US229068A - Multiple-telegraph relay - Google Patents

Description

J. 0. WILSON. Multiple-Telegraph Relay.

No. 229,068. Patented June 22,1880.

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JOHN G. VILSON, OF BOSTON, MASSACHUSETTS.

MULTIPLE-TELEGRAPH RELAY.

SPECIFICATION forming part of Letters Patent No. 229,068, dated June 22, 1880.

Application filed January 19, 1880.

To all whom it may concern Be it known that I, J OHN- OOENELIUs WIL- SON, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Relays for Multiple Transmission Telegraphs, of which the following description, in connection with the accompanying drawings, is a specification.

My invention relates to a relay for duplex or multiplex telegraphy, and is shown in connection with other rcceiving-instrun'ients of the duplex telegraph invented by Dr. J. B. Stark for sending simultaneous messages in the same direction by the use of two batteries of different strength. In that system two relays are used at the receivingstation, one, which maybe called the weak relay, adjusted to respond under the influence of the weak, and the other, which may be called the strong relay, under that of the strong, battery, the latter or strong relay at the same time applying a current from alocal battery through a second coil on the first mentioned or weak relay in such manner as to neutralize the elfect of the strong battery thereon, thereby leaving the said weak relay in condition to respond to its own or weak battery whatever be the condition of the other relay and battery. The said local neutralizing-battery is applied to act on the weak relay by the strong relay, which completes its circuit through the front stop and armature of said strong relay, and consequently the strong battery is acting unbalanced upon the weak relay during the time that said strong-relay armature is moving from its back to its front stop, which is a serious objection, rendering the system practically unavailable for telegraphic purposes.

To overcome this objection is the object of my present invention, which consists in pro vidin g suitable contact-points and connections, in combination with the armature-lever and front and back stops of the strong relay, whereby the local neutralizing-battery is applied to the weak relay the instant the strong-relay armature leaves its back stop, and remains so applied until the instant the said armature leaves the front stop.

Figure 1 shows a receiving-relay, to be affected by the stronger battery, embodying my invention, the local battery and connections with the weak relay being also shown Fig. 2, a top view of the relay-instrument alone, and Fig. 3 a modification to be referred to.

The main line 2 from the transmitting-sta tion passes through the coils of the strongrelay electro-magnet a and those I) of the weakrelay electro-magnet. A second coil, 0, will be used in connection with that of the weak relay, the said coils in practice being wound on the same core with the one bof the electromagnet, but shown separately for clearness.

The local battery (I is so connected in circuit with the coil 0 and adjusted by resistance or otherwise that the eliect of its current in the coil 0 will just balance that of the strong battery from the distant station in the coil 1), to thus leave its armature unattracted by the two currents together.

The features described up to this point are old and form no part of my invention.

The armature c of the strong-relay magnet, pivoted atf and provided with the usual retracting-spring, carries on one side a contactpoint, 1, insulated therefrom, the said armature c and contact-point g being adapted to contact with two points, h 1 respectively, of a movable contact piece, j. (Shown as U- shaped, and pivoted at Z.) This U-shaped contact-piece moves with a slight friction at l, or is otherwise adapted to remain against either of the stops in a which it may be in contact with until positively moved by the armature e away from it and into contact with the other stop, the ends th of said contactpieces being interposed between the ends of the armature e and front and back relaystops, a m, respectively.

One pole of the battery, cl, is connected with the contact-piece j by wire 3, and the other pole by wire 4:, coil 0, and wires 5 6, with the back relay-stop m, and also by branch 7 with the insulated point g on the armature c. A wire, 8, to shunt the coil 0, is connected to the armature c and wire at between the battery and coil 0.

As shown in the drawings, the armature is passing from the back to the front stops.

Vhile resting on the back stop the coil 0 is shunted, the circuit of d then being through wires 4 8, armature 6, U-shaped piece, and wire 3.

The moment the armature leaves its back stop h m the shunt-circuit is broken at 0 IL, and the circuit of d. is now through wire 4, the coil 0, wires 6, points at h, and wire 3, thereby immediately bringing the coil 0 into action.

When in the forward movement of the armature the point 9 meets the end i of the U- shaped piecej the circuit of battery dis through wire 7 and points 9 t", the wire 6 and the point at being removed from the circuitlast described. The circuit remains in this condition as long as the armature c is attracted; but the moment it recedes from the front stop the said circuit is broken at g i, and when the armature e, in its backward movement, reaches the end 71 of the U-shaped piece the circuit is shunted through the wire 8, as before described.

It is obvious that a relay constructed in this manner might be used to operate the usual recording-instrument which would take the place ot the coil 0, or that the said recordinginstruments might be inserted in the wire 5 in connection with the instruments shown.

The recording instruments and sonnders may, however, be operated by a separate battery, the circuit otwhieh may be closed through either of the relay-stops m a and the U-shaped piece, or through the back stop at and armature, the two being electrically connected through the end h of the U-shaped piece, which co-operates with the stops at a to form what may be called compound stops for the armature c.

It is obvious that other forms may be given to the U-shaped piece, and that various means may be used to cause it to remain in contact with either stop until positively moved away by the armature-as, for example, it may be pivoted as an inverted pendulum, and so rest against either stop by its own weight, or a small magnet may be placed at each side, the U-shaped piece being of iron.

The movable contact-piece may be a second lever pivoted at or near f, with its upper end curved over the end of the armature e, as in Fig. 3.

1. In a multiple telegraphic apparatus, a relay adjusted to respond to the current of a distant weal; battery, and provided with a secondary coil to be placed in circuit with a local battery, and a second relay, adjusted to respond to a stronger distant battery than the first, and adapted, at the instant its armature begins its forward movement, to cause, by said movement, the current of the local battery to pass through the secondary coil of the first relay, and at the instant the said armature begins its backward movement to break the circuit of said local battery, substantially as and for the purpose described.

2. An electro-magnet and its armature provided with an insulated contact-point and front and bacl: stops therefor, and a movable contact piece with two points, one interposed between the armature and one of the said stops and the other between the insulated point of the armature and the other stop, whereby, when the parts are suitably connected in circuit with a battery, the circuit of the said battery is changed or broken the instant the said armature begins its movement in either direction, substantially as described.

3. ln a telegraphic apparatus, a relay and its armature provided with an insulated contact-point and front and back stops therefor, combined with a movable contact-piece having two points, one between the armature and one stop and the other between the insulated point of the armature and the other stop, the said contact-piece being adapted to remain in contact with either of the said stops until positively moved into contact with the other stop, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnessess.

JOHN CORNELIUS WILSON.

itnesses N. F. O. WHITNEY, J os. P. LIVERMORE.

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