FR2655864A1 - SANDWICH CONSTRUCTION ELEMENT WITH A MODELING LAYER FOR SKIING. - Google Patents

Abstract

The invention describes sandwich construction elements, in particular for a ski (1), with several plies made of material in strips or in strips, which form outer and / or central layers and which are mutually joined by intermediate layers (22 ), an intermediate layer (22), designed as a modeling layer (10), which can in particular be elastically deformed and / or reformed.

Description

i

  The invention relates to a sandwich construction element, in particular

  ment for skis, with several plies made of material in strips or strips, which form outer layers and / or center

  which are mutually assembled by intermediate layers

  diaries. German patent application DE-A 34 06 056 discloses

  sandwich construction elements, in particular for skis, in the

  which the central part of the ski consists of layers of wood or

  strips and / or organic foams, which are glued horizontally-

  ment and / or vertically The central part of the ski is divided into at least two mutually flexible longitudinal halves, this flexible assembly only being substantially operational in the direction approximately parallel to the upper face or to the sliding face of the ski, or perpendicular to the ski edges The flexible assembly consists of cardboard cells The disadvantage is that the cardboard cell structure does not have sufficient resistance in the direction perpendicular to the lateral face, because the ribs of the cells cardboard are broken during the compression of the layers or strips of wood, so that the faculties of resistance perpendicular to the direction of deformation

are destroyed.

  The object of the present invention is to provide a sandwich construction element of the type mentioned in the introduction which allows

  a particularly spatial deformation of the material in strips or in la-

  which constitutes the outer and / or central layers, without

  deterioration of the intermediate layers.

  According to the invention, this object is achieved by the fact that an intermediate layer is designed as a de-modeling layer, which can in particular

  be elastically deformed and / or reformed The advantage of this solution

  tion is that the elastic deformation or reforming of the modeling layer makes it possible to maintain a force-transmitting assembly between

  the different profiles or bands of the outer layers and / or central

  trales, so that the resistance and therefore also the properties

  damping and elasticity of such a building element sand-

  wich can be advantageously improved.

  It is also advantageous that the central part is made up

  killed by several strips and / or profiles which extend parallel to each other in its longitudinal direction and which are assembled by

  through the modeling layers in perpendicular directions

  in the longitudinal direction, so that a profiled section of the sandwich construction element can be obtained, which considerably improves the strength and elasticity properties of such a

  element It is however possible to make the element with a sec-

  tion with a flat surface, so that the deformation can

  be carried out only just before incorporation into a ski.

  According to another improvement, it is expected that the layer of mo-

  delage is spatially deformable and can be fixed in the posi-

  deformed tion, so that by using a modeling layer, it is possible to carry out a relative offset of the different profiles or bands,

  in different spatial directions.

  But it is also possible that in the presence of relative positions

  different from the profiles or bands, the pre-

  feels a variable density in the same section regions.

  The advantage is then that one obtains, for example in the regions re-

  deformed, increased resistance to deformation

  thanks to the compression of the modeling layer and the higher density

  better. According to another alternative embodiment, provision is made for the modeling layer to have a variable density over the length of the

  profiles or bands By performing modeling layers with a den-

  variable sity over the length of the profiles or bands, we can obtain

  that following the deformation process, the modeling layer pre-

  approximately feel a constant density and therefore resistance.

  But it is also possible that the modeling layer comprises a three-dimensional support structure, in particular a cellular structure. The cellular structure allows in a simple way a relative offset of the different profiles or strips and, thanks

  to the three-dimensional framework which is formed by such a structure

  cellular structure, it is able to transmit considerable forces

  rables, even in the deformed state At the same time, the free space in the region of such a sandwich construction element remains reduced, so that, especially when this element is used for skis, one can avoid the formation of condensation due to widely fluctuating temperatures, with the resulting negative consequences. According to another configuration, it is provided that the cellular structure of the modeling layer is compressed and / or deformed

  when the profiles or bands are mutually offset, and either

  firmly fixed in this position by a profile or a strip,

  so that the cell structure is not deteriorated during the mo-

  delage and that unimpeded force transmission is possible, the

  forces to be exerted for the deformation which can be maintained relative-

  ment weak, since the fixing of the different profiles or bands in the deformed position is effected by means of an additional profile or band The advantage here is that these profiles or bands can also be introduced in the flexible state for the fixing of the different relative positions of the profiles or bands which are mutually offset by deformation of the modeling layers, so that they can adapt to the deformed surface of the sandwich construction element Once hardened, they remain in this form, so that the position of the profiles or strips of the element

  deformed sandwich construction is fixed in the desired manner.

