Connection device

Abstract

The invention relates to a connection device (1) for forming a sound-damped, releasable connection between at least two components, wherein the connection device (1) comprises a first engagement element (2), a second engagement element (3) and a fixing element (4), wherein the first engagement element (2) and the second engagement element (3) are designed and configured to form an engagement state with one another, wherein the first engagement element (2) has a first wall (2b) which encloses an entry channel (2c) of the first engagement element (2), wherein the second engagement element (3) has an entry projection (3b) designed to correspond to the entry channel (2c), wherein, in order to form the engagement state, the entry projection (3b) can be introduced into the entry channel (2c), wherein, in the engaged state, the second engagement element (3) is arranged relative to the first engagement element (2) in an end position which can be fixed with the fixing element (4).

Description

[0001] Connection device

[0002] Description

[0003] The invention relates to a connecting device for forming a sound-insulated, detachable connection between at least two components, wherein the connecting device comprises a first engagement element, a second engagement element, and a fixing element, wherein the first engagement element and the second engagement element are configured and arranged to form an engagement state with each other in which the first engagement element engages with the second engagement element and a detachable, positive-locking connection is formed between the first engagement element and the second engagement element, wherein the fixing element is configured to reversibly fix the engagement state, wherein the first engagement element has a first fastening section, through which the first engagement element can be fastened to a first component by means of a first fastening means.wherein the second engagement element has a second fastening section, via which the second engagement element can be fastened to a second component to be connected to the first component by means of a second fastening means.

[0004] The invention further relates to a system comprising a connecting device, at least a first component and at least a second component.

[0005] Technical background

[0006] For the construction of a wide variety of building types, such as schools, hotels, hospitals, etc., modular units (or modular building elements that are assembled to form modular units) are increasingly being used, as this allows for quick and flexible implementation of individual room designs. In terms of sustainability, modular units or modular building elements made of cross-laminated timber (CLT) are gaining particular importance. In this context, the lifting and connection technology of individual modular units at their corners plays a crucial role in their construction, and the requirements for the connection devices used are multifaceted. Among other things, the connection devices should enable easy assembly and disassembly of the modular units, meet regulatory requirements regarding deconstruction, have high load-bearing capacity, and ensure adequate sound insulation.While various types of connecting devices for structural elements are known in the prior art, none of the solutions shown in the prior art can meet the complex requirements profile of connecting devices for structural elements, particularly in the field of modern engineered timber construction.

[0007] Document WO 2009136417 A1 discloses a metal post with a support structure for attaching panel walls, which are used for dividing interior spaces and / or for interior furnishings. The metal post has a pair of parallel, longitudinal, continuous slots designed for attaching panel walls.

[0008] From DE 1810830 A1 a sound-insulating, double-shell partition wall made up of panel elements is known, in which each shell is divided into fields by vertical separation joints, wherein one field of one shell together with one field of the other shell represents a panel element.

[0009] It is therefore an object of the invention to eliminate or at least improve upon the disadvantages of the prior art. In particular, it is an object of the invention to create a reliable and reversible connection device for components.

[0010] This problem is solved by a connecting device having the features of claim 1. Preferred embodiments are described in the dependent claims.

[0011] Brief description of the invention

[0012] According to the invention, the first engagement element has a first wall which encloses an entry channel of the first engagement element, wherein the first wall extends away from the first fastening section, wherein the second engagement element has an entry projection configured corresponding to the entry channel which extends away from the second fastening section, wherein, in order to form the engagement between the first engagement element and the second engagement element, the entry projection can be inserted into the entry channel, wherein, in the engagement state, the second engagement element is arranged relative to the first engagement element in an end position which can be fixed with the fixing element.

