Patent Publication Number: US-10308417-B2

Title: Package convertible into a frame

Description:
The invention relates to a package convertible into a frame, which can be converted from a package state into a frame state. 
     From DE 10 2011 115 255 B3 a box for a puzzle is known consisting of a lower part and a lid, each having a base plate and several side walls forming an inner space. A puzzle arrangement frame having the dimensions of the completed puzzle and consisting of several frame parts is arranged on the base plate. The frame parts are movably arranged on the base plate and foldable from a position in which they protrude into the inner space to a position in which the completed puzzle is fixed. 
     The known box requires a relatively high amount of material, since the base area of the base plate is considerably larger than the size of the completed puzzle. Due to the large base area the box requires a large amount of space. This is cumbersome when the box is to be stowed away in a cupboard or on a shelf. Finally, the foldability of the frame parts increases the constructive complexity of the known box. 
     The task underlying the invention is to provide a package convertible into a frame which can be manufactured from a small amount of material, requires little space and can easily be converted from a package state into a frame state. 
     The task is solved in accordance with the invention by a package convertible into a frame having the features of claim  1 . Advantageous developments of the inventive package are the subject of claims  2  to  14 . 
     In the inventive package a support plate and a lid element are arranged in parallel to each other on the frame element congruently above each other in the package state, each forming a flat—that is, stepless—top side and bottom side of the package. The base area of the package is thus determined only by the size of the support plate, respectively the lid element. When the package is used to store a puzzle, for instance, the puzzle pieces can be stored in the space between the support plate and the lid element. The package can also be used for other purposes such as the storage of crayon drawings, a game board or the like. 
     The main technical task to be solved by the invention is a saving in material in the manufacture of the package, since essentially all sides of the package are formed by elements that can be used in the frame after the package has been converted into the frame. 
     The amount of material required for manufacturing the package is thus small. Moreover the package can be easily converted from the package state into the frame state and vice versa. 
     In the most preferred embodiment the profile of the upper wall of the frame element abutting on the upper edge of the outer wall of the frame element is formed with at least one step with an upper and a lower leg, wherein the upper leg is arranged closer to the outer wall of the frame element than the lower. The arrangement of the lid element on the lower leg of the step makes it possible to use the lid element as one of the sides of the package, which is formed as a parallelepiped. Due to the formation of the steps in identical profile for all four sides of the frame element, firstly a decorative element is formed which makes the frame more attractive, secondly the recession formed thereby and limited by the step is used to arrange the lid element therein, whereby the vertical dimension of the package is reduced. The lid element can be received in this recession under tension, which makes it possible to dispense with the usage of a retaining element for a fixation of the lid element in the recession formed by the step in the profile of the upper wall of the frame element in the package state. 
     Preferably the thickness of the lid element is equal to the height of the step, which facilitates a stepless, that is, plane formation of the surface formed by the lid element and the upper wall of the frame element, which in its turn renders the storage and unhindered shifting of the package in the horizontal plane easier. 
     The formation of a side wall at the circumference of the rear surface of the support plate facilitates an effective enlargement of the interior space of the package by an arrangement of the support plate with its front surface to the outside in the package state, thus increasing the distance between the support plate and the lid element in the package state by an additional distance corresponding to the height of the side wall. For a conversion of the package into the frame state, in this embodiment it is only required to turn the support plate around, arranging its front surface on the side of the upper wall of the frame element, respectively letting the outer surface of the sidewall abut on the inside of the lower edge of the outer wall of the frame element. 
     Preferably on the inside of each of the four outer walls of the frame element at least one support element with a support surface is formed, which protrudes from the lower edge of the outer wall by the height of the side wall of the support plate. In this case the side wall abuts on the support surface of the support element in the package state, so that the front surface of the support plate is arranged flush with the face of the lower edge of the outer wall of the frame element. These support elements determine the position of the support plate in the frame element surrounding it at its circumference. Most preferred is an embodiment of at least two protrusions on each of the insides of the outer walls of the frame element, simultaneously preventing a bending deformation of the support plate inserted into the frame element. For greater stability it is preferred to arrange the position of the support plate in the frame element on the inner surface of the corners of the frame element and to arrange at least one protrusion respectively in the centre of each of the four sides of the frame element. 