  According to another improvement, it is expected that the layer of mo-

  delage can be reformed, in particular by thermal cracking,

  so that we can obtain it, without additional means, but by conserving it

  before the cellular structure, a persistent shift of the profiles or

  deformable bands with respect to each other, so that the de-

  formation of such sandwich construction elements can be effected

  killed before further processing or machining and without using additional supporting elements, such as profiles or strips,

for fixing in position.

  However, it is also possible that the profiles or bands are held in different relative positions by means of

  of the thermally reformed modeling layer, so that the pro-

  plastic properties of various materials which appear during re-

  heating can be used to allow a relative offset of the profiles or strips and to obtain the desired relative position

  following cooling, without additional measures.

  According to another improvement, it is expected that the profiles or

  bands are held or fixed in different relative positions

  annuities by a support element when the modeling layer is de-

  formed By associating own support elements with the deformed profiles or bands, it is possible to further reduce the load acting on the

modeling layers.

  But it is also possible that the profiles or strips form

  cavities, and that the modeling layer is constituted as a

  pleating the foam cavities, viscoplastic polyurethane foam for example, so that the profiles and / or bands can be, for example, positioned in a mold in a position corresponding to the profiling of the ski, and that the cavities configured between the profiles and / or strips can be filled with foam, in particular a polyurethane foam having strength properties and / or

of depreciation selected.

  According to another embodiment, it is expected that

  fusible sheets, polyethylene sheets for example, are available

  between the profiles and / or bands and the modeling layer, form a bonded assembly under the action of heat and / or pressure and, after hardening, constitute a means of fixing in position the profiles and / or bands and the modeling layer, so that the profiles and / or strips and the modeling layer, with the sheets

  interleaved adhesives, can be stacked in a mold,

  to the structure of the sandwich building element, without using

  use liquid and / or pasty adhesive products, for example, and

  exerting a heat and / or pressure action, an

  durable bonding of the parts of the sandwich construction element.

  It is also advantageous that the modeling layers present

  try, with the profiles or bands which join them, a cross section

  regular, in particular rectangular or square, so that the fabrica-

  tion of such sandwich construction elements and their storage

  before treatment are considerably simplified.

  But it is also possible that the construction elements form a prismatic body with the profiles or strips assembled via the modeling layers. This configuration allows

  increased resistance of the sandwich building element.

  According to another preferred configuration, it is provided that a central part of a ski is made up of several profiles

  juxtaposed in parallel in the longitudinal direction of the ski and mutual-

  ment assembled by modeling layers parallel to these profiles and made in particular of synthetic foam, so that a deformation in different spatial directions and an identical mutual offset can be obtained, both approximately perpendicular to the edges and perpendicular to the upper face, and therefore an adaptation to the most diverse desired resistance values of a

  such a sandwich building element.

  It is also possible to envisage a configuration according to which the different profiles or bands of the central part have different spacings perpendicular to their longitudinal direction, in particular perpendicular to the assembly faces between the layer

  and the profiles or strips, and the pre-

  feels a higher density in regions of lower spread

  between the profiles or bands The compressed material of the modeling layers offers higher resistance to deformation than, for example, a cardboard cell of reduced extension by folding, o

  the density of the cardboard itself is not changed.

  According to another improvement, it is provided that the different profiles or bands of the central part are arranged mutually offset in a plane receiving the assembly faces between the modeling layers and the profiles or bands, so that a

  section profile developed several times.

