Connection system

Abstract

Connection system (10) with at least one connector (1) having a connecting bolt (2) and a receiving cylinder (3) rotatable relative to the connecting bolt (2), wherein the connecting bolt (2) has a connector neck (22) and a connector head (21) adjoining the connector neck (22) and being thicker than the connector neck (22); wherein the receiving cylinder (3) has a receiving opening (33) which opens into a head guide (38) formed between a cylinder base (31) and a cylinder cover (32) of the receiving cylinder (3) and ending at a head stop, characterized in that the receiving opening (33) is designed as a through-hole in the cylinder base (31) and opens into a guide arc formed in the cylinder base (31) which forms a connector neck guide (34),the radially outwardly bounded by a section of the cylinder base (31) designed as a ring segment and radially inwardly bounded by at least one convex guide surface formed in the cylinder base (31), wherein a width (b) of the connector neck guide (34) is less than a cross-section of the connector head (21), and wherein at least one inner surface of the cylinder cover (32) and / or the cylinder base (31) oriented towards the head guide (38) has a slope extending in the direction of the head stop and parallel to the circumferential direction (U) of the receiving cylinder (3).

Description

[0001] The present invention relates to a connection system comprising at least one connector having a connecting bolt and a receiving cylinder rotatable relative to the connecting bolt, wherein the connecting bolt has a connector neck and a connector head adjoining the connector neck and being thicker than the connector neck; wherein the receiving cylinder has a receiving opening which opens into a head guide formed between a cylinder base and a cylinder cover of the receiving cylinder and ending at a head stop.

[0002] Connection systems of this type are known as connectors for furniture components. In one known connection system, for example, a receiving cylinder is inserted into a recess formed in an upright furniture component such that its receiving opening is oriented towards a plate to be placed on the upper edge of the upright furniture component. A connecting bolt is then guided through the plate placed on the upright furniture component and through a longitudinal bore formed in the upright furniture component, extending from its upper edge to the recess, into the receiving cylinder. The connector head of the connecting bolt is thereby positioned in the receiving opening of the receiving cylinder.

[0003] In the known connection system, the receiving opening leads into a head guide formed in the connector receiving cylinder, which terminates at a head stop. The head guide is bounded inwards by a guide cylinder and outwards by opposing guide rings formed on the cylinder base and cylinder head. The receiving cylinder is then rotated relative to the connecting bolt, whereby the connector head slides in the head guide until it reaches the head stop, and the receiving opening is moved away from the longitudinal bore.

[0004] During this rotational movement, the connecting bolt lies radially within the receiving cylinder, with a head cap of the connector head positioned opposite the outer wall of a guide cylinder that runs axially centrally through the receiving cylinder. Furthermore, during this rotational movement, the connector neck, which has a smaller diameter than the connector head, is guided in a neck guide slot formed in the cylinder wall of the receiving cylinder, between the cylinder base and the cylinder cover of the receiving cylinder. The width of this neck guide slot is smaller than the diameter of the connector head.

[0005] Because the connector head, when it rests against the head stop, cannot slip outwards through the neck guide slot, it is securely held in this final position and the two furniture parts are securely connected. To release this connection, the receiving cylinder is turned back to its original position.

[0006] German patent application DE 77 27 932 U1 describes a connecting fitting with a circular cylindrical rotating body and a screw bolt for the detachable fastening of two adjacent furniture panels. Inside the rotating body is an eccentric chamber with a spirally shaped boundary wall. The eccentric chamber is radially accessible from the outside for the screw bolt via a circumferential groove, with the shank of the screw bolt projecting radially outwards. By rotating the rotating body about its cylindrical axis, the screw head of the screw bolt penetrates deep into the eccentric chamber, bearing against the boundary wall and then being clamped within the chamber.

[0007] Patent application DE 85 19 780 U1 discloses a furniture connector fitting with a cylindrical part that is divided into two discs by a slot perpendicular to its axis of rotation. The slot is formed into eccentrically extending tracks in the discs. When the fitting rotates, these tracks engage the head of a screw bolt and, due to their eccentricity, attract it, thereby clamping the furniture parts against each other.

[0008] German patent application DE 20 2010 013 164 U1 discloses an eccentric connecting fitting with two eccentric surfaces axially separated by a slot for engaging the bolt head of a clamping bolt. The eccentric surfaces have at least two differently shaped cross-sections, allowing the use of different clamping bolts.

