Abstract:
The invention relates to a fixing device comprising a closing part ( 8 ) which comprises a head plate ( 9 ) and a base shaft ( 11 ) equipped with clips ( 24 ). Spring webs are arranged on the base shaft ( 11 ) whereon a clip ( 24 ) is arranged, webbed wings are formed and journals are embodied. The receiving element ( 12 ) also comprises an edge wall ( 14 ) which is fitted with projecting sections and recesses, in addition to a profile surface. When the closing part is in the mounted state, the journals are arranged in a first recess and the spring webs are in a rear engaging position, wherein the clips engage behind the component ( 3 ). When the closing part ( 8 ) is in the demounted state, the journals are arranged in a second recess and the spring webs in a released position, wherein the journals are arranged in an engaging-free manner in relation to the rear engaging position. As a result, the components ( 1, 2, 3 ) are clipped together and can be detached from each other in a very simple manner.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
       [0001]    This application is a U.S. National Phase Patent Application based on International Application Serial No. PCT/EP2007/001991 filed Mar. 8, 2007, 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 concerns a fastening arrangement. 
         [0004]    2. Description of the Related Art 
         [0005]    One fastening arrangement is known from DE 93 11 243 U1. The prior fastening arrangement for interconnecting two elements comprises a rotatable locking part having a head plate that comes to rest against a first element, and a foot shaft, which is joined to the head plate and extends away from it in the axial direction. Formed on the foot shaft are radially outwardly extending catch noses configured to engage behind a second element. The prior fastening arrangement further comprises, configured on the first element, a receiving element for the locking part. The prior fastening arrangement also includes a spring element in the form of a helical spring, which surrounds the foot shaft and is disposed between the head plate and a floor wall of the receiving element. In a pre-mounted position, the catch noses engage behind the back side of the receiving element, i.e., the side facing the spring element, whereas in a final mounted position, in order to connect the first element, comprising the receiving element, to a second element, the locking part is rotated 90 degrees, further compressing the spring element, such that the catch noses then engage behind the second element. 
       SUMMARY OF THE INVENTION 
       [0006]    The present invention provides a fastening arrangement by means of which the elements can be interconnected by mating and can be taken apart again in a very simple manner. 
         [0007]    By virtue of the fact that in the inventive fastening arrangement, the catch noses are affixed to radially resilient spring webs, which as a result of the interaction of the web wings and the edge wall can be moved between a mounted position and a demounted position, these two positions being clearly defined by the engagement of the bearing tenon in depressions, in order to be interconnected the elements can be mated to one another by means of projecting catch noses that engage behind the second element after the interconnection is completed, whereas in order to separate the elements the locking part is rotated into the demounted position in which the catch noses are out of engagement with the second element, such that the elements can then be taken apart again. 
         [0008]    In one form thereof, the present invention provides a fastening arrangement for interconnecting at least two elements and including a locking part having a head plate, which comes to rest against a first element, and a foot shaft, which is joined to the head plate and extends away from the head plate in the axial direction, and on which are formed radially outwardly extending catch noses provided to engage behind a second element, and further including, configured on the first element, a receiving element for the locking part, characterized in that resilient spring webs movable in a radial direction are configured on the foot shaft, each catch nose is disposed on an associated spring web, each spring web includes a radially outwardly extending web wing in a region adjacent the head plate, radially outwardly projecting bearing tenons are configured on the foot shaft, the receiving element is further configured to include an edge wall cooperating with the web wings and including inwardly convex portions that project inwardly in a radial direction and outwardly concave portions that recede outwardly in a radial direction, and to include a profiled surface that cooperates with the bearing tenons and is configured with depressions extending in the axial direction, wherein, in a mounted position of the locking part, the bearing tenons are disposed in ones of the first depressions and the spring webs are in a rear engagement position in which the catch noses are disposed to engage behind the second element, and wherein, in a demounted position of the locking part, the bearing tenons are disposed in ones of the second depressions, and the spring webs, by virtue of the web wings being disposed in ones of the inwardly convex portions of the edge wall, are in a released position in which the catch noses are in an arrangement such that they are shifted inwardly in relation to the rear-engagement position and are out of engagement with the second element. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]    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: 
           [0010]      FIG. 1  is a perspective view of an exemplary embodiment of a fastening arrangement according to the invention for interconnecting a total of three elements; 
           [0011]      FIG. 2  is a side view of a locking part of the fastening arrangement according to  FIG. 1 ; 
           [0012]      FIG. 3  is a longitudinal section of the locking part according to  FIGS. 1 and 2 ; 
           [0013]      FIG. 4  is a plan view of a receiving element of the fastening arrangement according to  FIG. 1 , looking in the direction of introduction of the locking part; 
           [0014]      FIG. 5  is a perspective view of the receiving element of the fastening arrangement according to  FIGS. 1 to 4 , looking at the side of the receiving element that is facing away in the insertion direction of the locking part; 
           [0015]      FIG. 6  is a perspective view of another exemplary embodiment of a receiving element of the fastening arrangement according to the invention; and 
           [0016]      FIG. 7  is a sectional view the exemplary embodiment of a fastening arrangement according to the invention as illustrated in  FIG. 6 , with a locking part inserted in the receiving element. 
