EP1257009B1 - Strain relief for a single pole flat contact plug connector and a plug connector therewith - Google Patents

Abstract

An in-line electrical connector has a two housing parts (2) within which are metal contacts (11) that engage and latch with each other. The contact sleeves are fitted to the ends of multiple core cables. The cables are protected from axial loads by elements (20) which have projecting strips (23) to engage the cable.

Description

The present invention relates to a strain relief according to the invention for the connection cable of a 1-pin electrical connector or for this, designed as a flat contact main contact and a housing having a front plug-in approach, which consists of an upper first plug-in projection portion with a cross-sectional U- shaped and open to the front longitudinal receptacle and consists of a below it to this opening laterally in each case with its outer wall, in cross-section also U-shaped second plug projection portion for receiving a part to be covered of the main contact, wherein an over-insertion of the connector with an identical second, rotated connector on the thus formed and mirror-symmetrically to be arranged plug neck portions for making an electrical connection is possible,
and with a extending from the inner end of the plug-in projection to the outside of the cable connection, a connection sleeve of the main contact, the in the longitudinal receptacle protrudes, surrounding, elongated in cross-section rectangular rear housing part with an upper and lower longitudinal side, which terminates to the back of the connector.

Furthermore, the invention relates to such a 1-pin electrical connector with applied inventive strain relief.

According to US-PS 3,259,870 a 1-pole electrical connector of this type is known, the main contact is formed as a flat contact and thus in particular according to the US standard, in which such connectors are not formed with plug-in elements according to the pin / sleeve principle.

In contrast to multi-pin device plug-in devices, which have a wide housing with a plurality of laterally adjacent mating approaches, on the top of the housing enough space for mounting a suitable for pulling the connector of two connectors handle and at the bottom there is space to secure a strain relief , which consists of two clamps for the additionally to be attached multi-pin connection cable, the housing surface of a 1-pin connector is too narrow to mount a handle with strain relief.

This is also because in particular on the housing of the 1-pin connector of the type mentioned on the opposite outer sides a latching connection is created, which allows laterally side by side and one above another several such connectors via a dovetail spring and groove under lock to multipolar connectors zusammenzustecken.

Since the housings of such connectors, depending on the size of the maximum allowable currents of 15 A to 180 A at voltages of e.g. 150 V, 160 V or 320 V only have a width of 0.79 cm to 2.86 cm, can not be mounted on this a handle that widened to its outer end to a handpiece.

EP-A-0 716 476 discloses a strain relief according to the preamble of claim 1.

The plant of the known, to be integrated in the handle strain relief is so far not possible with a 1-pin connector.

It turns so far the task of creating a safe, easy to apply to his housing detachable or retrofittable strain relief for a 1-pin connector. This in particular inasmuch as it has been shown time and again that shearing and pulling forces occurring on the connecting cable release this from the pressing used for fastening to the connecting sleeve of the main contact, since no additional fastening is provided by a strain relief. Furthermore, it is a connector to create the type mentioned with such applicable strain relief.

To solve this problem, a strain relief according to claim 1 is formed, which is provided with a protruding cable holder and is set on the top or bottom of the housing of the 1-pin electrical connector and preferably according to claim 2 in the there already applied, from a longitudinal groove or Longitudinal spring existing part of a dovetail longitudinal guide can be inserted and on the outside by means of a lock additionally secured against displacement.

The strain relief consists of a bracket having a component, which consists of a one on the back and over the upper or lower longitudinal side of the rear housing part, an elongated, flat, web-like first support portion and the other from a second, on the back the rear housing part extending in the housing longitudinal second second support portion. Over the rear side of the rear housing part, this second mounting portion extends with an outwardly and then radially inwardly projecting towards the central longitudinal axis of the connector neck, which engages behind this end of the housing at the rear and thus additionally determines the mounting of the strain relief on the housing.

At this approach, a trough-shaped, this partially surrounding bearing is applied to guide and attach the connection cable on the outside or inside and a protruding cable holder.