[0013] This offers the advantage that, to create a detachable connection, the entry projection of the second engagement element simply needs to be inserted (or threaded) into the entry channel of the first engagement element, and this connection can then be reversibly fixed with the fixing element. Thus, a simple, reliable, and cost-effective connection can be achieved between a first component, to which the first engagement element is attached, and a second component, to which the second engagement element is attached. Furthermore, the connection device according to the invention enables the simplest possible frictionless sliding motion and the tolerance compensation necessary for modular units with typical dimensions of, for example, 3 x 7 m.To enable cost-effective and precise manufacturing, the first and second engagement elements can each be designed as steel components, which can be manufactured, for example, on a lathe. This allows for particularly high manufacturing accuracy (compared to welded components). The connecting device has the further advantage that the engagement state is reversible, thus allowing components to be connected to each other, for example, in a repositioned or permanent manner. The components mentioned in this disclosure can be of a wide variety of types; however, components for modular construction are of particular importance, where, in this context, a modular unit is constructed from walls, ceilings, and floors, which can be connected to form a modular unit using connecting devices according to the invention.It is also possible to connect finished room modules to each other, e.g. to form a room module complex, using connection devices according to the invention.

[0014] It can be advantageous to provide that an outer surface of the second engagement element, which limits the entry projection, is designed in a frustoconical shape. This allows the entry projection to slide into the entry channel particularly easily, which in turn facilitates the formation of the engagement state.

[0015] It can further be provided that the entry projection is designed as a second wall, which encloses an insertion channel for the insertion of the second fastening element, the insertion channel penetrating the entry projection and the second fastening section. The insertion channel can penetrate the second fastening section of the second engagement element, so that the second fastening element, for example a screw, can be guided through the entry projection and through the second fastening section to a component.

[0016] Advantageously, the entry channel extends from the first mounting section of the first engagement element along a principal axis of the first engagement element, with the entry projection extending from the second mounting section of the second engagement element along a principal axis of the second engagement element. Preferably, in the engaged state, the first engagement element and the second engagement element together define a specific longitudinal extent or component height of the connecting device, this longitudinal extent running along the principal axis of the first engagement element. If two components are connected to each other via the connecting device, and the connecting device is arranged between two facing side surfaces of the two components, a minimum distance between the two components preferably corresponds to the longitudinal extent or component height of the connecting device.

[0017] It can be provided that the first wall is designed such that the inlet channel is rotationally symmetrical about the principal axis of the first engagement element. In particular, the first wall can be cylindrical, at least partially or completely. Furthermore, the first wall can be conical (or frustoconical), at least partially or completely.

[0018] It may be provided that the entry projection is designed to be rotationally symmetrical about the main axis of the second engagement element.

[0019] It may be provided that the first engagement element and the second engagement element are designed such that the main axis of the first engagement element and the main axis of the second engagement element are oriented coaxially to each other in the engagement state.

[0020] It may be provided that the entry direction of the second engagement element into the entry channel of the first engagement element, in order to form the engagement state, is along the main axis of the first engagement element or along the main axis of the second engagement element.

[0021] It can be provided that the first fastening section has at least two first centering bores, which are designed to center the first engagement element on a first component, wherein preferably the second fastening section has at least two second centering bores, which are designed to center the second engagement element on a second component.

[0022] It may be provided that at least the first two centering bores are arranged rotationally symmetrically around the main axis of the first engagement element.

[0023] It may be provided that the at least two second centering bores are arranged rotationally symmetrically around the main axis of the second engagement element. It may be provided that an end section of the entry channel distal to the first fastening section has an entry channel opening, wherein the entry channel tapers at least section by section from the entry channel opening towards the first fastening section.

[0024] It may be provided that the first wall of the first engagement element and the entry projection of the second engagement element each have a passage opening which are designed in such a way that, to fix the engagement state, the fixing element is guided through the passage opening of the first wall and through the passage opening of the entry projection in order to block a movement of the second engagement element relative to the second engagement element along the main axis.

[0025] It may be provided that the passage opening of the first wall and the passage opening of the entry projection have an opening diameter, wherein the fixing element is designed as a bolt which has a bolt diameter which is essentially equal to or smaller than the opening diameter.

[0026] The connecting device may include a first damping element designed to dampen contact between the first engagement element and the first fastening element when the first engagement element is attached to a first component. This offers the advantage of reducing or dampening sound transmission between the first fastening element and the first engagement element. Preferably, the first damping element encases at least part of the first fastening element.

[0027] The connecting device may be provided with a second damping element, which is designed to dampen the transmission of sound, in particular structure-borne sound, such as airborne or impact sound, between the first engaging element and the first component when the first engagement element is attached to the first component. By combining a first damping element and a second damping element, the sound transmission between the first engaging element and the second engaging element, and thus also between two components that are detachably connected via the connecting device, can be further reduced.

