US1806546A - Telephone system - Google Patents

Description

May 19, 1931. R. LJ MAURER TELEPHONE SYSTEM 7 Filed May 29,1929

mm H m Patented May 19, 1931 UNITED STATES PATENT OFFICE RUSSELL L. MAURER, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-FOURTH TO GEORGE E. MUELLER, OF CHICAGO, ILLINOIS TELEPHONE SYSTEM,

Application filed May 29,

My invention relates to a telephone system and more particularly to a system having means for mechanically interconnecting a local telephone system with an outside telephone system. a

In many cases it is convenient or desirable to have a private telephone system in a manufacturing or business establishment for communicating between the various departments.

19 Such a system if privately owned is not subject to charges usually made by telephone companies for this service. However it often becomes necessary to communicate with outside parties and in view of the fact that telephone companies do not permit electrical connection to be made with their apparatus I have devised a means for establishing a mechanical connection between any one of a number of telephones in a private system and an outside telephone.

An object of the invention is to provide a new and improved telephone system. A further object is to provide a simple a and eflective apparatus for mechanically establishing communication between an extension or local telephone and an outside telephone system.

A further object is to provide a connecting telephone having a remote control for mak- 50 ing the necessary operating conections.

A further object is to provide a remote control apparatus for controlling a master telephone and a connecting or repeating tele-.

phone mechanically associated therewith. In accordance with the general features of the invention a connecting telephone is mechanically associated with a master telephone connected to an outside telephone system and a link circuit is provided for connecting any one of a number of extension telephones with each other or to the connecting telephone to establish communication between an extension telephone and the master telephone system. l

The single figure of the drawing is a schematic diagram of a telephone system embodying the invention. The apparatus comprises in general a n master telephone M connected to an outgoing telephone system, a connecting or repeating 1929. Serial No. 366,932.

telephone M mechanically associated therewith, a plurality of extension telephones N and N only one of which is shown in full, and a cord circuit C for interconnecting the extension telephones with each other or with the repeating telephone M.

The master telephone M may be of any suitable type and includes the usual transmitter 9 andreceiver 10. The receiver 10 is normally removed from the receiver hook 11 but the receiver hook is yieldingly held in its normal or down position by an armature 22 actuated bya spring 12. A receiver 13 of the connecting telephone M is placedin close proximity to the transmitter 9 of the master telephone M so that the sound produced in the receiver 13 is communicated to the transmitter 9, and the transmitter 14 of the connecting telephone M is placed in close proximity to the receiver 10 of the master telephone M so that the sound produced in the receiver 10 is communicated to the transmitter 14. In the connecting telephone illustrated, the receiver 13 is in series with the secondary of'an induction coil 15 the primary of which is connected across the talking lines 16. A condenser 17 is provided in the receiver circuit to prevent direct current from flowing through the receiver. In order to disconnect the receiver and transmitter of the connecting telephone when the telephone is not in use a pair of contacts 18 is provided which are adapted to be placed in series with the transmitter 14 by an armature 19 actuated by an electromagnet 21. Armature 22 is also associated with the electromagnet 21 and serves to raise the receiver hook 11 to connect the master telephone with the line L when the electromagnet 21 is energized. 'vVhile two armatures 19 and 22 are shown it will be understood that in practice a single armature may be used to accomplish the functions of both. The electromagnet 21 is energized by a battery 23 which is grounded at 24. t

' Extension telephones N and N are shown as of the common battery system type having a transmitter 25 and receiver 26 and receiver being normally placed on hook .20. Line conductors 27 lead from the extension telephone to a jack 28. A pair of contacts 29 are normally engaged by spring contact arms of the ack and lead through a relay 31 having two windings, to opposite poles of a battery 33 one pole of which is grounded at 32. Relay 31 with armature serves in one of its functions as a relay which when closed lights a line signal lamp 34 from a battery 35. It will be seen that when receiver 26 is re moved from its hook a circuit will be estab lished from battery 33 through the upper winding of relay 31 to one contact 29; ack 23, transmitter 25, receiver 26 through the other side of jack 28, contact 29 through thelower winding of relay 31 to ground 32 thus energizing the relay to light the signal lamp 34.

Although a number of batteries are shown in the drawing it is to be understood this is simply as a matter of convenience and they are preferably one and the same battery.

