Quick connection device, quick connection system and manufacturing method

Abstract

Quick-connect device (2) for generating an uninterrupted fluidic connection with a fluid line by connecting to an open fluid line end piece (3) of the fluid line having an undercut (10), wherein the quick-connect device (2) can be connected to the fluid line end piece (3) by movement along an insertion direction (E) and wherein the quick-connect device (2) has a holding device (6) designed to secure the quick-connect device (2) to the fluid line end piece (3), wherein the holding device (6) has two locking elements (7a, 7b), wherein the locking elements (7a, 7b) are each designed to engage the undercut (10) of the fluid line end piece (3) when moving from an unlocking position (EP) to a locking position (SP), so that disconnection of the continuous fluidic connection or separation of the quick-connect device (2) and the fluid line end piece (3) from each other is blocked, and wherein the quick-connect device (2) has a locking indicator (19) that can be moved automatically by means of the fluid line end piece (3) to visually signal that the fluid line end piece (3) has been secured against removal, characterized by that the locking elements (7a, 7b) are independently movable between the locking position (SP) and the unlocking position (EP) in a common locking plane (V) extending transversely to the insertion direction (E).

Description

[0001] The present invention relates to a quick-connect device according to the preamble of claim 1, a quick-connect system and a method for manufacturing a quick-connect device.

[0002] The present invention relates to a quick-connect device for generating an uninterrupted fluidic connection with a fluid line by connecting it to an open fluid line end piece having an undercut.

[0003] A quick-connect device according to the present invention is a structural element designed for preferably tool-free connection. Preferably, the quick-connect device is designed to hold, secure, and / or, in particular, connect a fluid line end piece in a fluid-tight manner. Specifically, it is a (hose) coupling of a push-fit system for creating a fluidic and / or mechanical connection by pushing it onto the fluid line end piece.

[0004] The quick-connect device is preferably designed to create an uninterrupted fluidic connection with a fluid line by connecting it to the open end of the fluid line, which has an undercut. The quick-connect device can be mechanically held to the end of the fluid line by means of the undercut and / or sealed against the end of the fluid line – for example, by one or more seals.

[0005] The quick-connect device is designed to establish a fluidic and / or mechanical connection in a simple and quick manner. In particular, it is part of a plug-in system, or the quick-connect device forms a plug-in system with the fluid line end piece. In a plug-in system, the parts, here the quick-connect device and the fluid line end piece, can be connected by plugging them in, preferably with only linear or axial movement.

[0006] In the context of the present invention, "connecting" preferably means creating a fluidic passage sealed to the environment and / or a mechanical connection for holding the quick-connect device to the fluid line end piece (or vice versa).

[0007] The "connection" as defined in the present invention preferably refers to the connection between a fluid line end (open pipe end) and another fluid line (e.g., hose). Thus, the quick-connect device is preferably an adapter for the fluidic and / or mechanical connection of identical or different fluid lines.

[0008] The quick-connect device allows the connection to be made preferably without twisting and / or without the need for additional parts, aids, or tools. It is therefore preferably a device for creating fluidic and / or mechanical connections without the need for aids or tools.

[0009] US Patent 5,052,725 A discloses a quick-connect fitting of this type. To connect a fluid line end to the quick-connect fitting, a locking element can be pressed down, allowing the fluid line end to be pushed into a designated receptacle in the locking element. After the fluid line end has been inserted sufficiently far, the locking element can be released, causing it to return to its original position due to preload. In doing so, the locking element engages in a groove in the fluid line end, thus securing the fluid line end against detachment from the quick-connect fitting.

[0010] It has been shown that the possibility of one-handed assembly, even in confined spaces, is advantageous for reliable operation. In this context, the need to actuate a locking element to establish a connection is a disadvantage. Furthermore, with previously known solutions, it is possible that the connection could be unintentionally released by accidental actuation of the locking element, for example, through contact with other components, which could lead to water damage. The same applies if the fluidic connection is inadvertently not fully established and may then release itself after an indefinite period of time.

[0011] DE 40 35 581 A1 relates to a quick-connect device with two locking parts. The locking parts are independently movable and engage in a locking groove of the pipe section to secure it.

[0012] German patent DE 10 2007 042 563 A1 relates to a quick-release coupling element for receiving a connection fitting, which has indicator elements that show whether the connection fitting is locked in place. Manually pivotable, elastically mounted levers extend from the quick-release coupling element and project into the inside of the receptacle to lock the connection fitting. The design is complex and not very robust; the risk of incorrect operation is high, and there is a risk of injury from the levers.

[0013] The present invention is based on the objective of providing a quick-connect device, a quick-connect system with a quick-connect device and a method for manufacturing a quick-connect device, wherein usability, reliability and / or application safety can be improved.

[0014] The above problem is solved by a quick-connect device according to claim 1, by a quick-connect system according to claim 9, or by a method for manufacturing a quick-connect device according to claim 10. Advantageous embodiments are the subject of the dependent claims.

[0015] The present invention relates to a quick-connect device for generating an uninterrupted fluidic connection with a fluid line by connecting it to an open fluid line end piece having an undercut.

[0016] The proposed quick-connect device preferably serves as an adapter, i.e., for connecting two, preferably different, fluid lines, e.g., for connecting different pipes, a pipe end with a hose, and / or hoses to each other. However, the quick-connect device can also be part of a fluid line or be designed to seal the fluid line end against fluid leakage. The quick-connect device can thus function as a blanking plug or form one. In this case, too, a fluid connection is preferably established, but it terminates in the quick-connect device. Alternatively or additionally, the quick-connect device can also form part of a fitting.

[0017] The quick-connect fitting can preferably be connected to the fluid line end by movement along an insertion direction. The "insertion direction" refers to the direction of relative movement of the quick-connect fitting to the fluid line end, by which the fluidic connection is established and / or by which the fluid line end can be held or secured to the quick-connect fitting. Thus, a relative movement of the connection between the fluid line end and the quick-connect fitting creates the connection. This can be achieved by inserting the fluid line end into the quick-connect fitting, or by inserting the quick-connect fitting into the fluid line end, or by including a wall of the fluid line end.The term “insertion direction” is therefore to be understood broadly in the context of the present invention, whereby “insertion” in particular means that the fluid line end piece is pushed into the quick-connect device in the insertion direction.

[0018] The quick-connect device comprises a housing and two locking elements. The locking elements include a locking section for securing a fluid line end against removal from the quick-connect device by engaging an undercut in the fluid line end, a guide section for guiding the locking elements against each other, and an actuating section and / or an actuating element for manually moving the locking elements.

[0019] Furthermore, the quick-connect device has a holding device designed to secure the quick-connect device to the fluid line end piece.

[0020] The holding device has two locking elements. The locking elements can be moved independently of each other between a locking position and an unlocking position in a common locking plane that runs transversely to the insertion direction.

[0021] The locking elements are each designed to engage the undercut of the fluid line end piece when moving from the unlocked position to the locked position. This prevents the continuous fluid connection from being disconnected or the quick-connect device and the fluid line end piece from separating.

[0022] Preferably, each locking element is movable between a locked position and an unlocked position. The separate movement of the locking elements ensures a secure and reliable hold of the fluid line end in the quick-connect device. Preferably, moving one of the locking elements does not move the other, thus preventing unintentional release of the locking mechanism, for example, by accidentally actuating or moving one of the locking elements.

[0023] The separately movable locking elements each have a locking section. Preferably, the quick-connect device is designed such that the locking elements in the respective locking section can engage behind an undercut of the fluid line end piece in the common locking plane extending transversely to the insertion direction.

[0024] The locking sections lie directly against the undercut of the fluid line end piece in their locking position, preferably with a surface, area, edge or the like.

[0025] The locking elements, in particular their edges or surfaces for contact with the undercut in the operating position, are therefore preferably movable within or along the same locking plane between the locking position and an unlocking position.

