Abstract:
A device for anchoring at least one fastening element in a laminate structure having at least two layers comprises a fastening element, and a carrier assembly on which the fastening element is mounted. The carrier assembly is designed with a protruding rib structure which radially outwardly surrounds the fastening element, resulting in a transmission of force into the laminate structure that is conducive to long-term stability of the anchoring.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application U.S. National Phase Patent Application based on International Application Serial No. PCT/EP2015/055598 filed Mar. 21, 2014, the disclosure of which is hereby explicitly incorporated by reference herein. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to to a device for anchoring at least one fastening element in a laminate structure having at least two layers. 
         [0004]    2. Description of the Related Art 
         [0005]    A device of this type is known from GB 1,096,812 A. The previously known device for anchoring at least one elongated fastening element, designed as a bolt, in a laminate structure having two layers has a support plate, designed with stamped projections, as a carrier assembly which is connected to the fastening element without play and configured for arrangement between the two layers of the laminate structure. 
         [0006]    The present invention provides a corrugated plate for fastening roofing decking membranes is known from U.S. Pat. No. 6,665,991 B2, having a number of circumferential corrugated rings situated concentrically around a central hole which is provided for passing a loose screw through. 
       SUMMARY OF THE INVENTION 
       [0007]    The present invention provides a device of the type mentioned at the outset, which is characterized by relatively high stability during anchoring of the, or each, fastening element. 
         [0008]    As a result of the carrier assembly according to the invention having a protruding rib structure which radially outwardly surrounds, at least in sections, the, or at least one, elongated fastening element in the circumferential direction, i.e., with a component at an angle relative to a radial direction predefined by a fastening element, the relatively high bending strength of the carrier assembly in the area of the, or each, fastening element surrounded by the rib structure results in high anchoring stability. 
         [0009]    In one form thereof, the present invention provides a device for anchoring at least one fastening element extending in a longitudinal direction, in a laminate structure having at least two layers, with a carrier assembly to which the fastening element is connected without play and which is configured for arrangement between two layers of the laminate structure, characterized in that the carrier assembly has a protruding rib structure, which radially outwardly surrounds, at least in sections, the, or at least one, fastening element in the circumferential direction. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]    The above mentioned and other features and objects of this invention, and the manner of attaining them, will become more apparent and the invention itself will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein: 
           [0011]      FIG. 1  shows in a sectional perspective view a first exemplary embodiment of a device according to the invention which is anchored in a laminate structure; 
           [0012]      FIG. 2  shows in a perspective view the first exemplary embodiment anchored in a laminate structure; 
           [0013]      FIG. 3  shows in a sectional perspective view a first refinement of the first exemplary embodiment anchored in a laminate structure; 
           [0014]      FIG. 4  shows in a top view the exposed first refinement of the first exemplary embodiment according to  FIG. 3 ; 
           [0015]      FIG. 5  shows in a perspective view a second refinement of the first exemplary embodiment anchored in a laminate structure; 
           [0016]      FIG. 6  shows in a top view the exposed second refinement of the first exemplary embodiment according to  FIG. 5 ; 
           [0017]      FIG. 7  shows in a perspective view a third refinement of the first exemplary embodiment anchored in a laminate structure; 
           [0018]      FIG. 8  shows, in a view from below, the exposed third refinement of the first exemplary embodiment according to  FIG. 7 ; 
           [0019]      FIG. 9  shows in a perspective view a fourth refinement of the first exemplary embodiment anchored in a laminate structure; 
           [0020]      FIG. 10  shows, in a view from below, the exposed fourth refinement of the first exemplary embodiment according to  FIG. 9 ; 
           [0021]      FIG. 11  shows in a side view the exposed fourth refinement of the first exemplary embodiment according to  FIG. 9 ; 
           [0022]      FIG. 12  shows in a perspective view a carrier assembly of a second exemplary embodiment of a device according to the invention, anchored in a laminate structure; 
           [0023]      FIG. 13  shows in a perspective view the arrangement according to  FIG. 12 ; 
           [0024]      FIG. 14  shows in a sectional perspective view the second exemplary embodiment anchored in a laminate structure, with a bolt as a fastening element mounted on the carrier assembly; 
           [0025]      FIG. 15  shows in a perspective view a first modification of the second exemplary embodiment anchored in a laminate structure; 
           [0026]      FIG. 16  shows in a perspective view a second modification of the second exemplary embodiment anchored in a laminate structure; 
