FR2845296A1 - SLIDING OR RUNNING BOARD - Google Patents

Abstract

Gliding or rolling board (1) comprising, in height, a first reinforcement (21), a second reinforcement (23), and a core (22) located between the reinforcements (21, 23). The core (22) comprises a die (30) made of a filling material, at least one insert (31) being housed in the die (30), the insert (31) exhibiting at least one mechanical property greater than that of the die (30) , this property possibly being tensile strength or the like.

Description

i

SLIDING OR RUNNING BOARD

  The invention relates to the field of sliding or rolling boards intended to support the two feet of a user. Such boards are used for the practice of

  snow or water surfing, skateboarding, or whatever.

  A board according to the prior art has a length measured in a longitudinal direction of the board between a first end and a second end, as well as a width and a height. Generally the board includes in height a lower reinforcement, an upper reinforcement, and at least one core situated between the lower reinforcement and the upper reinforcement. The board also has, from the first to the second end, a first end zone, a first intermediate zone, a first reception zone, a central zone, a second reception zone, a second intermediate zone, and a

second end zone.

  In known manner the core extends in all of the areas of the board. The physical constitution of the nucleus directly influences the mechanical characteristics of the

1 5 board, as well as its price.

  Some cores are made with materials with low mechanical resistance, such as tensile strength, and at low cost price. These materials can be a foam cellular with a plastic material, such as a polyurethane foam. Such a core is easy to make technically and inexpensive. It makes it possible to reduce the manufacturing cost of a board, and essentially performs a filling function of the volume between the reinforcements. Other cores are made with materials whose mechanical strength is higher, but whose cost is also higher. These materials can be wood, used in the form of juxtaposed battens or glue-laminated. Such a core is more complicated to produce technically and more expensive. It increases the cost of manufacturing a board, but gives it a good ability to accumulate and restore energy from a

deformation of the board.

  One of the aims of the invention is to configure the kernel so that, on the one hand, it is able to accumulate and restore a large amount of energy at least in certain cases and, on the other hand apart from the fact that it is relatively inexpensive to produce. It's about optimizing the price ratio

  cost compared to mechanical characteristics.

  For this, the invention provides a gliding or rolling board having a length measured in a longitudinal direction between a first end and a second end, a width measured between a first edge and a second edge, and a height measured between a face. lower or sliding and an upper face, in height the board comprising in particular a first reinforcement, a second reinforcement, and at least one core located between the first reinforcement and the second reinforcement, the board also having, from the first to the second end , a first end zone, a first intermediate zone, a first reception zone, a central zone, a second reception zone, a second zone

  intermediate, and a second end zone.

  The board according to the invention is characterized in that the core comprises a matrix made of a filling material, the matrix having at least one cavity, at least one insert being housed in the cavity of the matrix, in an area determined of the board, the insert having at least one mechanical property superior to that of the matrix, this property possibly being the tensile or compressive strength, the flexural strength, the limit

  elastic, or other, so as to locally improve the mechanical properties of the board.

  Each insert is housed in the core to locally improve its mechanical properties.

  For example, a central longitudinal insert, which extends from the first to the second reception area, improves the ability of the board to accumulate and restore the energy linked to a

bending along a transverse axis.

  Or a lateral longitudinal insert, which extends along an edge, improves the ability of the board to register in a curve on hard surfaces like ice.

  The invention therefore makes it possible to confer on the board certain specific skills linked to the location of the inserts, in association with control of the manufacturing costs associated with the use of an economic matrix. The invention makes it possible to optimize the technicality of the

core and manufacturing costs.

  The invention also relates to a method of manufacturing a sliding or rolling board, in which the core comprises a matrix made of a filling material.

  with at least one insert housed in the matrix.

  Other characteristics and advantages of the invention will be better understood using the

  description which follows, with reference to the appended drawing illustrating, by way of nonlimiting examples, how the invention can be implemented, and in which:

  - Figure 1 is a perspective view of a board, according to a first embodiment of the invention, - Figure 2 is a section along II-II of Figure 1, - Figure 3 is a section along III -III of Figure 2, 30 - Figure 4 is a section on IV-IV of Figure 2, - Figure 5 is a section similar to that of Figure 3, according to a second embodiment of the invention, - Figure 6 is a section on VI-VI of Figure 5, - Figure 7 is a section similar to that of Figure 2, according to a third embodiment of the invention,

  - Figure 8 is a section along VIII-VIII of Figure 7.

