Connection system for joining at least two, especially plate-like, elements; arrangement with such a connection system

Description

[0001] The invention relates to a connection system for connecting at least two, in particular plate-like, components with the features of the preamble of claim 1 and an arrangement with features of the independent claim.

[0002] Various connection and fastening systems are known. It may be desirable to design a screw connection comprising a screw and a corresponding nut in such a way that it connects two elements together and requires access only from one side. This is particularly desirable when it is difficult to apply tools to the nut due to insufficient space. Such connection systems are used, for example, in the assembly of metal profiles or in the construction of crane scaffolding.

[0003] For example, DE 10 2017 116 858 A1 describes a fastening element for fastening to a mounting rail with a hammer head screw which is housed in a U-shaped clip so that the hammer head screw can be pivoted about an axis.

[0004] DE 10 2017 116 856 A1 proposes a rectangular tubular mounting rail with a hammerhead bolt as the fastening element. The mounting rails are formed with recesses extending in the longitudinal direction into which a disc-shaped abutment of the fastening element can be countersunk. The abutment is arranged on a shank of a screw of the fastening element.

[0005] US 2 681 679 A, ​​US 3 785 421 A, DE 69 48 314 U, FR 2 241 213 A5 and US 2018 / 266 476 A1 each show a connection system with features of claim 1.

[0006] The object of the invention is to provide a connection system for connecting two, in particular, plate-like elements or components, which can be conveniently fastened from one side.

[0007] This problem is solved by a connection system having the features of claim 1. The connection system comprises a screw and a nut corresponding to the screw. The nut has a screw channel extending along a screw axis. The screw can be screwed into this screw channel. The screw channel preferably has an internal thread, at least in sections. This allows, for example, a conventional screw to be screwed in.

[0008] The connection system also includes a cage for holding the nut. This cage serves to hold the nut in place while screwing in the screw, particularly without the need to hold the nut with a wrench.

[0009] The nut has a special shape, with a base section and a head section extending along the screw axis. The base section protrudes beyond the head section, at least in sections, in a direction perpendicular to the screw axis. In other words, the base section has a larger cross-sectional area than the head section when viewed along the screw axis. The nut can therefore be designed as a hammerhead nut, with the base section projecting beyond the head section in a hammer-like manner.

[0010] This design allows the head portion of the nut to pass through the elements or components to be fastened together, while the base portion rests against one of the elements or components. By screwing in the screw, the elements / components to be fastened are pressed together, with lateral forces being absorbed by the head portion of the nut. Since the nut is held in the cage when the screw is screwed in, it can be easily handled from one side, particularly without counter-fixing the nut with a wrench.

[0011] Preferably, the base portion and the head portion of the nut merge into one another in a stepped manner. In particular, the base portion and the head portion together form a step. In this respect, an inner edge can extend between the base portion and the head portion, in which a circumferential surface of the head portion abuts a surface of the base portion substantially at a right angle.

[0012] Preferably, the screw channel runs through the head section and the foot section. The screw channel can be designed, in particular, as a through-opening through the head section and foot section. In other words, the screw channel runs, in particular, at least through the head section of the nut, so that the screw can be screwed into the nut and, in particular, into the head section of the nut. A through-opening allows the use of screws of different lengths.

[0013] It may be advantageous for the head section and / or the foot section to have an upper side that extends, in particular, substantially perpendicular to the screw axis, wherein the upper side is flat, in particular smooth. Smooth, in the context of the present application, means that the upper side, in particular, has no serrations. This design measure can be eliminated in the described connection system, since forces acting laterally to the screw axis are largely absorbed by the nut (in particular the head section).

[0014] In particular, the top of the head section and / or the foot section is arranged perpendicular to the screw axis.

[0015] According to the invention, the upper side of the foot section is designed to rest against a surface of the elements to be connected and to press them together.

