FR2552868A1 - INTRINSICALLY RIGID PROTECTION ELEMENT - Google Patents

Abstract

THE INVENTION CONCERNS AN INTRINSICALLY RIGID PROTECTION ELEMENT, SHAPING MULTIPLE LAYERS, STOPPING PROJECTILES AND / OR SHARDS, PREFERABLY FOR THE PROTECTION OF THE HUMAN BODY OR PARTS THEREOF, IN PARTICULAR A HELMET, COMPRISING AN INNER SHELL 3 IN MATERIAL PLASTIC, A TEXTILE 2 INTERMEDIATE LAYER, AND AN OUTER SHELL 1 IN PLASTIC MATERIAL, THE OUTER SHELL 1 AND THE INNER SHELL 3 BEING CONNECTED BETWEEN THEM ON THEIR PERIPHERAL EDGE AND THE TEXTILE INNER LAYER 2 BEING SOLIDLY FIXED IN A MARGINAL AREA INTERIOR 3.

Description

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  The present invention relates to an intrinsically rigid protective element, formed of several layers, stopping projectiles and / or splinters, preferably for the protection of the human body or parts thereof, consisting of at least one shell. inner rigid material, preferably plastic, an intermediate layer at least partly textile and an outer shell of rigid material, preferably plastic, the outer shell and the inner shell being interconnected on their

peripheral edge.

  Such protective elements, for example helmets, in which the plies of the textile intermediate layer are not impregnated with synthetic resin but are placed dry between the plastic shells, are known. For the textile intermediate layer, proposed among others the use

  several layers of aramid fiber fabric.

  The degree of protection against projectiles or splinters essentially depends on the number of layers of the textile intermediate layer. However, the number of layers of the textile intermediate layer cannot be increased at will, on the one hand, for reasons of cost and , on the other hand, for weight reasons In addition, it has been found that even with a relatively large number of textile tablecloths made of aramid fibers, perforations or excessively large deformations of the

inner shell.

  The object of the invention is therefore to increase the projectile or burst resistance of an element

  protective gear, in particular a helmet of the type defined above.

  This result is obtained in accordance with the invention 35 by the fact that the textile intermediate layer is firmly connected at least in a marginal zone and at least

  in places with only one of the two hulls, preferably the inner hull.

  The effect of stopping projectiles and / or splinters of coated textile products determined such as, for example, aramid fiber fabrics, is obtained on the one hand, by the high resistance or the great energy absorption capacity fibers and, on the other hand also, thanks to a certain damping mobility of the threads or the affected areas of the coated textile product The damping mobility must not however exceed a certain degree because otherwise during impacts it would occur local deformations which are too deep and which could, unlike weaker bumps, endanger the part of the body to be protected and which would furthermore promote the formation of cracks and consequently perforation. Thanks to the features of the invention, it is it is now possible to limit the damping mobility of the textile structure or of the various textile plies of the intermediate layer to the degree

  optimal because now in particular the marginal zone of the textile intermediate layer is advantageously maintained on the inner shell.

  A sufficiently solid connection between the textile intermediate layer and the (inner) shell can advantageously be established by riveting, in which case the spacing of the rivets must not be too small, since otherwise the resistance of the (inner) shell would be too greatly weakened. (perforation effect) This also applies to other mechanical fastening members arranged punctually, such as for example screws, staples or the like. Advantageously, the spacing of the different fastening members must be greater than 4 cm. stitching of the textile intermediate layer with the inner shell, care should be taken

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  analogous to providing corresponding spacings of sizes between the stitching points In addition to a point connection using rivets, etc., o where appropriate in place of this connection, the marginal zone of the textile intermediate layer with the shell (interior) The solid connection of the textile intermediate layer with the interior shell

  is more advantageous than a connection with the outer shell.

  For the inner shell and the outer shell of the protective element, solid and dense materials should be used, in particular materials having a low specific weight, since the protective element must not be too heavy First of all therefore plastics can be used

  (reinforced or unreinforced) as hull manufacturing materials, especially hard plastics.

  As hard plastics, the most different duroplasts can be mentioned, for example, and plastics which are in a hard and elastic condition at the temperature of use (below the freezing point), but also also partially crystalline, harder, tough and elastic plastics, for example polyamide. A particularly advantageous example of a hard plastic material is a polycarbonate having a strand hardness close to 100 N / mm and a modulus of elasticity of 2300 N / mm 2 The shells can be formed from a

  or more layers The inner shell may also have localized recesses.

  Essentially when the shells are made of plastic, the intermediate layer constitutes the element for stopping projectiles or splinters proper or at least essential. The intermediate layer 35 then advantageously consists of several layers of a coated textile product. It is advantageous that the layers of the coated textile product are composed at least in major

  part of yarns or fibers of aramid or Polyamide 6 6.