  But it is also advantageous that in the event of a multi-lay

  When the profiles or bands are offset in a spatial direction, the specific weight of the modeling layer is different from that which it has when the profiles or bands are arranged on a flat surface. Since the specific weight of the modeling layer is not changed only during the deformation process the resistance to

  deformation and the force to be exerted to modify the form are now

  weak nudes, while at the end of the deformation process,

  holds, at the same time as the modeling, an increase in the resistance

tance of the modeling layer.

  According to another alternative embodiment, provision is made for the different profiles or strips to be held in mutually warped positions, by a different deformation of the modeling layer, so that a rough adaptation of the construction element can be achieved. sandwich to the external shape of the product

final who receives it.

  An equally advantageous embodiment is that in which the central part is made up of several strips, notably wooden strips, parallel and directly assembled together, which are assembled to other profiles or strips by layers of

  modeling arranged in particular symmetrically with respect to a medial axis

  longitudinal dian of the central part, which facilitates the manufacturing

  tion of sandwich construction elements with a high number of profiles. However, it is also advantageous for the different profiles or bands to be produced in several parts, these profiles or bands and / or their parts being mutually assembled by layers of

  modeling arranged mutually at an angle, in particular perpendicular-

  between them, because a relative spatial deformation is thus obtained

  different layers, and this arrangement of the mo-

  delage simultaneously provides a carrying node in the element of

sandwich construction.

  Finally, it is advantageous that at least some of the profiles or bands are surrounded on all sides by a modeling layer and are joined to the neighboring profiles or bands by means of this layer. It is thus possible to modify the relative position of a profile. or band with respect to the others, in order to modify the elasticity or damping properties, without having to modify the

  overall section of the sandwich construction element.

  Finally, it is also advantageous that the modeling layers are made of plastic and / or rubber, and with predefined damping properties. By using modeling layers having the desired damping behavior, it is

  also possible, following the deformation of the mode layers-

  lage, to use the damping properties still present for damping movements, when using the ski, the sandwich construction element, or even profiles or bands

  relative to each other in the sand- building element

  wich This is particularly advantageous for sandwich construction elements used in a ski, since this provides an additional means of controlling the damping behavior of the ski.

  skiing in the presence of different flexural stresses.

  The following description describes the invention in more detail with the aid of exemplary embodiments shown in the accompanying drawings, in which: FIG. 1 is a top view, partially in section, of a

  ski made with a sandwich construction element configured to be

  mement to the invention; Figure 2 is a side view, partially in section, of the ski according to Figure 1; Figure 3 is a cross-sectional view of the ski along line III-III of Figure 1; Figure 4 is a cross-sectional view of the ski along line IV-IV of Figure 1; Figure 5 is a front view, in section, of the ski along the line V-V of Figure 1; Figure 6 is a front view, in section, of another variant

  of a sandwich construction element, with prof i-

  strips or bands spatially offset from each other;

  FIG. 7 is a front view, in section, of another configuration.

  ration of a ski provided with modeling layers; FIG. 8 is a front view, in section, of another position of the lamellae in a sandwich construction element according to the invention, following the deformation of the modeling layer; Figure 9 is a front view, in section, of a sandwich construction element according to the invention, with profiles, arranged between the modeling layers, which are offset in height relative to the profiles located outside; Figure 10 is a cross-sectional view, in section, of

  the sandwich construction element of FIG. 9 in another re-

  section of the sandwich construction element; Figure 11 is a front view, in section, of another alternative embodiment of a sandwich construction element; FIG. 12 is a front view, in section, of a sandwich construction element according to the invention with a modeling layer surrounding a profile, in the undeformed state; FIG. 13 shows the sandwich construction element according to FIG. 12 with profiles deformed with respect to each other; FIG. 14 shows the sandwich construction element of FIG. 13 with profiles deformed with respect to one another, in another region of section; FIG. 15 is a front view, in section, of a sandwich construction element with modeling layers extending at an angle with respect to each other; FIG. 16 is a sectional view of part of a modeling layer, with a perspective representation of the various cellular structures in the compressed edge and in the central region. Figures 1 and 2 show a ski 1 having a width 2

  and a thickness 3 variable in its longitudinal direction Ski 1 pre-

  feels a central part 5 made in the form of an element of

  sandwich construction 4 The sandwich construction element 4 is com-

  laid with several plies, which consist of profiles or strips 6, for example of lamellar material, which are arranged in the longitudinal direction of the ski and which are mutually assembled by intermediate layers The central part 5 is embedded between outer layers 7.8 which constitute the upper face 9 and the face of

skiing 1.

