JPH0746034Y2 - Communication protector - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a communication protector for protecting telephones and other communication devices from abnormal surges. More specifically, this communication protector includes a base and a security cartridge. Related to those that can be separated and combined.

[Conventional technology]

As a communication protector of this type, the applicant's utility model Sho 60-
As shown in Japanese Patent No. 31151, there has been put into practical use a base body in which a safety cartridge having a protector circuit is detachably provided.

The safety cartridge has a case in which the case has an elongated box shape, the extension-side contacts are projected in the longitudinal direction from the tip of the case, and the ground-side contacts are projected on the lower surface.

[Problems to be solved by the device]

According to the above protector structure, the mounting structure and the contacts are complicated and the number of parts is large, so that there is a drawback that the assembly work process takes a long time.

Further, since the case becomes large due to the above structure and the base structure correspondingly becomes large, it is impossible to downsize the protector as a whole.

When the case is to be miniaturized with a rectangular outer shape, there is a drawback in that the contactor is bent and damaged if the case is mounted in an incorrect direction because the contactor has a projection and an arrangement. Therefore, the case and the base must be provided with an indicator such as unevenness, and the indicator must be checked each time before mounting, which is very troublesome.

The present invention has been developed in view of the above circumstances, and an object thereof is to provide a small-sized and high-performance communication protector that has a simple structure and does not cause a mounting error.

[Means for Solving the Problems]

A communication protector according to the present invention for achieving the above object includes a base to which a pair of internal and external communication lines and a ground line are connected, and a base which is detachably attached to the base to connect between the communication lines. And a safety cartridge for communication comprising a three-pole gas discharger type lightning arrester connected to a ground wire and a safety cartridge containing a non-linear resistance element respectively inserted in the communication line, the base being the base. , A pair of extension line terminals and a pair of outer line terminals are symmetrically arranged, an earth terminal is arranged in the middle, and each terminal is composed of a slit terminal.

Further, it is provided with a case for accommodating the safety cartridge teeth and the safety circuit, and a base which is attached to a lower opening of the case and projects downwardly each contactor which is engaged with the slit terminal.

Of the contacts, the contact engaged with the ground terminal is arranged at the center of the base, and one of the contacts engaged with the extension terminal and the contact engaged with the outside terminal is provided. One of them has a substantially U-shaped hold piece on the upper side and has the same shape, and is arranged point-symmetrically with respect to the center of the base so that the hold pieces face each other above the base. The end electrodes of the three-pole gas-filled discharge tube type arrester are held by respective holding pieces, and the ground electrodes thereof are connected to the upper ends of the contacts engaged with the ground terminals, and the non-linear resistance element is connected. Is disposed above the triode gas-filled discharge tube type arrester and is between the other of the contacts engaged with the extension terminal and one of the contacts engaged with the outside terminal, and the extension terminal. Of the contactor engaged in Write and are connected between the other contact to be engaged into the external line terminal.

[Action]

When the safety circuit components are housed in the case and the base is assembled in the opening at the bottom of the case, the contacts are projected from below the base.

In the contactor, the pair of extension lines and the pair of outer lines are symmetrical positions,
Since the earth side contactor is located at the center of the base, it will be constructed symmetrically.

Correspondingly, since the slit terminals are arranged at the symmetrical position and the intermediate position on the base, the contacts of the security cartridge are mounted on the slit terminals of the base without distinguishing between the extension line side and the outside line side. .

Further, since each contactor and the security circuit are provided in point symmetry with respect to the center of the base, the security circuit functions regardless of the orientation of the security cartridge with respect to the base.

[Example of device]

An embodiment of a communication protector according to the present invention will be described with reference to FIGS. 1 to 5.

The communication protector 1 is composed of a base 3 having slit terminals 4 to 6 and a security cartridge 2 mounted on the base 3 to form a security circuit P.

The safety cartridge 2 comprises an insulating case 7 for accommodating a safety circuit and a base 9 assembled from a lower opening 8 of the insulating case 7. From the bottom of the base 9, contacts 10, 10 ',
11, 12, 12 'are projected. Further, screw terminals 13 to 15 that connect the communication lines L and I to the ground wire E are provided on the left and right of the base 3, and the screw terminals 13 to 15 are connected to the slit terminals 4 to 6. .

More specifically, the insulating case 7 is miniaturized to accommodate a three-pole gas-filled discharge tube type arrester 16 as a safety circuit component and the non-linear resistance elements 17 and 17 above it, and the insulating case 7 has a lower opening 8. Projecting pieces 18, 18 having receiving holes 19, 19 are extended from the peripheral edge. A positive temperature coefficient thermistor can be used as the non-linear resistance element 17. Reference numeral 20 in the figure denotes a picking portion on the upper part of the case.

