EP2353040A1

EP2353040A1 - Security system for optical plug-in connector

Info

Publication number: EP2353040A1
Application number: EP09767926A
Authority: EP
Inventors: Oliver Eckstein; Daniel Eigenmann
Original assignee: Reichle and De Massari AG
Current assignee: Reichle and De Massari AG
Priority date: 2008-12-01
Filing date: 2009-11-27
Publication date: 2011-08-10
Also published as: CN102246075A; US20110317976A1; WO2010063130A1; EP2624033A1; JP2012510638A; CA2744098A1; AU2009322051A1; AU2009322051A2; KR20110103984A; CH700064A1; RU2011126625A

Abstract

A securing apparatus is provided, which in addition to a duplex plug comprises a clip for forming a duplex plug from two simplex plugs and a removable actuating protector (21). Said protector has a dimensionally rigid covering section (21.1) and covers the trigger (13.1) toward the proximal side. The actuating protector additionally has a guide section (21.2), which for fastening purposes protrudes through an opening in the trigger toward the distal side of the duplex plug. Due to the covering section and/or the guide section blocking a movement of the trigger, the trigger cannot be actuated without tools. The guide section is blocked by a detent mechanism, thereby preventing removal of the actuating protector (21). In order to release the detent mechanism, an unlocking tool (22) having a characteristic actuating section must be inserted in the actuating protector. The unlocking tool is preferably characteristically shaped, matched to the opening in the actuating protector with respect to the dimensioning thereof, and is likewise part of the securing apparatus. In principle, as an alternative, it would also be conceivable to design the actuator protection such that a commercially available tool can be used, such as a paper clip.

Description

SAFETY SYSTEM FOR OPTICAL CONNECTORS

The invention relates to the field of optical connectors and in particular safety systems for optical connectors.

Among the optical connectors, "LC" type connectors are gaining in popularity, especially due to the small form factor, but this small form factor has its price.The components of LC connectors are very small in size with minimal wall thicknesses, resulting, firstly, in manufacturing challenges. Secondly, there is little scope for adding elements with additional functionalities, for example security elements, but these are becoming more and more important since the radiation powers transmitted via optical fiber connections are now very large and necessitate security measures, both for personal security and liability reasons and for reasons the operational safety.

It is therefore an object of the invention to form an optical connector system such that in comparison to the prior art additional security features are present without compromising the requirements on the form factor. In particular, an LC duplex adapter or an LC duplex adapter part and an LC duplex connector are to be provided, which have additional security features. There is also one Object of the invention to provide a manufacturing technology favorable LC duplex adapter.

These objects are achieved by the invention as defined in the claims.

According to a first aspect of the invention, there is a duplex adapter or a duplex adapter part (which may also serve to form a receptacle) for a duplex type "LC" or other similar type with a small size A duplex adapter has two pairs of aligned plug openings, into each of which an LC duplex plug inserted from opposite sides is insertable, such that in the plugs guided A corresponding adapter part has two adjacent plug openings and is, for example, provided to form an adapter together with another, identical adapter part, or possibly also with other components a receptacle for coupling to a transmitter, receiver To form transceivers or repeaters between the neighbors the lying plug openings is arranged as known per se, a partition. The adapter or the adapter part has an adapter housing and on at least one side of a frame attached to the outside of the adapter housing, which surrounds both plug openings of the respective side and has a between the plug openings extending portion. The framework provides additional security by performing one or more of the following functions: Mechanical Coding: The frame may have characteristic features (eg protrusions and / or depressions or the like protruding laterally into the plug opening or protrusions or the like) which cause corresponding features of the plug (in particular of a clip joining the duplex plug) to cause one of the application suitable plug is inserted, but not other plugs.

Color Coding: The frame may have a different color from the case, which is characteristic of the application.

Even though the principle of mechanical and / or color coding per se has long been known (for example from EP 0 616 236), aspects of the invention with the exchangeable, cost-effective coding frames offer a very good solution for the

Encoding. In contrast to solutions in which the encoding is effected by the adapter or the adapter part or the plug as a whole, the solution proposed here is clearly preferable also in terms of stocks and costs, but there must not be inventories of adapters of different codes, but it is enough for a type of adapter.