[0009] German patent application DE 18 48 353 U describes a swivel fitting with a rotating part and a dowel for connecting two furniture parts, preferably abutting at right angles. The rotating part has a centrally extending slot that exposes two opposing and parallel eccentric contact surfaces, each approaching a central transverse axis of the rotating part from the outside inwards. The dowel has hook-shaped ends on both sides, the inner contact surfaces of which correspond to the shape of the two eccentric contact surfaces. To achieve a large surface area of ​​friction, all contact surfaces are curved. When the rotating part is turned, the contact surfaces are drawn into it under low specific surface pressure.

[0010] Publication GB 2 443 424 A discloses a furniture connector with a cam element in the form of a cylindrical drum and a dowel with a head. A slot is formed around the circumference of the drum in which the dowel can be received such that the dowel head is located inside the drum. The slot has a ramp profile on its inner side, formed by cam surfaces on both sides of the slot, which are designed to engage the head of the dowel. In use, rotation of the cam drum causes the dowel to be drawn towards the axis of rotation of the drum by the action of the cam surfaces on the head of the dowel.

[0011] Document WO 2003 / 093 688 A1 relates to a fastening device with a drum and an elongated, headed tie rod for securing two plates together. The drum also has a cylindrical circumferential surface and an inner surface shaped as an eccentric or cam relative to an axis of rotation of the drum. A notch is provided on the wall section between the circumferential surface and the inner surface. During use, a shaft section of the tie rod passes through this notch, so that its head rests on the eccentric inner wall and interacts with it to clamp the plates. At one end, the notch opens into a generously sized slot that allows the head of the tie rod to be inserted into the notch. At the other end, the notch is bounded by a stop surface. One or more constrictions are provided on the two longitudinal edges of the notch.To pass through the constriction, an operator must slightly increase the torque applied to the drum, which is audible as a soft click. After passing through the first constriction, the plates are not yet jammed together, but are connected.

[0012] Publication CN 1 09 973 477 A describes a locking mechanism with a thermoformed body for furniture panels. The lower end of the thermoformed body is a closed, tightening end, and the upper end is open. An insertion opening is formed in one side wall of the thermoformed body. A locking groove is formed on one side of the insertion opening. A side wall of the thermoformed body is provided with an arcuate locking wall that slopes downwards towards the interior of the thermoformed body. The upper end of the locking wall is lower than the upper end of the thermoformed body when in a horizontal position. The upper end of the arcuate locking wall is connected to an inner wall of the thermoformed body by a first plastic reinforcement piece, and a second plastic reinforcement piece is attached to an outer wall of the arcuate locking wall.

[0013] The known connection system can only be used to connect furniture parts that are aligned at a right angle to each other.

[0014] It is therefore the object of the present invention to provide a connection system with which two components can be connected with little installation space, low effort and yet high contact force, wherein the connection made with the connection system should be easily and non-destructively detachable.

[0015] The task is accomplished by a connection system comprising at least one connector having a connecting bolt and a receiving cylinder rotatable relative to the connecting bolt, wherein the connecting bolt has a connector neck and a connector head adjoining the connector neck and thicker than the connector neck;wherein the receiving cylinder has a receiving opening which opens into a head guide formed between a cylinder base and a cylinder cover of the receiving cylinder and ending at a head stop, wherein the receiving opening is formed as a through-hole in the cylinder base and opens into a guide arc formed in the cylinder base, forming a connector neck guide, which is bounded radially outwards by a section of the cylinder base formed as an annular segment and radially inwards by at least one convex guide surface formed in the cylinder base, wherein a width of the connector neck guide is less than a cross-section of the connector head, and wherein at least one inner surface of the cylinder cover and / or the cylinder base oriented towards the head guide has a slope extending in the direction of the head stop and parallel to the circumferential direction of the receiving cylinder.

[0016] The connector(s) of the connection system according to the invention is / are each formed in two parts, i.e., consisting of the receiving cylinder and the connecting bolt, which are interdependent. The receiving cylinder serves to partially receive the connecting bolt.