           [0027]      FIG. 17  shows in a sectional perspective view a first refinement of the second exemplary embodiment anchored in a laminate structure; 
           [0028]      FIG. 18  shows in a sectional perspective view the exposed first refinement of the second exemplary embodiment according to  FIG. 17 ; 
           [0029]      FIG. 19  shows in a sectional view a second refinement of the second exemplary embodiment anchored in a laminate structure; 
           [0030]      FIG. 20  shows in a perspective view the exposed second refinement of the second exemplary embodiment according to  FIG. 19 ; 
           [0031]      FIG. 21  shows in a sectional view a third refinement of the second exemplary embodiment anchored in a laminate structure; 
           [0032]      FIG. 22  shows in a perspective sectional view the exposed third refinement of the second exemplary embodiment according to  FIG. 21 ; 
           [0033]      FIG. 23  shows in a sectional perspective view a fourth refinement of the second exemplary embodiment anchored in a laminate structure; 
           [0034]      FIG. 24  shows in a perspective view the exposed fourth refinement of the second exemplary embodiment according to  FIG. 23 ; 
           [0035]      FIG. 25  shows in a sectional perspective view a fifth refinement of the second exemplary embodiment anchored in a laminate structure; 
           [0036]      FIG. 26  shows in a perspective view the exposed fifth refinement of the second exemplary embodiment according to  FIG. 25 ; 
           [0037]      FIG. 27  shows in a sectional perspective view a third exemplary embodiment of a device according to the invention anchored in a laminate structure; 
           [0038]      FIG. 28  shows in a sectional perspective view the exposed third exemplary embodiment; 
           [0039]      FIG. 29  shows in a top view the exposed third exemplary embodiment; 
           [0040]      FIG. 30  shows in a top view an exposed first refinement of the third exemplary embodiment; 
           [0041]      FIG. 31  shows in a sectional side view the first refinement of the third exemplary embodiment according to  FIG. 30 , anchored in a laminate structure; 
           [0042]      FIG. 32  shows in a sectional perspective view a second refinement of the third exemplary embodiment according to  FIG. 27 , anchored in a laminate structure; 
           [0043]      FIG. 33  shows in a perspective view an inner plate of the second modification of the third exemplary embodiment according to  FIG. 32 ; 
           [0044]      FIG. 34  shows in a perspective view an outer plate of the second modification of the third exemplary embodiment according to  FIG. 32 ; 
           [0045]      FIG. 35  shows in a perspective view the exposed second modification of the third exemplary embodiment according to  FIG. 32 , with the inner plate and the outer plate in an assembled arrangement; 
           [0046]      FIG. 36  shows in a sectional perspective view a fourth exemplary embodiment of a device according to the invention anchored in a laminate structure; 
           [0047]      FIG. 37  shows in a perspective view an inner plate of the fourth exemplary embodiment according to  FIG. 36 ; and 
           [0048]      FIG. 38  shows in a perspective view an outer plate of the fourth exemplary embodiment according to  FIG. 36 . 
       
    
    
       [0049]    Corresponding reference characters indicate corresponding parts throughout the several views. Although the exemplifications set out herein illustrate embodiments of the invention, the embodiments disclosed below are not intended to be exhaustive or to be construed as limiting the scope of the invention to the precise forms disclosed. 
       DETAILED DESCRIPTION 
       [0050]      FIG. 1  shows in a sectional perspective view a laminate structure  1  which has a first laminate cover layer  2  and a second laminate cover layer  3 . The laminate cover layers  2 ,  3  are woven glass fiber or carbon fiber mats, for example, which have been impregnated with a resin that has been subsequently cured in order to form the laminate structure  1 . 
         [0051]      FIG. 1  also illustrates a first exemplary embodiment of a device according to the invention, which as a carrier assembly has a base plate  4  situated between the laminate cover layers  2 ,  3 . In the first exemplary embodiment, the base plate  4  is formed with an arched rib  5  as a rib structure, which has a circumferentially closed design around a central area. The rib  5  is situated between a centrally located inner section  6  and an outer section  7  situated on the radially outward side of the inner section  6 , and on one side of the base plate  4  is elevated across a plane in which both the inner section  6  and the outer section  7  are situated. In the first exemplary embodiment illustrated in  FIG. 1 , the rib  5  has a rounded arched design over the inner section  6  and the outer section  7 . 
         [0052]    It is also apparent from the illustration according to  FIG. 1  that in the inner section  6 , a cylindrical fastening bolt  8 , which is radially outwardly surrounded by the rib  5 , is mounted, advantageously in a fixed manner, on the base plate  4  without play as a fastening element, which extends in a longitudinal direction. The fastening bolt  8  protrudes, in the same direction as the rib  5 , beyond the inner section  6  and beyond the outer section  7  of the base plate  4 , and either has a smooth-walled design or is provided with an external thread. In the first exemplary embodiment illustrated in  FIG. 1 , the fastening bolt  8  passes through the first laminate cover layer  2 , which is situated on the side of the base plate  4  containing the elevated portion of the rib  5 . 