[0028] It can be provided that the first fastening section has a first contact section facing the first wall, wherein, in the engagement state, the first contact section faces an end section of the entry projection distal to the second fastening section of the second engagement element, the end section being configured such that, in the end position, the end section is spaced apart from the first contact section and preferably from the first damping element. Preferably, the first damping element contacts the first contact section and is not in contact with the end section.In particular, the length (measured from the second mounting section along the second principal axis) of the inlet projection can be shorter than the height (measured from the first mounting section along the first principal axis) of the first wall. This creates a gap (or thus a clearance) between the end section and the first contact section (which, for example, can define the bottom of the inlet channel), corresponding to the difference between the inlet projection length and the wall depth. The first damping element can be positioned in this clearance between the end section and the first contact section, spaced apart from or without contact with the end section. This gap (or clearance) between the end section and the first contact section or the first damping element prevents a sound bridge between the first and second intervention elements.

[0029] It can be provided that the first fastening section has a second contact section facing away from the first wall, wherein in the fastening state the second contact section faces a mounting section of the first component, wherein in the fastening state the second damping element is arranged between the second contact section and the mounting section such that a damping contact is formed between the first engagement element and the first component, wherein preferably the second damping element is designed as a damping layer which contacts the second contact section section by section, preferably over the entire surface.

[0030] It may be provided that the first damping element is arranged within the inlet channel, in particular at an initial section of the inlet channel proximal to the first fastening section.

[0031] It may be provided that the first damping element and / or the second damping element is designed to be rotationally symmetrical about the main axis of the first engagement element.

[0032] It may be provided that the first damping element and / or the second damping element comprise an elastomer. According to a further aspect of the invention, a system comprising a connecting device, a first component, and a second component is provided, wherein the first engagement element of the connecting device is attached to a first component and the second engagement element of the connecting device is attached to a second component, wherein, for the releasable and sound-absorbing connection of the first component to the second component, the first engagement element and the second engagement element are in the engaged state, which is reversibly fixed by the fixing element.

[0033] It may be provided that the first building element and / or the second building element comprises a wall element of a room cell.

[0034] According to a further aspect of the invention, a connection device system can be provided which comprises at least two connection devices according to the invention, wherein the at least two connection devices are connected to each other by a coupling element, wherein first components can be connected to a first connection device and second components can be connected to a second connection device, wherein connected first components and connected second components can be connected to each other via the coupling element.

[0035] It can be provided that in the engagement state of the first connecting device the first components and in the engagement state of the second connecting device the second components are each fixed relative to each other along a first direction which is oriented parallel to the respective main axis, wherein the coupling element is designed such that the first components and the second components are each fixed relative to each other along a second direction orthogonal to the first direction.

[0036] A third damping element may be provided, which is designed to form a damping contact between the coupling element and first components and / or second components.

[0037] It can be provided that the second damping element and the third damping element are formed in one piece, with the third damping element preferably being designed as an elastomer bearing.

[0038] It can be provided that the coupling element mechanically connects a first fastening section and / or a second fastening section of the first connecting device with a first fastening section and / or a second fastening section of the second connecting device, wherein the coupling element is preferably designed as a tab element.

[0039] Brief description of the characters

[0040] The invention is explained in more detail below with reference to an advantageous embodiment, to which, however, the invention is not limited.

[0041] The illustrations show:

[0042] Fig. 1 shows a sectional view of a connecting device according to the invention in the fixed engagement state;

[0043] Fig. 2 shows a sectional view of a first engagement element;

[0044] Fig. 3 shows a sectional view of a second engagement element;

[0045] Fig. 4 shows a perspective view of the first engagement element according to Fig. 2;

[0046] Fig. 5 shows a perspective view of the second engagement element according to Fig. 3;

[0047] Fig. 6 shows a connection device system according to the invention;

[0048] Fig. 7 shows a top view of a coupling element.

[0049] Character description

[0050] Fig. 1 shows an embodiment of a connection device 1 according to the invention, which enables a sound-insulated, detachable connection between at least two components (not shown).

