DE102011050287A1 - Clamping screw for use in screw connection for wedge-fixing of e.g. solar cell module at roof, has screw head comprising closure unit for implementing frame surface during fixing screw for creating connection between frame and screw - Google Patents

Abstract

The screw has a screw head (2) provided with a drive (8) and a shaft (3) that is provided with an external thread (4) i.e. metric M8-thread, where ratio of screw head diameter (a2) to core diameter of the external thread is 4.5-6. The screw head comprises a closure unit (10) for implementing an electrically isolating frame surface at an underside (9) of the screw head during fixing the screw for creating an electrical conductive connection between a frame of a functional module and the screw, where the screw is made of electrically conductive material i.e. steel. The drive is designed as a hex driver or a Torx(RTM: T8 screw driver). An independent claim is also included for a screw connection.

Description

The invention relates to a clamping screw according to the preamble of claim 1 of an electrically conductive material for clamping fixing a frame having a functional module, in particular a solar cell module or a solar thermal module, to a support profile, comprising a screw head with drive and a shaft with external thread. Furthermore, the invention relates to a screw according to the preamble of claim 12, comprising a clamping screw, preferably a clamping screw according to the invention, and a carrier profile with extending in a longitudinal direction of the carrier profile groove for screwing the clamping screw perpendicular to the longitudinal extent of the groove, wherein the groove spaced two , Preferably parallel, groove walls, which are interconnected via a groove bottom.

From the WO 2009/090069 A1 is a clamping screw and a producible with such a clamping screw screw for clamping fixing solar cell modules on roofs known. The known clamping screw has a conical screw head, which is designed to cooperate with a clamping plate, which then defines the frame of the module by clamping on a carrier profile. The clamping screw thus acts indirectly clamped together with the frame profile of the module. In order to ground the frame modules, it is necessary to provide them with a corresponding grounding cabling, wherein it must be ensured that the grounding cabling is fixed to the frame profile such that its electrically insulating surface is interspersed. The known clamping screw cooperates with the already mentioned clamping profile in such a way that a screw connection can be produced between the carrier profile and the clamping screw. The screw is formed by the fact that the clamping screw when screwing into a groove of the carrier profile penetrates or durchschraubt a membrane, ie a continuous connection between two side walls of the groove, wherein the membrane according to the teaching of the document when inserting the screw makes a positive connection with the thread and moreover ensures that when screwing the screw, the two groove walls are fixed relative to each other to prevent expansion of the groove. A disadvantage of the known carrier profile is the comparatively high cost of materials and the relatively complex production, since the membrane must have a reduced thickness weakening area in a central region between the groove walls for facilitated screwing through.

Based on the aforementioned prior art, the present invention seeks to provide an alternative clamping screw through the use of a manufactured with this screw with less components and guarantees increased security against accidental loosening. In particular, the clamping screw should have at least one additional functionality in addition to the pure fixing effect. In addition, the object is to provide a simple to produce screw, comprising a carrier profile and a clamping screw to specify, with the screw should be characterized by a comparatively simple and inexpensive to produce carrier profile, which is also characterized by an optimized tensile strength with inserted clamping screw. More preferably, the function modules should be faster to install than before.

This object is achieved with respect to the clamping screw with the features of claim 1, in particular the fact that the screw head of the clamping screw on its underside means for passing through an electrically insulating frame surface of the functional module frame during fixing (screwing) the clamping screw for producing an electrically conductive connection between the frame and the clamping screw. The invention also relates to the combination of a clamping screw according to the invention, a function module clamped directly by the latter, and an initially generic carrier profile in which the clamping screw is fixed.