[0026] The interlocking mechanism creates a positive locking connection between the fluid line end and the quick-connect fitting. This prevents damage to the fluid line end that can occur when it is held in place by force or friction, for example, using retaining claws.

[0027] Furthermore, no tool is required for the positive locking of the fluid line end piece by engaging an undercut of the fluid line end piece with locking elements, which is the case, for example, with solutions that are based on a friction or force-fit connection and / or in which different parts are pressed together, for example with crimping pliers.

[0028] The common locking plane of the two locking elements ensures reliable retention and securing of the fluid line end. In particular, any force (water pressure, external tensile force) that would otherwise drive the quick-connect fitting and the fluid line end apart is distributed evenly across the locking elements. Furthermore, unwanted movement of the fluid line end relative to the quick-connect fitting is minimized or reduced. Specifically, potential torsional forces that could occur when attaching to axially offset sections of the fluid line end are avoided. This reduces material fatigue.

[0029] The movable locking elements allow for easy operation of the quick-connect device. In particular, no tools are required to secure or unlock the fluid line end; the locking elements can be manually operated and / or moved, e.g., by pressing down with a finger.

[0030] Preferably, by arranging only one of the locking elements in its locking position, the quick-connect device and the fluid line end piece are blocked or prevented from separating from each other.

[0031] The quick-connect device and the fluid line end piece are preferably separable. Separation preferably requires that the two locking elements are simultaneously in their unlocked positions. This prevents unintentional loosening of the connection.

[0032] Particularly preferred is the prevention of removal of the fluid line end piece or disconnection of the connection if only one of the two locking elements is in its locked position and / or if one of the locking elements is in its locked position and the other locking element is in its unlocked position. This prevents accidental or unintentional unlocking of the fluid line end piece, especially by accidentally moving or actuating one of the locking elements.

[0033] In particular, to remove the fluid line end, a user or operator of the quick-connect device or quick-connect system must actuate or move both locking elements. Typically and / or most easily, this is done by operating the quick-connect device or quick-connect system with two fingers, which is why the proposed quick-connect device is a so-called "two-finger system".

[0034] Securing the fluid line end in the quick-connect device or connecting the fluid line end to the quick-connect device in a fluid-tight manner is preferably done by inserting and / or sliding the fluid line end into the quick-connect device.

[0035] The quick-connect device is preferably designed to engage the undercut on the sides of the fluid line end piece opposite the insertion direction with the locking sections of the locking elements. This enables a uniform distribution and dissipation of force.

[0036] The locking elements are preferably automatically movable from the unlocked position to the locked position, particularly without manual operation of the locking elements, which facilitates simplified operation or simplified locking and / or unlocking of the fluid line end piece.

[0037] Preferably, the holding device for automatically moving the locking elements into their locking position has at least one reset device by which the locking elements are biased into their locking position or in the direction of their locking position.

[0038] The locking elements can preferably be moved simultaneously into their locking position if the undercut is located at the level of the locking elements or behind them in the insertion direction. This allows a secure connection to be made simultaneously by both, independent locking elements.

[0039] The locking elements preferably have ramps, wherein the locking elements can be automatically moved in the direction of their unlocking position by the action of the fluid line end piece in the insertion direction on the ramps.

[0040] The ramps are preferably arranged on the locking sections and, in particular, on a side facing away from or opposite a surface that rests against the fluid line end piece when the undercut is engaged, in the insertion direction. This makes it possible to establish a continuous fluid connection without manual or active movement of the locking elements by simply attaching the quick-connect device to the fluid line end piece. This is particularly advantageous when used in confined spaces.

[0041] The locking elements preferably have guide sections for guiding the locking elements against each other. The guide sections are preferably separate from and / or adjacent to the locking sections.

[0042] In this configuration, the locking sections preferably project beyond the guide sections along the insertion direction. Alternatively or additionally, a locking section of one of the locking elements engages with another of the locking elements. Particularly preferably, the locking elements engage reciprocally with each other. This allows the locking elements to be guided along one another and simultaneously have locking sections that are arranged and / or movable in the same locking plane.

[0043] Preferably, the locking elements are designed to be moved by the fluid line end transversely to the insertion direction, in particular in a direction pointing away from the fluid line end or radially with respect to the fluid line end, when a fluid line end is inserted into the quick-connect device.

[0044] This allows the locking elements to slide or be guided along one another transversely to the insertion direction, so that the locking sections lie in the same locking plane and are movable in the same locking plane. Furthermore, the locking sections or their surfaces, which bear against the fluid line end piece when engaging the undercut(s), preferably align with each other, particularly in the locking plane.

[0045] The locking plane preferably runs perpendicular to the insertion direction or to the axis of symmetry or longitudinal axis of the fluid line end piece connected or connectable to the quick-connect device. This axis of symmetry or longitudinal axis preferably corresponds to or runs along the insertion direction or vice versa.

[0046] The connection or the successful completion of the process for establishing the connection is preferably signaled by an optical signal and / or an acoustic signal.

[0047] The quick-connect device preferably has a locking indicator that can be moved automatically by means of the fluid line end piece to visually signal that the fluid line end piece has been secured against disconnection or removal. This indicator can be activated, and in particular moved, so that it becomes visible or concealed when or by inserting the pipe end piece into the quick-connect device.

[0048] Alternatively or additionally, the locking elements are designed to generate an audible acoustic signal when moving into the locking position, in order to indicate that the fluid line end has been secured against removal from the quick-connect device.

[0049] Particularly preferred is the optical signaling of a continuous fluidic connection and the acoustic signaling of a mechanical connection that holds the quick-connect device to the fluid line end piece.

[0050] The optical and / or acoustic signaling of the establishment of a fluidic connection between and / or the securing against separation of the fluid line end and the quick-connect device has the particular advantage that, even when used in confined areas, a user can reliably identify that the connection has been properly established, i.e., that a continuous fluidic connection or passage, sealed to the environment, has been formed like a channel, and that the fluid line end has been secured against separation at the quick-connect device.

[0051] This allows for simple and reliable operation of the quick-connect device. The user can easily check whether the fluid line end is secured in the quick-connect device. This prevents incorrect connection of the fluid line end or insertion of the fluid line end without mechanical locking.

[0052] The optical and / or acoustic signaling of the connection between the fluid line end piece and the quick-connect device, and the use of the chamfers, synergistically improve reliability when used in confined spaces, as assembly is made easier and successful assembly is possible even without a full view of the quick-connect device.

[0053] The optical and / or acoustic signaling of the establishment of a proper connection between the fluid line end piece and the quick-connect device also works synergistically with the separately implemented locking elements, because in cramped areas, due to insufficient visibility, one of the locking elements may be unintentionally activated, which can be detected by the signaling, even if, for example, only a side view of the quick-connect device is possible.

[0054] Another aspect of the present invention, which can also be implemented independently, relates to a quick-connect system with a proposed quick-connect device and a fluid line end piece.

[0055] The fluid line end piece has an undercut. This is formed in particular by a radially extending or circumferential bead or a radial, preferably circumferential, groove. However, more generally, other sections of the pipe end piece extending transversely to the insertion direction and with a surface normal pointing against the insertion direction can also be or form the undercut.

[0056] An “undercut” within the meaning of the present invention is therefore preferably a section of the pipe end piece extending transversely to the insertion direction and with a surface normal pointing in the opposite direction to the insertion direction.

[0057] The locking elements of the quick-connect device are each designed to engage behind the undercut in a common locking plane that runs transversely to the insertion direction of the fluid line end piece. This allows for a positive-locking, in particular snap-fit, connection between the quick-connect device and the fluid line end piece.

[0058] Overall, the aforementioned aspects, both individually and especially in combination, synergistically ensure fast, safe, reliable, and easy operation of the quick-connect device or quick-connect system. In particular, securing the fluid line end against removal and / or unlocking it for removal is facilitated.

