JPH0458487A - Safety device - Google Patents

Abstract

PURPOSE:To provide a safety device wherein mounting of a safety element is extremely easy while connection between a subscriber line and an exchanger and protection of the line against a thunder surge are simultaneously attained by providing a safety element which can be inserted between plural connection spring sets and a ground conductor. CONSTITUTION:In a safety device having eight terminals corresponding to four lines as communication lines, folded parts of contact spring sets 2a to 2n are placed on a cut 1a of an insulating board 1, subscriber terminals 5a to 5n are placed on the left side, and terminals on an exchanger side 6a to 6n and a ground terminal 7 are placed on the right side. A safety element 3a, by being inserted between one of the contact spring sets 2a1 and a ground conductor 4, allows one of electrodes 3a1 of the safety element to be connected to one of the contact spring sets 2a2 and the other electrode 3a2 to be connected to the ground conductor 4. Thus mounting of the safety element is extremely easy.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a protector for preventing overvoltage induced in a communication line or overvoltage due to contact with a power line from flowing into an exchange.

(Prior Art) Conventionally, a communication line from a subscriber's telephone to a telephone exchange at a central office has been connected via a distribution board and a third safety rack.

Fig. 15(a) shows the circuit configuration of the communication line, and Fig. 15 (a) shows the circuit configuration of the communication line.
A front view of the rack, Figure (C) is a diagram showing an example of the safety element. In these figures, subscriber line electrode 42a.

A plurality of protectors 42 having ground electrodes 42b are formed into blocks, and a plurality of protector units 43 (blocks are not shown in the figure since they are mounted on the rear side) are mounted on a safety 3 rack 44.
to be implemented. In this manner, as shown in FIG.
4az and is connected to the terminal board 14 via the jumper wire 18a.
b, is connected to the safety device 15 of the safety instrument, and then connected to the exchange 16 via the contact spring &11I5f.

Such a line configuration has the following problems.

In Figure (a), in order to connect the subscriber line 17 to predetermined exchange side terminals 16a, 16b of the exchange 16, the four terminals 14c, 14d, 14e, 14f of the distribution board 14 are connected to the Jatsuba wire 18a. In addition to the work, the safety device 42 and contact spring & 111 of the safety instrument music 44! M five terminals 15a,
15b, 15c, 15d, 15e jumper wire 18 b
, 18c.

19 connection operations are required. Even today, these jumper wire connection operations are still performed manually, resulting in poor work efficiency, requiring manpower to manage the jumper wires, and requiring an extremely long time to complete the task.

Furthermore, in order to connect the protectors to all the subscriber lines housed in the telephone office, the protectors are quite large (250cm tall).
5-1 x width 680m5+ x depth 170m),
The space occupied within the telephone office will also increase.

(Question B to be solved by the invention) The present invention deals with the work of opening a communication line using a distribution board,
The second task is to connect a safety device to the communication line.
This was proposed in order to improve work efficiency, make it more economical, and make it more compact so that only one operation is required, and to make it extremely easy to attach a safety element.

Therefore, it is an object of the present invention to provide a protector that makes the above possible.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a plurality of contact spring sets, a safety element, and a grounding conductor sandwiched between insulating plates, and one of the contact spring strings. Each end portion forms a subscriber side terminal, and the other end portion forms an exchange side terminal, and each of the contact spring sets fixes this on one end surface of the security element, and The gist of the invention is a protector characterized in that the other end surface is brought into contact with a grounding conductor.

(Function) According to the present invention, a plurality of contact spring sets, a safety element, and a grounding conductor are mounted with insulating plates in between, and one end of each of the contact spring sets forms a subscriber side terminal. , the other end portions each form an exchange side terminal, and the contact spring set is fixed to one end surface of the safety element,
By bringing the other end of the safety element into contact with the grounding conductor, the safety element is extremely easy to install, is compact, and connects the subscriber's line with the exchange easily, providing protection against lightning surges. It has the ability to perform

(Example) Next, an example of the present invention will be described along with the drawings. Note that the embodiments are merely illustrative, and it goes without saying that various changes and improvements can be made without departing from the spirit of the present invention.

