Abstract:
A positioning device for positioning an object which is to be glued onto a target surface. The positioning device has an attachment for temporarily or permanently attaching the positioning device to the target surface and an internal surface. The internal surface forms a guide for the object that defines a pre-mounting position and a final mounting position of the object. The object can be moved relative to the internal surface and as a result can be transferred from the pre-mounting position to the final mounting position. The internal surface is configured to enter at least partially into immediate, positively-locking contact with the object in order to guide the object. An arrangement having such a positioning device and an object to be glued and a method for glueing an object onto a target surface are also provided.

Description:
BACKGROUND 
       [0001]    The present invention relates to a positioning device for positioning an object to be glued to a surface. The invention also relates to an arrangement comprising a positioning device of this type and an object to be glued. The invention further relates to a method for gluing an object to a surface. 
         [0002]    It is known to use a positioning device to fix an object to be glued to a surface, for example a carrier element or support element or any other structural component, in place on the surface (also referred to in the following as the target surface) while the adhesive cures. For this purpose, the positioning device is first secured, for example stuck, to the surface, it being sufficient for this purpose to secure the device in a less durable and stable manner than is desired for securing the object to the target surface. Next or even beforehand, the object to be glued is mechanically coupled to the positioning device, for example inserted or clamped in the positioning device. Adhesive is applied to either a bonding surface of the object or a bonding surface of the target surface and the positioning device is activated to position the object relative to the target surface in such a way that the adhesive bonds the object to the target surface. In the following, this position of the object will also be referred to as the final mounting position. A different position that the object assumes beforehand, in which the object is at a distance from the target surface such that no adhesive bond can be produced between the object and the target surface, is also referred to as the pre-mounting position. Both the pre-mounting position and the final mounting position are defined relative to the positioning device. When the positioning device is positioned on the target surface, the two positions can also be defined relative to the target surface. When the object is in the pre-mounting position, it may be advantageous to apply the adhesive to the object or to the target surface, preferably prior to the positioning device being secured to the target surface. 
         [0003]    U.S. Pat. No. 7,294,385 B1 discloses a device for securing an object to a substrate. The device comprises an outer support element which is temporarily adhered to the substrate. The device further comprises an inner mount, into which the element to be glued is inserted. The inner mount can move relative to the outer support element. An inner surface of the outer support element and an outer surface of the inner mount are adapted to each other and act as a guide for the inner mount and thus for the element to be glued. The guide defines a pre-mounting position and a final mounting position for the inner mount. 
       SUMMARY 
       [0004]    The object of the invention is to disclose a positioning device that has a simple construction and entails low material costs. The object of the invention is also to disclose a method for gluing an object to a target surface, which method can be implemented using a positioning device that has a simple construction and low material costs. These objects are achieved by the features of the independent claims. 
         [0005]    The positioning device comprises attachment means for temporarily or permanently attaching the positioning device to the target surface, and an inner surface which forms a guide for the object. The object can, for example, be a retainer intended to be glued in a passenger compartment of an aircraft, for example to a support structure of the aircraft. Retainers of this type can be used, for example, to secure electric cables or cable clamps in the aircraft. The guide defines a pre-mounting position and a final mounting position of the object. The object can be displaced relative to the inner surface and thus can be moved from the pre-mounting position into the final mounting position. 
         [0006]    In order to guide object, the inner surface is designed to come into direct interlocking contact with the object at least in part. At least some parts of the inner surface are thus at least temporarily in direct contact with the object and define the pre-mounting position and final mounting position thereof. A movable mount for the object can thus be omitted. 
         [0007]    According to an advantageous embodiment, the shape of the inner surface for guiding the object is adapted to the external shape of the object. For example, the inner surface of the positioning device can comprise protrusions or recesses which each engage at least temporarily with complementary elements of the external shape of the object, for example only in the pre-mounting position or only in the final mounting position. Alternatively or additionally, however, the inner surface can also have a universal nature and be suitable for a plurality of different objects. For example, the inner surface can be flexible in order to adjust, to a certain degree, to the external shape of different objects. 
         [0008]    Since there is no need for a movable mount, the positioning device can be in a single piece, i.e. produced without parts which can move or pivot relative to one another. The device can thus be produced in a particularly simple manner, for example as a single-piece moulded part made of a suitable plastics material. 
