US1393502A - Machine-switching telephone system - Google Patents

Description

H. P. CLAUSEN. MACHINE SWITCHING TELEPHONE SYSTEM. APPLICATION FILE!) 05c. 26. m1.

HENRY P. CLAUSEN, 0F MOUNT "VIEIRNON, NEW YORK, ASSIGNOR TO WESTERN ELEC- TRIO COMPANY, INCORPORATED, 035 NEW YORK, N. Y., A CORPORATION OF NEW roan.

Specification or Letters Patent.

1lEAGI-IINESWITCHING TELEPHONE SYSTEM.

Patented @ct. 111, 1%21.

Application filed December 26, 191?- Serial No. 208,844.

eflect certain operating refinements and improvements whereby an established connection may be more closely supervised by the parties to the connection.

More iarticularly the object is to provide means controllable by either the called or calling party to signal the other when the other, either through a misunderstanding or otherwise, has prematurely replaced his receiver on its hook.

A feature of this invention is a means to bring about the desired result. This means is arranged to be responsive to the rapid movements of a subscribers switchhook so that the operation 01": recalling the other subscriber in this system simulates the operation of attracting the operators attention in any well-known manual system. Or this means may equally well respond to a manipulation of a subscribers calling device.

According to another feature, this means is rendered ineliective when both parties have their receivers off their respective hooks so that one party may not maliciously or otherwise cause ringing current to be applied to the others line. I

According to a further-feature, ringing current is instantly pplied to the called part-ys line as soon as the automatic apparatus connected to, tested and found idle as such called line.

The drawings disclose in Figure 1 so much of a complete circuit involved in an established. connection between two substations as is necessary to a clear understimding of the invention.

In Fig. 2, the modification of a slow acting arrangement employed in Fig. 1, is diagrammatically shown.

The subscriber at substation 1 may in any ordinary manner establish connection to the connector switch which "forms the main part of Fig. 1. The brushes 2, 3 and i ot' a selector switch are then placed on the terminals 5, 6 and 7 of the trunk terminating in its connecting switch. Thereupon a circuit is established from ground, battery, the right-hand winding of line relay 8, the normal contact of armature 9 of relay 10, lower talking conductor leading to the subscribers line through the lower normal contact of relay 11, terminal 6, brush 8, to and through the subscribers apparatus at substation 1, brush 2, terminal 5, upper normal contact of relay 11, upper talking conductor, normal contact of armature 12 of relay 10, the lefthand winding of relay 8 to ground. Through this circuit relay 8 is energized, and being of the type known as a quick relay, will respond to the manipulation of the subscribers calling device. At each opening of the circuit just traced, relay 8 will actuate its armatures.

Upon the first energization of relay 8, a circuit is established from ground, the righthand armature and alternate contact of relay 8, winding of relay 13 to battery and ground. 7

Relay 13 attracts its armatures and by placing ground on the terminal 7, through left-hand armature and alternate contact, marks the seized trunk as busy.

When the subscriber at substation 1 manipulates his dial, each break of the line circuit of relay 8 establishes a circuit from ground, right-hand armature and normal ture 14.- of relay 15, winding of relay 16,

winding of primary magnet 17, first position contact and side-switch arm 18 to battery and ground. Through this circuit, re-

lay 16 andmagnet 17 are energized. Magnet 17 responds to each separate break in the subscribers line and relay 16 holds over untilthe series of impulses has ceased.

The energization of magnet 17 drives brushes 19, 20 and 21 in a primary direction in any well-known manner. Relay 16 in attracting its armatures energizes the escapeme'nt magnet 22, through its right-hand armature and alternate contact. At the end of the series oi? impulses, which serve to move the brushes 19, 20 and 21 in the primary direction a requisite number of steps, relay 16 after a short interval becomes deenergized and in turn the escapement magnet 22 becomes deenergized. In response to this deenergization the side-switch wipers are moved into their second positions.

Thereupon the calling subscriber may now send the last series of impulses which will "cause current to flow through a circuit from ground, right-hand armature and normal Should this line prove to be busy, ground will be found on the terminal 25, leading from ground, third position contact and sideswitch wiper 26 of another connector switch,

- to battery and ground.

brush 21 of this other connector switch, a multiple of terminal 25, thence to brush 21, side-switch wiper 26 and its second position contact, normal contact 01 armature 27 of relay 23, right-hand winding of relay 23, normal contact of the right-hand armature of relay 16 (when relay 16 becomes deenergized after the second series of impulses), winding of escapement magnet 22 Through this circuit the escapcment magnet 22 is held in an energizing position and the side-switch wipers are not allowed to move into their third positions. Also a source of busy tone current is connected to the calling subscribers line from transformer 28, contact and inner right-hand armature of relay 23, lower limb of the talking conductors, le1tt-hand winding of relay 10 to battery and ground, whereby through the inductive action of the two windings, this tone is transmitted to the calling subscribers line in the well-known manner.