[0016] The cage has a base section and a shell section adjacent to the base section. The cage defines a receiving space for the nut. The shell section has at least one opening through which the nut can be at least partially inserted into the receiving space. The base section of the cage can be flat, have elevations and / or depressions, and / or be ribbed, for example, to prevent the nut from slipping out.

[0017] The cage has a cover section, which adjoins the shell section and is spaced apart from the base section. Similar to the base section, the cover section of the cage can be flat, have elevations and / or depressions, and / or be ribbed, for example, to prevent the nut from slipping out. The cover section largely stabilizes the nut in the cage, allowing the screw to be screwed in easily.

[0018] A screw opening is provided for the passage of the screw in the base section and / or the cover section. The screw opening in the base section and the screw opening in the cover section can have the same shape and / or size. It is also conceivable for the screw opening in the base section and the screw opening in the cover section to have different shapes and / or sizes, since the screw opening does not necessarily have to provide a guide function for the screw.

[0019] The cage and nut are designed such that the nut can be inserted perpendicular to the screw axis through the opening in the shell section into the receiving space such that the screw channel aligns with the screw opening in the base section and / or the screw opening in the cover section. To connect, the screw can then be screwed through the screw opening in the cover section into the screw channel of the nut. This largely secures the screw or nut, preventing it from accidentally falling out of the cage.

[0020] Preferably, when the nut is inserted into the receiving space, the head portion is completely received in the receiving space. The foot portion can at least partially project beyond the receiving space through the opening in the shell portion.

[0021] It may be advantageous for the shell portion of the cage to have at least one inner surface facing the receiving space, in particular two opposing inner surfaces. The inner surface can provide a contact surface for a side surface of the foot portion and / or a side surface of the head portion such that, when the nut is inserted into the receiving space, the nut is fixed against rotation about the screw axis. In particular, the contact surface can be flat, have elevations and / or depressions, and / or be grooved, for example, to prevent the nut from slipping out.

[0022] The nut, in particular, has two opposing, flat surfaces. In particular, the side surface of the head section and the side surface of the foot section lie in one plane. The nut is therefore preferably designed to be flat on two opposite sides (each of the flat surfaces then encompasses one of the aforementioned side surfaces of the foot section and the adjacent side surface of the head section).

[0023] The base portion of the nut extends beyond the head portion, particularly at two opposite ends, but runs flush with the head portion between the two projecting areas (such that the flat surface is formed on the side of the nut). Generally speaking, the head portion and base portion are preferably the same width when viewed from the screw axis, but the base portion is longer than the head portion and therefore extends beyond the head portion.

[0024] The cage preferably has a cylindrical, in particular circular-cylindrical, outer shape. This allows the cage to be inserted into or pushed through an opening in the elements to be connected.

[0025] The base section and / or the cover section can, for example, extend flatly and have a round, in particular circular, outer circumference.

[0026] As a further embodiment, it is conceivable that the base section is larger than the cover section when viewed in projection along the screw axis. In particular, when viewed in projection along the screw axis, the base section can protrude beyond the cover section in the area of ​​the opening. In other words: in the top view of the connection system, the cover section and partially the base section of the connection system can be visible. In the view of the connection system from below, only the base section can be visible. This makes it possible to insert the cage with its base section through corresponding holes or slots in the components to be connected, whereby the smaller diameter of the cover section still allows the cage to be twisted and / or moved in a slot.

[0027] Preferably, at least two projections are provided on the cage, e.g. in the form of protruding wings or tabs. The projections are arranged in particular on the shell section of the cage and / or the cover section of the cage and, when screwed together, extend in particular away from the screw axis and are arranged in particular rotationally symmetrical and / or opposite one another with respect to the screw axis. Preferably, exactly two projections are provided, which are arranged on opposite sides of the cage. This allows the projections and thus the cage to be handled with a two-finger grip. More preferably, three projections can be arranged on the cage, so that the cage can be handled with a three-finger grip. The three-finger grip is particularly stable and comfortable to handle. In particular, the distance between the projections can be the same.