         [0053]    It is also apparent from the illustration according to  FIG. 1  that the laminate cover layers  2 ,  3  adjoin one another on the radially outer side of the outer section  7  of the base plate  4 , and during formation of the laminate structure  1  are fixedly joined together, while in the area of the base plate  4  they cover the outer sides of the base plate  4  with a positive fit, so that the base plate  4 , and thus also the fastening bolt  8  which is fixedly connected to the base plate  4 , are anchored in the laminate structure  1  or connected thereto, essentially without play. 
         [0054]      FIG. 2  shows in a top view the first exemplary embodiment according to  FIG. 1 . It is apparent from  FIG. 2  that in this exemplary embodiment the rib  5  is formed from four straight rib sections  9 ,  10 ,  11 ,  12  of equal length, which in the circumferential direction, i.e., at an angle relative to a radial direction determined by the centrally situated fastening bolt  8 , are oriented in pairs at right angles to one another, abut one another in rounded corner areas, and enclose the fastening bolt  8  with a basic square shape in the manner of a cage. 
         [0055]    The design of the rib structure formed by the rib  5  results in high bending strength of the base plate  4 , thus also achieving a relatively uniform transmission of forces, in particular bending forces acting on the fastening bolt  8 , into the laminate structure  1 . For this purpose, the rib  6  is oriented in a so-called 0 degree/90 degree cross ply of the laminate structure  1  in parallel or at right angles to the fiber direction of the laminate cover layer  2 ,  3 . The advantageous distribution of rigidity results in higher rigidity in the center in order to avoid detachment of the laminate cover layer  3  facing away from the fastening bolt, and results in lower rigidity at the outer edge, so that on account of flexibility, delamination is prevented. 
         [0056]      FIG. 3  shows in a perspective view a refinement of the first exemplary embodiment anchored in a laminate structure  1 ; in the first refinement of the first exemplary embodiment and in the first exemplary embodiment itself, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. In the first modification of the first exemplary embodiment according to  FIG. 3 , a number of straight flared tongues  13  are formed in the transition area from the inner section  6  and the rib  5 , which extend radially outwardly from the inner section  6  and protrude beyond the inner section  6  on the side of the base plate  4  facing away from the rib  5 . The straight flared tongues  13  engage with the second laminate cover layer  3  situated on this side of the base plate  4 , thus increasing the adhesiveness and also ensuring that the base plate  4  in particular is then stable against lateral shifting in the event that detachment occurs in areas between the base plate  4  and the laminate cover layers  2 ,  3 , or the connection between the laminate cover layers  2 ,  3  in the edge area of the base plate  4  is no longer sufficiently stable. 
         [0057]    The flared tongues  13  also ensure prefixing of the device according to the invention on a textile preform layer as a subsequent laminate structure  1 , so that during transport, the device together with a preform remains fixed in a mold, and during the subsequent impregnation with resin in the mold, remains fixed in position on the laminate structure  1 . This correspondingly applies for all analogous exemplary embodiments and modifications. 
         [0058]      FIG. 4  shows in a top view the exposed first refinement of the first exemplary embodiment according to  FIG. 3 . It is apparent from  FIG. 4  that the straight flared tongues  13  are situated in the rounded corner areas of the rib  5 , and lie in tongue recesses  14  formed in the base plate  4 . It is also apparent from the illustration according to  FIG. 4  that the base plate  4  in the first refinement of the first exemplary embodiment and the first exemplary embodiment itself according to  FIG. 1  have a circular design. 
         [0059]      FIG. 5  shows in a perspective view a second refinement of the first exemplary embodiment anchored in a laminate structure  1 ; in the second refinement of the first exemplary embodiment and in the first refinement of the first exemplary embodiment, as well as in the first exemplary embodiment itself, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. In the second refinement of the first exemplary embodiment according to  FIG. 5 , a number of angled flared tongues  15  are present, which extend radially outwardly from the inner section  6  into a vertex, which has its highest elevation across the inner section  6  and the outer section  7 , and protrude, opposite from the rib  5 , beyond the plane in which the inner section  6  and the outer section  7  are situated. The angled flared tongues  15  each have a flared section  16  connected to the inner section  6 , and an end section  17 , which is situated on the side of the flared section  16  facing away from the inner section  6  and bent back with respect to the flared section  16  in the direction of the rib  5 , and rests on the outer side of the second laminate cover layer  3 . 
         [0060]      FIG. 6  shows in a top view the exposed second refinement of the first exemplary embodiment according to  FIG. 5 . It is apparent from the illustration according to  FIG. 6  that, like the the straight flared tongues  13  in the first refinement of the first exemplary embodiment, the angled flared tongues  15  also extend radially outwardly from the inner section  6 , and are situated in the corner areas of the rib  5  in tongue recesses  14  which extend across the vertex of the rib  5 . The rib  5  is thus interrupted in sections in the radial direction, so that rigidity peaks, which would otherwise be present in the corner areas, are reduced. 