(Example 1) Figures 1 (a) to (e) are diagrams showing a first example of the protector of the present invention, in which figure (a) is a plan view, figure (b) is a side view, Figure (C) is a back view, figure (d) is an enlarged perspective view of the contact spring assembly, figure (e) is an enlarged perspective view of the part where the safety element is fixed. 2 shows a protector 15 having 8 wires corresponding to 4 circuits, and in the figure, ■ indicates an insulation resistor, 2a, 2b...2n indicates a contact spring set fixed across the insulating plate 1, 3a to 3n are safety elements, 4 is a grounding conductor mounted on an insulating plate, 5a, 5b...
・5n is the terminal on the subscriber side formed on the extended part of one side of the contact spring group, 6a6b...6n is the terminal on the exchange side formed on the extended part of the other side of the contact spring group, 7 is the ground 2
This is a ground terminal that is grounded to 0.

As shown in Figures (A) and (C), the insulating plate 1 has a notch Ia on the negative side, and an L-shaped grounding conductor is provided on the back side of the insulating plate 1, as shown in Figure (C). 4 are provided. Therefore, the folded portions of the contact springs &t12a to t12n are arranged in the cutout portions 1a of the insulating plate 1, and (a)
Subscriber terminals 58 to 5n are arranged on the left side of the figure, and exchange side terminals 6a to 6n and ground terminal 7 are arranged on the upper right side. Figure (C) shows the back view, and safety elements 3a to 3n are arranged at the locations where these contact springs & [J2a to 2n intersect with a part of the contact conductor 4, and these safety elements One end of the elements 3a to 3n has a contact spring (as shown in Fig. 61) and the other end of the safety element 3a to 3n, which contacts and fixes one of the elements 12a to 2n, is for grounding. It is in contact with the conductor 4.

Contact spring! 2a, as shown in the enlarged perspective view of FIG. 1(d), two leaf springs 2a++ 28z are fixed with an insulating plate 1 in between, and a communication line is connected to the contacts 2a and 2l.

Furthermore, the communication line can be disconnected by inserting, for example, a test plug (not shown) between the two leaf springs 2a++ and 2az and opening the contact 2a3.

As shown in the enlarged perspective view of FIG. 1(e), the safety element 3a is inserted between one electrode 3a+ of the safety element and the contact spring assembly by inserting it between one side 2a+ of the contact spring assembly and the grounding conductor 4. One electrode 2a+ can be brought into contact with the other electrode 3at, and the other electrode 3at can be brought into contact with the grounding conductor 4. In this way, the safety element can be installed extremely easily.

Next, the assembly and manufacturing of this protector 15 will be explained. On the insulating plate l, contact spring sets 2a, 2b...2n, grounding conductor 4, terminals 5a, 5b...5n on the subscriber side, terminal 6a on the exchange side
, 6b, . . . , 6n, and the ground terminal 7 can be easily manufactured by connecting and fixing the ground terminal 7 by suitable means such as caulking or stapler.

The methods for fixing the safety element 3a include (a) forming a recess in the ground conductor 4 large enough to accommodate the safety element 3a (not shown), and (n) connecting the other electrode 3a+ of the safety element 3a to the ground conductor. 4 (not shown), etc. By selecting an appropriate method among these, the safety element 3a can be easily fixed in a predetermined position.

The methods for mounting the grounding conductor 4 include (a) processing a thin metal plate into a predetermined shape by pressing or the like (not shown), or ([1) mounting the wiring conductor on the insulating plate 1 by plating or the like. There is a so-called printed wiring board technology (not shown) that has been developed. By selecting an appropriate method among these, the grounding conductor 4 can be easily mounted.

In addition, soldering 1 or other means can be used to connect and fix the jumper wires 18 and 19 to each terminal.

Next, FIG. 2 is a diagram showing a circuit configuration in which a protector is mounted on a communication line, and two lines are shown. 11 is a subscriber's telephone, 12 is a subscriber protector, 13 is a telephone office, and the telephone office 13 has a distribution board 14. Safety device 15. An exchange 16 is provided, the telephone 11 is connected to a subscriber protector 12, and the subscriber protector 1
2 is connected to a distribution board 14 installed in the telephone office 13 via a subscriber line 17, and terminals 5 of the distribution board 14 and the protector 15 are connected to each other via a subscriber line 17.
Terminals 6a, 5b, and terminals 6a6b of the protector 15 and the exchange 16 are connected to each other by jumper wires 18 and 19. In this way, the required communication line is opened and the security element 3a
, 3b and the connection of the contact spring &[12a, 2b can be completed at the same time. Other lines can be connected easily in the same way.

Next, Figure 1 (a), (b), (C), (d),
The function and test of lightning surge protection will be explained with reference to (e) and FIG.