[0059] Another aspect of the present invention, which can also be implemented independently, relates to a method for manufacturing a quick-connect device, particularly as proposed.

[0060] The method preferably comprises at least the following steps, preferably in the order given: a) Assembling the locking elements so that the guide sections of the locking elements are adjacent to each other and the locking sections of both locking elements run in a common locking plane. b) Inserting the compound locking elements transversely to the insertion direction into the housing. c) Securing the assembled locking elements against removal from the housing by connecting at least one of the locking elements to one of the actuating elements.

[0061] The proposed method enables simple, cost-effective, and rapid production. The reliable fastening process, completed in just a few steps, advantageously reduces the probability of errors and the amount of scrap.

[0062] A "fluid line end piece" is preferably a section at the end of a fluid line. It is, in particular, an open end through which a passage formed by the fluid line is accessible to fluid. The fluid line is, in particular, a pipe or a hose. The fluid line end piece is therefore preferably an open pipe and / or hose end. Alternatively or additionally, the fluid line end piece is a fitting, a connector, and / or a distributor for fluid lines, e.g., for pipes or hoses, or an end section thereof.

[0063] A "holding device" is preferably a device that preferably blocks or prevents the separation of the connection or the separation of the quick-connect device and the fluid line end piece by means of a positive locking or snap-fit ​​connection.

[0064] In other words, the holding device keeps the quick-connect fitting and the fluid line end piece together.

[0065] The term "undercut" is preferably to be understood as a surface that runs transversely to the insertion direction or axis of symmetry of the fluid line end piece and whose surface normal points opposite to the insertion direction, so that an engagement behind the undercut positively blocks / prevents or can block / prevent movement of the fluid line end piece relative to the quick-connect device opposite to the insertion direction.

[0066] A "locking section" within the meaning of the present invention is preferably a surface that is designed and arranged such that it blocks or prevents the separation of the quick-connect device and the fluid line end piece by engaging behind or within the undercut. The locking section preferably engages in a self-locking manner with the undercut, so that forces acting on the fluid line end piece against the insertion direction are dissipated through the undercut into contact with the locking section, for example, into a housing of the quick-connect device.

[0067] A "locking plane" within the meaning of the present invention is preferably a plane in which the locking elements have sections that are movable within this plane and, by their movement, engage behind the undercut. Preferably, the sections lying in the locking plane have surfaces for planar contact with the undercut. However, this is not mandatory, although preferred for receiving and dissipating forces.

[0068] A "disengagement position" is preferably a position of the locking element / locking section in which it does not engage with or come into contact with the undercut. In other words, the projections of the locking element / locking section and the undercut do not overlap in the insertion direction.

[0069] A "locking position" is the opposite, i.e., a position of the locking element / locking section in which it engages or comes into engagement with the undercut. In other words, the projections of the locking element / locking section and the undercut overlap in the insertion direction.

[0070] The aspects mentioned above, as well as other aspects and features arising from the requirements and the following description, can be implemented independently and in any combination.

[0071] Further advantages, features, properties and aspects of the present invention will become apparent from the claims and the following description of a preferred embodiment with reference to the drawings.

[0072] It shows: Fig. 1 a perspective view of a quick connection system with a fluid line end piece secured in a quick connection device; Fig. 2 a cut through the quick-connect system according to Fig. 1; Fig. 3 a perspective view of the rapid connection system according to Fig. 1, where the housing of the quick-connect device is hidden; Fig. 4 a side view of the quick connection system according to Fig. 3; Fig. 5 a front view of the quick-connect system according to Fig. 3, wherein the locking elements are positioned in their locking positions; Fig. 6 another front view of the quick-connect system according to Fig. 3, wherein the locking elements are positioned in their unlocked positions; Fig. 7 an exploded view of the two locking elements of the quick-connect device according to the Fig. 1 and Fig. 3; Fig. 8 a front view of the two interlocking locking elements according to Fig. 6; Fig. 9 a perspective view of an actuating element with return mechanisms; Fig. 10 a front view of the actuating element according to Fig. 8; Fig. 11 the housing of the quick-connect device according to Fig. 1; Fig. 12 a perspective view of a safety indicator for the visual signaling of a safety device securing the end of the fluid line against removal; and Fig. 13 a side view of the security indicator according to Fig. 12.

[0073] In the figures, which are sometimes not to scale and only schematic, the same reference symbols are used for the same or similar parts, achieving corresponding or comparable properties and advantages, even if a repeated description is omitted.

[0074] Fig. Figure 1 shows a quick connection system 1 with a quick connection device 2 and a fluid line end piece 3, wherein the fluid line end piece 3 is held in the quick connection device 2 and secured against removal.

[0075] In the example illustration according to Fig. 1. The fluid line end piece 3 can be inserted into the quick-connect device 2, in particular by sliding it in. For this purpose, the fluid line end piece 3 can be moved towards the quick-connect device 2 in an insertion direction E. The fluid line end piece 3 can be slid into the quick-connect device 2 in insertion direction E, or the quick-connect device 2 can be placed onto or slid onto the fluid line end piece 3 (along or against the insertion direction). This allows a continuous fluidic and / or mechanical connection between the fluid line end piece 3 and the quick-connect device 2 to be created.

[0076] The quick-connect device 2 preferably has a housing 4. In the illustrated example, the housing 4 has a feedthrough 5 or an opening for receiving the fluid line end piece 3. Through the feedthrough 5, the fluid line end piece 3 can be inserted and / or plugged into the quick-connect device 2 along an insertion direction E, preferably through the feedthrough 5 of the housing 4. However, other solutions are also possible.

[0077] The fluid line end piece 3 can be secured against removal from the quick-connect device 2. In particular, the quick-connect device 2 is designed to hold the fluid line end piece 3 – preferably by positive locking. Specifically, the quick-connect device 2 secures the fluid line end piece 3 against disconnection, removal, and / or removal from the quick-connect device 2.

[0078] The quick-connect device 2 or the housing 4 preferably has a connection section A for connecting a further fluid line end piece. Preferably, the connection section A is arranged on a side of the housing 4 facing away from the feedthrough 5.

[0079] The quick-connect device 2 can establish or form a continuous fluid connection or passage for liquids or gases between the fluid line end piece 3 and the connection section A or the further fluid line end piece.

[0080] The connection section A can be or include a fluid line connection device such as a hose nipple, a fitting, or other connector for establishing a fluid connection. The connection section A can be or include an adapter or hose nipple, particularly for corrugated tubing. The connection section A can be or include a tube with or without a structure on its outer circumferential surface. In this case, the connection section A preferably has radially extending alternating waves and valleys or ridges and grooves, preferably axially symmetrical about a central or symmetry axis of the connection section A. These can correspond to an (internal) surface structure of a hose and / or serve for its tight connection (not shown).

[0081] Preferably, the connection section A is designed for connecting a fluid line end piece that is designed differently from the fluid line end piece 3. The quick-connect device 2 adapts different fluid lines by creating a continuous fluidic and / or mechanical connection that is closed to the environment.

[0082] Preferably, the fluid line end piece 3 is an open end of a rigid pipe, whereas the further fluid line end piece, which is connected or connectable to the connection section A, is an end piece of a flexible hose, other pipe or other, different or similar, fluid line.

[0083] The quick-connect device 2 allows two fluid line ends to be connected in alignment and / or at right angles to each other. For this purpose, the connecting section A can be angled, as for example in Fig. 1 shown.

[0084] The fluid line end piece 3 is preferably round, at least substantially cylindrical, and / or rotationally symmetrical about a longitudinal axis L, and / or has a circular cross-section, particularly perpendicular to the longitudinal axis L. The longitudinal axis L preferably runs centrally along a channel formed by the fluid line end piece. Preferably, the fluid line end piece 3 has a cylindrical or cylindrical-shaped wall that delimits the channel.