         [0061]      FIG. 7  shows in a sectional perspective view a third refinement of the first exemplary embodiment anchored in a laminate structure  1 ; in the third refinement of the first exemplary embodiment and in the refinements of the first exemplary embodiment explained above as well as in the first exemplary embodiment itself, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. The third refinement of the first exemplary embodiment according to  FIG. 7  differs from the second refinement of the first exemplary embodiment essentially in that the end section  17  is not bent back with respect to the flared section  16  in the direction of the rib  5 , but instead extends away from the plane in which the inner section  6  and the outer section  7  are situated, but with a flatter flare angle compared to the flare angle of the flared sections  16 . A closed pressure ring  19  is situated in the free space thus formed between the rib  5  and the end sections  17  in the third refinement of the first exemplary embodiment, and engages behind the progression of the rib  5  following the second laminate cover layer  3 , and in particular with appropriate pretensioning of the angled flared tongues  15 , is conducive to the positive fit between the second laminate cover layer  3  and the rib  5 , for example during curing. 
         [0062]      FIG. 8  shows, in a view from below, the third refinement of the first exemplary embodiment according to  FIG. 7 , with the end sections  17  of the angled flared tongues  15  which extend beyond the vertex of the rib  5  situated in the corner areas of the rib  5 , corresponding to the second refinement of the second exemplary embodiment. 
         [0063]      FIG. 9  shows, in a perspective sectional view corresponding to  FIG. 1 , a fourth refinement of the first exemplary embodiment anchored in a laminate structure  1 ; in the fourth refinement of the first exemplary embodiment and in the refinements of the first exemplary embodiment explained above and in the first exemplary embodiment itself, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. In the fourth refinement of the first exemplary embodiment according to  FIG. 9 , the inner section  6  of the base plate  4  has engaging nubs  20 , which protrude on the side facing away from the fastening bolt  8 , and which in the illustration according to  FIG. 9  engage in a claw-like manner with the second laminate cover layer  3  situated on this side of the base plate  4 , and thus improve the connection between the inner section  6  and the second laminate cover layer  3 , which is advantageous, in particular when the fastening bolt  8  is under heavy load. 
         [0064]      FIG. 10  shows, in a view from below, the exposed fourth refinement of the first exemplary embodiment according to  FIG. 9 . It is apparent from  FIG. 10  that in this refinement, the engaging nubs  20  are situated in the inner section  6  in a uniform checkered pattern at distances corresponding to the structural dimensions of the laminate structure  1 . 
         [0065]      FIG. 11  shows in a side view the exposed fourth refinement of the first exemplary embodiment according to  FIGS. 9 and 10 , from which it is apparent that the engaging nubs  20  have been carved out of the base plate  4  by notch-like removal of a certain material thickness. 
         [0066]      FIG. 12  shows, in a perspective view corresponding to  FIG. 1 , a carrier assembly, designed as a base plate  4 , of a second exemplary embodiment of a device according to the invention anchored in a laminate structure  1 ; in the second exemplary embodiment according to  FIG. 12  and in the first exemplary embodiment explained with reference to  FIGS. 1 and 2 , with associated refinements, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. The second exemplary embodiment according to  FIG. 12 , in addition to the rib  5  as a rib structure for improving the rigidity profile of the base plate  4  in the area of the outer section  7 , has a reinforcing bevel  21 , situated approximately in the middle between the rib  5  and the outer edge of the outer section  7 , which divides the outer section  7  into an intermediate area  22  adjacent to the rib  5 , and a radially outwardly situated edge area  23 . The intermediate area  22  lies in the plane in which the inner section  6  of the base plate  4  is also situated, while the edge area  23 , due to an inclined position of the reinforcing bevel  21  on the same side as the rib  5 , lies in a plane with the vertex of the rib  5 . It is also apparent from  FIG. 12  that the first laminate cover layer  2  resting on the elevated area of the rib  5  has a fastening element recess  24  in the area of the inner section  6 , through which a fastening element, not illustrated in  FIG. 12 , may pass unimpeded through the first laminate cover layer  2 . 
         [0067]      FIG. 13  shows in a perspective view the arrangement according to  FIG. 12 . It is apparent from  FIG. 13  that in this exemplary embodiment, the reinforcing bevel  21  surrounds the rib  5 , which has an essentially square perimeter, in a circle corresponding to the outer geometry of the base plate  4 , which is likewise circular here. 
         [0068]      FIG. 14  shows, in a sectional perspective view corresponding to  FIG. 1 , the second exemplary embodiment according to  FIGS. 12 and 13  with a fastening bolt  8  as fastening element, which is fixedly mounted on the base plate  4  to form a device according to the invention. 
