DE202004016097U1 - Pipe connecting system comprises socket, into which plug-in connector fits, which is made up of outer sleeve and inner sleeve with claws which are compressed to hold plug-in connector when it is rotated inside outer sleeve - Google Patents

Abstract

The pipe connecting system comprises a socket (4), into which a plug-in connector (8) fits. The socket is made up of an outer sleeve (18) and an inner sleeve (20) with claws (12) which are compressed to hold the plug-in connector when it is rotated inside the outer sleeve.

Description

The The present invention relates to a connector for locking and sealed plug-in connection of media lines (pipe or hose lines for any flow or printing media), consisting of a receiving part with a receiving opening for a line side, a cylindrical peripheral surface having Einsteckabschnitt, being in the area of the receiving opening Holding means and sealing means are provided which are for locking or sealing against the peripheral surface of the insertion Act.

such Connectors are available in various designs from numerous publications known. They are used for fast and preferably also detachable connection of pipe or hose lines, in particular of plastic, by an end-line insertion portion simply into the receiving part is inserted.

In such a in the DE 30 11 430 C2 plug-in fitting described are seen within the receiving part in the insertion initially a sealing ring as a sealing means and adjacent thereto as a holding means a slotted toothed ring mounted. Therefore, this device corresponds to the principle "sealing before holding", since the line is already sealed, if it has not yet reached the area of the toothed ring and therefore can not be locked yet. The tube must therefore always be inserted far enough above the toothed ring out. A locking takes place only by an opposite pulling movement of the tube by the toothed ring is drawn into an inner cone within the receiving part and thereby radially narrowed so that press its tooth edges in the cylindrical, smooth peripheral surface. This design involves a high risk of incorrect assembly by not sufficiently far plugging, so that a secure locking is not guaranteed in all cases.

The publications EP 0 196 881 A2 and EP 1 199 506 A1 each describe a pipe coupling, in which the pipe end when inserting first in the area of the holding means and only then enters the area of the sealant. The locking takes place according to the first mentioned publication EP 0 196 881 A2 by means of a collet, which is clamped by retraction via an inner cone radially against the tube. In the case of the second publication EP 1 199 506 A1 a metal serrated ring is provided with barb-like radially inwardly and obliquely protruding in the insertion direction retaining tongues, which are spread slightly radially by the insertion movement by abutment on the tube peripheral surface and dig in a pulling movement in the tube circumference. In both cases, an insufficiently wide insertion leads to a locking, but possibly not yet to a sufficient seal (principle "holding before sealing"). In addition, the tube must be moved with its end-side sealing area through the region of the holding means. This has the disadvantage that axial grooves may be formed on the peripheral surface, which may affect the seal in the region of the sealant.

at all known designs It is always problematic, from the outside the correct, both arrested as well as sealed position of the insertion to recognize. It is therefore in the prior art measures for plug-in control described.

From the EP 1 296 089 A1 It is known to actuate a plug-in indicator by inserting the pipe plug-in section. But a seal is provided within the tube, resulting in a disadvantageous cross-sectional constriction.

In the DE 195 36 333 A1 is a plug-in indicator in the form of a leakage path described in combination with two-stage holding means. In a Vorarretierstellung there is a defined limited leakage, resulting in an acoustically perceptible leakage noise. Such a solution is suitable only for pneumatic compressed air systems, but not for pipes for other, possibly environmentally hazardous gases and liquids, in which leaks must be avoided.

Of the The present invention is based on the object, a connector to create the generic type described above, the at easy handling and good operating characteristics always one safe holding and sealing function guaranteed and for any Media is suitable.

According to the invention this is achieved by the features of claim 1. Advantageous design features are the subject of the dependent claims.

Erindungsgemäß thus consists of the receiving part of two receiving the opening coaxially enclosing parts, namely an outer base part and disposed therein, at least the holding means having inner part, wherein the inner part is axially movable relative to the base part between a first position and a second position and thereby cooperates with the base part such that, in the first position, the insertion portion can be inserted and removed from the receiving opening in a substantially non-contact and frictionless manner through the area of the retaining means, and only in the position opposite the first position plugging direction offset second position, the holding means are brought radially into engagement against the peripheral surface of the Einsteckabschnittes. This is achieved by a corresponding, radially narrowing inner contour of the base part and / or by a widening outer contour of the inner part.