  As shown in Figures 1 and 2, modeling layers 10

  extending in the longitudinal direction of the ski are provided with sec-

  different positions perpendicular to the longitudinal development of the

  ski The variable geometry, in the longitudinal direction of ski 1, of the pro-

  wire of the modeling layers 10 is obtained by a spatial deformation

  elastic or a reforming of the modeling layer 10.

  Following the deformation or reforming of the modeling layer 10, a distance 11 between the profiles 6 can be modified, and it is for example, approximately in the middle 12 of the ski, less than a

  distance 13 closer to a point 14 and an end 15 of ski 1.

  With a section of profiles 6 made of strip material or

  sipes which remains constant in the longitudinal direction of the ski, we obtain

  thus holds a corresponding size and thickness appearance of the ski 1 In FIGS. 1 and 2, in order to better highlight the folds and the layers, the dimensions of the ski 1 are shown at a

distorted scale.

  In FIGS. 3 to 5, the ski 1 is shown in section on a larger scale, which allows a better view of the structure of the central part 5 and of the sandwich construction element 4, with the

  intermediate layers and folds made of lamellar material.

  The sandwich construction element 4 has several layers

  modeling 10 (three in the example shown) in the longitu-

  dinal of the ski, which are approximately uniformly distributed over a width 16 of the ski 1 Between two modeling layers 10 is

  each time a profile 17, for example an element in the form of the

  wood chips for example, which is assembled to the modeling layer on a contact face 18, for example by gluing or foaming

  the modeling layer 10 side cheeks 20, consisting of the

  of wood or plastic, which constitute the boundaries

  of ski 1 and which are able to withstand stresses

  external, are arranged on lateral faces 19 of the layers of mo-

  outer thread 10 and are assembled to them, for example by gluing. The sandwich construction element 4, which consists of the side cheeks 20, the modeling layers 10 and the profiles 17, has substantially a rectangular section of width 16 and height 21 Intermediate layers 22, for example with several plies, are arranged in the direction of the upper face 9 of the ski 1 and assembled with the sandwich construction element 4 The upper face 9 is formed by a protective layer 23, resistant to impacts and / or scratches, which covers the intermediate layers 22 and the sliding face is formed by a sliding face coating 24 which reduces friction and by edge elements 25, steel edges

  for example, which extend in the longitudinal direction of ski 1 and give

  give ski 1 the necessary lateral support, even on hard slopes

and icy.

  As shown by the different hatching directions of the modeling layers 10 in FIGS. 3 to 5, the section of the ski 1 is adapted to the width variations necessary to obtain the size in the middle 12 of the ski and the larger width 2 towards the point 14 and

  the end 15, by the fact that in the middle 12 of the ski, the layers of mo-

  delage 10 are deformed in the direction of the arrows 26.

  As still shown in FIG. 5, it is possible to modify the modeling layers 10 by exerting a force in the direction of the arrows 27 at different heights 28. It is thus possible to modify the thickness 3 of the ski 1 in its longitudinal direction. distorting

  and / or reforming the modeling layer 10 disposed along the metrical axis

  dian, a profile 29 can be offset from other profiles, for example to configure a guide groove 30, or

  in order to incorporate a load-bearing element 31, as for example in the

  ski binding region 1 for mounting a ski binding.