Protective cover: A particularly advantageous application of the frame is to hold a radiation protection flap ("laser protection flap") .In an adapter part or adapter type LC, mounting a protective flap is virtually impossible for reasons of space, but for reasons of safety this is more and more desirable Adapter or adapter part according to embodiments of the invention is now the laser damper as elastic, around a proximal end edge of the partition folded and in the plug openings the optical fiber axes covering protruding, metallic sheet, for example. From spring steel, formed, which is held by the frame. - A -

The sheet may, for example, have in cross-section the shape of a "V" with arms bent towards the outside in a direction perpendicular to one direction, i.e. it may form two arcuate sheet sections whose convex sides project against each other.

The fact that according to the approach proposed here, the protective flap is held by the frame, there are significant advantages:

Space: The protective flap can be solidly fixed that additional (non-existent) space would be claimed. The protective flap must only run between the partition and the middle part (the gutter) of the frame, preferably with both sides along the partition of the

Partition end edge inwardly (i.e., in the distal direction) extending portions.

Fabrication: The protective flap can be made as a suitably shaped sheet metal, which can be made separately from the housing, i. For example, no sections of the sheet must be bent around elements of the housing. The protective flap is inexpensive to produce and even retrofitted.

Safety: The protective flap - which is present on at least one side, preferably on both sides (the incoming and the outgoing side) - provides reliable personal safety, even in case of incorrect manipulation such as the erroneous unplugging a plug during operation. The frame and / or possibly the laser protection flap can only be present on one side on the adapter / adapter part, or it can be attached on both sides (usually on the patch side).

The terms "axial", "proximal", "distal" used in this text are to be interpreted as referring to the plug-in connection, the axis corresponding to the optical axis along which the light is passed when plugged in and in operation "Axial" means "parallel to the axis." "Lateral" or "lateral" refers to non-axial directions, and such a connector is often defined as an optical plane, which is the plane perpendicular to the axis a plug-plug connection in the operating state in the middle between the two ferrules of the plug is, so to speak, where the guided light is passed from one plug to another. "Distal" refers to the positions "front" on the plug and "inside" in the plug opening, so if necessary "to the optical plane". "Proximal" is called if necessary "away from the optical plane", ie "behind" on the plug and "outside" The terms "top" and "bottom" are sometimes used in this text. They refer to the orientation of an LC plug / adapter / receptacle, in which the actuating pawl is on top, they are of course not to interpret so that only systems with certain orientations are protected in the installation; rather, the invention does not depend on the orientation as ultimately chosen for operation.

A duplex plug, for example, for an LC connector, for example. For an adapter / a receptacle of the type described above, as is well known in addition to two release pawls (one for each of the two connector parts of the duplex connector) also has a common Trigger on. If the duplex plug is made of two standard simplex plugs, which are connected to each other by a clip ("Duplex Yoke" yoke), the clip has one correspondingly molded in one piece with the clip trigger. This is formed as projecting away from the plug axis in the distal direction away, at the distal end of both unlocking pawls superior flap, see, for example, also US 7,413,351, EP 0 788 002 and US 6,461,054.

According to a further aspect of the invention, a securing device is provided which, in addition to the duplex plug as a whole or the clip, also has a removable actuation protection. This has a dimensionally stable covering section and covers the trigger from the proximal side. The actuation guard also has a guide portion which projects for attachment through an opening in the trigger to the distal side of the duplex connector. Due to the covering and / or the movement of the trigger blocking guide part of the trigger can not be operated without tools. Likewise, a direct tool-free operation of the locking blades is prevented. The guide part is blocked by a latching mechanism, so that removal of the actuation protection is prevented. To release the latching mechanism, an unlocking tool having a characteristic actuating portion must be inserted into the actuation guard. The unlocking tool is preferably shaped in a characteristic manner, matched in its dimensioning to the opening in the actuation protection, and also belongs to the safety device. In principle, it would also be possible as an alternative to design the actuation protection so that a commercially available tool can be used, for example a paper clip.

The latching mechanism may, for example, have a resilient latching tab of the clip or of the actuation protection, which engages behind a latching projection of the actuation protection or of the clip. The unlocking tool will, for example, move the latching tab against its spring force to release the latching connection. An opening in the actuation protection for insertion of the Entriegelungswerkzeuges may - based on the lateral position - be inside the opening in the trigger, so that the unlocking tool is inserted so that it also protrudes through the trigger through to the distal side and actuates the latching projection located there.

