JP4605986B2 - Ground bus and protective plug for connecting or separating blocks in telecommunications and data technology - Google Patents

Description

[0001]
The present invention relates to ground buses and protective plugs for connection or isolation blocks in telecommunications and data technology.
[0002]
German Patent 38 13 889 C1 discloses a connecting or separating block for telecommunications technology with at least one insertable protective plug having a housing, in the housing of this protective plug, At least one surge arrester is provided, and each surge arrester is connected to one terminal by a strip-shaped conductive contact member provided in the housing and having an insertion tongue-like piece after insertion of the protective plug, and a ground fixed to the mounting lug It is electrically connected to the other terminal by the bus, and the ground bus is provided in parallel to the longitudinal side of the connecting or separating block. This ground bus has an insertion tongue for each protective plug. Parallel to the direction of insertion into the connecting or separating block, the protective plug housing has an insertion channel into which the corresponding ground bus insertion tongue can be introduced, so that it is provided in the protection plug. Conductive connection with all surge arresters. A part of the conductive contact member provided in the housing is loosely arranged in the guide groove and acts to contact the surge arrester. The two parts of the side contact member provided in the housing are designed differently. One conductive contact member has a U-shaped design, and the other has an S-shaped design, and the angled ends of these conductive contact members are accommodated in guide grooves extending in parallel. These two ends of the conductive contact member are further bent at right angles to the front of the opening to form a short-circuit link. In the rest position, the end of the shorting link engages the insertion channel. Since some of the side contact members provided in the housing are elastically prestressed, they are press-fitted into the guide groove only after the surge arrester is inserted. The surge arrester is inserted into the protective plug from the front surface of the opening, and is elastically pressure-bonded to one terminal of the meltable pellet fitted between the conductive contact member and the surge arrester. On the other terminal side, the surge arrester is held by an elastic locking hook provided on the side surface in the longitudinal direction of the housing as an opposing contact portion, and is consequently fixed in the housing of the protective plug. Thereafter, the insertion tongue of the ground bus presses the locking hook supporting the surge arrester on one side to establish a connection with one terminal of the surge arrester, and as a result is grounded. This known protective plug has the disadvantage that it is complex in structure and difficult to produce automatically.
[0003]
Therefore, the present invention is more structurally simple even when the tolerances are relatively large, and also provides protection for connection or isolation blocks that ensure a reliable electrical connection between the ground bus and the protective plug. Get plug and ground bus.
[0004]
The technical problem is solved by a device having the features described in claims 1-8. The dependent claims provide further advantageous improvements of the invention.
[0005]
For this purpose, the insertion tongue of the ground bus is configured elastically, whereas the corresponding ground contact in the protective plug is configured mechanically rigid in the protective plug housing. In this case, the geometry of the elastic insertion tongue is adapted to the geometry of the ground contact. The rigid configuration of the ground contact in the protective plug makes it easy to assemble and automate the production of the protective plug, while at the same time the ground contact can be constructed as a robust part, so that a large current / surge current Can be connected to the ground, and a simple geometric shape can be used from the viewpoint of production engineering. The elastic design of the insertion tongue can be achieved in a simple manner from a production engineering point of view. The necessary connection force is generated without transmitting any force to the inside of the protective plug. The generated stress is mainly absorbed by the elastic material that can withstand the severe use of the ground bus.
[0006]
In the preferred embodiment, the protective plug functional element and ground contact are provided on the printed circuit board, thereby eliminating the need to support the ground contact itself within the protective plug housing. As a result, the effective connection force is not adversely affected by varying the housing geometric shape or by aging the plastic used in the protective plug housing. The ground contact is preferably disposed on the back side of the printed circuit board and configured as a robust contact.
[0007]
The corresponding insertion tongue of the ground bus is preferably designed as a fork-like contact that clamps elastically and connects to the ground contact from the side.
