Abstract:
A profile bar ( 10, 10   a ) formed as an extruded part and consisting of a light metal alloy, in particular an aluminum alloy, with a rectangular in particular square, cross-section, wherein a longitudinal groove pair ( 20, 20   a ), comprising two longitudinal grooves arranged parallel to one another and at a distance from one another, is provided in each case on at least one lateral surface, preferably on all four lateral surfaces, and with at least two, preferably four, longitudinal channels which extend parallel to the longitudinal grooves and which form in each case an opening ( 40 ) for fastening in each case a pen ( 34 ) on each of the two end faces ( 36 ) of the profile bar ( 10, 10   a ), wherein each longitudinal channel is arranged on an imaginary intersection line of planes extending at a right angle to one another and arranged perpendicularly to in each case a lateral surface, wherein at least one of the planes is a longitudinal center plane of a longitudinal groove of a longitudinal groove pair ( 20 ).

Description:
BACKGROUND OF THE INVENTION 
     The invention relates to a profile bar, a system with at least one such profile bar, and a profile assembly, comprising two profile bars, as well as a method for producing such a profile assembly. 
     Profile bars, in particular aluminium profile bars are generally known and serve for the production or respectively forming of supporting structures which are a component part, for example, of machinery or suchlike. Here, usually a plurality of profile bars are used, which are connected rigidly with one another to form a frame, wherein the most varied of connecting elements are known for connecting profile bars with one another at right angles, which connecting elements usually brace two adjacent profile bars with respect to one another. For this purpose, the connecting elements as a rule engage into at least one undercut longitudinal groove of a first profile and into a further undercut longitudinal groove of a second profile or alternatively into a longitudinal channel, in particular a central channel of the second profile, with which the connecting element is fastened for example by screwing. The engagement into an undercut longitudinal groove frequently takes place by means of a so-called sliding block. 
     If a first profile bar is now fastened with an end face, for example by means of a sliding block and a clamping screw cooperating therewith, against a lateral surface of a second profile bar, the problem arises that a tensile force is exerted onto the sliding block via the first profile bar lying with its end face against the lateral surface of the second profile bar on introduction of a force running perpendicularly to the longitudinal axis of the first profile bar. This tensile force, in connection with the relatively small end surface of the first profile bar, brings about the risk of the bending open of the undercut longitudinal groove of the second profile bar, so that the sliding block is no longer held securely. The risk therefore exists that the first profile bar detaches itself from the second profile bar. Furthermore, the problem exists that the first profile bar, on introduction of a torque perpendicularly to its longitudinal axis can be twisted about its longitudinal axis to the second profile bar, which makes difficult a positionally or respectively angularly correct mounting of the profile bars with respect to one another, and in the finished profile assembly requires, if necessary, additional components for security against twisting. 
     Connecting elements for connecting profile bars with one another are known for example from DE 20 2007 002 604 U1 and DE 299 10 404 U1 The known connecting elements are suitable for connecting profile bars with one another in longitudinal direction or perpendicularly, wherein with the known connecting elements likewise tensile forces are generated via the elements which are arranged in the undercut longitudinal grooves, which tensile forces, as explained above, can expand the longitudinal groove receiving them. 
     A typical profile bar which is widely used in practice is described in DE 197 5 70 89 C1. This known profile bar is contoured in a square shape and has centrally on each side an undercut longitudinal groove for fastening a further profile bar, as is described extensively in the publication. In the known profile bar, the explained risk of bending open of the undercut longitudinal groove likewise exists. 
     From U.S. Pat. No. 5,921,052 an alternative profile bar is known, which in addition to each undercut longitudinal groove has two non-undercut auxiliary grooves with a rectangular cross-sectional area, receiving the undercut longitudinal groove between them, which auxiliary grooves serve for fastening further components, in which these engage into the additional grooves in a form-fitting manner. 