[0028] Preferably, at least one resilient element is provided on the base section. The resilient element can push the nut, in particular the foot section, away from the base section when the connection system is assembled. In other words, the resilient element pushes the nut away from the base section toward the screw or toward any cover section that may be present. Thus, in the assembled state, the nut is preloaded against the screw head, in particular along the screw axis. The resilient element can protrude into the receiving space of the cage or be designed such that it protrudes away from the receiving space or the casing section.

[0029] The resilient element can extend radially outward from the base section and / or the shell section in a wing-like manner, i.e., radially away from the screw axis. However, it is also conceivable for the resilient element to extend radially inward, i.e., radially toward the screw axis.

[0030] Particularly advantageously, two resilient elements are provided, which are arranged in particular on opposite sides of the base section.

[0031] The object to be achieved is further achieved by the arrangement according to the invention with the features of the independent claim. The arrangement thus represents a kit and comprises a connection system with the features described above, a first, in particular plate-like, element or component, and a second, in particular plate-like, element or component, wherein the first element and the second element each have at least one hole.

[0032] The hole has a shape corresponding to the nut and / or the bottom section of the cage, so that the cage with the nut inserted can be inserted into the hole.

[0033] For a further embodiment, the first element and / or the second element has a first elongated hole with two longitudinal sides. The distance between the longitudinal sides can correspond to the base section of the cage, so that the cage with the nut accommodated can be inserted into the elongated hole and the connecting system can be moved along the elongated hole. The movement of the connecting system along the first elongated hole is possible independently of any rotation of the connecting system about the screw axis.

[0034] Advantageously, the first element and / or the second element has a second elongated hole with two longitudinal sides, wherein the second elongated hole has a shape corresponding to the base section of the cage at at least one location. At this location, the distance between the two longitudinal sides can be greater than at another location of the second elongated hole, so that the movement of the connection system along the elongated hole can be blocked, in particular by rotating the cage by 90° around the screw axis. The connection system can only be inserted into and removed from the second elongated hole at these locations.

[0035] Advantageously, the connection system and the two elements are designed such that the first and second elements can be positioned between the nut and the cage, so that the cage, in conjunction with the nut, encloses the two elements. The two elements can thus be held or pressed together by the cage and nut, for example, as an assembly aid.

[0036] Further features, details, and advantages of the invention will become apparent from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. They show: Fig. 1 a perspective view of a connection system in a disassembled state; Fig. 2 a perspective view of the connection system according to Figure 1 in an assembled state; Fig. 3 a view of a section through the connection system according to Figure 1in a state connecting two elements; Fig. 4 a view of a perpendicular to the section in Figure 3 arranged section through the connection system according to Figure 1 in a state connecting two elements; Fig. 5 a perspective view of an arrangement according to the invention; Fig. 6 a further embodiment of a connection system; Fig. 7 a view of a section through the connection system according to Figure 6 and Fig. 8 a view of a section through another embodiment of the connection system.

[0037] In the following description and in the figures, corresponding components and elements bear the same reference symbols. For clarity, not all reference symbols are shown in all figures.

[0038] Figure 1shows a perspective view of a connection system 10 according to the invention in a disassembled state. The connection system 10 comprises a screw 12 and a nut 14. The screw 12 is shown only schematically and without an external thread. The nut 14 has a screw channel 17, which is designed as a through-opening and extends along a screw axis 15. The screw axis 15 is in Fig. 1 represented by a dashed line. The screw channel 17 has an internal thread (not shown), which corresponds to the external thread of the screw 12 (also not shown), so that the screw 12 can be screwed into the screw channel 17 of the nut 14.

[0039] The nut 14 has a base portion 22 and a head portion 20 adjacent to the base portion 22 along the screw axis 15. In the present case, the nut 14 is designed as a single piece. However, it is conceivable for the nut 14 to be designed as a single piece consisting of multiple elements. For example, the head portion 20 of the nut 14 can be designed as a single piece, and the base portion 22 of the nut 14 can be designed as a single piece.

