JPH0514630Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a button telephone device, and in particular, the present invention relates to a button telephone device, and in particular, a terminal for an additional telephone coming out from a master button telephone device is necessary for a slave button telephone device or a standalone telephone device. This invention relates to a button telephone device having a switching function that can be switched depending on the situation.

[Technical background of the invention and its problems] Conventionally, the method shown in FIG. 5 or 6 has been used to add telephones.

That is, FIG. 5 shows a wiring example of a button telephone device, where 20 is a main button telephone device, 21 is a child button telephone device for expansion, and the main button telephone device and the telephone office are two-wire stations. The main button telephone device 20 and the slave button telephone device 21 are also connected by a four-wire extension telephone line 23.

In FIG. 6, individual telephone devices 30 are simply connected in parallel with two additional telephone lines 31. In FIG.

Both methods have their advantages and disadvantages, but in general, the 6th method
The diagram can be constructed more cheaply.

However, the conventional button telephone device 2 shown in FIG.
0, the four wires between the main button telephone device 20 and the child button telephone device 21 are used not only to connect the office line 22 and the main button telephone device or the child button telephone device, but also to connect the main button telephone device and the child button telephone device. Since the key telephone device has functions unique to the key telephone device for controlling the telephone devices and transmitting and receiving voices, it was impossible to connect an inexpensive stand-alone telephone device to two lines in parallel. Furthermore, if two of the four lines were configured to have the same function as the central office line 22, there was a problem in that the button telephone device itself would become expensive.

[Purpose of the invention] This invention was made to solve the above-mentioned difficulties, and the terminal for an additional telephone coming out from the main button telephone device can be used for a child button telephone device or an individual telephone device as necessary. It is an object of the present invention to provide a button telephone device having a switching function that can be switched according to the user's needs.

[Summary of the invention] In order to achieve the above object, the button telephone device of the invention has two central office lines, two voice lines connected to the two central office lines, and an extension intercom call control system. The telephone unit has a two-line control line that controls the two central office lines, and is connected to the two central office lines via a first external line extension switch, and is connected to the telephone unit 7 via the first external line extension switch. In a button telephone device equipped with a main button telephone device including an intercom unit connected to a two-line voice line via a second external line extension switch, the main button telephone device has two movable contacts and four fixed contacts. A changeover switch is interposed between the office line line and the audio line, the audio line is connected to the movable contact, the office line is connected to two of the four fixed contacts, and the other two are connected to the audio line. By connecting the central office line to the fixed contact of the switch via the external line changeover switch, the main button telephone device can be connected to the main button telephone device by switching the changeover switch, and the slave button telephone device can be connected to the main button telephone device, which consists of 2 voice lines and 2 control lines. A standalone telephone device is connected by a two-wire extension telephone line consisting of two voice lines.

[Embodiments of the invention] Preferred embodiments of the invention will be described below with reference to the drawings.

1, 3, and 4, the button telephone device of the present invention has a master telephone circuit 6 of a master button telephone device 1 and a slave button telephone device 9 connected to each other via a plug P and a jack J. ing.

More specifically, the master telephone circuit 6 has a telephone unit 7 and an interphone unit 8 as shown in FIG.

This telephone unit 7 includes a communication circuit connected to a movable contact d of a first external line extension switch _S1 ,
It consists of a handset and receiver connected to this, and a transmitting circuit. It should be noted that the fact that the telephone unit 7 is composed of a talking circuit, a handset, and a calling circuit is obvious as a necessary function for a button telephone device, and is well known as is clear from, for example, Japanese Patent Publication No. 57-18385. Also, since the circuit configuration is not a feature of the present invention, a detailed explanation thereof will be omitted. This telephone unit 7 has a first external line extension switch S ₁
2 through the normally closed fixed contact e and the movable contact d.
It is connected to the central office line 5 of the line.