A lightning surge is induced in the subscriber line 17 shown in FIG.
If a lightning surge enters the terminals 5a and 5b of the protector 15, the operation of the safety elements 3a and 3b causes the terminals 6a and 6 to
The lightning surge voltage between the ground conductor 4.b and the ground 20 is suppressed below the allowable voltage of the exchange v116, and the energy of the lightning surge is transferred to the grounding conductor 4.b. Since it can flow to the ground 20 through the ground terminal 7, the exchanger 16 and workers can be protected from lightning surges.

Furthermore, the terminals 5a and 5b of 17 subscriber lines and the exchange 1
To disconnect the terminals 6a and 6b in the six cases and connect the test wire to one of them, use a test plug (Fig. This can be achieved by inserting (not shown). As the safety element 3a, a bidirectional pnpn surge protection device, a semiconductor safety element such as an avalanche diode or a zinc oxide varistor, or a thin and small gas-filled detonator may be used, or a multi-stage protection circuit combining these may be used. may be configured.

(Embodiment 2) Figures 3 (a), (b), (C) and (d) are diagrams showing a second embodiment of the present invention, in which figure (a) is a plan view and figure 3 (rotational view). ) is a side view, and figure 6 (C) is a back view.
In the figure, 8 is a wiring conductor formed on the insulating plate 1, and 9 is a connection land for connecting one side 2a+ of the contact spring set to the wiring conductor 8.

The other structure, which is shown in FIG. (d) as an enlarged view of this part, is the same as that of the first embodiment, and its assembly and manufacturing are the same as described in the first embodiment.

FIG. 4 shows a plan view of the protector 15 in which one of the contact springs 1u2a to 2n and the terminals 5a, 5b, . . . , 5n on the subscriber side are connected by a wiring conductor 8.

FIG. 5 shows a plan view of the protector 15 in which one of the contact springs 112a to 2n and the terminals 6a, 6b, . . . , 6n on the exchange side are connected by a wiring conductor 8.

A springy metal plate 10a is used to fix the safety element 3a, and the connection between the metal plate 10a and the wiring conductor 8 can be made using a connection land 9. An enlarged perspective view of the connection between the metal plate 10a and the wiring conductor 8 is shown in FIG. Show the diagram.

The assembly and manufacturing of the protector 15 shown in FIGS. 4 and 5 is similar to that described in the first embodiment.

(Embodiment 3) FIGS. 6(a), (b), and (C) are views showing a third embodiment of the present invention, in which FIG. 6(a) is a plan view and FIG. 6(b) is a side view. , the same figure (C) shows the back view in figure 0 (C),
The safety elements 3a3b...3n are fixed between the raised plate-like portions 4a, 4b...4n of the grounding conductor 4 and the side surfaces of one of the contact spring sets 2a+, 2b+...2nn. FIG. 6 (cut) shows an enlarged perspective view of the state in which the safety element 3a is fixed;
a protrudes from the upper surface of the insulating plate l through a through hole 41 provided in the insulating plate l.

The assembly and manufacturing of this protector 15 is similar to that described in the first and second embodiments.

(Embodiment 4) FIGS. 7(a) and 7(b) are diagrams showing a fourth embodiment of the present invention, with FIG. 7(a) showing a plan view and FIG. 7(b) showing a side view. The figure shows the two protectors 15a and 15b shown in FIG.
These are supported at predetermined intervals and assembled using screws 22, and are called submodule plates.

The protectors 15a and 15b each include a plurality of contact spring sets 2,
Subscriber side terminal 5. Safety element 3. A terminal 6 on the exchange side is provided. Note that eight lines are shown as an example.

The opening of the required communication line and the lightning surge protection of the safety element 3 are the same as those described in the first embodiment.

As shown in this example, the insulating plate 1 shown in the first embodiment
It is clear that it would be a good idea to combine multiple pieces to manufacture a safety device.

Note that instead of the insulator 21, the insulating plate l may be supported at a predetermined interval by a metal fitting (not shown) that connects the grounding conductors 4 of the protectors 15a and 15b with each other, or a connector, which will be described later. It is possible.

(Embodiment 5) Figures 8(a), 8(b) and 8(C) are diagrams showing a fifth embodiment of the present invention, in which figure 8(a) is a plan view and figure 8(b) is a side view. , the same figure (C) shows a back view. This fifth embodiment has overcurrent protection elements 23a, 23b, . . . 2 in addition to the first embodiment.
3n is added and installed. The other configurations are the same as in the first embodiment. Also, an overcurrent protection element 23a.

23b...23n are connected and fixed to predetermined positions of the leaf springs of the contact spring set by soldering or the like.