The unlocking tool may also have retaining structures that cooperate with corresponding structures of the actuation guard, such that the actuation guard is removable by pulling in the opposite direction to the insertion direction on the inserted unlocking tool.

The safety functions of the frame (preferably with laser protection flap) and the actuation protection are preferably integrated as an overall concept; but they can also be implemented independently of each other.

In addition to the duplex adapter and the security device, a security set with the integrated security functions of the frame and the actuation protection preferably also has a plurality of further frames and clips (or possibly entire duplex plugs), the frames on the one hand and the clips on the other hand preferably are matched in their coding, ie there are certain types of frames that can be used and / or used only with certain clips (and / or vice versa).

According to a further aspect of the invention, the LC adapter - simplex or duplex, with or without the frame discussed above - a one-piece plastic housing. One-piece plastic housing are also already known in the field of connectors. However, they have hardly been considered for LC adapters. The reason lies in particular in the Production of the recording of the guide sleeve (the so-called, sleeve '). The guide sleeve serves to guide the ferrules of the two connectors to be connected. This inclusion of the guide sleeve must of course be held or formed by the housing, and it must provide the guide sleeve a reliable fit, in particular against axial, caused by friction of the ferrule on the sleeve when entering and Ausführend in the adapter axial forces guaranteed. The insertion of the guide sleeve included according to the prior art, for example described in EP 0 768 547, the insertion into a receiving half of a connecting half and the subsequent joining of the two adapter halves forming the connection halves. The two receiving halves could then each have a guide sleeve axially fixing the guide collar. In a production as a one-piece housing, however, such a guide collar would make the imports of the guide sleeve difficult if not impossible.

Although US Pat. No. 7,318,751 shows an LC adapter with a one-piece metallic housing. However, it is for the guide sleeve requires a specially manufactured and to be fastened mounting cap, which is the manufacturing advantages of

At least to a large extent destroys one-piece integrity.

EP 1 199 587 shows a hybrid adapter with a one-piece housing, but in which no practical solution to the problem of inserting the guide sleeve is shown.

However, according to the aspect of the invention discussed herein, the female sleeve receptacle is now formed on the one-piece plastic housing (ie, forms part of and integral with the plastic housing) and is resilient on at least one side with a snap-action mechanism Recording formed self-formed element for latching fastening the guide sleeve. Thus, the guide sleeve can be held by the one-piece housing itself, without additional fasteners. For example, the receptacle itself can be designed sleeve-like, as is known per se, with collars projecting inwards on both sides, wherein a plurality of axially extending slots are present at least on one side, through which the corresponding side of the receptacle is subdivided into segments which are inserted during insertion the guide sleeve can escape resiliently to the outside.

Hereinafter, embodiments of the invention will be described in more detail with reference to drawings. In the drawings, like reference characters designate like or analogous elements. Show it:

Figure 1 is a view of a duplex adapter;

- Figure 2 is an exploded view of elements of the duplex adapter with securing device according to Figure 1;

Figure 3 shows a duplex connector as it can interact with the duplex adapter;

FIG. 4 shows a clip for forming a duplex plug of the type shown in FIG. 3;

FIG. 5 shows a first coding frame for a duplex adapter of the type shown in FIG.

FIG. 6 shows a mechanically coded clip alternative to FIG. 4; FIG. 7 shows a coding frame which is alternative to FIG. 5 for interacting with the clip according to FIG. 6;

8 shows an exploded view of a duplex plug with actuation protection and unlocking tool;

Figure 9 is a bottom view of the actuation protection;

Figure 10 is a view of the actuation guard cut along a plane through the axis of the connector;

Figure 1 1 is a view of the unlocking tool;

Figure 12 is an illustration of the cut along a plane duplex connector according to Figure 8 with partially introduced unlocking tool; and

Figure 13 shows a detail of the one-piece housing of the adapter with receptacle for the guide sleeve (sleeve).

The drawn in Figure 1 duplex adapter 1 for connectors type LC has an injection-molded, in the illustrated embodiment, a one-piece plastic housing 2. Adjacent to one another, plug openings 3 are formed in the housing 2, which allow the admission of standardized plugs or of a standardized duplex plug of the type "LC." In the interior of the plug openings, a laser protective flap 4 is present, which is inserted when inserting the plug Plug yields against a spring force and the socket opening releases. When re-executing, the laser damper will, due to the spring force, move back into the illustrated state covering the axis of the light-conducting elements before the plug leaves the adapter. In addition, a clipped on the front side (end side) frame 5 is present, which forms the proximal end of the adapter 1 and on which in the embodiment shown, the known per se, the upper side concave features of the LC adapter sockets. The frame surrounds both plug openings and has a middle section (web) 5.3 extending between the plug openings.