On the other hand, the base 9 has a substantially rectangular plate shape, and is formed at a predetermined interval in the downward insertion holes 21 ... Four corners and the center.
Further, a receiving collar 22 is stretched around the base 9, and the receiving flange 22 is formed with receiving grooves 23, 23 of the projecting pieces 18, 18. Engagement protrusions 24 each having an upper part as a guide surface 25 are projected in the center of the receiving groove, and a tool insertion groove 26 for inserting and releasing a tool after assembly is formed in the lower part of the engagement protrusions 24. . 27 in the figure
Is a projection guide taper surface, and 28 is a slot that intersects with the insertion hole 21.

A pair of contacts on the extension side are provided in the insertion holes 21 at the four corners of the base 9.
10, 10 'and a pair of contacts 12, 12' on the outside wire side are inserted and protruded from the lower part. The contact 11 on the ground side is the base 9
It is inserted and projected in an insertion hole 21 provided at the center of the.

On the upper side of the contacts 10 and 12, there is a substantially U-shaped holding piece 29,2.
9 are integrally formed so as to face each other above the base 9. A retaining rib 30 is bent and formed on the hold piece 29 in the length direction. These contacts 10 and 12 have the same shape as shown in FIGS. 2 and 5, and are arranged point-symmetrically with respect to the center of the base 9 so that the retaining ribs 30 and 30 are on the outside.

The contacts 10 'and 12' are arranged point-symmetrically with respect to the center of the base 9. Further, a substantially U-shaped slit portion 31 can be formed in the upper portion of the earth-side contactor 11. In the figure, 32 is a step portion for regulating the insertion position of the contacts 10'11, 12 ', 33 is a connecting lead portion to the non-linear resistance element 17, 34 is a substantially triangular shape between the hold piece 29 and the contacts 10, 12. It is a connecting part.

Further, the gas-filled discharge arrester 16 is provided with a fail-safe short-circuit plate 43, which is separated from the end electrode 40 by an insulating film 44 that melts by heat.

A relief hole 45 for the rib 42 of the ground electrode 41 is formed in the center of the short-circuit plate 43, and the short circuit plate 43 is mounted in a close contact state as a whole. Reference numeral 46 in the figure denotes a lead wire of the non-linear resistance element 17.

Furthermore, the base 3 has slit terminals 4 to 6 in the center.
A mounting portion 50 having The mounting portion 50 has slit terminals 4 and 4 as a pair of extension terminals, and a pair of outside terminals 6 and 6 are arranged symmetrically with the slit terminals 4 and 4 separated from each other. The ground terminal 5 is arranged in the. In the figure, 51 is a set screw.

In assembling the security cartridge 2, first, the contactors 10, 10 ', 11, 12, 12' are inserted into the insertion holes 21 ... Child 1
At the same time as 0, 10 ', 11, 12, 12' are projected in the same thickness direction, a holding piece 29 ...
And are constructed. Therefore, when the gas-filled discharge tube type arrester 16 is press-fitted between the hold pieces 29, ..., the respective end electrodes 40, 40 are securely held by the hold pieces 29, 29 and the retaining ribs 30, 30. . In this case, the lower end of the rib 42 of the ground electrode 41 is engaged with the slit portion 31.
At this time, the non-linear resistance elements 17, the lead wire 46 of the 17 ...
When the lead parts 33, ... Are fixedly erected by soldering or the like, a safety circuit which is point-symmetric with respect to the central position of the base 9 is constructed.

Next, the insulating case 7 is attached to the base 9 and the security circuit parts.
Is covered from the lower opening 8, the projecting pieces 18, 18 are guided by the projecting piece guiding taper surfaces 27 ... And are engaged in the receiving grooves 23, 23. At this time, the engaging projections 24, 24 of the base 9 are opened by the action of the guide surfaces 25, 25 against the resin elasticity to open the projecting pieces 18, 18.
Engage at 9 and 19.

Along with this, the end face of the lower opening 8 is positioned on the flange 22 to complete the assembly.

Regarding the mounting of the security cartridge 2, since the contacts 10, 10 ', 11, 12, 12' are projected in an arrangement in which the inner side and the outer side are symmetrical and the earth side is located in the middle of them, Extension side terminals 4 and 6 and earth terminal 5 in the same arrangement
It can be attached to the slit terminal that constitutes the.