By this advantageous embodiment, it is actually arbitrary, to which point the sealing means are arranged relative to the holding means are. Even if the male portion with an end-side sealing area through the holding means is damage to it the outer peripheral surface avoided, because the holding means during insertion the Einsteckabschnittes are not yet in the engaged position, but only radially brought into engagement by axial movement of the inner part, d. H. "Activated" in this Movement takes place advantageously but no axial relative movement more between the male and female parts.

By the embodiment of the invention results In addition, the advantageous possibility to use the inner part as a plug-in control element by the second Position is visually recognizable as the correct insertion position from the outside. This is useful if the inner part in the second position with its outer, opposite the insertion of the base part pioneering end face in Essentially flush in one of a mouth-side, the receiving opening enclosing surface the base part defined level lies.

In further advantageous embodiment of the invention, the inner part additionally also the sealant and thus interacts with the base part, that in the first position of the insertion also substantially frictionless or at least low friction through the area of the sealant in the receiving opening insertable or from this is removable and in the second position, the sealant radially against the peripheral surface pressed the plug-in section become. This too is achieved by a correspondingly narrowing inner contour the base part and / or by an expanding outer contour of the inner part reached. Thus, the sealant only by transferring the Internally to its second position "activated." This can be beneficial in essence at the same time or in approximately the same position of the inner part, in which also takes the intervention or activation of the holding means. Thereby realized the connector according to the invention a basically new principle "simultaneous Holding and sealing ". Advantageously, the inner part then also shows as a plug-in indicator the correct sealing position.

The Receiving part can in a further advantageous embodiment of the invention be formed in the region of the inner part so that it is optional both to accommodate a complete cylindrical, smooth-walled pipe end as well as for receiving a pipe section with a radially outward protruding, bead-shaped Ring approach (so-called SAE plug) is suitable. This is indicated by the inner part in its mouth side End area an additional receiving section for one radial, bead-like annular projection of the insertion portion, wherein this receiving portion in the first position of the inner part axially for insertion open the ring approach is and in the second position, the annular shoulder axially and radially encloses. If this is an outside completely smooth-walled Inserted plugged without ring approach, so this is also easily possible, by adding the extra Recording section remains unused or functionless.

Based a illustrated in the drawing, preferred embodiment the invention will be explained in more detail below. Showing:

1 an exploded perspective view of a connector according to the invention with the base part and inner part and with an exemplary representation of a plug-in with outer ring approach (SAE plug),

2 an enlarged axial section in the diametrical axial plane XX according to 1 the connector in the first position of the inner part together with a plug-in according to 1 .

3 an axial section in the plane perpendicular to the plane XX axial plane YY according to 2 with an exemplary representation of an externally completely cylindrical insertion section,

4 an axial section in the plane XX as in 2 with inserted plug-in section,

5 an axial section in the situation according to 4 but in the section plane YY,

6 a section enlargement of the area VI in 5 .

6a a detail from 6 in an alternative embodiment,

7 a view like in 4 in an intermediate position during the insertion process,

8th a view like in 5 in the intermediate position according to 7 , but with a plug-in section after 3 .

9 u. 10 Views like in 4 and 5 in a slightly "overmold" position,

11 u. 12 Depictions like in 9 and 10 in the actual, locked and sealed insertion situation,

13 a detail enlargement of the area XIII in 12 .

14 u. 15 Representations analogous to 11 and 12 , but with a plug-in section after 3 respectively. 8th .

16 a view analogous to 11 to explain the dissolution process,

17 an axial section of the base part,

18 an axial section of an additional locking element,

19 an axial section in the assembled or interconnected state of the base part according to 17 and locking element according to 18 .

20 a separate axial section of the inner part in the plane XX and

21 an axial section of the inner part in the plane YY.

In the different figures of the drawing are the same parts always provided with the same reference numerals. Therefore, every description applies a particular part with reference to only a part of the drawing figures analogous for all other drawing figures in which the part with the corresponding Reference sign can also be seen.

An inventive connector 1 is used for quick and detachable, locked and sealed plug connection of a media line 2 , which may be a pipe or a relatively dimensionally stable hose, in particular made of plastic. The connector 1 consists of a receiving part 4 with a receiving opening 6 for a line-side insertion section 8th , The insertion section 8th can be used as an end piece integral with the media line 2 designed or as a separate item via suitable connection means with the media line 2 be connected. In any case, the insertion section 8th at least partially a cylindrical, "smooth" peripheral surface 10 on.

The connector 1 or the receiving part 4 points in the area of the receiving opening 6 on the one hand holding means 12 and on the other hand, sealant 14 on, with both the holding means 12 as well as the sealants 14 for locking or sealing against the outer peripheral surface 10 of the insertion section 8th Act.