It is possible to guide the first support portion over a majority of the length and width of the outside of the rear housing part over its longitudinal side, wherein the height of the support portion to the height of the housing of the connector is made small and only a few millimeters.

When planting a dovetail guide to the holder also engages the dovetail spring of this component in the dovetail longitudinal groove of the housing longitudinal side, so that the less protruding and thus flat, but in cross-section thicker, stable component results after assembly.

This also applies to the second mounting portion, which is preferably formed as a one-piece component with the first support portion and projects only with its over the housing end axially and radially inwardly projecting approach to the first support portion.

With a housing width of 0.79 cm, the first and second support portion can be formed with a total length of 2.45 cm and a maximum height of 0.49 cm, due to the existing dovetail guide projecting this component on the top or bottom of the rear housing part also only with a maximum of 0.2 - 0.25 mm.

Since this holder does not protrude laterally beyond the right and left side wall of the housing, a mating of several 1-pin connector via these side walls is not hindered despite installation of the strain relief.

Since this is to be fixed on the rear housing part strain relief in their height is very low and rests flat on the rear housing part, more connectors can also be created one above the other, which is possible by screwing into the outer walls longitudinal bores these connectors with each other.

Laying down the dovetail guide in the axial direction on the upper or lower longitudinal side of the housing is provided according to claim 3 that on the front right half of the first support portion of this is formed with a tapered web-shaped narrow approach, which also rests flat and with its front end up in the proximity of the plug-in approach is performed.

This section serves to lock the holder on the housing longitudinal side, wherein at its end a locking hook is provided, which engages downwardly in a latching opening applied to this housing longitudinal side for locking.

Since the cable holder preferably designed only as a cable tie according to claim 4 is applied in the radially inwardly projecting projection of the second mounting portion and only projects beyond this on the outside or inside, it is possible to create the cable holder in a compact form largely integrated in the approach, this preferably protrudes inwardly only with two tab-like drawstrings from the approach to the connection cable.

This outer side is preferably provided according to claim 5 with a bearing for receiving and guiding the connecting cable to be fastened, which is formed in the form of a molded trough-like longitudinal receptacle.

The claims 6 and 7 relate to advantageous embodiments of the cable binding with two drawstrings, which each form a portion of the connecting cable surrounding, festzuziehenden tab and are fixable by means of an additional buckle-shaped holder.

According to claim 8 and claim 9, a 1-pin device plug-in device with a strain relief according to claims 1-7 is provided, in particular on laterally side by side or superimposed sides Detent devices are provided which allow the connection of two 1-pin connector to a 2-pin connector, which has two strain reliefs (dovetail guide).

According to claim 10, an arrangement of a plurality of laterally and / or stacked 1-pole connectors according to claim 8 and 9 is provided.

The invention will be explained in more detail below with reference to an embodiment of the strain relief and such a strain relief having 1-pin device connector.

Figur 1a, 1b, 1c:

Eine Ausführungsform der als einteiliges, aufsteckbares Zubehörteil ausgebildeten Zugentlastung in Seitenansicht, Vorderansicht und Draufsicht, ohne Darstellung der zusätzlich benötigten Zugbänder des Kabelbinders;

Figur 2a:

Eine perspektivische Ansicht des Gehäuses eines 1-poligen elektrischen Steckverbinders mit links befindlichem Steckansatz, ohne eine am rechten Teil des Gehäuses anzuordnende Zugentlastung;

Figur 2b:

die Darstellung eines Hauptkontaktes mit Rast- und Kontaktabschnitt sowie Anschlußhülse;

Figur 2c:

eine Seitenansicht zweier übersteckter Steckverbinder gemäß Figur 2a und 2b, deren spiegelsymmetrisch zueinander angeordnete Steckansätze mittig zu liegen kommen;