With regard to the screw connection, the object is achieved with the features of claim 12, in particular in that the groove has a free groove cross-section which is smaller than the distance between the groove walls and which is delimited at least on one longitudinal side of the groove from one in the direction of the longitudinal extent the groove extending and outside the groove bottom, d. H. at a distance from the groove bottom, or between the groove bottom and an outer groove opening profile section arranged under deformation during insertion of the clamping screw with the, preferably in the fixed state, the frame of a functional module with the screw head directly clamped, preferably, but not necessarily according to the invention, a clamping screw form-fitting and electrically conductive connection forms.

All combinations of at least two features disclosed in the description, the claims and / or the figures fall within the scope of the invention. In order to avoid repetition, features disclosed according to the device should be regarded as disclosed according to the method and be able to be claimed. Likewise, according to the method disclosed features should be considered as device disclosed and claimed claimable.

The invention is based on the idea to form the clamping screw for direct interaction, ie for immediate clamping of the functional module, more precisely the frame of the functional module, such that the clamping screw has a correspondingly enlarged screw head (in particular plate head), with which the clamping screw on the frame Support functional module to force the function module in the screwing of the clamping screw. At the same time, the clamping screw has on the, preferably annular, underside of the screw head means for damaging an electrically insulating frame surface (in particular an anodized layer) of the frame of the functional module. In other words, the screw head is provided on its underside with means that can penetrate an oxide layer, in particular an anodized layer of a light metal material, in particular an aluminum alloy material, when screwing the clamping screw, thus electrically electrically conductive screw directly to the electrically conductive material of the frame to connect below the aforementioned electrical insulating layer, wherein at the same time through the external thread and an electrically insulating outer layer, in particular an anodized layer, the carrier profile is interspersed with the carrier profile to produce an electrically conductive connection.

The clamping screw according to the invention is thus characterized by a combination of at least two features, namely on the one hand by the provision of a correspondingly large screw head for direct interaction with the frame and by means provided on this screw head means, which are in fixing (screwing) of the clamping screw in the Burst frame material of the functional module immediately and thereby produce an electrically conductive connection. Preferably, the thread (external thread) of the clamping screw is designed or adapted to a later to be explained, preferably used for carrier profile, that the external thread creates an electrically conductive connection to the carrier profile material, in order to ground the functional module on the carrier profile allow, without the need in addition to the at least one clamping screw to allow a further electrical connection to the frame profile of the functional module.

In a further development of the invention is advantageously provided that the means for producing an electrical connection are formed such that they form a positive engagement when screwing or by screwing the clamping screw in a carrier profile with the frame of the functional module, such that a displacement of the functional module is avoided perpendicular to the longitudinal extent of the clamping screw, for example, in the event that the clamping screw is not tightened sufficiently. In this case, then the clamping screw still serves as a securing or fixing, even if the clamping screw does not apply clamping force on the function module. In the case of clamping fixing the clamping screw designed as positive locking means increase the safety against unintentional loosening or moving the functional module.

Preferably, the module screw, in particular in a region between the screw head and external thread, a thread-free shaft portion which has a larger diameter than the external thread. The diameter of this section is preferably selected from a value range between 1.0 cm and 2.0 cm. At this thickened section function modules can be supported on two opposite sides, so that the module screw directly defines the distance between two adjacent function modules or acts directly as a spacer.

It is particularly expedient if the means are designed such that with these by screwing the screw, d. H. by twisting the screw about its longitudinal axis, an annular contoured recess in the frame of the functional module is formed. This can for example be achieved in that the means are annular. Most preferably, the means are rotationally symmetrical to the longitudinal axis of the clamping screw. By providing annular, in particular circumferentially closed, means, an optimal form-fit, which is as it were effective in all directions perpendicular to the longitudinal extent of the clamping screw, can be ensured or produced.

It is even more preferable if the means are designed to produce not only one but a plurality of preferably two annularly contoured depressions in the context of the functional module, wherein these depressions are preferably arranged concentrically. Preferably, the corresponding means for this purpose are arranged on different radii with respect to the longitudinal axis of the clamping screw.