The connector 1 is designed such that it optionally for receiving an externally completely cylindrical insertion portion 8th (see also 3 . 8th . 14 and 15 ), but also for receiving a Einsteckabschnittes 8th with an outer, radial, bead-like annular projection 16 is suitable (see the 1 . 2 . 4 . 5 . 7 . 9 to 12 such as 16 ).

According to the invention it is now provided that the receiving part 4 at least two parts is formed and thus from (at least) two together the receiving opening 6 coaxially enclosing parts, namely an outer base part 18 and an inner part disposed therein 20 , As can be seen from the separate representations in 17 and 19 to 21 results, this is the actual receiving opening 6 having inner part 20 formed substantially hollow cylindrical or sleeve-shaped and in a corresponding opening 6a ( 1 . 17 . 19 ) of the base part 18 used. In this case, the inner part 20 at least the holding means 12 , but preferably also the sealant 14 on. The inner part 20 is according to the invention so axially relative to the base part 18 between a first position (see eg 2 and 3 ) and a second position ( 11 . 12 and 14 . 15 ) and acts in such a way with the base part 18 together that in the first position in the area of the holding means 12 there is a free inner cross-section which allows the insertion section 8th essentially non-contact and thus also friction-free through the area of the holding means 12 in the receiving opening 8th introduce (or remove it from the release), while only in the opposite direction to the first position in the insertion direction (arrows 22 ) offset second position the holding means 12 radially inwardly for engagement against the peripheral surface 10 of the insertion section 8th to be brought. This is done by a corresponding, narrowing inner contour of the base part 18 achieved, eliminating the inner part 20 in the area of the holding means 12 is forced radially inwards (narrows). This can be easily understood on the basis of the drawing figures. During the axial movement of the inner part 20 occurs advantageously no axial relative movement of the insertion 8th in the receiving opening 8th of the inner part 20 on.

In the illustrated preferred embodiment, in which the inner part 20 in addition, the sealant 14 has, the inner part acts 20 in the field of sealants 14 such with the base part 18 together, that in the first position of the insertion section 8th also by a corresponding free inner cross section, the only slightly larger, about the same or only slightly smaller than the cross section of the peripheral surface 10 is substantially frictionless or at least low friction through the range of sealants 14 in the receiving opening 6 insertable (or removable from this when releasing) is and only in the second position, the sealant 14 radially against the peripheral surface 10 of the insertion section 8th be pressed. This too is achieved by a corresponding, narrowing inner contour of the base part 18 achieved (see, for example, the 2 and 7 ). Thus, it is preferred by the transfer of the inner part 20 from its first position to its second position simultaneously the holding means 12 and the sealants 14 "activated", ie in their against the peripheral surface 10 of the insertion section 8th acting engagement position or sealing position brought. This leads to the new functional principle "simultaneous holding and sealing".

It is advantageous for the desired ease of use, when the inner part 20 by means of the insertion section 8th by the axial movement between its two positions is movable. On the one hand there is a transfer from the first to the second position by the insertion of the insertion 8th , including the inner part 20 at its pointing into the base part in the end a radially inwardly projecting collar 24 as a stop for driving by conditioning the front end 26 of the insertion section 8th on. When releasing a corresponding entrainment of the inner part takes place 20 at a pulling movement of the insertion 8th by non-positive and / or positive connection between the insertion 8th and the holding or sealing means 12 . 14 ,

But this is advantageously provided that the inner part 20 relative to the base part 18 by a latching device 28 in each of its two positions positively or positively locked against axial movement. The locking device 28 is in this case designed such that in the first position in the insertion direction 22 Seen a form-locking locking is present, so that this latching in the manner of a snap connection for transferring into the second position can be canceled, while in the second position in the release direction (arrows 30 in 11 and 12 ) a positive locking is present. As a result, an automatic release is avoided. However, the positive locking can be canceled by a manually imposed release movement. In the illustrated, preferred embodiment has the locking device 28 an outside on a sleeve section 32 of the base part 18 seated locking element 34 on (see also the separate representation in 18 ), which with at least one locking element 36 radially an opening 38 of the sleeve section 32 passes through (see in particular 17 to 19 ) and with corresponding locking recesses 40 of the inner part 20 cooperates (see 20 and 21 in connection with z. B. 2 and 9 ).