[0051] The connecting device 1 comprises a first engagement element 2 (shown in detail and individually in Figs. 2 and 4), a second engagement element 3 (shown in detail and individually in Figs. 3 and 5), and a fixing element 4. The first engagement element 2 and the second engagement element 3 are designed and configured to form an engagement state with each other, as illustrated in Fig. 1. In the engagement state, the first engagement element 2 engages with the second engagement element 3. This creates a releasable, positive-locking connection between the first engagement element 2 and the second engagement element 3. The fixing element 4 is configured to reversibly fix the engagement state.

[0052] As shown in Fig. 2 and Fig. 4, the first engagement element 2 has a first fastening section 2a, above which the first engagement element 2 can be fastened to a first component by means of a first fastening means 5a (the first fastening means is shown in Fig. 1).

[0053] To accommodate the second engagement element 3, thereby realizing the engagement state, the first engagement element 2 has a first wall 2b which encloses an inlet channel 2c of the first engagement element 2. The first wall 2b extends away from the first mounting section 2a. In the illustrated embodiment, the inlet channel 2c extends away from the first mounting section 2a of the first engagement element 2 along a principal axis x1 of the first engagement element 2. Furthermore, the first wall 2b is designed such that the inlet channel 2c (or the first wall 2b) is rotationally symmetrical about the principal axis x1 of the first engagement element 2. In the illustrated embodiment, the first wall 2b is cylindrical, with the inlet channel 2c defining the interior of the cylinder formed by the first wall 2b.

[0054] A distal end section of the entry channel 2c, relative to the first attachment section 2a, has an entry channel opening 2g. The second engagement element 3 can be inserted into the entry channel 2c through this entry channel opening 2g. To ensure particularly smooth and low-friction insertion, the entry channel 2c tapers section by section from the entry channel opening 2g towards the first attachment section 2a, at least section by section. In the illustrated embodiment, the taper is formed approximately in the first quarter of the entry channel 2c, starting from the entry channel opening 2g, or from the first wall 2b.

[0055] As can be seen in Fig. 3 and Fig. 5, the second engagement element 3 has a second fastening section 3a, via which the second engagement element 3 can be fastened to a second component to be connected to the first component by means of a second fastening means 5b (the second fastening means 5b is shown in Fig. 1).

[0056] The second engagement element 3 further has an inlet projection 3b that corresponds to the inlet channel 2c of the first engagement element 2 (and is shorter compared to the inlet channel depth). This projection extends away from the second mounting section 3a. In this case, the inlet projection 3b extends from the second mounting section 3a of the second engagement element 3 along a principal axis x2 of the second engagement element 3. The inlet projection 3b is rotationally symmetrical about the principal axis x2 of the second engagement element 3.

[0057] To achieve a positive-locking connection between the first engagement element 2 and the second engagement element 3, an outer surface 3d of the second engagement element 3, which defines the entry projection 3b, is designed in a frustoconical shape in the illustrated embodiment. This allows a positive-locking connection (or a positive-locking contact) to be achieved between an inner surface of the first wall 2b and the outer surface 3d of the entry projection 3b.

[0058] In the illustrated embodiment, the entry projection 3b is designed as a second wall. This wall encloses an insertion channel 3e for inserting the second fastening element 5b (see Fig. 1). The insertion channel 3e extends through the entry projection 3b and also through the second fastening section 3a. Alternatively, the fastening section 3a can also be designed as a solid body, in which case the second fastening element 5b can extend through a portion of the fastening section 3a that is not opposite the entry projection 3b.

[0059] On a side of the fastening section 3a facing away from the entry projection 3b, the second engagement element 3 has a contact surface 3f (see Fig. 5). When the second engagement element 3 is fastened to a second component, this contact surface 3f contacts a mounting surface of the second component. To fasten the second engagement element 3 to the second component, the second fastening element 5b is guided through the insertion channel 3e to the second component and fixed in it. The second fastening element 5b (and also the first fastening element 5a) is, for example, a screw (or something equivalent).