As can be seen more clearly in FIG. 2, the frame 5 has inter alia the function of fixing the laser protective flap 4 by means of the center section 5.3. The laser protective flap 4 is formed as a bent sheet metal, for example made of spring steel, wherein the sheet forms a single laser protective flap for both plug openings 3. The laser protective flap forming sheet is placed around the partition 2.1 between the plug openings 3. For this purpose, the sheet has in addition to a frontally abutting the partition wall 2.1 web section 4.1 two thereof bent wing sections 4.2, 4.3, each of which form the laser guard flap parts for the two plug openings. The wing sections extend adjacent to the web section, initially projecting from the latter in the distal direction substantially parallel to the dividing wall and then continuously curved as a function of the distance from the web section to the perpendicular to the dividing wall, so that they form the shape of a V with a continuous horizontal cross-section having outwardly curved arms. (One could also speak arms in the form of sections of a cycloid). This shape is particularly advantageous, because it ensures that when inserting the plug and the associated deformation of the sheet at each location, the voltages do not exceed a certain amount, so that takes place in the entire region, a substantially elastic deformation. Would the sheet, however, for example, then to the Ridge portion projecting vertically or at a large angle from the partition wall, however, in the region of the transition to the web portion would result in a deformation very large stresses, so that with repeated plugging and unplugging a purely elastic deformation would no longer exist. Another advantage of this form is that escaping laser beams are not fed back into the fiber / connector by the reflection.

The described shape of the laser protective flap 4 also has the further advantage that the orientation of the laser protective flap is also defined when the frame 5, as in the embodiment described here in the region of the middle section 5.3 to the distal Side is flat, so only rests on the web section 4.1 of the laser damper.

For the fixation of the frame 5 on the housing 2 latching means are provided which, as corresponding formations 2.2, 2.3; 5.1, 5.2 are formed on the housing and the frame whose exact shape is not essential to the invention, and therefore will not be described in detail here.

Figure 3 shows a duplex connector 1 1, as it can be used with the adapter according to Figures 1 and 2. As is known per se, the duplex plug 1 1 is composed of two commercially available simplex plugs 12, which are connected by a clip 13. The simplex connector 12 have unlocking pawls 14, which cause a latching when inserted into the adapter and the actuation of the adapter plug connection can be unlocked again. The latching in the latch behind corresponding structures of the adapter structures of Entriegelungsklinken 14 are designated in the figure with 14.1. The clip has an integrally formed with the clip trigger 13.1. This one is as integral with the rest of the clip, both unlocking pawls superior flap formed. By actuating the trigger both unlocking pawls 14 are actuated simultaneously.

FIG. 4 shows the clip 13 in another illustration. In the trigger 13.1 an opening 13.2 is formed, and in the region of the opening also employs a resilient locking tab 13.3. The functions of the opening and the locking tab will be described below in detail.

The frame 5 acts in addition to the already mentioned functions as a coding frame. This means that the frame on the one hand by the color choice can signal a suitability of the connector for certain applications, and, for example, indicates that only plug with a matching color clip can be placed. In addition or as an alternative, the frame can also have mechanical markings which interact with corresponding mechanical features of the duplex plug, in particular the clip, so that only suitable plugs can be inserted - and / or plugs can only be plugged into suitable adapters. 5 shows a frame 5 of the coding "neutral", which matches a clip 13 of the type shown in Figure 4. Figures 6 and 7 show a clip 13 and a frame 5 with a different coding, which by a projection 13.4 on Clip or a corresponding recess 5.4 is effected on the frame 5. A duplex plug with the clip 13 according to Figure 6 can not be plugged into an adapter with the frame according to Figure 5. Many further codings are possible The design of the mechanical coding between Frame 5 and clip 13 can also be executed inversely to the previously described type, ie with coding projection on the frame and corresponding depression in the clip. FIG. 8 shows an arrangement with actuation protection. FIG. 8 shows the duplex plug 1 1 from FIG. 3 inserted into the adapter 2. In addition, an actuation protection 21 is visible, which is also shown in Figures 9 - in another view - and 10 (partially cut).