  Figures 6 to 8 show in cross section the sandwich construction element 4 consisting of modeling layers 10 and side cheeks 20 In this embodiment, three sections 32, central lamellae for example, and two side cheeks 20 are

  for example assembled on the width 2 of the ski 1, in their longitudinal direction

  tudinal, by the modeling layers 10 In the example shown, the modeling layers 10 are made of a deformable and / or reformable material of cellular structure By deforming and / or reforming the modeling layers 10, the profiles can be positioned 32 and the side cheeks 22 with respect to each other as a function of the desired cross-sectional shape of the ski 1, for example in the region of the edge elements 25 or of the guide groove 30, or also to incorporate the carrier element 31 A height offset 33 makes it possible for example to produce the load-bearing elements 31 in the form of

  support profiles 34, which must fix the position of the layers of mo-

  delage 10 and simultaneously give ski 1 an increased torsional rigidity

  raw, which is particularly advantageous during negotiated turns

pidly on bumpy tracks.

  As still shown in Figure 8, we can also arrange the

  profiles 32 at an angle 35 to each other, by a

  different height formation of the modeling layer 10 In order

  to obtain a ski 1 of trapezoidal section, it is for example equal-

  ment possible, by a spatial deformation and / or a reforming of the modeling layer 10 disposed between the profile 32 and the side cheek

  , to arrange the side cheek 20 at an angle 36 with respect to the

  neighboring yarn 32 The different deformation and / or reforming ratios in the modeling layers 10 are represented by the magnitude ratios and by the more or less deformed representation of the cellular structure schematically drawn In FIGS. 6

  at 8, for clarity, the outer layers have not been shown

  8, and we have sketched in dashed line the profile shape of the ski

  1, edge elements 25 and the guide groove 30.

  Figures 9 and 10 show in cross section a ski 1, with its sandwich construction element 4, in the region of the middle 12 of the ski and in the region of the wing 37 disposed in the direction of the

  point 14 In this variant, profiles 32 mutual-

  Lement assembled are arranged on either side of the median axis, in the longitudinal direction of the ski 1, on the width 2 of the ski 1, and they

  are assembled, each time via a fashion layer-

  lage 10, to other sections 38 arranged between the side cheeks 20 and the modeling layers 10 The sections 32 and 38 have the same height 28, the sections 32 having a height offset 33 relative to the sections 38 by the deformation and / or the reforming of

  the modeling layer 10 It is thus possible, for example, to pre-

  see in the region of section 39, 40 formed by the offset in height

  carrier 33, in the zone between the outer layers 8 and the sandwich construction element 4, load-bearing and / or damping layers 41 and / or support elements 34 which modify the resistance and / or the behavior of damping the ski 1 As also shown in FIGS. 9 and 10, the different width 2 of the ski 1 in the middle 12 of the ski and in the region of the wing 37 can be obtained by a different deformation of the modeling layer 10, to a

  identical width 42 of profiles 32 and 38 in themselves.

  FIG. 11 shows, in cross section, another va-

  configuration of the sandwich construction element 4 of the ski

  1 The modeling layer 10 is here formed by an approximate profile

  T-shaped clothing which is arranged in the longitudinal direction of the ski 1 and being turned 90 ′ with respect to an axis of symmetry 43 In regions of section 44, formed by a core 45 and branches 46, several profiles in strips 38 are for example arranged in the

  longitudinal direction of the ski 1 and assembled with the modeling layer 10.

  Other profiles 38 are arranged against the lateral faces 19 of the branches 46 of the T-shaped modeling layer 10, and against them the lateral cheeks 20 By deforming or reforming the modeling layer 10, we

  can bring the different profiles 38 to different relative positions

  by applying an external stress to the surface, for example in a mold Thanks to support elements 34, for example profiled strips or thermally deformable elements, it is possible to fix the relative positions of the different profiles 38 By

  fusible sheets 47 arranged between the side cheeks 20, the pro-

  38 and the modeling layer 10, we can obtain, by exercising if-

  simultaneously a pressure and temperature stress, both the desired shaping of the section and the assembly of the elements

constituting the section.

