Sliding block and connecting assembly comprising same

Abstract

The invention relates to a sliding block (10, 20, 30, 40) and to a connecting assembly comprising a sliding block and a rotary closure. The sliding block (10, 20, 30, 40) is designed to be inserted into a profiled groove of a profiled rail (1). The sliding block (10, 20, 30, 40) has a lower face (11, 21, 31, 41), an opposite upper face (12, 22, 32, 42), two opposing holding portions (13, 23, 33, 43), which extend substantially transversely to the longitudinal direction of the sliding block, and at least one connecting portion (14, 24, 34, 44), which lies between the holding portions and has an opening in the upper face for receiving a connecting element. This opening in the connecting portion (14, 24, 34, 44) is a non-circular through-opening (15, 25, 35, 45), which runs from the upper face to the lower face. The connecting portion (14, 24, 34, 44) has a locking contour (16, 26, 36, 46, 50) with at least one latching recess (16 a, 36 a, 52) facing away from the upper face (12, 22, 32, 42).

Description

[0001]

[0002] T-nut and connecting arrangement herewith

[0003] The invention relates to a T-nut and a connecting arrangement with a T-nut and a rotary lock, for example in the form of a connecting pin.

[0004] In various applications within mechanical and plant engineering, profile rails with profile grooves (i.e., grooves with undercuts) are used to quickly and easily create customized designs. These profile rails are often extruded aluminum structural profiles with multiple open profile grooves running lengthwise, which can be easily connected using suitable fasteners. T-nuts have become particularly popular as fasteners; these can be inserted or pivoted into the profile grooves. These T-nuts have a threaded bore and can be moved within the groove. Screws inserted into the T-nuts allow the profile rails to be connected to each other or to which various components can be attached. An example of a construction using profile rails and T-nuts is described in EP 0490 086 B1.

[0005] Inserting and tightening the screws requires a tool and is comparatively time-consuming. In contrast, the object of the present invention is to provide a T-nut and a fastening element that enable particularly simple mounting of components to the profile groove.

[0006] This problem is solved with a T-nut according to claim 1 and a fastening element according to claim 12.

[0007] February 27, 2025 C 8 P 153 WO

[0008]

[0009] A T-nut for insertion into a profile groove of a profile rail has a bottom, an opposite top, two opposing retaining sections extending substantially transversely to the longitudinal direction of the T-nut, and at least one connecting section located between the retaining sections with an opening in the top for receiving a connecting element. The longitudinal direction of the T-nut is the longitudinal direction of the profile groove and the profile rail when the T-nut is inserted into a profile groove. The terms "transverse" and "longitudinal" are used here in relation to the longitudinal direction of the profile groove and regardless of the size of the rail, i.e., even if the width of the T-nut exceeds its length. The terms "top" and "bottom" refer to the use of the T-nut in an upward-facing groove.The underside of the T-nut thus points towards the bottom of the groove and the top side points towards the opening of the groove or may protrude from it.

[0010] In principle, a T-nut according to the invention is designed to be inserted or pivoted into a profile groove of a profile rail and locked there. According to one aspect of the invention, the connecting section has a non-circular through-opening for receiving a rotary lock, in particular a pin-like quarter-turn lock with a cross-pin area, which extends from the top to the bottom. The term "through-opening" refers to openings that are initially accessible from both sides, i.e., from the top and the bottom. However, the term "through-opening" also includes examples where a cap or a locking element is attached or inserted at one end of the opening, e.g., on the bottom. Furthermore, the connecting section has a locking contour with at least one detent recess for locking such a rotary lock on the bottom.In other words, the T-nut is designed and configured to work together with one.

[0011] February 27, 2025 C 8 P 153 WO

[0012]

[0013] Rotary locks form a connection arrangement to connect profile rails to each other or to attach any elements to them.

