Abstract:
The disclosure relates to a quick connector for fluid lines, including: a connecting piece which is adapted to be plugged in a sealing fashion into a receiving opening of a counterpart and to be lockingly engaged, via a latch, with the counterpart, the quick connector having at least one support for supporting the connecting piece on the counterpart such that it is secured against tilting. In order to provide a certain mobility of the quick connector also in the condition of locking engagement, the support can be movable relative to the connecting piece.

Description:
[0001]    The present invention relates to a quick connector for fluid lines, comprising: a connecting piece which is adapted to be plugged in a sealing fashion into a receiving opening of a counterpart and to be lockingly engaged, via latching means, with the counterpart, the quick connector comprising at least one support means for supporting the connecting piece on the counterpart such that it is secured against tilting. 
         [0002]    Such a quick connector is known from DE 20 2005 016 966 U1 and WO 2007/042344 A1, respectively. In the case of this solution, the connecting piece is provided with radially projecting support surfaces for providing support against tilting in the receiving opening. According to this solution the connecting piece, when locked to the counterpart, is inevitably secured in position on the counterpart in a tilt-free manner. In order to allow connecting lines to be connected to or released from the quick connector, even in the locked condition, a certain mobility of the quick connector is, however, desirable. 
         [0003]    It is the object of the present invention to improve a quick connector of the type indicated at the outset such that, even in the locked condition, a certain mobility of the quick connector is allowed. 
         [0004]    The object of the present invention is achieved by a quick connector for fluid lines, comprising a connecting piece which is adapted to be plugged in a sealing fashion into a receiving opening of a counterpart and to be lockingly engaged, via latching means, with the counterpart, the quick connector comprising at least one support means for supporting the connecting piece on the counterpart such that it is secured against tilting, the support means being movable relative to the connecting piece. Making use of the latching means, the quick connector can be pre-mounted on the counterpart. In so doing, the support means is preferably held at a position of non-use at which the connecting piece is movable, and in particular tiltable, relative to the counterpart. Connecting lines can thus be connected to or released from the quick connector more effectively and more easily than in the case of the known solution. Only when the connecting lines have been mounted or demounted as intended, the support means will preferably be transferred to a position of use at which said support means supports the connecting piece on the counterpart such that it is secured against tilting. 
         [0005]    The latching means of the quick connector according to the present invention fulfills preferably at least one of the following requirements:
       The latching means comprises at least one latching arm which projects from the connecting piece and which extends substantially parallel to the connecting piece axis in a direction opposite to the direction of insertion, said latching arm being resilient in the radial direction.   The latching means comprises preferably two identical latching arms which are arranged on two diametrically opposed sides of the connecting piece.   The latching means, preferably each latching arm, comprises at least one wedge surface facing away from the connecting piece in the direction of insertion and at least one wedge surface facing away from the connecting piece in a direction opposite to the direction of insertion, the wedge surface facing away from the connecting piece in the direction of insertion defining with the axis of the connecting piece an angle that is smaller than the angle defined between said axis of the connecting piece and the wedge surface facing away from the connecting piece in a direction opposite to the direction of insertion, so that the force required for establishing a locking engagement between the latching means and the counterpart is smaller than the force required for releasing said locking engagement. The term wedge surface comprises any surface which is inclined relative to the axis of the connecting piece. Preferably, a wedge surface is configured as a section of the envelope of a cone and/or such that it has a convex curvature.   The latching means can be arranged fully within the receiving opening.       
 
         [0010]    Such a latching means proves to be particularly easy to mount. Due to the fact that the latching means can be arranged fully within the receiving opening, an inadvertent release of the latching means can be excluded to a large extent. In addition, the receiving opening can be closed and/or sealed more easily so as to prevent an ingress of dirt into the receiving opening. 
