US239579A - Telephone signaling apparatus - Google Patents

Description

7 (No Model.)

H. VAN HOEYENBBRGH. Telephone Signaling Apparatus, No. 239,579 Patented March 29,1881.

Ayta/tb'on A.

2 Sheet-Sheet. 2.

(No Model.)

H. VAN HO BVENBERGH. Telephone Signaling Apparatus;

No. 239,579. Patented March 29,188].

MPEYER; mYO-UTHDGRAPMER, WASHINGTON D C UNITED STATES PATENT @FFICEQ HENRY VAN HOEVENBERGH, OF ELIZABETH, NEW JERSEY.

TELEPHONE SIGNALING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 239,579, dated March 29, 1881.

Application filed November 29,1880. (No model.) v

' To all whom it may concern:

Be it known that I, HENRY VAN HOEVEN- BERGH, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Telephone Signaling Apparatus, of which the following is a specification.

My invention relates to the construction and arrangement of the apparatus which is em-' the signaling apparatus; second, in the combination of a main line, a signaling-key, a battery placed between the working-contact of said key and the earth, a receiving-telephone placed between the resting-contact of saidkey and the earth, a contact-point placed upon the diaphragm of said telephone and adapted to close a local circuit by means of the attraction exerted by the telephone-magnet under the influence of the signaling-current, and an electro -magnet for actuating the signaling mechanism which is included in said local circuit, whereby I am enabled to operate the signaling apparatus automatically from the telephone-magnet in the main circuit without the necessity of an additional magnet for the purpose, and also to dispense with the special switch heretofore employed for the purpose of connecting the main line to the signaling-instrument and to the telephone-instrument.

In the accompanying drawings, Figure 1 is a diagram representing the arrangement of apparatus and circuits at two terminal stations of a telephone-line embodying my invention. Fig. 2 represents the application of my invention to an apparatus in which a voltaic transmitter distinct from the receiver is employed.

I have shown in Fig.1 a telephone-line with two terminal stations, respectively designated as station A and station B. As the arrangement of the apparatus and circuits at each of the two stations is precisely the same, a description of one will be sufiicient to illustrate my invention.

In the drawings, L represents the line connecting the two stations, which, upon entering 6o .the coil R of a receiving-telephone of the usual construction, and thence, by way of the point 9, to the earth G. When the key K is depressed it disconnects the line L from the branch Wire 1, and forms a new connection between the line L and the branch wire 6, which is attached to one pole .of a battery, E, whose remaining pole is connected to the pointy, and consequently with the earth at G.

The receiving-telephone at station A is of the ordinary form, and consists oi a coil, R,

(hereinbefore men tioned,) which envelopes one of the poles of a permanently-magnetized rod, bar, or core, 1'. In close proximity to the working-pole of the bar 1 is mounted a thin metallic diaphragm, D, which is not normally in contact with the bar 1".. The diaphragni D is mounted within a cone or mouth-piece in a well-known manner.

The principal advantage intended to be secured by my invention is that of rendering the coil of the reciving-telephone available to actuate the signaling apparatus. The introduction into the main circuit of the coil of an additional magnet for this purpose is very objectionable in practice, inasmuch as the latter 0 tends to absorb the telephonic vibrations and thus render the communications indistinct. In order to obviate the necessity of employing an additional magnet, I place acontact-point, 61,

upon the under side of the diaphragm D of the 5 receiving-telephone, which is placed opposite to, but not normally in contact with, a similar point, which is preferably inserted in the end of themagnetic bar 1". These two contact-points,

when pressed together, complete a local circuit, I00

which is preferably derived from the signalin g-batteryE, as shown in the figure, although a separate battery may be used, if deemed preferable, under the circumstance of any particular case. An electro-magnet, S, for actuating a signal-bell, or any other well-known or suitable device serving the same purpose, is included in the said local circuit. Thus it will be understood that telephonic currents, as well as signaling-currents, arriving by the wire L from the distant station atB will pass, by the wire I, through thecoil R of the telephone-receiver directly to the earth at G. The former will merely throw the diaphragm D into the minute vibrations which suffice to produce audible and intelligible sounds in the usual and well-known manner, while, on the contrary, the signaling currents which proceed from the battery at the distant station are of much greater strength and cause the attractive force of the bar 1 to be so augmented as to'poWerfully attract the diaphragm D and to bring the contact-point d mounted thereupon into electrical connection with the bar 1, closing'the local circuit, which proceeds frombatteryE by way of wire 20, bar 1", diaphragm D, wire it,

and point g, and includes the electro-magnet' S of the signaling apparatus.

Thus it will be understood that the signalingis effected solely by the action of the coil B, so far'as'the main circuit is concerned. By the depression of the key K outgoing signals are sent directly to the line L from the battery E, through the wire e, without passing through any of the apparatus within the station, which apparatus is, in fact, wholly disconnected from the line during the operation.

In the arrangement shown in Fig. 1 the telephonic receiver is also adapted to be used as a transmitter. The arrangement commonly preferred in practice is that of an independent transmitter, which usually consists of an induction-coil and some some suitable device for varying the resistance of the primary circuit of said induction-coil, which is controlled by the vibrations of a diaphragm.

In Fig. 2 the wire I, after passing through the coil R of the receiving-telephone,traverses the primary coil *6 of the inductionapparatus and then goes to the earth at G, as before.

The variable resistance controlled by avibrating diaphragm is shown at T, and is connected by the spring 1) and wire h with one pole of the battery E, and by the wire 0, the primary coil I of the inductionapparatus, wire P, stop 0, switch 0, and wire h, to the other pole of the battery.

The switch 0 is represented as an automatic switch of well-known construction, which is operated by the weight of the receiving-telephone,which,when suspended from it, as shown ally, and which obviates the necessity of additional magnets on the main telephonic circuits.

I claim as my,invention 1. The combination, substantially as here inbefore set forth, with the magnet and dia phragm of a telephonic receiver, of a contactpoint" mounted upon said diaphragm, and adapted to close a local circuit whenever signaling-current of suflicient strength traverses the coil of said magnet.

2. The combination, substantially as hereinbefore'set forth, of a main line, a signalingkey, a battery placed between the workingcontact of said key and the earth, areceivingtelephone, placed between the resting-contact of said key and the earth, a contact-point upon the diaphragm of said telephone, adapted to close a local circuit through the attraction exerted by the telephone-magnet under the influence of a signaling-current, and an electromagnet for actuating a signaling mechanism included in saidlo'cal circuit. 1

In testimony whereof I have hereunto subscribed my name this 23d day'of November, A. D. 1880. i

HENRY VAN HOEVENBERGH.

" Witnesses:

' NELSON ZABRISKIE,

MILLER G. EARL.

Images