         [0009]    According to an embodiment, the positioning device is resilient at least in part in order to allow the object to move from the pre-mounting position into the final mounting position by exerting a force on the object. When the positioning device is not deformed or is only slightly deformed, the inner surface can, for example, form a forwards catch which prevents the object from moving from the pre-mounting position into the final mounting position. By exerting an appropriate force, the positioning device can be resiliently deformed in such a way that the object overcomes the forwards catch and passes into the final mounting position. A backwards catch can also be provided, which prevents the object from moving backwards into the pre-mounting position. When passing from the pre-mounting position into the final mounting position, plastic deformations can also occur on the positioning device and/or the object. Depending on the design of the positioning device and/or of the object, plastic deformations can be intentional, for example to aid locking of the object in a desired position. In any case, it must be ensured that the object cannot easily leave the final mounting position. 
         [0010]    According to another embodiment, the positioning device comprises a movable element which allows the inner surface to expand and the object to move from the pre-mounting position into the final mounting position by exerting a force on the object. A movable element of this type may be particularly advantageous if the positioning device is not sufficiently resilient to allow the object to move from the pre-mounting position into the final mounting position as a result of plastic deformation of the positioning device. 
         [0011]    The inner surface can comprise at least one first protrusion which is designed to come into direct interlocking contact with the object at least in part, in order to cause the object to be locked in the pre-mounting position or to assist this locking. The protrusion can in particular assist in preventing the object from moving backwards, i.e. a movement which moves the object away from the final mounting position. It is possible to provide a plurality of such protrusions, for example two, three, four or more, which together provide the desired locking action. 
         [0012]    Furthermore, the inner surface can comprise at least one second protrusion which is designed to come into direct interlocking contact with the object at least in part, in order to cause the object to be locked in the final mounting position or to assist this locking. The one or more protrusions, for example two, three, four or more second protrusions, in particular either help to prevent or prevent the object from moving backwards out of the final mounting position. According to a particularly advantageous embodiment, said protrusions also act as a forwards catch when the object is in the pre-mounting position. 
         [0013]    The first protrusion or the second protrusion or both protrusions can, for example, be formed as snap-in hooks. A snap-in hook is a component or in this case a surface feature which allows a complementary element to the snap-in hook to slide along the snap-in hook, and prevents a movement in the opposite direction as soon as a “snap-in point” or “point of no return” has been passed. For example, a snap-in hook can be designed as an asymmetric lug. 
         [0014]    The second protrusion can comprise a holding surface which is at an angle relative to the target surface and pushes the object towards the target surface in the final mounting position. It is thus possible to generate a suitable contact pressure that pushes the object and the target surface together and thus promotes the formation of an adhesive bond between the object and the substrate. 
         [0015]    According to an embodiment, the first and/or the second protrusion are arranged on a movable element of the positioning device. In particular, the element can be a pivotable element. By moving, for example pivoting, the movable element, the forward blocking action of the first or second protrusion can be overcome in order to move the object into the pre-mounting position and further into the final mounting position. 
         [0016]    The object can comprise a plate which can be glued to the target surface. 
         [0017]    An adhesive, by means of which the plate can be bonded to the target surface, can be applied at least to a part of the gluable plate. 
         [0018]    The object can in particular be a retainer that comprises means for securing components in an aircraft, for example for securing internal cladding elements. 
         [0019]    The target surface can in particular be a surface of a structure in an aircraft. 
         [0020]    The method according to the invention for gluing an object to a target surface is carried out using a positioning device that comprises an inner surface which forms a guide for the object, the guide defining a pre-mounting position and a final mounting position of the object. The method comprises at least the following steps: applying adhesive to a gluing region of the target surface or to a gluing region of the object while the object is in the pre-mounting position; securing the positioning device to the target surface; moving the object from the pre-mounting position into the final mounting position by displacing the object relative to the inner surface, the inner surface coming into direct interlocking contact with the object at least in part; and curing the adhesive. The object is thus moved directly along the inner surface of the positioning device secured to the target surface. There is no need for a retaining device which is movable relative to the inner surface for retaining the object. The above method steps do not necessarily have to be carried out in the stated order. In particular, the adhesive can be applied at any time prior to the movement into the final mounting position. 