[0040] In this case, the foot section 22 transitions into the head section 20 in a stepped manner. The flow section 22 projects beyond the head section on two opposite sides of the head and foot sections 20, 22, respectively, so that a stepped shape is formed on each of these opposite sides.

[0041] The head section 20 has a side surface 19, and the foot section 22 has a side surface 18. In the present case, these two surfaces are formed as a common flat side surface.

[0042] The head section 20 has an upper surface 21 arranged perpendicular to the screw axis 15, which in this case is flat. The foot section 22 also has a surface 21 arranged perpendicular to the screw axis 15, i.e., parallel to the upper surface 21 of the head section 20. The upper surface 21 of the foot section is also flat. In particular, the upper surfaces 21 have no serrations, since lateral forces (acting along the surfaces of the elements to be fastened) are absorbed by the head section 20.

[0043] The head section 20 has a substantially round outer shape on two opposite sides, where the foot section 22 and the head section 20 form a step shape.

[0044] The foot section 22 and the head section 20 each have a width and a length when viewed in projection along the screw axis 15. Preferably, the width of the foot section 22 is substantially equal to the width of the head section, so that the nut 14 has an overall substantially flat side surface. However, the foot section 22 is preferably longer than the head section 20, so that the foot section 22 projects beyond the head section 20 at least in sections in the direction perpendicular to the screw axis 15. For further configuration, the length and width of the head section 20 can be substantially equal. However, in the case of the foot section 22, the length is preferably greater than the width. In particular, the foot section 22 is substantially rectangular when viewed in projection along the screw axis 15.

[0045] The connection system 10 further comprises a cage 16. In this case, the cage 16 has a base section 46, an adjacent casing section 30, and a cover section 50 adjacent to the casing section 30. The base section 46 is flat or plate-shaped and has a screw opening 48 and a circular outer shape. The cover section 50 is also flat or plate-shaped and has a screw opening 48, which in this case has the same size and shape as the screw opening 48 of the base section 46. The cover section 50 has a substantially round outer shape.

[0046] Projections 32 are arranged on two opposite sides of the cover portion 50. In this case, the projections 32 are collar-like or wing-like and extend radially outward from the cover portion 50.

[0047] The cage 16 forms a receiving space 44 for the nut 14. In the present case, the receiving space 44 is delimited by the base section 46, the jacket section 30 and the cover section 50.

[0048] The casing section 30 has two openings 28 arranged on opposite sides of the casing section 30. Through these openings 28, the nut 14 can be inserted into the cage 16 and thus into the receiving space 44 intended for the nut 14.

[0049] In the present case, two opposite sides of the casing section 30 are flat on their inner surface 45, i.e., the surfaces facing the receiving space 44. These inner surfaces 45 are designed such that the nut 14, when inserted into the cage 16, rests with its side surfaces 18 and 19 on the inner surfaces 45. This fixes the nut 14 against rotation about the screw axis 15 with respect to the cage 16. Thus, the cage 16, together with the received nut 14, can be securely rotated and handled via the two projections 32.

[0050] In the example shown, a washer 13 is shown. To assemble the connection system 10, the nut 14 is pushed through one of the two openings 28 into the receiving space 44 so that the screw openings 48 of the base section 46 and the cover section 50 are aligned with the screw channel 17. Once the nut 14 is received in the cage 16 or its receiving space 44, the connection system can be handled by the extensions 32. The screw 12 is then inserted or screwed, if necessary, first through the washer 13, then through the screw opening 48 of the cover section 50, through the screw channel 17 of the nut 14, and finally through the screw opening 48 of the base section 46.

[0051] Figure 2 shows a perspective view of the connection system 10 according to Figure 1in an assembled state. In this state, the nut 14 is received in the cage 16 or the receiving space 44. The foot section 22 protrudes on two opposite sides from the receiving space 44 or from the cage 16 through the openings 28. The head section 20 of the nut 14 is arranged essentially within the receiving space 44. In the example shown, the two projections 32 are arranged perpendicular to the passage directions of the openings 28, viewed along the screw axis 15.