     From DE 92 10 639, furthermore, an alternative profile bar is known, which has longitudinal channels running parallel to a central channel and sitting on the corners of an imaginary square. These additional longitudinal channels serve to be provided in their respective end-face end section with a thread, in order to be able to screw herein connecting elements for the bracing of two profile bars with one another. The aim is to be able to use the central bore as a compressed air duct. 
     The described profile bars serve, as mentioned, in particular for production for frames in machine construction or other supporting structures. It is also usual to arrange on a corresponding profile bar structure a door element on a vertically running profile bar, in which in the associated undercut longitudinal groove of the profile bar corresponding connecting elements are fastened, via which tensile forces are exerted perpendicularly to the longitudinal extent of the profile bar, which can likewise lead to an expanding of the undercut longitudinal groove, so that in particular in the case of additional external applications of force onto the door element the risk exists that the connecting element is pulled out from the undercut groove of the profile bar. 
     In the knowledge of the above-mentioned prior art, the problem consists of indicating an improved, alternative profile bar which is suitable for realizing in a simple manner a securing against twisting in a profile assembly. 
     In addition, the profile bar is preferably to be suitable for being able to receive tensile forces introduced for example via a sliding block or another anchoring element into an undercut longitudinal groove, without the risk of deformation or respectively expanding of the longitudinal groove. 
     Furthermore, the problem consists of indicating a system by which, with the use of a profile bar according to the invention, a security against twisting is provided and, if applicable, an expanding of an undercut longitudinal groove is reliably prevented. Moreover, the problem consists in indicating a profile assembly which is improved accordingly, and a method for producing such a profile assembly. 
     SUMMARY OF THE INVENTION 
     To avoid repetitions, features disclosed with regard to the device are to be deemed as disclosed with regard to the method. Likewise, features disclosed with regard to the method are to be deemed as disclosed with regard to the device. 
     The central idea of the invention is to provide, in a profile bar, longitudinal channels running parallel to longitudinal grooves, such that on the end face pins projecting over the end face are able to be introduced into openings formed by the longitudinal channels, such that the pins can engage into the longitudinal grooves of an identically constructed further profile bar arranged at right angles to the profile bar, in order to hereby secure the two profile bars against twisting with respect to one another. 
     For this, at least two pins must be provided in the one profile bar, wherein the pins engage into different longitudinal grooves, running parallel to one another, of a longitudinal groove pair of the further profile bar. 
     For the case where the longitudinal grooves of the longitudinal groove pair are constructed as undercut longitudinal grooves, the measure described above serves primarily for security against twisting. In an alternative embodiment of the profile bar, in which in addition to the longitudinal groove pair for the pins an undercut longitudinal groove is provided between the longitudinal grooves of the longitudinal groove pair, the above measure serves not only for security against twisting, but also serves to prevent an expanding of the undercut longitudinal groove received between the longitudinal grooves of the longitudinal groove pair, when, for example via a sliding block or other connecting or anchoring element, a tensile force is exerted onto the undercut, which is not only advantageous when two profile bars are arranged at right angles to one another and are under tension with respect to one another, but also brings advantages with regard to a prevention of an expanding of the longitudinal groove for the case when in the undercut longitudinal groove a fastening element for a door, in particular a hinge element, is fastened, wherein the hinge element is fastened via an anchoring element in the undercut longitudinal groove. 
     Furthermore, the longitudinal grooves of a longitudinal groove pair of a further, primarily right-angled positioning of two profile bars can serve to simplify mounting when two profile bars are fastened to one another with an angle element which engages via corresponding extensions into the longitudinal grooves of the longitudinal groove pairs of the profile bars which are arranged at right angles to one another. At the same time, via such angle elements, for the case of the provision of an undercut longitudinal groove in addition to the longitudinal grooves of a longitudinal groove pair an expansion of the undercut longitudinal groove can be prevented. 