[0085] The insertion direction E preferably runs parallel to the symmetry or longitudinal axis L of the fluid line end piece 3. In the illustration example, the insertion direction E and the symmetry or longitudinal axis L are superimposed and therefore identical.

[0086] Fig. Figure 2 shows a longitudinal section of the quick-connect system 1 in a plane that includes the insertion direction E and / or the longitudinal axis L of the fluid line end piece 3.

[0087] In Fig. 2 The fluid line end piece 3 is positively secured against removal in or on the quick-connect device 2. For this purpose, the quick-connect device 2 engages an undercut 10 of the fluid line end piece 3 with a holding device 6 to hold or secure it. In this way, the fluid line end piece 3 is locked in or on the quick-connect device 2.

[0088] The holding device 6 preferably enables the creation of a reversible connection. For this purpose, the holding device 6 can, on the one hand, block or prevent the separation of the fluid line end piece 3 from the quick-connect device 2, as shown in Fig. Figure 2 shows the connection. On the other hand, the holding device 6 can release the connection. For this purpose, the holding device 6 can disengage the locking mechanism, whereby the undercut 10 is no longer engaged. This release is preferably performed manually.

[0089] In the illustrated example, the holding device 6 has one locking element 7a and another locking element 7b, for a total of two locking elements 7a, 7b. However, there can also be more than two locking elements 7a, 7b.

[0090] The locking elements 7a, 7b of the holding device 6 are movable separately or independently of each other. It is therefore possible that only one of the locking elements 7a, 7b is moved, while the other locking element 7a, 7b does not change its position, and vice versa.

[0091] Each of the locking elements 7a, 7b is in a locking position SP (see Fig. 5) and in an EP unlocking position (see Fig. 6) positionable and / or movable between the locking position SP and the unlocking position EP, in particular linearly or in a straight line.

[0092] Furthermore, the holding device can have 6 actuating elements 8 for actuating the locking elements 7a, 7b. Preferably, each of the locking elements 7a, 7b is assigned an actuating element 8. In particular, each of the locking elements 7a, 7b has an actuating element 8. Preferably, each actuating element 8 is connected to each of the locking elements 7a, 7b, preferably positively and / or latching, or integrally formed with them.

[0093] The actuating elements 8 are designed to move the locking element 7a, 7b associated with each actuating element 8 by manually actuating an actuating surface that is accessible from the outside for manual actuation in the installed state. It is preferably provided that actuation of the respective actuating element 8 moves the locking element 7a, 7b associated with it into an unlocked position EP. A reset device 18 (see Fig. 9 and Fig. 10) can be provided to move or pre-tension the actuating element 8, together with the locking element 7a, 7b associated with or attached to it, into a locking position SP. Further properties and advantages of the actuating elements 8 will be described later with reference to the Fig. Explained in detail on pages 8ff.

[0094] The locking elements 7a and 7b are similar or identical in the illustration. They are arranged flush with the housing 4. They can be manually pressed into the housing 4. This moves the locking elements 7a and 7b into the unlocking position E to allow separation, i.e., to release the quick-connect device 2 and the fluid line end piece 3 from being pulled apart in the opposite direction of insertion E.

[0095] Preferably, each of the locking elements 7a, 7b has a locking section 9. In the illustration example according to Fig. 2. The locking sections are designed as flanks configured for latching engagement or have such flanks. However, other designs are also conceivable in principle, in which the locking sections 9 are designed to hold or fasten the fluid line end piece 3, so that an unintentional separation of the quick-connect device 2 from the fluid line end piece 3 is prevented.

[0096] The fluid line end piece 3 preferably has an undercut 10 which is in Fig. 2 is formed by a flank of a radially projecting bead. The undercut 10 can, however, also be formed by a groove, one or more depressions such as grooves, or one or more bulges. Preferably, the undercut 10 completely surrounds or encircles the fluid line end piece 3, but alternatively, it can also be provided incompletely, partially, or only sectionally circumferentially and / or axially (along the insertion direction E) offset or extended. Preferably, however, it consists of structures that are axially symmetrical or rotationally symmetrical with respect to the insertion direction E, such as one or more annular bead, annular grooves, rings, annular webs, or the like.

[0097] The undercut 10 is preferably accessible via the locking elements 7a, 7b to secure the fluid line end 3 to the quick-connect device 2. If the undercut 10 is formed by a groove, the locking elements 7a, 7b engage in this groove to secure the fluid line end 3 to the quick-connect device 2. In the illustrated example, the undercut 10 is formed by the flank of a bead.

[0098] The undercut 10 has a surface normal that is directed opposite to the insertion direction E. The locking elements 7a, 7b are designed to engage behind the undercut 10 when the locking elements 7a, 7b are moved from the unlocking position EP to the locking position SP (perpendicular to the surface normal). In this way, the fluid line end is held positively, in particular by a snap-fit, on the quick-connect device 2.

[0099] In other words, the locking elements 7a, 7b form latches or catches that engage behind the fluid line end piece 3, thereby holding the fluid line end piece 3 on or in the quick-connect device 2.

[0100] The locking elements 7a, 7b are designed in the area of ​​their locking sections 9 to engage behind the undercut 10 of the fluid line end piece 3 in a common locking plane V extending transversely – particularly preferably perpendicularly – to the insertion direction E. Preferably, the locking elements 7a, 7b – in particular the locking sections 9 – define the locking plane V.

[0101] In the locking plane V, the undercut 10 rests against the locking sections 9, at least when a force is applied to the fluid line end piece 3 in the opposite direction to the insertion direction E. In this way, the fluid line end piece 3 can be supported.

[0102] In the Fig. 3, Fig. 4, Fig. 5 and Fig. Figure 6 shows the quick connection system 1 in different views, with the housing 4 not shown for better understanding.

[0103] The direction in which the locking elements 7a, 7b are movable is also called the direction of movement B. The direction of movement B runs transversely, in particular perpendicularly, to the insertion direction E. The movement of the locking elements 7a, 7b is in particular rectilinear, linear and / or forward and backward, and / or is guided accordingly. Furthermore, the locking elements 7a, 7b are preferably movable relative to each other and / or, in particular simultaneously, in opposite directions.

[0104] The locking position SP is a position in which the locking element 7a, 7b or its locking section 9 engages behind the undercut 10. The unlocking position EP is preferably a position in which the locking element 7a, 7b or its locking section 9 does not engage behind the undercut 10 of the fluid line end piece 3. In the Fig. 3, Fig. 4 and Fig. 5 The locking elements 7a and 7b are each in their locking position SP. In Fig. 6 the locking elements 7a, 7b are each in their unlocked position EP.

[0105] Preferably, the unlocking position EP and the locking position SP are end positions of possible movements of the locking elements 7a, 7b, in particular along the direction of movement B. Preferably, the fluid line end piece 3 can be secured against removal by positioning at least one of the locking elements 7a, 7b in its locking position SP, preferably by engaging the undercut 10 with the locking section 9 of the locking element 7a, 7b.

[0106] Particularly preferably, the removal of the fluid line end piece 3 requires that the two locking elements 7a, 7b are simultaneously positioned in their unlocked positions EP. This prevents removal of the fluid line end piece 3 and / or ensures that the fluid line end piece 3 is secured in the quick-connect device 2 if only one of the locking elements 7a, 7b is in its unlocked position EP.

[0107] The locking elements 7a, 7b and / or their locking sections 9 for engaging behind the undercut 10 are preferably arranged on different and / or opposite sides of the fluid line end piece 3 with respect to the longitudinal axis or insertion direction E.

[0108] The following more detailed description of the holding device 6 and the securing elements 7a, 7b focuses in particular on the Fig. 7 and Fig. Reference is made to Figure 8, in which the locking elements 7a, 7b are shown for clarification without further parts of the quick-connect system 1 or the quick-connect device 2.