  Figures 12 to 14 show the section of a ski 1 with more

  several modeling layers 10, made up of hollow profiles, which are arranged in the longitudinal direction of the ski 1 These modeling layers 10 in the form of profiles are arranged between several profiles 38 which are assembled to the modeling layers 10 Between the profiles 38, and between a profile 38 and the modeling layer 10, as well as between the sandwich construction element 4 and the sliding face coating 24 and / or the protective layer 23, layers are arranged

  intermediates 22 in the form of folds, or even in regions par-

  ski 1, profiled support elements 34 The inner layers

  intermediates 22 can also consist of fusible sheets 47, for example of polyethylene In this way, by exerting for example a temperature stress on the sandwich construction element, the different sections 38 are effectively bonded to each other

  and to the modeling layer 10 As these figures show, the

  the hollow strips of the modeling layers 10 can be filled with filling strips 48, for example of wood or plastic, with a material having resistance and / or damping properties different from those of the modeling layer 10,

  in order to obtain an integrated constructive element It is also pos-

  can fill the hollow profiles with foam.

  FIGS. 13 and 14 also show that it is possible, even when modeling layers 10 are used in the form of hollow sections, to bring the sections 38 to different relative positions, in order to integrate the support elements 34 , the edge elements 25

  and guide grooves 30 in the section profile of a ski 1.

  FIG. 15 represents modeling layers 10 in X, intended

  born to form a sandwich construction element 4, which are available

  located approximately symmetrically with respect to the axis of symmetry 43 in the longitudinal direction of the ski 1 and which are assembled to profiles 38 by intermediate layers 22 In order to obtain a simple realization of the assembly of the element of sandwich construction 4, the intermediate layers 22 can be made of fusible sheets 47, for example of polyethylene By using materials

  different, and / or different deformation and / or reforming measures

  annuities, during the production of the sandwich construction element 4

  or even modeling layers 10, the modeling layers 10

  spun in X can have different properties of resistance and / or damping in their section development and / or in their longitudinal development So that in total, we can adapt the mechanical and / or dynamic behavior of a ski 1 to the different conditions of use of such sports equipment. Thus, as also shown in FIG. 15, a cavity 50 can be provided at the point of intersection of the branches 49 of the profiled modeling layer X, in the longitudinal direction. of the latter, in order to receive a fluid 51 whose physical state varies at different temperatures It is also possible, for example, to solicit the fluid 51, according to selectable parameters, with a variable pressure coming from, in accordance with the double arrow 52 , a pressure system 53, for example in order to adapt the behavior of the ski 1 to conditions

outside.

  For the manufacture of sandwich elements such as those which have

  presented in the above description, we can proceed as

  follows. As modeling layer 10, it is possible to use, for example, a cold moldable foam having a specific weight of 40 to 80 kg / m 3, which can be produced in production lengths in the form of strips, strips or profiles, or alternatively fixed lengths adapted to those of the skis The modeling layer 10 can also, for example, be cut from sheets of synthetic foam, or be made of foam in molds, as a finished element It is then possible,

  for example, introducing layers of mo-

  trimming 10 with the prefabricated profiles 38, the side cheeks 20,

  the intermediate layers 22, the protective layers 23, the elements

  edge 25 and the sliding face coating 24, and to form ski 1 without subsequent mechanical machining, by applying a load

  distributed over the surface and with a simultaneous action of temperature.

  It is therefore particularly advantageous to have sheets between the elements constituting the sandwich construction element 4

  fuses 47, for example made of polyethylene, which melt during reheating

  and form an insoluble adhesive layer to join the

* elements Thanks to the load distributed over the surface and the action if-

  temperature, the cellular structure of the mode layers

  Age 10 is also thermally influenced, so that

  holds for example a decrease in the thickness of the mode layer-

  lage 10 during the compression process, and therefore a collapse

  drastically of the cellular structure in the edge region of the modeling layer It is thus possible to give the modeling layers an increased specific density and weight in the edge region, by

  the choice of temperature and the appropriate pressure stress

  required, in order to adapt the density, the specific weight and the mechanical and dynamic behavior of the modeling layers to the cases

  application target Thanks to the capacity of deformation and / or

  forming the modeling layers 10 of the building element sand-

  wich 4, the exterior shaping of ski 1 can also be obtained by

  very simple, as well as the thickness and width ratios when using profiles 38 which in themselves have sections

  identical in the longitudinal direction.

