Connecting unit and connecting device

Abstract

Connecting unit (1) for establishing a non-destructively detachable connection between at least two objects, characterized by at least one connecting section (2) which is U-shaped in cross section and has two connecting legs (3, 4) running parallel to one another and a web (5) connecting the connecting legs (3, 4) to one another at the edges, and by at least one fastening section (6) which is connected to the web (5) and via which the connecting unit (1) can be fastened to one of the objects, wherein hook projections (7) which are wedge-shaped in cross section and run in the longitudinal direction of the connecting unit (1) and each taper away from the fastening section (6) are arranged on opposite sides of the respective connecting leg (3, 4).

Description

The invention relates to a connecting unit and a connecting device for producing a non-destructively releasable connection between at least two objects.It is known from DE 84 09 701 U1, for example, to connect two objects in the form of pads to one another in a non-destructively detachable manner via hook and loop connections. DE 202 18 818 U1 also discloses a non-destructively detachable connection of objects in the form of pads.It is an object of the invention to provide a simple and more quickly manageable possibility for non-destructively detachable connection of at least two objects.This object is achieved by claim 1. Advantageous embodiments are reproduced in the dependent patent claims, the following description and the figures, wherein these embodiments, taken individually or in combination of at least two of these embodiments with one another, can represent an advantageous and / or further developing aspect of the invention.A connection unit according to the invention for producing a non-destructively releasable connection between at least two objects has at least one connection section which is of U-shaped cross section and has two connection limbs running parallel to one another and a web connecting the connection limbs to one another on the edge side, and at least one fastening section which is connected to the web and by means of which the connection unit can be fastened to one of the objects, wherein hook projections which are of wedge-shaped cross section and run in the longitudinal direction of the connection unit and in each case taper away from the fastening section are arranged on mutually opposite sides of the respective connection limb.According to the invention, a non-destructively releasable connection between at least two objects can be produced by fastening a connection unit according to the invention to each object and subsequently inserting, for example inserting, the connection units into one another, so that the two connection units are connected to one another in a non-destructively releasable manner. Due to the configuration according to the invention of the connecting units or the hook projections thereof, the hook projections of one connecting unit engage behind the hook projections of the other connecting unit.The non-destructively releasable connection between the at least two objects via two connection units according to the invention can be subjected to tension without the connection thereby being released, which is ensured by the mutual engagement behind the hook projections. The connection between the two connecting units can be referred to as a latching connection, for example.If the connection between the two connecting units according to the invention or the objects connected thereto is to be released in a non-destructive manner, the connecting units can be moved or displaced relative to one another parallel to their longitudinal extents until the one connecting unit no longer engages in the other connecting unit. The connecting units can then be connected again to one another if necessary by the connecting units being moved relative to one another transversely to their longitudinal extents and as a result being inserted again into one another. This relative movement between the connecting units can be a movement transversely to the longitudinal extents of the connecting units or parallel to these longitudinal extents. Both the production of the non-destructively releasable connection between at least two objects and the release of this connection can therefore take place in a simple manner and also quickly according to the invention.Between the two parallel connecting legs of the connecting section of U-shaped cross section, a receiving space is formed which is closed on one side by the web connecting the connecting legs to one another on the edge side and is open on a side opposite the web. In order to produce a non-destructively releasable connection between objects, a connecting leg of a further connecting unit according to the invention can be inserted, for example inserted or inserted, into this receiving space of a connecting unit according to the invention, namely in such a way that hook projections on the connecting leg of the one connecting unit inserted into the receiving space engage behind the hook projections of the two connecting legs of the other connecting unit projecting into the receiving space.The fastening section of the connection unit according to the invention serves for fastening the connection unit to one of the objects to be joined together in a non-destructively releasable manner. The fastening section can be configured, for example, in the form of a strip. The fastening section can extend, for example, over the entire length of the connecting section, wherein the length of the connecting section is parallel to the longitudinal