         [0021]    The positioning device can be removed once the adhesive has cured. Alternatively, however, it may also be advantageous to leave the positioning device on the target surface. On one hand, this eliminates the work of the removal and, on the other hand, depending on its design, the positioning device can have a certain mechanical protective action for the adhesive joint, for example in the manner of a shield. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0022]    The invention will be described in more detail below on the basis of embodiments and with reference to the accompanying drawings. In the process, like reference numerals denote like or similar components. 
           [0023]    In the drawings: 
           [0024]      FIG. 1  is a cross section through a positioning device; 
           [0025]      FIG. 2  is a view of a detail of  FIG. 1 ; 
           [0026]      FIG. 3  is a plan view of the positioning device; 
           [0027]      FIG. 4  is a cross section through the positioning device; 
           [0028]      FIG. 5  is a view of a detail of  FIG. 4 ; 
           [0029]      FIG. 6  is a plan view of the positioning device; 
           [0030]      FIG. 7  is a perspective view of the positioning device; 
           [0031]      FIG. 8  is a perspective view of the positioning device together with an object to be positioned; 
           [0032]      FIG. 9  is a cross section through a part of a positioning device according to another example, in the pre-mounting position; 
           [0033]      FIG. 10  is a cross section through a part of the positioning device of  FIG. 9  in the final mounting position; 
           [0034]      FIG. 11  is a perspective view of a part of the positioning device of  FIGS. 9 and 10 ; 
           [0035]      FIG. 12  is a cross section through a part of a positioning device according to another example, in the pre-mounting position; 
           [0036]      FIG. 13  is a cross section through a part of the positioning device of  FIG. 12  in the final mounting position; 
           [0037]      FIG. 14  is a perspective view of a part of an object to be positioned; 
           [0038]      FIG. 15  is a perspective view of a part of the positioning device of  FIGS. 12 and 13 ; 
           [0039]      FIG. 16  is a cross section through a part of the positioning device according to another example, in the pre-mounting position; 
           [0040]      FIG. 17  is a cross section through a part of the positioning device of  FIG. 16  in the final mounting position; 
           [0041]      FIG. 18  is a partial perspective view of the positioning device of  FIGS. 16 and 17 ; 
           [0042]      FIG. 19  is a cross section through a part of the positioning device according to another example, in the pre-mounting position; 
           [0043]      FIG. 20  is a cross section through a part of the positioning device of  FIG. 19  in the final mounting position; 
           [0044]      FIG. 21  is a partial perspective view of the positioning device of  FIGS. 19 and 20 ; 
           [0045]      FIG. 22  is a partial perspective view of the object which is positioned using the positioning device of  FIGS. 19 to 22 ; 
           [0046]      FIG. 23  is a partial sectional view of a positioning device together with an object; 
           [0047]      FIG. 24  is a partial sectional view of an example positioning device together with an object; 
           [0048]      FIG. 25  is a partial sectional view of an example positioning device together with an object; 
           [0049]      FIG. 26  is a partial perspective view of an example of an object to be glued. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0050]      FIGS. 1 to 6  are various views of an example of a first embodiment of a positioning device  10  and of an arrangement comprising an object  12  to be glued to a target surface  19 , in different mounting positions. The object  12  can be a retainer to be glued in an aircraft, for example. In the example shown, the target surface  19  is a surface of a carrier or substrate  18 . The substrate  18  can be a covering wall or a side wall of an aircraft, for example. In the example shown, the target surface  19  is planar, although the invention described here can also be applied to non-planar target surfaces (not shown). 
         [0051]    For example, the object  12  comprises a base  14  and a main plate  16 . The object  12  comprises a surface  24  which is intended to be glued to the surface  19  of the substrate  18 . In the example shown here, this is achieved by applying an adhesive layer  20 , which for example is formed by liquid adhesive which cures following application. The adhesive layer  20  can be applied to the target surface prior to the object  12  being secured. Alternatively or additionally, an adhesive layer can be applied to the surface  24  of the object  12  before the object  12  is secured (not shown). In the example shown, the surface  24  is the underside of the plate  16 . 