       
    
    
       [0017]    Corresponding reference characters indicate corresponding parts throughout the several views. Although the exemplifications set out herein illustrate embodiments of the invention, in several forms, 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 
       [0018]      FIG. 1  is a perspective view of an exemplary embodiment of a fastening arrangement according to the invention for interconnecting at least two elements, in which exemplary embodiment a liner element  1 , for example a door liner for a motor vehicle, an add-on part  2  and a carrier part  3 , configured for example as a sheet-metal door panel, are to be interconnected. The exemplary fastening arrangement according to the invention illustrated in  FIG. 1  is provided with a liner retaining element  4  known per se, which can be connected to the liner element  1  via a fastening foot  5 . Liner retaining element  4  further comprises, disposed oppositely from the fastening foot  5 , a fastening head  6  that can be connected to a receiving head  7  belonging to a locking part  8  of the inventive fastening arrangement and made of a hard elastic synthetic material. Receiving head  7  in the exemplary embodiment is configured as hexagonal, so that, for example, it can be brought into form-locking engagement with a hexagonal wrench. 
         [0019]    Locking part  8  further comprises a disk-like head plate  9 , which is surrounded edgewise by a sealing lip  10  made of a soft elastic material. On the opposite side of head plate  9  from receiving head  7 , locking part  8  is equipped with a foot shaft  11  that extends away from head plate  9  in the axial direction. 
         [0020]    It can further be seen from  FIG. 1  that add-on part  2  is configured with a receiving element  12 , which is designed to receive the inventive fastening arrangement and in which, for one thing, there is provided an add-on part opening  13  through which the foot shaft  11  can be guided until head plate  9  rests against the side of add-on part  2  facing toward locking part  8 . Receiving element  12  further comprises a circumambient edge wall  14 , which is disposed at a distance from the edge of add-on part opening  13 . A bearing surface  15  oriented substantially parallel to add-on part  2  is configured in receiving element  12  between edge wall  14  and the edge of add-on part opening  13 . 
         [0021]    Finally, it can be seen from  FIG. 1  that carrier part  3  is configured with a substantially circular carrier part opening  16 , which is so dimensioned that foot shaft  11  can also be guided through carrier-part opening  16  to interconnect elements  1 ,  2 ,  3  in a manner explained in more detail below. 
         [0022]      FIG. 2  is a side view of the locking part  8  of the exemplary fastening arrangement according to  FIG. 1 . It is evident from  FIG. 2  that radially outwardly projecting bearing tenons  17 ,  18  are configured on diametrically opposite sides of the foot shaft  11 . It can further be seen from  FIG. 2  that spring webs  20 ,  21  are configured between the bearing tenons  17 ,  18  in the inwardly hollow foot shaft  11  by the formation of axially extending, spaced-apart longitudinal slits  19  and of transverse slits (not shown in  FIG. 2 ) in the region of head plate  9 , and are connected to foot shaft  11  in the region of a foot end  22  of foot shaft  11  that faces away from head plate  9 . The spring webs  20 ,  21  thus are resiliently movable in a radial direction relative to foot shaft  11 . 
         [0023]      FIG. 3  is a longitudinal section of the locking part  8  of the exemplary fastening arrangement according to  FIGS. 1 and 2 . It is apparent from  FIG. 3 , for one thing, that formed radially outwardly on head plate  9  is an edge shield  22  which is bent downward in the direction of foot shaft  11  and tapers radially toward the outside, and which is engaged with the sealing lip  10 . Sealing lip  10  can thus be moved in the axial direction within certain limits by bending edge shield  22 . 
         [0024]    It can further be seen from  FIG. 3  that each spring web  20 ,  21  is provided at its end facing toward head plate  9  with radially outwardly extending web wings  23 , which project beyond the outside of foot shaft  11 . Each spring web  20 ,  21  also comprises a catch nose  24 , which also projects in a radial direction beyond foot shaft  11 , and which is configured with a flat side, facing the head plate  9 , which in the proper arrangement of locking part  8  engages behind the back side of carrier element  3 , i.e., the opposite side from add-on part  2 . 
         [0025]    Finally, also discernible in  FIG. 3  are the transverse slits  25  mentioned in connection with  FIG. 2 , which are between the head plate  9  and the web wings  23 . 
         [0026]      FIG. 4  is a plan view of the add-on part  2  on receiving element  12 , looking in the insertion direction of locking part  8 . It can be seen from  FIG. 4  that the edge wall  14  comprises inwardly convex portions  26 ,  27  that are disposed diametrically opposite each other and bow inward radially, while outwardly concave portions  28 ,  29  extend between the inwardly convex portions  26 ,  27  toward the next-following regions of said inwardly convex portions  26 ,  27 . Finally, in the depiction of  FIG. 4 , configured in bearing surface  15  are diametrically opposite bearing-tenon apertures  30 ,  31 , which are so dimensioned that when locking part  8  is inserted, bearing tenons  17 ,  18  are able to pass unobstructed through add-on part opening  13 , while catch noses  24  slide along the edge of bearing surface  15 , deflecting spring webs  20 ,  21 . 
