the break-circuit keys, to cup 5, and then through the dial-instrument, by w" E 10 I t o D B @0 to cup 8, on to the next station and to ground. .Entering the next station at cup 9 the current divides, a portion passing through the magneto-bell and on to grounded cup 11 by 10 ,11), 10, and w, and a portion passing through the dial-instrument and break-circuit key to grounded cup 11 by w B D 712 t P 2.0 E @0 12 w s w.

When a single impulse of the batterycurrent is sent through the line the electro-magnet at each station attracts its armature, and thereby momentarily lifts the stop from the notch 02 in the dial and allows the dial to be revolved by the clock-work, and the dial will 'j continue to revolve until the stop resting upon the periphery of the dial falls in to the notch '11,.

The magneto'bells are of ordinary construction; but the invention may be more easily unoperate the bell-striker at each station are stated. They are as follows:

At the central station wires 3 and 4 may be considered as a single-line wire, in which are located the coil of the electro-magnet of the striker and a coil of the magneto-generator in such manner that these coils form a part of the line. In like manner wires 14 and 15 may be considered as a single-line wire at station 1, and wires 22 and 21 a sin gle-line wire at station 2, each having located in it, in like manner, corresponding coils. The circuits for the magnetocurrents remain the same as the battery-circuits, and itfollows'that a m agneto-current generated at the central station may be divided at cup 4, a portion being short-circuited through the dial-instrument, or it may all pass over linewire 10 to station 1. In like manner a magnetocurrent, of whatever strength,which has passed over wire 11 to station 1, may be divided at cup partly shortcircuited or wholly passed through the magneto apparatus to ground; but, as before statedin substan ce,the resistances are such that the bell at no station can be rung unless the full magneto-current, wherever generated, passes through the magneto apparatus of that station. It follows that if the magneto-current generated at the central station be divided at that station it will not ring its own bell, and it is obvious that if a magneto-current generated at the central station cannot ring itsown bell it will not have suflicient strength to ring the bell of another station, whether the short circuit at that other station be established or broken. In other words, the short circuits, through the dial-instruments of both the'central station and of an out station must both be broken in order to ring the bell atthe out station by a magneto-current generated at the central station. Now, the dials are all graduated, as before stated,and each station has its number. The normal position of the hand at each.

station is upon the figure ot' the dial designating the number'of the station,and at each revolution ot' the dialof any station, when the hand 4) comes in contact with the plug r, the short circuit through the dial is broken. It

. follows that the operator at the central station,

knowing the position of the hands at the other stations, can set his own hand to coincide with any one of the other bands, and that, genen atin g a magneto-current by his magneto-generator, he can send that current through his own magneto-bell and through the magnetobell of that station whose hand so coincides with the hand at the central station. Those two bells will ring, and those only, for at all other stations the magneto-current will be short-circnited. Accordingly, to call an out station, the operator at the central station will set the hand of his dial to correspond with the hand of dial of the station he wishes to call, send a single impulse of the battery-current through the line, and then generate a magnetocurrent. The single impulse of the batterycurrent will set all the dials in motion, and the bells of the central station and the called station will ring at the same instant, which will be when the plugs of the dials of the two instruments come under their respective hands.

It is obvious that the operator at any out station may call the central station by generatin g a magneto-current with the generator of his magneto-bell, provided he can break the short circuit through his dial-instrument; but

since his dial is under the control of the bat-.

tery-current, which is operated from the central oftice, it becomes necessary to furnish the short circuit at each out station with acircuitbreaker, as shown at 8, s and, Fig. 4, s.

A simple illustration of the invention as operated in a telephone-circuit consisting of a central and three out stations is shown at Fig. 4, in which the full line represents the main circuit passing through the magneto-bells, as above described,'and also through the telecurrent with his magneto-generator. The nor- 7 5 mal position of the hand at central station is shown in dotted lines at Fig. 4--that is, it is upon the plug and the short circuit is broken. If the operator at station 1 wishes to call the central station hehas merely to break his own short circuit and operate his magneto-generator. The switch S at the central station is unnecessary, but is provided in order that the central station may be called, even if, through mistake or otherwise, the hand is not upon the 8 5 plug.

In Fig. 5, as before stated, the invention is illustrated'as used when the magnetocurrent is grounded through the magncto-bells. The dials are then of hard rubber and the metal, and there can be no current of either description through the bell of any station unless the hand at that station is on the plug of the dial and as the hand at no station in its normal position is on the plug, the battery-current passes through the electro-magnets E of the dial-instruments, and a single impulsewill set the dials in motion, as heretofore described. When the circuits are arranged as shown in Fig. 5, there is no connection between plate 13 and the line, and in the normal condition of the line the current is broken at the key. The devices shown at 8, s and 8 instead of being circuit-breakers, are circuit-maker.s.

In'this system as worked with grounded bells a resistancecoil is placed in the main line beyond the farther station, of such power that a magneto-current generated upon the line will pass through an intervening magneto-bell to ground whenever an opportunity ofiers, and this happens whenever the hand at a station is on the plug.

The operation is as follows: The operator at the central station, wishing to call another station, sets the hand at his station so that it points in the same direction as the hand at the station he wishes to call. Touching the key, he then sends a single impulse through the line, setting all the dials in motion, when he generates amagncto-current in his magnetomachine;

It is obvious that this magneto-current can be established on the main line only when the plug comes under the hand at the central station, and it is also obvious that it will ground through the bell at that station the plug of whose dial comes under the hand at the same time. When grounded bells are used the hand is upon the plug at the central station, or the switch S is closed, so that the bell may be rung by any person generating a magneto-current at any out station.

plug of 4 v :eeama The notch it prevents the dial from making a full revolution, and when the catch on is in the notch n it is evident that the plug 4" will be in a different position from that which it occupies when the catch is in the notch 42. Use is therefore made of this device as a line-inuse signal. The operator at the central station allowing all the catches to remain in the notches a while the line is in use, the person at the out station seeing that his own plug is out of its normal place, will know that the line is in use.

It is obvious that in this system either station may be used as a central station, provided it has a suitable battery and key-that is, the bell of any single station may be rung from any other station.

I claim- 1. A number of synchronously revolving dials controlled by a battery-current but acting automatically, each at its own time, to ring a m agneto-bell by diverting through or grounding through the magneto-bell a magneto-current generated at a distant office, in combination with an automatic device under control of 25 the operator at the distant office, by which the automatic operation of the dial at the distant oftiee may be made to coincide with the automatic operation of either of the other dials.

2. In combination with a battery, suitable wires, and a magneto-bell, the hand 4), electro magnet E, armature H, provided with a catch, m, and dial D, provided with notch n and plug r, the dial or plug forming one electrode and the hand a second electrode, substantially as described, for the purpose specified.

3. At each of a number of stations on a telephone or telegraph line, a dial revolved by its own clock-work and provided with two notches or stopslocated relatively to each other and working in combination with the weighted armature of an electro-magnet, substantially as described, to show at any and all the stations whether or not the line is in use.

FRANCIS BLAKE.

Witnesses SAM. W. Barns, H. G. OLMSTED.

Images