     A frame element whose upper wall comprises on its inside an arc-shaped end portion with an edge portion arranged in parallel to the outer wall has the highest practical and aesthetic value. The arrangement of the face of the edge portion of the upper wall of the frame element in the same plane as the support surface of the support element makes it possible to enlarge the contact area of the front surface of the support plate and the elements of the inside of the frame element, facilitating a more stable positioning of the support plate in the frame element as well as a reliable fixation of the lid element in the case of its arrangement between the support plate and the frame element. 
     In a preferred embodiment the support plate is formed semi-transparent, with a surface allowing diffuse light transmission, or completely transparent. This facilitates an illumination of the package in the frame state from behind. If the support plate is formed completely transparent, the content of the package can be seen through the support plate, or the support plate can be used as a transparent protective layer in this case if the lid element with the image attached on it is arranged on the rear surface of the support plate in the frame state. 
     The support plate can be formed either continuously or with a multitude of apertures or with a multitude of recessions or as a rigid grid with meshes of predetermined size, which greatly enlarges the scope of usage of the package. For instance, the multitude of apertures distributed on the entire surface of the support plate can be used for assembling a mosaic, the pieces of which require apertures for their assembly on the support plate. The package can also be used for assembling a 3D puzzle made on the horizontal surface of the support plate. The apertures or recesses distributed on the entire surface of the support plate make it possible to attach a 3D puzzle on a vertical surface, creating spatial or combined models or combined images. The apertures or recessions in the support plate can also be used for an even storage of some objects, as it is done with the arrangement of chocolates in a chocolate box on a special basis serving as a kind of storage organisation element. The manufacturing of the support plate as a rigid grid or with apertures arranged on the entire surface can serve to diminish its weight. Thus the manufacturing costs for the inventive package are reduced. 
     Preferably the lid element and the frame element and the support plate are held in their position in the package state by at least one fixing element. 
     In one embodiment the fixing element comprises two cover portions arranged at a distance above each other with two lateral edges extending at a right angle towards each other. The cover portions are connected by a side wall extending perpendicularly to them in the area of the lateral edges. The fixing elements are slid onto the opposite corners of the package in the package state. 
     The fixing element can also be formed as at least two clamps holding the elements together in the package state. 
     Alternatively the fixing element can be formed as one or several turnbuckles, drawing together the support plate and the lid element and extending through the cavity of the package formed between the support plate, the frame element and the lid element. 
     Another possible embodiment of the fixing element is a cardboard envelope completely surrounding the side of the package formed by the lid element and in its folded state surrounding only the edge of the support plate at its circumference with a band having a width of three to twenty percent of the width of the support plate, that is, of the distance between the opposite longitudinal sides. Preferably the width of the band amounts to four to ten percent of the width of the support plate. If the support plate is transparent, this embodiment of the fixing element enables a view on the contained package through the transparent support plate, maintaining the parallelepiped shape of the package. 
     If the frame element is formed in such a way that its outer wall can be fastened under tension to the lateral edges of the support plate in the package state as well as in the frame state, the use of the fixing element to fasten at least the support plate on the frame element is not necessary, while if the lid element is formed in such a way that by fastening its lateral sides under tension it can be fastened in the recess formed by the step in the profile of the upper wall of the frame element, the use of the fixing element for fastening also the lid element in the recess of the frame element is not necessary. Nevertheless a fixing element can be used in the package state also in the case of a fastening of the support plate or the lid element in the frame element under tension in order to achieve a higher degree of reliability of the fastening of the lid element, the frame element and the support plate. 
     Preferably the support plate comprises several apertures arranged at a distance from each other adjacent to the circumference. The frame element comprises protrusions formed so that they engage with the apertures in the frame state and in the package state. Thus a secure grip of the frame elements in the frame state as well as in the package state is ensured. 
     This secure grip can be further improved by at least partial coverage of the inner surface of the apertures with an elastic material having a thickness that enables a retention of the protrusions of the frame elements under tension. 
     To obtain a visually attractive continuous frame, the length of the transverse legs of the frame element between the corresponding corners of the legs limiting them essentially corresponds to the length of the transverse side of the support plate, and the length of the longitudinal legs of the frame element between the corresponding corners of the legs limiting them essentially corresponds to the length of the longitudinal side of the support plate. 