         [0011]    It may prove to be advantageous when the support means is held on the connecting piece such that it is movable along the axis of the connecting piece, preferably such that it is secured against rotation relative to the connecting piece. In an alternative embodiment the support means is held on the connecting piece such that it can be rotated thereon and is secured against displacement. Accidental operation of the support means is thus substantially excluded. 
         [0012]    It may prove to be useful when the support means is connected to the connecting piece such that it is captively, preferably non-releasably, secured thereto. The support means can surround the connecting piece in the circumferential direction at least sectionwise, preferably fully. The support means may, however, also comprise cup-shaped components which are adapted to be connected, or which are connected so as to form an annular arrangement around the connecting piece. The support means is e.g. configured such that it has a substantially U-shaped cross-section and that it is adapted to be placed on the connecting piece in locking engagement therewith. The risk that the support means detaches itself unintentionally from the quick connector can be reduced in this way. 
         [0013]    It may, however, also be of advantage when the support means is, in at least one position, adapted to be arrested relative to the connecting piece and/or the counterpart, and is preferably adapted to be frictionally and/or positively locked. The support means can thus be prevented from being unintentionally transferred to a different position. 
         [0014]    It proved to be particularly useful, when the support means is configured such that it will close the receiving opening, preferably in a sealing fashion. The receiving opening is preferably sealingly closed by the support means, when the support means supports the connecting piece on the counterpart such that it is secured against tilting. It is thus possible to prevent dirt from penetrating into the receiving opening and blocking e.g. the latching arms of the latching means. The support means is preferably configured substantially in the shape of a cover and comprises a circumferentially extending sealing means, which is adapted to be brought into sealing engagement the counterpart. 
         [0015]    According to an advantageous embodiment of the present invention, the support means comprises at least one support portion which fulfills at least one of the following requirements:
       The support portion is implemented as a flexible tongue.   The support portion is configured such that it is resilient in the radial direction to the axis of the connecting piece.   The support portion is adapted to be frictionally and/or positively engaged with the connecting piece and/or the counterpart, preferably in a locking fashion.   The support portion extends substantially parallel to the axis of the connecting piece, preferably in the direction of insertion.   The support portion comprises a sliding surface which faces the connecting piece and which is preferably in sliding engagement with said connecting piece, said sliding surface having preferably an inner contour that is adapted to the outer contour of the connecting piece.   The support portion comprises a support surface which faces away from the connecting piece and which is preferably configured as a cylinder jacket section, said support surface having an outer contour that is adapted to the inner contour of the receiving opening.   The support portion comprises a wedge surface which faces away from the connecting piece in the direction of insertion, said wedge surface defining preferably an acute angle with the axis of the connecting piece and being preferably configured as a section of the envelope of a cone.   The support portion comprises a locking means which is adapted to be brought into locking engagement with the counterpart, preferably a locking projection extending radially beyond the support surface, said locking means comprising preferably at least one wedge surface facing away from the connecting piece in the direction of insertion and at least one wedge surface facing away from the connecting piece in the direction opposite to the direction of insertion, the wedge surface facing away from the connecting piece in the direction of insertion defining a smaller angle with the axis of the connecting piece than the wedge surface facing away from the connecting piece in the direction opposite to the direction of insertion, so that the force required for establishing a locking engagement between the locking means and the counterpart is smaller than the force required for releasing the locking engagement.   The support portion comprises a stop which radially projects beyond the support surface and which limits the insertion depth of the support portion in the receiving opening of the counterpart.       
 
         [0025]    According to a particularly advantageous embodiment of the present invention, the support means comprises at least two support portions which fulfil at least one of the following requirements:
       The support portions are arranged at regular intervals around the circumference of the connecting piece.   The support portions are arranged around the axis of the connecting piece in a rotationally symmetric mode of arrangement.   The support portions are arranged on two diametrically opposed sides of the connecting piece.   The support portions are arranged between the latching arms.   The support portions have an identical structural design.       