[0017] In the present invention, the term "receiving cylinder" refers to a cylindrical or conical part. The axially opposing sections of the receiving cylinder are hereinafter referred to as the cylinder base and cylinder cover. The cylinder base comprises an underside of the receiving cylinder facing the connecting bolt during assembly. The cylinder cover comprises an underside of the receiving cylinder facing away from the connecting bolt during assembly, in or on which an actuating means for rotating the receiving cylinder is typically provided. The cylinder base and the cylinder cover are permanently connected to each other or formed integrally.

[0018] The connecting bolt has an elongated connector body with a neck on which the connector head sits. The connector head has a larger cross-section than the connector neck; that is, it is thicker radially than the connector neck. The connector body and the connector neck can have the same cross-section, or the connector neck can have a smaller cross-section than the connector body. If the connecting bolt is a screw, the screw thread is formed on the connector body, while typically, but not necessarily, the connector neck is not threaded. Hereinafter, the term "head cover" refers to the surface of the free end of the connector head projecting into the receiving cylinder.Furthermore, the term "chin" of the connecting bolt is used below to refer to the transition from the connector head to the connector neck, where there is a reduction in cross-section towards the neck, typically forming an edge at the chin. The connecting bolt can rest on a guide or sliding surface at the chin.

[0019] Unlike the connection system described above, which is known from the prior art, in the connection system according to the invention the connecting bolt is not inserted perpendicular to a longitudinal axis of the receiving cylinder, but parallel to the longitudinal axis of the receiving cylinder. For this purpose, in the connection system according to the invention the receiving opening is not formed in a cylinder wall of the receiving cylinder, as in the prior art, but in the cylinder base. In the present invention, the cylinder base is not necessarily located at the bottom. Rather, the cylinder base is a component of the receiving cylinder that axially limits the receiving cylinder on one side and faces the connecting bolt.

[0020] In the present invention, the connection between the receiving cylinder and the connecting bolt is established by rotating the receiving cylinder relative to the connecting bolt. In contrast to the prior art, the direction of rotation in which the receiving cylinder is rotated relative to the connecting bolt is not transverse to a longitudinal axis of the connecting bolt, but parallel to the circumferential direction of the connecting bolt.

[0021] The connection system according to the invention thus enables the formation of a form-fit and force-fit connection between two components aligned parallel to each other, such as a connection of a lid on a support structure aligned parallel to the lid or a connection between two superimposed plates.

[0022] To create such a connection, in the connection system according to the invention, the receiving cylinder is inserted into a recess formed in a first component to be joined, in which it is rotatable. The receiving cylinder is rotated into a starting position in which the receiving opening formed in the receiving cylinder is opposite a connecting bolt of a connecting pin that is fixedly inserted into a second component to be joined and projects from it in the direction of the receiving cylinder. To connect the two components, the first component with the receiving cylinder is placed onto the connecting bolt and thus onto the second component, or vice versa. This causes the connecting bolt's connecting bolt to project into the receiving opening and be received therein. The axis of rotation of the receiving cylinder is aligned parallel to the longitudinal axis of the connecting bolt.

[0023] The receiving cylinder is then rotated circumferentially relative to the connecting bolt. This causes the connector head to move within the receiving cylinder, in a head guide formed between the cylinder base and the cylinder head, until it reaches the head stop. The top of the connector head faces or rests against a first sliding surface of the head guide. This first sliding surface is formed by a section of the inner surface of the cylinder head. The chin of the connector head faces or rests against a second sliding surface of the head guide. This second sliding surface is formed by an inner surface of a segment of the cylinder base shaped like an annular segment.

[0024] In the area of ​​the head guide, the cylinder shell of the receiving cylinder is preferably open, forming a groove extending in the circumferential direction of the receiving cylinder.

[0025] Furthermore, during this rotational movement, the connector neck of the connecting bolt, which adjoins the connector head and has a smaller cross-section than the connector head, is guided through the section of the cylinder base designed as a ring segment. A radially inner concave side surface of the ring segment faces the circumference of the connector neck or rests against it.

[0026] The connector neck guide is thus bounded radially outwards by an inner surface of the guide arc, which forms a concave guide surface. Radially inwards, the connector neck guide is bounded by at least one convex guide surface formed in the cylinder base.

[0027] Because the width of the connector neck guide is less than the cross-section of the connector head, the connector head cannot slip out of the head guide when the connector neck is in the connector neck guide, thus holding the connecting bolt in the receiving cylinder.