     In the simplest case, the profile bar has a longitudinal groove pair on only one lateral surface, with two parallel longitudinal grooves to respectively receive a pin received in an end-face opening of a further profile bar. In this case, the longitudinal channels are arranged respectively on an imaginary intersection line of a longitudinal centre plane of a longitudinal groove of the longitudinal groove pair and a further plane, which runs orthogonally to a lateral surface which runs at right angles to the lateral surface which has the longitudinal groove pair. For the preferred case that a longitudinal groove pair is provided respectively on at least two lateral surfaces running at right angles to one another, the longitudinal channels lie on respectively an intersection line of two longitudinal centre planes of two longitudinal grooves, which are situated on lateral surfaces running by 90° to one another. Independently of the practical embodiment, it is preferred if the respective intersection line forms a longitudinal centre axis of the associated longitudinal channel. 
     In addition to the embodiments described above, according to which two longitudinal grooves are provided on only one lateral surface or respectively two longitudinal grooves are provided on two lateral surfaces running at right angles to one another, an embodiment is also possible in which a longitudinal groove pair are provided respectively on three lateral surfaces to receive pins arranged in the longitudinal channels of a further profile bar. It is also possible and particularly preferred to provide a longitudinal groove pair respectively on all four lateral surfaces, wherein the longitudinal channels are then arranged respectively on intersection lines of two longitudinal centre planes of two longitudinal grooves of different longitudinal groove pairs, which are situated on lateral surfaces offset by 90° to one another. 
     It is most particularly preferred if the at least two openings, formed from two longitudinal channels, of an end face are arranged diametrically opposite in relation to a longitudinal centre axis of the profile. Preferably, the openings lie on a plane of symmetry of the profile bar, which runs at a 45° angle to two lateral surfaces. For the case of the provision of four openings per end face, wherein each opening is formed by respectively a longitudinal channel, it is preferred if the openings are arranged lying on the corners of an imaginary square. The provision of four openings or respectively four longitudinal channels is particularly preferred for an embodiment of the profile bar in which the profile bar has respectively a longitudinal groove pair, to receive pins arranged in openings of a further profile bar, on at least two lateral surfaces arranged at right angles to one another. 
     As already indicated in the introduction, different possibilities exist with regard to the configuration of the longitudinal grooves of the longitudinal groove pairs or of the at least one longitudinal groove pair. In particular in the case of larger profile bars, it is preferred if the longitudinal grooves of a longitudinal groove pair are constructed to receive pins as undercut longitudinal grooves, in which typically sliding blocks can be received. In such profile bars, the pins serve primarily for security against twisting. 
     In an alternative embodiment, in addition to at least one longitudinal groove pair on one lateral surface an undercut longitudinal groove is provided, which runs centrally between the longitudinal grooves of the longitudinal groove pair to receive pins, in order to prevent a bending open of the longitudinal groove on the application of tensile force perpendicularly to the surface extent of the lateral surface, and in order simultaneously to provide a security against twisting for an assembly of two profile bars running at right angles to one another and lying against one another. 
     In particular for the embodiment of the profile bar with an undercut longitudinal groove received centrally between the longitudinal grooves of a longitudinal groove pair, it is preferred if the longitudinal grooves of the longitudinal groove pair have a rectangular cross-section, or alternatively also are configured as undercut longitudinal grooves, in particular to receive double swallowtail-shaped connectors for connecting with one another two parallel profile bars lying against one another. 
     An embodiment of the profile bar is particularly expedient, in which the latter has a central channel which is preferably, but not compulsorily, contoured in a circular shape, in particular to receive an anchor screw. If required, the central channel can be provided with an internal thread. 
     It is particularly expedient if an imaginary connecting line, arranged between two diametrically opposed longitudinal channels, intersects the above-mentioned central channel centrally. The connecting line is preferably a symmetry line which runs to two adjacent lateral surfaces in a 45° angle. 
     In order to enable a simple mounting and in order to ensure a simple structural installation, it has been found to be particularly preferred if the diameter of the openings formed by the longitudinal channels on the end faces corresponds to a groove width of the longitudinal grooves. Preferably, the diameter corresponds to a minimum groove width for the case where the longitudinal grooves are configured as undercut grooves. 