The actuation protection has a dimensionally stable covering part 21.1 and a guide part 21.2. In the illustrated embodiment, the stiffness of the covering is supported by lateral reinforcements 21.3. The guide portion can be inserted into the opening 13.2 until the actuation protection is present at a stop. In this covers the cover 21.1 the trigger 13.1 from the proximal side down - the shutter is no longer accessible and can not tool-free, i. be operated by hand and without manipulation. In addition, the locking tab 13.3, which is pressed upon insertion of the cover protection down, behind the transverse wall 21.4 and secures the actuation protection against being pulled out. The actuation protection can not be removed without tools.

To release the locking connection an unlocking tool 22 is required, as shown in Figure 8 and in Figure 11. The unlocking tool has, in addition to a handle portion 22.1, an actuating portion 22.2, which is guided through the opening 21.5 (see Fig. 10) in the trigger in the cavity, which is behind the transverse wall 21.4 between the actuation guard 21 and the clip 13, and in which is the locking tab 13.3. By inserting the locking tab is deflected downward and releases the actuation protection for removal by train to the proximal direction. The actuating part 22.2 of the unlocking tool also has retention structures 22.4, which cause a latching of the Entriegelungsgewzeuges with the actuation protection, so that it can be removed by train on Entriegelungsgewzeug. The retaining structures 22.4 are formed in the illustrated embodiment as retaining lugs, the front side of resilient, the operating part forming legs are mounted and engage in a widening 21.6 in the actuation protection.

Figure 12 shows the above-described deflection of the locking tab 13.3 through the

Entriegelungswerkzeug 22. The unlocking initially sees the insertion of the unlocking tool 22 in the opening 21.5 to a

Stop before (arrows 41). As a result, the locking tab 13.3 is pressed down

(Arrow 42) and releases the actuation protector 21 for removal (arrow 43), for example by pulling on the unlocking device 22, which is latched to the actuation protector. Subsequently, the trigger 13.1 can be actuated (arrow 44), which causes a release of the latch 14 (arrow 45).

As can also be seen in FIG. 12, here the blocking of the trigger 13.1 takes place either by covering and inaccessible by the actuation protection 21 or by blocking a pivoting movement by abutment of the guide section on the boundary of the opening 13.2 or by both these means, as shown in the figure.

The above discussed aspect of the invention has been discussed in terms of a duplex connector formed by two initially separate simplex plugs (12) held together by a clip (13). However, the invention can just as well be carried out with duplex plugs whose two plug housings are integral with one another or which are otherwise fastened to one another, in which case the release can be formed by the common housing.

The above figures describe the invention with reference to a one-piece adapter. A corresponding adapter part (not shown) corresponds, for example, in Substantially one half of the drawn in Figure 1 adapter, with the features drawn in the following figures. It can also be designed as a so-called. 'Receptacle' and so serve, for example, for coupling to a transmitter, receiver, transceiver or repeater.

FIG. 13 shows a detail of the receptacle of the guide sleeve 31 (of the 'sleeve'), which is formed by the preferably one-piece plastic housing 2. The receptacle penetrates the approximately in the middle, with respect to the axial direction, arranged base wall 2.11. The base wall is, for example, approximately on the optical plane. The receptacle 2.12 is itself formed like a sleeve, with an outer diameter of the guide sleeve 31 adapted inner diameter. It has on both sides each a collar 2.13, which secures the guide sleeve against axial displacements. At least on one side, the receptacle is slotted multiple times (shown is a slot 32) so that it is subdivided into a plurality of axially extending segments, which can escape when inserting the guide sleeve - from the slotted side - resiliently outwards.

The one-piece concept described here is also readily applicable to simplex adapters and to connectors of types other than the LC type.

Claims

1. A security device for an optical connector, comprising a

Duplex plug (11) with two sub-plugs (12) or a clip (13) for

Prepare a duplex connector (1 1) from two simplex connectors (12) and a trigger (13.1) to trigger release latches at the same time

(14) of both plugs (12) characterized by an actuation protection (21) with a dimensionally stable covering part (21.1) for covering the trigger (13.1) towards the proximal side, and one with the duplex plug (11) or clip

(13) cooperating guide section (21.2) which can be locked in such a way with the duplex plug (1 1) or clip (13) that it is not releasable from this tool.