 
         [0031]    According to a preferred embodiment of the present invention, the quick connector is provided with a safety means, which is adapted to be transferred between a safety position, at which the locking engagement between the latching means and the counterpart is secured against release, and a release position, at which the locking engagement can be released. The safety means fulfills preferably at least one of the following requirements:
       At the safety position, the safety means blocks a release movement of the latching means, preferably a radially inwards directed release movement of a latching arm of the latching means.   At the release position, the safety means allows a release movement of the latching means, preferably a radially inwards directed release movement of a latching arm of the latching means.   The safety means is held on the connecting piece such that it is axially movable thereon.   The safety means is held on the connecting piece such that it is secured against rotation relative thereto.   The safety means is adapted to be arrested in at least one position relative to the connecting piece and/or the counterpart, and is preferably adapted to be frictionally and/or positively locked.   The safety means is arrested on the connecting piece and/or the counterpart at the safety position and/or the release position, and is preferably frictionally and/or positively locked.   The safety means is arranged such that it can be displaced along the connecting piece.   The safety means is captively connected to the quick connector, preferably captively connected to the connecting piece.   The safety means is non-releasably connected to the quick connector, preferably non-releasably connected to the connecting piece.   The safety means circumferentially surrounds the connecting piece, at least sectionwise, preferably fully.   The safety means consists of substantially cup-shaped components which are connected so as to form an annular arrangement around the connecting piece.   The safety means is configured such that it has a substantially U-shaped cross-section and is adapted to be placed on the connecting piece in locking engagement therewith.   The safety means is adapted to be moved together with the support means relative to the connecting piece.       
 
         [0045]    It may be of advantage when the support means is adapted to be moved together with the safety means relative to the connecting piece, the support means supporting the connecting piece on the counterpart preferably such that it is secured against tilting, when the safety means occupies the safety position. 
         [0046]    It may be of advantage when the support means is preferably fixedly connected to the safety means, preferably such that one piece is defined, or formed integrally with said safety means. Preferably, the safety means and the support means define, in common, a slide which is movable relative to the connecting piece. This has the effect that the safety means and the support means can be operated much more easily. 
         [0047]    The object of the present invention is also achieved by a connection device comprising a quick connector for fluid lines and a connection counterpart with a receiving opening, said quick connector comprising: a connecting piece which is adapted to be plugged in a sealing fashion into a receiving opening of a counterpart and to be lockingly engaged, via latching means, with the counterpart, the quick connector comprising at least one support means for supporting the connecting piece on the counterpart such that it is secured against tilting, the support means being movable relative to the connecting piece. The connection device according to the present invention offers the above-mentioned advantages. 
         [0048]    It may of advantage that, when the latching means is in locking engagement with the counterpart, the support means is adapted to be transferred between a position of use, at which the support means supports the connecting piece on the counterpart such that it is secured against tilting, and a position of non-use, at which the connecting piece is adapted to be tilted relative to the counterpart. 
         [0049]    It may, however, also be of advantage to implement the support means such that, when it occupies the position of use, it is, at least in certain sections thereof, arranged in the receiving opening between the connecting piece and the counterpart and/or that it is arranged outside the receiving opening when it occupies the position of non-use. 
         [0050]    It may prove to be useful to implement the support means such that, at least when occupying one of its positions, it is adapted to be arrested relative to the connecting piece and/or the counterpart, and is preferably adapted to be locked by frictional and/or positive engagement, the support means being preferably locked on the counterpart when it occupies its position of use. 
         [0051]    It may be useful to implement the support means such that, when occupying its position of use, it bridges a distance between the connecting piece and the counterpart in the radial direction, preferably on diametrically opposed sides of the connecting piece, without any gaps being formed. 
         [0052]    It may be specially useful to implement the support means such that it closes the receiving opening preferably in a sealing fashion. In this way, the receiving opening can be prevented from getting dirty and blocking e.g. the latching means. 