[0052] Figure 3 shows a view of a section through the connection system 10 according to Figure 1in a state connecting two elements 34, 36. To connect two elements 34, 36, the nut 14 is first inserted into the receiving space 44 of the cage 16. The cage 16, with the nut 14 received therein, can be handled by means of the two projections 32 from one side of an element 34, 36 to be connected. In other words, the cage 16, with the nut 14 received therein, can be held from the same side of an element 34, 36 to be connected, and the screw 12 can be screwed into the nut 14.

[0053] The elements 34, 36, designed as plates, are connected to one another by means of the connection system 10. By turning the screw 12, it is screwed into the internal thread of the screw channel 17 arranged in the nut 14. As a result, the nut 14 moves in the direction of the screw head (i.e. Fig. 3upwards). The upper side 21 of the foot section 22 protruding from the receiving space 44 presses against the second element 36 and presses this against the first element 34. The first element 34 is in turn pushed by the washer 13 in the opposite direction (i.e. in Fig. 3 downwards). Thus, the two elements 34, 36 are clamped between the base portion 22 of the nut 14 and the washer 13. Of course, this refers to the relative movement in each case.

[0054] Potential shear forces between the two elements 34 and 36 are absorbed by the head portion 20 of the nut 14. This relieves the load on the screw and prevents the shear forces between the two elements 34 and 36 from being transferred to the screw 12, which can otherwise be the weakest point in a screw connection.

[0055] Figure 4 shows a view of a plane perpendicular to the section in Figure 3arranged section through the connection system 10 according to Figure 1 in a state connecting two elements 34, 36. In the orientation shown, the shear forces are absorbed not only by the head section 20 but also at least partially by the shell section 30. This leads to further relief of the screw 12.

[0056] Figure 5 shows a perspective view of an arrangement 11 according to the invention. Shown is a first element 34 which is designed in the form of a substantially triangular angle element and a second element 36 which is designed in the form of an angular profile.

[0057] The second element 36 in this case has a plurality of holes 38. The holes 38 have a shape that corresponds to the shape of the base section 46 and the nut 14 when the nut 14 is received in the cage 16 or the receiving space 44. Thus, the connection system 10 can be pushed through such a hole 38. In one orientation, the connection system can be pushed through such a hole 38, wherein pushing through in an orientation rotated by 90° is preferably blocked due to the shape of the hole 38. If the connection system 10 is rotated, for example, by 90° about the screw axis 15 after it has been pushed through the hole 38, the sections of the foot section 22 of the nut 14 that protrude from the cage 16 or the receiving space 44 prevent the connection system 10 from being pulled out of the hole 38. In this rotated state, the connection system 10 can connect two elements to one another (cf. Figure 4 ).

[0058] The first element 34 has a first elongated hole 40. The first elongated hole 40 has two longitudinal sides 42. The distance between the two longitudinal sides 42 of the first elongated hole 40 corresponds to the diameter and thus the widest point of the base section 46 of the cage 16. This allows the connection system 10 to be displaced along the first elongated hole 40. Once the connection system 10 has been inserted through the first elongated hole 40, the connection system 10 can be displaced along the elongated hole 40 even after rotation about the screw axis 15, since the distance between the two sides 42 is correspondingly large.

[0059] Furthermore, the first element 34 has a second elongated hole 52. The second elongated hole has two longitudinal sides 54, wherein in this case a plurality of points 56 are arranged along the second elongated hole 52, at which the distance between the longitudinal sides 54 corresponds to the diameter and thus the widest point of the base section 46 of the cage 16. The distance between the longitudinal sides 54 is greatest at these points. Accordingly, at other points of the second elongated hole 52 the distance between the longitudinal sides 54 is smaller. The connection system 10 can only be inserted into and removed from the second elongated hole 52 at points 56 (in particular those with a large distance between the longitudinal sides 54). The minimum distance between the longitudinal sides 54 corresponds in particular to the width of the head section 20 of the nut 14 and, if applicable, of the surrounding cage.