     The invention also specifies a system, comprising at least one profile bar constructed according to the concept of the invention, wherein a pin projects from at least two of the openings provided on an end face and formed by respectively a longitudinal channel, which pin protrudes over the end face such that the at least two pins can be received in different longitudinal grooves of a longitudinal groove pair. Different possibilities exist with regard to the embodiment of the pins or respectively the manner of fastening the pins (extensions). 
     It is possible to construct the pins as externally threaded pins which can be screwed with an external thread into an internal thread which is then provided in the longitudinal channels, or which pins have a self-cutting thread, in order to produce a corresponding internal thread in the associated longitudinal channel by cutting or by shaping. An embodiment is particularly expedient, in which the pins are constructed as so-called notched- or dowel pins, which are held in a gripping manner in the longitudinal channels, in particular by realizing a press fit. For this, the diameter of the pin corresponds at least approximately to the internal diameter of the associated longitudinal channel. It is particularly expedient if in addition the diameter of the pins corresponds at least approximately to a groove width of the associated longitudinal groove, in particular a minimum longitudinal groove width. 
     The system preferably also comprises a connecting element for connecting two profile bars according to the invention. It is particularly expedient here if the connecting element has two support sections arranged at right angles to one another, in which preferably respectively a through-opening is provided for a connecting element at least indirectly cooperating with an undercut longitudinal groove of the profile bar, and that on the side of the connecting element facing the respective profile bar at least one extension is constructed, which cooperates with a longitudinal groove of a longitudinal groove pair or respectively projects therein perpendicularly to its longitudinal extent and which aligns the connecting element hereby to the profile bar. Hereby, the connecting element can be positioned particularly simply to the profile bars or respectively can be brought in connection therewith, wherein the profile bars and the connecting element are aligned to one another via the extensions and the longitudinal grooves of longitudinal groove pairs. 
     A particularly secure and robust positioning of the profile bars by means of the previously outlined connecting element can be achieved if two extensions, spaced apart from one another in longitudinal direction of the longitudinal grooves, are associated with both longitudinal grooves of a longitudinal groove pair of each profile bar. 
     In a structurally preferred configuration of the connecting element, provision is made that the two support sections are constructed on plate-shaped support elements, and that the support elements are connected at their end faces by means of reinforcing plates arranged perpendicularly to the plane of the support elements. Thereby, the bending moments which are introduced via a first profile bar are transferred particularly well from the connecting element to the second profile bar. 
     In a most particularly preferred embodiment of the production of the connecting element, it is proposed that the connecting element is constructed as an aluminium pressure die casting or as a cold extruded part. 
     The invention also specifies a profile assembly, comprising a first and a second profile bar, wherein these profile bars are constructed respectively according to the concept of the invention. The first and the second profile bar are arranged at right angles to one another within the profile assembly, such that the first profile bar rests with an end face on a lateral surface of the second profile bar, wherein a pin, in particular a notched or dowel pin, is fastened in at least end-face two openings of the first profile bar, formed by respectively a longitudinal channel, which pin engages into a longitudinal groove of a longitudinal groove pair of the second profile bar. It is particularly expedient here if in addition a connecting element is provided, by which the two profile bars are under tension with respect to one another. It is still further preferred, if the profile bars are profile bars which in addition to a longitudinal groove pair to receive the connecting element have an undercut longitudinal groove arranged between the longitudinal grooves of the longitudinal groove pair, the expanding of which longitudinal groove is prevented by the engaging of the first profile bar with the end-face pins in longitudinal grooves of the longitudinal groove pair of the second profile bar. 
     The invention also specifies a method for producing a profile assembly configured by the concept of the invention, wherein for this two profile bars are provided or respectively used which are configured according to the concept of the invention. 