As can be seen in particular 18 results, there is the locking element 34 from an annular, the base part 18 or its sleeve section 32 Coaxially enclosing support section 42 (see also eg. 1 and 2 ) And at least one, in the illustrated embodiment, but four radially resilient, axially in the insertion direction 22 extending holding arms 44 , Which at their free, radially movable ends in each case a latching element 36 exhibit. The holding arms 44 with the locking elements 36 are preferably arranged in a radially symmetrical circumferential distribution.

As will continue in particular from 17 and 18 results, has each locking element 36 aligned on its two opposite axial sides and with corresponding, within the associated radial opening 38 of the base part 18 existing opening areas 46 . 48 cooperating bevels 50 . 52 on that in the locked state (see. 11 and 14 On the one hand, a movement of the inner part 20 in the release direction 30 is positively locked by undercut and on the other hand, upon movement of the inner part 20 from the first position ( 4 . 5 ) in the insertion direction 22 in the second position, the locking elements 36 automatically spring-elastically displaced radially outwards (see in particular 7 and 8th ). The inclined surfaces 50 . 52 proceed according to 18 and 19 starting from the respective holding arm 44 obliquely radially inward and opposite to the insertion direction 22 , so barb-like obliquely in the release direction 30 , The closing in the direction of release 30 pointing inclined surfaces 50 and the associated opening areas 46 with the thru axle 54 an angle α ₁ preferably in the range of 60 ° to 70 °. The opposite, in the insertion direction 22 pointing inclined surfaces 52 and the corresponding opening areas 48 close with the thru axle 54 an angle α ₂ preferably in the range of 30 ° to 40 °. According to 19 thus engages each locking element 36 barbed in the associated opening 38 one. It is to release the Einsteckabschnittes 8th the locking element 34 on the base part 18 axially movable, so that upon movement of the locking element 34 in the insertion direction 22 each locking element 36 due to the inclined surfaces 52 and the opening areas 48 to release the inner part 20 is urged radially outward. This process is in 16 illustrated.

The inventive design serves the inner part 20 Advantageously, as a means for plug-in control by optical display of its second position.

These are the inner part 20 and the remaining components adapted to one another such that the inner part 20 in the second position with its outer, in the release direction 30 from base part 18 groundbreaking end face 56 is substantially flush in a plane that from a mouth side, the receiving opening 6 enclosing surface 58 of the base part 18 is defined. This is in particular on the 11 . 12 and 14 . 15 referred, which also shows that preferably also the locking element 34 with its outer frontal ring surface 60 is in the locked position in this plane.

As can be seen in particular from the 1 . 20 and 21 shows, the inner part points 20 starting from its inner, into the base part 18 to be used initially a circumferentially continuous, hollow cylindrical sleeve section 62 and subsequently several, in particular four by axial slots 34 separate and thus radially movable arm sections 66 on. Here are the sealants 14 in the region of the sleeve section 62 and the holding means 12 in the area of the arm sections 66 arranged. The arm sections 66 are preferably formed radially symmetrical.

The sealants 14 consist in the illustrated, preferred embodiment of two axially spaced, annular bead-shaped circumferential seals 48 , As holding means 12 are preferably metallic, in the existing plastic part inside 20 embedded and with retaining edges 70 radially inwardly projecting inserts 72 intended. It can in each arm section 66 one of these inserts 72 be arranged. It is particularly indicated on the enlarged views in 6 and 13 pointed. The sealants 14 or the circumferential seals 68 are so integral as a one-piece plastic molding together with the inner part 20 formed such that when inserting the insertion 8th on the inner part 20 in the area of the federal government 24 applied insertion force F (see 6 ) about the sealant 14 also on the area of the holding means 12 is transmitted. This can be the inner part 20 be prepared with advantage in a two-component injection molding process. In this case, at least in certain areas of the circumference at least one additional insert element 74 (see again especially 6 ) in the material of the inner part 20 be embedded, which insert element 74 in the axial direction over the entire range of the sealant 14 extends and helps that the insertion force F is transmitted over this area, without causing damage or deformation. Thus, by investing the Einsteckabschnittes 8th on the inner waistband 24 the entire inner part 20 axially in the insertion direction 22 moved.

In 6a is still an alternative embodiment of the sealant 14 illustrated. Here is the inner part 20 in the field of sealants 14 from a particular approximately central Ringwandungsabschnitt 76 which integrally into the adjacent parts of the sleeve section 62 goes over and thereby serves to transfer the insertion force F. As a sealant 14 are here radially outside and inside lip-like sealing portions 78 intended.