The cord circuit C comprises talking conductors 41 and 42 terminating in a pair of plugs 43 and 44. lVhen the plug 43 is inserted in the jack 28 in response to the lighting of line lamp 34 when a call is made, the contacts 29 will be broken to deenergize the relay 31 and extinguish the line lamp 34. At the same time contact 45 of plug 43 will be grounded through the jack sleeve tending to establish a circuit from battery 47 through contact 48, supervisory lamp 49, to ground. However, when the plug 43 is inserted in jack 28 relay 51 will be energized to open the circuit of contact 48 and prevent the supervisory lamp 49 from being lighted. The battery 47 is connected at its opposite poles through the upper and lower windings of relay 51 to the lines 41 and 42 to supply talking current to the extension telephone. The breaking of the circuit in the extension telephone due to returning the receiver to its hook will interrupt the circuit through relay 51 and light the supervisory lamp until the plug 43 is removed from jack 28.

An operators telephone 52 is connected across conductors 41 and 42 through a key 53. hen a signal is received from an extension telephone by the lighting of the line signal lamp the operator inserts the plug 43 in jack 28 and upon ascertaining that an outside party is wanted inserts plug 44 in jack 54 connecting the talking conductors 41 and 42 to the conductors 16 of the connecting or repeating telephone. Jack 54 is provided with a spring contact 55 which is insulated from the contact arms of the jack and engages a contact member 56 grounded at 57 when plug 44 is inserted in the jack. The engagement of spring contact 55 with the contact 56 establishes a circuit from battery 23 through electromagnet 21, spring contact 55, contact 56 to ground 57 thus energizing the electromagnet 21 and actuating armatures 19 and 22 to establish electrical communicating connections in the master telephone M and repeating telephone M. The talking current for the connecting telephone is supplied by abattery 61 the opposite poles of which are connected through a relay 62 to conductors 41 and 42. A contact 63 is associated with relay 62 and connects the battery 61 through a supervisory lamp 64 to the ground 65' of the sleeve of jack 64. This supervisory lamp is not lighted when the plug 44 is connected to the jack 54 and serves no function unless the link circuit is used to interconnect a pair of extension telephones. Suitable condensers 66 and 67 are provided in thelines 41 and 42 of the link circuit to prevent direct current from flowing therein as is well known in the art.

The operation of the apparatus is as follows:

When a call comes in from the master telephone M the operator hears the bell of this telephone and inserts the plug 44 in jack 54 to raise the receiver hook of telephone M and establish the proper electrical connections in the telephone MC The operator then actuates key 53 to connect the operators telephone and upon learning the name of the party being called inserts the plug 43 in the jack 28 of the proper extension telephone causing the supervisory lamp 49 to be lighted until the receiver of the extension telephone is removed. In order to call the party at the extension telephone a ringing key 71 is provided having a ground 72 and a source of ringing current 73. When the call is ended the supervisory lamp 49 will again be lighted by the receiver of the extension telephone being placed upon its hook- The operator then withdraws plugs 4344 thereby deenergizing magnet 21 to restore switch hook 11 to open the circuit of line L thereby givingthe usual disconnect signal to the operator at the main exchange so that the connection there may be taken down in the usual manner.

A call originatingat anextension telephone causes theline lamp 34 to be lighted which is extinguished as soon as the plug 43 is inserted in jack 28. The plug 44 is then inserted in ack 54 and either the operator or the person at the extension telephone may transmit the proper number to the master telephone which leads to the main exchange. The operator at the main exchange then connects the master telephone with the party at the number called in the usual manner thereby completing the call' from the extension telephone to the outside party. hen the call is ended the party at the extension hangs up the receiver 26 causing supervisory lamp 49 to be lighted as described above. The operator then withdraws plugs 43-44 thereby deenergizing magnet 21 to restore switch hook 11 to open the circuit of line L thereby giving the usual disconnect signal to the operator at the main exchange.

Calls from one extension telephone to another are handled as in the ordinary branch exchange. The raising of the receiver of an extension telephone lights line lamp 34 until plug 43 is inserted in jack 28. The operator upon learning that a call is being made to one of the extension telephones inserts plug 44 in the jack of the extension telephone called resulting in the lighting of supervisory lamp 64. The operator then actuates ringing key 74 which is similar to key 71. As soon as the party called answers lamp 64 will be extinguished. When the call is ended the hanging up of the receiver at either end will cause one of the supervisory lamps to be lighted to signal the operator to disconnect the cord circuit.

In order to make the extension telephone available when the operator is absent as for instance after regular working hours means are provided whereby the extension telephones may be connected to the repeating telephone M so that a call may be made from any one of the extension telephones as N--N out to the distant exchanges over conductors 7576 to which the extension telephones as NN may be connected by switches 77. Conductors 75 are connected to the talking conductors 16 of the connecting telephone M and conductor 76 is connected to the conductor leading to the electromagnet 21. Each of the extension telephones is provided with a contact member 81 adapted to be engaged by a spring contact 82 adapted to be closed on contact 81 by the receiver hook of the ex tension telephone. The spring contact 82 is connected to ground 83 so that when the receiver 26 is removed from its hook a circuit is established from battery 23 through coil 21, conductor 78, contacts 81-82 to ground 83 thereby causing the electromagnet 21 to be energized to establish the electrical communiating connections in the telephones M and M. When switches 77 are closed the extension telephones are provided with talking current from the battery 33 through impedance coil 31 which therefore serves a double function since it also acts as'a relay for line signal lamp 34 when the link circuit is em ployed.