2. Safety device according to claim 1, characterized in that the trigger (13.1) is formed as projecting away from the plug axis to the distal direction away flap and a trigger opening (13.2) through which in the secured state, the guide portion (21.1) protrudes.

3. Safety device according to claim 1 or 2, characterized in that the actuation protection (21) has an opening (21.5) that the safety device further comprises a Entriegelungswerk (22) on which an actuating part (22.2) is formed, of which a cross section is adapted to a cross section of the opening (21.5), and that the unlocking tool by inserting the actuating portion (22.2) in the opening a locking between the actuation protection (21) and the duplex plug (1 1) or clip (13) dissolves.

4. Securing device according to claim 3, characterized in that the unlocking tool retaining structures (22.4), which cause a latching of the Entriegelungsgewzeuges with the actuation protection, so that the actuation protection by train on the unlocking tool from the duplex plug (1 1) or clip (13 ) is removable.

5. Safety device according to claim 3 or 4, characterized in that the opening (21.5) of the actuation protection extends through the trigger opening (13.2).

6. Securing device according to one of claims 3-5, characterized in that a latching mechanism, the latching the

Guide section (21.2) with the duplex connector (1 1) or clip (13) causes, by a resilient latching tab (13.3) of the duplex connector (11) or clips (13) is formed behind a latching projection (21.4 ) of the actuation protection or the clip engages.

7. Duplex adapter or adapter part (1) for a duplex connector of an optical connector, comprising a housing (2) and two adjacent connector openings (3) into which a duplex connector is inserted, wherein between the adjacent connector openings a partition wall (2.1) is arranged, characterized by a frame (5) proximally protruding from the housing (2) fixed to the housing and surrounding the two plug openings (3) of an adapter side and a middle section (5.3) extending between the plug openings. having.

8. duplex adapter or adapter part (1) according to claim 7, characterized in that the frame is color-coded and / or mechanically coded.

9. duplex adapter or -Adapterteil (1) according to claim 7 or 8, characterized by a radiation protection flap (4) which projects into the interior of the plug openings, in the absence of an inserted plug in a first position covers an optical axis of the respective plug openings and through Insertion of the plug against a spring force from the first position is deflected, wherein the radiation protection flap (4) by the frame (5) is fixed to the housing (2).

10. duplex adapter or -Adapterteil according to claim 9, characterized in that the radiation protection flap (4) is made in one piece from an elastically deformable metal sheet having two wings (4.2, 4.3), each having the optical axis of the first and the second cover the adjacent plug openings (3).

1 1. duplex adapter or -Adapterteil (1) according to claim 10, characterized in that the radiation protection flap between the partition (2.1) and the middle part (5.3) of the frame extending web section (4.1), from which on both sides depending one the two wings projecting into the first and the second plug opening, wherein each of the wings after the web section initially extends in the distal direction and is then bent continuously toward the perpendicular to the partition wall (2.1).

12. duplex adapter according to one of claims 7-11, comprising two pairs of aligned plug openings, in each of which from opposite sides a duplex plug is inserted, characterized in that the housing is in one piece and the four pairs of mutually aligned plug openings (3) ausformt, wherein the

Duplex adapter also has two guide sleeves for guiding and aligning Steckerferrulen, wherein the housing forms a receptacle (2.12) for one of the guide sleeves (31) per pair of mutually aligned plug openings, wherein the receptacle sleeve-shaped with both sides one end radially inward protruding collar (2.13) is formed, and wherein the receptacle on at least one side has a plurality of axially extending slots (32).

13. A fuse assembly for a system of optical connectors, comprising a duplex adapter (1) or a duplex adapter part for a duplex connector of an optical connector, with a housing (2) and two adjacent connector openings (3), in which a duplex plug is insertable, wherein between the juxtaposed plug openings a partition wall (2.1) is arranged, with a housing attached or attachable, from the housing (2) proximally projecting frame (5), the two plug openings (3) one Enclosed on the adapter side and having a between the plug openings extending center section (5.3), and at least one securing device according to one of claims 1 -6, wherein the duplex plug (1 1) with the duplex adapter (1) or duplex adapter part cooperates.

14. Fuse set according to claim 13, comprising at least one further frame (5) whose color and / or shape of the color or shape of a first frame (5) is different, and at least one further duplex Plug (11) or clip (13) whose color and / or shape is different from the color or shape of a first duplex connector or clip, so that there is a system of coordinated color and / or mechanical coding of the frame and the duplex connector or clip results.