JPH0448639Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the structure of a three-pole lightning arrester used in a protector for telephone subscribers, which has already been put into practical use. [Prior art] The protector for telephone subscribers currently in practical use uses two two-pole arresters, but with the computerization of household equipment, it has become necessary to use three-pole arresters. . Conventional bipolar lightning arresters are constructed by placing a line electrode plate and a ground electrode plate facing each other on the upper and lower surfaces of a rectangular insulating block, which are attached independently to each line of a communication line. A polar type lightning arrester is a gas-filled three-pole type lightning arrester installed inside an insulating block, and two communication lines, which are one communication line, are brought into contact with two line electrode plates, and the earth electrode plate is grounded. must be an integrated lightning arrester. When interference waves are applied to a communication line, a telephone subscriber protector must prevent these interference waves from entering the premises by discharging them to the ground or cutting them off. Even if the fuse tube installed between the outside line and the extension line is sufficiently isolated, it is meaningless if the insulation voltage on the outside line side is poor. For this reason, in order to improve the withstand voltage between the outside wires, which has decreased due to miniaturization, when the cover is placed on the cover, the partition walls installed on the cover enter between the outside wires, and the air discharge between the outside wires is caused. The structure was designed to prevent leaks. Due to the partition wall provided on this cover, it was difficult to easily make a three-pole lightning arrester, but the structure of Japanese Utility Model Application No. 128230/1983 proposed by the present applicant was proposed and put into practical use. That is, the three-pole lightning arrester with the above structure has a pair of insulating blocks in which a gas-filled three-pole lightning arrester is built in on one side, and the upper surface of one side of the insulating block has a main electrode connected to one of the main electrodes of the lightning arrester. The line electrode plate on one side to be connected is attached from above, and the line electrode plate on the other side, which is connected to the other main electrode of the lightning arrester via a connecting plate, is mounted on the upper surface of the other side of the insulating block via a partition wall. It was installed from above in a spaced state, and a ground electrode plate connected to the intermediate electrode of the lightning arrester element was installed from below on the bottom surface of the insulating block. The connecting plate has a U-shape with a cut groove formed in the upper part of the U-shaped connecting portion, and is assembled by inserting the groove from the rear outside of the pair of insulating blocks. A notched recess for mounting in the protector is formed on the rear outer surface of the insulating block, and a connecting plate is mounted to cover this notched recess.
Therefore, the cut groove of the connecting plate is formed in accordance with the cut recess so as not to interfere with the installation in the protector. [Technical problem to be solved by the invention] However, the above structure causes the following problems. (a) It has been pointed out that because the connecting plate has cut grooves, its resistance increases against interference waves with high frequency components such as lightning shock waves, which has a negative impact on lightning protection performance. (b) Since the connecting plate is attached to the rear outer surface of the insulating block, it has the disadvantage that dust and moisture tend to adhere to it, resulting in deterioration of the insulation and withstand voltage. Moreover, since the line electrode plate and the ground contact plate are inserted and mounted from different cross directions, the assembly work is troublesome and difficult to automate. (c) Furthermore, since the cut grooves of the connecting plate were cut from one side, the balance was poor and the plate was easily deformed during assembly. (d) The connecting plates were visible from the outside, which was not aesthetically pleasing, and there was a possibility that they would fall out due to aging. Therefore, the present invention was completed as a result of further experiments in order to eliminate the above-mentioned drawbacks, and is a three-pole lightning arrester for use in a telephone subscriber protector that has improved lightning protection performance and is easy to assemble. Its purpose is to provide the following. [Structure of the invention] In order to achieve the above object, the invention consists of a pair of substantially rectangular box-shaped insulating blocks arranged side by side in a bifurcated manner through a joint, and a gas-filled three insulating blocks on one side of the insulating blocks. A polar lightning arrester is built in, and a line electrode plate on one side connected to one main electrode of the gas-filled three-pole lightning arrester is attached from above to the upper surface of one side of the insulating block. On the upper surface of the other side, the other side line electrode plate, which is connected to the other main electrode of the gas-filled three-pole lightning arrester element via a connecting plate, is attached from above with a separation between the two sides, and the above-mentioned insulation In a three-pole lightning arrester used for a telephone subscriber protector, the earth electrode plate connected to the intermediate electrode of the gas-filled three-pole lightning arrester element is attached from below to the bottom surface of the block. A communication groove is formed on the rear side of the lower surface of the connecting portion, and a communication groove is formed inside the connecting portion to communicate the inside of the pair of insulating blocks. It is characterized in that it has a U-shape with a section and is fitted into the communication groove from below. [Operation of the invention] A pair of line electrode plates are attached to the upper surface of the insulating block. A connecting plate is attached from below to the communication groove of the connecting part in the middle of the insulating block, and a gas-filled three-pole lightning arrester element is attached to one side, and then connected to the intermediate electrode of the lightning arrester element. The ground electrode plate is attached and assembled. Therefore, the main electrode of the gas-filled three-pole lightning arrester element is connected to a pair of line electrode plates on the top surface, and the intermediate electrode is connected to the ground electrode plate on the bottom surface of the insulating block.
