US781736A - Neutral relay. - Google Patents

Description

No. 781,736. PATENTED EEB. v, 1905. 0. D. OLSEN & J. M. KINNEAR.

NEUTRAL RELAY.

APPLICATION FILED AUG. 1, 1904.

UNITED STATES Patented February 7, 1905..

PATENT OFFICE.

CHARLES D. OLSEN AND JOHN M. KINNEAR, OF DENVER, COLORADO.

NEUTRAL RELAYu SPECIFICATION forming part of Letters Patent No. 781,736, dated February 7, 1905.

Application filed August 1, 1904:. Serial No. 218,968.

To all whom it may concern:

Be it known that We, OHARLEs D. OLSEN and JOHN M. KINNEAR, citizens of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Neutral Relays; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

Our invention relates to improvements in neutral relays for use in quadruplex telegraph systems; and our object is to prevent the making of false signals due to the momentary demagnetization of the differential magnet while making current reversals at the pole-changer of a distant or terminal station. This object we accomplish by the use of an auxiliary magnet whose coil is within the same local circuit as the magnet of the relay-sounder, the said circuit being closed, whereby the current is compelled to pass through the coils of the auxiliary and sounder magnets when the main lever of, the differential magnet is in engagement with the front stop, the said lever having been primarily drawn to this position by the action of the differential magnet. We also provide an auxiliary lever located opposite the main lever and provided with an armature acted on by the differential magnet when energized. This auxiliary lever when engaging its back stop closes a shunt-circuit, whereby the auxiliary magnet is cut out of the circuit, and consequently deenergized. Now as soon as the current is reversed and the differential magnet deenergized the auxiliary magnet will act to retain the main lever in its normal position, thus causing the current to pass through the sounder-magnet, whereby the sounder-lever is held against its front stop to prevent the making of false signals, and this condition will exist unless the auxiliary lever acted on by its retractile spring reaches its back stop and closes the shunt-circuit, in which event the auxiliary and sounder magnets would be deenergized; but as the changing of polarity whereby the differential magnet is deenergizcd requires but a moment of time the differential magnet is again energized before the auxiliary lever has time to reach its back stop and shunt the current out of or around the auxiliary magnet, the said auxiliary lever being again attracted by the differential magnet, whereby it is prevented from closing the shunt-circuit during the whole time of making current reversals. This time constant or the time of no current in the differential magnet at reversals varies and is regulated by the distance the auxiliary lever has to travel between its front and back stops and also by its retractile spring to correspond with the length and capacity of the line.

Having briefly outlined our improved construction, as well as the function it is intended to perform, we will proceed to describe the same in detail, reference being made to the accompanying drawings, in which is illustrated an embodiment thereof.

In the drawings, Figure 1 is a diagrammatic view of a neutral relay equipped with our improvements, the parts being shown in the position when the differential magnet is energized. Fig. 2 is a similar view showing the position of the levers when the differential magnet is deenergized and the auxiliary magnet energized.

The same reference characters indicate the same parts in both views.

Let A designate the main battery or source of current, A and A conductors leading to the differential magnet A and A' -and A conductors leading to the main and auxiliary lines, respectively, of the system.

A is the main lever of the differential magnet and is provided with armatures A and A placed adjacent the magnets A and B, respectively. A retractile spring A is connected with the main lever and when the differential magnet is deenergized has a tendency to draw the lever away from the last-named magnet or away from the front stop M to the back stop F. A sounder N is located in the circuit of a local battery D and consists of a magnet 6, a lever N, front and back stops N and N, and a retractile spring N".

B is an auxiliary magnet, andOis an auxiliary lever oppositely located from the lever l This lever C is provided with an arma A. turc C, adapted to be acted on by the differential magnet. Connected with the lever C is a spring U, whose tendency is to draw the lever from the front stop. M to the back stop M and this will be accomplished when the differential magnet remains deenergized during a sufficient time. A shunt-conductor L leads from the front stop M of the lever A to the back stop M of the lever O. A conductor 5 leads from one pole of the local battery l) to the magnet 6 of the sounder I, while a conductor 7 leads. from the magnet 6 to the lever C. A conductor Sleads from the opposite pole of the local battery to the main lever A. A wire A" leads from the conductor L and after passing spirally around the core of the magnet Bis connected with the conductor 7, as shown at 9.

1n the working of our improvement it may be assumed that the differential magnet is energized and that the two levers A and C arein engagement with their front stops M and M, respectively, the levers having been placed in this position through the action of the differential magnet. As soon as thelever A reaches its front stop the current passes through the coils of the sounder magnet 6, whereby the sounder-lever f is drawn to its front stop and held in this position as long as the lever A is in the position stated or in engagement with its front stop, thus preventing the making of false signals during current reversals at a distant or remote station. N hen the levers A and C are in engagement with their front stops, as aforesaid, or when the main lever is in this position and theauxiliarylever is away from its back stop, the auxiliary magnet is energized and acts on the main lever with a retaining force. N ow if during a reversal of the current through the instrumentality of the pole-changer at a distant station the differential magnet A should be momentarily de'energized the tendency would be for the lever A to fall away from the front stop M, resulting in the making of a. false signal by the deenergizing of the sounder-magnet 6, whereby the sounder-lever N would be drawn against its back stop by the retractile spring N"; but the auxiliary magnet prevents this result and acts on the main lever to hold itin position against its front stop at all times while 'it will be observed that the lever A is in engagement with the front stop, not having changed its position from that shown in Fig. 1 or when the differential magnet is energized. The lever 0, however, has commenced to fall away from the front stop toward the back stop, since there is no retaining force to hold it in its position against the front stop. However, in the ease of the main lever A the auxiliary magnet acts with a retaining force, as heretofore stated, on the armature A to maintain the main lever in its position against the front stop, and this position it will occupy during the making of current reversals, since the differential magnet will be again onergized before the auxiliary lever can reach its back stop and cut the auxiliary magnet out of the circuit.