[0014] With the inventive design of the T-nut, it is possible to create a connection more quickly and easily than with conventional screws. For example, to lock a rotary fastener, usually only insertion and a 90° turn are required to establish a secure connection. This can sometimes be done without tools if the head of the rotary fastener has suitable gripping surfaces for manual handling, or may require the use of a tool. Structures can also be provided in the connection section that allow a rotary fastener, which can be rotated in any orientation, to be guided into a desired position while being inserted into the through-hole. This simplifies assembly, particularly in cases where one or more T-nuts are to be concealed, for example, by components being mounted.

[0015] In detail, the non-circular through-hole can be a cylindrical through-hole to which at least one elongated hole or recess is attached, for example, a contour like a classic keyhole. For the use of a rotary lock with a cross pin, i.e., a pin from whose shaft detent projections extend on two opposite sides, it is preferred if the non-circular through-hole is a cylindrical through-hole to which two elongated holes extending longitudinally along the T-nut are attached, e.g., essentially opposite each other. Various configurations of the connecting section are possible. The elongated holes can be arranged directly opposite each other, i.e., at an angle of 180° to each other, or at an angle of approximately 90° to approximately 180° to each other.It is preferred that there is a continuous opening between the top and bottom surfaces into which the shaft of a rotatable pin can be inserted, and that a [missing word] from the [missing word] [missing word].

[0016] February 27, 2025 C 8 P 153 WO

[0017]

[0018] The protruding pin, e.g., a cross-pin area, can be guided from the top to the bottom through the T-nut. The elongated hole does not need to have a constant contour across the height of the T-nut (from top to bottom); guide ramps can be provided to align the rotary fastener.

[0019] In a simple embodiment of the T-nut, the detent recess can be formed as at least one groove in the underside, extending adjacent to the cylindrical through-hole. Here, the at least one detent recess can extend at an angle of 60° to 120°, particularly approximately 90°, to the at least one elongated hole. Alternatively or additionally, the locking contour can have a cam contour with a ramp and a recessed retaining area formed by the detent recess. In particular, a ramp, for example, helical in shape, can be provided, which can form a guide surface for a cross-pin section of a rotary lock, extending from the elongated hole to the retaining area and moving away from the top surface. The recessed retaining area, on the other hand, is closer to the top surface relative to the end of the ramp adjacent to it.

[0020] For some applications, it is advantageous to be able to temporarily fix a T-nut within the profile groove, for example, by ensuring that the T-nut can only be moved within the profile groove against a certain frictional resistance. For this purpose, the T-nut can have a receptacle on its underside for a ball or pin, which can be moved by means of a compression spring from a position in which the ball or pin is essentially flush with the underside into the receptacle to a position in which the ball or pin protrudes from the underside. The spring-loaded ball or pin is thus oriented so that it is pressed against the bottom of the profile groove and thereby fixes the T-nut in the profile groove.

[0021] February 27, 2025 C 8 P 153 WO

[0022]

[0023] This allows it to be moved against resistance. This design is particularly suitable for metal T-nuts.

[0024] Alternatively or additionally, a spring element can be provided on the underside and / or side of one or both retaining sections, which, in its unloaded position, projects away from the underside or the retaining sections. This also makes it possible to fix the T-nut in the profile groove in such a way that it can be moved against resistance. This design, in which the spring element can be formed integrally with the T-nut, is particularly suitable for T-nuts made of plastic.

[0025] The T-nut according to the invention is not limited to a specific design or outer contour; rather, various designs are possible that allow the T-nut to be inserted or pivoted into a profile groove of a profile rail and to be fastened there.

[0026] If, for example, the profile groove has an approximately T-shaped cross-section (perpendicular to the longitudinal direction), the T-nut can also have a T-shaped cross-section.

[0027] For example, in the case of a C-shaped or dovetail-shaped groove, such as that shown for the profile rail in EP 0490086 B1, the underside can be convexly curved and / or the longitudinal edges of the top side can be chamfered or recessed. This design makes it possible to pivot the T-nut into the profile groove, thus eliminating the need for the tedious insertion of the T-nuts from one end of the rail, which is particularly difficult with long profile rails.