[0060] To establish the engagement between the first engagement element 2 and the second engagement element 3, the entry projection 3b is inserted into the entry channel 2c. In this embodiment, the entry direction of the entry projection 3b into the entry channel 2c of the first engagement element 2 is along the principal axis x1 of the first engagement element 2 (which can also be referred to as the first principal axis x1) or along the principal axis x2 of the second engagement element 3 (which can also be referred to as the second principal axis x2). The first engagement element 2 and the second engagement element 3 are designed such that the principal axis x1 of the first engagement element 2 and the principal axis x2 of the second engagement element 3 are oriented coaxially to each other in the engagement state. In the engagement state, the second engagement element 3 is arranged in an end position relative to the first engagement element 2 (see Fig. 1).In this final position, the outer surface 3d of the second engagement element 3, which defines the inlet projection 3b, contacts an inner surface of the first wall 2b of the first engagement element 2 (facing the inlet projection 3b). In the illustrated embodiment, for example, a conical initial section of the inlet projection 3b (the initial section which adjoins or originates from the second fastening section 3a) contacts the also conically tapered section of the first wall 2b (the section which extends from the inlet channel opening 2g towards the first fastening section 2a).

[0061] As illustrated in Figures 2 to 5, the first fastening section 2a has at least two first centering bores 7a. These are designed to center the first engagement element 2 on a first component. The second fastening section 3a also has at least two second centering bores 7b, which are designed to center the second engagement element 3 on a second component. In this embodiment, the at least two first centering bores 7a are arranged rotationally symmetrically about the first principal axis x1. Furthermore, the at least two second centering bores 7b are arranged rotationally symmetrically about the second principal axis x2.

[0062] The end position shown in Fig. 1 is reversibly fixed by the fixing element 4. For this purpose, the first wall 2b of the first engagement element 2 and the entry projection 3b of the second engagement element 3 each have two passage openings 8a, 8b (see Fig. 4 and Fig. 5). The passage openings 8a, 8b are designed such that, to fix the engagement state, the fixing element 4 is guided through the passage openings 8a of the first wall 2b and through the passage openings 8b of the entry projection 3b. This blocks any movement of the second engagement element 3 relative to the second engagement element 2 in the opposite direction of entry. In the illustrated embodiment, the insertion direction of the fixing element 4 into the passage openings 8a, 8b is orthogonal to the first principal axis x1 or to the second principal axis x2 or to the entry direction of the entry projection 3b into the entry channel 2c.

[0063] The through-openings 8a of the first wall 2b and the through-openings 8b of the entry projection 3b have a specific opening diameter, preferably all being the same. In the illustrated embodiment, the fixing element 4 is designed as a locking bolt with a bolt diameter of [missing value]. This bolt diameter is preferably substantially equal to or (slightly) smaller than the opening diameter of the through-openings 8a, 8b. This allows for a certain degree of "play" in fixing the engagement state. The locking bolt shown in Fig. 1 has a through-opening at its left end section (in the plane of the image) through which a locking element of the locking bolt can be inserted to prevent the locking bolt from being pulled out of the through-openings 8a, 8b.

[0064] In the illustrated embodiment, the connecting device 1 comprises a first damping element 6a. This is designed to dampen contact (or transmission of sound, in particular structure-borne sound, for example airborne sound or impact sound) between the first engagement element 2 and the first fastening element 5a in the fastening state in which the first engagement element 2 is attached to a first component.

[0065] In the illustrated embodiment, the connecting device 1 additionally comprises a second damping element 6b. This damping element is designed to dampen the transmission of sound, in particular structure-borne sound, such as airborne or impact sound, between the first engagement element 2 and the first component when the first engagement element 2 is attached to a first component. In principle, the sound to be dampened can originate from the first component and / or the second component, with the first damping element 6a and / or the second damping element 6b reducing sound transmission between the first and second components. A third damping element (which can be configured to correspond to the contact surface 3f) can also be arranged between the contact surface 3f of the second engagement element 3 and the mounting surface of the second component.