[0008]
In order to obtain the best possible connection, the geometry of the insertion tongue and the ground contact is adapted to each other. In a preferred example, the ground contact is constructed as a solid, rectangular piece, and the fork contact is constructed in the form of an arc segment at the point of contact with the ground contact. On the other hand, when the ground contact is in a spherical or cylindrical shape, the contact point of the fork-shaped contact is planar.
[0009]
In another preferred embodiment, printed circuit boards of different lengths and different components are used in the same protective plug housing by providing an additional support surface in the housing for the printed circuit board. Can do.
[0010]
The housing of the protective plug is preferably divided into two parts in the longitudinal direction and these two parts are locked together. By dividing in the longitudinal direction, no force acts in the connecting direction of the housing part when the protective plug is extended or pulled.
[0011]
The first housing portion defines a relatively large installation area that substantially accommodates functional elements disposed on the front side of the printed circuit board, whereas the second housing portion accommodates a ground contact. Is preferably divided here. Accordingly, an insertion channel for the insertion tongue of the ground bus is also provided in the second housing part. This asymmetrical division of the housing part has the effect of making the construction in the connecting or separating block very compact, so that the housing of the protective plug does not impede the accessibility of the adjacent contacts.
[0012]
In another preferred example, at least one measurement or separation point is provided in the protective plug housing, which is provided on the underside of the printed circuit board and externally on the opposite side of the insertion part. It is preferable to be able to connect to. Each core is preferably assigned to a measurement or separation point, but both measurement or separation points can be connected simultaneously through a test plug.
[0013]
In the following, preferred embodiments of the present invention will be described in more detail.
FIG. 1 is an exploded view of a system including a connection or separation block 1, a mounting tank 2, a ground bus 3, and a protective plug 4. The connecting or separating block 1 comprises two clamp-locking elements 5 which are locked in the opening 6 of the mounting tub 2 so that the front of the opening 6 The portion of the mounting tub 2 in the electrical connection to the ground contact 7 of the connection or separation block 1 is electrically connected.
[0014]
The ground bus 3 comprises a base 8 having a bead 9 arranged parallel to the longitudinal direction of the connecting or separating block 1. The base 8 is provided with ten insertion tongues 10, and the insertion tongues 10 are arranged at regular intervals so as to be substantially orthogonal to the longitudinal axis of the base 8. The insertion tongue-shaped piece 10 is elastically configured as a fork-shaped contact. This fork-shaped contact will be described in detail later with reference to FIG. Further, two U-shaped bent portions 11 are provided on the side of the ground bus 3, and the lower legs of the U-shaped bent portion 11 are connected to the ground contact 7 of the connection or isolation block 1, respectively. Another fork-like contact 12 is provided that can be electrically connected. As a result, the ground bus 3 can be grounded via the ground contact 7 and the mounting tank 2.
[0015]
For example, the protective plug 4 provided with a surge protection element includes two housing parts 13 and 14, a printed circuit board having functional elements is provided in the housing part, and a part of the printed circuit board is accommodated in the housing. Projecting outwardly to form an insertion portion 15. This insertion part 15 can be inserted into a contact (not shown) of the connection or separation block 1. This contact is assigned to two insulation displacement contacts on the cable and jumper side of the connection or isolation block 1, respectively. By inserting the insertion portion 15 into this contact, the insulated moving contact is electrically connected to the functional element on the printed circuit board. By inserting the insertion portion 15, the engaging insertion tongue 10 is simultaneously inserted into the insertion channel of the protective plug 4 and connected to the ground contact in the protective plug 4, which will be described later with reference to FIG. 2. To do. In this case, since the connection of the ground contact of the protective plug 4 occurs before the functional element is connected to the insulated moving contact, the functional element is always reliably grounded.
