JPH089944Y2 - Telephone outlet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a telephone outlet that is connected in parallel to one telephone line.

[Prior Art] When a plurality of telephones are connected in parallel to one telephone line, when one telephone is talking on the other hand, when the handset of another telephone is picked up, a conversation may be heard. there were.

Therefore, various devices have been devised so that a confidential call can be made even when telephones are connected in parallel to one telephone line. For example, conventionally, there is an automatic converter that includes a plurality of modular jacks for connecting telephones, and connects only telephones connected to these modular jacks whose handset is picked up to a telephone line.

[Problems to be solved by the invention] However, in this automatic converter, since the telephone line is branched to a plurality of telephones, for example, the first floor and the second floor
There is a problem that it is not possible to easily deal with the case where the telephone is installed in a far away place such as a floor.

The present invention has been made in view of the above points, and an object of the present invention is to provide a telephone outlet that can easily handle a telephone installed at a distant place.

[Means for Solving the Problems] In order to achieve the above object, the present invention is a telephone outlet that is connected in parallel to one telephone line, in which a rear surface is in contact with a surface to be mounted such as a wall surface. The base is attached in a fixed shape, the cover is attached to the front side of the base, the leads are attached to the base and are electrically inserted into the synthetic resin block body, and some lead pieces are electrically connected. One insert block equipped with a contact spring that contacts a plug inserted into a notch formed in the side surface of the cover and is connected in series to a DC circuit of a telephone connected to the contact spring via the plug. When the above telephone goes off-hook when it is connected to the lead piece of the insert block and the voltage at both ends becomes outgoing or incoming, conduction is established between both ends and then on-hook And a terminal block mounted on the base and connected to a lead piece of the insert block to connect a series circuit of the telephone and the confidential circuit to a telephone line.

[Operation] The present invention is connected to the lead piece of the insert block so that the direct current circuit of the telephone, which is connected to the contact spring via the plug as described above, is connected to the lead piece of the insert block so that the voltage at both ends can be transmitted or received. In this case, by providing a secret communication circuit that conducts when the above-mentioned telephone goes off-hook and maintains the continuity state until it goes on-hook, it becomes possible to connect or disconnect to the telephone line for each individual telephone by the confidential communication circuit. It is possible to replace a conventional telephone modular jack or add a new one in a certain place, and to easily install a telephone outlet with a confidential function even in a remote place. is there. That is, one insert block is provided for one housing formed by the base and the cover, and a secret circuit is connected in series to a telephone connected to a plug inserted through a notch provided in each housing, and the voltage across both ends is connected. Since it employs a configuration in which both ends are conducted between off-hook and on-hook of the telephone only when a call can be made or received, one telephone line is provided with a plurality of telephone outlets.
And, when the handset is picked up by one of the telephones and goes off-hook while the telephone is connected to each telephone outlet, the confidential circuit to which the telephone is connected becomes conductive and connects the telephone to the telephone line. However, at that time, even if the telephone line voltage drops and other telephones go off-hook, it becomes impossible to obtain a voltage on both ends that is sufficient for conduction in the confidential circuit to which the other telephones are connected.
As a result, the DC circuits of other telephones are not closed. In this way, by using one confidential circuit for one telephone outlet, a telephone outlet is provided for each telephone, and even if a plurality of telephones are installed at distant places, they can be placed near each telephone. A telephone outlet can be provided and it is not necessary to run a long cable between the telephone outlet and the telephone. Moreover, since the base is attached so that the rear surface is in contact with the attached surface, it is not necessary to form an embedding hole as in the case of embedding in the wall surface, and it can be easily attached to the wall surface or the like. . Furthermore, since the terminal block to which the telephone line is connected and the lead piece for connecting the above-mentioned confidential circuit to the contact spring are inserted into the block body of the insert block provided with the contact spring that comes into contact with the plug, The internal circuit can be wired simply by connecting the confidential circuit to the lead piece of the insert block, which reduces the number of parts and facilitates the assembly work.

[Embodiment] FIG. 1 shows a telephone outlet of this embodiment. This telephone outlet has a housing 1, an insert block 3,
The terminal block 4 is used.

The housing 1 is made of an insulating material such as synthetic resin and includes a base 10 and a cover 20. The base 10 has six terminal storage chambers 15 for storing the terminal blocks 4 one by one on both sides of the upper surface by the partition walls 11. At both ends of each partition wall 11, the base 10 is fixed to a mounting surface such as a wall surface. Mounting holes 12 through which a fixing tool such as a wood screw is inserted, and a drawing hole 13 for drawing out a telephone line connected to the terminal block 4 is formed at one end. The inner partition wall
A slit 11a into which a press-contact piece 43 of the terminal block 4 which will be described later is press-fitted is formed in 11.