Figur 3:

eine Draufsicht auf das Gehäuse eines 1-poligen Steckverbinders gemäß Figur 2a, wobei das den Steckansatz tragende Gehäuseende nach rechts ausgerichtet ist;

Figur 4:

einen Querschnitt durch das seitlich links des Steckansatzes befindliche hintere Gehäuseteil des Steckverbinders gemäß Figur 3 unter Darstellung einer auf gegenüberliegenden Gehäusewandungen befindlichen Anordnung von Längsnut und Längsfeder zum Verbinden mehrerer nebeneinander anzuordnender Steckverbinder;

Figur 5:

einen Querschnitt zweier übersteckter Steckverbinder mit jeweils einem eingebrachten, am äußeren Ende eine Anschlusshülse und am innerenEnde einen Rast- und Kontaktabschnitt tragenden Hauptkontakt;

Figur 6:

Eine Seitenansicht, teilweise in Schnittdarstellung, auf eine Anordnung der Zugentlastung gemäß Figur 1a, 1b und 1c auf der Gehäuseoberseite eines 1-poligen elektrischen Steckverbinders, mit an dessen Anschlusshülse angeschlossenem Anschlusskabel, welches durch einen am äußeren Ende des Steckverbinders angelegten, eine Zugentlastung bildenden Kabelbinder zusätzlich befestigt ist;

Figur 7:

Eine Draufsicht auf das Ende der Anordnung aus Zugentlastung und Steckverbinder gemäß Figur 2 unter teilweiser gleichzeitiger Wiedergabe von Querschnittsansichten gemäß den Schnittlinien AA und BB der Figur 2.

Figur 8:

eine vollständige Ansicht auf das Ende des Steckverbinders und die auf die Längsseite oberhalb davon aufgebrachte Zugentlastung mit einer Querschnittsdarstellung des sich in den Steckverbinder erstreckenden Anschlusskabels, wobei zwei derartige Steckverbinder miteinander seitlich verrastet dargestellt sind;

Figur 9:

einen Längsschnitt durch zwei mit ihren Steckansätzen übersteckte Steckverbinder, welche gemäß Figur 6 und 7 jeweils mit einer Zugentlastung versehen sind.

In the drawings show:

FIGS. 1a, 1b, 1c:

An embodiment of the trained as a one-piece, attachable accessory strain relief in side view, front view and top view, without showing the additional required drawstrings of the cable tie;

FIG. 2a:

A perspective view of the housing of a 1-pin electrical connector with left-side plug-in approach, without a to be arranged on the right part of the housing strain relief;

FIG. 2b:

the representation of a main contact with latching and contact portion and connecting sleeve;

FIG. 2c:

a side view of two plug-in connector according to Figures 2a and 2b, the mirror-symmetrical to each other arranged plug approaches come to lie in the middle;

FIG. 3:

a plan view of the housing of a 1-pin connector according to Figure 2a, wherein the plug end bearing housing end is aligned to the right;

FIG. 4:

a cross section through the laterally located on the left side of the plug attachment rear housing part of the connector of Figure 3 showing a located on opposite housing walls arrangement of longitudinal groove and longitudinal spring for connecting a plurality of juxtaposed connector to be arranged;

FIG. 5:

a cross section of two plug-in connectors, each with an inserted, at the outer end of a connection sleeve and the inner End of a locking and contact portion bearing main contact;

FIG. 6:

A side view, partially in section, of an arrangement of the strain relief of Figure 1a, 1b and 1c on the housing top of a 1-pin electrical connector with connected to the connection sleeve connecting cable, which by a at the outer end of the connector forming a strain relief cable tie additionally attached;

FIG. 7:

A top view of the end of the arrangement of strain relief and connector of Figure 2 with partial simultaneous reproduction of cross-sectional views according to the section lines AA and BB of Figure 2.

FIG. 8:

a full view of the end of the connector and the applied to the longitudinal side above it strain relief with a cross-sectional view of extending into the connector connecting cable, wherein two such connectors are shown side by side locked;

FIG. 9:

a longitudinal section through two plugged with their mating connectors connector which are provided according to Figure 6 and 7 each with a strain relief.