    
    
     
       Embodiments of the invention will be explained in more detail based on the drawings, in which: 
         FIG. 1  shows a perspective view of a package convertible into a frame with elements arranged at a spatial distance to each other in the package state, 
         FIG. 2  shows a perspective view of a package convertible into a frame with fixing elements arranged at a distance from the package, 
         FIG. 3  shows the arrangement of parts in the package state in section A-A of  FIG. 2 , 
         FIG. 4  shows a further possible embodiment of the support element of the package in section A-A of  FIG. 2 , 
         FIG. 5  shows a perspective view of the first embodiment of the package convertible into a frame in the frame state, 
         FIG. 6 a    shows the arrangement of the parts in the frame state in section B-B of  FIG. 5 , 
         FIG. 6 b    shows the arrangement of the parts in the frame state in section C-C of  FIG. 5 , 
         FIG. 7  shows a perspective view of a second embodiment of the package in the frame state with elements arranged at a spatial distance to each other, 
         FIG. 8  shows a view of the package in the frame state according to the second embodiment in section C-C of  FIG. 7  (rotated), 
         FIG. 9  shows a third embodiment of the frame in perspective, 
         FIG. 10  shows the arrangement of the elements in the package according to the third embodiment in the frame state in section D-D of  FIG. 9  (rotated), 
         FIG. 11  shows a perspective view of a fourth embodiment of the package in the frame state with elements arranged at a spatial distance to each other, 
         FIG. 12  shows a view of the package in the frame state according to the fourth embodiment in section E-E of  FIG. 11 . 
     
    
    
       FIG. 1  shows a perspective view of a preferred embodiment of the package  10  with elements arranged at a spatial distance to each other. The package  10  comprises a flat rectangular support plate  11  with a side wall  18  arranged at its circumference, a frame element  19  and a rectangular lid element  60 , wherein in the package state the lid element  60  and the support plate  11  are arranged at a spatial distance from each other on a frame element  19  congruently above each other and parallel to each other, wherein the frame element  19  serves as a spacer keeping the lid element  60  and the support plate  11  at a predetermined distance to one another without their abutting in the package state. 
     The support plate  11  consists of transparent material and comprises two opposite longitudinal sides  13 ,  14  and two opposite transverse sides  15 ,  16  extending perpendicularly to them. The support plate  11  comprises a front side  70  and a rear side  72  (see  FIGS. 3, 4, 6   a ,  6   b ,  8 ,  10 ,  12 ), wherein the front side  70  of the support plate  11  is situated at the bottom in  FIG. 1  and the rear side  72  faces upwards. Alternatively the support plate  11  can be formed either continuous and non-transparent or with a multitude of apertures or as a rigid grid with meshes of predetermined size. It is important that the support plate  11  is sufficiently rigid to maintain its shape during the mounting and dismounting of the frame element  19  and not bend in the package state under the impact of stresses that are usual for functional packages. On each of the lateral sides  13 ,  14 ,  15 ,  16  of the support plate  11  on its rear surface  72 , i.e. in  FIG. 1  on the side facing the frame element  19 , a continuous side wall  18  is formed, wherein in a section through a plane extending in parallel to the support plate  11  the distance between the outer edges of the opposite walls  18  is constant in its entire height. 
     Alternatively (not shown in  FIG. 1 ) the wall  18  can be formed discontinuously or as individual protrusions. 
     The frame element  19  is positioned between the support plate  11  and the lid element  60  parallel to them. 
     The frame element  19  comprises longitudinal sides  23 ,  24  and transverse sides  25 ,  26  extending at a right angle towards each other. The length of the longitudinal sides  23 ,  24  essentially corresponds to the length of the longitudinal sides  13  and  14 , respectively, of the support plate  11 , while the length of the transverse sides  25 ,  26  corresponds to the length of the transverse sides  15  and  16 , respectively, of the support plate  11 . 