[0109] The locking elements 7a and 7b are similarly designed. Preferably, the locking sections 9 of the two locking elements 7a and 7b are identical.

[0110] The locking elements 7a, 7b are secured in or on the housing 4 against movement along, and in particular against, the insertion direction E. In the illustrated example, the locking elements 7a, 7b are guided in or through the housing 4. Here, the locking elements 7a, 7b are formed in a complementary fashion to the housing 4 such that the locking elements 7a, 7b are secured in the housing 4 against movement along, and in particular against, the insertion direction E.

[0111] The locking elements 7a, 7b each have at least one, preferably two, guide sections 11. In the illustrated example, the guide sections 11 adjoin different ends of the locking section 9. The guide sections 11, together with the locking section 9, can form at least substantially the shape of a large U or a closed shape.

[0112] In particular, the guide sections 11 of a locking element 7a, 7b and / or of two different locking elements 7a, 7b are arranged parallel to each other.

[0113] The guide sections 11 run or slide along one another to guide the locking elements 7a, 7b, or are designed to do so. These guide sections 11 particularly enable the locking elements 7a, 7b to slide linearly along one another.

[0114] In the illustration example, the guide sections 11 of two corresponding or complementary locking elements 7a, 7b are formed as corresponding or complementary sliding surfaces, which preferably run parallel to the locking plane V.

[0115] The guide sections 11 are preferably designed so that the locking elements 7a, 7b support each other in or against the insertion direction E. The guide sections 11 of each of the locking elements 7a, 7b are preferably provided adjacent to the locking section 9. In the installed state, the locking sections 9 together with the guide sections 11 encompass the fluid line end piece 3.

[0116] In the illustrated example, the locking elements 7a, 7b are symmetrical about a plane spanned by the insertion direction E and the direction of movement B. However, other solutions are also possible.

[0117] The respective locking section 9 preferably projects beyond the guide sections 11, particularly preferably along the insertion direction E. Particularly preferably, in one of the locking elements 7a, 7b, the locking section 9 projects beyond the guide sections 11 in the insertion direction E and / or the locking section 9 projects beyond the guide sections 11 of the other locking element 7a, 7b opposite the insertion direction E.

[0118] One or both of the locking elements 7a, 7b preferably have a ramp 12. In a particularly preferred embodiment, which is also shown in the figures, the respective locking element 7a, 7b has the ramp 12 on the locking section 9, preferably on a side facing away from the locking plane V.

[0119] The ramps 12 are designed to move the locking elements 7a, 7b into the unlocking position EP by the action of the fluid line end piece 3 or pressure on the ramps 12 in the insertion direction.

[0120] The ramps 12 are preferably arranged such that they narrow or taper the opening cross-section in the insertion direction E. The respective ramp 12, for example, forms an angle α of less than 40°, particularly preferably less than 30°, and / or more than 10°, particularly preferably more than 20°, with the insertion direction E.

[0121] The locking sections 9 are designed to engage with the fluid line end piece 3. For this purpose, the edges of the locking elements 7a, 7b extend on a side facing the fluid line end piece 3 at least partially complementary to a contour of the fluid line end piece 3, so that the fluid line end piece does not only contact the ramps 12 at a single point and / or the locking elements 7a, 7b do not only engage the undercut 10 at a single point. The contour of the edges is preferably a circular arc segment complementary to a tubular fluid line end piece 3. The contour can have a radius that corresponds at least substantially to the outer radius of the fluid line end piece 3. This facilitates easy connection and / or robust locking through large contact surfaces and good force distribution and dissipation.

[0122] Preferably, each of the locking elements 7a, 7b has an actuating section 13 on its side facing away from or opposite the locking section 9, which may be formed by the actuating element 8, preferably formed separately and preferably positively connected to the remaining locking element 7a, 7b.

[0123] Alternatively, it is possible that one of the locking elements 7a, 7b has an actuating section 13 formed integrally with or in one piece with the locking element 7a, 7b, while only the other of the locking elements 7a, 7b can be connected to or is connected with a separately realized actuating element 8.

[0124] The actuating section 13 preferably forms an outer surface of the quick-connect device 2. The actuating section 13 is an outer surface of the respective locking element 7a, 7b, which is moved / can be moved from its locking position SP to the unlocking position EP by manual pressure being applied in the actuating section 13.

[0125] The actuating sections 13 of the locking elements 7a, 7b are preferably arranged on opposite sides of the quick-connect device 2. The locking elements 7a, 7b can be moved towards each other in opposite directions or into the quick-connect device 2 by means of the actuating sections 13, thereby moving the locking elements 7a, 7b from their locking positions SP to their unlocking positions EP.

[0126] Preferably, the actuating section 13 or the actuating element 8 projects beyond the locking elements 7a, 7b, or at least the guide sections 11, along the insertion direction E. This allows the locking elements 7a, 7b to be covered and / or secured against falling out of the housing 4.

[0127] Preferably, the actuating section 13, the locking section 9 and the guide sections 11 form a self-contained structure with an opening for the passage of the fluid line end piece 3. In particular, the respective locking element 7a, 7b is formed in a ring shape with the locking section 9, the guide sections 11 and the actuating section 13.

[0128] The guide sections 11 together with the part of the locking elements 7a, 7b forming the locking section 9 can form a U-shaped structure, which is completed to a closed or ring-like form by attaching the actuating element 8.

[0129] As a result, the locking elements 7a, 7b in their operating position are preferably ring-shaped closed elements that abut each other, are slidable along each other, and engage laterally. The fluid line end piece 3 can pass through both locking elements 7a, 7b or through the ring formed by each locking element 7a, 7b.

[0130] Preferably the housing 4 and the locking element(s) 7a, 7b are complementary to each other, such that the locking elements 7a, 7b are guided in the housing 4 transversely or perpendicularly to the insertion direction E.

[0131] In the illustrated example, the locking elements 7a, 7b have a guide element 14, which is designed to be complementary to a corresponding section of the housing 4. The guide element 14 can be a projecting element, in particular one that corresponds to or is designed to be complementary to a recess, e.g., a guide rail, of the housing 4. It is therefore possible that the housing 4 has guide elements 14 and that the locking elements 7a, 7b have corresponding guide elements 14 such as recesses, indentations, or guide rails.

[0132] Preferably the locking elements 7a, 7b interlock and / or the locking elements 7a, 7b are guided together in the direction of movement B.

[0133] In the illustrated example, the locking section 9 of one of the locking elements 7a, 7b is located at or adjacent to the guide sections 11 of the other locking element 7a, 7b, in particular on the inside and / or transversely to the insertion direction E. However, other solutions are also possible here.

[0134] At least one of the locking elements 7a, 7b, but preferably both locking elements 7a, 7b, are multi-part. The actuating element 8 is initially separate from the other locking element 7a, 7b and can be connected to it during assembly, so that the locking element(s) 7a, 7b are formed from the actuating element 8 and a second part, the second part comprising or forming the locking section 9. The two-part design of the locking elements 7a, 7b offers the advantage of simple and reliable assembly.

[0135] For assembly, the interlocking locking elements 7a, 7b are preferably inserted transversely to the insertion direction E into the housing. More preferably, the locking elements 7a, 7b are held in the housing 4 by means of an actuating element 8.

[0136] The actuating element 8 is preferably positively and / or force-fit, in particular latching, connectable to the remaining locking element 7a, 7b. In particular, the actuating element 8 is connectable to the open ends of the guide sections 11. For this purpose, the guide sections 11 may have fastening devices at their ends that correspond to fastening devices of the actuating elements 8. These fastening devices are preferably designed for latching or clipping the actuating elements 8.

[0137] In particular, the guide sections 11 and the actuating sections 13 for positive locking connection of the locking element 7a, 7b with the actuating element 8 have locking means such as locking recesses 15 and locking projections 16.