[0028] Alternatively, it is also possible to design the T-nut in such a way that the retaining sections on the underside form a parallelogram with two different

[0029] February 27, 2025 C 8 P 153 WO

[0030]

[0031] long baselines are formed that run at an angle of 40° to 80°, particularly 60°, to each other. For example, if the profile rail has a profile groove with a slot running in cross-section (perpendicular to its longitudinal direction) in an outer surface of the profile rail and a retaining area offset inwards from the slot, which has a greater width than the slot, and if the height on the shorter baseline of the parallelogram formed by the retaining sections is less than or equal to the width of the slot, and the height of the longer of the two baselines of the parallelogram formed by the retaining sections is greater than the width of the slot, the T-nut can also be easily inserted into the profile groove. For this purpose, the T-nut is aligned so that it can be inserted through the slot into the profile groove.It can then be rotated in the profile groove so that the holding areas lie in the undercut areas of the groove, thus securing the T-nut against falling out.

[0032] A connection arrangement according to the invention for insertion into a profile groove of a profile rail comprises a T-nut of the type mentioned above and a rotary lock, which can, for example, be designed as a pin or stud having a shaft with an enlarged head area at one end and a cross-shaped pin area at the opposite end. Such a rotary lock can be quickly and reliably connected to the T-nut to fix it in the profile groove.

[0033] In this connection arrangement, the non-circular through-opening of the connecting section and the detent recess of the locking contour can be adapted to the cross-pin area in such a way that the cross-pin area can be passed through the non-circular through-opening and locked into the detent recess. It can be advantageous if the rotary lock has an elastically deformable preload element located between the head area and the cross-pin area of ​​the pin, encompassing the shaft.

[0034] February 27, 2025 C 8 P 153 WO

[0035]

[0036] This holds the rotary lock in the locked position as soon as the cross pin area engages in the detent.

[0037] The connection arrangement can further comprise at least one profile rail with a profile groove, in particular with a profile groove which has a cross-section transverse to its longitudinal direction with a slot extending in an outer surface of the profile rail and a holding area offset inwards relative to the slot, which has a greater width than the slot.

[0038] The invention is explained in more detail below with reference to exemplary embodiments and the drawing.

[0039] They show schematically:

[0040] Figure 1a shows a perspective view of a T-nut according to a first embodiment of the invention,

[0041] Figure 1b shows the T-nut according to Figure 1a in a partially cut-away perspective view.

[0042] Figure 1c shows the top side of the T-nut according to Figure 1a in a top view.

[0043] Figure 1d shows the underside of the T-nut according to Figure 1a in top view.

[0044] Figure 1e in perspective view shows the T-nut according to Figure 1a with a rotary lock,

[0045] Figure 1f shows, in a partially cut-away perspective view, the T-nut according to Figure 1a with a rotary lock in a profile rail,

[0046] February 27, 2025 C 8 P 153 WO

[0047]

[0048] Figure 2a shows a perspective view of a T-nut according to a second embodiment of the invention,

[0049] Figure 2b shows the T-nut according to Figure 2a in a profile rail in a first position in a sectional view,

[0050] Figure 2c shows the top side of the T-nut according to Figure 2a in the profile rail in the first position,

[0051] Figure 2d shows the T-nut according to Figure 2a in a profile rail in a second position in a sectional view,

[0052] Figure 2e in top view shows the top side of the T-nut according to Figure 2a in the profile rail in the second position,

[0053] Figure 3a shows a perspective view of a T-nut according to a third embodiment of the invention during pivoting into a profile rail.

[0054] Figure 3b in perspective view shows the T-nut according to Figure 3a with a rotary lock,

[0055] Figure 3c shows the underside of the T-nut according to Figure 3a in perspective view.

[0056] Figure 3d in perspective view of the top side, the T-nut according to Figure 3a

[0057] Figure 3e shows a sectional view of the T-nut according to Figure 3a with a rotary lock in a profile rail,

[0058] February 27, 2025 C 8 P 153 WO

[0059]

[0060] Figure 4a shows a perspective view of the top surface of a T-nut according to a fourth embodiment of the invention.