  If an adhesive is used for the adhesive layer, it must be ensured whether it still retains its adhesive power after heating to about 150 degrees C, or whether it liquefies in

  this temperature range It is thus guaranteed that, during the stress-

  temperature and pressure during the manufacture of

  sandwich construction element 4, the adhesive will stick in a

  map the different components of the building element

sandwich 4.

  The application of the device and the method according to the invention do not pose any limits as regards the materials used for

  the modeling layers 10, the intermediate layers 22 and the pro-

  spun 32, 38 It is thus possible to use foams, hard plastics

  and soft plastics, wood or metal, laminates or ele

carbon fiber.

  Finally, FIG. 16 is a sectional view of a mode layer

  lage 10 disposed between intermediate layers 22 As shown in this figure, the modeling layer 10 of variable thickness has

  surface regions 54,55 differently deformed The mo-

  delage 10 and the intermediate layers 22 associated with it must

  wind allow sufficient deformation to allow the modeling layer 10 to be profiled without appreciable degradation of the material FIG. 16 aims to show the way in which the mechanical and thermal compression acts in the surface region 55 of the modeling layer 10 with respect to the surface region 54 As can be seen, in the edge region facing a surface 56, the open cells 57,

  which consist of a three-dimensional plastic structure

  sions with a multiplicity of ribs 58, are crushed by the com-

  mechanical and thermal pressure, so that the approximate cells

  tively spherical 57 and / or the ribs 58 which join them are compressed and partially broken By this deformation undertaken under the action of pressure and temperature, the resistance as well as the density and the specific weight are increased in the edge region turned towards the surface 56 If this compression takes place flat, it decreases linearly or gradually, according to the chosen working criteria, towards the central region, in which the

  initial cell structure remains unchanged.

  The solution proposed by the invention therefore differs from

  modeling layers in which a corrugated board, for example,

  tapered between profiles, produces a change in section in the external dimensions of a ski 1 by changing the spacing of

  different cardboard strips, because such a constructive element does not

  does not act on the resistance properties, mechanical or dynamic.

  Of course, the different embodiments described above

  before, and the variants and the different embodiments presented

  ted in these exemplary embodiments, may constitute independently

  inventive solutions to each other but can also

  be combined with each other at will.

Claims (19)