[0138] In the illustrated example, the detent recesses 15 are arranged on the outer or end face of the locking element 7a, 7b and on one of the actuating elements 8 opposite the actuating sections 13. The actuating element 8 has detent projections 16 that are complementary to the detent recesses 15.

[0139] If only one separately implemented actuating element 8 is provided, it is of course also possible that the locking elements 7a, 7b do not have detent recesses 15. In addition, a reverse arrangement is possible, that is, it is also possible that the actuating element 8 has detent recesses 15 and the locking element has complementary detent projections 16.

[0140] The following description of the actuating element 8 or the actuating elements 8 focuses primarily on the Fig. 9 and Fig. Reference is made to Figure 10, in which the actuating element 8 is shown in different views.

[0141] The actuating element 8 is designed to move the locking elements 7a, 7b.

[0142] Furthermore, for the manufacture of the quick-connect device 2, it is advantageous that at least one actuating element 8 is structurally separate from the locking elements 7a, 7b. In the illustrated example, each locking element 7a, 7b is assigned an actuating element 8, so that the quick-connect device 2 has two actuating elements 8.

[0143] Preferably, the actuating element 8 holds the locking element 7a, 7b in the housing 4. For this purpose, the actuating elements 8 are arranged in actuating openings 17 provided for this purpose in the housing 4, which is particularly advantageous in Fig. Figure 1 shows the actuating elements 8. The actuating elements 8 cover housing parts so that the actuating elements 8 cannot slide into or through the housing 4.

[0144] Preferably, the actuating elements 8 are flush with the actuating openings 17 of the housing, especially when the locking element 7a, 7b associated with the actuating element 8 or the locking element 7a, 7b connected to the actuating element 8 is positioned in its locking position SP.

[0145] The locking element 7a, 7b can be moved in the direction of the unlocking position EP by moving, e.g. by pressing down or pushing in the actuating element 8 into the actuating opening 17 and / or moved from its locking position SP to its unlocking position EP.

[0146] The holding device 6 preferably has at least one, and more preferably two or four, reset devices 18. The reset device 18 is designed to move the locking elements 7a, 7b into their locking position SP or in the direction of their locking position SP. Particularly preferably, the locking elements 7a, 7b can be pre-tensioned and / or pre-tensioned by the reset device 18 in the quick-connect device 2 into their locking position SP or in the direction of their locking position SP.

[0147] The resetting device 18 allows the locking elements 7a, 7b to be automatically moved and / or positioned in their locking position SP by means of the resetting device 18. Manual operation of the locking elements 7a, 7b is not required for this, as the automatic movement of the locking elements 7a, 7b is effected or caused by the resetting device 18(s).

[0148] In the preferred embodiment shown in the figures, the actuating element 8 has two return devices 18, which in the example shown are designed as flexible tabs or leaf springs. Alternatively, the actuating element 8 can have only one or more than two return devices 18 and / or other clamping elements such as coil springs.

[0149] Alternatively or additionally, the locking elements 7a, 7b (instead of the actuating element 8) have the reset devices 18. Furthermore, it is also possible that the reset device 18 is arranged on the holding device 6. For example, a design using ring springs is conceivable here.

[0150] The locking elements 7a, 7b are preferably movable into their locking position SP when the undercut 10 is located behind the locking elements 7a, 7b in the insertion direction E. Preferably, the locking elements 7a, 7b are moved into or positioned in their locking position SP when the fluid line end piece 3 has been moved in the insertion direction E or inserted into the quick-connect device 2 to such an extent that the undercut 10 has passed the locking elements 7a, 7b.

[0151] The locking elements 7a, 7b are preferably automatically movable towards their unlocked position EP by the action of the fluid line end piece 3 in the insertion direction E on the ramps 12. Automatically means that no manual actuation of the locking elements 7a, 7b by a user (not shown) is required to move them towards their unlocked position EP.

[0152] The locking elements 7a, 7b are moved towards their unlocking position EP by sliding along the wall of the fluid line end piece 3 and / or the structure forming the undercut 10, preferably the bead, on the ramps 12 when the fluid line end piece 3 is inserted. For this purpose, the ramps 12 have an angle α that allows the fluid line end piece 3 or the undercut 10 to slide along the locking elements 7a, 7b, in particular the locking sections 9.

[0153] For this purpose, the angle α is chosen so that self-locking of the fluid line end piece 3 on the ramps 12 is prevented and / or the fluid line end piece 3 can be inserted into the quick-connect device 2.

[0154] Preferably, the fluid line end 3 can be secured in the quick-connect device 2, or, in particular, connected to the quick-connect device 2 in a fluid-tight manner, by, especially preferably exclusively, inserting the fluid line end 3 into the quick-connect device 2 in the insertion direction E. Here, "exclusively" means that, apart from inserting the fluid line end 3, no further actuation and / or operation of the quick-connect device 2 is required to secure the fluid line end 3 against removal.

[0155] Preferably, manual operation of the quick-connect device 2, in particular of the locking elements 7a, 7b and / or the actuating elements 8, is only required for unlocking and / or removing the fluid line end piece 3. Preferably, the removal or unlocking of the fluid line end piece 3 is not possible without, or only by, manually moving the locking elements 7a, 7b into their unlocked position EP, or by manually, in particular simultaneously, positioning the locking elements 7a, 7b in their unlocked positions EP, preferably by a user not shown in the figures.

[0156] It should be noted that it is also possible to design the locking elements 7a, 7b or the locking sections 9 without ramps 12. In this case, it may be necessary to move the locking elements 7a, 7b into their unlocked position EP by manual movement and / or to position them in their unlocked position EP.

[0157] The establishment of the fluidic connection and / or the securing of the fluid line end piece 3 against removal is / are preferably signaled visually and / or audibly. In particular, the visual signaling and the audible signaling can be implemented independently of each other, but are especially preferably implemented in combination.

[0158] The locking elements 7a, 7b are designed in one aspect to generate an acoustic signal, in particular a clack or click, when moved into the locking position SP, for example by impact, in order to signal that the fluid line end piece 3 has been secured against removal or that the undercut 10 has been engaged by the locking element(s) 7a, 7b. Preferably, the successful securing of the fluid line end piece 3 is thus signaled by the acoustic signal.

[0159] The locking elements 7a, 7b automatically move into their locking position SP as soon as the undercut 10 passes the locking elements 7a, 7b when the fluid line end piece 3 is inserted. The reset devices 18 then cause a rapid movement of the locking elements 7a, 7b into their locking position SP, so that the acoustic signal is generated when the locking elements 7a, 7b strike the fluid line end piece 3 and / or a designated section of the housing 4.

[0160] The optical signal is preferably provided by an optical safety indicator 19, as described in Fig. 12 and Fig. 13 is shown in different views. Preferably, the quick-connect device 2 has the locking indicator 19, which can be arranged at least substantially within the housing 4 of the quick-connect device 2, as is also shown in the Fig. 1 and Fig. 2. The quick-connect device 2 is preferably designed such that the optical locking indicator 19 changes the external appearance of the quick-connect device 2. In this way, a connection status of the connection between the fluid line end piece 3 and the quick-connect device 2, in particular a fluid connection and / or mechanical locking, can be signaled.

[0161] The safety indicator 19 has at least one signaling element 23, preferably two signaling elements 23. The safety indicator 19 is designed to move the signaling elements 23 when a connection is established, thereby signaling the connection status. In particular, the signaling elements 23, which are initially recessed in the housing 4, are pushed out of the housing 4 when a connection is established, or vice versa. However, other solutions for optical signaling are also possible.

[0162] The safety indicator 19 is preferably mechanically actuated by the fluid line end piece 3. The safety indicator 19 is preferably arranged in the insertion direction E behind a seal, in particular behind a sealing ring 25, and / or behind the locking plane V. This ensures that the optical signal is only generated when the continuous fluidic connection has been established.