[0060] Thus, the connection system 10 with the nut 14 accommodated in the cage 16 can be pushed through the second elongated hole 52. After the connection system 10 has been pushed through the second elongated hole 54 at one of the points 56, the connection system 10 is blocked against displacement along the second elongated hole 52. The outer shape of the casing section 30 corresponds to the shape of the base section 46, so that, with the exception of the openings 28, the casing section 30 has a circular-cylindrical outer shape. This blocks displacement along the second elongated hole 52.

[0061] By rotating by 90° around the screw axis 15, a displacement along the second elongated hole 52 can be enabled. By such a rotation, the cage 16 with its shell section 30 is rotated around the screw axis 15 such that the openings 28 of the shell section 30 are arranged along the longitudinal sides 54. The circular cylindrical shape of the outer shape of the shell section 30 is interrupted by the openings 28. Due to the openings 28 in the shell section 30, the cage 16 has a smaller extension in this orientation, which can correspond to the minimum distance between the longitudinal sides 54. Figure 5 The example shown represents a state in which the connection system 10 can be moved along the elongated hole 52.

[0062] Figure 6shows a further embodiment of the connection system 10. In the present case, the base section 46 is elongated and has two resilient elements 47. These are arranged on opposite sides of the base section 46 (at the two ends of the long side of the base section 46) and protrude radially inward and upward from the base section 46 with respect to the screw axis 15, i.e. into the receiving space 44. The resilient elements 47 represent, in particular, resilient projections of the base section 46. In particular, the resilient elements 47 are designed in the manner of spring tabs or leaf springs. The two resilient elements 47 are generally designed such that they preload the nut 14 in the direction of the screw 12 when the connection system 10 is in the assembled state, i.e. when the nut 14 is received in the cage 16.

[0063] In other words, the spring elements 47 push the nut 14 upwards, towards the screw head.

[0064] Figure 7 shows a view of a section through the connection system 10 according to Figure 6 . The assembled state of the connection system 10 is shown here. The resilient elements 47 press the nut 14 toward the screw head (in particular, away from the base section 46). In the example shown, the nut 14 is pressed against the cover section 50 with the top side 21 of the head section 20. The two resilient elements 47 can be formed integrally with the base section 46. In other words, the resilient elements 47 can be part of the base section 46.

[0065] Figure 8shows a view of a section through a connection system 10, in which the resilient elements 47 do not protrude towards the central longitudinal axis (i.e. into the receiving space 44, radially inwards), but radially outwards (i.e. away from the central longitudinal axis or from the receiving space 44).

Claims

1. Connection system (10) for connecting at least two, in particular plate-like, elements, the connection system (10) comprising a screw (12), a nut (14) corresponding to the screw (12) and having a screw channel (17) which extends along a screw axis (15) and into which the screw (12) can be screwed, and a cage (16) for receiving the nut (14), the nut (14) having a foot portion (22) and a head portion (20) which adjoins said foot portion along the screw axis (15), the foot portion (22) projecting, at least in portions, beyond the head portion (20) in a direction perpendicular to the screw axis (15), and the foot portion (22) having an upper surface (21), the upper surface (21) being designed to abut a surface of the elements in order to connect the elements, the cage (16) having a base portion (46) and a casing portion (30) which adjoins the base portion and delimits a receiving space (44) for the nut (14), the casing portion (30) having at least one opening (28) through which the nut (14) can be pushed, at least in part, into the receiving space (44), the cage (16) having a cover portion (50), the cover portion (50) adjoining the casing portion (30) and being arranged at a distance from the base portion (46), a screw opening (48) for the screw (12) to pass through being provided in the base portion (46) and / or the cover portion (50), characterized in that the cage (16) and the nut (14) are designed such that the nut (14) can be pushed through the opening (28) in the casing portion (30) into the receiving space (44) in the direction perpendicular to the screw axis (15), such that the screw channel (17) is aligned with the screw opening (48) in the base portion (46) and / or the screw opening (48) in the cover portion (50) and such that the head portion (20) of the nut (14) is suitable to be passed through the elements to be fastened together.