The intercom unit 8 also includes a normally open fixed contact f of a first external line/extension switch _S1 and a normally open fixed contact i of a second external line/extension switch _S2 .
It consists of an extension circuit connected to the telephone, a data transmitting/receiving circuit connected to this, and a calling circuit. It should be noted that the fact that this intercom unit 8 is composed of an extension circuit, a data transmitting/receiving circuit, and a calling circuit is self-evident as a function necessary for a telephone device. The deciding factor for passing the Kankan exam series Analog 2
As is clear from pages 60 to 61 of "Seed Practical Problems," the circuit configuration is well known and is not a feature of the present invention, so a detailed explanation thereof will be omitted.

This intercom unit 8 is connected to the telephone unit 7 via a first external line/extension switch _S1 , and a second external line/extension switch _S2 via a second external line/extension switch S2.
The curved line of the line is connected to line 5.

The main button telephone device 1 has two voice lines 4a and 4b connected to a two-wire office line 5, and a data transmitting/receiving circuit of the intercom unit 8 of the main telephone circuit 6 of the main button telephone device 1. It has two control lines 4c and 4d for controlling extension intercom calls between the telephone device 1 and the slave button telephone device 9.

Audio lines 4a, 4b and control lines 4c, 4d
are connected to terminals for additional telephones coming out of the main button telephone device 1, respectively.

In this way, the button telephone device has a main button telephone device 1 and a slave button telephone device 9 connected by a four-wire extension telephone line 4 consisting of two voice lines 4a, 4b and two control lines 4c, 4d. Ru.

Between the central office line 5 and the audio lines 4a, 4b, there are two movable contacts a, a and four fixed contacts b,
A changeover switch 3 consisting of switches b, c, and c is interposed. This changeover switch 3 is the button telephone device 1
The switch is provided in the housing 2 (FIG. 4), and manual switching operation is possible. Audio lines 4a, 4b are connected to the movable contacts a, a, a central office line 5 is connected to two of the four fixed contacts b, b, and the other two fixed contacts c, C is connected to the central office line 5 via a movable contact g and a fixed contact h of a second external line/extension switch _S2 .

In the button telephone device configured in this manner, the slave button telephone device 9 is connected to the main button telephone device 1 as a four-wire extension telephone line consisting of two voice lines 4a, 4b and two control lines 4c, 4d. Connect terminals 4 and 3 to each other via plug P and jack J, and in this state, switch 3
When the movable contacts a, a are closed to the fixed contacts c, c by switching the main button telephone device 1, as shown in FIGS. By means of the circuit and the transmitting circuit, an outside line call can be made via the two curved line 5 via the movable contact d and the normally closed fixed contact e of the first outside line extension switch _S1 .

Further, the slave button telephone device 9 also connects the two-wire voice lines 4a, 4b to the movable contacts a,
An outside call can be made via the central office line 5 through fixed contacts a, fixed contacts c and c, and a movable contact g and fixed contact h of the second outside line/extension switch _S2 .

Further, with the movable contacts a, a of the changeover switch 3 closed to the fixed contacts c, c, the movable contact d of the first outside line/extension line changeover switch _S1 and the movable contact g of the second outside line/extension line changeover switch _S2 are closed. are switched to the fixed contacts f and i, respectively, the office line 5 is disconnected, and the telephone unit 7 of the main button telephone device 1 and the slave button telephone device 9 are switched to the first external line extension switch S1 and the second external line switch _S1 . It is connected via the external line extension switch S ₂ and the 2-wire voice lines 4a and 4b, and is connected to the 2-wire control lines 4c and 4 by the extension circuit, data transmission/reception circuit, and calling circuit of the intercom unit 8.
A control signal for an extension intercom call between the main button telephone device 1 and the slave button telephone device 9 is sent via the main button telephone device 1 and the slave button telephone device 9, and an extension intercom conversation can be made with the slave button telephone device 9. Furthermore, when the main button telephone device 1 is making an outside line call, it can be put on hold and an extension intercom call can be made with the child button telephone device 9, and if necessary, the outside line call can be transferred to the child button telephone device 9. .