     The first profile bar is provided on the end face with at least two pins which are introduced into openings which are formed by respectively a longitudinal channel, wherein the two profile bars are aligned to one another so that the pins engage into the longitudinal grooves of a longitudinal groove pair of the second profile bar. Preferably, the two profile bars are additionally under tension with respect to one another via connecting element, wherein the connecting element, depending on the configuration, engages in particular by means of a sliding block into at least one undercut longitudinal groove of one of the profile bars and/or is fastened into a longitudinal channel of one of the profile bars or into a longitudinal groove in the direction of its longitudinal extent, in particular by screwing. A profile assembly constructed according to the concept of the invention can be mounted particularly simply, and the profile bars can be positioned or respectively aligned with respect to one another particularly simply. 
     Furthermore, torques or forces introduced via a profile bar are received particularly well by the other profile bar, without the latter being deformed or damaged. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further advantages, features and details of the invention will emerge from the following description of preferred example embodiments and with the aid of the drawings. 
       These show in: 
         FIG. 1  a profile bar according to concept of the invention, 
         FIG. 2  a cross-sectional view of the profile bar according to  FIG. 1 , 
         FIG. 3  a top view onto the profile bar according to  FIG. 1 , 
         FIG. 4  and  FIG. 5  respectively a connecting element for connecting two profile bars in different perspective illustrations, 
         FIG. 6  a profile assembly consisting of two profile bars and a connecting element, in side view, wherein of course alternative connecting elements could be provided, in particular those which tension the two profile bars with respect to one another, 
         FIG. 7  a view onto the profile assembly according to  FIG. 6  in the direction of the arrow VII of  FIG. 6 , 
         FIG. 8  a view according to the profile assembly in the direction of the arrow VIII of  FIG. 6 , 
         FIG. 9  a perspective view of the profile bar according to  FIG. 1  with pins projecting on the end face from openings formed by longitudinal channels, 
         FIG. 10  a profile assembly modified with respect to  FIG. 7 , 
         FIG. 11  a cross-section through profile bars connected with one another at their lateral surfaces, 
         FIG. 12  an end face view of an alternative profile bar, and 
         FIG. 13  a top view onto a lateral surface of a profile bar according to  FIG. 12 . 
     
    
    
     DETAILED DESCRIPTION 
     Identical components or respectively components with identical function are provided with identical reference numbers in the figures. 
     In  FIGS. 1 to 3  a profile bar  10  configured according to the invention is illustrated. The profile bar  10  consists at least substantially of aluminium, preferably of AlMgSil, and is produced by impact extrusion. As can be seen in particular with the aid of  FIG. 2 , the profile bar  10  has a substantially square cross-sectional shape with four identically constructed lateral surfaces. In a core region of the profile bar  10  a central channel  11  is formed which is continuous in longitudinal direction. The profile bar  10  has two planes of symmetry  12 ,  13  arranged at right angles to one another, which intersect centrally in the central channel  11 . In each of the lateral surfaces of the profile bar  10  a continuous, undercut longitudinal groove  15 , running in longitudinal direction of the profile bar  10 , is formed centrally to the respective plane of symmetry  12 ,  13 . The undercut longitudinal groove  15  serves, in a manner which is known and is therefore not explained in further detail, to receive for example sliding blocks or suchlike, wherein a threaded bore is formed in the sliding block, which threaded bore cooperates with a fastening screw, which is likewise not illustrated. By means of such a sliding block and the fastening screw, for example add-on pieces can be fastened to a profile bar  10 . On the side of the undercut longitudinal groove  15  facing the respective lateral surface of the profile bar  10  in addition a step-shaped shoulder  16  is respectively formed. 
     Two continuous longitudinal grooves  17 ,  18  running in longitudinal direction of the profile bar  10  are formed symmetrically to the planes of symmetry  12 ,  13  in each of the lateral surfaces of the profile bar  10 . The longitudinal grooves  17 ,  18  form together a longitudinal groove pair and, in the first example embodiment, have a respectively rectangular, in particular a square, cross-section. Here, the distance a of the longitudinal grooves  17 ,  18  of the longitudinal groove pair to the respective lateral surface of the profile bar  10  and to the shoulder  16  of the undercut longitudinal groove  15  is configured for example of equal size. 