The strain relief (1) to be fastened as a retrofittable adapter on the upper housing longitudinal side (14) of the 1-pole electrical connector (2) and extending longitudinally beyond its rear side (7) is shown in three views in FIGS. 1a, 1b and 1c , where only the actual holder of the strain relief without the additionally to be attached to this holder cable tie (22) is shown there.

The installation of the cable tie is shown in FIG. 6 to FIG. 9, in which the arrangement of 1-pole electrical plug-in connector and strain relief applied there is shown, and connecting cable guided laterally out of the housing of the connector, which is additionally represented by two tab-shaped drawstrings (23, FIG. 23 ') of the cable tie (22) of the strain relief is attached.

As can be seen from FIG. 1a and FIG. 1c, the part which acts as a holder for the strain relief consists of an elongate, flat first holding section (18) which can be fixed on the upper longitudinal side (14) of the rear housing part (5) of the connector (2) according to FIG. which extends with its front end to the right in the direction of the plug-in projection (4) of the connector (2).

This support portion (18) has over the first half of its length a web width corresponding to the width of the rectangular in cross-section rear housing part (5), wherein over the second half of the length of this section (18) extending part in the form of a mere latching finger tapers in the web width, at the outer end to form a lock (19) down a locking hook (19 ') extends. This part is not only tapered in the ridge width, but also with respect to the first part of the support portion (18) designed with a lower height, so that it has good elastic properties for bringing the lock (19) of the holder of the strain relief (1) on the housing top (14) of the connector has.

On the elongated flat first support portion (18) a second support portion (20) is applied to the left side, which has about half the length of the first support portion (18), but with a radially downwardly projecting lug (21) opposite the bottom of the first support portion (18) forms a projecting collar.

This collar comes when mounting of the support sections (18) and (20) formed part of the strain relief (1) on the upper longitudinal side (14) of the rear housing part (5) of the connector as a stop laterally outward against the back (7) of the rear Housing to lie.

While at the bottom of the left portion of the first support portion (18) centrally a longitudinally extending, formed as part of a dovetail guide longitudinal spring (17) is applied, which with a along the top (14) of the rear housing part (5) centrally extending longitudinal groove (16) for securing the strain relief (1) is engageable,
is on the underside of the second down with the projection (21) projecting support member (20) a trough-like longitudinal receptacle for forming a bearing (25) for there by the strain relief (1) to be fastened connection cable (31) of the connector created.

This trough-like longitudinal receptacle opens to the underside and thus comprises laterally from above the outside of the connection cable (31) to be additionally fastened there.

To now one of the underside of the second support portion (20) outgoing cable tie (22) consisting of two tab-section-like Zugbändern (23,23 ') is to be able to attach to the neck (21) are each two spaced, from the top of the support portion (20) across the approach to the trough-like longitudinal receiving bottom forming extending vertical receiving holes (29, 30) which pass to the top in openings (27,28).

These openings are placed on the surface in an inner portion which is lowered in height relative to the height of the two outer walls of the support portions (18,20).

In this respect, on the one hand results in a sufficiently large receiving space for guiding the or the drawstrings of the cable tie (22) at the top of the second support portion (20), wherein the tension band is taken protected so far and not projecting upwards. On the other hand, a considerable reduction in the dimension of the holder of the strain relief is possible, with a flat design of the web-shaped first support portion (18) also results in the first half and only the height is increased on the outer sides by the laterally projecting outer walls there.

In the front view of the strain relief (1) according to Figure 1b can be seen on the underside of the second support portion (20) as a bearing (25) formed in cross-section circular-segment-shaped, trough-like longitudinal receptacle, wherein at the top of the support portion (20) of the return of the middle Area of this surface is shown with respect to the outer walls, so that in this respect a receptacle for guiding the drawstrings of the cable tie is given.