     The frame element  19  comprises a surrounding outer wall  40  forming the outside of the frame element  19 . The outer wall  40  comprises a lower edge  43  and an upper edge  44 , wherein in the package state the support plate  11  is arranged in the frame element  19  on the side of the lower edge  43 , while the lid element  60  is arranged on the side of the upper edge  44  of the upper wall  40  of the frame element  19 . At the upper edge  44  on the inside of the frame element  19  the upper wall  42  of the frame element  19  abuts, the outer circumference of which is formed identically along each of the longitudinal and transverse sides  23 ,  24 ,  25  and  26  of the frame element  19 . The cross profile of the upper wall  42  of the frame element  19  is formed with a step  80  with an upper leg  82  and a lower leg  81  (see  FIG. 3  and  FIG. 4 ). The step  80  is formed with uniform height and at a uniform distance from the outer wall  40  along the entire length of the longitudinal and transverse sides  23 ,  24 ,  25 ,  26  of the frame element  19 . Starting at the lower leg  81  the upper wall  42  extends in an arc shape downwards, that is, in the direction from the upper edge to the lower edge of the outer wall  40  of the frame element  19  to the inside, with an edge portion  41  extending parallel to the outer wall  40 , the lower edge of which extends parallel to the lower edge of the outer wall  40  and ends above it relative to the plane of the frame element  19 , as shown in  FIG. 3  and  FIG. 4 . Thus on the bottom side of the frame element  19  a tub-shaped recess is formed. Support elements  29  are attached at the bottom of this tub-shaped recess at regular intervals along each of the sides  23 ,  24 ,  25 ,  26  as separating walls in the tub-shaped recesses, their support surface  45  extending perpendicularly to the outer wall  40 . The support surface  45  of the support elements  29  serves for the arrangement of the face of the side wall  18  of the support plate  11  thereon in the package state. The support surface  45  protrudes from the lower edge  43  of the outer wall  40  by the height of the wall  18  so that when the wall  18  abuts on the support surface  45  of the support element  29  in the package state the front surface  70  of the support plate  11  is arranged flush with the face of the lower edge  43  of the outer wall  40 . Thus it is possible to form one of the surfaces of the package formed by the support plate  11  and the face of the lower edge  43  of the outer wall  40  of the frame element  19  as a plane surface without steps. 
     Instead of the embodiment of the support element  29  as a continuous separating wall in a tub-shaped recess as shown in  FIG. 3 , the support element  29  can be formed on the rear side of the outer wall  40  as a protrusion with a section plane that is triangular in longitudinal section, the support surface  45  of which lies in the same plane as the face  47  of the inner edge portion  41  of the upper wall  42 , as shown in  FIG. 4 . The support surface  45  extends from the inner surface of the outer wall  40  of the frame element  19  into the inside of the frame element  19  at a distance corresponding to the thickness of the side wall  18  of the support plate  11 . This embodiment of the support element  29  facilitates a further saving in the material of which the frame element  19  consists. 
     As shown in  FIG. 3  and  FIG. 4 , in the package state the outside of the side wall  18  of the support plate  11  abuts tightly on the lower part of the inside of the outer wall  40  of the frame element  19 , while the lower part is adjacent to the lower edge  43  of the outer wall  40 . This makes it possible to fasten the outer wall  40  of the frame element  19  under tension on the lateral sides  13 ,  14 ,  15 ,  16 , respectively on the side wall  18  of the support plate  11 . 
     The rectangular lid element  60  is formed continuously and non-transparent with a sufficient degree of rigidity to withstand bending deformation when used as one of the sides of the package as shown in  FIG. 1 . Typical forces in the field of use of the package are, for instance, forces caused by gripping movements of the fingers of the hand when the package is gripped with the fingers from two sides. The length of the lid element  60  corresponds to the length of the step  80  of the profile of the upper wall  42  of the frame element  19  on its longitudinal sides  23 ,  24 ; correspondingly, its width corresponds to the length of the step  80  on its transverse sides  25 ,  26 . This makes it possible to arrange the lid element  60  on the lower leg  81  of the step  80 . As shown in  FIG. 3  and  FIG. 4 , the thickness of the lid element  60  equals the height of the step  80 , which facilitates a stepless formation of the side of the package formed by the lid element  60  and the upper leg of the step  80 , wherein the surface of the lid element  60  that faces outwards is arranged flush with the upper leg  82  of the step  80 . Alternatively the thickness of the lid element  60  can differ from the height of the step  80 . Preferably that difference is not more than 30% of the height of the step  80  (not shown). If necessary, in accordance with an embodiment of the invention the lid element  60  is formed in such a way that it can be fastened in the recess formed by the step  80  of the profile of the outside of the upper wall  42  of the frame element  19 , by fastening its lateral sides under tension, to avoid the use of additional elements for fastening the lid element  60  on the frame element  19 . According to a further embodiment of the package shown in  FIG. 1 , the dimension of the lid element  60  corresponds to the outer dimension of the outer wall  40  of the frame element  19 . According to this embodiment of the package, however, the use of at least one of the embodiments of the fixing elements listed below is required. 