extension of the connecting unit. The fastening portion can be fastened to an object by sewing, clamping or the like, for example.On each connecting leg of the connecting unit according to the invention, hook projections of wedge-shaped cross-section are arranged on opposite sides, run in the longitudinal direction of the connecting unit and taper away from the fastening section. At least one hook protrusion can extend, for example, over the entire length of the connecting unit or only over a part of this length. At least one hook projection can have a cross-sectional area in the form of an obtuse-angled triangle, so that the hook projection forms an undercut on its side facing the web. As a result, an even more robust or loadable non-destructively releasable connection between at least two objects can be produced, in particular if all the hook projections of the connection unit are correspondingly formed.The connection unit according to the invention can be designed, for example, as an elongated profile or in the form of a strand. The connection unit according to the invention can be, for example, an injection-molded component or an extruded component.According to an advantageous embodiment, at least one guide projection running in the longitudinal direction of the connecting unit is arranged on mutually facing sides of the connecting legs in a region arranged between the hook projections and the web, wherein the guide projections are arranged at a distance relative to one another. The guide projections can be used to guide a free end section of a connecting leg of a further connecting unit inserted into the receiving space between the two connecting legs of the connecting unit, both when the connecting leg is inserted into the receiving space and when a disturbance-free releasable connection is produced between the two connecting units. At least one guide projection can extend, for example, over the entire length of the connecting unit or merely over a part of this length.According to a further advantageous embodiment, at least one guide projection is wedge-shaped in cross section, wherein this guide projection narrows away from the fastening section. As a result, the guide projection has an inclined guide surface which rises in the direction of the web or fastening portion. As a result, the insertion of a connecting leg of one connecting unit simplifies the receiving space of the other connecting unit by preventing the connecting leg to be inserted from being blocked or stopped by the guide projection.According to a further advantageous embodiment, the hook projections are arranged on a free end section of the respective connecting leg, the length of which is shorter than half a length of the respective connecting leg, wherein the hook projections are arranged at a distance from the free end of the free end section of the respective connecting leg. If two correspondingly designed connecting units are inserted into each other for establishing a non-destructively releasable connection between the connecting units, a play remains as a result of which the inserted connecting units remain movable relative to each other by a certain extent transversely to their longitudinal extents. In this way, manufacturing tolerances or the like can be compensated for, for example.According to a further advantageous embodiment, the fastening section is connected in cross section to a central region of an outer side of the web, wherein a groove-shaped depression extending over a length of the web is arranged between a respective longitudinal edge of the outer side of the web and the fastening section. The groove-shaped depression on the outer side of the web can be used, for example, for producing a non-destructively releasable connection between correspondingly configured connection units, for example, by a closing unit, for example a closing unit described below, engaging into the groove-shaped depression in order to exert a closing force on the connection unit.According to a further advantageous embodiment, the connecting unit is at least partially made of a plastic. As a result, the connecting unit can be partially or completely flexible or elastic. This makes it possible for the connecting unit to be able to adapt to a shape of an object and, for example, also to a change in the shape of the object.According to a further advantageous embodiment, the connecting unit is configured monolithically. As a result, the connecting unit can be produced in a simple manner and without the need for assembly steps, for example using an injection molding method or an extrusion method. As a result, the connecting unit can be produced more cost-effectively.A connecting device according to the invention for producing a non-destructively releasable connection between at least two objects has at least two connecting units according to one of the aforementioned configurations or a combination of at least two of these configurations with one another, wherein one of the connecting units can be fastened to the one object and the other of the connecting units can be fastened to the other object.The connection device correspondingly has the advantages mentioned above with respect to the connection unit.According to an advantageous embodiment, the connecting device has at least one strip-shaped connecting strip which has connecting sections arranged on mutually opposite sides of a longitudinal central axis of the connecting strip, wherein hook projections of wedge-shaped design in cross section and extending in the longitudinal direction of the connecting strip and tapering towards the respectively closest longitudinal edge of the connecting