[0016]
Shown in perspective in FIG. 2 is a portion of the ground bus 3 with the protective plug 4 attached, with a portion of the housing portion 14 cut away to better illustrate the contact action. The insertion tongue 10 configured as a fork-like contact has a downwardly curved portion 16 so that the upper surface of the housing part 14 terminates in substantially the same plane as the base 8 of the ground bus 3 and is thereby adjacent. Do not hinder wiring in connected or isolated blocks. Furthermore, the insertion tongue-shaped piece 10 has an upward curved portion 17, which increases the elastic action of the insertion tongue-shaped piece 10. A contact point 18 is provided on the side of the insertion tongue 10 remote from the base 8, and this contact point 18 makes electrical contact with the ground contact 19 on the printed circuit board in the protective plug 4. The contact point 18 is formed in the form of an inward arc segment. When the insertion tongue 10 is inserted into the insertion channel of the protective plug 4, the two contact points 18 are elastically pressed against the flat side wall of the ground contact 19, resulting in a mechanically and electrically stable contact. The ground contact 19 is mechanically rigidly clamped on the printed circuit board. In this embodiment, the elastically designed contact points 18 can very easily compensate for the mechanical tolerances of the ground contact 19 or the printed circuit board 25 or the housing of the protective plug 4 and are also reliable electrical. Ensure contact. As is apparent from the figure, the quality of the electrical contact between the contact point 18 and the contact contact 19 can be improved by matching these geometries to each other. For example, when the ground contact 19 is configured as an upright cylindrical pin, the contact point 18 is preferably configured as a flat plane.
[0017]
For reasons of mechanical stability, the first housing portion 13 that forms a relatively large installation space is formed with beads 20 and 21 on the side and rear surfaces thereof. Furthermore, the housing part 13 has openings 22, 23 in which the complementary locking lugs of the second housing part 14 can be locked. Furthermore, there is a slit 24 on the rear face of the protective plug 4 through which the measurement or test plug can be connected to an optional separation or measurement point on the printed circuit board.
[0018]
FIG. 3 shows the protective plug 4 without the second housing part 14. The printed circuit board 25 is rested on the support of the first housing part 13, and the ground contact 19 is mechanically and firmly provided on the lower surface side of the printed circuit board 25. The ground contact 19 is attached to a through-hole passing through the printed circuit board 25, or through an electrically plated hole at a point on the upper side, and is connected to a ground lead of a functional element such as a surge arrester provided on the upper side. Electrically connect to A position fixing portion 26 is formed in the first housing portion 13, the position fixing portion 26 is passed through the printed circuit board 25, and the printed circuit board 25 is fixed to the housing portion 13.
[0019]
FIG. 4 shows a relatively long printed circuit board 25, and two separation contacts 27 that can be connected from the outside through the slits 24 are further provided on the printed circuit board 25.
[0020]
5, the protective plug 4 of FIG. 4 with the second housing part 14 is shown in cross-section. The protective plug 4 comprises a first housing part 13, a second housing part 14 and a printed circuit board 25. In this embodiment, the printed circuit board 25 is rested on the support surface 28 of the first housing part 13. A surge arrester 29, two PTC thermistors 30, and two diodes 31 are provided on the upper side surface of the printed circuit board 25, thereby forming a staged protection device. A ground contact 19 and two separation contacts 27 are provided on the lower surface of the printed circuit board 25. The ground contact 19 penetrates the printed circuit board 25 and is electrically connected to the center tap 32 of the surge arrester 29. The ground contact 19 can be accessed from the outside through the opening 33. The separation contact 27 is securely connected or tightened to the printed circuit board 25 in the region of the support surface 28. A crank-shaped offset portion is formed in the separation contact 27 toward the rear, and is electrically connected to a functional element on the upper surface of the printed circuit board 25 through the electrical contact pad 34 of the printed circuit board 25. In this case, since the separation contact 27 is electrically connected to the back surface of the functional element, the separation contact 27 is protected against a surge. An insertion channel 35 is provided on the end face of the second housing part 14, through which the insertion tongue of the ground bus can be inserted into the protective plug 4. The printed circuit board 25 has a plurality of openings, through which the position fixing part 26 of the first housing part 13 and the various locking means 36 penetrate, and form a locking connection with the second housing part 14. The portions of the printed circuit board 25 that protrude outward from the first and second housing portions 13 and 14 form the insertion portion 15. As is apparent from the figure, all the energized portions are insulated from the outside by the housing portions 13 and 14.