In addition, FIG. 9 is a diagram showing a line configuration in which the protector 15 is mounted on a communication line.
a, 5b are terminals on the subscriber side; 2a;

2b is a contact spring set, 3a and 3b are safety elements, and 23a.

23b is an overcurrent protection element, 6a and 6b are terminals on the exchange side, and 20 is the ground.

Next, to explain the operation, the subscriber line (not shown)
The safety element 3a may come into contact with a commercial power line due to a natural disaster, construction accident, etc.

If the non-operating voltage of 3b is applied through the subscriber side terminals 5a and 5b, the power line current will flow into the exchange side terminals 6a and 6b. In this case, by setting the operating characteristics of the overcurrent protection elements 23a and 23b to predetermined values, the exchange can be protected from overcurrent.

(Embodiment 6) Figures 10(a) and 1(b) show a sixth embodiment of the present invention, where (a) is a plan view and FIG. 1(b) is a side view.

This sixth embodiment is a subscriber side female connector 24. a male connector of the subscriber side terminal that connects with the exchange side female connector 25;
This protector has a structure in which a male connector 27 of a terminal on the exchange side is fixed to an insulating plate 1. The configuration other than the connector is as follows. Second
．． Third. This is similar to the fourth or fifth embodiment.

(Embodiment 7) FIG. 11 is a diagram showing a seventh embodiment of the present invention, in which the jumper wire 17 of the subscriber line is wrapped using a special tool with the terminal 5° on the subscriber side as the wrapping terminal. Connecting. The configuration other than the wrapping terminal 5'' is as follows. Second. Third. This is similar to the fourth or fifth embodiment.

(Embodiment 8) FIG. 12 is a diagram showing an eighth embodiment of the present invention, in which the subscriber side terminal 5'' is a clip terminal with a U-groove structure, and the jumper wire 17 of the subscriber side line is connected to the clip terminal 5''. using a special tool to break the insulation coating of the jumper wire 17 and electrically connect it.

The configuration other than the clip terminal is as follows. Second. 3rd゜4th,
Or it is similar to the fifth embodiment.

In addition to the embodiments described above, it is clear that the present invention includes the use of a crimp terminal or a screw terminal for the terminal on the subscriber side, the terminal on the exchange side, or the ground terminal.

(Embodiment 9) FIGS. 13 and 14 are diagrams explaining a ninth embodiment of the present invention, and FIG. 13 is a perspective view showing the embodiment, which is similar to the fourth embodiment shown in FIG. This figure shows a submodule with a structure in which two insulating plates 1 are stacked as a pair. The submodule includes a case 30 that supports two insulating plates 1. It is composed of a grounding terminal 31.

The structure of the two insulating plates l is the same as the seventh embodiment shown as the fourth embodiment.
This is the same as in Figures (a) and Φ). However, the terminals connected to the exchange 16 are the same as the male connector 27 shown in FIG. 10 of the sixth embodiment.

FIG. 14 is a perspective view showing an embodiment of a safety device assembled as a module by combining a plurality of sub-modules shown in FIG. 13. The protector 32 having a modular structure is
n submodules 33°33t,...33. and,
It is composed of a metal frame 34 that supports this. metal frame 34
is terminal 5. Openings 34a, 34b, and 34c are provided so that contact springs and I2° male connectors can be used, and a structure (not shown) is provided in which a plurality of submodules 33 can be fixed and can be easily inserted and removed. Also, the metal frame 34 and the submodule 33. .

33□ ...The grounding terminal 31 of 337 has a spring structure.

Electrical connection is secured by screws (both not shown) or the like. There is no need to further explain the communication line opening and lightning surge protection functions of the protector shown in FIG. 14, so they will be omitted.

Further, as described above, each terminal of the sub-module 33 is realized by either a connector wrapping terminal or a clip terminal.

(Effects of the Invention) As explained above, the present invention includes a plurality of contact spring sets, a safety element, and a grounding conductor sandwiched between insulating plates, and one end of the contact spring set is connected to each subscriber. The contact spring sets each form a side terminal and the other end forms an exchange side terminal, and each of the contact spring sets is fixed to one end face of the safety element, and the other end face of the safety element is connected to a grounding conductor. By bringing the safety element into contact with the switch, it is extremely easy to install the safety element, and the safety element can be made compact, and it has the effect of simultaneously achieving line connection between the subscriber's line and the exchange and lightning surge protection for that line.

Furthermore, there is no need for a safety instrument and there is no need to connect jumper wires to connect the safety device, which is very effective in saving labor.