It is particularly expedient if the means have a cutting edge, in particular a pointed or wedge-shaped tapered cutting edge, which is delimited or formed by two cutting edges arranged at a cutting angle relative to each other, preferably planar cutting edges, preferably in cross section at a cutting tip or ., Hit the cutting edge. It is particularly useful in this case, if it is a ring-shaped, preferably circumferentially closed edge acts. It is also conceivable to provide a plurality of cutting sections which are spaced apart in the circumferential direction, that is to say a blade which is not circumferentially closed, with a circumferentially closed blade being preferred for reasons of strength and for reasons of optimized positive locking.

It has been found that an optimum interlocking connection between the clamping screw, more precisely the means for producing an electrically conductive connection and the frame profile can be achieved if the cutting angle at which the cutting edges of the means are arranged from an angular range (Value range) is selected between about 5 ° and about 25 °, preferably between about 10 ° and about 20 °. Most preferably, the angle is about 15 °. This achieves an optimum compromise between strength or stability of the cutting edge on one side and notching or cutting action on the other side.

In particular, in order to realize the aforementioned, concentric Ringeinkerbungen in the context of the functional module to improve the positive connection and simultaneously the electrically conductive connection is provided in a further development of the invention advantageously that at least two, preferably only two, most preferably identically contoured cutting at different radii are provided. Even more preferably, each are annularly arranged or formed cutting edges, wherein the cutting edges are preferably arranged concentrically with respect to the longitudinal central axis of the screw.

It has proved to be particularly advantageous, in particular with regard to the cutting and clamping effect of the clamping screw, if the height extent of the means for producing an electrical connection and preferably for producing a connection oriented parallel to the longitudinal extent of the clamping screw, ie perpendicular to the surface extension of the screw head Formschlusses at least one-third, preferably at least half of the rectified height extent (thickness) of the screw head is. In a further development of the invention, it was therefore recognized that it is advantageous and completely sufficient to design the screw head, apart from the means, comparatively thin or to grant the means compared to the total thickness extension of the screw head a comparatively high thickness extension in order to increase the positive locking effect overall and to save material for the production of the clamping screw. At the same time, the danger of a shadow cast on the function module is reduced.

For the application of interest here for the fixation of functional modules, in particular on roofs or on other support structures, it has been found to be particularly advantageous if the screw head of the clamping screw has a diameter from a diameter range between about 25 mm and 50 mm. Most preferably, the diameter is selected from a value range between about 25 mm and 35 mm to ensure secure clamping of the module.

It is very particularly preferred if a ratio of the screw head diameter and a core diameter of the external thread is greater than 3.5, preferably greater than 4.0, very particularly preferably selected from a value range between 4.5 and 6.0.

The invention also leads to a screw connection, comprising a clamping screw and a carrier profile with a groove for screwing the clamping screw. It should be expressly pointed out that the screw can basically be realized with any type of clamping screw, so even with only indirectly interacting with the frame profile of the functional module screws, for example one in the WO 2009/090069 A1 shown clamping screw, which requires an additional clamping element for interacting with the functional module frame. It is of course particularly expedient to use the advantages of a clamping screw according to the invention cumulatively with the carrier profile according to the invention, if a clamping screw according to the invention designed as described above is used. The carrier profile with a generic clamping screw should be expressly disclosed as an independent invention.