     For example, the profile bar  10  has an edge length of respectively 40 mm. The distance a is 5 mm and the groove width b of the additional longitudinal grooves  17 ,  18  is respectively 4 mm with a groove depth of 3 mm. 
     Furthermore, provision is made that spaced apart from the groove base  19  of the respective longitudinal groove  17 ,  18  of the longitudinal groove pair  20 , a longitudinal channel  21 , running in longitudinal direction of the profile bar  10 , is formed with a diameter d, wherein the diameter d is adapted to the groove width b of the additional longitudinal groove  17 ,  18 . Here, the additional longitudinal channel  21  is aligned to the additional longitudinal grooves  17 ,  18  such that the additional longitudinal channel  21  runs parallel to the respective longitudinal groove  17 ,  18 , wherein a connecting line  22  arranged between two diametrically opposed longitudinal channels  21  intersects the central channel  11  centrally. As can be seen unequivocally from  FIGS. 1 and 2 , the—in the example embodiment shown—four longitudinal channels  21  form on the end face respectively an opening  40 , wherein the openings  40  in the example embodiment shown are penetrated centrally by the associated intersection line, on which the associated longitudinal channel  21  lies. 
     Alternative fastening concepts are also able to be realized. As a rule, these have in common the fact that a connecting element coming into use tensions both profile bars with respect to one another. The longitudinal channels  21  are respectively arranged on an intersection line  25  of two planes arranged at right angles to one another, wherein in the shown example embodiment these planes are formed as central planes of two longitudinal grooves of longitudinal groove pairs offset by 90° to one another, so that a pin (not illustrated) received in the longitudinal channels  21  can engage into an associated longitudinal groove of an identical profile bar, when the two profile bars are arranged at right angles to one another, such that the profile bar having the pins rests with its end face  36  on a lateral surface  37  of the other profile bar. 
     Each of the longitudinal channels  21  lies on an intersection line  35  of two longitudinal centre planes  36 ,  37 , which are drawn in  FIG. 2  for clarification. The intersection lines  35  form the respectively longitudinal central axes of the associated longitudinal channels  21 . As can be seen from  FIG. 2 , the longitudinal centre planes  36 ,  37  intersecting in the intersection line  35  belong to two longitudinal grooves of different longitudinal groove pairs. These longitudinal groove pairs are situated on two lateral surfaces of the profile bar arranged at right angles to one another. Through the arrangement of the longitudinal channels  21  on these intersection lines  35  it is ensured that a pin introduced into an opening  40  formed on the end face by a longitudinal channel  21  can be inserted into a longitudinal groove of an identical profile bar running at right angles. In an alternative example embodiment, which is not illustrated, in which for example a longitudinal groove pair  22  for receiving pins is provided only on one of the lateral surfaces  37 , a corresponding intersection line is likewise as formed by two planes arranged perpendicularly to one another, wherein one of the planes is formed by a longitudinal centre plane of a longitudinal groove of the longitudinal groove pair, and the further plane is a plane which stands perpendicularly on a lateral surface, which runs at right angles to the lateral surface which has the longitudinal groove pair. 
     An embodiment is basically preferred according to which at least two longitudinal channels lie on respectively an intersection line which is formed respectively by two longitudinal centre planes, intersecting one another in the intersection line, of two longitudinal grooves of different longitudinal groove pairs, which are situated on two lateral surfaces arranged at right angles to one another. 
     In  FIGS. 4 and 5  a connecting element  25  is illustrated for use with profile bars  10  according to the invention. In a first embodiment, the connecting element  25  is constructed as an (aluminium) pressure die casting and comprises two support sections  26 ,  27  arranged at right angles to one another, in which respectively an elongated hole  28  is formed, which is aligned with the undercut groove  15 . The width B and height H of the two support sections  26 ,  27  is preferably likewise respectively 40 mm. 