[0061] Figure 4b shows the underside of the T-nut according to Figure 4a in perspective view, and

[0062] Figure 5 shows a perspective view of a connecting section of a T-nut.

[0063] The T-nut 10 shown in Figures 1a to 1f according to the first embodiment has essentially a T-shaped cross-section and is suitable for use in a matching profile groove (Figure 1f) of a profile rail 1, which also has an approximately T-shaped cross-section. An element 3, shown here as a plate, can be attached to the profile rail 1 by means of the T-nut 10 together with a rotary fastener 2.

[0064] The rotary lock 2 is designed as a pin with a shaft 4 having an enlarged head 5 at one end, featuring a tool engagement point, for example a slot, and a cross pin 6 at the opposite end. The rotary lock 2 further includes an elastically deformable preload element 7, such as a compression spring (Figure 1f), disc springs (Figure 3e), or an elastomer element, between the head 5 and the cross pin 6 of the pin. Instead of the cross pin 6 inserted into the pin, a cross pin area can also be provided by a projection on both sides formed integrally with the pin.

[0065] As can be seen in particular from Figures 1f, 2b, 2d, 3a and 3e, the profile rail 1 can have several profile grooves, each of which has a slot 8 extending longitudinally in the outer surface of the profile rail 1 and a retaining area 9 offset inwards relative to the slot 8, which has a greater width than the slot 8. The cross-sectional shape of the slot 8 and the

[0066] February 27, 2025 C 8 P 153 WO-IQ-

[0067]

[0068] The holding area 9 can vary as shown, and the respective T-nuts are adapted in their contour to the profile grooves.

[0069] The T-nut 10 according to the first embodiment has a bottom surface 11, an opposing top surface 12, two opposing retaining sections 13, and a connecting section 14 located between the retaining sections 13. The retaining sections 13 project transversely from the central connecting section 14 to the longitudinal direction of the T-nut 10. The connecting section 14 is provided with a non-circular through-opening 15 that extends from the top surface 12 to the bottom surface 12. In the illustrated example, the through-opening 15 has a central cylindrical opening 15a from which two longitudinally oriented elongated holes 15b branch off, so that the rotary lock 2 with its cylindrical shaft 4 can be inserted into the cylindrical opening 15a and the elongated holes 15b receive the cross pin 6.

[0070] The through-opening 15 further features a locking contour 16 with at least one detent recess 16a on its underside 11. In a particularly simple embodiment, the detent recess can be designed as a double-sided groove, offset by approximately 90° to the elongated holes 15b as shown in Figure 1d. The cross pin 6 engages in this groove and is held by the spring tension 7 after the rotary lock 2 has been inserted into the through-opening 15 and rotated 90° relative to the T-nut 10. This locking position of the rotary lock 2 is shown in Figures 1e and 1f. Figure 1b, in particular, shows an additional rotation stop 16b, which prevents the rotary lock 2 from rotating beyond 90°.

[0071] Figure 1f shows how the element 3 can be attached to the profile rail 1 using the rotary lock 2 and the T-nut 10. In the locking position shown in the figure, the retaining sections 13 of the T-nut 10 are

[0072] February 27, 2025 C 8 P 153 WO

[0073]

[0074] The spring 7 clamps the element 3 against the retaining areas 9 of the profile groove, and the element 3 is additionally pressed against the outer surface of the profile rail 1. The cross pin 6 is held in the detent recess 16a, thus preventing unintentional rotation of the rotary lock 2, which would be necessary to release the connection. This can only occur if pressure is applied to the rotary lock 2 in the direction of the profile rail 1 and the rotary lock 2 is rotated relative to the T-nut 10 so that the cross pin 6 is again located in the elongated holes 15b.

