US309571A - Means for overcoming static disturbances in telegraphy - Google Patents

Description

(No Model.)

Q. SELDEN.

MEANS FOR OVERGOMING STATIC DISTURBANGES IN TELEGRAPHY.

No. 309,571. Patented Dec. 23, 1 884.

WITNESSES 5 uvvnvroz; v m ghyw J I By his Afforney v I To all whom it may concern Warren rams CHARLES SELDEN, OF

MEANS FOR OVERCOMING STATIC SPECIFICATION forming part of Letters P Application filed Novem sr. Louis, MISSOURI.

DISTURBANCES lN TELEGRAPHY.

atent No. 809,571, dated December 23, 1884.

her 11, 1862. (No model.)

Be it known that I, CHAS. SELDEN, a citizen of the United States, and a resident of St. Louis, in the county of St. Louis and State of Missouri, have invented certain new and use ful Improvements in Telegraphs, of which the following is a specification.

The object of my invention is to prevent the occurrence of false signals in telegraph apparatus from the discharge or return current which flows through the relay when the battery is withdrawn from line and the line put to earth.

My invention consists in the combination, with the relay-armature, of an auxiliary electro-magnet arranged to exert a pull upon the same in opposition to the relay-coils when affected by the discharge or return current, in combination with suitable means for including the coils of said magnet on a local circuit with a battery at the instant of the static discharge, so that simultaneously with the flow of the discharge-current the current of the local battery shall flow in closed circuit through the coils of the auxiliary electro-magnet.

In setting forth the principles of my invention I have shown the same as applied to the differential relay of a duplex or multiplex telegraph; but I do not by any means limit myself to such application. I have also shown and described one kind of device that may be employed for bringing the auxiliary magnet into action; but I do not limit myself to the particular device described, the essence of my invention consisting in overcoming the effect of the return or discharge current by an an);- iliary magnet arranged to pull in mechanical opposition to the relay, and brought into action at the proper time by any suitable automatic device acting synchronously with the movements of the transmitter to close the circuit of the local battery through it.

In the accompanying drawings, Figure 1 is a diagram of the apparatus at one station of a duplex telegraph, showing one method of carrying my invention into practice. Figs. 2, 3, 4: show the auxiliary circuit-closinglever of Fig. l in detail. Fig. 5 shows a device that may be used for modifying or adjusting the duration of the opposing effects of the auxilidevice shown in Fig. 5. Figs. 7 and 8 show a second method of closing the circuit of the auxiliary electro-magnet.

It indicates an ordinary differential relay, one of whose coils is in the main-line circuit, while the other or equating coil is in a circuit to earth containing the adjustable resistancerheo.

A indicates the transmitter-lever, which is operated by eleetro-magnet F, controlled by a key, G, and local battery H.

At T are shown the adjustable stops for the leverA. At the opposite end of the lever is the insulated contact-spring 0, arranged to come into contact with adjustable point a, so as to put the main line battery M B to line through said point a and spring 0 when the transmitter is operated. Normally the spring rests in contact with the hook on the end of lever A, which latter, being connected with earth, serves to complete the circuit between line and earth when the battery is taken off.

These devices being well known in the art, their operation need not be described in detail.

S is the reading-sounder in a local circuit, controlled in the ordinary way by the armature-lever of the relay. Said armature-lever is indicated at E, and is provided with two armatures, one of which is acted upon by the core of relay R, while the other is the armature for the auxiliary magnet D, which serves, when energized, to counteract the pull of the relay-magnet when the discharge or return current circulates in the latter, and is for that purpose energized through the intervention of devices to be presently described. The core of magnet D is by preference adj ustable to and from the armature-lever for the purpose of modifying the strength of its pull to correspond with the strength of the discharge or return current from the line circulating in the coils of the relay.

K is a local battery in circuit with magnet D and controlled by a lever, B, a contactspring, m, upon which serves to complete the circuit of the local battery through a'contactstop, 0, when lever B is operated.

At T is shown the adjustable stop for said lever, while rheo indicates a rheostat for my magnet. Fig. 6 is a modification of the modifying the strength of the magnet when energized by the local battery. The lever B is an auxiliary lever to the transmitter-lever A, and is provided with a hinged or jointed portion, B, against which the stud or pin 1? on lever A impinges whenever the transmitter is operated, the construct-ion being such that the hinged portion will allow the stud to slip by without moving the lever B during upward movement of the transmitter A-th at is. when said transmitter acts to put the main battery to line but that during the return movement of the transmitter to its normal position the stud will operate said lever B and cause a momentary closing of the local circuit which charges the auxiliary magnet, this closure occurring at the time that the main battery is withdrawn from line 7 and the line is put to earth. The construction of this portion of the apparatus is shown more clearly in Figs. 2, 3, and 4. As here shown, the portion B is hinged or jointed at b and has a shoulder or step at d, which is normally held in engagement with B by a spring f. The portion B can be raised into the position shown in Fig. 3 without disturbing B; but when B is carried downward the lever B moves with it, and its opposite end is raised from its back stop and closes the local circuit of the battery which directly or indirectly serves to energize the auxiliary magnet.