For the usability of the connector already described above 1 for plug-in sections 8th with ring approach 16 has the inner part 20 in its mouth-side end an additional receiving section 80 for the radial ring approach 16 of the insertion section 8th on. Here is the receiving section 80 in the first position of the inner part 20 axially for insertion of the annular shoulder 16 opened (see eg 2 and 3 ) while the recording section 80 in the second position the ring approach 16 encloses axially and radially (see, in particular 11 and 12 ). This enclosing can be done with axial and / or radial play, because the actual locking of the insertion 8th over the holding means 12 by acting on the cylindrical Umfangsfäche 10 he follows. According to 20 and 21 is the recording section 80 of axial extensions 82 at least some of the Armabschhitte 66 of the inner part 20 educated. In the example shown have two diametrically opposite arm portions 66 in each case such an extension 82 on. The extensions 82 have on their facing inner sides radial recesses 84 for receiving the ring attachment 16 of the insertion section 8th on. The extensions 82 also act with a corresponding, narrowing in the insertion direction inner contour of the base part 18 together so that during the insertion process an inwardly directed radial movement of the extensions 82 for embracing the Einsteckabschittes 8th with the ring approach 16 is effected. The free ends of the extensions form 82 the already mentioned above, the plug control serving end face 56 of the inner part 20 ,

In 1 is the base part 18 in his with the locking element 34 connected state shown. In this case, the locking element 34 as originally separately manufactured in particular made of plastic item axially on the base part 18 be attached to (see this at the 17 and 18 the arrow 86 ). This assembly takes place under radial spreading of the support arms 44 until the locking elements 36 in the openings 38 of the base part 18 intervention. Alternatively, it is also possible with advantage, the base member 18 together with the locking element 34 in a plastic injection molding process, in particular in a multi-component injection molding process. For this purpose, first the base part 18 injected and immediately thereafter the locking element 34 one be sprayed.

The Invention is not limited to the illustrated and described embodiments limited, but includes also all the same in the context of the invention embodiments. Furthermore, the invention is not yet in the claim 1 defined feature combination limited, but can also by any other combination of certain features of all to be defined as a whole. This means, that basically practical each individual feature of claim 1 omitted or by at least replaced a single feature disclosed elsewhere in the application can be. In this sense, the claim 1 is only as a first Formulation trial for to understand an invention.

Claims (18)