strip are arranged on mutually opposite sides of the respective connecting section of the connecting strip. The connecting units can be connected to one another in a non-destructively releasable manner via the connecting strip, which represents an alternative to a direct connection of the connecting units to one another. To produce the non-destructively releasable connection, the connecting strip can be inserted into the receiving space of at least one connecting unit or inserted into the receiving space parallel to a longitudinal extent of the connecting unit. The connecting strip can be connected first to one connecting unit and then to the other connecting unit. Alternatively, the connecting strip can be connected simultaneously to the two connecting units. In order to release the non-destructively releasable connection, the connecting strip can be pulled out of the connecting units, for example, along the longitudinal extents of the connecting units. According to this alternative as well, the non-destructively releasable connection between the connection units can thus be produced and released again in a simple manner and rapidly. At least one hook projection can extend, for example, over the entire length of the connecting strip or only over a part of this length. At least one hook projection can have a cross-sectional area in the form of an obtuse-angled triangle, so that the hook projection forms an undercut on its side facing away from the nearest free end or edge of the connecting strip. As a result, an even more robust or loadable non-destructively releasable connection between at least two objects can be produced, in particular if all the hook projections of the connection units are correspondingly formed.According to a further advantageous embodiment, at least one guide projection running in the longitudinal direction of the connecting strip is arranged on mutually remote sides of the respective connecting section of the connecting strip in a region arranged between the hook projections and the longitudinal central axis of the connecting strip, wherein the guide projections are arranged at a distance relative to one another. The respective guide protrusion of the connecting strip serves to guide the connecting strip when it is inserted into a receiving space of a further connecting unit. At the same time, the guide projections of the connecting strip can serve to keep the free end portions of the connecting legs of a connecting unit, into the receiving space of which the connecting strip is partially inserted, at a certain distance from one another.According to a further advantageous embodiment, at least one guide projection of the connecting strip is wedge-shaped in cross section, wherein this guide projection narrows towards the respectively closest longitudinal edge of the connecting strip. As a result, when the connecting strip is inserted into the receiving space of a connecting unit, the free end portions of the connecting legs of the connecting unit can be guided with the guide projections of the connecting strip, which simplifies the insertion of the connecting strip into the receiving space of the connecting unit.According to a further advantageous embodiment, the connecting strip is at least partially made of a plastic. As a result, the connecting strip can be partially or completely flexible or elastic. This makes it possible for the connecting strip to be able to adapt to a shape of an object and, for example, also to a change in the shape of the object.According to a further advantageous embodiment, the connecting strip is formed monolithically. As a result, the connecting strip can be produced in a simple manner and without the need for assembly steps. As a result, the connecting strip can be produced more cost-effectively.According to a further advantageous embodiment, the connecting device has at least one closing unit for connecting the connecting units to one another or for connecting the two connecting units to the connecting strip, wherein the closing unit has a trapezoidal closing receptacle which runs from an enlarged input-side end of the closing unit continuously to a tapered output-side end of the closing unit and is laterally bounded by a closing projection of the closing unit in each case. The closing unit can be used, for example, to connect two connecting units directly to one another or indirectly to one another via a connecting strip. In this case, the closing unit can be pushed onto the connecting units along the longitudinal extent of the connecting units and the connecting units can thereby be moved towards one another according to the zipper principle, whereby the hook projections of the connecting units or of the connecting units and of the connecting strip engage behind one another in a progressive manner. In this case, a distance between the closing projections of the closing unit at the flared input-side end of the closing unit can be greater by a certain extent than a distance between the outer sides of the limbs of the interconnected connecting units.According to a further advantageous embodiment, an undercut extending over the entire length of the respective closing projection is formed on a side of the respective closing projection facing the respective other closing projection. As a result, when the closing unit is pushed onto the connecting units in the longitudinal direction of the connecting units, it can be avoided that the closing unit disengages from the connecting units.The invention is explained below by way of example with reference to the appended figures on the basis of preferred embodiments, wherein the features mentioned below