The screw according to the invention is characterized by a specially designed carrier profile, in which the groove walls in departure of the teaching of WO 2009/090069 A1 are not connected to each other via a membrane which enters into a threaded connection with the clamping screw, but in which a connection between the groove walls is realized via a continuous groove bottom, which is expressly not durchschraubt with the clamping screw. The groove bottom thus does not serve for producing the screw connection, but essentially exclusively for fixing the groove walls to one another, in order to prevent impermissible widening of the groove walls. To produce a threaded connection between the clamping screw and the carrier profile, at least one, in particular strip-shaped, profile section is provided according to the invention, which extends transversely into the groove starting from at least one of the, in particular parallel, groove walls of the groove and thus the limited free groove cross-section. This profile section must not be penetrated due to the free groove cross-section when screwing the clamping screw and can thereby preferably have a greater thickness extension than the known membrane, thereby ensuring an improved threaded connection with increased tensile strength. Most preferably, the free groove cross section is limited on two opposite sides of at least one profile section. In other words, in a further development of the invention with advantage on each of the side walls at least one profile section, in particular from the groove bottom viewed at the same height, provided so that the clamping screw or the external thread of the clamping screw on both sides of the groove cross section, each with at least one profile section a threaded connection can go through appropriate molding. The profile sections are located on the downward side of the groove bottom and are at least partially spaced therefrom.

In a further development of the invention is provided with advantage that at least one groove wall, preferably on each groove wall, a plurality of spaced apart and superimposed, in particular identically contoured even more preferably in cross-section rectangular profile sections are provided in different height ranges of the groove depth between the carrier profile and clamping screw by molding the external thread of the clamping screw when screwing the clamping screw to make a threaded connection can.

The free groove cross-section delimited by at least one profile section is preferably wider than the sum of the width extension of the profile sections delimiting the free groove cross-section in one plane.

It is particularly expedient if the carrier profile has (at least) two grooves which are each delimited by two groove walls, wherein in each groove at least one previously described profile section is provided for delimiting the free groove cross-section. Most preferably, the at least two grooves and / or the respective associated profile sections are contoured equal. Most preferably, each groove in the same arrangement and extension and number profile sections are provided. A particularly good strength of the carrier profile can be achieved if the two grooves or the grooves bounding portions, in particular the bottom portions and / or the side walls of the two grooves, are interconnected.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings.

These show in:

1a : a view of a preferred embodiment of a clamping screw according to the invention of electrically conductive material, here steel, from below,

1b a sectional view of the clamping screw according to 1a along the section line AA,

1c : an enlarged detail Z out 1b .

1d : an enlarged detail view of a detail Y out 1b .

1e : a plan view of the head of the clamping screw,

2 : a carrier profile made of a light metal alloy, in particular an aluminum alloy, for producing a screw connection with a clamping screw, in particular one example in the 1a to 1e shown clamping screw and

3 a threaded connection comprising a clamping screw and a carrier profile.

In the figures, like elements and elements having the same function are denoted by the same reference numerals.

In the 1a to 1e is in various views and detailed views a preferred embodiment of a clamping screw 1 for producing a functional module a clamping fixing screw connection shown. The clamping screw 1 includes a screw head 2 , which is perpendicular to the longitudinal extent of an axially adjoining the screw head shaft 3 extends. The shaft 3 is about threadless in the upper quarter and thickened and thus designed as a spacer for functional modules and starting from the lower end of this upper portion in the direction of the free end with an external thread 4 provided for producing a fixing and electrically conductive connection with a in the 2 and 3 exemplified carrier profile. In the embodiment shown, it is the external thread 4 around a metric M8 thread. Preferably, a displacement thread is used alternatively. The length extension 5 of the male threaded portion is 40 mm in the illustrated embodiment. The length extension 6 , starting from a free end of the shaft 3 up to an extended shaft section is 53.5 mm. The extended shaft section 7 has an outer diameter a1 of 12 mm. At the extended shaft portion 7 closes the screw head 2 at. The screw head 2 has a diameter a2 of 32 mm.

Out 1b it can be seen that in the screw head 2 centric a drive designed as an Allen drive (alternatively eg Torx drive) 8th for fixing (screwing in) the clamping screw 1 is provided.