[0075] A T-nut 20 according to a second embodiment is shown in Figures 2a to 2e. The T-nut 20, similar in principle to the T-nut 10 of the first embodiment, has a bottom surface 21, a top surface 22, two lateral retaining sections 23 and a central connecting section 24 with a through-opening 25.

[0076] In contrast to the first embodiment, the elongated holes 25b adjacent to the cylindrical opening 25a do not extend to the top surface 22 of the T-nut. Instead, one of the insertion ramps 26 is formed there within an enlarged cylindrical insertion area. This design with the insertion ramp 26 allows the rotary lock 2 to be inserted into the T-nut 20 with the cross pin 6 initially in any orientation. If the cross pin 6 is not yet precisely aligned with the elongated holes 25b, the insertion ramp 26 guides the cross pin 6 into the correct orientation.

[0077] A further difference from the first embodiment lies in the contour of the retaining sections 23 and the central connecting section 24. On the underside 21, the retaining sections 23 and the connecting section 24 form a parallelogram with two baselines of different lengths, which in the illustrated example run at an angle of approximately 60° to each other. The height H1 of the shorter baseline of the parallelogram formed by the retaining sections 23

[0078] February 27, 2025 C 8 P 153 WO

[0079]

[0080] The parallelogram, as can be seen in Figures 2b and 2c, is slightly smaller than or equal to the width of the slot 8. This allows the T-nut 20 to be inserted into the slot 8 from the outer surface of the profile rail 1 in the orientation shown in Figures 2b and 2c relative to the profile rail 1. In contrast, the height H2 of the longer of the two baselines of the parallelogram formed by the retaining sections 23 is greater than the width of the slot 8. This allows the retaining sections 23 to engage behind the retaining area 9 when the T-nut 20 is rotated approximately 60° within the profile groove, as shown in Figures 2d and 2e. Such a rotation occurs, for example, when the rotary lock 2 is rotated relative to the profile rail 1, thereby engaging the T-nut 20, when the cross pin 6 reaches a rotation stop in the T-nut 20.

[0081] A T-nut 30 according to a third embodiment is shown in Figures 3a to 3e. Similar to the T-nuts 10 and 20 of the previous embodiments, the T-nut 30 has a bottom surface 31, a top surface 32, two lateral retaining sections 33, and a central connecting section 34 with a through-opening 35, which is designed with a cylindrical opening 35a and longitudinally extending elongated holes 35b. In the area of ​​the bottom surface 31, a detent recess 36a on both sides and rotation stops 36b are again provided.

[0082] In contrast to the previous embodiments, the underside 31 is convexly curved, and the longitudinal edges of the upper surface 32 are recessed. This, together with the slightly modified design of the retaining areas 9 of the profile rail 1, which, as shown in Figures 3a and 3e, have approximately C-shaped profile grooves in cross-section, makes it possible to pivot the T-nut 30 into the profile groove, as indicated in Figure 3a.

[0083] February 27, 2025 C 8 P 153 WO

[0084]

[0085] Additionally, Figures 3b and 3c show a receptacle 37 for a ball 38 in the underside 31. The ball 38 can be moved by a compression spring (not shown), also inserted into the receptacle 37, from a position in which the ball 38 is pressed into the receptacle essentially flush with the underside 31, to a position in which the ball 38 protrudes slightly from the underside 31. As shown in Figure 3e, the ball 38 then presses against the bottom of the profile groove of the profile rail 1. This allows the T-nut 30 to be fixed in the profile groove in such a way that it can only be moved longitudinally within the profile groove after overcoming a frictional resistance.

[0086] A T-nut 40 according to a fourth embodiment is shown in Figures 4a to 4b. Similar to the T-nut 10 of the first embodiment, the T-nut 40 has an approximately T-shaped cross-section. The underside 41 may have recesses (see Figure 4b), while the top side 34 may be closed. Lateral spring elements 46 are formed on the lateral retaining sections 43, which are provided on both sides of the central connecting section 44 with a through-opening 45. These spring elements act on the retaining areas 9 of the profile rail 1. This allows the T-nut 40 to be fixed in the profile groove in such a way that it can only be moved longitudinally within the profile groove after overcoming a frictional resistance.