     The support sections  26 ,  27  are constructed in square, plate-shaped support elements  29 ,  30 , which are connected with one another via reinforcing plates  41 ,  42  which are triangular-shaped in cross-section, which reinforcing plates are arranged on the opposite end faces of the support elements  29 ,  30 . Four extensions  32 ,  33  are arranged respectively on the undersides of the support elements  29 ,  30  facing away from the reinforcing plates  41 ,  42 . The extensions  32 ,  33  are constructed respectively approximately in cuboid shape with a rectangular cross-section, wherein the one extensions  32 , spaced apart from one another in longitudinal direction, are associated for example with the one additional longitudinal groove  17 , whilst the two other extensions  33 , likewise spaced apart in longitudinal direction, are associated with the second additional longitudinal groove  18 . The cross-section of the extensions  32 ,  33  is adapted in particular to the width b of the longitudinal grooves  17 ,  18  of a longitudinal groove pair  20 . 
     In an alternative embodiment of the production process of the connecting element  25 , this can also be constructed as a cold extruded part. Here, the extensions  32 ,  33  can either be constructed during the forming process or else as additional, pin-shaped components which are pressed for example into correspondingly prefabricated openings of the connecting element in a separate manufacturing step. 
     In  FIGS. 6 to 8  a profile assembly  100  is illustrated, consisting of at least two profile bars  10  according to the invention and a connecting element  25 , connecting the at least two profile bars  10  with one another. Here, the illustration of the connection between the connecting element  25  and the profile bars  10  is made, for simplicity, without the already mentioned anchoring system or respectively the sliding block, and its counter-element, arranged in the central channel  11 , which exerts the tensile force which has been mentioned onto the anchoring element or respectively the sliding block, wherein the mentioned parts are necessary in a profile assembly  100  for fixing the components (profile bars  10  and connecting element ( 25 ). In particular, however, it is conceivable that provision can be made in accordance with  FIG. 8 , to insert pins  34  in the longitudinal channels  21  (more precisely in end-face openings  40  formed by these) of the profile bar  10 , which lies with its end face on the lateral surface of the other profile bar  10 , which pins project over the end face  36  of the profile bar  10  and engage into the longitudinal channels  17 ,  18  of the longitudinal groove pair  20  of the other profile bar  10 . For this, the pins  34  have a diameter which corresponds approximately to the groove width of the longitudinal grooves  17 ,  18  of the longitudinal groove pair  20 . Through the use of the pins  34 , the profile bar  10 , which rests with its end face on the lateral surface of the other profile bar  10 , is prevented from twisting or respectively is positioned and fixed in an angular position to this. 
     Furthermore, the pins  34 , on introduction of a perpendicular to the longitudinal direction of the profile bar  10  carrying the pins  34 , stabilize or respectively reinforce the wall regions of the profile bar  10  arranged on both sides of the undercut groove  15 , in the additional longitudinal grooves  17 ,  18  of which profile bar the pins  34  engage. Thereby, these wall regions are prevented from bending open, caused by a tensile force onto the sliding block. Via the profile bar  10  carrying the pins  34 , torques introduced therein perpendicularly to its longitudinal axis can also be transferred directly into the other profile bar  10 , without the connecting element  25  being stressed for this. 
     In  FIG. 9  the profile bar  10 , from the end face of which the pins  34  project, is illustrated again in a single representation. The pins  34  can be notched pins, dowel pins or similar, which are axially fixed in the additional longitudinal channel  21 , in particular by a corresponding clamping—or press fit between the additional longitudinal channel  21  and the pin  34 . For this, the pins are introduced into the openings formed on the end face by the longitudinal channels. 
     From  FIG. 9  the position of the pins and also that of the longitudinal channels associated therewith relative to the longitudinal grooves  17 ,  18  of the longitudinal groove pairs  20  becomes particularly clear. In the embodiment shown, in which more than two longitudinal groove pairs  20  (on different lateral surfaces) are provided, it is essential that the longitudinal channels and hence consequently also the pins  34  are situated on intersection lines of longitudinal centre planes of two longitudinal grooves of different longitudinal groove pairs, wherein the longitudinal groove pairs are situated on lateral surfaces offset by 90° to one another. 