If on the other hand the called subscribers line is idle, terminal 25 will be found to be ungrounded and the escapement magnet 22 will not be held up in the manner described. Therefore, upon its deenergization, the sideswitch wipers will be moved into their third positions and relay 15 will be energized through a circuitleading romground, third position contact and side-switch wiper 26, relay 15, third position contact and sideswitch wiper 18to battery and ground. It should be noted here that the cscapement magnet 22' is arranged to move the side switch wipers into their third position im mediately after the relay 16-becomes deenergized. During the energization of relay 16, a circuit is established from ground, lefthandarmature and contact of relay 16, relay 29 to battery and ground, which relay being slow to release will hold its armatures in their attracted positions for a short interval after theside-switch wipers have been moved into their third positionand the re lay 15 has been energized as described. Therefore immediately that the called subscribers line is seized, a ringing current is transmitted from a source of ringing current 30, the alternate contact and lower armature of relay 29, the innermost lower armature and contact of relay 15, brush 20, terminal 30 to and through the bell circuit of the called subscribers line, terminal 31, brush 19, the contact and upper armature of relay 15, the upper armature and alternate contact of relay 29 to ground. The energizing circuit for relay 29, however, is not maintained, so that after a short interval it retracts its armature, whereupon a source of intermittent ringing current is connected to the called subscribers line. This source of intermittent ringing current is here shown as a ringing current generator connected to the alternate contact and ground connected to the normal contact oi? relay 33 intermittently energized through a circuit in which is included an interrupter 34-. This source of intermittent ringing current is then connected to the innermost lower armature of a relay thence through the normal contact and lower armature of relay 29 over the circuit previously described, to the upper armature and normal contact of relay 29, the upper armature and normal contact of relay 35, the upper winding of relay 35 to battery and ground.

Through this circuit the ringing of the called subscribers bell is intermittently con tinued. When the called subscriber, in answering the summons of his bell, removes his receiver from its hook, the flow 0t cur rent ust described is so increased that the relay 35 will attract its armatures, thereby cutting off this flow of current and substituting therefor a flow oi? talking current from the windings of relay 10. The attraction of its armatures by relay 35 establishes a locking circuit from ground, battery, lower winding of relay 85, alternate contact and lowermost armature of relay 35, primary oilnormal contact 36 to ground.

Talking current is now supplied from ground primary oil-normal contact 36, through the lowermost armature and contact of relay 35, the right-hand winding of relay 10, the alternate contact and upper armature of relay 35, thence over the circuit previously described to the innermost lower armature of relay 35 and its alternate contact. left-hand winding of relay 10 to battery and ground. Relay 10 in attracting its armature interposes a break in the circuit of the release magnet 37 and at the same time reverses the flow of current in the calling subscribers line in the well-known manner.

The release of this switch depends upon the combined action of the calling and called subscribers. lVhen both have hung up their receivers and relays 8 and 10 have both tion and should the called subscriber wish to recall him, it may be done through the rapid manipulation of the switchhook at the called subscribers station li-4:. The rapid manipulation of the switchhook at this point will cause the armatures of relay 10 to vibrate. As long as relay 10 is in an energizing position, a circuit will be established from ground, contact and armature 45 of relay l0, winding of relay 38 to battery and ground. Through its inner left-hand armature relay-38 completes a circuit through the winding of relay 39 which in turn attracts its armatures. Upon the first break in the called subscribers line relay 10 momentarily retracts its armature, thereby opening the energizing circuit of relay lt retracts its armatures and thereby a circuit is established from ground, through the innermost left-hand armature and normal contact of relay 38, the left-hand armature of relay 39 (which being slow to release holds its armature attracted), and thence through the winding of relay 40 to battery and ground. Following this action relay 10 attracts its armature and a circuit for the energization of relay 38 is reestablished. Thereupon relay 41 is energized through a circuit extending from ground, outermost armature of relay 38, armature and contact of relay 40 to the winding of relay 41 to battery and ground. Upon the second break in the called subscribcrs line, the relay 38 is deenergized momentarily. whereby a circuit is established from ground, the outer lefthand armature and normal contact of relay 38 through the armature and contact and 1-2 energized and in turn the relay 11 will remain energized.

This will cause ringing current from the generator 46 to flow through the alternate contact and lower armature of relay 11, terminal 6, brush 3, to and through the bell circuit at the substation 1, brush 2, terminal 5, upper armature and alternate contact of relay 11 to ground.

It will be noticed that, in a similar manner, the subscriber at substation 1 may cause the relay 29 to become energized should the called subscriber prematurely hang up his receiver. If, in answer to the first summons sent, the subscriber does not answer, the calling subscriber may cause the relay 29 to again become energized by actuating his switchhook.

It should also be noticed that, after a connection is established, should either subscriber attempt to cause the flow of ringing current in the other subscribers instrument, he will fail, for as long as the subscriber toward whom this action is directed has his receiver oil the hook, the circuit of the ringing relay associated with his end of the line will be disconnected at the outermost left-hand armature ol his supervisory relay.