         [0069]    The second exemplary embodiment is suited in particular for anchoring situations in which high bending forces act on a fastening element, such as a fastening bolt  8 , which is surrounded by the rib  5 . 
         [0070]      FIG. 15  shows in a sectional perspective view a first modification of the second exemplary embodiment explained with reference to  FIGS. 12 to 14 , having a reinforcing bevel  21  and anchored in a laminate structure  1 , in the first modification according to  FIG. 15  the fastening element being formed as a cylindrical flared sleeve  25  which is worked out in one piece from the inner section  6  of the base plate  4 , and which extends beyond the vertex of the rib  5  in the axial direction. 
         [0071]      FIG. 16  shows, in a sectional perspective view corresponding to  FIG. 1 , a second modification of the second exemplary embodiment anchored in a laminate structure  1 ; in the second modification of the second exemplary embodiment and in the first modification of the second exemplary embodiment, as well as in the second exemplary embodiment itself, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. The second modification of the second exemplary embodiment according to  FIG. 15  [sic;  16 ] is characterized in that the flared sleeve  25  has a tapered cross section in a head section  26  facing away from the inner section  6 , and is formed with radially inwardly projecting retaining tongues  27  which secure a locking ring  28  situated between the retaining tongues  27  and the head section  26 . In the second modification of the second exemplary embodiment according to  FIG. 16 , the locking ring  28  may be utilized for a locking connection with an adaptable add-on element, not illustrated in  FIG. 16 . 
         [0072]      FIG. 17  shows, in a sectional perspective view corresponding to  FIG. 1 , a first refinement of the second exemplary embodiment anchored in a laminate structure  1 ; in the first refinement of the second exemplary embodiment and in the modifications of the second exemplary embodiment, as well as in the second exemplary embodiment itself, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. The first refinement of the second exemplary embodiment according to  FIG. 17  has a number of radially outwardly extending flared tongues  29  which are formed on the radially outer side of the intermediate area  22 , and which are flared at an angle out of the plane in which the inner section  6  and the intermediate area  22  are situated, opposite from the reinforcing bevel  21 . This results in engagement with the second laminate cover layer  3  situated on this side of the base plate  4 , with a corresponding permanent connection between the base plate  4  and the second laminate cover layer  3 . 
         [0073]      FIG. 18  shows in a sectional perspective view the exposed first refinement of the second exemplary embodiment according to  FIG. 17 . It is apparent from the illustration according to  FIG. 18  that the claw tongues  29  have pointed tips to ensure reliable engagement with the second laminate cover layer  3  illustrated in  FIG. 17 . 
         [0074]      FIG. 19  shows in a sectional side view a second refinement of the second exemplary embodiment anchored in a laminate structure  1 ; in the second refinement of the second exemplary embodiment and in the first refinement of the second exemplary embodiment, as well as in the second exemplary embodiment itself with associated modifications, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. The second refinement of the second exemplary embodiment according to  FIG. 19  is characterized in that flared tongues  30  are formed in the reinforcing bevel  21 , and with a pointed section protrude beyond the plane in which the edge area  23  of the outer section  7  and the vertex of the rib  5  are situated. This results in engagement with the first laminate cover layer  2  situated on the elevated area of the rib  5 , with a correspondingly good connection with same. 
         [0075]      FIG. 20  shows in a perspective view the second refinement of the second exemplary embodiment according to  FIG. 19 , anchored in a laminate structure  1 . It is apparent from the illustration according to  FIG. 20  that the flared tongues  30  are situated in the radial direction in alignment with the corner areas of the rib  5  and the fastening bolt  8  in order to achieve a particularly reliable connection with the first laminate cover layer  2  in these axes. 
         [0076]      FIG. 21  shows, in a side view corresponding to  FIG. 19 , a third refinement of the second exemplary embodiment anchored in a laminate structure  1 ; in the third refinement of the second exemplary embodiment and in the refinements of the second exemplary embodiment explained above and in the second exemplary embodiment itself with associated modifications, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. In the third refinement of the second exemplary embodiment, ring retaining tongues  31  are formed on the base plate  4  on the radially inner side of the edge area  23 , and protrude at approximately right angles from the side facing away from the fastening bolt  8 , and are curved radially inwardly in an open circular arc and retain a pressure ring  32 . The second laminate cover layer  3 , situated on the side of the base plate  4  facing away from the fastening bolt  8 , may be pressed against the reinforcing bevel  21  by means of the pressure ring  32  with appropriate pretensioning of the ring retaining tongues  31 . 
         [0077]      FIG. 22  shows in a sectional perspective view the exposed third refinement of the second exemplary embodiment according to  FIG. 21 . It is apparent from  22  that the ring retaining tongues  31  are situated at regular intervals around the circumference, resting in retaining tongue recesses  33  formed in the reinforcing bevel  21 . 