[0087] In general, T-nuts 10, 20, 30, and 40 can be made from materials such as metal or plastic. T-nut 40 is particularly suitable for plastic construction, whereas T-nuts 10, 20, and 30 can be made from metal.

[0088] In contrast to the design of the locking contour 16 with the detent recess 16a and the rotation stop 16b shown in particular in Figures 1b and 1d, the T-nuts can also have a design as shown in Figure 5.

[0089] February 27, 2025 C 8 P 153 WO- 14 -

[0090] A locking contour 50 is provided. In the locking contour 50, a helically extending ramp 53 is provided between the elongated hole 51 and the detent recess 52. Together with the ramp 53 and the recessed holding area of ​​the detent recess 52, a cam contour is formed that guides the cross pin 6 to the detent recess 52.

[0091] Features that are shown or explained here only in relation to individual embodiments, such as the spring-loaded ball 38, the spring elements 46 or the locking contour 50, can also be applied to T-nuts of the other embodiments.

[0092] Furthermore, the inventive principle of fastening a rotary closure, in particular a quarter rotary closure, in a T-nut 10, 20, 30, 40 is also applicable to T-nuts whose contour is adapted to profile grooves with cross-sections other than the T-shaped or C-shaped cross-sections described by way of example.

[0093] February 27, 2025 C 8 P 153 WO

[0094]

[0095] Reference sign

[0096] 1 profile rail 26 entry ramp

[0097] 2 twist locks

[0098] 30 T-nuts

[0099] 3 Element

[0100] 31 Underside

[0101] 4 shaft

[0102] 32 Top

[0103] 5 Head area

[0104] 33 Stop section

[0105] 6 Cross pin (area)

[0106] 34 Connecting section

[0107] 7 Preload element

[0108] 35 Passage opening

[0109] 8 slots

[0110] 35a cylindrical opening

[0111] 9 Holding area

[0112] 35b Slotted hole

[0113] 10 slot nut 36a locking recess

[0114] 11 Underside 36b Rotary stop

[0115] 12 Top side 37 Intake

[0116] 13 Holding section 38 Ball

[0117] 14 Connecting section

[0118] 40 T-nuts

[0119] 15 Through opening

[0120] 41 Underside

[0121] 15a cylindrical opening

[0122] 42 Top

[0123] 15b Slotted hole

[0124] 43 Stop section

[0125] 16 Locking contour

[0126] 44 Connecting section

[0127] 16a Rastvertiefung

[0128] 45 Passage opening

[0129] 16b Rotary stop

[0130] 46 spring elements

[0131] 20 T-nuts

[0132] 50 Locking contour

[0133] 21 Underside

[0134] 51 Slotted hole

[0135] 22 Top

[0136] 52 Raster recess

[0137] 23 Stop section

[0138] 53 Ramp

[0139] 24 Connecting section

[0140] 25 Through opening H1 Height of the shorter baseline 25a Cylindrical opening H2 Height of the longer baseline 25b Slotted hole

[0141] February 27, 2025 C 8 P 153 WO

Claims

Claims:

1. T-nut for insertion into a profile groove of a profile rail (1), wherein the T-nut (10, 20, 30, 40) has a bottom (11, 21, 31, 41), an opposite top (12, 22, 32, 42), two opposing retaining sections (13, 23, 33, 43) extending substantially transversely to the longitudinal direction of the T-nut, and at least one connecting section (14, 24, 34, 44) located between the retaining sections with an opening in the top for receiving a connecting element, characterized in that the opening in the connecting section (14, 24, 34, 44) is a non-circular through-opening (15, 25, 35, 45) extending from the top to the bottom, and the connecting section (14, 24, 34, 44) locking contour (16, 26, 36, 46, 50) with at least one detent recess (16a, 36a, 52) facing away from the top surface (12, 22, 32, 42).