Fig. 2 represents a modification of the slow acting mechanism represented by the train of relays 38 to l2 inclusive. Relay 1() corresponds to relay 10 of Fig.1 and relay 8 corresponds to relay 8 of Fig. 1. There is this difference in the construction, however, that the innermost armature and contacts are arranged so that ground is transmitted to the winding of a slow acting magnet 38 only during the movement of said armatures. Being of the make-before-break type, this ground is connected only while the armature is in transit. Thus the manipulation of a subscribers switchhook will cause a series of impulses from ground, the contacts of either supervisory relay, the winding of slow acting magnet 38 to battery and ground. Upon the first impulse, this magnet so moves its plunger 50 that the contact 51, which corresponds to the righthand armature and contact of relay 39, is opened. It a train of several impulses is sent to the winding of magnet 38 in the manner described, the roller 52 associated with the plunger 50 will come in contact with the lever 53 and moving upwardly will displace the lever 53 toward the right. Upon the outer movement of the plunger 50 in re sponse to the cessation of impulses, the roller 52 coming in contact with the upper side of the bent portion of lever 53 will cause it to be displaced to the left, whereupon a circuit is established from ground, the contact 54:, the lever 53, and thence to the outermost left-hand armature of that supervisory relay controlled by the subscriber who has prematurely hung up, and in the manner previously described either the relay 11 or 29 will be energized and the subscriber recalled.

- WVhat is claimed is 1. In a telephone system, telephone lines, a call bell associated with each of said lines, selective switches controlled by a calling subscriber for establishing connections between said lines, and means under control of either of two lines involved in a connection for operating the call bell of the other.

2. In a telephone system, telephone lines, acall bell associated with each of said lines, selective switches for establishing connections between said lines, meansfor operating the call bell of a called line, and means under control of either a calling or called line for operating the call bell of a calling or called line.

3. In a telephone system, telephone lines, selective switches controlled by a calling subscriber for establishing connections between said lines, means for instantaneously signaling the called line upon the establishment of a connection, means for resignaling the called line before disestablishing the connection, and means for signaling the calling I line before the disestablishment of the connection,

. connection, means under control of said calling line for subsequently operating the call bell of said called line, and means under control, of said called line for operating the call bell of said calling line.

5. In a telephonesystem, a calling line, a called line, subscriber controlled means for establishing a connection therebetween, meansfor signaling said called line upon the establishment of such connection, means, under control of said calling line for resignaling said called line, means under control of said called line for signaling said calling line, and means under control of the signaled line for disabling said signaling means.

6. In a telephone system, a calling line, a called line, electrically operated switching devicesfor establishing a connection therebetween, means for instantaneously signaling said called line upon the establishment of such connection, means under control of 7 said calling linefor resignaling said called line, and means under control of said called line for signaling said calling line.

7. In a telephone system, the combination of telephone lines, a call bell associated with each of said lines, switching means for in terconnecting said lines and a source of signaling current for actuating said call bells,

- of a slow releasing relay included in said switching means for controlling the application of said signaling current to said lines,

a circuit for the transient energization of said relay incident to the establishment of a connection, means under control of a calling line for thereafter reestablishing said circuit.

8. In a telephone system, the combination of telephone lines, a call bell associated with each of said lines, switching means for interconnecting said lines and a source of signaling current for actuating said call bells, of a slow releasing relay included in said switching means for controlling the application of said signaling current to said lines, a circuit for the transient energization of said relay incident to the establishment of a connection, means under control of a calling line for thereafter reiistablishing said Cir cuit, and means unoer control of the signaled line for opening said circuit.

, 9. In a telephone system, a combination of telephone lines, a call bell associated with each of said lines, a connector switch in which said lines terminate, means for setting said connector switch on said lines, and a source of signaling current for actuating said call bells, of a relay for controlling the application of said signaling current to the line upon which said switch has been set, of a second relay for controlling the application of said signaling current to the line under the control of which said switch has been set, means under control of said calling line for energizing said first relay, and means under control of the called line for energizing the said second relay.

10. In a telephone system, a calling line, a called line, means for intercoimecting said lines, means under control of either of said lines when interconnected for signaling the other, said signaling means including a slow acting mechanism responsive to a series of impulses created in either of said lines.

11. In a telephone exchange system, a calling line, a called line, means for interconnecting said lines including means for signaling said called line incident to the establishment of a connection between said lines, and a slow acting mechanism responsive to a series of impulses created in either of said lines for signaling the other.

12. In a telephone exchange system, a ealling line, a called line, means for interconnecting said lines including means for signaling said called line incident to the establishment of a. connection between said lines, a slow acting mechanism responsive to a series of impulses created in either of said lines for signaling the other, and means for nullifying the effect of said mechanism.

In witness whereof, I hereunto subscribe my 7name this 18th day of December, A. D. 191

HENRY P. CLAUSEN.

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