Connector ( 1 ) to the locked and sealed plug-in connection of media lines ( 2 ), consisting of a receiving part ( 4 ) with a receiving opening ( 6 ) for a line-side, a cylindrical peripheral surface ( 10 ) having insertion section ( 8th ), wherein in the region of the receiving opening ( 6 ) Holding means ( 12 ) and sealants ( 14 ) are provided, which for locking or sealing against the peripheral surface ( 10 ) of the insertion section ( 8th ), characterized in that the receiving part ( 4 ) from two the receiving opening ( 6 ) coaxially enclosing parts, namely an outer base part ( 18 ) and arranged therein, the holding means ( 12 ) having inner part ( 20 ), wherein the inner part ( 20 ) so axially relative to the base part ( 18 ) is movable between a first and a second position and thereby with the base part ( 18 ) cooperates in that in the first position in the region of the holding means ( 12 ) is formed a free inner cross section which is greater than / equal to the outer cross section of the peripheral surface ( 10 ) of the insertion section ( 8th ) and in the direction opposite to the first position in the insertion direction ( 22 ) offset second position the holding means ( 12 ) radially inwardly for engagement against the peripheral surface ( 10 ) of the insertion section ( 8th ) to be brought. Connector according to claim 1, characterized in that the inner part ( 20 ) also the sealants ( 14 ) and in such a way with the base part ( 18 ) cooperates in that in the first position in the area of the sealant ( 14 ) is formed a free inner cross section which is greater than / equal to or only slightly smaller than the outer cross section of the peripheral surface ( 10 ) of the plug-in part ( 8th ), and in the second position the sealing means ( 14 ) radially inwardly against the peripheral surface ( 10 ) of the insertion section ( 8th ) are pressed. Connector according to claim 1 or 2, characterized in that the inner part ( 20 ) by means of the insertion section ( 8th ) is movable by its axial movement between its two positions. Connector according to one of claims 1 to 3, characterized in that the inner part ( 20 ) relative to the base part ( 18 ) by a latching device ( 28 ) is locked in each of its two positions form-fit or kraftformschlüssig against axial movement. Connector according to claim 4, characterized in that the latching device ( 28 ) is designed such that in the first position in the insertion direction ( 22 ) a frictionally locking and in the second position in the release direction ( 30 ) present a positive locking, wherein the positive locking can be canceled by a manually imposed release movement. Connector according to claim 4 or 5, characterized in that the latching device ( 28 ) on the outside of a sleeve section ( 32 ) of the base part ( 18 ) seated locking element ( 34 ), which with at least one latching element ( 36 ) radially an opening ( 38 ) of the sleeve section ( 32 ) and with corresponding locking recesses ( 40 ) of the inner part ( 20 ) cooperates. Connector according to claim 6, characterized in that the locking element ( 34 ) of a ring-shaped or sleeve-shaped, the base part ( 18 ) coaxially enclosing support section ( 42 ) and at least one radially resilient, axially in plug-in direction ( 22 ) extending and at its free, radially movable end of the locking element ( 36 ) holding arm ( 44 ) consists. Connector according to claim 7, characterized in that the locking element ( 34 ) in a preferably radially symmetrical circumferential distribution several, in particular four similar retaining arms ( 44 ) with associated locking elements ( 36 ) having. Connector according to one of claims 6 to 8, characterized in that the / each locking element ( 36 ) aligned on its two opposite axial sides and with corresponding, within the radial opening ( 38 ) of the base part ( 18 ) existing opening areas ( 46 . 48 ) co-operating inclined surfaces ( 50 . 52 ), that in the latched state, on the one hand a movement of the inner part ( 20 ) in the release direction ( 30 ) is positively locked and on the other hand, when moving in the insertion direction ( 22 ) the locking element ( 36 ) is displaced radially outward. Connector according to one of claims 6 to 9, characterized in that for releasing the Einsteckabschnittes ( 8th ) the locking element ( 34 ) on the base part ( 18 ) in plug-in direction ( 22 ) is movable, wherein the / each locking element ( 36 ) for releasing the inner part ( 20 ) is urged radially outward. Connector according to one of claims 1 to 10, characterized by means for plug-in control by in particular optical display of the second position of the inner part ( 20 ). Connector according to one of claims 1 to 11, characterized in that the inner part ( 20 ) in the second position with its outer, opposite to the insertion direction ( 22 ) from the base part ( 18 ) groundbreaking front page ( 56 ) substantially flush in one of a mouth side, the receiving opening ( 6 ) enclosing surface ( 58 ) of the base part ( 18 ) defined level lies. Connector according to one of claims 1 to 12, characterized in that the inner part ( 20 ) starting from its inner, into the base part ( 18 ) end first a circumferentially continuous, hollow cylindrical sleeve section ( 62 ) and then several, in particular four axial slots ( 64 ) separated and thereby radially movable arm sections ( 66 ), the sealing means ( 14 ), in particular in the form of at least one peripheral seal ( 68 ), in the region of the sleeve section ( 62 ) and the retaining means ( 12 ), in particular in the form of metallic, in the existing plastic part ( 20 embedded and with retaining edges ( 70 ) radially inwardly projecting inserts ( 72 ), in the area of the arm sections ( 66 ) are arranged. Connector according to one of claims 1 to 13, characterized in that the sealing means ( 14 ) so integral with the inner part ( 20 ) are formed such that one upon insertion of the Einsteckabschnittes ( 8th ) on the inner part ( 20 ) exerted insertion force (F) on the sealant ( 14 ) also on the area of the holding means ( 12 ) is transmitted. Connector according to one of claims 1 to 14, characterized in that the inner part ( 20 ) in an outlet end region an additional receiving section ( 80 ) for a radial, bead-like ring attachment ( 16 ) of the insertion section ( 8th ), wherein the receiving section ( 80 ) in the first position of the inner part ( 20 ) axially for insertion of the annular shoulder ( 16 ) is open and in the second position the ring approach ( 16 ) encloses axially and radially. Connector according to claim 15, characterized in that the receiving portion ( 80 ) of axial extensions ( 82 ) at least some of the arm portions ( 66 ) of the inner part ( 20 ), the extensions ( 82 ) on their insides radial recesses ( 84 ) for receiving the ring attachment ( 16 ) of the insertion section ( 8th ) exhibit. Connector according to one of claims 6 to 16, characterized in that the locking element ( 34 ) as originally separate, in particular made of plastic part axially on the base part ( 18 ) is attached. Connector according to one of claims 6 to 16, characterized in that the base part ( 18 ) together with the locking element ( 34 ) is molded in a plastic injection process, in particular in a multi-component injection process.