Fig. 4 illustrates the relative position and action of the parts. The end of stud P moves in the arc of a circle, w, described from the fulcrum of the transmitter-lever A. The part B of the auxiliary lever, when moved upward by 1?, moves in the arc of a circle, y, described from its joint I) as a center, so that l in moving upward will escape it at a point, 3, where the arcs intersect, and B will immediately rcturn toits normal position. In this movement of the transmitter, by which movement the battery is put to line, no movement is imparted to the auxiliary lever B, and the auxiliary magnet D therefore remains unaffected. As the transmitter returns to its normal position, I engages with the upper side of B, carrying the latter, with lever B, downward, so as to cause the local circuit to be closed at the same time that the discharge-current flows in the relay. The armature-lever E is thus held in its proper position by the auxiliary magnet acting in opposition to the attraction of the relay-coils.

In the movement of the lever B in chargingv the auxiliary magnet the point of B moves in the are of a circle, and the end of 1 escapes by it at a point, 2, where arcs a: and z intersect, this point being above the point at which 1 comes to rest and resumes its normal position prior to another movement upward. The contact stops and springs are properly adjusted so that the local circuit of I) shall be closed at m c at the instant that the main-line battery is withdrawn and the line connected toearth at 0 n. The duration of the contact at m e, and the consequent duration of the opposing effect of the auxiliary magnet, maybe determined by suitable adjustment of 0, so that said opposing effect will continue during the period that the return-current exercises a disturbing effect; or said adjustment may also be partially effected by moving the ad justable point P out or in, so as to vary the time during which it shall hold the spring m in contact with c.

The device shown in Figs. 2, 3, and 4 forms the subject of another application for patent filed by me, and I therefore do not make any claim to it herein.

Other devices might be used in place of the particular devices shown for momentarily causing the charge of the auxiliary opposing magnet by closing the circuit of the local battery through it at the same time that the discharge or return current flows in the relaycoils, and I do not, therefore, limit myself in this respect.

A device that may be used in place of the auxiliary lever described for closing the circuit of the auxiliary magnet is shown in Figs. 7 and 8. It consists of a circuit-closing spring. 6, attached to the transmitter-lever A, or to any device operated thereby, and an inclined piece, 5, of some insulating material, upon the face of which is a conductingpiece with which the spring makes contact on its return movement only. On the upwardmovement of the lever the toe on the end of the spring rides along the back of the inclined piece 5, and escapes by its top edge, assuming then a position in substantially the same vertical line with its original or lowest position, so that on the return movement it slides 011 the face having the contact-plate, and, slipping by thelower edge of the piece 5, resumes its original position, shown in the drawings, ready for the next up and down movement. The spring 6 and the plate form the terminals of the polarizing-circuit. The piece 5 may be made adj nstable by any suitable mechanical device, so as to determine the instant at which the circuit shall be closed. The'adj Listing-screw indicated in Fi 8 as employed for this purpose is omitted from Fig. 7 for the sake of simplicity.

A device that may be used for adjusting the period of the opposing influence of the auxiliary magnet to correspond with the period of the return or discharge current is shown in Fig. 5. It consists of a mass of soft iron, 12', adjustable to and from the core of D, so as to in effect vary the magnetic mass, and the consequent readiness with which the'core of I), having been momentarily charged, will lose its charge. The nearer the bar 12 to the core the slower is the discharge, and hence the time during which the opposing effects of D shall endure may be adjusted to correspond more or less closely with the time during which the return-current would, if unopposed, exert a disturbing effect. An equivalent method to that shown in Fig. 5 consists in bridging, to a greater or less extent, the

poles of the magnet I). Such method is shown in Fig. 6, in which 13 indicates a bar of iron adjustable to and from the poles of D, so as to complete, to a greater or less extent, the magnetic circuit.

My invention is designed, chiefly,t'or use with the receiving-relays of duplex or multiplex telegraphs, but may be used in other connections, as is obvious.

The auxiliary circuit-closing lever of Figs. 1, 2, 3, and 4 forms the subject of claims in an application for patent filed by me November 11, 1882, No. 76,568, and no claim is therefore made to it herein per s0.

\Vhat I claim as my invention is- 1. Thecombination,with the armature-lever of a rcceiving relay, of an auxiliary magnet arranged to exert a pull on said armature lever in opposition to the'coils of the relay when affected by the discharge or return current, and suitable means for closing the circuit ot a local battery through said auxiliary magnet simultaneously with the flow of the discharge or return current through the coils of the relay.

2. The combination, with a relayarmature, of an auxiliary electro-magnet arranged to exert a pull upon said armature in opposition to the pull of the relay-magnet when aii'ected by the discharge or return current, a local circuit and battery for said magnet, and means for closing said circuit through the auxiliary electro-magnet on the back movement of the transmitter only, said circuit being unaffected on the forward movement thereof.

0. The combination, with an auxiliary electro-magnet, D,of a supplemental circuit-closer controlling the circuit thereof, a transmitterlever, and a spring-joint connection, 13, interposed between the transmitter and the supplemental circuit-closer, so as to allow said transmitter to put the main battery to line without affecting the circuit-closer, but to cause the transmitter to operate the circuitcloser when said transmitter returns to its normal position.

4. The combination of the auxiliary magnet D in local circuit, circuit-closer B B, constructed asdcscribed, and transmitter-lever A, carrying the adjustable stud l.

Signed at New York, in the county of New York and State of New York, this 9th day of Xovember, A. l). 1882.

CHAR-LES SELDEN.

Witnesses:

THOS. TOOMEY, Gno. G. COFFIN.

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