The connecting plate is installed inside. [Example of the invention] Fig. 1 is an overall perspective view of a three-pole lightning arrester used in a telephone subscriber protector according to the invention, Fig. 2 is an exploded perspective view of the same, and Fig. 3 is a view from below. It is a partially cutaway perspective view. The three-pole lightning arrester comprises a pair of insulating blocks 1 and 2, and one of the insulating blocks 1 has a button-shaped gas-filled discharge tube type three-pole lightning arrester element 15 built therein. The above-mentioned insulating blocks 1 and 2 are connected to the connecting part 3 on the rear side of the bottom.
They are integrally molded in parallel in a bifurcated state separated by
Grooves 5, 5 are formed on the upper surfaces of the insulating blocks 1, 2 to form partition walls 4, 4, and line electrode plates 20a, 20b are mounted in the grooves 5, 5. The upper surfaces of the insulating blocks 1, 2 have an upper surface and a slightly inclined surface lower than the upper surface, and the upper and lower grooves 5, 5 are provided with engagement holes 6, 7, 7 on both sides, and the lower The engagement hole 8 is passed through in the shape of a clock hole. A notched recess 28 is formed on the rear outer surface of the insulating blocks 1, 2, that is, above the joint portion 3, for mounting within the protector. Further, the insulating blocks 1 and 2 have a recessed portion opening at the bottom, and the earth electrode plate 40 is mounted in this recessed portion. A communication groove 9 for communicating the two recesses and accommodating the connecting plate 30 is formed in the bottom part located at the coupling part 3, and a storage part 10 for the lightning arrester element 15 is formed in the recess on one side. Further, in the figure, reference numerals 11 and 12 are engagement step portions located before and after the grooves 5, 5, and reference numeral 13 is an engagement receiving groove on the lower outer side of one side of the insulating block 1. The line electrode plate 20a has an elongated step-shaped contact surface portion 21 that engages in the upper and lower portions of the groove portion 5. A contact piece 22a is bent and extended downward from the one side, and a contact portion 22a is bent and extended downward from both lower sides and the front side. The insert pieces 23, 23, 24 are bent downward. The contact piece 22a has a contact portion 2.
7a is curved, and retaining portions 25, 26 are protruded from the tips of the engaging pieces 23, 23, 24. The line electrode plate 20b is also formed similarly to the line electrode plate 20a . Further, the connecting plate 30 has a U-shape as a whole, and includes a central board 31, clamping pieces 32a, 32b bent on both sides thereof, and clamping pieces 32a, 32b.
The contact piece portions 33a and 33b are extended from the contact piece portions 33a and 33b. Furthermore, the ground electrode plate 40 is connected to the substrate 4.
1 and 42 have a bifurcated shape as a whole, and the substrates 41,
Engagement pieces 43 and 44 are raised at the front and rear of 42, respectively, and claw portions 45 and 46 are provided at the tips of the engagement pieces 43 and 44, respectively.
is made by folding. Pressing pieces 47, 47 of the lightning arrester element 15 are formed by punching on one side of the substrate portion 41 in a state having spring properties. In the figure, 48 is a recess. According to the above configuration, a pair of line electrode plates 20a, 20 are placed on the upper surfaces of the insulating blocks 1, 2 from above and below.
Attach b. The engagement piece 24 is engaged from the large diameter part of the engagement hole 8 and moved to the narrow hole part, thereby locking the engagement piece 24 into the retaining part 26.
is in the engaged state. Next, when the engaging pieces 23, 23 are engaged in the engaging holes 7, 7, they are engaged in the width direction by the retaining portion 25, and at the same time, the contact pieces 22a, 22b are inserted into the engaging holes 7, 7. 6, 6 will be involved. The contact piece 22a on one side is located outside the storage section 10 . Next, the communication groove 9 is opened from below the insulating blocks 1 and 2.