[0163] It is desirable, but not mandatory, that the securing by means of the securing elements 7a, 7b precede or constitute a prerequisite for the complete optical signaling. It is therefore possible that the securing indicator 19 generates at least a partial optical signal, in particular is designed or is designed to do so when the fluidic connection has been established, but the fluid line end piece 3 is not yet secured to the quick-connect device 2.

[0164] The safety indicator 19 preferably forms a resilient arrangement, configured and designed such that the fluid line end piece 3 acts upon it when the connection is made, thereby generating the optical signal. The safety indicator 19 is preferably deformed by the fluid line end piece 3 in such a way as to generate the optical signal. Preferably, the safety indicator is resilient so that the optical signal disappears when the connection is broken.

[0165] In the illustrated example, the safety indicator 19 is manufactured as a single piece. Preferably, the safety indicator 19 is made of a flexible and / or elastic material, preferably a plastic. The safety indicator 19 is therefore preferably flexible and / or elastically deformable.

[0166] Preferably, the safety indicator 19 is arranged axially immovably in the housing 4. The safety indicator 19 is radially deformable, thereby enabling signaling.

[0167] In the illustrated example, the safety indicator 19 has a cross-section that is at least substantially rectangular and / or octahedral. However, the safety indicator 19 can also be ring-shaped or annular. Its main extent is preferably arranged perpendicular to the insertion direction E.

[0168] The safety indicator 19 can have several, preferably four, in particular identically designed and / or symmetrically arranged, connecting webs 20, as well as several, particularly preferably four, functional elements 21. The functional elements 21 are connected to each other by the connecting webs 20. The safety indicator 19 is held in the housing 4 of the quick-connect device 2 by the functional elements 21.

[0169] The functional elements 21 are preferably configured to generate movement and / or deformation of the safety indicator 19, particularly when the fluid line end piece 3 is inserted into the quick-connect device 2, and / or an optical signal. The functional elements 21 are therefore preferably configured differently, preferably with each pair of diametrically opposed functional elements 21 being of the same type or identical.

[0170] The safety indicator 19 preferably has a closed base shape that forms an opening through which the fluid line end piece 3 can be inserted. When the fluid line end piece 3 is moved in the insertion direction, it preferably displaces a section of the safety indicator 19, thereby generating the optical signal.

[0171] The safety indicator 19 is preferably moved or deformed by sliding along the wall and / or the undercut 10, preferably the bead, on the ramps 22 when the fluid line end piece 3 is inserted.

[0172] Preferably, the locking indicator 19 has a ramp 22. This ramp 22 is arranged such that when the fluid line end piece 3 is moved in the insertion direction E to establish the connection, it moves or deforms the locking indicator 19.

[0173] The signaling element 23 is preferably designed to indicate the connection status by moving out of or into the housing 4. This movement changes the appearance of the quick-connect device 2, thereby signaling the connection status. The signaling element 23 is preferably directly movable through the fluid line end piece 3 to generate the optical signal. The signaling element 23 can be cylindrical, dome-shaped, and / or in the form of a nipple, pin, or stud.

[0174] In the illustrated example, two opposing functional elements 21 each have a ramp 22 and / or a signal element 23. The signal element 23 is arranged radially outside the functional element 21. The ramp 22 is arranged radially inside the functional element 21. In this way, the ramp 22 allows the signal element 23 to be moved in a radially outward direction, causing it to project over or out of the housing 4 and thereby produce or generate the optical signal.

[0175] The signaling element(s) 23 can, however, alternatively or additionally be provided at other locations on the safety indicator 19. They can also perform a different movement to signal the connection status. In particular, they can be arranged on the functional elements 21 that are located between the functional elements 21 having the ramps 22. In this case, the signaling elements 23 can be moved radially inwards when the connection is made.

[0176] In the illustrated example, the ramps 22 are arranged such that they reduce the clear width in the insertion direction E and / or that the distance between the facing sides of the functional elements 21, which have the ramps 22, is reduced by the ramps 22 in the insertion direction E.

[0177] The ramps 22 are preferably designed to allow the fluid line end piece 3 to slide down them when inserted. The angle β formed by the ramp 22 with the insertion direction E is preferably less than 40°, preferably less than 30°, and / or more than 10°, preferably more than 20°.

[0178] The signal elements 23 are preferably arranged and / or movable in openings, perforations or bores provided for this purpose in the housing 4, as exemplified in Fig. 1. The signal elements 23 can be driven out of or into the housing 4 by the fluid line end piece 3. This changes the appearance of the quick-connect device 2, which provides the visual signal.

[0179] The safety indicator 19 completely surrounds the fluid line end piece 3, or rather, the safety indicator 19 forms an opening into which the fluid line end piece 3 can enter or through which the fluid line end piece 3 can pass. The safety indicator 19 is deformable, thereby deflecting the at least one signal element 23, preferably radially with respect to the insertion direction E or longitudinal axis L.

[0180] The safety indicator 19 is preferably deformable in such a way that, when the distance between two functional elements 21 arranged on opposite sides of the safety indicator 19 along a first imaginary axis is increased – for example by means of the ramps 22 – the distance between two other functional elements 21 arranged on a second imaginary axis, transverse or perpendicular to the first axis and also on opposite sides of the safety indicator 19, is increased and / or vice versa.

[0181] Once the fluid line end 3 has been secured, the signaling elements 23 may be positioned radially inwards to the insertion direction E, so far inside the housing 4 that they are not visible from the outside to an operator or user of the quick-connect device 2 or the quick-connect system 1 (not shown). In this case, the securing of the fluid line end 3 is visually indicated by the signaling elements 23 being invisible to the operator or user. In other words, the external appearance of the quick-connect device 2 changes when the connection is made.

[0182] However, the opposite is also possible, whereby the securing of the fluid line end piece 3 is visually indicated by the signaling elements 23 being visible to the operator or user. Here, too, the external appearance of the quick-connect device 2 changes when the connection is made. In this case, the signaling elements 23 are moved radially to the insertion direction E until they are visible to an operator or user of the quick-connect device 2 or the quick-connect system 1 from the outside, either inside or on the housing 4.

[0183] The first variant, i.e., signaling the safety mechanism by making the signal elements 23 invisible, can be implemented by a signal indicator 19, which according to the Fig. 12 and Fig. 13 is formed. In particular, in this embodiment, each functional element 21 has either a ramp 22 or a signal element 23, wherein the signal elements 23 and / or the ramps 22 are each arranged on opposite functional elements 21.

[0184] To implement the second variant, in which the successful securing of the fluid line end piece 3 is signaled by the visibility of the signal elements 23, it is advantageous that two functional elements 21 each have both a ramp 22 and a signal element 23. In this case, the two other functional elements 21 have neither a ramp 22 nor a signal element 23. In the second variant, it is also possible for the securing indicator 19 to have only two functional elements 21, preferably each of which has a ramp 22 and a signal element 23.

[0185] The signal elements 23 are pre-tensioned radially inwards or outwards – for example, by the connecting webs 20. This makes it possible to act on the signal elements 23 against the pre-tension when making the connection, thus changing the external appearance of the quick-connect device 2.

[0186] Preferably, the quick-connect device 2 is designed for fluid-tight connection of the fluid line end piece 3. This allows a continuous passage, like a channel, to be formed that is sealed off from the environment.

[0187] The quick-connect device 2 preferably includes a sealing device 24 for fluid-tight connection of the fluid line end piece 3. The sealing device 24 is particularly important in the Fig. 2, Fig. 3 and Fig. 4 to recognize.

[0188] The sealing device 24 is designed to connect the fluid line end piece 3 to a channel formed by the quick-connect device 2 in such a way that a continuous, uninterrupted fluid connection is established. For this purpose, the sealing device 24 can fully and tightly seal the fluid line end piece 3 from the inside and / or outside.