         [0078]      FIG. 23  shows in a sectional perspective view a fourth refinement of the second exemplary embodiment anchored in a laminate structure  1 ; in the fourth refinement of the second exemplary embodiment and the refinements of the second exemplary embodiment explained above and in the second exemplary embodiment itself with associated modifications, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. The fourth refinement of the second exemplary embodiment according to  FIG. 23  is characterized in that a number of axial tongues  34  are formed on the radially outer side of the edge area  23 , and extend at right angles on both sides away from the plane in which the edge area  23  and the vertex of the rib  5  are situated, and engage with the first laminate cover layer  2  and with the second laminate cover layer  3 . 
         [0079]      FIG. 24  shows in a perspective view the exposed fourth refinement of the second exemplary embodiment according to  FIG. 23 . It is clearly apparent from  FIG. 24  that the axial tongues  34  protrude in alternation from both sides of the edge area  23  in the circumferential direction and are spaced comparatively close to one another, thus ensuring very good prefixing in still dry laminate cover layers  2 ,  3 , and final anchoring of the base plate  4  in both laminate cover layers  2 ,  3  of the laminate structure  1 . 
         [0080]      FIG. 25  shows in a sectional perspective view a fifth refinement of the second exemplary embodiment anchored in a laminate structure  1 ; in the fifth refinement of the second exemplary embodiment and in the refinements of the second exemplary embodiment explained above and in the second exemplary embodiment itself together with modifications, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. In the fifth refinement of the second exemplary embodiment according to  FIG. 25 , a number of rear engagement tongues  35  are present, which are connected to the edge area  23 , and in the axial direction are situated on the side of the base plate facing away from the fastening bolt  8 , at a distance from the edge area  23 . The rear engagement tongues  35  thus engage behind the second laminate cover layer  3  situated on the side of the base plate  4  facing away from the fastening bolt  8 , and secure the second laminate cover from detaching from the base plate  4 . 
         [0081]      FIG. 26  shows in a perspective view the fifth refinement of the second exemplary embodiment according to  FIG. 25 . It is apparent from the illustration according to  FIG. 26  that the rear engagement tongues  35  extend circumferentially in the same direction, and have a pointed end section  37  which is connected to a flared section  36 , the end sections  37  being oriented circumferentially in the same direction. 
         [0082]    For assembly, the device according to the invention according to  FIG. 26  is placed on a laminate layer  3  and rotated with light pressure. In the process, the end section  37  works into the laminate layer  3  (for woven fabrics, between the warp/weft, or for cross plies, between the at least two differently oriented layers), forming an undercut between the edge area  23  and the laminate layer  3 . This allows stable prefixing of the device according to the invention on the laminate layer  3 . 
         [0083]      FIG. 27  shows in a perspective sectional view a third exemplary embodiment of a device according to the invention anchored in a laminate structure  1 ; in the third exemplary embodiment and the exemplary embodiments with refinements and modifications explained above, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. In the third exemplary embodiment according to  FIG. 27 , the carrier assembly has a two-part design with an inner plate  38  and an outer plate  39 , which are placed one on top of the other with an overlap in sections. The material thickness of the inner plate  38  is greater than the material thickness of the outer plate  39 . A centrally situated flared sleeve  40  is formed on the inner plate  38 , corresponding to the first modification of the second exemplary embodiment according to  FIG. 15 . The flared sleeve  40  is surrounded at a radial distance by an outer rib  41  of a rib structure. The outer plate  39  radially inwardly adjoins the flared sleeve  40 , and on the radially inner side is formed with an inner rib  42  of the rib structure, which conforms to the shape of the outer rib  41  of the inner plate  38 , so that when the outer plate  39  is placed on the side of the inner plate  38  facing the flared sleeve  40 , the inner rib  42  of the outer plate  39  comes to rest on the outer rib  41  of the inner plate  38  with a positive fit. 
         [0084]    The outer plate  39 , corresponding to the second exemplary embodiment according to  FIG. 12 , has a reinforcing bevel  43  which is situated on the radially outer side of the inner rib  42 , and which separates an intermediate area  44 , adjoining the inner rib  42  on the radially inner side, from an edge area  45  situated on the radially outer side of the reinforcing bevel  43 ; also in the third exemplary embodiment according to  FIG. 27 , the intermediate area  44  and the edge area  45  are situated in different planes in the axial direction. 
         [0085]      FIG. 28  shows in a sectional perspective view the exposed third exemplary embodiment according to  FIG. 27 . It is apparent from  FIG. 28  that, corresponding to the first exemplary embodiment according to  FIG. 1  and the second exemplary embodiment according to  FIG. 14 , the outer rib  41  of the inner plate  38  as well as the inner rib  42  of the outer plate  39  have a number of straight rib sections  46 ,  47  which have essentially the same length and are oriented in pairs at right angles to one another. 