[0021]
6 and 7 show perspective views of the protective plug 4 in a fully assembled state.
[Brief description of the drawings]
FIG. 1 is an exploded view of a connection or separation block comprising a mounting tub, a ground bus, and a protective plug.
FIG. 2 is a diagram showing a part of a ground bus with a protective plug in contact.
FIG. 3 is a perspective view from below of a protective plug with a short printed circuit board and without a second housing part.
FIG. 4 is a perspective view from below of a protective plug with a long printed circuit board and two separation contacts without a second housing part.
5 is a cross-sectional view of the protective plug of FIG. 4 with a second housing portion.
FIG. 6 is a perspective view of a completed protective plug.
FIG. 7 is a perspective view of the completed protective plug from below.

Claims (15)

A ground bus for connection or separation blocks in telecommunications and data technology, with an insertion tongue that can be inserted into the insertion channel of the protective plug, based on the number of double core wires to be wired And a ground bus comprising at least one ground contact, the ground contact capable of grounding the ground bus through the ground contact,
A grounding bus characterized in that the insertion tongue (10) has an elastic configuration.   The ground bus according to claim 1, wherein the insertion tongue-like piece (10) is configured as a fork-shaped contact.   The grounding bus according to claim 1 or 2, wherein a downwardly curved portion (16) is formed in the insertion tongue piece (10). The ground bus according to any one of claims 1 to 3, wherein the curved portion (17) of the insertion tongue (10) is angled upward on the side away from the base (8). The grounding path according to any one of claims 1 to 4, wherein the contact point (18) of the insertion tongue (10) is configured in a planar shape or in the form of an arc segment.   The ground bus according to any one of claims 1 to 5, wherein the ground contact (12) is configured as a fork-shaped contact.   The ground bus according to claim 6, wherein the fork-like contact (12) can be connected to a ground contact (7) of a connection or separation block (1). A protective plug for a ground bus according to any one of claims 1 to 7 for connection or isolation blocks in telecommunications and data technology, comprising a housing with functional elements arranged therein, and grounding In a protective plug having an insertion channel for accommodating an insertion tongue of a bus, at least one ground contact (19) that can be electrically connected to the insertion tongue in a fitted state, and an insertion portion,
A protective plug characterized in that the ground contact (19) is mechanically rigidly mounted in the housing of the protective plug.   The protective plug according to claim 8, wherein the functional element (29-31) and the ground contact (19) are provided on the printed circuit board (25).   The protective plug according to claim 9, wherein the functional element (29-31) is provided on an upper side surface of the printed circuit board (25), and the ground contact (19) is provided on a lower side surface of the printed circuit board (25). .   11. The protective plug according to any one of claims 8 to 10, wherein the ground contact (19) is formed as a rectangular piece or a cylindrical shape in a contact region.   The protective plug according to any one of claims 9 to 11, wherein the support point (28) for the printed circuit board (25) is located inside and on the housing.   A first housing part (13) which mainly houses the functional element parts (29-31) and defines a relatively large installation area, and an insertion channel (35) are formed; The protective plug according to any one of claims 10 to 12, comprising a second housing part (14) for receiving a ground contact (19) provided on a lower surface of the printed circuit board (25).   The protective plug according to claim 13, wherein the two housing parts (13, 14) can be locked to each other.   9. At least one measurement and separation point (27) is provided in the housing so that the measurement and separation point (27) can be accessed from the outside on the opposite side of the insert (15). The protective plug according to any one of 14.

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