In each case, the receiving bores (29, 30) extending perpendicularly at a distance from one another are shown with the openings (27, 28) which adjoin upwards for guiding the drawstrings of the cable tie (22).

The width of the one-piece mounting of the strain relief mounting portions (18,20) corresponds to the maximum width of the housing conventional standard 1-pin electrical connector and is 0.79 cm as designed for 15/30 A. The height is 0.49 cm over the area of the second support section (20), wherein, taking into account the surface of this section which projects back towards the center, there is only a height of 0.39 cm there.

The total length of the holder of the strain relief consisting of the two support sections (18, 20) is 2.45 cm and the length of this part without the projecting outer part of the support section (18) is 1.66 cm.

The structure of the used 1-pin electrical connector (2,2 '), in particular its housing (3) and the arrangement of the strain relief (1) on the rear housing part (5) of the connector results from Figure 2a, 2b, 2c, 3, 4 and 5 or Figure 6 to Figure 9.

According to FIG. 2 a, the 1-pole plug-in connector (2) has a cuboidal housing (3) which extends into an insertion projection (4), which is applied on its left side and in the representation according to FIGS. 6, 7 on its right side and laterally outside thereof located rear housing part (5) divides.

The plug-in approach (4) and the rear housing part (5) each have the same width and have a bottom, which comes to rest at the same height. In contrast, the height of the plug-in projection (4) is smaller than that of the rear housing part (5), with the possibility of the extent of two appropriately rotated to each other connector (2,2 ') on the mere addition subdivided plug approaches according to Figure 9 results.

The plug-in approach (4) consists of a first insertion projection portion (4 ') with an upper, in cross-section U-shaped longitudinal receptacle (4a) and from an upper downwardly opening, laterally and in height each with its outer wall recessed, in cross section also U-shaped further plug projection portion (4 ") for receiving the portion to be covered of the applied in the connector main contact (9).

From the rear side of this plug-in projection portion (4 ') then goes out the rear housing part (5), on which the strain relief (1) according to Figure 6-9 with the support portions (18,20) is applied.

The plug approach portion (4 ") for receiving from this to the inside of the first plug projection portion (4 ') above, to be covered part of the main contact jumps, as indicated in Figure 2a and Figure 6, on both sides with its outer wall relative to the wall of the first plug attachment portion This recess (6) is designed in such a size that this second plug-in approach portion when plugging with the plug approach of a second connector (2 ') in the forward with a larger receptacle (4a) opening the first plug-in projection portion (4') inserted is.

In a device plug device from the plug and socket of this 1-pin connector are so far plug and socket identical.

To attach the holder of the strain relief (1) with the two support sections (18,20), it is only necessary to use a dovetail-like longitudinal groove (17) already present on the upper longitudinal side (14) of the rear housing part (5), in order there to introduce the dovetail-like longitudinal spring (16) applied to the underside of the first mounting portion (18), in which respect the Longitudinal spring (16) corresponding to the shape and dimension of the longitudinal groove (17) is formed and from these on the longitudinal side (14) of the rear housing part (5) results in a longitudinal guide.

In order to achieve a determination of the holder of the strain relief or the extent formed dovetail guide against longitudinal displacement, the rear housing part (5) on its surface relative to the standard housing only additionally a detent opening (26).

It is shown in Figure 6, the engagement of the locking hook (19 ') of the latch (19) in this latching opening (26).

An additional attachment of the support portions (18,20) relative to the rear housing part (5) results from the special design of the second support portion (20) with a downwardly laterally of the housing part (5) projecting lug (21), wherein the projection (21 ) has a width such that the laterally right-hand collar projecting from the underside of the first support portion (18),
with a stop surface directly against the back (7) of the rear housing part (5) comes to rest.

