A coupling device is provided having a female coupling engageable with a male coupling and a ring interposable between the couplings and provided with retaining means. A gasket is housed in the female coupling and held in position by the ring. The retaining means axially holds the ring to the female coupling and has two windows spaced apart in the circumferential direction over the body of the ring. The complementary retaining means of the female coupling has two lugs projecting from the tubular body constituting the female coupling. Each window houses an elastically deformable tongue having its free end co-operating with a longitudinal edge of the window to provide a housing within which one of the lugs becomes inserted in the engaged state of the female coupling and of the ring, and the retaining means holds the ring to the male coupling having two through openings arranged in the body of the ring and a locking member.

In a connector for a fluid line having a connector housing which has a fluid duct extending away from a first opening, a locking device having a locking housing and a locking element is provided in the region of the first opening. The locking housing encloses the connector housing with respect to the fluid duct such that an annular gap which is intended for receiving a substantially cylindrical connection piece is formed between the connector housing and the locking housing. The locking housing has a cutout through which the locking element projects into the annular gap by way of a respective holding portion.

A connector for connecting two fluid-conducting elements, in particular for connecting two motor vehicle pipelines, with a female plug-in part and a male plug-in part that can be plugged into the female plug-in part. The male plug-in part can be fixed on the female plug-in part via at least one fixing element. At least one indicator element is provided, which indicates the properly or completely fixed state of the male plug-in part which has been reached via the fixing element. When the male plug-in part is inserted into the female plug-in part, the indicator element is displaced outward in the radial direction. A radial outer position of the indicator element shows the properly fixed state of the male plug-in part on the female plug-in part.

A method for coupling plug connectors to form a plug assembly and a plug assembly is presented. A first and a second plug connector, a sealing element and a locking element are provided. The locking element is arranged in coupling slots of the first plug connector such that a base leg of the locking element is arranged in its center between its two legs in a first position spaced at a first radial distance from a first longitudinal axis. When the second plug connector is inserted into the first plug connector, first leg connection sections are supported on an insertion piece and subsequently second leg sections are supported on the widening section, and, in this process, the base leg is arranged in a second position spaced at a greater second radial distance from the longitudinal axis.

A connector for connecting two fluid-conducting elements, with a female plug-in part and a male plug-in part that can be inserted into the female plug-in part, wherein a retainer is hooked up to the female plug-in part, and can be used to fix the male plug-in part to the female plug-in part. The female plug-in part has at least one verification element, in particular in the form of a code, which in the unfixed state is unreadable or incomplete.

A coupling connector has a coupling body as well as a plug lock. The plug lock comprises a retainer and a verifier, wherein the plug lock can be inserted into the coupling body in a radial direction. The verifier has two legs and a back, wherein the ends of the legs facing away from the back are allocated to a bottom of the coupling body. If a coupling plug is inserted into the coupling connector, the plug lock is automatically transferred from a disengaged position into an engaged position. The coupling connector is designed in such a way that bottom-side ends of the legs retain their distance to each other while being deflected by the coupling plug.

A connector and a process for coupling a tube to another device is disclosed. The connector comprises a receptacle for receiving a first tube. The receptacle includes a socket and a modular head mated to said socket in one of a plurality of relative orientations. The modular head comprises an indexing member. A retention clip embraces the receptacle and has a leg positioned in a slot in the receptacle.

A connector and process for coupling a tube and the resulting assembly is disclosed. A receptacle includes pilot in a mounted position. The pilot is slidable from a mounting position to a final position while the pilot urges legs of a retention clip into a spread condition during a transition between the mounting position and the final position. In the final position, the pilot permits legs of the retention clip to retract to a relaxed condition and an indicator piece is visible.

A plug connector for hose and/or pipe connections. The connector includes a base body connected to a receiving body and each has a plug-in channel for a plug part. The connector further includes a retaining part arranged in a receiving opening of the receiving body that, in a locking position, blocks the plug part from being installed. The retaining part includes a stop surface (facing counter to the plug-in direction. The receiving opening has a abutment surface facing in the plug-in direction. During displacement of the retaining part against the plug-in direction, the stop surface acts against the abutment surface of the receiving body. The abutment surface is elastically displaceable against the plug-in direction, at least inside a displacing region. The receiving body has a resistance element which, during displacement of the abutment surface beyond the displacement region, resists further elastic deformation of the receiving body against the plug-in direction.

The invention relates to a plug assembly (1), in particular for use in a vehicle, comprising a tube (3), a sealing element (5) and a plug connector (4), which comprises a connector body (6), wherein the connector body (6) has an annulus (22) located between a first casing section (12) and a second casing section (15) of the plug connector (4), wherein a connection section (33) of the tube (3) is introduced into the annulus (22) of the connector body (6) and the sealing element (5) is arranged between the first casing section (12) and the connection section (33) of the tube (3). The first casing section (12) of the connector body (6) is deformed in such a way that an interlocking connection is established between a shaping region (56) of the first casing section (12) of the connector body (6) and the tube (3), wherein the sealing element (5) protrudes at least partially into the shaping region (56) of the first casing section (12), such that the sealing element (5) is clamped at least sectionally between the first casing section (12) and the tube (3).