  Although the description below relates to snowboards, or snowboards, it

  must be understood that it also relates to other boards adapted to the practice of sports

as mentioned before.

  The first embodiment of the invention is presented using FIGS. 1 to 4.

  As is known in FIG. 1, a snowboard 1 has a length measured in a longitudinal direction L between a first end 2 and a second end 3. The board 1 also has a width measured in a transverse direction between a first lateral edge 4 and a second lateral edge 5, thus

  than a height measured between a lower face or glide 6 and an upper face 7.

  Of course, the transverse direction is perpendicular to the longitudinal direction L, and

  parallel to the underside 6.

  The board 1 also has, from the first end 2 to the second 3 end, a first end zone 8, a first contact line Wl, a first intermediate zone 9, a first reception zone 10, a central zone 11, a second reception area 12, a second intermediate area 13, a second contact line W2, and a

second end zone 14.

  Each reception area 10, 12 is designed to receive a device for retaining a foot of the user. The devices, not shown, can be secured to plate 1 by a

  medium such as screws. Each reception area 10, 12 is provided for this purpose with threaded orifices 15.

  Each of the contact lines W1, W2 is a line, substantially transverse of the board 1, at which the lower face 6 touches a flat surface when the board

  1 rests on the surface without external influence.

  The height of the board 1 is visualized in section in FIG. 2.

  From the lower face 6 to the upper face 7, the board 1 has a sole 20, a

  first reinforcement 21, a core 22, a second reinforcement 23, and a protective layer 24.

  The sole 20 is made for example with a plastic material containing

  polyethylene. The protective layer 24 is made, for example, from a plastic material containing an acetyl-butadiene-styrene.

  Each of the reinforcements 21, 23 is preferably made from fibers impregnated with a resin. The fibers can be made with any material, or with any mixture of materials,

  such as glass, carbon, aramid, metal, or the like.

  The reinforcements 21, 23 and the core 22 form a sandwich panel which extends over at least 50% of the surface of the board, and preferably substantially over the entire surface.

  The core 22 occupies substantially the space delimited between the reinforcements 21, 23, and maintains

the gap between the reinforcements 21, 23.

  According to the invention as can be understood with the aid of FIGS. 2 to 4, the core 22 comprises a matrix 30 made of a filling material, an insert 31 being housed in the matrix 30, the insert 31 having at minus a mechanical property greater than that of the matrix, this property possibly being the tensile or compressive strength, the flexural strength,

the elastic limit, or whatever.

  The matrix 30 extends substantially along the entire surface of the board 1, that is to say in length between the first 2 and second 3 ends, and in width between the first 4 and

second 5 side edges.

  According to the first embodiment of the invention, the insert 31 is disposed centrally 5 in the longitudinal direction. The matrix 30 connects the first 21 and second 23 reinforcements to each other. A through cavity 32 is formed in the matrix 30 to receive the insert 31.

  Preferably the shapes of the cavity 32 and of the insert 31 are substantially the same, from

  so as to ensure a certain continuity of the core 22.

  In this case, the insert 31 is represented in the form of an elongated piece, which extends continuously from the first reception area 10 to the second reception area 12.

  The insert 31 is oriented substantially in the longitudinal direction L of the board 1. The insert

  31 is located substantially halfway between the first 4 and second 5 side edges.

  In a plane substantially parallel to the lower face 6 or to the upper face 7, according to FIG. 3, the insert 31 has for example a rectangular section. Preferably its length 15 is between 30 and 80% of that of the board 1, and its width is between 10 and

% of that of plate 1.

  In a transverse plane substantially perpendicular to the lower face 6 or to the upper face 7, according to FIG. 2, the insert 31 has for example a rectangular section. In the manner of the matrix 30, since the cavity 32 is through, the insert 31 connects the first 21 and second 23 reinforcements to each other. This allows a continuous framing of the threaded orifices 15. Instead of having a parallelepiped shape, as in the case of FIGS. 2 and 3, the insert 31 according to FIG. 4 has a wavy face in a central longitudinal plane substantially perpendicular to the lower face 6 or to the upper face 7. This corrugated face successively has a first boss 33, a central hollow 34, and a second boss 35. The

  bosses 33, 35 and the central recess 34 correspond, respectively, to the reception zones 10, 12 and to the central zone 11 of the board 1. In fact the reception zones 10, 12 are raised relative to the zone central 11, and the intermediate zones 9, 13. Thus the reception zones 10, 12 are sufficiently thick to accommodate the fixing screws of the retaining devices. The wavy side follows the profile of the board.