[0028] In the present invention, at least one inner surface of the cylinder cover and / or cylinder base, aligned with the head guide, has a slope extending towards the head stop and parallel to the circumferential direction of the receiving cylinder. This creates a helical head guide within the receiving cylinder, at the end of which a detent position for the connector head is formed. This helical head guide generates an axial force during the rotation of the receiving cylinder relative to the connecting bolt, for example, counterclockwise. Accordingly, in the application of the connection system according to the invention—in contrast to connectors known from the prior art, in which a force is generated in the radial direction to the cylindrical body—a tensile load is exerted on the connector in the axial direction of the receiving cylinder.

[0029] The connection system according to the invention thus enables the creation of a force-fit and form-fit connection that is non-destructive and can be quickly released due to the small angle of rotation. The operating principle of the connection system according to the invention allows for the generation of high tensile forces. Very little installation space is required to create the connection. The connection can be released without special tools or separating processes. No parts need to be removed when disassembling the respective connector.

[0030] This makes it possible, for example, to easily replace and / or repair battery cells located in battery housing covers when using the connection system according to the invention. However, the connection system according to the invention can also be used in other areas of application, such as the assembly of furniture, containers, or boxes. The use of the connection system according to the invention proves particularly advantageous where flat components, such as covers, are to be attached to a base body and firmly connected to it. This can be the case, for example, with maintenance covers to be mounted on machines or systems.

[0031] The connection system according to the invention also has the advantage that its connectors are reusable, which can be used to reduce costs.

[0032] Furthermore, with the connection system according to the invention, it is possible to monitor its assembly, for example by measuring and / or controlling torque.

[0033] The slope of the inner surface of the cylinder cover and / or the cylinder base can also be designed so that the head guide narrows towards the head stop, thus enabling the connector head to wedge itself in the detent position.

[0034] Preferably, the inner surface of the cylinder cover and / or the cylinder base is flat at a detent position formed at the head stop and has no slope there. This allows the connector head to rest securely.

[0035] In an advantageous embodiment of the connection system according to the invention, the connector head is cylindrical or cylindrical-conical in shape. This shape of the connector head allows it to rest securely on at least one of the sliding tracks in a detent position against the head stop.

[0036] It has proven advantageous in one embodiment of the invention if the width of the connector neck guide tapers from the receiving opening to the head stop. This allows the connector head to wedge itself into the detent position at the head stop, ensuring it is held securely in place.

[0037] It has proven practical to have at least one actuating means formed on or in the cylinder cover, by which the receiving cylinder can be rotated relative to the connecting bolt on the cylinder cover. The actuating means can be a recess or raised area formed on the upper surface of the cylinder cover, allowing it to be engaged, preferably with a tool.

[0038] For example, the cylinder cover can be disc-shaped, and the actuating element can be a contour formed in the cylinder cover. This contour can be slotted, cross-shaped, hexagonal, or Torx-shaped.

[0039] In a preferred embodiment of the connection system according to the invention, the cylinder base has a radially inwardly projecting guide lug which, on the one hand, forms at least one convex guide surface that radially inwardly limits the connector neck guide, and on the other hand, also has a concave outer surface that partially limits the receiving opening. This special design of the cylinder base allows it to be used both for receiving the cylinder head and for guiding the connector neck.

[0040] Preferably, the connecting bolt is a screw. In other embodiments of the present invention, the connecting bolt can also be a pin or bolt, which may, for example, be glued in or connected to a base body by force or form locking, such as being pressed into the base body.

[0041] If the screw used as a connecting bolt is a flat head screw, it can be held particularly securely in the detent position, whereby vibrations can be avoided by its contact with the respective sliding surface.

[0042] In a preferred embodiment of the invention, at least one receiving cylinder for at least one of the connectors is incorporated into a cover, and at least one connecting bolt is attached to at least one position on a base body to be covered by the cover, opposite the respective receiving cylinder, and its connector head is aligned in the direction of the respective receiving cylinder. In this way, the cover can be easily and securely connected to the base body, and the connection can be easily and non-destructively released at any time.

[0043] It is advantageous if each screw is screwed into an internal thread formed in the base body.

[0044] Further advantageous embodiments of the connection system according to the invention can be additionally designed with spring elements, such as coil and / or disc springs, to secure the connection, especially for applications with high requirements for dynamic load capacity.