Having thus described our invention, what we claim is-- 1. The combination with the differential magnet, main lever and sounder of a neutral relay, of an auxiliary magnet arranged in suitable proximity to the main lever of the relay, a circuit in which the auxiliary magnet and sounder-magnet are located, the said circuit being closed by the movement of the main lever to its front stop when the differential magnet is energized, the main lever being then retained against its front stop by the auxiliary magnet whereby the sounder-lever is pre vented from making a false signal during ourrent-reversals, an auxiliary lever located to be acted on by the differential magnet when energized, and a short circuit around the auxiliary magnet, said circuit being closed by the auxiliary lever when engaging the back stop.

2. The combination with the differential magnet, the main lever and sounder of a neutral relay, of an auxiliary magnet located in suitable proximity to the main lever of the relay, a local circuit in which the auxiliary magnet and sounder-magnet are located, the said circuit being closed when the main lever is in engagement with its front stop to which position it is attracted by the differential magnet when energized, and in which position it is retained by the auxiliary magnet after the differential magnet has been deenergizcd, an auxiliary lever located to be acted on by the differential magnet when energized, and a shunt-conductor forming a short path for the current of the local circuit around the auxiliary magnet when the auxiliary lever is in engagement with its back stop.

3. The combination with the differential "magnet, main lever and sounder of a neutral relay, of an auxiliary magnet located in suitable proximity to the main lever, the latter being provided with an armature adapted to be attracted by the auxiliary magnet when energized, a circuit in which the coils of the auxiliary and sounder magnets are located, an auxiliary lever having an armature located to be acted on by the differential magnet when energized, the circuit being closed through the coils of the auxiliary andsounder magnets when the main lever engages its front stop, and the auxiliary lever is away from its back stop, and a shunt-conductor forming a short path for the current around the auxiliary magnet when the auxiliary lever is in engagement with its back stop.

at. The combination with the differential magnet, main lever and sounder of a neutral relay, of an auxiliary magnet for automatically holding the main lever in the position to which it has been attracted by the energized differential magnet, after the latter has been denergized, an auxiliary lever located in proximity to the differential magnet, a circuit which is closed to energize the auxiliary and sounder magnets when the main lever is held in the said position and the auxiliary lever is away from its back stop, and a short circuit around the auxiliary magnet, closed by the auxiliary lever when the latter is against its back stop.

5. The combination with the difierential magnet, main lever and sounder of a neutral relay, of an auxiliary magnet, a circuit in which the auxiliary magnet and sounder-magnets are located, the said circuit being closed by the main lever when attracted by the differential magnet, the auxiliary magnet acting to hold the main lever in the circuit-closing position during the making of current reversals as described, an auxiliary lever in proximity to the differential magnet, and a short circuit around the auxiliary magnet, closed by the auxiliary lever when against its back stop.

6. The combination with the differential magnet and main lever of a neutral relay, of an auxiliarymagnet located in suitable proximity to the main lever to attract the latter, a circuit in which the auxiliary magnet is located, an auxiliary lever located to be acted on by the differential magnet when energized, the circuit being closed through the auxiliary magnet when the main lever engages its front stop and the auxiliary lever is away from its back stop, and a shunt-conductor forming a short path for the current around the auxiliary magnet when the auxiliary lever is in engagement with its back stop.

7. The combination with the differential magnet, and main lever of a neutral relay, of an auxiliary magnet arranged in suitable proximity to the main lever of the relay, a circuit in which the auxiliary magnet is located, the said circuit being closed by the movement of the main lever to its front stop when the differential magnet is energized,the main lever being retained against its front stop by the auxiliary magnet to prevent the making of a false signal during reversals, an auxiliary lever located to be acted on by the differential magnet, and a short circuit around the auxiliary magnet, said circuit being closed by the auxiliary lever when engaging its back stop.

8. The combination with the differential magnet and main lever of aneutral relay, of an auxiliary magnet located in suitable proximity to the main lever of the relay, a local circuit in which the auxiliary magnet is located, said circuit being closed when the main lever is in engagement with its front stop to which position it is attracted by the differential magnet when energized, and in which position it is retained by the auxiliary magnet after the differential magnet has been deenergized, an auxiliary lever located to be acted on by the differential magnet when energized,and ashort path for the current of the local circuit around the auxiliary magnet when the auxiliarylever is in engagement with its back stop.

9. The combination with the differential magnet and main lever of a neutral relay, of an auxiliary magnet, a circuit in which the auxiliary magnet is located, the said circuit being closed by the main lever when attracted by the differential magnet, the auxiliary magnet acting to hold the main lever in the circuitclosing position during the making of current reversals as described, an auxiliary lever in proximity to the differential magnet, and a short circuit around the auxiliary magnet, closed by the auxiliarylever when against its back stop.

In testimony whereof we affix our signatures in presence of two witnesses.

CHARLES D. OLSEN. JOHN M. KINNEAR. Vitnesses:

DENA NELSON, A. J. OBRIEN.

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