As attachment of the axially out of the laterally left end of the rear housing part (5) guided connection cable (31) in the second support portion (20) and its radially inwardly projecting lug (21) of the already with respect to Figure 1a - 1c mentioned cable ties (22) guided. This extends through two in the present side view of successive receiving bores (29,30), which at the top of the rear housing part (5) in the there located openings (27,28) pass.

The cable tie (22) consists, as shown in Figure 6, essentially only two laschenabschnittartigen drawstrings (23,23 '), which at the top of the support portion (20) integrally into one another in the manner of a loop, and which there from the surface are drawn with a top approach above.

At their lower ends, that is to say in the sections below the connection cable (31), these drawstrings (23, 23 ') each have closure parts in the form of a frame part (24) and a latching section (24'), wherein the Has locking portion in a known manner over a suitable portion of its surface parallel offset locking ribs.

In addition to the longitudinal groove (16) drawn on the longitudinal side (14) of the rear housing part (5), a dovetail-like longitudinal groove (16 ') and two longitudinal springs (17', 17 ') are provided on the outer sides (12, 13) of this housing part (5) in a known manner. 17 ') attached. In that sense, it is possible store several 1-pin electrical connector side by side and thus to form a multi-pole electrical plug-in device (Figure 4, 8).

In the side view on the left in Figure 6 end of the arrangement of strain relief and connector of Figure 7 can be seen a lower wall part (with lower longitudinal side (15 ')) and a part of the lateral part of the wall (with housing outside (12,13) ) of the rear housing part (5), which comes to lie behind the section line BB of Figure 6.

Since the cross-sectional view according to the section line BB through the cutting plane of the drawstrings (23,23 ') of the cable tie (22) and the connecting cable is, you can also see in cross-section through this strain relief (1) additionally determined connection cable (31), said right portion of the drawing of the wall portion is shown, through which the receiving bore (30) for guiding the right drawstring (23) extends.

In contrast, only the lower left section of the tension band (23 ') is located.

Above this drawing part opens the cross-sectional cutout along section line AA of Figure 6, which is guided by the with a longitudinal spring (17) formed on the underside first support portion (18) and the underlying rear housing part (5).

In this cross-sectional view of the engagement of the longitudinal spring (17) with the longitudinal groove (16) of the rear housing part (5) can be seen.

References list

Strain relief 1 1-pin electrical connector 2,2 ' casing 3 plug-in projection 4 rear housing part 5 first plug-in section 4 ' second plug-in section (contact receiving part) 4 ' longitudinal recording 4a Return of the second insertion projection section 6 Rear side of the rear housing part 7 cable connection 8th Main contact (flat contact with steel leaf spring) 9 Rest and contact section of the main contact 10 connecting sleeve 11 right and left case outside 12.13 upper longitudinal side of the rear housing part 14 lower longitudinal side of the rear housing part 15 longitudinal groove 16.16 ' longitudinal spring 17,17 ', 17 " web-shaped first mounting portion 18 lock 19 locking hooks 19 ' second support portion 20 outer radially inwardly projecting approach 21 Cable tie (cable holder) 22 Drawstrings of the cable tie 23.23 ' frame part 24 detent portion 24 ' camp 25 latching opening 26 Openings for the cable tie 27.28 mounting holes 29.30 connection cable 31

Claims (10)