         [0052]    The positioning device  10  comprises securing means  26 ,  28  which allow the positioning device  12  to be temporarily or permanently secured to the target surface  19 . In the example shown, the securing means are formed by two plates  28  of the positioning device  10 , for example by side plates which are secured to the target surface  19  by means of adhesive strips  26 . The adhesive strips  26  are preferably attached to the positioning device  10  (to the side plates  28  in the example shown) when the positioning device  10  is in a delivery state. Alternatively, however, the adhesive strips  26  can also be applied to the target surface  19  before the positioning device  10  is placed thereon. In this case, the adhesive strips  26  are also used for marking the intended position for the positioning device on the target surface  19 . In another example, the securing means comprise a magnet apparatus. The magnet apparatus can be formed by permanent magnets or electromagnets. The use of electromagnets allows the positioning device  12  to be detached from the substrate  18  in a simple manner by switching off the electromagnets. However, in order to use magnets, the substrate  18  has to be either ferromagnetic at least at some points or rigidly connected to a ferromagnetic material. In many cases in practice, the substrate  18  is not ferromagnetic. 
         [0053]    The positioning device  12  comprises an inner surface  32  which defines a guide path for the object  12 . In the example shown, the inner surface  32  is the inner surface of a wall  30 , which can for example be designed as a frame  31  which surrounds at least part of the object  12 . The inner surface is not necessarily one continuous surface, but rather can be assembled from separate surface portions. The guide path for the object  12 , as defined by the inner surface, has a pre-mounting position (see  FIGS. 1 to 3 ) and a final mounting position (see  FIGS. 4 to 6 ). The object  12  is displaceable on the guide path relative to the inner surface  32  and can thus be moved from the pre-mounting position into the final mounting position. The guide path described here is not a physical component, but rather a series of permitted positions (points) of the object  12  relative to the inner surface  32 . 
         [0054]    The object is guided by the inner surface coming into direct interlocking contact with the object  12  at least in part. The inner surface  32  thus restricts the mobility of the object  12  and only allows the object  12  to move along the guide path. In the examples shown, the guide path only has two firm positions for the object  12 , i.e. the pre-mounting position (see for example  FIGS. 1 to 3 ) and the final mounting position (see for example  FIGS. 4 to 6 ). The design of the inner surface  32  for directly guiding the object  12  is advantageous in that there is no need for a retainer that can move relative to the inner surface  32  for retaining the object  12 . In the solution described here, the object  12  mechanically interacts directly with the positioning device  10  that is to be rigidly secured with respect to the substrate  18 , without the need for a movable component of the positioning device  10  to move the object  12  from the pre-mounting position into the final mounting position. 
         [0055]    In the example shown, the inner surface  32  comprises at least two first protrusions  34  and at least two second protrusions  36 . The protrusions  34  and  36  define the pre-mounting position and the final mounting position of the object  12 . 
         [0056]    If the object  12  is in its pre-mounting position (see  FIGS. 1 to 3 ), the first protrusions  34  work together as a backwards catch and thus counteract a hypothetical movement of the object  12  away from the target surface  19  (upwards in  FIGS. 1 and 2 ). The second protrusions  36  on the other hand act as a forwards catch and thus counteract a hypothetical movement of the object  12  towards the target surface  19 . In this setup in the example shown, the plate  16  of the object  12  extends in a gap  38  formed between each first protrusion  34  and an adjacent second protrusion  36 . The plate  16  and also the entire object  12  are thus locked. 
         [0057]    When the object  12  is in its final mounting position (see  FIGS. 4 to 6 ), the first protrusions  34  no longer interact with the object  12 . By contrast, the second protrusions  36  now act as a backwards catch and thus counteract a hypothetical movement of the object  12  away from the target surface  19  (upwards in  FIGS. 4 and 5 ). In this setup, the plate  16  of the object  12  extends between the second protrusions  36  and the target surface  19  of the substrate  18  and is thus locked. 
         [0058]    By generating a forward force between the positioning device  10  and the object  12 , the object  12  can be moved from the pre-mounting position (see  FIGS. 1 to 3 ) into the final mounting position (see  FIGS. 4 to 6 ). In this example shown, this is achieved by taking advantage of the resilience of the wall  30 . When the object  12  moves forwards (downwards in  FIGS. 1, 2, 4 and 5 ), the wall  30  is slightly expanded or bent outwards, and so the second protrusions  36  lose their forwards blocking action. The plate  16  then snaps into the gaps formed between the second protrusions  36  and the target surface  19  and is locked thereby. 