Furthermore, since the volume occupied in the telephone office building can be reduced, it is also effective for downsizing and economy.

In addition, by providing a contact spring set in the protector, the subscriber line side and the AC vA41I side can be electrically separated and tests or maintenance inspections can be easily performed, which is very efficient.

[Brief explanation of the drawing]

Figures 1fa) to (e) are views showing the first embodiment of the present invention, in which (a) is a plan view, (b) is a side view, (C) is a back view, and (d) is a contact spring. (e) is an enlarged perspective view of the part where the safety device is fixed, FIG. 2 is a diagram showing the circuit configuration in which the safety device is mounted on the communication line, and FIGS.
2 is a diagram showing a second embodiment of the present invention, (a) is a plan view,
(b) is a side view, (C) is a back view, Cd) is an enlarged perspective view of the connection land, and FIG. FIG. 5(a) is a plan view of the protector when connections are made using wiring conductors. (b) shows the protector in the second embodiment when one of the contact spring sets and the terminal on the exchange side is connected by a wiring conductor, (a) is a plan view, and (b) is an enlarged view of the connection land. Perspective view,
FIGS. 6(a) to 6(d) are views showing the third embodiment of the present invention, in which (a) is a plan view, (I) is a side view, (C) is a back view, and (cut) is a security Enlarged perspective view of the part where the element is fixed, No. 7
Figures (a) and (1) show the fourth embodiment of the present invention, in which (a) is a plan view, (b) is a side view, and Figures (a) and (1) are views showing a fourth embodiment of the present invention.
C) and FC) are diagrams showing the fifth embodiment of the present invention;
al is a plan view, (bl is a side view, (C) is a back view, 9th
The figure shows a line configuration in which a protector is mounted on a communication line, and 101a (a) and (g)) show a sixth embodiment of the present invention, (a) is a plan view, and (g) is a diagram showing a sixth embodiment of the present invention. ) is a side view, 1st] is a plan view of the protector showing the seventh embodiment of the present invention, and 12th
The figure is a plan view of a protector showing an eighth embodiment of the present invention, and FIGS. 13 and 14 are views showing a ninth embodiment of the present invention.
FIGS. 15(a), 15(b) and 15(C) show conventional examples. ! ...Insulating plate 2 2a, 2b...2n 3a, 3b-3n...4, 4a, 4b-4n 5.5a, 5b-=5n. 6.6a, 6b...6n 7...Grounding terminal 8...Wiring conductor 9...Connection land 10.10a, 10b=10n --Metal plate 11...
... Telephone 12 ... Subscriber protector 13 ... Telephone office 14 ... Distribution board 15 ... Protector 16 ... Exchange 17 ... Subscriber line contact spring assembly Safety element Grounding conductor 5''... Terminal on the subscriber side Terminal on the exchange side 18... Jatsuba wire 19... Jatsuba wire 20... Earth 21... ... Insulator 22 ... Screws 23a, 23b ... 23n ... Overcurrent protection element 24 ...
...Subscriber side female connector 25...Exchange side female connector 26...Subscriber side terminal male connector 27...
Switch side terminal male connector 30...Case 31...Grounding terminal 32...Modular structure protector 33, 33. ．．
33! ,...33n...submodule 34...
・Metal frame 34a, 34b-34n ・-Opening 41...Through hole 42 of insulating plate...Protector 42a...Subscriber line electrode 42b...Ground electrode 44...・Safety unit/safety instrument patent applicant Nippon Telegraph and Telephone Corporation Agent Patent attorney Toshio Takayama (1 other person) ゛(d) Figure (e) Figure 0 C's---m=- ---■ ゛-□--1---------Figure (a) (b) Figure 9 (b) Figure 911 Figure 12

Claims (4)

[Claims] (1) A plurality of contact spring sets, a safety element, and a grounding conductor are mounted across an insulating plate, one end of each of the contact spring sets forms a subscriber side terminal, and the other end forms a subscriber side terminal. A safety device characterized in that each contact spring set forms an exchange side terminal, and each of the contact spring sets fixes this on one end face of a safety element, and the other end face of the safety element is brought into contact with a grounding conductor. (2) The protector according to claim 1, wherein at least one of the contact spring sets is connected to the safety element, the subscriber side terminal, and the exchange side terminal via a wiring conductor. (3) A protector according to claim 1 or 2, characterized in that an overcurrent protection element is provided between the safety element and the switch side terminal. (4) A protector characterized in that the insulating plates of the protector according to claim 1, 2 or 3 are stacked in two layers and constitute a pair, one above the other.