2. T-slot nut according to claim 1, characterized in that the non-circular through-hole (15, 25, 35, 45) is a cylindrical through-hole (15a, 25a, 35a) to which at least one elongated hole (15b, 25b, 35b, 51) is attached.

3. T-slot nut according to claim 2, characterized in that the non-circular through-opening (15, 25, 35, 45) is a cylindrical through-opening (15a, 25a, 35a) to which two opposing elongated holes (15b, 25b, 35b, 51) extending in the longitudinal direction of the T-slot nut are connected.

4. T-nut according to claim 2 or 3, characterized in that the locking recess (16a, 36a, 52) is formed as at least one of the upper surfaces (12, 22, 32, 42) February 27, 2025 C 8 P 153 WO a groove is formed on the opposite side, which extends adjacent to the cylindrical through-opening (15a, 25a, 35a).

5. T-nut according to one of claims 2 to 4, characterized in that the at least one detent recess (16a, 36a, 52) extends at an angle of 60° to 120°, in particular 90°, to the at least one elongated hole (15b, 25b, 35b, 51).

6. T-nut according to claim 4 or 5, characterized in that the locking contour (16, 26, 36, 46, 50) has a cam contour with a ramp (53) and a holding area recessed relative to the ramp, which is formed by the detent recess (52).

7. T-nut according to one of the preceding claims, characterized in that it has on the underside (31) a receptacle (37) for a ball (38) which can be moved by means of a compression spring from a position in which the ball (38) is pressed into the receptacle (37) substantially flush with the underside (31) to a position in which the ball (38) protrudes from the underside (31).

8. T-nut according to one of claims 1 to 6, characterized in that a spring element (46) is provided on the underside and / or on the retaining sections (43), which in its unloaded position projects away from the underside or the retaining sections (43).

9. T-nut according to one of the preceding claims, characterized in that the underside (31) is convexly curved and / or that longitudinally extending edges of the top (32) are chamfered or recessed. February 27, 2025 C 8 P 153 WO- 18 - 10. T-nut according to one of claims 1 to 8, characterized in that the retaining sections (23) on the underside form a parallelogram with two baselines of different lengths which run at an angle of 40° to 80°, in particular 60° to each other.

11. T-nut according to one of the preceding claims, characterized in that the T-nut (10, 20, 30, 40) is made of metal, a metal alloy and / or plastic.

12. Connection arrangement for insertion into a profile groove of a profile rail (1) with a T-nut (10, 20, 30, 40) according to one of the preceding claims and a rotary lock (2) with a pin having a shaft (4) with an enlarged head area (5) provided at one end and with a cross pin area (6) provided at its opposite end, characterized in that the non-circular through-opening (15, 25, 35, 45) of the connecting section (14, 24, 34, 44) and the detent recess (16a, 36a, 52) of the locking contour (16, 26, 36, 46, 50) are adapted to the cross pin area (6) such that the cross pin area (6) can pass through the non-circular through-opening (15, 25, 35, 45) and engage in the detent recess (16a, 36a, 52) can be locked.

13. Connection arrangement according to claim 12, characterized in that the rotary lock (2) has an elastically deformable preload element (7) arranged between the head region (5) and the cross pin region (6) of the pin, encompassing the shaft (4).

14. Connection arrangement according to claim 12 or 13, further comprising at least one profile rail (1) with a profile groove, characterized in that the profile groove has a cross-section transverse to its longitudinal direction with a slot (8) extending in an outer surface of the profile rail (1) and a February 27, 2025 C 8 P 153 WO- 19 - has a retaining area (9) offset inwards from the slot (8), which has a greater width than the slot (8).

15. Connection arrangement according to claim 14 with a T-nut according to claim 10, characterized in that a height (H1) of a shorter baseline of a parallelogram formed by the retaining sections (23) is less than or equal to a width of a slot (8) and a height (H2) of a longer of the two baselines of the parallelogram formed by the retaining sections (23) is greater than the width of the slot (8). February 27, 2025 C 8 P 153 WO

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