Thus when a call is to be extended from a telephone as N or N directly to the outgoing line L by connect'ng and master telephones M-M, the party calling simply removes receiver 26 from its hook which automatically causes the proper connections to be made in the connecting telephone M, and raises the receiver hook of the master telephone to connect it to line L leading to the main exchange. As soon as the exchange operator responds the party calling gives the operator the number desired and the call is completed in the usual manner. WVhen the call is ended the hanging up of the receiver of the extension telephone disconnects the connecting telephone and restores the receiver hook of the master telephone to its normal or down position thereby giving the exchange operator the usual disconnect signal.

A call coming from the master telephone may be answered directly from an extension telephone when switches 77 are closed. A person at an extension telephone hearing the bell of the master telephone ringing may by raising the receiver of the extension telephone automatically establish the proper connections in the connecting and master telephones M and M as described above and communicate with the party calling. When the call is ended the hanging up of the re ceiver at the extension telephone again disconnects the connecting and master telephone and gives the exchange operator the disconnect signal as described.

It will be understood that the embodiment of the invention described above is merely illustrative and that many modifications may be made Without departing from the spirit and scope of the invention.

What I claim as new and desire to protect by United States Letters Patent is:

1. An apparatus for mechanically interconnecting separate telephone systems comprising a master telephone having a transmitter and receiver, a connecting telephone having a. transmitter and receiver in sound transmitting relation to the receiver and transmitter respectively of the master telephone, an extension telephone electrically connected to the connecting telephone, and meansresponsive to the movement or" the receiver hook of the extension telephone for moving the receiver hook out the master telephone whereby communication is established between the extension and master telephones.

2. An apparatus for mechanically interconnecting separate telephone systems comprising a telephone electrically connected to one system and having a transmitter and receiver, a connecting telephone having a transmitter and receiver in juxtaposition to the receiver and transmitter respectively of the first mentioned telephone, an extension telephone electrically connected to said connecting telephone, an electromagnet for placing the first mentioned telephone in communicative condition, a separate circuit for said electromagnet leading to the extension telephone, and means associated with the extension telephone tor closing said circuit when the extension telephone is placed in communicating condition.

3. An apparatus for mechanically interconnecting separate telephone systems comprising'a master telephone electrically connected to one system, a connecting telephone mechanically associated therewith 'to receive and transmit messages thereto, an extension telephone electrically connected to the connecting telephone, an electromagnet, means associated with said electromagnet for placing both the master telephone and the connecting telephone in communicating condition when the electromagnet is energized, and means associated with the extension telephone for causing the energization of said electromagnet.

t. In an apparatus of the class described a master telephone electrically connected to a telephone system, a connecting telephone mechanically associated therewith to receive and transmit messages thereto, an extension telephone, a cord circuit, and means for placing the master telephone and connecting telephone in communicating condition when the cord circuit is electrically connected to the extenson telephone and the connecting telephone.

5. In an apparatus of the class described a master telephone electrically connected to a telephone system, a connecting telephone mechanically associated therewith to receive and transmit messages thereto, an extension telephone, a. cord circuit, and means for placing the master telephone and connecting telephone in con'nnunicating condition when the cord circuit is electrically connected to the connecting telephone.

6. In an apparatus of the class described a master telephone, a connecting telephone mechanically associated therewith, an electromagnet, movable means associated with said electromagnet for placing the master telephone and connecting telephone in communicating condition, a cord circuit, and means for energizing said electromagnet when the cord circuit is electrically connected to the connecting telephone.

7. In an apparatus of the class described an extension telephone, a master telephone electrically connected to a telephone system, a repeating telephone mechanically asso ciated with the master telephone and electrically connected with the extension telephone, an electromagnet, movable means asso ciated with said electromagnet for placing the repeating telephone and master telephone in communicating condition, and means associated with the extension telephone for energizing and decnergizing said electromagnet.

8. In an apparatus of the class described an extension telephone, a master telephone, a repeating telephone mechanically associated with the master telephone, a-cord circuit connectible between the extension telephone and the repeating telephone, means for placing the repeating telephone and master telephone in communicating condition when the cord ircuit electrically interconnects the extension and repeating telephones, means for directly interconnecting the extension telephone and the repeating telephone without the interposition of the cord circuit and means associated with the extension telephone for actuating the means for placing. the repeating telephone and master telephone in. communicating condition when the extension telephone and repeating telephone are directly interconnected.