       FIG. 2  shows the package  10  in reverse view with respect to  FIG. 1 , so that the support plate  11  is positioned at the top while the lid element  60  (not shown in  FIG. 2 ) is at the bottom. One of the possible versions of holding the support plate  11 , the frame element  19  and the lid element  60  together is shown in  FIG. 2 , in which the package elements are held together by two fixing elements  30 ,  38 , shown in  FIG. 2  in a position before being put on the corresponding opposite corners of the package  10 . 
     Each fixing element  30 ,  38  comprises two equally sized cover portions  31 ,  32  arranged congruently above each other and shaped as a rectangular triangle with an apex  36 , from which two lateral edges  33 ,  34  extend at a right angle towards each other. The lateral edges  33 ,  34  of the upper cover portion  33  and the lower cover portion  32  are connected by a side wall  35  extending perpendicularly to the cover portions  31 ,  32 . In the area of the hypotenuse of the cover portions  31 ,  32  there is no side wall. The distance between the cover portions  31 ,  32  corresponds to the distance between the lid element  60  and the support plate  11  in the package state shown in  FIG. 2 . The fixing elements  30 ,  38  are put on opposite corners of the package  10 . 
     Alongside the use of the fixing elements  30 ,  38  shown in  FIG. 2 , other embodiments of the fixing elements are also possible. For instance, the fixing elements can be formed as two clamps (not shown) holding the lid element  60 , the frame element  19  and the support plate  11  in the package state. Alternatively the above-mentioned package elements can be held together by gluing on flat self-adhesive elements on adjacent portions of the support plate and the frame element, respectively of the lid element and the frame element (not shown). Alternatively the fixing element can be formed as a turnbuckle extending through the cavity of the package in the package state, connecting the support plate and the lid element in at least one point (not shown). Moreover, as stated above, instead of the use of the fixing elements the support plate and the lid element can be held together by the frame element by keeping them under tension in the frame element. 
     To convert the package  10  shown in  FIG. 2  into a frame  100 , the first embodiment of which is shown in  FIG. 5  and  FIG. 6 a   ,  FIG. 6 b   , the lid element  60  is taken out of the recess formed in the frame element  19  by the step  80 , and is placed on the face  47  of the edge portion  41  of the upper wall  42  of the frame element  19  on the side of the lower edge  43  of the outer wall  40  of the frame element  19 ; subsequently the support plate  11  is placed onto the lid element  60  on the side of the lower edge  43  of the outer wall  40 , wherein the front surface  70  of the support plate  11  abuts on the lid element  60 . The fastening of the support plate  11  in the frame element  19  is achieved by bracing engagement of the outside of the side wall  18  of the support plate  11  with the inside of the outer wall  40  of the frame element  19  under tension, as shown in the section in  FIG. 6 a    and  FIG. 6 b   . To fix the position of the lid element  60  between the inner edge portion  41  of the upper wall  42  and the support plate  11 , protrusions (not shown) can be formed on the inside of the upper wall  42  or the outer wall  40  in the plane in which the lid element  60  is arranged, preventing a sideways shift of the lid element  60 . 
       FIG. 6 a    schematically shows a cross-section of the package converted into a frame on a portion of the frame element  19 , wherein the inner surface of the upper wall  42  of the frame element  19  is formed as a recess not containing a support element. In  FIG. 6 b    a cross-section is shown on a portion of the frame element  19  comprising a support element  29  formed as a continuous separating wall in the above-mentioned recess formed on the inside of the outer wall  42 . On this portion of the frame element  19  the contact area between the frame element  19  and the lid element  60  is enlarged compared to the portion of  FIG. 6   a.    
       FIG. 7  and  FIG. 8  show a second embodiment of the package converted into a frame, whose difference to the first embodiment shown in  FIGS. 5 and 6   a ,  6   b  is that pin-shaped protrusions  46  are formed on the support elements  29  extending in parallel to the outer wall  40 , wherein the lower end of the pins  46  is situated at the level of the lower edge  43  of the outer wall  40  of the frame element  19 , that is, in the plane extending through the lower edge  43  of the outer wall  40  parallel to the plane of the frame element  19 . Preferably the pins  46  protrude from the inner surface of the outer wall  40  of the frame element  19  by the thickness of the side wall  18  of the support plate  11 . 
     As can be seen in  FIG. 7 , apertures  50  are formed adjacent to the outer circumference of the support plate  11  on the inside from the side wall  18 . The apertures  50  are arranged so that the pins  46  on the frame element  19  engage with these apertures when the frame element  19  is put on in such a way that the inside of its outer wall  40  abuts on the outside of the side wall  18 , as can be seen from  FIG. 8 . 