[0189] In the illustrated example, the sealing device 24 is arranged inside the housing 4. The sealing device 24 can be arranged between the fluid line end piece 3 and the housing 4. Furthermore, the sealing device 24 can be designed to seal gaps between the fluid line end piece 3 and the housing 4 in a fluid-tight manner.

[0190] The sealing device 24 preferably comprises or is formed by one or two sealing rings 25 and / or a spacer sleeve 26. The sealing rings 25 and / or the spacer sleeve 26 are ring-shaped. The sealing device 24 preferably forms an opening into which the fluid line end piece 3 can be inserted, thereby sealing one wall of the fluid line end piece 3 against the quick-connect device 2.

[0191] In the embodiment shown in the figures, the sealing rings 25 and the spacer sleeve 26 encompass the fluid line end piece 3 during and / or after it has been secured against removal. However, other design solutions are also possible, e.g., an arrangement of the sealing device 24 or the sealing ring 25 at the axial end of the fluid line end piece 3. In this case, the radius of the sealing ring 25 preferably corresponds to the radius of the fluid line end piece 3.

[0192] The present invention further relates to a method for manufacturing the quick-connect device 2 comprising the following steps, which are preferably carried out in the specified order, but another order is also possible. • Assembling the locking elements 7a, 7b, preferably so that the guide sections 11 of the locking elements 7a, 7b are guided to each other, and / or that the locking section 9 of one of the locking elements 7a, 7b, preferably on the inside, rests against guide sections 11 of the other of the locking elements 7a, 7b. • Arranging the assembled locking elements 7a, 7b by inserting them through the actuating opening 17 of the housing 4. In particular, the locking elements 7a, 7b are inserted transversely, and especially preferably perpendicularly, to the insertion direction E. • Arranging the compound locking elements 7a, 7b at least substantially within the housing 4. • Arrange at least one actuating element 8 in the actuating opening 17 of the housing 4 before or after the locking elements 7a, 7b have been inserted into the housing. The actuating element 8 may already be connected to, or be connected to, the corresponding locking element 7a, 7b. • Securing the compound locking elements 7a, 7b against removal from the housing 4, preferably by connecting at least one actuating element 8 with the corresponding locking element 7a, 7b - particularly preferably by connecting the second actuating element 8 with the other of the locking elements 7a, 7b - in particular by pressing together, hooking, clipping on or generally by creating a form-fit and / or force-fit and / or material-fit connection.

[0193] Different aspects of the present invention can be implemented independently of one another and in different combinations and can be advantageous, even if this is not explicitly mentioned. Reference symbol list: 1 Quick connection system 2 Quick-connect device 3 Fluid line end piece 4 cases 5 Implementation 6 Holding device 7a Safety element 7b Safety element 8 Actuating element 9 Security section 10 Undercut 11 Leadership section 12 Ramp (of the safety element) 13 Actuation section 14 Guide element 15 rest recesses 16 Rastvorsprung 17 Actuating opening 18 Reset device 19 Security indicator 20 Connecting bridge 21 Functional element 22 Ramp angle (of the safety indicator) 23 Signal element 24 Sealing device 25 sealing ring 26 Spacer sleeve A connection section B Direction of movement E Insertion direction EP unlocking position L Longitudinal axis SP safety position V locking level α angle β angle

Claims

[1] Quick-connect device (2) for generating an uninterrupted fluidic connection with a fluid line by connecting to an open fluid line end piece (3) of the fluid line having an undercut (10), wherein the quick-connect device (2) can be connected to the fluid line end piece (3) by movement along an insertion direction (E) and wherein the quick-connect device (2) has a holding device (6) designed to secure the quick-connect device (2) to the fluid line end piece (3), wherein the holding device (6) has two locking elements (7a, 7b), wherein the locking elements (7a, 7b) are each designed to engage the undercut (10) of the fluid line end piece (3) when moving from an unlocking position (EP) to a locking position (SP), so that disconnection of the continuous fluidic connection or separation of the quick-connect device (2) and the fluid line end piece (3) from each other is blocked, and wherein the quick-connect device (2) has a locking indicator (19) that can be moved automatically by means of the fluid line end piece (3) to visually signal that the fluid line end piece (3) has been secured against removal, characterized by , that the locking elements (7a, 7b) are each independently movable between the locking position (SP) and the unlocking position (EP) in a common locking plane (V) extending transversely to the insertion direction (E). [2] Quick-connect device according to claim 1, characterized by, that by arranging only one of the locking elements (7a, 7b) in its locking position (SP) a separation of the quick-connect device (2) and the fluid line end piece (3) from each other is blocked. [3] Quick-connect device according to claim 1 or 2, characterized by , that the quick-connect device (2) and the fluid line end piece (3) are separable from each other, the separation requiring that the two locking elements (7a, 7b) are simultaneously arranged in their unlocking positions (EP). [4] Quick-connect device according to any one of the preceding claims, characterized by , that the locking elements (7a, 7b) are designed to engage the undercut (10) on sides of the fluid line end piece (3) opposite the insertion direction (E) with locking sections (9). [5] Quick-connect device according to any one of the preceding claims, characterized by, that the locking elements (7a, 7b) can be moved automatically and / or simultaneously into their locking position (SP) when the undercut (10) in the insertion direction (E) is at the level of the locking elements (7a, 7b) or behind the locking elements (7a, 7b). [6] Quick-connect device according to any one of the preceding claims, characterized by , that the locking elements (7a, 7b) have ramps (12), wherein the locking elements (7a, 7b) can be moved automatically in the direction of their unlocking position (EP) by the action of the fluid line end piece (3) in the insertion direction (E) on the ramps (12). [7] Quick-connect device according to any one of the preceding claims, characterized by, that the locking elements (7a, 7b) have locking sections (9) for engaging behind the undercut (10) and guide sections (11) for guiding the locking elements (7a, 7b) to one another, wherein the locking sections (9) project beyond the guide sections (11) along the insertion direction (E) and / or wherein a locking section (9) of one of the locking elements (7a, 7b) engages into the other of the locking elements (7a, 7b), preferably wherein the locking elements (7a, 7b) engage reciprocally into one another. [8] Quick-connect device according to any one of the preceding claims, characterized by , that the locking elements (7a, 7b) are designed to generate an acoustic signal, preferably audible, when moving into the locking position (SP) in order to indicate that the fluid line end piece (3) has been secured against removal from the quick-connect device (2). [9] Quick-connect system (1) comprising a quick-connect device (2) according to one of the preceding claims and a fluid line end piece (3) having an undercut (10), in particular formed by a radial circumferential bead or a radial circumferential groove, wherein the locking elements (7a, 7b) of the quick-connect device (2) are each designed to engage behind the undercut (10) in a common locking plane (V) extending transversely to an insertion direction (E) of the fluid line end piece (3), preferably wherein the undercut (10) on the fluid line end piece (3) is formed, in particular completely, circumferentially, as a radially projecting bead and / or as a radial groove. [10] Method for manufacturing a quick-connect device (2) according to any one of claims 1 to 8, wherein the quick-connect device (2) comprises a housing (4) and two locking elements (7a, 7b), wherein the locking elements (7a, 7b) each comprise an actuating element (8) for manually moving the locking elements (7a, 7b), a locking section (9) for securing a fluid line end piece (3) against removal from the quick-connect device (2) by engaging behind an undercut (10) of the fluid line end piece (3), and a guide section (11) for guiding the locking elements (7a, 7b) against each other, wherein the method comprises the following steps: a) Assembling the locking elements (7a, 7b) so that the guide sections (11) of the locking elements (7a, 7b) are adjacent to each other and the locking sections of both locking elements (7a, 7b) run in a common locking plane (V), b) Inserting the compound locking elements (7a, 7b) transversely to the insertion direction (E) into the housing (4), c) Securing the combined locking elements (7a, 7b) against removal from the housing (4) by connecting at least one of the locking elements (7a, 7b) to one of the actuating elements (8).

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