  1 Sandwich construction element, rtamait for skis,   bearing folds folds made of material in strips or strips,   which form outer and / or central layers and which are   tually assembled by intermediate layers, characterized in that it coperlune neck 1 ein L na e (22) forming modeling layer   (10), which can in particular be elastically deformed and / or reformed.   2 sandwich construction element according to claim 1,   characterized in that the central part (5) consists of several   sections and / or bands (6,17,29,32,38) which extend parallel-   lying between them in its longitudinal direction and which are assembled by   through the modeling layers (10) in per- pendulars in the longitudinal direction.   3 sandwich construction element according to claim 1 or 2, characterized in that the modeling layer (10) is spatially   deformable and can be fixed in the deformed position.   4 Sandwich construction element according to any one of   Claims 1 to 3, characterized in that in the presence of positions   different relative to the profiles or bands (6,17,29,32,38), the modeling layer (10) has a variable density in the same section regions.   Sandwich construction element according to any one of   Claims 1 to 4, characterized in that the modeling layer (10)   has a variable density along the length of the profiles or strips (6,17,29,32,38).   6 Sandwich construction element according to any one of   Claims 1 to 5, characterized in that the modeling layer (10)   includes a three-dimensional support structure, including a cell structure.   7 Sandwich construction element according to any one of   Claims 1 to 6, characterized in that the cell structure of   the modeling layer (10) is compressed and / or deformed when the sections or bands (6,17,29,32,38) are mutually offset, and is   especially fixed in this position by a profile or strips.   8 Sandwich construction element according to any one of   Claims 1 to 7, characterized in that the modeling layer (10)   can be reformed, in particular by thermal cracking.   9 Sandwich construction element according to any one of   Claims 1 to 8, characterized in that the profiles or strips   (6,17,29,32,38) are held in different relative positions by means of the thermally reformed modeling layer (10). Sandwich construction element according to any one of   Claims 1 to 9, characterized in that the profiles or strips   (6,17,29,32,38) are held or fixed in relative positions   different by a support element (34) when the mode layer the age (10) is deformed.   11 Sandwich construction element according to any one of the   Claims 1 to 10, characterized in that the profiles or strips   (6,17,29,32,38) form cavities, and the modeling layer is   formed by filling the cavities with foam, poly foam   viscoplastic urethane for example.   12 Sandwich construction element according to any one of   Claims 1 to 11, characterized in that fusible sheets   (47), polyethylene sheets for example, are arranged between the profiles and / or strips (6,17,29,32,38) and the modeling layer (10), form an assembly bonded under the action of heat and / or pressure and, after hardening, constitute a means of fixing in position the profiles and / or strips (6,17,29,32,38) and the layer of modeling (10).   13 Sandwich construction element according to any one of the   Claims 1 to 12, characterized in that the modeling layers   (10) have, with the profiles or bands (6,17,29,32,38) which   assemble, a regular section, in particular rectangular or square.   14 Sandwich construction element according to any one of the   Claims 1 to 13, characterized in that the construction elements   tion form a prismatic body with the profiles or bands (6,17,29, 32,38) assembled via the modeling layers (10).   Sandwich construction element according to any one of   Claims 1 to 14, characterized in that a central part (5)   of a ski (1) is made up of several sections (6,17,29,32,38) jux-   tapped in parallel in the longitudinal direction of the ski and mutually assembled by modeling layers (10) parallel to these profiles   and consist in particular of synthetic foams.   16 Sandwich construction element according to any one of the   Claims 1 to 15, characterized in that the different profiles   or bands (6,17,29,32,38) of the central part (5) have different spacings perpendicular to their longitudinal direction, in particular perpendicular to the joining faces between the modeling layer (10) and the profiles or bands (6,17,29,32,38), and the   modeling layer (10) has a higher density in the   regions with smaller spacing between profiles or strips (6,17,29,32,38).   17 Sandwich construction element according to any one of   Claims 1 to 16, characterized in that the different profiles   or strips (6,17,29,32,38) of the central part (5) are arranged mu-   staggered in a plane receiving the joining faces between the modeling layers (10) and the profiles or strips (6,17,29,32,38).   18 Sandwich construction element according to any one of the   Claims 1 to 17, characterized in that in the event of multiple arrangements   tually offset profiles or bands (6,17,29,32,38) in direction   spatial, the specific weight of the modeling layer (10) is different   rent from the one it has when the profiles or bands (6,17,29,32,38) are arranged on a flat surface.   19 Sandwich construction element according to any one of the   Claims 1 to 18, characterized in that the different profiles   or bands (6,17,29,32,38) are held in mutual positions-   slightly warped, by a different deformation of the mode layer- lage (10).   Sandwich construction element according to any one of   Claims 1 to 19, characterized in that the central part (5)   consists of several slats, notably wooden slats, pa-   aligned and directly assembled together, which are assembled   other profiles (6,17,29,32,38) or strips by fashion layers-   beam (10) arranged in particular symmetrically with respect to a metrical axis   longitudinal dian of the central part (5).   21 Sandwich construction element according to any one of the   Claims 1 to 20, characterized in that the individual profiles   (6,17,29,32,38) or bands are made in several parts, and these   sections or bands (6,17,29,32,38) -and / or their parts are mutual-   joined together by mutually arranged modeling layers (10)   at an angle, in particular perpendicular to each other.   22 Sandwich construction element according to any one of   claims 1 to 21, characterized in that at least some of the pro-   yarns or bands (6,17,29,32,38) are surrounded on all sides by a   modeling layer (10) and are assembled to the profiles or strips   sins (6,17,29,32,38) through this layer.   23 Sandwich construction element according to any one of the   Claims 1 to 22, characterized in that the modeling layers   (10) are made of plastic and / or rubber, and with   predefined damping properties.