The cover 20 is box-shaped with the lower surface open, and the base 10 on the side.
There is formed a notch 21 which becomes a plug insertion port when it is attached to. The cover 20 and the base 10 are respectively formed with protrusions and recesses that are fitted in a concavo-convex shape.
It fits into 10.

The insert block 3 is formed by punching a plurality of contact springs 31 and a lead piece 32 continuous with each contact spring 31 into a sheet metal having elasticity, and the lead piece 32 side is formed in a substantially U shape. While being inserted into the block body 33 made of synthetic resin, the portion of the contact spring 31 protruding from the side surface of the central piece of the block body 33 is formed by being inserted into the base 34 made of synthetic resin. The contact spring 31 has a portion projecting from the side end surface of the base 34 bent to the upper surface side of the base 34 so as to bend in the vertical direction. Further, the lead pieces 32 respectively project from the outer surface of each side piece of the block main body 33, and the tips thereof are bent downward.

The terminal block 4 is composed of a terminal frame 41 formed in a substantially U-shape that opens upward, and a lock spring 42 mounted in the terminal frame 41. The terminal frame 41 and the lock spring 42 are formed of a conductive material. Has been done. The terminal frame 41 is formed with a pressure contact piece 43 which is provided with a slit 41a and protrudes toward the leg piece side.

This telephone outlet is provided with a terminal cover 44 that covers the upper surface of the terminal storage chamber 15 with the terminal block 4 stored in the terminal storage chamber 15. The terminal cover 44 is in the shape of a box that opens downward, and elastic pieces 45 that elastically engage the outer walls at both ends of each partition wall 11 and fix the terminal cover 44 are provided so as to project from both ends of the opening edge. Further, an electric wire insertion port 46 is provided at a position corresponding to between the leg piece of the terminal frame 41 and the lock spring 42 on the upper surface. In other words, if the telephone is inserted into the electric wire insertion port 46, the telephone wire is sandwiched between the lock spring 42 and the terminal frame 41,
The wires can be easily connected. A release piece 47 is provided adjacent to the electric wire insertion port 42, and when the release piece 47 is pushed downward, the lock 42 is bent in a direction of separating the lock spring 42 from the leg piece of the terminal frame 41, and the telephone line is easily made. It can be removed.

In the telephone outlet of this embodiment, as shown in FIG. 2, only the telephone A, which picks up the handset when making a call or receiving a call, is connected to the telephone line l.
Is provided. This secret circuit 9 is a diode bridge for connecting the telephone outlet to the telephone line 1 with no polarity.
When a handset of the telephone A is picked up, that is, when the handset of the telephone A is taken off, that is, when a voltage higher than a predetermined pressure is applied to the DB and the telephone line l, a diode ZD and resistors R ₁ and R ₂ for detecting this SCRQ ₁ triggered by this series circuit and the calling signal from the central office are sent to SCRQ ₁
It is composed of a resistor R ₃ that passes regardless of the conduction of.
Therefore, if the voltage across the confidential circuit 9 is equal to or higher than the voltage specified by the Zener diode ZD, the confidential circuit 9 will conduct between both ends. Further, by using the SCRQ ₁ , once the confidential circuit 9 is conducted, the conduction state is maintained until the next on-hook operation and the interruption of the DC circuit.

In assembling the telephone outlet configured as described above, the terminal block 4 is housed in an appropriate terminal housing chamber 15 of the base 10 and the printed circuit board 91 on which the electronic components 92 forming the confidential circuit 9 are mounted is mounted. After mounting, insert block 3 is attached to base 10. The terminal block 4 is mounted so that the press contact piece 43 is housed in the insertion slit 11a. Further, in this state, the confidential circuit 9 is connected to the insert block 3 and the terminal block 4 in the state shown in FIG. And the insert block 3 is the base
Attach 34 by fixing it to the part facing the plug insertion port. At this time, the pressure contact piece 43 of the terminal frame 41 is press-fitted into the pressure contact slit 35 formed in the lower portion of the lead piece 32 of the insert block 3, and the lead piece 32 and the terminal block 4 are electrically connected. After all, insert block 3 and terminal block 4
By connecting the confidential circuit 9 and the confidential circuit 9, the contact spring 31, the terminal block 4, and the confidential circuit 9 can be electrically connected, and the insert block 3 enables wiring of the internal circuit. In this state, the terminal cover 44 is attached to the terminal block 4, and the cover 20 is attached to the base 10.