     The frame element  19  can be slid onto the circumferential portions of the support plate  11  until the face  47  of the edge portions  41  rests on the front side  70  of the support plate  11 . However, they can also be shifted upwards by a certain amount, so that the lid element  60  and a sheet of paper, cardboard or the like can be pushed under the face  47  of the edge portion  41 . 
     The apertures  50  in the support plate  11  are arranged so that the pins  46  of the frame element  19  extend through it in the position shown in  FIG. 8 , that is, when the front surface  70  of the support plate  11  faces the side of the upper wall  42  of the frame element  19 , as well as in the reverse position, as shown, for instance, in  FIG. 3  and  FIG. 4  (without the pins  46 ), that is, in a position where the rear surface  72  of the support plate  11  faces the side of the upper wall  42  of the frame element  19 . This facilitates a secure fastening of the support plate  11  in the frame element  19  in the frame position as well as in the package position. 
       FIGS. 9 and 10  show a third embodiment of the package convertible into a frame  100  in analogy to the embodiment shown in  FIG. 5  and  FIG. 6 a , 6 b   , but differing in that the lid element  60  is arranged at the rear surface of the support plate  11  in the frame state. In this embodiment the longitudinal and transverse dimensions of the lid element  60  correspond to the distances between the inner surfaces of the corresponding side walls  18  of the support plate  11 . Thus the lid element  60  can be arranged between the side walls  18  of the support plate  11  and be laterally fixed in its position; or alternatively can be fastened under tension between the side walls  18 . If the support plate  11  is transparent, this embodiment facilitates the creation of an effective mechanical protection of the image attached to the surface of the lid element  60  abutting on the rear surface  72  of the support plate  11 . Alternatively the lid element  60  can be fixed in its position shown in  FIG. 10  by any known method, for instance by gluing, by gluing adhesive elements on the edge portions and the like. 
       FIG. 10  shows the cross-section of a portion of the frame element  19  without a support element. At the portion of the frame element with the support element  29  the cross-section of the frame element  19  looks the same as in  FIG. 6   b.    
     In  FIG. 11  and  FIG. 12  a fourth embodiment of the package converted into a frame is shown, which differs from the second embodiment shown in  FIG. 7  and  FIG. 8  only by the sequence of arrangement of the elements with regard to one another, namely, in accordance with the fourth embodiment ( FIG. 11 ,  FIG. 12 ) the front surface  70  of the support plate  11  abuts on the inner edge portion  41  of the upper wall  42  of the frame element  19 , while the lid element  60  is arranged abutting on the rear surface  72  of the support plate  11 . The transverse dimensions of the lid elements  60  in this embodiment are such that the lid element  60  is fastened under tension between the pins  46  of the frame element  19  on the rear surface  72  of the support plate  11 . 
     Preferably all parts are injection-moulded plastic parts that can be manufactured in large amounts at low costs. 
     LIST OF REFERENCE NUMBERS 
     
         
           10 —package 
           11 —support plate 
           13 ,  14 —longitudinal sides of the support plate  11   
           15 ,  16 —transverse sides of the support plate  11   
           18 —side wall of the support plate  11   
           19 —frame element 
           23 ,  24 —longitudinal sides of the frame element  19   
           25 ,  26 —transverse sides of the frame element  19   
           29 —support elements 
           30 ,  38 —fixing element 
           31 ,  32 —cover portion of the fixing element  30 ,  38   
           33 ,  34 —lateral edges of the fixing element  30 ,  38   
           35 —side wall of the fixing element  30 ,  38   
           40 —outer wall of the frame element  19   
           41 —inner edge portion of the upper wall  42  of the frame element  19   
           42 —upper wall of the frame element  19   
           43 —lower edge of the outer wall  40  of the frame element  19   
           44 —upper edge of the outer wall  40  of the frame element  19   
           45 —support surface of the protrusion  29   
           46 —pins of the frame element  19   
           47 —face of the edge portion  41   
           50 —apertures at the circumference of the support plate  11   
           60 —lid element 
           70 —front surface of the support plate  11   
           72 —rear surface of the support plate  11   
           80 —step of the profile of the upper wall  42  of the frame element  19   
           82 —upper leg of the step  80   
           84 —lower leg of the step  80   
           100 —package  10  converted into frame