1. Strain relief device (1) for the connection cable (31) of a single-pole electric plug-in connector (2, 2') and/or for said connector, comprising a main contact (9) designed as a flat contact and a housing (3) having a front plug-in projection (4), which comprises an upper first plug-in projection portion (4') having an, in cross section U-shaped, longitudinal receiver (4a) open towards the front and, located therebelow, an, in cross section likewise U-shaped, second plug-in projection portion (4"), which opens towards said first portion and is set back laterally in each case with its outer wall, for receiving a mating part (10) of the main contact (9), wherein a mating of the plug-in connector (2) with an identical second, rotated plug-in connector (2') is possible by means of the plug-in projection portions (4', 4"), which are aligned in said manner and are to be arranged mirror-symmetrically, to establish an electrical connection,
   and comprising an elongate, in cross section rectangular, rear housing part (5), which extends outwards from the inner end of the plug-in projection (4) to the cable connection (8) and surrounds a ferrule-terminal (11) of the main contact (9) projecting into the longitudinal receiver (4a) and has a top and bottom longitudinal side (14, 15), the rear housing part running out towards the back (7) of the plug-in connector (2, 2'),
   characterized in that
   with establishment of the strain relief device (1) against the back (7) and only over one of the top or bottom longitudinal sides (14, 15) of the rear housing part (5), on a flat component of the strain relief device (1) a holding arrangement (18, 20, 22) is disposed, which comprises an elongate, flat, web-shaped first holding portion (18) which can be fastened on the longitudinal side (14, 15), and that said portion is adjoined by a second holding portion (20), which extends in longitudinal direction to a point beyond the back (7) of the rear housing part (5) and engages behind the back from above or below with a radially inwardly protruding projection (21) and on the outer or inner side of which a bearing (25) and a cable grip for the connection cable (31) to be fastened protrudes.
2. Strain relief device according to claim 1,
   characterized in that
   extending on the longitudinal side (14, 15) over a region of the, in cross section rectangular, rear housing part (5) is a longitudinal groove (16) and/or longitudinal tongue (17'), in or on which the web-shaped holding portion (18) of the strain relief device can be pushed and fastened by means of a longitudinal tongue (17) and/or longitudinal groove disposed on its inner side to form a dovetail guide (16, 17).
3. Strain relief device according to claim 2 or 3,
   characterized in that
   for fixing the dovetail guide (16, 17) of the first flat, web-shaped holding portion (18) against longitudinal displacement, there is disposed on the front end thereof towards the underside as a lock (19) a securing hook (19'), which can be brought into engagement with a detent opening (26) provided at the housing longitudinal side (14, 15).
4. Strain relief device according to claim 1, 2 or 3,
   characterized in that
   in the radially inwardly protruding projection (21) a cable tie (22) is provided as a cable grip for the connection cable (31).
5. Strain relief device according to one of claims 1 - 4,
   characterized in that
   on the second holding portion (20) of the strain relief device there is provided, on the underside of the projection (21) that engages behind, a bearing (25) having a trough-like recess that opens towards the connection cable (31) for supporting the connection cable (31) of the plug-in connector (2, 2') that is to be fastened there.
6. Strain relief device according to claim 4 or 5,
   characterized in that
   the cable tie (22) comprises two mutually tightenable and fastenable tension bands (23, 23'), which form strap sections surrounding the outside of the connection cable (31).
7. Strain relief device according to claim 6,
   characterized in that
   on the end of the tension band (23') a shackle-like frame part (24) is disposed and on the end of the other tension band (23) at the outside over a longitudinal portion a plurality of spaced-apart detent ribs extend transversely over the width of this tension band and in an outward direction first rise at an acute angle and then fall back at an angle of at least 90° onto the outer side of the tension band (23), wherein in the frame part (24) the end of the tension band (23) can be introduced and fastened by means of the detent portion formed by the ribs, with simultaneous shortening of the length of the loop formed by the cable tie (22).
8. Single-pole appliance connector having a strain relief device (1) according to one of claims 1 - 7 disposed on the top or bottom longitudinal side (14, 15).
9. Single-pole appliance connector according to claim 8,
   characterized in that
   in each case on two opposite housing outer sides (12, 13) of the rectangular rear housing part (5) of the plug-in connector a longitudinal groove (16") and/or a longitudinal tongue (17', 17") of a dovetail guide is disposed, wherein the first plug-in connector and a second plug-in connector may be plugged together side by side or one on top of the other to form a two-pole plug-in connector.
10. Arrangement comprising a plurality of plugged-together plug-in connectors with strain relief devices according to one of the preceding claims 1 - 9, wherein these are laterally interconnected in a detachable manner.

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