2. Connection system (10) according to claim 1, characterized in that the foot portion (22) and the head portion (20) of the nut (14) transition into one another in a stepped manner.

3. Connection system according to claim 1 or 2, characterized in that the screw channel (17) extends through the head portion (20) and through the foot portion (22), in particular is designed as a through-opening through the head portion (20) and the foot portion (22).

4. Connection system (10) according to any of the preceding claims, characterized in that the upper surface (21) is flat, in particular smooth.

5. Connection system (10) according to any of the preceding claims, characterized in that when the nut (14) is pushed into the receiving space (44), the head portion (20) is completely received in the receiving space (44) and the foot portion (22) protrudes, at least in part, from the receiving space (44) through the opening (28) in the casing portion (30).

6. Connection system (10) according to any of the preceding claims, characterized in that the casing portion (30) of the cage (16) has at least one inner surface (45) facing the receiving space (44), the inner surface (45) providing a contact surface for a side surface (18) of the foot portion (22) and / or a side surface (19) of the head portion (20) such that when the nut (14) is pushed into the receiving space (44), the nut (14) is secured against rotation about the screw axis (15).

7. Connection system (10) according to any of the preceding claims, characterized in that the cage (16) has a cylindrical, in particular a circular-cylindrical, outer shape.

8. Connection system (10) according to any of the preceding claims, characterized in that the base portion (46) and / or the cover portion (50) extend in a planar manner and have a round, in particular circular, outer circumference.

9. Connection system (10) according to any of the preceding claims, characterized in that, when viewed in projection along the screw axis (15), the base portion (46) is larger than the cover portion (50), in particular in that the base portion (46) protrudes beyond the cover portion (50) in the region of the opening (28).

10. Connection system (10) according to any of the preceding claims, characterized in that at least two projections (32) are provided on the cage (16), which adjoin the casing portion (30) of the cage (16) and / or the cover portion (50) of the cage (16) and in particular extend away from the screw axis (15) and in particular are rotationally symmetrical and / or opposite one another with respect to the screw axis (15).

11. Connection system (10) according to any of the preceding claims, characterized in that at least one resilient element (47) is arranged on the base portion (46) such that the resilient element (47) pushes the nut (14), in particular the foot portion (22), away from the base portion (46) in the assembled state of the connection system (10).

12. Arrangement (11) comprising a connection system (10) according to any of the preceding claims, a first, in particular plate-like, element (34) and a second, in particular plate-like, element (36), wherein the first element (34) and the second element (36) have at least one hole (38), wherein the hole (38) has a shape corresponding to the nut (14) and / or to the base portion (46) of the cage (16) such that the cage (16), together with the received nut (14), can be introduced into the hole (38).

13. Arrangement (11) according to claim 12, characterized in that the first element (34) and / or the second element (36) has a first elongate hole (40) having two longitudinal sides (42) and the distance between the longitudinal sides (42) corresponds to the base portion (46) of the cage (16) such that the cage (16), together with the received nut (14), can be introduced into the elongate hole (40) and the connection system (10) can be moved along the elongate hole (40).

14. Arrangement (11) according to claim 12 or 13, characterized in that the first element (34) and / or the second element (36) comprises a second elongate hole (52) having two longitudinal sides (54), the second elongate hole (52) having a shape corresponding to the base portion (46) of the cage (16) at at least one point (56), the distance between the two longitudinal sides (54) being greater at this point (56) than at another point of the second elongate hole (52) such that the movement of the connection system (10) along the elongate hole (52) can be blocked, in particular by rotating the cage (16) by 90° about the screw axis (15).

15. Arrangement (11) according to any of claims 12 to 14, characterized in that the connection system (10), the first element (34) and the second element (36) can be positioned such that the two elements (34, 36) can be clamped between the cage (16) and the nut (14).