JPS5848848Y2 - Call line discriminator - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a speech line discriminator suitable for use at cable core switching construction sites and the like.

2. Description of the Related Art Conventionally, telephone cable core wire switching work has been carried out when a utility pole is relocated due to road construction reasons.

That is, after cutting the telephone cable installed on the telephone pole to be relocated and switching its core wire to the core wire of a separately prepared telephone cable, the telephone pole is removed and relocated.

In such core wire switching work, if the core wire that is in use is cut, it will cause inconvenience to the subscribers, so it is necessary to carefully check whether the line is busy or not before carrying out the work.

Conventionally, line test transmitters and receivers have been used for such work such as busy confirmation, and for work such as meeting (confirming the same core wire at both ends of the cable) necessary for construction work.

First, use a tool such as nippers to peel off the covering of the cable core wire, and then clip the clip cord connected to the line test handset to the bare core wire to check whether or not the core wire is in use. After checking, cut the core wire,
Switching is in progress.

In this way, the conventional work involved using tools for stripping and cutting, track test transmitters and receivers with clip cords, etc., which led to poor work efficiency and, therefore, the drawback of insufficient work efficiency. Ta.

This invention was made in order to improve the shortcomings of the prior art as described above, and therefore, the purpose of this invention is to provide a call line discriminator that can improve the workability of telephone cable core wire switching work. It's about doing.

The main points of the configuration of this invention are that the telephone line discriminator is equipped with a cable core wire stripping and cutting tool that is integrally equipped with a terminal that is to make electrical contact with the cable core wire, and a grounding device that is to be grounded to the earth. The present invention includes a listening means electrically connected between the terminal of the tool and the grounding device.

Next, embodiments of this invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of this invention;
The figure is an electrical circuit diagram showing an example of electrical connections within the connection box 4 in FIG. 1.

Please refer to FIG.

This figure is a perspective view showing the entire telephone line discriminator according to this invention. Reference numeral 1 denotes a nipper with a terminal (detailed structure will be described later), and a cord 5 is connected to one of the handles of the nipper.

Further, 2 is an earphone, 3 is a grounding clamp, 4 is a connection box, and 7 is a light emitting diode, and these are electrically connected to each other in the connection box 4 as shown in FIG.

In FIG. 2, 6 indicates a varistor, 8 a resistor, and 9 a capacitor.

When using the telephone line discriminator configured as described above to perform cable switching work, etc., attach the grounding clamp 3 to the ground, place the earphone 2 in your ear, and connect the connection box 4.
Attach it to your chest pocket or clothes, etc., hold the terminal nipper 1 with either your right or left hand, and hold one of the cable core wires (not shown) (two telephone core wires, L2, whichever one is). Insert the blade of nipper 1 into the coating.

At this time, in the circuit shown in Fig. 2, the core wire is connected to the ground of the grounding clamp 3 through the nipper 1, capacitor 9, earphone 2, varistor 6 in the connection box 4, light emitting diode 7, resistor 8, etc. from the core wire (not shown). You can check whether there is a call.

In other words, construction work is carried out while listening through the earphones 2 and using the blinking of the light-emitting diode 7 to identify whether the cable core line is busy, which includes a mixture of a large number of call lines and idle lines, thereby preventing erroneous disconnections during subscriber calls. At the same time, even if a call is in progress, the nipper 1 can be attached to one side of the call core.
Since there is no one around the blade, there is no chance of any dissonance (sounds like rasping) being mixed in.

The following table shows the criteria for determining whether the cable core wires can be cut or switched.

How to read this table is as follows.

For example, when the line is busy, the user can hear talking, hold music, or room noise through the earphones 2, so it is determined that the core wire should not be cut.

Also, at this time, the polarity of the communication core wire is L1 - 48V and L2
is in the ground, so when the blade of nipper 1 is in contact with the L1 line, the light emitting diode 7 is ignited, and the blade of nipper 1 is in contact with the L1 line.
When it is in contact with the 2 wires, the flame goes out.

Similar judgments are made regarding other situations.

Note that whether the light emitting diode 7 is lit or not is not necessarily necessary for determining whether or not the core wire can be cut, but providing such a light emitting device is convenient for checking for failures of the call line discriminator itself before use.