[0045] Preferred embodiments of the present invention are explained in more detail below with reference to figures, wherein Fig. Figure 1 schematically shows a receiving cylinder of an embodiment of a connection system according to the invention in a perspective view looking at a cylinder base of the receiving cylinder; Fig. 2 schematically the receiving cylinder Fig. 1 shows a perspective view looking at a cylinder cover of the receiving cylinder; Fig. Figure 3 schematically shows a connector of the connection system according to the invention in a side view, wherein the connector forms the receiving cylinder from the Fig. 1 and Fig. 2 with a connecting bolt included therein, which is only partially shown; Fig. Figure 4 schematically shows an embodiment of a connection system according to the invention in a perspective view; and Fig. 5 schematically an enlarged section from the in Fig. Figure 4 shows the connection system in a perspective view from a different angle.

[0046] The Fig. 1 and Fig. Figures 2 each schematically show a receiving cylinder 3 of an embodiment of an invention, for example in the Fig. 4 and Fig. Figure 5 shows the connection system 10 in various perspective views. The receiving cylinder 3 has a cylinder base 31 and a cylinder cover 32 connected to it. In the embodiment shown, the cylinder base 31 and the cylinder cover 32 are formed in one piece, i.e., from the same piece of material.

[0047] The cylinder base 31 has a through-opening which forms a receiving opening 33 for receiving a connector head 21 of, for example, a Fig. The connecting bolt 2, shown in part 3, forms the connection. The receiving opening 33 has an inner diameter D that is larger than the outer diameter d of the connector head 21.

[0048] The receiving opening 33 leads into a guide arch, which is also designed as a through-opening in the cylinder base 31. The guide arch forms a connector neck guide 34, along which a connector neck 22 adjoining the connector head 21 of the connecting bolt 2 is guided.

[0049] Furthermore, a radially inwardly projecting guide lug 35 is formed from the material of the cylinder base 31. The guide lug 35 has, on the one hand, a concave outer surface 351 formed by a first side wall section, which partially delimits the receiving opening 33. On the other hand, the guide lug 35 forms a convex guide surface 352 by means of a further side wall section, which radially delimits the connector neck guide 34.

[0050] The connector neck guide 34 is radially bounded outwards by an inner wall 361 of a ring segment 36 formed by the material of the cylinder base 31.

[0051] In the embodiment shown, the connector neck guide 34 has a width b which gradually decreases from the receiving opening 33 to one end of the connector neck guide 34.

[0052] Between the ring segment 36 and the cylinder cover 32, the receiving cylinder 3 has a sleeve slot 37 in its cylinder shell. A head guide 38 extends within the receiving cylinder 3 at the level of this sleeve slot 37, along which the connector head 21 of the connecting bolt 2 is guided. The head guide 38 begins at the receiving opening 33 and ends at a head stop.

[0053] The head guide 38 is, as described in the Fig. 1 and Fig. As can be seen in Figure 2, the receiving cylinder 3 is bounded in the axial direction A by an inner surface 362 of the ring segment 36 and by an inner surface 322 of the cylinder cover 32. The inner surface 362 forms a sliding surface for a head cover of the connector head 21, while the inner surface 322 forms a sliding surface for a chin of the connector head 21.

[0054] In the embodiment shown, the inner surface 322 has a slope that increases in the circumferential direction U of the receiving cylinder 3 towards the head stop.

[0055] In other embodiments of the present invention, the inner surface 362 can also have a slope increasing in the circumferential direction U of the receiving cylinder 3 towards the head stop, whereby the head guide 38 tapers towards the head stop.

[0056] In the illustrated embodiment, an actuating element 323 in the form of a slot is provided in the upper surface 321 of the cover. In other embodiments of the invention, a recess or a projection can also be provided as the actuating element.

[0057] To establish a connection, the connecting bolt 2 with its connector head 21 is inserted into the receiving opening 33 of the receiving cylinder 3. The receiving cylinder 3 is then rotated relative to the connecting bolt 2 in the circumferential direction U of the receiving cylinder 3 by means of the actuating means 323. During this rotation, the connector head 21 moves in the head guide 38, while the connector neck 22 is guided in the connector neck guide 34, until the connector head 21 abuts the head stop. This position constitutes an end and / or detent position for the connecting bolt 2.