         [0059]    The second protrusions  36  each comprise a retaining surface  37  which is at an angle to the target surface  19 . The result of the angular design is that, when in the final mounting position (see  FIGS. 4 to 6 ), the plate  16  is pushed against the target surface  19  by the second protrusions owing to the resilience of the device  10 . Alternatively, however, it is also conceivable to design the second protrusions  36  such that the retaining surface extends in parallel with the target surface and does not produce any significant contact force. It should be noted that, depending on the adhesive used, it may or may not be necessary to press together the surfaces to be glued. 
         [0060]      FIGS. 7 and 8  show an example of an embodiment in which the first protrusions  34  and the second protrusions  36  are each formed as clips. Two first protrusions  34  formed as clips (first clips  34 ) are arranged opposite one another at a first height on the inner wall  32 . Four second protrusions  36  formed as clips (second clips  36 ) are arranged at a second height on the inner wall  32 . Here, the term “height” denotes the distance from the target surface  19  (not shown in  FIGS. 7 and 8 ). Each individual clip  34  or  36  can, for example, be formed as an elongate, resilient tab which extends substantially in parallel in the forward direction (i.e. towards the target surface) from a particular bottom point of the wall  30  and has a thickened top end. This design allows the clips to be sufficiently flexible, even when a relatively rigid material is used. 
         [0061]      FIGS. 9 to 11  show an example of another embodiment of a positioning device  10 . The wall  30  comprises a movable element  40 , on which at least one first protrusion  34  and a second protrusion  36  are formed. In this example, the movable element  40  can pivot within a limited angular range about a pivot axis  42  parallel to the target surface  19 . The maximum pivot angle can, for example, be between 1° and 2°, or between 2° and 5°, or between 5° and 10°. Alternatively, the movable element  40  can be formed integrally with the rest of the wall  30 . In this case, the pivot axis  42  is replaced by a flexible connecting piece (not shown) which integrally joins the movable element to the rest of the wall  30 . 
         [0062]    If the object is not yet in its final mounting position, the movable object  12  is pivoted (by virtue of the plate  16  in this example) into the unlocked position (indicated by the dashed outline in  FIGS. 9 and 10 ) by generating a forward force between the object  12  and the device  10 . In the unlocked position, the protrusions  34  and  36  do not counteract a forward movement of the object  12 , and so the object  12  can first be moved into the pre-mounting position (see  FIG. 9 ) and subsequently into the final mounting position (see  FIG. 10 ). During this forward movement, the object slides on the suitably angled sliding surfaces of the protrusions  34  or  36 . In the example shown, the movable element  40  can also be unlocked, for example manually, by external actuation, namely by pressing on a lever region  44 . 
         [0063]    In the example shown in  FIGS. 12 to 15  of another embodiment, the protrusions  34  and  36  on the inner wall  32  are no longer produced as such. The inner wall  32  comprises a first recess  52  and a second recess  54 . For example, the recesses  52  and  54  can each be designed as a groove extending in parallel with the target surface  19 . In the pre-mounting position (see  FIG. 12 ), a locking element  46  of the object  12  extends into the first recess  52  and as a result locks the object  12  with respect to the device  10  and thus with respect to the target surface  19 . In the final mounting position (see  FIG. 13 ), the locking element  46  of the object  12  extends into the second recess  54  and as a result locks the object  12  with respect to the device  10  and thus with respect to the target surface  19 . By exerting a forward force, the object  12  is moved from the pre-mounting position into the final mounting position. The object  12  also comprises a rail  48  (see  FIG. 14 ) which extends perpendicularly to the target surface  19 , is engaged with a complementary rail  56  (see  FIG. 15 ) and restricts the permitted movement of the object  12  to a linear movement along the rails  48 ,  56 . In this example, the side plate  28  of the positioning device  10  comprises a portion  50  which leads away from the target plane  19  in a U-shape (U-shaped portion). The wall  30  is formed at least in part by one of the two leg regions of the U-shaped portion  50 . 
         [0064]      FIGS. 16 to 18  show an example of an embodiment in which the first protrusions  34  (in this example, four first protrusions  34  formed as tab heads) and the second protrusions  36  (in this example, two second protrusions  36  formed as tab heads) are arranged on portions of the inner surface  32  that have different orientations. A structure of this type can be particularly advantageous over an arrangement in which each second protrusion  36  is arranged below a first protrusion  34 , since the entire height of the inner surface is thus available for an individual protrusion  34  or  36 . 