On an annular base 9 of the screw head 2 are means 10 for damaging an electrically insulating frame surface of the frame of the functional module when screwing the clamping screw for establishing an electrically conductive connection between the frame and the clamping screw 1 intended. In the embodiment shown, the means comprise 10 two annular, circumferentially closed concentrically arranged cutting edges 11 . 12 that enlarges in 1c are shown. The cutting 11 . 12 are located at different radii with respect to the longitudinal axis of the clamping screw and are arranged concentrically to this. Every cutting edge 11 . 12 has two flat cutting edges 11a . 11b respectively. 12a . 12b on, with each pair of cutting edges 11a . 11b ; 12a . 12b includes a cutting angle α of 15 ° in the embodiment shown. The cutting edges 11a . 11b ; 12a . 12b each cutting edge pair, ie each cutting edge 11 . 12 , meet at a pointed, annular edge (cutting edge) 11c ; 12c , A diameter a3 of one of the inner cutting edge 11c defined circle is in the embodiment shown 24 mm, whereas the diameter a4 one of the second, outer cutting edge 12c defined or formed circle is 30 mm. The total length extension 13 the clamping screw 1 is 60 mm. The distance 14 between the free end of the clamping screw 1 and a flat, flat bearing surface 15 of the screw head 2 is 58.5 mm. As it turned out 1c results, the height extension is 16 both identically contoured cutting 11 . 12 two millimeters. This is the height extension 16 the means 10 more than half of the total height of the screw head totaling 3.5 mm. In 1d is a transition region between the lower (reduced diameter) shaft portion of the shaft 3 and the extended shaft portion 7 to recognize. Viewed from bottom to top, a concave radius region R2 transitions into a narrower, convex radius region R1.

Out 1c is a particularly advantageous embodiment to recognize, according to which an upper side 17 of the screw head 2 beveled in the edge region and that at an angle β in the illustrated embodiment 30 ° with respect to a radial plane to the parallel to the contact surface 15 is trained. The radial extension 18 of the tapered portion is 1 mm in the embodiment shown. Out 1e it can be seen that the wrench size 19 designed as Allen drive drive 8th in the embodiment shown is 5 mm.

In 2 is a preferred embodiment of a carrier profile 20 shown, which is designed substantially as a cross-sectionally square profile and is designed to cooperate with a clamping screw in order to fix a non-illustrated functional module, in particular a solar cell module or a solar thermal module, by clamping. For receiving the clamping screw, the carrier profile 20 two, substantially rectangular in cross-section contoured grooves 21 . 22 on, the side of each of two groove walls 21a , b; 22a , b are limited. The respective groove walls 21a . 21b respectively. 22a . 22b are over a groove bottom 21c respectively. 22c in an inner region of the carrier profile 20 interconnected, wherein in the embodiment shown to increase the strength of the overall beam profile, the mutually facing groove walls 21b and 22a are integrally formed or connected to each other. The two grooves 21 . 22 are located on two mutually perpendicular side surfaces of the carrier profile 20 ,

In every groove 21 . 22 In the embodiment shown, two pairs of profile sections 21d . 21e and 21f . 21g respectively. 22d . 22e and 22f . 22g intended. The respective pairs of profile sections are in the vertical direction of the groove 21 respectively. 22 spaced apart and are located outside, that is offset outwards relative to the respective groove bottom 21c . 22c ,

Each pair of profile sections 21d . 21e ; 21f . 21g ; 22d . 22e ; 22f . 22g each limit a free groove cross-section for receiving a clamping screw, not shown. In the exemplary embodiment shown, all profile sections are identically contoured, in this case rectangular, and extend along the longitudinal extent of the respective groove 21 . 22 ,

It can be seen that the sum of the widthwise extension of the profile sections of each profile section pair (preferably at least one profile section pair) oriented transversely to the uphill direction is less than the width or extension of the free groove section defined by these sections.

As in the following 3 will be explained, serve the profile sections or the profile section pairs for producing a threaded connection with the external thread of the clamping screw by the clamping screw during Screwing into the profile sections einformt, for example, cuts, or by material is displaced to thereby increase the contact surface between the external thread of the clamping screw and the carrier profile yet.