can represent an advantageous and / or further developing aspect of the invention both individually and in different combinations with one another. It shows: FIG. 1 shows a schematic front view of an exemplary embodiment of a connection unit according to the invention; FIG. 2 shows a schematic and perspective illustration of a length section of the connection unit shown in FIG. 1 ; FIG. 3A is a schematic front view of an embodiment of a connecting device according to the invention in a first load state; FIG. 3B is a schematic end view of the connecting device shown in FIG. 3A in a second load state; FIG. 4A is a schematic front view of a further exemplary embodiment of a connecting device according to the invention in a first load state; FIG. 4B is a schematic end view of the connecting device shown in FIG. 4A in a second load state; FIG. 5 shows a schematic and perspective illustration of a portion of the connecting strip shown in FIGS. 4A and 4B ; FIG. 6 shows a schematic and perspective illustration of an exemplary embodiment of a closing unit for a closing device according to the invention; and FIG. 7 is a schematic front view of the closing unit shown in FIG. 6. In the figures, identical or functionally identical components are provided with the same reference numerals. Repeated description of such components may be omitted.FIG. 1 shows a schematic front view of an exemplary embodiment of a connection unit 1 according to the invention for producing a non-destructively releasable connection between at least two objects not shown. The connecting unit 1 is made entirely of a plastic and is formed monolithically.The connecting unit 1 has a connecting section 2 which is U-shaped in cross section and has two connecting legs 3 and 4 running parallel to one another and a web 5 connecting the connecting legs 3 and 4 to one another on the edge side.In addition, the connecting unit 1 has a fastening section 6 which is connected to the web 5 and is designed in the form of a strip, by means of which the connecting unit 1 can be fastened to one of the objects.On mutually opposite sides of the respective connecting limb 3 or 4, hook projections 7 of wedge-shaped configuration in cross section, running in the longitudinal direction of the connecting unit 1 perpendicular to the plane of the drawing and tapering away from the fastening section 6 in each case, are arranged. The hook projections 7 are arranged on a free end section of the respective connecting limb 3 or 4, the length of which is shorter than one half of a length L of the respective connecting limb 3 or 4 lying in the plane of the drawing of FIG. 1. The hook projections 7 are arranged at a distance A from the free end 8 of the free end section of the respective connecting limb 3 or 4. Each hook projection 7 has a cross-sectional area in the form of an obtuse-angled triangle, so that the hook projection 7 forms an undercut on a side facing the web 5.On mutually facing sides of the connecting legs 3 and 4, at least one guide projection 9 running in the longitudinal direction of the connecting unit 1 perpendicular to the plane of the drawing of FIG. 1 is arranged in each case in a region arranged between the hook projections 7 and the web 5. The two guide projections 9 are arranged at a distance relative to one another. Each guide projection 9 is wedge-shaped in cross section, wherein the respective guide projection 9 tapers away from the fastening section 6.The fastening section 6 is connected in cross section to a central region of an outer side 10 of the web 5. Between a respective longitudinal edge of the outer side 10 of the web 5 perpendicular to the plane of the drawing of FIG. 1 and the fastening section 6, a groove-shaped depression 11 is arranged which extends over a length of the web 5 perpendicular to the plane of the drawing of FIG. 1 and forms an undercut.FIG. 2 shows a schematic and perspective illustration of a length section of the connection unit 1 shown in FIG. 1, as a result of which the structure of the connection unit 1 is once again clear.FIG. 3A shows a schematic front view of an exemplary embodiment of a connecting device 12 according to the invention for producing a non-destructively releasable connection between at least two objects, not shown, in a first load state.The connecting device 12 has two connecting units 1, each of which is designed in accordance with the exemplary embodiment shown in FIGS. 1 and 2. One of the two connecting units 1 can be fastened to the one object and the other of the two connecting units 1 can be fastened to the other object.In FIG. 3A, the two connecting units 1 are inserted into one another in such a way that they are connected to one another in a non-destructively releasable manner. To produce this connection, the connection units can have been moved towards one another transversely to their longitudinal directions perpendicular to the plane of the drawing of FIG. 3A until the state shown in FIG. 3A is reached. Alternatively, the connecting units 1 can have been pushed into one another parallel to their longitudinal extents.In the first load state of the connecting device 12 shown in FIG. 3A, the connecting device 12 is loaded under pressure, wherein the free end 8 of one of the connecting legs 3 of the respective connecting unit 1 is supported on the web 5 of the respective other connecting unit 1. In this first load state of the connecting device 12, the hook projections 7 of one connecting unit 1 are arranged at a distance from the hook projections 7 of the other connecting unit 1.FIG. 3B shows a schematic front view of the connecting device 12 shown in FIG. 3A in a second load state. In