         [0053]    Preferred embodiments of the present invention result from combinations of the features specified in the claims or in the description. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0054]      FIG. 1  shows a front view of the quick connector according to the present invention, in which the safety means is at the release position and the support means is at the position of non-use. 
           [0055]      FIG. 2  shows a sectional view of the quick connector according to the present invention along line II-II of  FIG. 1  in a sectional view of the connection device according to the present invention, the support means being at the position of use and bridging a gap between the connecting piece and the counterpart without any gaps being formed, so that the connecting piece is supported on the counterpart such that it is secured against tilting. 
           [0056]      FIG. 3  shows an alternative embodiment of the quick connector according to the present invention and of the connection device according to the present invention in accordance with  FIG. 2 . 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0057]    The preferred embodiment and the use of the invention will be explained hereinbelow in detail with reference to the drawings. 
         [0058]    The invention relates to a plug-in quick connector  1  used for fluid lines and configured as a leak oil plug. The quick connector  1  according to the present invention comprises a one-piece, substantially T-shaped body made of glass fibre reinforced plastic material (e.g. PA66+6 GF30 and polyamide 66+6 with 30% glass fibre) and comprising a connecting piece  2  and an upper part which extends transversely to said connecting piece  2 . The connecting piece  2  is adapted to be plugged in a sealing fashion into the receiving opening  3  of a counterpart  4 . Within the connecting piece  2  a branch line extends to the line extending between two conical connection members  8  in the upper part of the body. The line axis of the branch line, which will also be referred to as axis of the connecting piece  2  hereinbelow, defines with the axis of the line between the connection members  8  an angle of approx. 75°. Leak oil lines or connection lines to be connected are attachable to the connection members  8 . In the direction of insertion of the quick connector  1 , which is indicated by the arrow in  FIG. 1 , a sealing ring is held in a circumferentially extending groove on a cylindrical end of the connecting piece  2 . Above the cylindrical end piece of the connecting piece  2 , grooves  21 ,  22  are formed on the connecting piece  2 . 
         [0059]    The latching means comprises two identically implemented, resilient latching arms  5  which project from the connecting piece  2  on diametrically opposed sides of the connecting piece axis in a direction opposite to the direction of insertion and which are adapted to be lockingly engaged with the counterpart  4 . Each latching arm  5  is provided with a wedge surface  51  which is formed essentially at the free end of the latching arm  5  adjacent the largest radius of the latching arm  5  and which faces away from the connecting piece  2  in a direction opposite to the direction of insertion. The wedge surface  51  extends at an angle of approximately 45° to the connecting piece axis. A stop  54  is formed directly at the free end of the latching arm  5 . In addition, each latching arm  5  has on its outer side two wedge surfaces  52 ,  53  facing away from the connecting piece  2  in the direction of insertion, the wedge surface  52  being formed adjacent the largest radius of the latching arm  5  and the wedge surface  53  being formed immediately adjacent the cylindrical part of the connecting piece  2 . The wedge surfaces  52 ,  53  each extend at an angle of approx. 20° to the axis of the connecting piece  2 . In view of the different angles of inclination of the wedge surfaces  51  and  52  relative to the connecting piece axis, the force required for plugging the connecting piece  2  in is larger than the force required for pulling it out. The wedge surfaces  51 ,  52  and  53  have provided between them sliding surfaces  55  and  56  which extend substantially parallel to the connecting piece axis, the sliding surface  55  defining the largest radius of the latching arm  5 . An inner surface  57  of the latching arm  5  facing the connecting piece  2  is configured as a wedge surface, said wedge surface being continuously inclined relative to the connecting piece axis from the base point to the end of the latching arm  5 , preferably at an angle of approx. 10°. 