In 3 is in the groove 21 a highly schematic illustrated clamping screw 1 added. It is preferably a clamping screw in the manner in which 1a to 1e shown. The clamping screw 1 includes a shaft 3 with external thread 4 , which a positive threaded connection with the profile sections 21d until g is received. The shaft 3 the clamping screw 1 ends before the groove bottom 22c , With her screw head 2 clamps the clamping screw 1 a frame 23 from a light metal alloy of a functional module designed here as a solar cell module, not shown in detail. Here are the trained as cutting, concentrically arranged means 10 in the frame material of the frame 23 in such a way that a very thin, electrically insulating oxide layer is penetrated and thus an electrically conductive connection between the frame material and the formed of an electrically conductive material clamping screw 1 and the carrier profile is made. By the intervention arise in the frame 23 two notches triangular in cross-section 25 . 26 (Depressions), which are based on different radii with respect to the longitudinal center axis of the clamping screw 1 are located. The means 10 at the same time serve as positive locking means, as these the clamping screw 1 positively connect with the frame module to move the frame 23 perpendicular to the longitudinal extent of the clamping screw 1 safe to prevent.

Out 3 is also the spacer function of the clamping screw 1 to recognize. The functional module is located directly on the thickened, thread-free shank portion, wherein on the side facing away from this another functional module on the clamping screw 1 may be provided adjacent.

How out 3 can be seen, was at or by screwing the clamping screw 1 Material of the profile sections 21d displaced until g and between the profile sections 21d to g and the external thread 4 the clamping screw 1 made a threaded connection, wherein the axial extent of the threaded connection is greater than the axial extent of the original, ie not yet deformed profile sections 21d to g, as exemplified in 2 are shown.

LIST OF REFERENCE NUMBERS

1

clamping screw

2

screw head

3

shaft

4

external thread

5

longitudinal extension

6

longitudinal extension

7

extended shaft section

8th

drive

9

bottom

10

medium

11

cutting edge

12

cutting edge

11a

cutting edge

11b

cutting edge

11c

cutting edge

12a

cutting edge

12b

cutting edge

12c

cutting edge

13

length

14

distance

15

contact surface

16

height extension

17

top

18

radial extension

19

Key-width

20

carrier profile

21

groove

22

groove

21a

groove wall

21b

groove wall

21c

groove bottom

21d

profile section

21e

profile section

21f

profile section

21g

profile section

22a

groove wall

22b

groove wall

22c

groove bottom

22d

profile section

22e

profile section

22f

profile section

22g

profile section

23

frame

24

function module

25

Indentation (recess)

26

Indentation (recess)

a1

outer diameter

a2

outer diameter

a3

diameter

a4

diameter

α

cutting angle

β

chamfer

R1

convex radius range

R2

concave radius range

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2009/090069 A1 [0002, 0019, 0020]

Claims (15)