         [0065]      FIGS. 19 to 22  show an example of another embodiment. In this example, the wall  30  comprises a resilient, substantially L-shaped element  58 , the shorter leg  60  of which is designed to lock the object  12  in the pre-mounting position. The leg  60  comprises an end face which is jagged or is provided with at least one protrusion or recess and which faces the object  12  and is engaged therewith (by means of the plate  16  in this example) while the object  12  is in its pre-mounting position (see  FIG. 19 ). By a forward force being exerted on the object  12 , the L-shaped element  58  is spread outwards, i.e. counter to the surface normal vector of the inner surface  32 , in order to open the path for the object. The object can thus be moved into its final mounting position (see  FIG. 20 ). Once the final mounting position is reached, the tension is released in the L-shaped element  60  and said element moves back into its initial position. In the process, the element acts as a backwards catch and thus locks the object  12  in the final mounting position on the substrate  18 . A contact pressure is not necessarily produced in the process. This embodiment is distinguished in particular in that the object  12  is locked in the final mounting position without the wall  30  used for this purpose extending as far as the target surface. Therefore, there is a relatively low risk of the wall  30  coming into contact with adhesive applied to the target surface  19  and thus of the guidance of the object  12  being impeded. Contact of this type with the adhesive could lead to the wall  30  and thus the inner surface  32  thereof losing mobility, and so in some circumstances the object  12  may not be moved into the final mounting position. 
         [0066]      FIG. 23  shows a variant of the embodiment described with reference to  FIGS. 1 to 6 . In this variant, the object  12  comprises a cavity  62 , for example a hole or depression, on its surface  24  to be glued. Advantageously, the cavity  62  is arranged in an edge region of the surface  24 . The cavity  62  is used to collect adhesive  20  when the object is in the final mounting position, as shown. Once the final mounting position has been reached, some of the adhesive  20  can be pushed outwards between the object  12  and the target surface  19  and as a result reaches a free region of the target surface  19  that is not to be glued. By providing the cavity  62 , the amount of adhesive thus released can be reduced. Therefore, the risk of adhesive accidentally reaching surfaces that are not to be glued, for example parts of the positioning device, is also reduced. 
         [0067]    In the variant according to  FIG. 24 , the cavity  62  is formed in a lower edge of the object  12 , for example by bevelling or rounding the edge. In this case, the cavity  62  is open outwards. 
         [0068]      FIG. 25  shows another variant. In this example, the cavity  62  for collecting adhesive  20  is a spatial region between a lug  64  of the object  12  and the target surface  19 . 
         [0069]    In the example shown in  FIG. 26 , the plate  16  of the object  12  is provided, on its outer periphery or at least on portions of its outer periphery, with adhesive guides  66  that extend perpendicularly to the target surface  19 . As a result, a capillary effect can be produced on the adhesive. Depending on the viscosity of the adhesive, excess adhesive is thus guided away upwards, i.e. away from the target surface. For example, the adhesive guides  66  can be formed as grooves, flutes or channels. Said guides should be narrow by comparison with the outer circumference of the plate  16 . Advantageously, they each comprise an inner edge that is as sharp as possible. 
         [0070]    Wherever used, spatial information such as up, down, above, below, right, left, etc. is to be understood as information which merely describes the arrangement of elements relative to one another. The term “a plurality” means “at least two”. 
         [0071]    The features of the invention disclosed in the above description, in the drawings and in the claims can be essential to the implementation of the invention both in isolation and in any given combination. 
       LIST OF REFERENCE NUMERALS 
       [0000]    
       
           10  Positioning device 
           12  Object 
           14  Base 
           16  Plate 
           18  Substrate 
           19  Target surface 
           20  Adhesive 
           22  Surface 
           24  Surface 
           26  Adhesive strips 
           28  Plate 
           30  Wall 
           31  Frame 
           32  Inner surface 
           34  First protrusion 
           36  Second protrusion 
           37  Retaining surface 
           38  Gap 
           40  Movable element 
           42  Pivot axis 
           44  Lever region 
           46  Locking element 
           48  Rail 
           50  U-shaped portion 
           52  First recess 
           54  Second recess 
           56  Rail 
           58  L-shaped element 
           60  Leg 
           62  Cavity 
           64  Lug 
           66  Adhesive guide