As shown in the drawing, the internal lines I, the external lines L, and the ground line E are connected to the terminal portions 13 to 15, and even if the internal and external lines are oriented in the opposite directions, they are mounted.

[Effect of device]

As described above, according to the present invention, a pair of inner wire terminals and a pair of outer wire terminals are symmetrically arranged on the base, and the contacts engaged with these terminals and the three-pole gas-filled discharge tube. Since the surge arrester and the safety circuit composed of the non-linear resistance element are provided point-symmetrically with respect to the center of the base of the safety cartridge, the safety cartridge can be mounted in either the normal or reverse direction with respect to the base. The security circuit can be made to function, and accidents due to installation mistakes can be prevented.

In addition, approximately U is provided on the upper side of each of one of the contacts engaged with the extension terminals and one of the contacts engaged with the outside terminals.
-Shaped hold pieces are integrally molded so that they face each other at the top of the base, and each hold piece holds the end electrode of the gas-filled discharge arrester, and a non-linear resistance element is used as the gas-filled discharge arrester. Since it is located above
The security circuits can be densely installed in the case of the security cartridge, and the security cartridge can be downsized.

Further, since the components such as the contacts are arranged point-symmetrically with respect to the center of the base, the structure is simplified and the components having the same shape can be used, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 shows an embodiment of a communication protector according to the present invention. FIG. 1 is a perspective view showing a state of use, FIG. 2 is an exploded perspective view of a security cartridge, and FIG. 3 is III- of FIG. Fig. 4 is a sectional view taken along line III, Fig. 4 is a sectional view taken along line IV-IV in Fig. 2, and Fig. 5 is a plan view showing a state where a triode gas-filled discharge tube type arrester is mounted on a base. DESCRIPTION OF SYMBOLS 1 ... Communication protector, 2 ... Security cartridge, 3 ... Base 4, 5, 6 ... Slit terminal, 7 ... Insulating case, 9 ... Base 10,10 ', 11, 12, 12' ... Contact, 13, 14, 15 ... Terminal part 16 ... Tripolar gas-filled discharge tube type arrester, 17 ... Non-linear resistance element, 18 ... Projection piece, 19 ... Reception hole, 24 ... Engagement projection, 29 ... Hold piece, 30 ... Prevention Ribs, 31 ... Slits, 34 ... Connecting pieces, 40 ... End electrodes, 41 ... Ground electrodes, 43 ... Short circuit plate, 45 ... Relief holes, 50 ... Mounting section.

Claims (1)

[Scope of utility model registration request] 1. A base 3 to which a pair of internal and external communication lines and a ground line are connected, and a three-pole base which is detachably mounted on the base 3 and is connected between the communication lines and to the ground line. A communication protector including a gas cartridge type discharge arrester (16) and a security cartridge (2) containing non-linear resistance elements (17, 17) respectively inserted in a communication line, wherein the base (3) has a pair of extension terminals. 4, 4 and a pair of external wire terminals 6, 6 are symmetrically arranged, a ground terminal 5 is arranged in the middle thereof, and each of the terminals 4, 5, 6 is composed of a slit terminal, and the security cartridge 2 has a security circuit. Case 7 for accommodating the case 7 and respective contacts 10, 10 ', 11, 1 assembled in the lower opening of the case 7 and engaged with the slit terminals 4, 5, 6
A base 9 formed by projecting 2, 12 'downward, and the contact 11 engaged with the ground terminal 5 among the contacts 10, 10', 11, 12, 12 'is the base. 9, one of the contacts 10 engaged with the extension terminal 4 and one of the contacts 12 engaged with the outside terminal 6 are respectively provided with substantially U-shaped holding pieces 29, 29. The holding pieces 29, 29, which have the same shape on the side, are arranged symmetrically with respect to the center of the base 9 so that the holding pieces 29, 29 face each other above the base 9, End electrode 40, 40 of discharge tube type arrester 16
Is held by the respective holding pieces 29, 29, and the ground electrode 41 thereof is engaged with the ground terminal 5.
The non-linear resistance elements 17, 17 are connected to the upper end of 11, and are arranged above the three-pole gas-filled discharge tube type arrester 16 and the extension terminal 4
Between the other 10 'of the contacts engaged with the outside wire terminal 6 and one of the contacts 12 engaged with the outside wire terminal 6, and one of the contacts 10 engaged with the inside wire terminal 4 and the outside wire terminal 6 A communication protector characterized in that it is connected between the other contact 12 'and the other contact 12'.