         [0060]    The safety means  6  and the support means  7  are formed integrally with one another in the present embodiment and define a slide which is slidable along the axis of the connecting piece  2  and which is supported on said connecting piece  2  such that it is secured against rotation relative thereto. The slide comprises two substantially cup-shaped components which annularly enclose the connecting piece  2  so that the slide is captively supported on the connecting piece  2 . For mounting the cup-shaped components, welding cams provided on one of the components are passed through complementary welding cam openings provided in the other component, and are then welded together so as to connect the two components positively and by a substance-to-substance bond. By displacing the slide on the connecting piece  2  in the direction of insertion or in a direction opposite to the direction of insertion, the safety means  6  is adapted to be moved between a release position, at which the locking engagement of the quick connector  1  is releasable, and a safety position, at which the locking engagement is guaranteed. Simultaneously, the support means  7  is adapted to be moved, by displacing the slide on the connecting piece  2 , between a position of non-use, at which the connecting piece  2  can be tilted relative to the counterpart  4 , and a position of use, at which the support means  7  supports the connecting piece  2  on the counterpart  4  such that it is secured against tilting. A projection on the inner side of the slide defines the latching means, which is complementary to the grooves  21 ,  22 , so as to hold the slide in locking engagement with the connecting piece  2 , when the safety means  6  preferably occupies the release position and/or the safety position and when the support means  7  occupies the position of non-use and/or the position of use. The fact that the safety means  6  and the support means  7  are formed integrally with one another offers the advantage that both said devices can be operated in common. The safety means  6  and the support means  7  may, however, also be implemented as functionally separate, independent devices. 
         [0061]    The safety means  6  comprises two identical wedge portions  61  which are arranged on opposed sides of the connecting piece  2  in correspondence with the respective positions of the latching arms  5  and which project from the slide substantially parallel to the axis of the connecting piece  2  in the direction of insertion. At the release position, the safety means  6  is not in engagement with the latching arms  5  so that the latching arms  5  can be displaced radially inwards. When the safety means  6  is transferred from the release position to the safety position, the safety means  6  cooperates via a wedge-type engagement with the latching arms  5  such that said latching arms  5  will symmetrically be spread from the connecting piece  2  to an increasing extent. Also at the safety position, the latching arms  5  are spread from the connecting piece  2 . The safety means  6  has on each wedge portion  61   a  wedge surface  62  which faces away from the connecting piece  2  in the direction of insertion and which is in wedge-type engagement with the latching arm  5  at the safety position. This wedge surface  62  does not have a constant inclination relative to the axis of the connecting piece  2 , but the degree of inclination increases from an end of the wedge portion  61  constituting the leading end when seen in the direction of insertion, in a direction opposite to said direction of insertion. This has the effect that the wedge portion  61 , i.e. the wedge surface  62  is concave in shape, i.e. it has a curvature, the radius of said curvature being between 1.0 mm and 15.0 mm, preferably between 2.0 mm and 10.0 mm, preferably approx. 5.0 mm. It is thus possible to achieve, with increasing insertion depth of the wedge portion  61  into the gap between the latching arms  5  and the connecting piece  2 , an increasing degree of spread per insertion depth. 
         [0062]    The support means  7  comprises two identical support portions  70  arranged on opposite sides of the connecting piece  2  between the wedge portions  61  of the safety means  6  and between the latching arms  5 , respectively, and projecting from the slide substantially parallel to the axis of the connecting piece  2  in the direction of insertion. On the side facing the connecting piece  2  each support portion  70  comprises a sliding surface, which is in sliding engagement with the connecting piece  2  and which has an inner contour that is adapted to the outer contour of the connecting piece  2 . Each support portion  70  comprises a convex support surface  71  which is implemented as a cylinder jacket section and which faces away from the connecting piece  2  and has an outer contour that is adapted to the inner contour of the receiving opening  3 . The radius of the support surface  71  or the distance of the support surface  71  to the axis of the connecting piece  2  is at least as large as the narrowest cross-section of the receiving opening  3  in the area of the undercut  41 . This has the effect that the support surface  71  abuts on the narrowest cross-section of the receiving opening  3  under preload, when the support means  7  is at its position of use and when the support portion  70  is arranged within the receiving opening  3 . At the end of the support portion  70  constituting the leading end in the direction of insertion, the support surface  71  is followed by a wedge surface  72  which faces away from the connecting piece  2  in the direction of insertion. The support surface  71  has formed thereon a bead-shaped locking projection  73  projecting outwards radially to the connecting piece axis beyond the support surface  71 . The locking projection  73  can be formed integrally with the support portion  70  or it may subsequently be formed on the latter making use of an elastic material. By means of the locking projection  73  the support portion  70  is lockingly secured in position on the counterpart  4  when it has overcome the narrowest cross-section of the receiving opening  3 . 