         [0086]      FIG. 29  shows in an exposed top view the third exemplary embodiment according to  FIG. 27 . It is apparent from the illustration according to  FIG. 29  that in the third exemplary embodiment according to  FIG. 27 , the outer plate  39  has a circular design, and the outer plate  39  completely covers the inner plate  38  from the side on which the flared sleeve  40  is situated. The originally loose combination of the inner plate  38  and the outer plate  39  becomes tight in the axial direction upon anchoring in the laminate structure  1 . 
         [0087]    The inner plate  38  and the outer plate  39  have already been prefixed during assembly by means of the so-called spring nut principle. The features of the spring nut principle are implemented in the outer plate  39  by the rib sections  46 ,  47  and by the upwardly arched rib structure  9 . This prefixing is sufficient for introducing the inner plate  38  and the outer plate  39 , also without shifting in dry fabric layers which subsequently form the laminate structure  1 . The final fixing takes place after the resin with which the fabric layers have been impregnated has cured. 
         [0088]      FIG. 30  shows in a top view an exposed first refinement of the third exemplary embodiment; in the first refinement of the third exemplary embodiment and in the third exemplary embodiment itself, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. In the corner areas of the rib sections  47  of the inner rib  42  of the outer plate  39 , the first refinement of the third exemplary embodiment according to  FIG. 30  in each case has a securing tongue  48  as a connecting structure, which is situated in a securing tongue recess  49  formed in the inner rib  41  and protrudes radially inwardly. The securing tongues  48  are situated in the plane of the intermediate area  44  of the outer plate  39 , and engage behind the radially outer edge of the outer rib  41  of the inner plate  38 . 
         [0089]      FIG. 31  shows in a sectional side view the first refinement of the third exemplary embodiment according to  FIG. 30 , anchored in a laminate structure  1  which now also has a laminate intermediate layer  63 . The laminate intermediate layer  63  is situated between the inner plate  38  and the outer plate  39 , and is connected to the laminate cover layers  2 ,  3  on the radially outer side of the outer plate  39 . In the dry state, the laminate intermediate layer  63  is used to facilitate handling during formation of the laminate structure  1 , and provides improved strength in the edge area of the inner plate  38  and in the connection of the inner plate  38  to the laminate cover layer  3  facing away from the fastening element  40 . It is also apparent from  FIG. 31  that the securing tongues  48  engage behind the outer edge of the outer rib  41  of the inner plate  38  with approximately one-half the material thickness of the inner plate  38 , so that the inner plate  38  and the outer plate  39  may also be joined outside the laminate structure  1  by pressing the inner plate  38  onto the outer plate  39  until the securing tongues  48  engage from behind. This results in simple handling of two-part devices according to the invention during the anchoring in the laminate structure  1 . 
         [0090]      FIG. 32  shows in a sectional perspective view a second refinement of the third exemplary embodiment anchored in a laminate structure  1 ; in the second refinement of the third exemplary embodiment and in the first refinement of the third exemplary embodiment, as well as in the third exemplary embodiment itself, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. The second refinement of the third exemplary embodiment according to  FIG. 32  has receiving webs  50  of a connecting structure which are formed on the radially outer side of the inner plate  38 , and which extend away from the outer rib  41  on the side of the inner plate  38  facing away from the flared sleeve  40 . Receiving tongues  51  of the connecting structure are formed on the outer plate  39 , which are connected to the edge area  45  on the radially outer side and follow the contour of the edge area  45 , the reinforcing bevel  43 , and the intermediate area  44  at a distance therefrom, extend radially inwardly in the direction of the receiving webs  50 , and engage with the receiving webs  50 . End sections  52 , angled in the direction of the inner rib  42 , are formed on the receiving tongues  51 , and also protrude radially inwardly beyond the receiving webs  50 . 
         [0091]    It is apparent from the illustration according to  FIG. 32  that the receiving tongues  51  engage behind the second laminate cover layer  3  situated on the side of the outer plate  39  facing away from the flared sleeve  40 , and the end sections  42  engage with the second laminate cover layer  3 . This ensures reliable anchoring in the laminate structure  1 . 
         [0092]      FIG. 33  shows in a perspective view the inner plate  38  in the second refinement of the third exemplary embodiment according to  FIG. 32 . It is apparent from the illustration according to  FIG. 33  that the receiving webs  50  at their free ends have a tapered arrowhead design, are centrally molded onto the rib sections  46  of the inner plate  38  between the corner areas, and each have a slot-like receiving recess  53  for a respective receiving tongue  51 . The receiving recesses  53  extend in parallel to the outer rib  41  and are open on the same respective side in the circumferential direction, so that the receiving tongues  51  are introducible into the receiving recesses  53  due to deflection which is forced by sliding over the receiving webs  50 , and subsequent snapping in. 