Clamping screw ( 1 ) of an electrically conductive material for clamping fixing a frame ( 23 ) functional module ( 24 ), in particular a solar cell module or a solar thermal module, on a carrier profile ( 20 ) comprising a screw head ( 2 ) with drive ( 8th ) and a shaft ( 3 ) with external thread ( 4 ), characterized in that the screw head ( 2 ) on its underside ( 9 ) Medium ( 10 ) for penetrating an electrically insulating frame surface when fixing the screw ( 1 ) for making an electrically conductive connection between the frame ( 23 ) and the screw ( 1 ) having. Clamping screw ( 1 ) according to claim 1, characterized in that the means ( 10 ) are formed as a positive locking means in order to fix the clamping screw ( 1 ) dig into the frame material and thereby a move the function module ( 24 ) perpendicular to the longitudinal extent of the clamping screw preventing positive engagement with the frame ( 23 ) to build. Clamping screw ( 1 ) according to one of claims 1 or 2, characterized in that the means ( 10 ) are formed in order to fix the screw ( 1 ) an annular contoured depression ( 25 . 26 ) in the framework ( 23 ) of the functional module ( 24 ) to create. Clamping screw ( 1 ) according to one of the preceding claims, characterized in that the means ( 10 ) are formed to at least two concentric, respectively annular contoured depressions ( 25 . 26 ) in the framework ( 23 ) of the functional module ( 24 ) to create. Clamping screw ( 1 ) according to one of the preceding claims, characterized in that the means ( 10 ), in particular in cross-section wedge-shaped, cutting edge ( 11 . 12 ) with two cutting edges (α) arranged at a cutting angle ( 11a . 11b ; 12a . 12b ). Clamping screw ( 1 ) according to claim 5, characterized in that the, preferably circumferentially closed, cutting edge ( 11 . 12 ) Is annular, preferably annular. Clamping screw ( 1 ) according to one of claims 5 or 6, characterized in that the cutting angle (α) is selected from a value range between 5 ° and 25 °, preferably between 10 ° and 20 °, or preferably 15 °. Clamping screw ( 1 ) according to one of claims 5 to 7, characterized in that at least two, preferably identically contoured, preferably annular, cutting ( 11 . 12 ) are arranged at different radii, particularly preferably concentrically. Clamping screw ( 1 ) according to one of the preceding claims, characterized in that parallel to the longitudinal extent ( 13 ) of the clamping screw ( 1 ) oriented height extension ( 16 ) of funds ( 10 ) at least one third, preferably at least half of the height extent of the screw head ( 2 ) is. Clamping screw ( 1 ) according to one of the preceding claims, characterized in that the screw head ( 2 ) laterally adjacent to the means ( 10 ) arranged in a radial plane flat bearing surface ( 15 ) having. Clamping screw ( 1 ) according to one of the preceding claims, characterized in that a ratio of screw head diameter and core diameter of the external thread ( 4 ) is greater than 3.5, preferably greater than 4.0, most preferably selected from a range between 4.5 and 6.0. Screw connection, comprising a clamping screw ( 1 ), in particular according to one of the preceding claims, and a carrier profile ( 20 ) with a groove ( 21 . 22 ) for screwing in the clamping screw ( 1 ) perpendicular to the longitudinal extent of the groove ( 21 . 22 ), wherein the groove ( 21 . 22 ) two spaced, preferably parallel, groove walls ( 21a . 21b ; 22a . 22b ), which via a groove bottom ( 21c . 22c ), characterized in that the groove ( 21 . 22 ) has a free groove cross section which is smaller than the distance of the groove walls ( 21a . 21b ; 22a . 22b ) and at least on one longitudinal side of the groove ( 21 . 22 ) is limited by a in the direction of the longitudinal extent of the groove ( 21 . 22 ) and outside the groove bottom ( 21c . 22c ) arranged profile section ( 21d to 21g ; 22d to 22g ), which under deformation during insertion of the screw ( 1 ) with the screw ( 1 ) forms a positive and electrically conductive connection. Screw connection according to claim 12, characterized in that the free groove cross-section is limited by a pair of profile sections, comprising two mutually opposite at different groove walls ( 21a . 21b ; 22a . 22b ) arranged profile sections ( 21d to 21g ; 22d to 22g ). Screw connection according to one of claims 12 or 13, characterized in that on at least one of the groove walls ( 21c . 22c ), preferably on both groove walls ( 21c . 22c ), in each case a plurality of superimposed and spaced profile sections ( 21d to 21g ; 22d to 22g ) to the positive connection with the clamping screw ( 1 ) are provided. Screw connection according to one of claims 12 to 14, characterized in that at least two mutually perpendicular carrier profile sides each at least one groove ( 21 . 22 ) each having at least one profile section ( 21d to 21g ; 22d to 22g ) is provided, wherein preferably the groove bottoms ( 21c . 22c ) or the groove walls ( 21a . 21b ; 22a . 22b ) of the grooves ( 21 . 22 ) are interconnected.

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