  The matrix 30 is preferably made from a plastic foam, such as a polyurethane foam. Of course, the matrix 30 could have been made otherwise, by

  example with a plastic loaded with low density particles.

  In all cases the matrix 30 has a reduced density, preferably between 35 0.1 and 0.6 kg / dm3. Thus the matrix 30 contributes to reducing the mass of the core 22, and by

consequently that of Plate 1.

  The insert 31 is preferably made from a material comprising wood. It can be plywood, glulam, a solid piece, a juxtaposition of solid pieces, or other. It is preferred to orient the wood fibers in the direction of the length of the board. Of course, the insert 31 could have been done otherwise, for example with a plastic material reinforced with fibers such as glass fibers, carbon, aramid, or any other material having the properties of accumulation and restitution of energy, or other desired. Again it is preferred to orient the fibers of the insert 31 in the direction of the length of the board.

  The density of the insert 31 can be between 0.2 and 1.2 kg / dm3.

  A preferred method for making plate 1 is presented below.

  The method comprises a step of manufacturing the core 22, as well as a step

  assembly of the constituent elements of the board.

  The step of manufacturing the core 22 consists in placing the insert 31 in a first mold in the shape of the core 22, then in producing the matrix 30 by injecting plastic foam into the mold. The foam extends around the insert 31, to form therewith the core 22. It can be provided to add two bonding films in the mold, so as to

  cover the core 22 on both sides.

  1 5 The step of assembling the constituent elements of the board 1 consists in placing, in a second mold, a stack which comprises the sole 20, the first reinforcement 21, the core 22, the second reinforcement 23, and the layer of protection 24. Then an elevation of

  temperature and pressure secures the elements to each other.

  Of course, other manufacturing processes could be provided. That according to the invention 20 has the advantage of requiring few successive operations, which contributes to reducing the

production time.

  Plate 1 obtained is, all other things being equal, relatively inexpensive at

  manufacture. This is due to the fact that its core 22 is economical. The matrix 30 is obtained in a single operation, and the foam which constitutes it is inexpensive. The insert 31 has reduced dimensions, compared to those of the board, and also has a simple geometry.

  In particular, the shaping of the insert is quick to perform.

  Plate 1 according to the first example, with its central longitudinal insert 31, is well suited for performing figures of style. In particular in cases where the board 1 must accumulate and restore energy by bending along a transverse axis. The insert 31 behaves like a leaf-shaped spring. Thus the board 1 substantially benefits from the technical advantages provided by a wooden core, while having substantially the economic advantages brought by a foam core. The core 22 uses the amount of wood,

  just necessary, located where it is needed to achieve the desired driving behavior.

  The second embodiment of the invention is presented below with the aid of FIGS. 5 and 6.

  For the sake of convenience, it is essentially the differences from the first example that are highlighted. In this second embodiment example,

  inserts are arranged along the edges of the core.

  A board 50 extends longitudinally between a first 51 and a second 52 ends, transversely between a first lateral edge 53 and a second lateral edge 54,

  and in height between a lower face 55 and an upper face 56.

  Here again the board 50 has, from the first end 51 to the second end 52, a first end zone 57, a first intermediate zone 58, a first reception zone 59, a central zone 60, a second zone d reception 61, a second area

  intermediate 62, and a second end zone 63.

  The board 50 preferably includes, in height, a sole 70, a first reinforcement 71,

  a core 72, a second reinforcement 73, and a protective layer 74.

  According to the invention, the core 72 of the second exemplary embodiment comprises a matrix

  made of a filling material, a first lateral insert 81 and a second lateral insert 82 being housed in the matrix 80. Each of the lateral inserts 81, 82 has at least one mechanical property superior to that of the matrix 80, this property possibly be tensile or compressive strength, flexural strength, yield strength, or the like.

  Again the matrix 80 extends substantially along the entire surface of the board 50, that is to say in length between the first 51 and second 52 ends, and in width between the

  first 53 and second 54 side edges.