the second load state of the connecting device 12 shown in FIG. 3B, the connecting device 12 is under tension. The hook projections 7 of one connecting unit 1 contact or engage behind the hook projections 7 of the other connecting unit 1.FIG. 4A shows a schematic front view of a further exemplary embodiment of a connecting device 12 according to the invention for producing a non-destructively releasable connection between at least two objects, not shown, in a first load state.The connecting device 12 differs from the exemplary embodiment shown in FIGS. 3A and 3B in that the connecting device 12 additionally has a strip-shaped connecting strip 13. The connecting strip 13 is made entirely of a plastic and is formed monolithically.The connecting strip 13 is respectively inserted half way into the connecting units 1, so that the connecting units 1 are indirectly connected to one another in a non-destructive manner via the connecting strip 13. To produce this connection, the connecting strip 13 can have been moved transversely to its longitudinal direction perpendicular to the plane of the drawing of FIG. 4A, one after the other or simultaneously, toward the connecting units 1 until the state shown in FIG. 4A is reached. Alternatively, the connecting strip 13 can have been pushed into the connecting units 1 parallel to its longitudinal extension.The connecting strip 13 has connecting sections 14 arranged on mutually opposite sides of a longitudinal central axis of the connecting strip 13 which is perpendicular to the plane of the drawing of FIG. 4A. On mutually opposite sides of the respective connecting section 14 of the connecting strip 13, hook projections 7 of wedge-shaped configuration in cross section, extending in the longitudinal direction of the connecting strip 13 and tapering towards the respective closest longitudinal edge 15 of the connecting strip 13 are arranged. The hook projections 7 are formed corresponding to the hook projections 7 of the connection units 1.On mutually remote sides of the respective connecting section 14 of the connecting strip 13, at least one guide projection 15 running in the longitudinal direction of the connecting strip 13 is arranged in each case in a region arranged between the hook projections 7 and the longitudinal central axis of the connecting strip 13, wherein the guide projections 15 are arranged at a distance relative to one another. Each guide projection 16 of the connecting strip 13 is wedge-shaped in cross section, wherein the respective guide projection 16 tapers towards the respective closest longitudinal edge 15 of the connecting strip 13.In the first load state of the connecting device 12 shown in FIG. 4A, the connecting device 12 is loaded under pressure, wherein the longitudinal edges 16 of the connecting strip 13 are supported on the webs 5 of the connecting units 1. In this first load state of the connecting device 12, the hook projections 7 of the connecting strip 13 are arranged at a distance from the hook projections 7 of the connecting units 1.FIG. 4B shows a schematic front view of the connecting device 12 shown in FIG. 4A in a second load state. In the figure shown in FIG. In the second load state of the connecting device 12 shown in BB, the connecting device 12 is under tension. The hook projections 7 of the connecting strip 13 contact or engage behind the hook projections 7 of the connecting units 1.FIG. 5 shows a schematic and perspective illustration of a section of the connecting strip 13 shown in FIGS. 4A and 4B, whereby the structure of the connecting strip 13 is once again clear.FIG. 6 shows a schematic and perspective illustration of an exemplary embodiment of a closing unit 17 for a closing device according to the invention, which is not shown in more detail. The closing device can otherwise be configured, for example, according to the exemplary embodiment shown in FIGS. 3A and 3B or the exemplary embodiment shown in FIGS. 4A to 5. Accordingly, the locking unit 17 can be used for connecting the connection units shown in Figs. 1 to 4B to each other or for connecting the connection units to the connection strip shown in Figs. 4B to 5.The closing unit 17 has a trapezoidal closing receptacle 18 which extends from an enlarged input-side end 19 of the closing unit 17 continuously to a tapered output-side end 20 of the closing unit 17 and is laterally bounded in each case by a closing projection 21 of the closing unit 17. The closing projections 21 are arranged laterally on a base plate 22 of the closing unit 17. Two openings 23 and 24 of different sizes are arranged on the base plate 22. The opening 24 can be manually engaged, for example, in order to be able to actuate the closing unit 17 for carrying out a closing operation in which the connecting units are connected to one another or to the connecting strip.On a side of the respective closing projection 21 facing the respective other closing projection 21, an undercut 25 is formed extending over the entire length of the respective closing projection 21. As a result, the respective closing projection 21 can engage in a groove shown in FIGS. 1 to 4B on the outer side of the respective connecting unit.FIG. 7 shows a schematic front view of the closing unit 17 shown in FIG. 6, whereby the structure of the closing unit 17 is again clear.List of reference characters1 Connecting unit 2 Connecting portion of 1 3 Connecting leg 4 Connecting leg 5 Web 6 Fastening portion 7 Hook protrusion 8 Free end of 3, 4 9 Guide protrusion on 3, 4 10 Outer side of 5 11 Depression on 10 12 Connecting device 13 Connecting strip 14 Connecting portion of 13 15 Longitudinal edge of 13 16 Guide protrusion on 13 17 Closing unit 18 Closing receptacle 19 Widened end of 17 20 Tapered end of 17 21 Closing protrusion 22 Base plate 23 Opening on 22 24 Opening on 22 25 Undercut on 21 A Distance between 7 and 8 L Length of 3, 4References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 84 09 701 U1