[0066] The damping effect will be explained in more detail below. As shown in Figures 1 and 2, the first fastening section 2a has a first contact section 2d facing the first wall 2b. In the engaged state, the first contact section 2d faces an end section 3c of the entry projection 3b (distal to the second fastening section 3a of the second engagement element 3) and is spaced apart from it, i.e., not in contact with it. The first damping element 6a is arranged within the entry channel 2c, in particular at an initial section 2f of the entry channel 2c (or the first wall 2b) that is proximal to the first fastening section 2a. In the end position, the first damping element 6a is thus arranged in the space between the first contact section 2d and the end section 3c, whereby the first damping element 6a contacts the first contact section 2d and is not in contact with the end section 3c.In the illustrated embodiment, the first damping element 6a is designed as a damping ring which partially encloses the first fastening element 5a, thus damping contact between the first fastening element 5a and the first contact section 2d. An (optional) washer 9 is also arranged between the first fastening element 5a and the first damping element 6a.

[0067] The first fastening section 2a has a second contact section 2e facing away from the first wall 2b. In the fastening state, the second contact section 2e faces a mounting section of the first component. To ensure damping (or sound-absorbing) contact between the first engagement element 2 and the first component, the second damping element 6b is arranged between the second contact section 2e and the mounting section in the fastening state, such that the second damping element 6a contacts the contact section 2e and the mounting section sectionwise, preferably over its entire surface. Preferably, the second damping element 6b is designed as a damping layer.

[0068] The first damping element 6a and / or the second damping element 6b can be designed to be rotationally symmetrical about the principal axis x1 of the first engagement element 2. In particular, in this embodiment, the first damping element 6a and the second damping element 6b are penetrated by the first fastening element 5a.

[0069] Preferably the first damping element 6a and / or the second damping element 6b comprises an elastomer.

[0070] Fig. 6 shows a connection device system with a first connection device 1 and a second connection device 1', which are mechanically connected to each other via a coupling element 9.

[0071] First components B1 are connected to a first connecting device 1, and second components B2 are connected to a second connecting device 1', with the first components B1 and the second components B2 being connected to each other via the coupling element 9. In Fig. 6, the first components B1 and the second components B2 are each schematically composed of two L-shaped components, which are connected to each other at their corners. The connecting devices 1, 1' are each attached to the respective components of components B1 and B2 by means of corresponding fasteners 5a, 5a', 5b, 5b'.

[0072] By coupling the connecting devices 1, T and the coupling element 9, a horizontal and a vertical coupling of the components B1, B2 can be achieved. In particular, shear forces acting orthogonally to the main axis x1 or xT can be transmitted between adjacent components B1, B2 via the coupling element 9. This allows a reliable – and especially a detachable and sound-absorbing – connection to be achieved in all three spatial axes.

[0073] Fig. 7 shows a top view of the coupling element 9, which in the illustrated embodiment is designed as a rectangular, plate-shaped tab element. The tab element mechanically connects the first engagement element 2 of the first connecting device 1 to the first engagement element 2' of the second connecting device 1'. For this purpose, the coupling element 9 comprises two openings in which the respective fastening section 2a, 2a' is received. Alternatively or additionally, the coupling element 9 can also mechanically connect the second engagement elements 3, 3' of the respective connecting devices 1, 1'.

[0074] In the engaged state of the first connecting device 1, the first components B1 and, in the engaged state of the second connecting device 1', the second components B2 are each fixed relative to each other along a first direction oriented parallel to the respective principal axis x1, xT. In addition to this fixation, the first components B1 and the second components B2 are each fixed relative to each other by the coupling element 9 along a second direction orthogonal to the first direction – or in a plane oriented orthogonal to the principal axis x1.

[0075] To create a sound-absorbing connection, an optional third damping element 9a is provided, which is arranged between the coupling element 9 and first components B1 and second components B2, wherein in the illustrated embodiment the third damping element is designed as an elastomer bearing which has a thickness of, for example, 6 mm.

[0076] Between superimposed components of the first building elements B1 and / or second building elements B2, at least one or more shear lugs, preferably with a 45° toothing, can be arranged which transmit a horizontal shear between superimposed components.