  According to the second embodiment of the invention, the matrix 80 connects the first 71 and second 73 reinforcements to each other. A first 83 and a second 84 non-through cavities are formed in the matrix 80 to accommodate the inserts 81, 82 respectively. Preferably the shapes of the cavities 83, 84 and the inserts 81, 82 are substantially the same. Each of the inserts 81, 82 is shown in the form of an elongated piece, which extends continuously from the first intermediate zone 58 to the second intermediate zone 62. Each of the inserts 81, 82 is oriented substantially according to the length of the board 50. The first insert 81 borders the first lateral edge 53. By analogy the second

  insert 82 borders the second lateral edge 54.

  In a plane substantially parallel to the lower face 55 or to the upper face 56, according to FIG. 5, each insert 81, 82 has ends 85, 86, 87, 88 respectively.

  relatively narrow, and a center 89, 90 wider than the ends. This allows, along the board 50, to vary the ability of the board to accumulate and restore energy in a transverse direction. The accumulation and restitution are greater where the inserts 81, 82 are wider, in this case in the central zone 11, between the feet of the user.

  In the height direction of the board 50, according to FIG. 6, the thickness of each insert

  81, 82 is preferably substantially constant. This makes it easier to manufacture.

  Each of the inserts 81, 82 is supported on the first reinforcement 71, on the side of the sole 70.

  This allows each insert to be closer to the sole. It follows that, when taking

  lateral edge, an insert 81, 82 collects part of the driving forces.

  As structured, the board 50 according to the second exemplary embodiment is suitable for driving which requires precise edge grips. The lateral arrangement of the inserts 81, 82 favors a precise inscription of the board 50 in a curve, in particular on hard floors

  like groomed or icy snow.

  The materials and manufacturing processes used for board 50 according to the second

  exemplary embodiment, are identical or similar to those used for plate 1 according to the first example.

  The third embodiment of the invention is presented below using the figures

7 and 8.

  For the sake of convenience, these are essentially the differences from

  other examples that are highlighted. In this third embodiment, an insert is arranged centrally in the longitudinal direction.

  A board 100 extends longitudinally between a first 101 and a second 102 ends, transversely between a first lateral edge 103 and a second lateral edge

  104, and in height between a lower face 105 and an upper face 106.

  Again the board 100 has, from the first end 101 to the second end 20 102, a first end zone 107, a first intermediate zone 108, a first reception zone 109, a central zone 110, a second zone d reception 111, a second

  intermediate zone 112, and a second end zone 113.

  The board 100 includes in height, preferably, a sole 120, a first reinforcement

  121, a core 122, a second reinforcement 123, and a protective layer 124.

  According to the invention, the core 122 of the third example comprises a matrix 130 made of a filling material, an insert 131 being housed in the matrix 130, the insert 131 having at least one mechanical property greater than that of the matrix. The insert 131 is arranged centrally in the longitudinal direction. A non-through cavity 132 is formed in the matrix 130 to accommodate the insert 131. Preferably the shapes of the cavity 132 and of the insert 30 are substantially the same, in this case parallelepiped. The cavity 132

  opens on the side of the first reinforcement 121.

  At least one groove 133 is provided in the matrix 130. Each groove 133 is of

  preferably opposite the insert 131. Each groove 133 preferably extends in the longitudinal direction of the board. Each groove 133 defines a closed space occupied by a gas, such as air. This space results in a reduction in the weight of the board.

  In general, the boards 1, 50, 100 according to the invention are produced from

  materials and according to techniques known to those skilled in the art.

  Of course, the invention is not limited to the examples described above, and includes all

  technical equivalents which may fall within the scope of the claims which follow.

  In particular, each insert can have various shapes. An insert may or may not be symmetrical along a transverse axis of the board. Likewise an insert can be

  symmetrical, or not, along a longitudinal axis of the board.

  Several inserts of the same board can have different shapes. This makes it possible to differentiate the mechanical properties of different parts of the board, laterally and / or longitudinally.