9. In an apparatus of the class described a plurality of extension telephones, a cord circuit selectively connectible to any of said extension telephones, a master telephone electrically connected to a telephone system, a repeating telephone mechanically associated with the master telephone, means for establishing electrical communicating connections in both the master and repeating telephones, said means being actuated in response to connecting the cord circuit with the repeating telephone.

10. In an apparatus of the class described a plurality of extension telephones, a master telephone electrically connected to a telephone system, a repeating telephone mechani- 'ally associated with the master telephone, a cord circuit for selectively interconnecting a pair of extension telephones or connecting an extension telephone to the repeating telephone, and means for simultaneously establishing electrical communicating connections in the repeating telephone and the master telephone to provide coi'nn'innication between the master telephone system and the extension telephone.

11. In an apparatus of the class described an extension telephone, a master telephone connected to a telephone system, a repeating telephone mechanically associated therewith, means for directly interconnecting the extension telephone with the repeating telephone, an electromagnet for establishing communicating connections in the repeating and master telephones, and a spring contact in the extension telephone for causing the energization of said magnet in response to movement of the receiver hook of the extension telephone.

12. In an apparatus of the class described, a master telephone in a telephone system, a connecting telephone in a second system said master and connecting telephones being mechanically associated to transmit sounds from one to the other, an extension telephone electrically connected to the connecting telephone, a receiver and hook in said extension telephone, and means responsive to removing said receiver from said hook for establishing communicating connections in the con necting and master telephones.

13. In an apparatus of the class described a telephone system, a master telephone connectible in said system, an extension telephone system, a repeating telephone connectible in said extension system and mechanically associated with the master telephone, an extension telephone connectible in said extension system, means responsive to connecting the extension telephone to the extension system for connecting the repeating and master telephones to their respective systems, said repeating and master telephones being restored to their disconnected conditions when the extension telephone is disconnected from the extension system.

14. In an apparatus of the class described a master telephone, a repeating telephone mechanically associated therewith in sound transmitting relation, an extension telephone having a receiver and receiver hook, a line signal lamp, means for lighting said lamp when the receiver of the extension telephone is removed from its hook, a cord circuit for interconnecting the extension and repeating telephones, a supervisory lamp in said cord circuit, means for lighting said supervisory lamp when the cord circuit is connected to the extension telephone and the receiver of the extension telephone is on its hook and extinguishing said lamp when the receiver is removed from its hook, and means for establishing communicating connections in the repeating and master telephones when the cord circuit is connected to the repeating telephone and restoring the repeating and master telephones to their normal condition when the cord circuit is disconnected from the repeating telephone.

15. In an apparatus of the class described a master telephone in a telephone system, a repeating telephone in a secondtelephone system, said repeating telephone being mechanically associated with the master telephone in sound transmitting relation, and remote control means for establishing communicating connections in the repeating and master telephones.

16. In an apparatus of the class described a pair of telephones electrically interconnected by a line and each having a transmitter and a receiver, and means for electrically connecting the receiver and the transmitter in one telephone to the line in response to making similar connections in the other telephone.

17. In an apparatus of the class described a pair of telephones each having a receiver and a receiver hook, a magnet associated with one of said telephones for actuating the re-' ceiver hook, said magnet being energized in response to the position of the receiver hook of the other telephone.

18. In an apparatus of the class described a telephone system, a pair of telephones associated therewith each having a receiver and a hook therefor, an electromagnet for actuating the hook of one of said telephones for establishing communicating connections in said telephone, and a separate circuit including said electromagnet and leading to the other telephone whereby said electromagnet may be remotely controlled.

19. In an apparatus of the class described a master telephone connected to a main telephone system, a repeating telephone mechanically associated therewith in sound transmited therewith in sound transmitting relation,

an extension telephone, a cord circuit for interconnecting the repeating and extension telephones, a signal means in said master telephone, means for interrupting said signal means and establishing communicating connections in the repeating and master telephones in response to interconnecting the cord circuit with the repeating telephone.

21. In an apparatus of the class described a main telephone circuit, a master telephone connected thereto, a repeating telephone associated with said master telephone, an electromagnet, a pair of receiver hooks simultaneously operable'by said electromagnet to place said telephones in communication, a grounded battery for energizing said magnet, and a lead extending from said electromagnet to a remote point for-controlling the energization of said magnet.

In witness whereof, I hereunto subscribe my name this 24th day of May, 1929.

RUSSELL L. MAURER.

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