The operation of the confidential circuit 9 will be described below. A high voltage is applied to the telephone line 1 during standby, and when a calling signal is transmitted, the calling signal is input to the telephone set A through the resistor R ₃ . Therefore, the built-in bell of the telephone A rings. When the handset is picked up by this ringing, the output of the telephone A is short-circuited, a high voltage is applied to the series circuit composed of the resistors R ₁ and R ₂ and the zener diode ZD, and SCRQ ₁ is applied to SCRQ ₁ via this series circuit. Gate current is supplied, SCR
Q ₁ turns on. Therefore, the telephone set A is connected to the telephone line l. Note that when the handset is picked up and SCRQ ₁ is turned on, the voltage of the telephone line l becomes low, and therefore SCRQ ₁ does not turn on even if the handset of another telephone A is picked up after that, and thus the handset is picked up first. Only the telephone set that is connected to the telephone line l. In other words, it is possible to make a confidential call. If you pick up the handset when making a call, SCRQ ₁ turns on in the same way, this telephone A is connected to the telephone line l, and after that, the voltage of the telephone line 1 drops, so that the other telephone A's Picking up the handset does not connect the telephone A to the telephone line l.

By the way, in order to easily distinguish the telephone outlet provided with the confidential circuit 9 and the telephone outlet not provided with the confidential circuit 9, the color of the upper surface of the cover 20 may be different as shown by the diagonal lines in FIG. . As this method, a method such as painting, printing, sticking a seal, or changing the color of the molding material can be considered.

[Advantage of the Invention] As described above, the present invention is connected to the lead piece of the insert block so as to be connected in series to the direct current circuit of the telephone connected to the contact spring through the plug, and the voltage at both ends can be transmitted or received. In this case, since the above confidential telephone has a secret circuit that conducts when it goes off-hook and maintains the continuity state until it goes on-hook, it is possible to connect or disconnect the telephone line to each telephone with the secret circuit. Therefore, if the location is pre-wired, it will be possible to replace it with a conventional telephone modular jack or add a new one, and it will be easy to install a telephone outlet with a confidential function even at a remote location. is there. That is, one insert block is provided for one housing formed by a base and a cover, and as a secret circuit, both ends connected in series to a telephone connected to a plug inserted through a notch provided in each housing. Only when the voltage can be transmitted or received, a configuration is adopted in which both ends are conducted between off-hook and on-hook of the telephone, so that one telephone line is provided with a plurality of telephone outlets. And when a telephone is connected to each telephone outlet,
When the handset is picked up by one of the phones and goes off-hook, the confidential circuit to which the phone is connected conducts and connects the phone to the telephone line, at which point the line voltage on the telephone line drops and the other Even if the telephone set is turned off-hook, it becomes impossible to obtain a voltage across both terminals to conduct electricity in the confidential circuit to which the other telephone set is connected, and as a result, the DC circuit of the other telephone set is not closed. in this way,
By using one confidential communication circuit for one telephone outlet, a telephone outlet is provided for each telephone, and even if a plurality of telephones are installed at distant places, a telephone outlet is provided near each telephone. It has the advantage of not having to run a long cable between the telephone outlet and the telephone. Moreover, since the base is attached so that the rear surface is in contact with the surface to be attached, there is no need to form an embedding hole as in the case of embedding it in the wall surface, and it can be easily attached to the wall surface, etc. There is, further, since the terminal block to which the telephone line is connected and the lead piece for connecting the above-mentioned secret circuit to the contact spring are inserted in the block body of the insert block provided with the contact spring that contacts the plug, By simply connecting the terminal block and the secret circuit to the lead piece of the insert block, the internal circuit can be wired, and there are effects that the number of parts is small and the assembling work is easy.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention, FIG. 2 is a circuit diagram of a confidential communication circuit, and FIG. 3 is an exploded perspective view of a telephone outlet capable of identifying that it has a confidential communication function. 1 is a housing, 3 is an insert block, 4 is a terminal block, 9 is a secret circuit, 10 is a base, 20 is a cover, 31 is a contact spring, 32 is a lead piece, 33 is a block body, A is a telephone, l is a telephone line Is.

Claims (1)

[Scope of utility model registration request] 1. A telephone outlet which is connected in parallel to one telephone line, wherein a base is attached such that a rear surface is in contact with a surface to be attached such as a wall surface, and a front surface side of the base. And a plurality of lead pieces that are attached to the base and that are attached to the base and are inserted into the synthetic resin block body, and are electrically connected to a part of the lead pieces and are inserted through notches formed on the side surface of the cover. One insert block equipped with a contact spring for contacting the plug and a lead piece of the insert block connected in series to the DC circuit of the telephone connected to the contact spring via the plug to generate a voltage across both ends or When the above-mentioned telephone goes off-hook when it is ready to receive a call, it is attached to the base while it is installed on the base and a secret communication circuit that conducts between both ends and keeps the continuity state until on-hook. Telephone outlet with a terminal block for connecting a series circuit with the connected the phone and privacy in Read pieces over heat block to a telephone line.