Therefore, it goes without saying that an embodiment of this invention may be one in which the light emitting diode 7 and the resistor 8 are removed.

Next, an example of the structure of the terminal nipper 1 will be explained with reference to FIG.

FIG. 3 is a top view of the nipper, and FIG. 3a is an enlarged view of the main parts thereof.

In FIG. 3, as is well known, the nipper has a handle 13,
By grasping and closing 14 with the hand, the upper blade 10 and lower blade 11 close around the pivot point 22, and the core wire can be stripped or cut.

Therefore, as shown in an enlarged view in FIG. 3a, insulators 18 and 19 are embedded in the tips of the upper blade 10 and lower blade 11, respectively, and metal terminals 20 and 21 are provided therein, which are slightly recessed.

After electrically connecting one end of an insulated conductor 17 to each of the metal terminals 20 and 21, the conductor 17 is appropriately routed along the nipper body to the ends of the handles 13 and 14, and the connections attached thereto are connected. Connect to terminals 15 and 16.

If the nippers are configured in this way, after stripping the core wire using the upper blade 10 and the lower blade 11, by contacting one of the core wires with the metal terminal 20 or 21, it is possible to check whether the core wire is busy. It can be done.

The metal contacts 20 and 21 are provided on the upper blade 10 and the lower blade 11 at different positions so that they do not mesh with each other.
This is because it is convenient when it is desired to contact two core wires at the same time.

FIG. 4 is a top view showing another example of the structure of the nipper with terminal, and the view 4a is an enlarged view of the main part A thereof.

The structure example shown in these figures differs from the case shown in Fig. 3 by making a notch in the back part 25 that has nothing to do with the nipper blade, and after covering the inside with an insulator 23, the insulation coating of the insulated conductor is removed. The removed end 24 is positioned in any suitable manner as shown, and the conductor is then led to the connection terminal at the handle end in the same manner as in FIG.

In a nipper having such a structure, after the core wire is stripped by the blade, the conductor wire 4 located in the notch in the back part 25 of the blade is removed.
By touching a bare core wire to the core wire, it is possible to confirm that the core wire is busy.

FIG. 5 is a perspective view showing a specific structural example of the connection between the end of the handle 13 or 14 and the connection terminal 15 or 16 in FIG. , is an example in which a connection terminal 16 having a female screw structure is screwed thereto, opening is an example showing a jack type connection method, and C is an example in which the terminal plate 16 is screwed together, and both are described in detail. It seems that it can be easily understood without the need for .

As explained above, according to the call line discriminator of this invention, a series of operations such as stripping, listening, and cutting of the core wire to be cut in the cable core wire switching work can be performed consistently, thereby improving the work efficiency. This has the advantage of improving work efficiency and therefore improving work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of this invention, Fig. 2 is an electric circuit diagram showing an example of electrical connections inside the connection box 4 in Fig. 1, and Fig. 3 is used in an embodiment of this invention. A top view of the nipper with terminal, Figure 3a is an enlarged view of the main part, Figure 4 is a top view showing another structural example of the nipper with terminal, Figure 4a is an enlarged view of the main part, and Figure 5 is an enlarged view of the main part. In the figure, the handle end 13
, 14 and connection terminals 15 and 16. FIG. In the figure, 1 is a nipper with a terminal, 2 is an earphone, 3 is a grounding clamp, 4 is a connection box, 5 is a cord, 6 is a varistor, 7 is a light emitting diode, 8 is a resistor, 9 is a capacitor, 10 is an upper blade, 11 is the lower blade, 13 and 14 are the handles, 1
5 and 16 are connecting terminals, 17 is an insulated conductor, 18 and 19
are insulators, 20 and 21 are metal contacts, 22 is a pivot point, 23 is an insulator, 24 is an end of the conductor, 25 is the back of the blade,
shows.

Claims (1)

[Scope of utility model registration request] A cable core wire stripping and cutting tool integrally equipped with a terminal to be electrically contacted with the cable core wire, a grounding device to be grounded to earth, and an electric wire between the terminal in the tool and the grounding device. 1. A call line discriminator, comprising: a listening means connected to the call line discriminator;