Claims

Patent claims 1. Connecting device (1) for forming a sound-insulated, detachable connection between at least two components, wherein the connecting device (1) comprises a first engagement element (2), a second engagement element (3) and a fixing element (4), wherein the first engagement element (2) and the second engagement element (3) are designed and configured to form an engagement state with each other in which the first engagement element (2) engages with the second engagement element (3) and a detachable positive-locking connection is formed between the first engagement element (2) and the second engagement element (3), wherein the fixing element (4) is configured to reversibly fix the engagement state. wherein the first engagement element (2) has a first fastening section (2a) via which the first engagement element (2) can be fastened to a first component by means of a first fastening means (5a), wherein the second engagement element (3) has a second fastening section (3a) via which the second engagement element (3) can be fastened to a second component to be connected to the first component by means of a second fastening means (5b), characterized by the fact that the first engagement element (2) has a first wall (2b) which encloses an entry channel (2c) of the first engagement element (2), wherein the first wall (2b) extends away from the first fastening section (2a), wherein the second engagement element (3) has an entry projection (3b) configured corresponding to the entry channel (2c) which extends away from the second fastening section (3a), wherein, in order to form the engagement between the first engagement element (2) and the second engagement element (3), the entry projection (3b) can be inserted into the entry channel (2c), wherein, in the engagement state, the second engagement element (3) is arranged relative to the first engagement element (2) in an end position which can be fixed with the fixing element (4).

2. Connecting device (1) according to claim 1, wherein an outer surface (3d) of the second engagement element (3) limiting the entry projection (3b) is designed in a frustoconical shape.

3. Connecting device (1) according to one of the preceding claims, wherein the entry projection (3b) is designed as a second wall which encloses an insertion channel (3e) for inserting the second fastening means (5b), wherein the insertion channel (3e) penetrates the entry projection (3b) and the second fastening section (3a).

4. Connecting device (1) according to one of the preceding claims, wherein the inlet channel (2c) extends away from the first fastening section (2a) of the first engagement element (2) along a principal axis (x1) of the first engagement element (2), wherein the inlet projection (3b) extends away from the second fastening section (3a) of the second engagement element (3) along a principal axis (x2) of the second engagement element (3).

5. Connecting device (1) according to claim 4, wherein the first wall (2b) is designed such that the inlet channel (2c) is rotationally symmetrical about the main axis (x1) of the first engagement element (2).

6. Connecting device (1) according to claim 4 or 5, wherein the entry projection (3b) is designed to be rotationally symmetrical about the main axis (x2) of the second engagement element (3).

7. Connecting device (1) according to one of claims 4 to 6, wherein the first engagement element (2) and the second engagement element (3) are designed such that the main axis (x1) of the first engagement element (2) and the main axis (x2) of the second engagement element (3) are oriented coaxially to each other in the engagement state.

8. Connecting device (1) according to one of claims 4 to 7, wherein an entry direction of the second engagement element (3) into the entry channel (2c) of the first engagement element (2), to form the engagement state, is along the first principal axis (x1) of the first engagement element (2).

9. Connecting device (1) according to one of the preceding claims, wherein the first fastening section (2a) has at least two first centering bores (7a) which are designed for centering the first engagement element (2) on a first component, wherein preferably the second fastening section (3a) has at least two second centering bores (7b) which are designed for centering the second engagement element (3) on a second component.

10. Connecting device (1) according to claim 9, wherein the at least two first centering bores (7a) are arranged rotationally symmetrically about the main axis (x1) of the first engagement element (2).

11. Connecting device (1) according to claim 9 or 10, wherein the at least two second centering bores (7b) are arranged rotationally symmetrically about the main axis (x2) of the second engagement element (3).

12. Connecting device (1) according to one of the preceding claims, wherein a distal end section of the inlet channel (2c) to the first fastening section (2a) has an inlet channel opening (2g), wherein the inlet channel (2c) tapers at least section by section from the inlet channel opening (2g) to the first fastening section (2a).

13. Connecting device (1) according to one of the preceding claims, wherein the first wall (2b) of the first engagement element (2) and the entry projection (3b) of the second engagement element (3) each have a passage opening (8a, 8b) which are designed such that, to fix the engagement state, the fixing element (4) is guided through the passage opening (8a) of the first wall (2b) and through the passage opening (8b) of the entry projection (3b) in order to block a movement of the second engagement element (3) relative to the first engagement element (2) along the main axis (x1).