     Furthermore, the profile assembly  100 , as in  FIG. 20  in a modification to the illustration of  FIGS. 6 to 8  with the use of the pins  36  can also be constructed without the connecting element  25 . Thus in  FIG. 10 , the two profile bars  10  arranged at right angles to one another can be seen, wherein in the one profile bar  10  in its central channel  11  an anchoring element  50  is situated, which exerts a tensile force, directed in the direction of the anchoring element  50 , onto a sliding block  51  anchored in the undercut longitudinal groove  15  of the other profile bar  10 . 
     The production of a profile assembly  100  comprises the fastening of a profile bar  10  or of another element on a lateral surface of the profile bar  10  by means of a sliding block  51  or similar arranged in the central channel  11  of the profile bar  10 , and the application of a tensile force onto the sliding block  51  or similar, wherein extensions  43  or similar engage into the additional longitudinal grooves  17 ,  18  of the profile bar  10  carrying the sliding block  51  or similar, which extensions prevent the central channel  11  from an expansion as a result of the tensile force onto the sliding block  51  or similar. 
     In  FIG. 11 , modified profile bars  10   a  are illustrated, which form a profile assembly  100   a . The profile bars  10   a  have longitudinal grooves  17   a ,  18   a  forming longitudinal groove pairs  20   a , which longitudinal grooves are configured respectively in the form of an undercut groove. Thereby, two profile bars  10   a  can be connected with one another with the use of at least one double swallowtail-shaped connecting block  45  engaging in a form-fitting manner into opposite longitudinal grooves  17   a . In the illustration of  FIG. 11 , the two facing lateral faces of the profile bars  10   a  lie against one another. However, embodiments of the connecting block  45  are also conceivable, in which the latter spaces apart the two profile bars  10   a  parallel to one another in the manner of a spacer. 
     It is also conceivable that end-face pins of a further profile bar engage into the undercut longitudinal grooves. 
     The profile bar  10 ,  10   a  described so far, and its connecting element  25  and the connecting block  45  can be altered or respectively modified in a variety of ways without departing from the idea of the invention. Thus it is also conceivable, for example, to use the longitudinal channels  21  or respectively the longitudinal grooves  17 ,  17   a ,  18 ,  18   a  for fastening other (add-on) parts, such as for example a door element or similar. A profile assembly  100  can also be produced using a connecting element  25 , wherein the connecting element  25  has no extensions  32 ,  33 . 
     In  FIGS. 12 and 13 , views are shown, rotated through 90° to one another, of an alternative profile bar  10 , in which the two longitudinal grooves  17 ,  18  of the longitudinal groove pairs  20  are constructed as undercut longitudinal grooves to receive sliding blocks, for example. From the end-face view shown in  FIG. 12 , it can be seen that longitudinal channels  21  are provided on the end face, which are aligned to the longitudinal grooves  17 ,  18  of the longitudinal groove pairs  20  such that pins can be inserted into the end-face openings  40  formed by the longitudinal channels  21 , in an analogous manner to the example embodiment according to  FIG. 9 , which pins can then engage in longitudinal groves of an identically contoured profile bar which is arranged at a 90° angle to the profile bar which is shown. For this, the longitudinal channels  21  are situated respectively on an intersection line  35  of two longitudinal grooves of longitudinal groove pairs offset by 90° to one another. As in the example embodiment according to  FIG. 9 , the intersection lines  35  form the longitudinal central axes of the associated longitudinal channels  21 . 
     In the example embodiment according to  FIGS. 12 and 13 , the pins, which for reasons of clarity are not drawn, which are held in the longitudinal channels  21  by screwing or preferably by a press fit, serve substantially as a security against twisting of two profile bars put together to form a profile assembly.