  By the expression "coated textile products", is meant all the products which are in the form of a web and consist of textile fibers, such as for example

  fabrics, braids, knits, knitted fabrics, mesh products, non-woven fabrics or others.

  Depending on the shape of the protective element, it is advantageous for the different plies of a coated textile product to consist of several segments connected to each other by seams. It is advantageous that the

  tablecloths of coated textile products are connected to each other in a punctual or linear fashion by sewing, by gluing or by stapling.

  Between the textile tablecloths of the intermediate layer and the inner shell, an insert formed of an elastically compressible material can be placed which fills without gap the intermediate volume existing between the textile tablecloths and the shell. The insert of elastically compressible material can advantageously consisting of an expanded material, in particular a soft expanded material, based on plastic or rubber. It is also suitable to use elastomers or similar elastically deformable plastics. The insert of elastically compressible material can consist of one or however also of several partial layers It is advantageous that the insert formed of an elastically compressible material is incorporated in a condition of prestress in compression This result can be obtained in the best way when a prefabricated insert , which is oversized in thickness, is compressed when the shell is joined ex with the inner shell, or also by ensuring that, after the inner shell and the outer shell have been bonded, the interior volume existing between the layers of the lapped textile product and the shell is subsequently subjected to formation

of foam.

  In particular, the arrangement and in particular also the succession and the number of the layers or partial layers of the inner layer (in which case

  we mean all the materials arranged between the outer shell and the inner shell) can be chosen in accordance with existing requirements.

  Other characteristics and advantages of the present invention will be highlighted in the following.

  the description, given by way of nonlimiting example,

  reference to the accompanying drawings in which: Figure 1 shows a helmet in vertical section; FIG. 2 represents on an enlarged scale a part A of the side wall of the helmet, and

  Figure 3 shows on an enlarged scale a part B of the marginal zone of the helmet.

  The helmet shown consists of an outer shell 1 of hard plastic material, for example polycarbonate, of a textile intermediate layer 2 formed from a few (for example from eight to sixteen) plies 25 of aramid fabric, and an inner shell 3 also made of hard plastic, for example polycarbonate The various plies of the textile intermediate layer 2 are sewn together As a whole, the textile intermediate layer 2 is riveted in the marginal zone of the helmet with the inner shell made of plastic About fourteen rivets 4 are distributed over

the periphery of the helmet.

  In a peripheral peripheral zone, the inner shell 3 of plastic material has a wire 5 in the form of a channel, which is open towards the peripheral edges of the other layers 1, 2 of the helmet. The outer shell 1 of plastic material is hooked by its free peripheral edge 6 in the profile 5 in the form of a channel, the thickened edge 6 of the shell 1 of plastic material hanging behind the wing 7, curved inwards, of the profile 5 in the form of a channel La mobility of the free edge of the outer shell 1 in the direction of the inner shell 3 is limited by the rib 8, to prevent the free edge 6 from coming up out of the profile 5 in the form of a channel and that the outer shell 1 can be lift from the rest of the helmet layers The mobile marginal link shown also allows a torsional movement of the outer shell 1 relative to the inner shell 3 around the vertical axis 9 (Fig 1) of the helmet, this movement being however limited p ar following the shape of the helmet which conventionally has no symmetry of revolution with respect to the axis 9 It is also possible to have between the wing 7 of the profile 5 and the free edge 6 of the outer shell 1 of plastic material a seal sealing in elastomeric material, for example in silicone elastomer, not impeding the complete mobility of the

marginal bond.

  The interior equipment 10 of the helmet (only 25 shown diagrammatically) is fixed to the wall of the helmet by means of four screw connections, in which case a screw is used

with head 11 with a nut 12.

  As fields of application of the invention, we

  may cite apart from helmets, for example, motor vehicle coatings, stationary or portable protective shields, or similar objects.

  1 Intrinsically rigid protective element, formed of several layers, stopping projectiles and / or splinters, preferably for the protection of the human body or parts thereof, consisting of at least one inner shell made of rigid material, preferably plastic, an intermediate layer at least partly textile and an outer shell of rigid material, preferably plastic, the outer shell and the inner shell being interconnected on their peripheral edge, characterized in that the textile intermediate layer (2) is firmly connected at least in a marginal area

  and at least in places with only one of the two shells (1, 3), preferably the inner shell (3).

  2 protective element according to claim 1, characterized in that the textile intermediate layer (2) is firmly connected in a punctual manner with the inner shell or the outer shell (1,3), preferably

at intervals of at least 4 cm.

  3 protective element according to claim 1 or 2, characterized in that the intermediate layer (2) is mechanically connected, preferably by riveting,

  with the inner shell or the outer shell (1,3).

  4 Protection element according to any one

  claims 1 to 3, characterized in that the layer

  textile intermediate (2) is fixed (additionally) by gluing on the inner shell or the outer shell

(1.3).