Push the connecting plate 30 into the The connecting plate 30 is firmly attached with the base plate 31 being inserted into the communication groove 9 while being held between the left and right holding pieces 32a and 32b . Along with this, the contact piece part 33a is located on the connection side of the storage section 10, and the contact piece part 33b is located in the engagement hole 6 of the insulating block 2 on the other side. It becomes connected to 27b . Since the connecting plate 30 is attached from below, it does not cover the notch recess 28 above the joint portion 3, so its shape is not affected by the notch recess 28 at all. If the lightning arrester element 15 is installed in the storage part 10 in such a state, the pair of main electrodes will be connected to the contact piece 22a and the contact piece part 3.
For example, the claw portions 46 of the front engaging pieces 44, 44 are engaged with the engaging step portions 12, 12. The substrates 41 and 4 are formed using such engaging portions as hinges.
2 approaches the opening side and presses it, the claws 45, 45 of the rear engagement pieces 43, 43 engage the engagement steps 11,
11 and is installed. Along with this, the pressing pieces 47, 47 press the intermediate electrode of the lightning arrester element 15 in a three-point supported state, and are connected. In this case, it is possible to have a structure in which a contact block 16 is attached to the intermediate electrode 15a of the lightning arrester element to obtain good contact with the pressing pieces 47, 47. In the above embodiment, the connecting plate 30 is provided with a bent protrusion at the U-shaped tip, or the connecting plate 30 is provided with a bent protrusion at the tip of the U-shape, or
By providing a structure such as providing a concave and convex portion that fits into the electrode, it is possible to prevent the electrode from coming out naturally and coming into contact with the ground electrode plate 40 and causing a short circuit. Further, in the case of automation, it is possible to assemble the line electrode plates 20a, 20b , the insulating blocks 1, 2, the connecting plate 30, the lightning arrester 15, and the ground electrode plate 40 from above in this order, for example, with the structure upside down. [Effects of the invention] According to the invention, since the connecting plate is attached to the communication groove from below, the connecting plate does not cover the notch recess above the joint, so the notch in the connecting plate, which has been a problem in the past, can be avoided. Even though the groove can be eliminated, the space between the partition wall of the cover and the part separated therefrom can be made sufficiently large, and the withstand pressure can be increased. In addition, since the cross-sectional area of the connecting plate can be made sufficiently large, electrical loss between the line electrode plate and the three-pole lightning arrester can be minimized, and since the connecting plate is housed inside the main body, it is dust-proof, moisture-proof, and aesthetically pleasing. , is also preferable in terms of preventing a decrease in insulation and withstand voltage. Furthermore, assembly can be easily performed from one direction.

[Brief explanation of the drawing]

The drawings show an embodiment of a three-pole lightning arrester used in a telephone subscriber protector according to the present invention, in which Fig. 1 is an overall perspective view of the same, Fig. 2 is an exploded perspective view of the same, and Fig. 3 is a view from below. FIG. 1, 2...Insulating block, 3...Joining part, 4...
...Partition wall, 5...Groove, 6-8...Engagement hole, 9...
Communication groove, 15...Gas-filled triode lightning arrester element, 20
a, 20b...Line electrode plate, 22a, 22b ...
Contact piece, 30...Connection plate, 31...Substrate part, 32
a, 32b... Holding piece part, 33a, 33b ... Contact piece part, 40... Earth electrode plate, 47... Pressing piece.

Claims (1)

[Claims for Utility Model Registration] A pair of substantially rectangular box-shaped insulating blocks are arranged side by side in a bifurcated manner through a joint, and a gas-filled triode lightning arrester is built into one side of these insulating blocks. One side of the line electrode plate connected to one of the main electrodes of the gas-filled three-pole lightning arrester element is attached from above to the upper surface of one side of the insulating block, and the above-mentioned gas The line electrode plate on the other side, which is connected to the other main electrode of the three-pole type lightning arrester through a connecting plate, is installed from above while being separated from the plate through the partition wall, and the gas inlet plate is attached to the bottom surface of the insulating block. In a three-pole lightning arrester for use in a telephone subscriber protector, the earth electrode plate connected to the intermediate electrode of the three-pole lightning arrester element is attached from below, the coupling portion being formed on the rear side of the lower surface of the insulating block; A communication groove communicating between the pair of insulating blocks is formed inside the coupling portion, and the connecting plate has a U-shape including a central substrate portion and a pair of clamping pieces bent on both sides thereof. 1. A three-pole lightning arrester for use in a telephone subscriber protector, characterized in that the surge arrester is mounted in the communication groove from below.