[0058] In the Fig. 1, Fig. 2 to Fig. In the embodiment shown in Figure 3, the cylinder base 31 of the receiving cylinder 3 has a smaller material thickness than the cylinder cover 32. In embodiments of the invention not shown, the cylinder base 31 can also be the same thickness as, or thicker than, the cylinder cover 32. The corresponding addition of material to the cylinder base 31 in the axial direction increases the size of the connector 1 and its installation height, but also the tensile force that can be applied. Preferably, the material is added over the entire cylindrical surface of the cylinder base 31 so that more material is available below the helical head guide. This allows high forces to be applied to the cylinder cover 32 and reduces the risk of breakage at the radii of the head guide.

[0059] The Fig. 4 and Fig.Figure 5 schematically shows how a connection is made between a cover 11 and a base body 12, onto which the cover 11 is placed, by means of several connectors 1. The connectors 1 create a detachable joint between the cover 11 and the base body. The receiving cylinders 3 of the connectors 1 are housed in the cover 11 in a space-saving manner.

[0060] In the illustrated embodiment, the connecting bolts 2 of the connectors 1 are designed as screws that are screwed into the base body 12. The connecting bolts 2 thus serve as fixed points for the connection system 10.

[0061] For example, the cover 11 can be a housing cover for a traction battery and the base body 12 can be a battery housing. Sufficient pressure can be applied by the connectors 1 to achieve sufficiently low electrical contact resistances between the contact and the battery cell, thus enabling a virtually lossless current flow.

Claims

[1] Connection system (10) comprising at least one connector (1) having a connecting bolt (2) and a receiving cylinder (3) rotatable relative to the connecting bolt (2), wherein the connecting bolt (2) has a connector neck (22) and a connector head (21) adjoining the connector neck (22) and being thicker than the connector neck (22); wherein the receiving cylinder (3) has a receiving opening (33) which opens into a head guide (38) formed between a cylinder base (31) and a cylinder cover (32) of the receiving cylinder (3) and ending at a head stop, characterized by, that the receiving opening (33) is designed as a through-hole in the cylinder base (31) and opens into a guide arc formed in the cylinder base (31) which forms a connector neck guide (34), which is bounded radially outwards by a section of the cylinder base (31) designed as a ring segment and radially inwards by at least one convex guide surface formed in the cylinder base (31), wherein a width (b) of the connector neck guide (34) is less than a cross-section of the connector head (21), and wherein at least one inner surface of the cylinder cover (32) and / or the cylinder base (31) oriented towards the head guide (38) has a slope extending in the direction of the head stop and parallel to the circumferential direction (U) of the receiving cylinder (3). [2] Connection system (10) according to claim 1, characterized by, that the inner surface of the cylinder cover (32) and / or the cylinder base (31) is flat at a detent position formed on the head stop and has no slope there. [3] Connection system (10) according to claim 1 or 2, characterized by , that the connector head (21) is cylindrical or cylindrical-conical in shape. [4] Connection system (10) according to any of the preceding claims, characterized by , that a width (b) of the connector neck guide (34) tapers from the receiving opening (33) to the head stop. [5] Connection system (10) according to any of the preceding claims, characterized by , that at least one actuating means (323) is formed on or in the cylinder cover (32) by which the receiving cylinder (3) can be rotated on the cylinder cover (32) relative to the connecting bolt (2). [6] Connection system (10) according to claim 5, characterized by, that the cylinder cover (32) is disc-shaped and the actuating means (323) is a slot formed in the cylinder cover (32). [7] Connection system (10) according to any of the preceding claims, characterized by , that the cylinder base (31) has a radially inwardly projecting guide nose (35) which on the one hand forms the at least one convex guide surface (352) by which the connector neck guide (34) is radially inwardly limited and on the other hand also has a concave outer surface (351) which forms a partial limit of the receiving opening (33). [8] Connection system (10) according to any of the preceding claims, characterized by , that the connecting bolt (2) is a screw. [9] Connection system (10) according to claim 8, characterized by that the screw is a flat head screw. [10] Connection system (10) according to any of the preceding claims, characterized by, that at least one receiving cylinder (3) is inserted into at least one of the connectors (1) in a cover (11) and at least one connecting bolt (2) is attached to at least one position opposite the respective receiving cylinder (3) of a base body (12) to be covered by the cover (11) and is aligned with its connector head (21) in the direction of the respective receiving cylinder (3). [11] Connection system (10) according to claim 10, in that the respective screw is screwed into an internal thread formed in the base body (12).

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