         [0093]      FIG. 34  shows in a perspective view the outer plate  39  in the second refinement of the third exemplary embodiment according to  FIG. 32 . It is apparent from the illustration according to  FIG. 34  that the receiving tongues  51  are each connected to the edge area  45  via a connecting section  54 , and in the relaxed configuration are situated at a distance from and parallel to the contour of the outer plate  39  in the radial direction. 
         [0094]      FIG. 35  shows in a perspective view the exposed second refinement of the third exemplary embodiment according to  FIG. 32 . It is apparent from the illustration according to  FIG. 35  that in the assembled arrangement of the inner plate  38  and the outer plate  39 , the receiving tongues  51  are situated in the receiving recesses  53  without play in the axial direction, and lie flush against the end wall of the receiving recess  53  in question. As a result, the inner plate  38  is very stable, but optionally is also detachably connected to the outer plate  39 . 
         [0095]      FIG. 36  shows in a sectional perspective view a fourth exemplary embodiment of a device according to the invention anchored in a laminate structure  1 ; in the fourth exemplary embodiment and in the refinements explained above of the exemplary embodiments explained above and in these exemplary embodiments themselves with modifications, mutually corresponding elements are provided with the same reference numerals and are not explained in greater detail below. The fourth exemplary embodiment according to  FIG. 36 , corresponding to the third exemplary embodiment, likewise has a two-part carrier assembly with an inner plate  55  and an outer plate  56  which protrudes radially outwardly beyond the inner plate  55 , and which in the present case, however, have the same material thickness. In the fourth exemplary embodiment according to  FIG. 36 , the fastening element is formed on the outer plate  56  in the shape of a flared sleeve  57 . At a radial distance from the flared sleeve  57 , the outer plate  56  is formed with an inner rib  58 , which is elevated in the same direction as the flared sleeve  57  with respect to the other areas of the outer plate  56 . The outer plate  56  has a planar design on the radially outer side of the inner rib  58 . 
         [0096]    The inner plate  55  is formed with an outer rib  59 , which is situated on the outer side of a planar center area  60  of the inner plate  55 , and which is designed in such a way that it follows the outer contour of the inner rib  58  of the outer plate  56 . On the radially outer side of the outer rib  57 , the inner plate  55  is formed with a number of turned-up tongues  61  of a connecting structure, which in the arrangement according to  FIG. 36  pass through push-through recesses  62  of the connecting structure formed in the outer plate  56  on the radially outer side of the inner rib  58 , and which are situated radially inwardly facing the inner rib  58 , resting on the side of the outer plate  56  facing away from the inner plate  55 . In the arrangement according to  FIG. 36 , a laminate intermediate layer  63  of the laminate structure  1  is inserted between the first laminate cover layer  2  and the second laminate cover layer  3 , and is situated between the inner plate  55  and the outer plate  56 , and is penetrated by the turned-up tongues  61  at a connecting section  64 . 
         [0097]      FIG. 37  shows in a perspective view the inner plate  55  of the fourth exemplary embodiment according to  FIG. 36 . It is apparent from the illustration according to  FIG. 37  that the turned-up tongues  61  are situated at uniform intervals along the outer edge of the inner plate  55 , and are formed with tapering end sections having pointed tips. A laminate intermediate layer  63  may be perforated very easily in this way. 
         [0098]      FIG. 38  shows in a perspective view the outer plate  56  of the fourth exemplary embodiment according to  FIG. 36 . It is apparent from the illustration according to  FIG. 38  that the outer plate  56  has a number of push-through recesses  62  which correspond to the number of turned-up tongues  61  of the inner plate  55 , and which are situated between the inner rib  58  and the outer edge of the outer plate  56 , and positioned and dimensioned for play-free or essentially play-free accommodation of the turned-up tongues  61 . 
         [0099]    The fourth exemplary embodiment, explained with reference to  FIG. 36  to  FIG. 38 , is characterized in that the combination of the inner plate  55  and the outer plate  56  is prefixable on a laminate intermediate layer  63  before the laminate structure  1  together with the laminate cover layers  2 ,  3  are completed. 
         [0100]    It is understood that the structures formed on the radially inner side of the vertex of the rib  5 , for example the straight flared tongues  13 , the angled flared tongues  15 , or the engaging nubs  20 , may be combined with the features situated on the radially outer side of the rib  5 , such as the claw tongues  29 , the flared tongues  30 , the ring retaining tongues  31 , the axial tongues  34 , or the rear engagement tongues  35 , for modifications of the invention which are not illustrated, in order to achieve, over the entire diameter of devices according to the invention, good adhesion with the laminate cover layers  2 ,  3 , and thus prefixing in the still dry state of the laminate cover layers  2 ,  3  and final anchoring in the laminate structure. 
         [0101]    While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.