Claims (13)

  1- Gliding or rolling board (1, 50, 100) having a length measured in a longitudinal direction (L) between a first end (2, 51, 101) and a second end (3, 52, 102), a width measured between a first edge (4, 53, 103) and a second 5 edge (5, 54, 104), and a height measured between a lower or sliding face (6, 55, 105) and an upper face (7 , 56, 106), in height the board (1, 50, 100) comprising in particular a first reinforcement (21, 71, 121), a second reinforcement (23, 73, 123), and at least one core (22, 72 , 122) located between the first reinforcement (21, 71, 121) and the second reinforcement (23, 73, 123), the board (1, 50, 100) also having, from the first (2, 51, 101) to the second end (3, 52, 10 102), a first end zone (8, 57, 107), a first intermediate zone (9, 58, 108), a first reception zone (10, 59, 109 ), a central area (11, 60, 110), a second reception area (12, 61, 111) , a second intermediate zone (13, 62, 112), and a second end zone (14, 63, 113), characterized in that the core (22, 72, 122) comprises a matrix (30, 80, 130) made of a filling material, the matrix (30, 80, 15 130) having at least one cavity (32, 83, 84, 132), at least one insert (31, 81, 82, 131)   being housed in the cavity (32, 83, 84, 132) of the matrix (30, 80, 130) in a determined zone of the board, the insert (31, 81, 82, 131) having at least one mechanical property greater than that of the matrix (30, 80, 130), this property possibly being the tensile or compressive strength, the flexural strength, the elastic limit, or the like, so as to locally improve the mechanical properties of the board.   2- board (1, 50, 100) according to claim 1, characterized in that each insert (31, 81, 82, 131) has an elongated shape, the insert (31, 81, 82, 131) being oriented   substantially in the longitudinal direction (L) of the board (1, 50, 100).   3- board (1, 100) according to claim 1 or 2, characterized in that it comprises an insert (31, 131), the insert (31, 131) being located substantially halfway between the first   (4, 103) and second (5, 104) side edges.   4- board (1) according to one of claims 1 to 3, characterized in that the insert (31,   131) extends continuously from the first reception area (10, 109) to the second reception area (12, 111).   5- board (1) according to one of claims 1 to 4, characterized in that a cavity   through (32) is formed in the matrix (30) to accommodate the insert (31), the insert (31)   connecting the first (21) and second (23) reinforcements to each other.   6- board (1) according to one of claims 1 to 5, characterized in that in a plane   substantially parallel to the lower face (6) or to the upper face (7), the insert (31) has a rectangular section, and by the fact that in a transverse plane substantially perpendicular to the lower face (6) or to the upper face (7), the insert (31) has a rectangular section.   7- board (1) according to one of claims 1 to 6, characterized in that in a plane   longitudinal substantially perpendicular to the lower face (6) or to the upper face (7),   the insert (31) has a wavy face.   8- Plate (100) according to one of claims 1 to 4, characterized in that the insert   (131) has a parallelepiped shape.   9- Plate (100) according to one of claims 1 to 4 and 8, characterized in that the insert   (131) is housed in a non-through cavity (132) of the matrix (130).   - Board (50) according to claim 1 or 2, characterized in that it comprises a   first side insert (81) and a second side insert (82).   11-Board (50) according to one of claims 1, 2 and 10, characterized in that   each of the inserts (81, 82) extends continuously from the first intermediate zone (58) to the second intermediate zone (62), a first (83) and a second (84) non-through cavities being formed in the matrix (80) to respectively accommodate the inserts (81, 82).   12- Plate (50) according to one of claims 1, 2, 10 and 11, characterized in that   the thickness of each insert (81, 82) is substantially constant, and by the fact that each insert (81, 82) has relatively narrow ends (85, 86, 87, 88) and a center (89, 90) more as wide as the ends.   13- Board (1, 50, 100) according to one of claims 1 to 4 and 6 to 12, characterized in that there is provided in the matrix (130) at least one groove (133).   14. Plate (1, 50, 100) according to one of claims 1 to 13, characterized in that the   matrix (30, 80, 130) is made from a foam of plastic material, and by the fact that   the insert (31, 81, 82, 131) is made with wood.   - Method for making a sliding or rolling board (1, 50), the method 25 comprising a step of manufacturing a core (22, 72), as well as a step of assembling the   constituent elements of the board (1, 50), characterized in that the step of manufacturing the core (22, 72) consists in placing at least one insert (31, 81, 82) in a mold in the shape of the core (22, 72), then in producing a matrix (30, 80) by injecting plastic foam into the mold, the foam extending around the insert (31, 81, 82) to form therewith ci the nucleus (22, 72).