Next, the main button telephone device 1 is connected to the independent telephone device 9a.
When trying to connect, as shown in Figure 2,
The movable contacts a, a of the changeover switch 3 are connected to the fixed contacts c,
If it is disconnected from c and fixed contacts b and b are closed, the office line 5 is directly connected to the audio lines 4a and 4b. These lines are connected from the terminals to the corresponding terminals of plug P, so
By connecting the corresponding terminal of the jack J of the independent telephone device 9a to this, the independent telephone device 9a can be connected to the main button telephone device 1.

In this connected state, the main button telephone device 1 and the independent telephone device 9a are each capable of making an outside call. However, the first external line/extension switch
Even if the movable contact d of _S1 and the movable contact g of the second outside line/extension switch _S2 are switched to the fixed contacts f and i, respectively, the main button telephone device 1 and the independent telephone device 9a cannot make an extension intercom call.

[Effect of the invention] As is clear from the above embodiments, according to the button telephone device of the present invention, the button telephone device of the present invention is connected to a two-wire central office line and a two-wire central office line. It has two voice lines and two control lines for controlling internal intercom calls.
A telephone unit connected to the central office line of the telephone line via a first external line extension switch, telephone unit 7
A button telephone device comprising a main button telephone device including an intercom unit connected to a first external line extension switch and a second external line extension switch connected to a two-line voice line. A changeover switch consisting of three movable contacts and four fixed contacts is interposed between the office line and the voice line, the voice line is connected to the movable contacts, and two of the four fixed contacts are connected to the voice line. By connecting the central office line to the 2 fixed contacts and connecting the central office line to the other two fixed contacts via the external line extension switch, you can switch the extension telephone from the main button telephone device by switching the switch. It is possible to provide a switching function for switching the terminal for a child button telephone device or for an individual telephone device as necessary.

In addition, it can be configured at a lower cost than a key telephone device in which part of the wiring has the function of a central office line.
Moreover, since the wiring can be switched as needed to make it work in the same way as a central office line, even those without construction qualifications can build a system that meets the needs of users.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of one usage example of the button telephone device according to the present invention, Fig. 2 is a circuit diagram of another usage example of the button telephone device, and Fig. 3 is a main telephone built in the button telephone device. The circuit diagram of the circuit, Figure 4 is an external view of the same button telephone device, Figures 5 and 6 are
The figures are circuit diagrams of a conventional button telephone device and a conventional standalone telephone device, respectively. 1... Main button telephone device, 3... Changeover switch, 4... 4-wire extension telephone line, 4a, 4b...
...2-wire audio line, 4c, 4d...2-line control line, 5...Station line line, 7...Telephone unit, 8...Intercom unit, 9...Subbutton telephone device, 9a...Single telephone Device, S ₁ ... 1st
external line/extension line changeover switch, S ₂ ...Second external line/extension line changeover switch, a, a...2 movable contacts, b,
b, c, c...4 fixed contacts.

Claims (1)

[Scope of utility model registration request] It has two central office lines 5, two voice lines 4a and 4b connected to the two central office lines, and two control lines 4c and 4d for controlling internal intercom calls, and Line station line 5
a telephone unit 7 connected to the telephone unit ₇ via a first external line switching switch S1;
an intercom unit 8 connected to the external line extension switch _S1 and connected to the two audio lines via a second external line extension switch _S2 .
In the button telephone device, a changeover switch 3 consisting of two movable contacts a, a and four fixed contacts b, b, c, c is connected to the central line and the voice line. and the movable contacts a, a to the audio line 4.
a and 4b, and two of the four fixed contacts
Connect the station line to the fixed contacts b, b,
By connecting the office line to the other two fixed contacts c and c via the outside line extension switch S ₂ , the main button telephone device 1 is connected to the slave button telephone device by switching the changeover switch 3 . 9 is the above 2
The standalone telephone device 9a is connected by a 4-wire extension telephone line 4 consisting of 2-line audio lines 4a, 4b and 2-wire control lines 4c, 4d, and the standalone telephone device 9a is a 2-wire extension telephone consisting of the 2-wire audio lines 4a, 4b. line 4
A button telephone device, characterized in that it is connected with.