14. Connecting device (1) according to claim 13, wherein the passage opening (8a) of the first wall (2b) and the passage opening (8b) of the entry projection (3b) have an opening diameter, wherein the fixing element (4) is designed as a bolt which has a bolt diameter which is substantially equal to or smaller than the opening diameter.

15. Connecting device according to one of the preceding claims, wherein the connecting device (1) has a first damping element (6a) which is configured to dampen contact between the first engagement element (2) and the first fastening element (5a) in a fastening state in which the first engagement element (2) is attached to a first component.

16. Connecting device (1) according to one of the preceding claims, wherein the connecting device (1) has a second damping element (6b) which is configured to dampen the transmission of sound, in particular structure-borne sound, for example airborne sound or impact sound, between the first engagement element (2) and the first component in a fastening state in which the first engagement element (2) is attached to a first component. 17.Connecting device (1) according to one of claims 15 or 16, wherein the first fastening section (2a) has a first contact section (2d) facing the first wall (2b), wherein in the engagement state the first contact section (2d) faces an end section (3c) of the entry projection (3b) distal to the second fastening section (3a) of the second engagement element (3), wherein the end section (3c) is configured such that in the end position the end section (3c) is spaced apart from the first contact section (2d), and preferably from the first damping element (6a).

18. Connection device (1) according to one of claims 15 to 17, wherein the first fastening section (2a) has a second contact section (2e) facing away from the first wall (2b), wherein in the fastening state the second contact section (2e) faces a mounting section of the first component, wherein in the fastening state the second damping element (6b) is arranged between the second contact section (2e) and the mounting section such that a damping contact is formed between the first engagement element (2) and the first component, wherein preferably the second damping element (6b) is designed as a damping layer which contacts the second contact section (2e) section by section, preferably over its entire surface.

19. Connecting device (1) according to one of claims 15 to 18, wherein the first damping element (6a) is arranged within the inlet channel (2c), in particular at an initial section (2f) of the inlet channel (2c) proximal to the first fastening section (2a).

20. Connecting device (1) according to one of claims 15 to 19, wherein the first damping element (6a) and / or the second damping element (6b) is designed rotationally symmetric about the main axis (x1) of the first engagement element (2).

21. Connecting device (1) according to one of claims 15 to 20, wherein the first damping element (6a) and / or the second damping element (6b) comprise an elastomer.

22. System comprising a connecting device (1) according to one of claims 1 to 21, a first component and a second component, wherein the first engagement element (2) of the connecting device (1) is attached to a first component and the second engagement element (3) of the connecting device (1) is attached to a second component, wherein, for the purpose of releasably and sound-absorbingly connecting the first component to the second component, the first engagement element (2) and the second engagement element (3) are in the engagement state, which is reversibly fixed with the fixing element (4).

23. System according to claim 22, wherein the first component and / or the second component comprises a wall element of a room cell.

24. Connection device system comprising at least two connection devices (1, T) according to any one of claims 1 to 21, wherein the at least two connection devices (1, T) are connected to each other by a coupling element (9), wherein first components (B1) can be connected to a first connection device (1) and second components (B2) can be connected to a second connection device (1'), wherein connected first components (B1) and connected second components (B2) can be connected to each other via the coupling element (9).

25. Connection device system according to claim 24, wherein in the engagement state of the first connection device (1) the first components (B1) and in the engagement state of the second connection device (1') the second components (B2) are each fixed relative to each other along a first direction which is oriented parallel to the respective principal axis (x1, x1'), wherein the coupling element (9) is designed such that the first components (B1) and the second components (B2) are each fixed relative to each other along a second direction orthogonal to the first direction.

26. Connection device system according to claim 24 or 25, comprising a third damping element (9a) which is configured to form a damping contact between the coupling element (9) and first components (B1) and / or second components (B2).

27. Connection device system according to claim 26, wherein the second damping element (6b) and the third damping element (9a) are formed in one piece, wherein preferably the third damping element (9a) is designed as an elastomer bearing.

28. Connection device system according to one of claims 24 to 27, wherein the coupling element (9) mechanically connects a first fastening section (2a) and / or a second fastening section (3a) of the first connection device (1) to a first fastening section (2a') and / or a second fastening section (3a') of the second connection device (1'), wherein the coupling element (9) is preferably designed as a tab element.

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