         [0063]    The support portions  70  of the support means  7  can be connected to the wedge portions  61  of the safety means  6  so as to define a ring that encloses the connecting piece  2 . Furthermore, the safety means  6  and/or the support means  7  may be configured for closing the receiving opening  3 , preferably in a sealing manner. The receiving opening  3  is, preferably sealingly, closed when the safety means  6  is at the safety position and/or when the support means  7  is at the position of use. 
         [0064]    The quick connector  1  may additionally comprise an indicator device which indicates the position occupied by the slide. This indicator device is preferably a coloured mark which is covered by the slide and thus not visible at a first position and which is exposed and, consequently, visible at a second position. 
         [0065]      FIG. 2  shows a sectional view of the quick connector  1  according to the present invention in accordance with  FIG. 1  in locking engagement with the counterpart  4 , the safety means  6  being at the safety position and the support means  7  being at the position of use. For identical components the same reference numerals as in  FIG. 1  will be used, and a renewed description is dispensed with. It can be seen that the support portions  70  are, sectionwise, accommodated in the receiving opening  3  so that, in the sectional view shown, they bridge the distance between the connecting piece  2  and the counterpart  4  in a radial direction on diametrically opposed sides of the connecting piece  2  without any gaps being formed, and clamp the connecting piece  2 . A detail X shows the condition of engagement between the support means  7  and the counterpart  4 . The geometry of the support portion  70  and, in particular, the geometry of the locking projection  73  are of such a nature that the force required for insertion into the receiving opening  3  is smaller than the force required for removal from the receiving opening  3 , an effect which is accomplished by wedge surfaces  73   a ,  73   b  facing away from the connecting piece  2  in the direction of insertion and opposite to the direction of insertion, the wedge surface  73   a  facing away from the connecting piece  2  in the direction of insertion defining preferably a smaller, i.e. more acute angle with the axis of the connecting piece  2  than the wedge surface  73   b  facing away from the connecting piece  2  in a direction opposite to the direction of insertion. 
         [0066]    The preferred use of the present invention is described hereinbelow in more detail with reference to the drawings. 
         [0067]    The quick connector  1  according to the present invention is plugged into the receiving opening  3  of the counterpart  4  in the direction of insertion, the slide being, in its upper position, locked in the groove  21  on the connecting piece  2 . The safety means  6  is now at the release position and the support means  7  at the position of non-use. During the insertion process, the connecting piece  2  is first centered in the receiving opening  3  via the latching-arm wedge surfaces  52 ,  53  facing away from the connecting piece  2  in the direction of insertion. When no force is applied in the direction of insertion (plug-in force), the wedge surfaces  52  facing away from the connecting piece  2  in the direction of insertion abut on the undercut  41 . By applying a plug-in force, the latching arms  5  cooperate with the undercut  41  by a wedge-type engagement so that they are displaced radially inwards so as to slide with the sliding surface  55  over the undercut  41 . Due to the resilient characteristics of the latching arms  5 , said latching arms  5  return to a position at which they project from the connecting piece  2  so that they lockingly engage behind the undercut  41 . The wedge surfaces  51  facing away from the connecting piece  2  in a direction opposite to the direction of insertion come into engagement with the undercut  41 , the stop  54  being located between the cylindrical part of the connecting piece  2  and the undercut  41  in the radial direction. The quick connector  1  is now in locking engagement with the counterpart  4 . 