         [0027]      FIG. 5  is a perspective view of the receiving element  12  of the fastening arrangement according to the invention, looking at the side of add-on part  2  that is to the rear in the insertion direction of locking part  8 . It can be seen from  FIG. 5  that configured on the side of receiving element  12  facing away from bearing surface  15  is a curved path with, adjacent to bearing tenon apertures  30 ,  31 , mounting depressions  32 ,  33 , as first depressions in a direction of rotation, and, as second depressions of a profiled surface  36 , demounting depressions  35 ,  36 , spaced for example 90 degrees from mounting depressions  32 ,  33  in said direction of rotation. Mounting depressions  32 ,  33  and demounting depressions  34 ,  35  are configured on their edge sides facing away from each other with abutment walls  37 ,  38  oriented at right angles to the direction of rotation. By this means, after a single rotation of locking part  8 , said locking part  8  is held in receiving element  12  in a loss-proof manner. 
         [0028]    Inwardly convex portions  26 ,  27  are preferably aligned in the axial direction with demounting depressions  34 ,  35 , while outwardly concave portions  28 ,  29  are aligned in the axial direction with mounting depressions  32 ,  33 . Effective mounting is thus ensured. 
         [0029]    The manipulation of the inventive fastening arrangement according to  FIG. 1  will be explained below. 
         [0030]    After the fastening foot  5  of liner retaining element  4  has been brought into engagement with liner element  1 , fastening head  6  is inserted in the receiving head  7  of locking part  8 . Locking part  8  is then guided through add-on part opening  13 , deflecting the spring webs  20 ,  21  as described above in connection with  FIG. 4 , in such a way that bearing tenons  17 ,  18  pass through bearing-tenon apertures  30 ,  31 . Locking part  8  is then rotated, for example by means of a fork wrench engaged with receiving head  7 , such that bearing tenons  17 ,  18  are disposed in mounting depressions  32 ,  33  and web wings  23  are positioned in inwardly convex portions  26 ,  27 . In this mounting arrangement, locking part  8  is now pushed, together with add-on part  2 , through carrier-part opening  16  until, in this rearwardly engaged arrangement, the catch noses  24  engage, once spring webs  20 ,  21  have rebounded, behind the side of carrier part  3  facing away from add-on part  2  and elements  1 ,  2 ,  3  are henceforth interconnected. 
         [0031]    To effect demounting, that is, to separate carrier part  3  from add-on part  2 , after the removal of liner retaining element  4 , locking part  8  is rotated such that bearing tenons  17 ,  18  come to lie in demounting depressions  32 . In this demounting arrangement, the catch noses  24  are shifted radially inward so far by the action of inwardly convex portions  26 ,  27  on web wings  23 , accompanied by the inward bending of spring webs  20 ,  21 , that in this releasing arrangement, their rear engagement with carrier element  3  is released and they can therefore pass without engagement through carrier-element opening  16  against the direction of insertion. 
         [0032]    To effect remounting, locking part  8  is rotated backwards to return it to the mounted position, in which the bearing tenons  17 ,  18  lie in the mounting depressions  32 ,  33  and the catch noses  24  have rebounded. 
         [0033]      FIG. 6  is a perspective view of another exemplary embodiment of a receiving element  12  of a fastening arrangement according to the invention, it being noted that corresponding elements of the exemplary embodiment according to  FIGS. 1 to 5  and of the exemplary embodiment according to  FIG. 6  are provided with the same reference characters and will not be described in more detail below. It is apparent from  FIG. 6  that the fastening arrangement in this exemplary embodiment is provided with a circular, curved opening  39  extending for substantially 90 degrees, the center point of which lies in the center of receiving element  12  and thus in the center of add-on part opening  13 . 
         [0034]      FIG. 7  is a sectional view the exemplary embodiment of a fastening arrangement according to the invention as illustrated in  FIG. 6 , with a locking part  8  inserted in the receiving element  12 , it being noted that corresponding elements of the exemplary embodiment according to  FIGS. 1 to 5  and of the exemplary embodiment according to  FIGS. 6 and 7  are provided with the same reference characters and will not be described in more detail below. It can be seen from  FIG. 7  that locking part  8  is configured to comprise a covering shield  40  that is open in the direction of foot shaft  11 , and in the center region of which are configured two mutually parallel longitudinal ribs  41  directed away from foot shaft  11 , which bound a longitudinal slot  42  provided for engagement with the blade of a screwdriver not shown in  FIG. 7 . Also formed on the covering shield  40 , on the side facing toward foot shaft  11 , is a guide tenon  43 , which in the mounted position shown in  FIG. 7  engages in curved opening  39  and thus strikes the terminal edge of curved opening  39  upon reaching the end positions when moving between the demounted position and the mounted position. As a result, during movement between the demounted position and the mounted position, locking part  8  can be guided independently of the interaction of spring webs  20 ,  21  and receiving element  12 , and in a way that provides mechanical relief. 
         [0035]    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.