[0002] DE 202 18 818 U1

[0002]

Claims

Connecting unit (1) for producing a non-destructively releasable connection between at least two objects, characterized byat least one connecting portion (2) which is of U-shaped cross section and has two connecting limbs (3, 4) running parallel to one another and a web (5) connecting the connecting limbs (3, 4) to one another on the edge side, and at least one fastening portion (6) which is connected to the web (5) and via which the connecting unit (1) can be fastened to one of the objects, wherein hook projections (7) which are of wedge-shaped cross section and run in the longitudinal direction of the connecting unit (1) and taper away from the fastening portion (6) in each case are arranged on mutually opposite sides of the respective connecting limb (3, 4).Connecting unit (1) according to Claim 1, characterized in that at least one guide projection (9) running in the longitudinal direction of the connecting unit (1) is arranged in each case on mutually facing sides of the connecting limbs (3, 4) in a region arranged between the hook projections (7) and the web (5), wherein the guide projections (9) are arranged at a distance (A) relative to one another.Connecting unit (1) according to claim 2, characterised in that at least one guide projection (9) is wedge-shaped in cross-section and tapers away from the fastening portion (6).Connecting unit (1) according to one of Claims 1 to 3, characterized in that the hook projections (7) are arranged on a free end section of the respective connecting limb (3, 4) whose length is shorter than one half of a length (L) of the respective connecting limb (3, 4), wherein the hook projections (7) are arranged at a distance (A) from the free end (8) of the free end section of the respective connecting limb (3, 4).Connecting unit (1) according to one of Claims 1 to 4, characterized in that the fastening section (6) is connected in cross section to a central region of an outer side (10) of the web (5), wherein a depression (11) which is of groove-shaped design and extends over a length of the web (5) is arranged between a respective longitudinal edge of the outer side (10) of the web (5) and the fastening section (6).Connecting unit (1) according to one of Claims 1 to 5, characterized in that the connecting unit (1) is produced at least partially from a plastic.Connecting unit (1) according to one of Claims 1 to 6, characterized in that the connecting unit (1) is of monolithic design.Connecting device (12) for producing a non-destructively releasable connection between at least two objects, characterized byat least two connecting units (1) according to one of Claims 1 to 7, wherein one of the connecting units (1) can be fastened to the one object and the other of the connecting units (1) can be fastened to the other object.Connecting device (12) according to Claim 8, characterized byat least one strip-shaped connecting strip (13) which has connecting sections (14) arranged on mutually opposite sides of a longitudinal central axis of the connecting strip (13), wherein hook projections (7) which are wedge-shaped in cross section and extend in the longitudinal direction of the connecting strip (13) and taper towards the respectively closest longitudinal edge (15) of the connecting strip (13) are arranged on mutually opposite sides of the respective connecting section (14) of the connecting strip (13).Connecting device (12) according to Claim 9, characterized in that at least one guide projection (16) running in the longitudinal direction of the connecting strip (13) is arranged in each case on mutually remote sides of the respective connecting section (14) of the connecting strip (13) in a region arranged between the hook projections (7) and the longitudinal central axis of the connecting strip (13), wherein the guide projections (16) are arranged at a distance relative to one another.Connecting device (12) according to claim 10, characterised in that at least one guide projection (16) of the connecting strip (13) is wedge-shaped in cross-section and tapers towards the respectively closest longitudinal edge (15) of the connecting strip (13).Connecting device (12) according to one of Claims 9 to 11, characterized in that the connecting strip (13) is produced at least partially from a plastic.Connecting device (12) according to one of Claims 9 to 12, characterized in that the connecting strip (13) is of monolithic design.Connecting device (12) according to one of Claims 8 to 13, characterized byat least one closing unit (17) for connecting the connecting units (1) to one another or for connecting the two connecting units (1) to the connecting strip (13), wherein the closing unit (17) has a trapezoidal closing receptacle (18) which runs from an input-side end (19) of the closing unit (17), which is of widened configuration, continuously to an output-side end (20) of the closing unit (17), which output-side end is of tapered configuration, and is bounded laterally by a respective closing projection (21) of the closing unit (17).Connecting device (12) according to claim 14, characterised in that an undercut (25) extending over the entire length of the respective closing projection (21) is formed on a side of the respective closing projection (21) facing the respective other closing projection (21).

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