         [0068]    The slide is now displaced on the connecting piece  2  in the direction of insertion from the upper position to the lower position. In the course of this movement the safety means  6  is transferred from the release position to the safety position and, simultaneously, the support means  7  is transferred from the position of non-use to the position of use. When the safety means  6  is being transferred from the release position to the safety position, the wedge surfaces  62  of the wedge portions  61  cooperate via a wedge-type engagement with the latching arms  5  such that, as the insertion depth increases, the latching arms  5  are symmetrically spread from the connecting piece  2  to an increasing extent and pushed deeper into the receiving opening  3  via a wedge-type engagement with the undercut  41 . 
         [0069]    Simultaneously with the transfer of the safety means  6  from the release position to the safety position, the support means  7  is transferred from the position of non-use to the position of use. In the course of this movement, the wedge surface  72  of the support portion  70  is introduced in the receiving opening  3  in the direction of insertion so that the connecting piece  2  is centered within said receiving opening  3  and the axis of the connecting piece  2  coincides with the axis of the receiving opening  3 . When the slide is now advanced still further into the receiving opening  3  in the direction of insertion, the locking projection  73  will come into contact with the narrowest cross-section of the receiving opening  3 , with the wedge surface  73   a  facing away from the connecting piece  2  in the direction of insertion first. This has the effect that the locking projection  73  is forced radially inwards until the slide can be passed through the narrowest cross-section of the receiving opening  3 . After having overcome the narrowest cross-section of the receiving opening  3 , the locking projection  73  reassumes its original shape due to the resilient resetting forces, so that the support means  7  will be in locking engagement with the counterpart  4 . In this condition, the connecting piece  2  is clamped between the support portions  70  and the receiving opening  3  is sealingly closed by the slide or the safety means  6  and/or the support means  7 . At the lower position of the slide, the projection on the inner side of the slide engages the groove  22  so that the slide is in locking engagement with the connecting piece  2  and is locked in position thereon. 
         [0070]    By displacing the slide on the connecting piece  2  in a direction opposite to the direction of insertion from the lower to the upper position, the safety means  6  can be retransferred from the safety position to the release position and the support means  7  can be retransferred from the position of use to the position of non-use. At the release position, the safety means  6  is not in engagement with the latching arms  5  so that said latching arms  5  can be displaced radially inwards. At the position of non-use, the support means  7  is not in engagement with the counterpart  4  so that, in the locked condition, the connecting piece  2  can be tilted relative to the counterpart  4 . By applying a force in a direction opposite to the direction of insertion (pull-out force), the quick connector  1  can be pulled out of the receiving opening  3 . At the release position of the safety means  6  and the position of non-use of the support means  7 , the projection on the inner side of the slide engages the groove  21  so that the slide is in locking engagement with the connecting piece  2  and locked thereon, respectively. The safety means  6  and the support means  7  are thus reversibly transferrable between the release position and the safety position and between the position of use and the position of non-use, respectively. 
         [0071]    An alternative embodiment of the invention is shown in  FIG. 3 . For identical components the same reference numerals as in  FIGS. 1 and 2  will be used, and a renewed description is dispensed with. A detail X shows the condition of engagement between the support means  7  and the counterpart  4 . Deviating from the embodiment according to  FIG. 2 , the support portions  70  are implemented as flexible tongues projecting in the direction of insertion. The support portions  70  implemented as flexible tongues are here deflected radially inwards when they overcome the narrowest cross-section of the receiving opening  3 , and they reassume their original shape when they have overcome said narrowest cross-section of the receiving opening  3 , so that the support means  7  is locked in position on the counterpart  4 .