FR3086847A1 - HELMET AND MANUFACTURING METHOD THEREOF - Google Patents

Abstract

The present invention relates to a helmet (100) comprising at least a first part (110, 120, 130, 140) and a second part (110, 120, 130, 140) characterized in that each of the first (110, 120, 130 , 140) and second (110, 120, 130, 140) parts includes: • An internal face formed of an internal layer; • An external face formed of an external layer; • A spacer layer having a honeycomb structure and being disposed between the inner layer and the outer layer; • At least one beveled edge (151, 152, 161, 162, 171, 172, 181, 182); • The first part (110, 120, 130, 140) and the second part (110, 120, 130, 140) being configured to be integral with one another by fixing their bevelled edge (151, 152, 161 , 162, 171, 172, 181, 182) with each other.

Description

TECHNICAL FIELD OF THE INVENTION

The present invention relates to the field of helmets in general, and more particularly to helmets for motor vehicles.

STATE OF THE ART

The helmet industry has seen many evolutions, all generally linked to advances in materials science.

Indeed, the discovery of a new material generally leads to its use in the field of helmets as long as it has increased resistance or reduced density.

Thus, with the emergence of multilayer materials, helmets have experienced many revolutions, seeing their weight decrease while retaining excellent mechanical impact resistance properties.

These materials, although having interesting properties for the field of helmets, also present problems of conformation or even design, thus resulting in costly modifications of the helmet manufacturing processes or even, for certain materials, impossibilities of implementation.

Consequently, the high cost or the technical difficulties of implementation lead to the non-exploitation, in particular on an industrial scale, of materials with exceptional mechanical properties.

The present invention aims to at least partially solve the problems set out above.

SUMMARY OF THE INVENTION

The present invention relates to a helmet, preferably a vehicle with two and four wheels, comprising at least a first part and a second part, characterized in that each of the first and second parts comprises:

• An internal layer having an internal face intended to be turned facing the head of a user;

• An outer layer having an outer face opposite the inner face, intended to be turned towards the outside of the helmet;

• A spacer layer having a honeycomb structure and being disposed between the inner layer and the outer layer;

• At least one bevelled edge being defined by at least part of the internal face or the external face;

• The first part and the second part being configured to be integral with each other by fixing the beveled edge of the first part with the beveled edge of the second part so as to define a first contact interface between the first part and the second part.

The present invention makes it possible to produce a helmet from stacks of layers and of material not allowing a conformation into a helmet according to the methods of the prior art.

The present invention makes it possible to produce a lighter helmet for an impact resistance equal to helmets of the same category of impact resistance.

The present invention makes it possible to avoid technical constraints in the manufacture of helmets based on stacked layers. Indeed, the present invention simplifies and solves this problem by making a helmet from a plurality of parts manufactured independently of each other from stacks of layers.

The manufacturing cost is thus reduced.

The present invention makes it possible to use stacks of thin layers which also makes it possible to design helmets whose structure is more elegant, thinner while retaining the protective property that a helmet must have.

The present invention also relates to a method of manufacturing at least part of a helmet according to the present invention comprising at least the following, preferably successive, steps:

• Arrangement of a primary layer taken from the inner layer and the outer layer, in a first part of a first mold comprising at least one bevelled surface configured to define at least said bevelled edge of said part;

• Arrangement of the spacer layer above the primary layer, preferably at least partially in contact with the primary layer;

• Arrangement of a second part of the first mold above the spacer layer, preferably in contact at least in part with the spacer layer, the second part of the first mold having a shape that is at least partially complementary to the first part of the first mold;

• Application of a first pressure on the first and / or the second part of the first mold so as to join, and preferably to conform, the primary layer and the spacer layer;

• Removal of the second part of the first mold;

• Provision of a secondary layer, the secondary layer being the other among the inner layer and the outer layer above the spacer layer, preferably in contact at least in part with the spacer layer;

• Arrangement of the second part of the first mold above the secondary layer, preferably at least partly in contact with the secondary layer;

• Application of a second pressure on the first and / or second part of the first mold so as to join, and preferably to conform, the spacer layer and the secondary layer, and so as to form at least in part the beveled edge of said part;

• Removal of the second part of the first mold.

The present invention also relates to a method of manufacturing at least one helmet according to the present invention from at least a first part of the helmet obtained according to the method according to the present invention and from at least a second part of the helmet obtained according to the present invention, said manufacturing process comprising the following successive steps:

• Arrangement of at least one first adhesive element on at least part of the beveled edge of the first part and / or on at least part of the beveled edge of the second part;

• Fixing the first part with the second part by applying at least part of the beveled edge of the first part to the beveled edge of the second part.

The present invention also relates to a method for partially manufacturing at least one helmet according to the present invention comprising at least the following steps:

at. Manufacture of a first part of said helmet comprising at least the following, preferably successive, steps:

i. Arrangement of an internal layer in a first part of a first mold comprising at least one beveled surface configured to define at least one beveled edge of the first part;

ii. Provision of a spacer layer above the inner layer, preferably in contact at least in part with the inner layer;

iii. Arrangement of a second part of the first mold above the spacer layer, preferably in contact at least partly with the spacer layer, the second part of the first mold having a shape partly at least complementary to the first part of the first mold;

iv. Application of a first pressure on the first and / or second part of the first mold so as to join, and preferably to conform, the internal layer and the spacer layer and so as to form at least in part the bevelled edge ;

v. Removal of the second part of the first mold;

vi. Provision of an outer layer above the spacer layer, preferably in contact at least in part with the spacer layer;

vii. Arrangement of the second part of the first mold above the external layer, preferably in contact at least partly with the external layer;

viii. Application of a second pressure on the first and / or second part of the first mold so as to secure, preferably to conform, the spacer layer and the outer layer;

ix. Removal of the second part of the first mold.

b. Manufacture of a second part of said helmet comprising at least the following, preferably successive, steps:

x. Arrangement of an internal layer in a first part of a second mold comprising at least one beveled surface configured to define at least one beveled edge of the second part;

xi. Provision of a spacer layer above the inner layer, preferably in contact at least in part with the inner layer;

xii. Arrangement of a second part of the second mold above the second layer, preferably in contact at least partly with the spacer layer, the second part of the second mold having a shape partly at least complementary to the first part of the second mold;

xiii. Application of a third pressure on the first and / or second part of the second mold so as to secure, and preferably to conform, the internal layer and the spacer layer;

xiv. Removal of the second part of the second mold;

xv. Provision of an outer layer above the spacer layer, preferably in contact at least in part with the spacer layer;

xvi. Arrangement of the second part of the second mold above the external layer, preferably at least partly in contact with the external layer;

xvii. Application of a fourth pressure on the first and / or second part of the second mold so as to join, and preferably to conform, the spacer layer and the external layer and so as to form at least in part the bevelled edge of the second part;

xviii. Removal of the second part of the second mold.

vs. Assembly of the first part and the second part comprising at least the following steps, preferably successive:

xix. Arrangement of at least one first adhesive element on at least part of the beveled edge of the first part and / or on at least part of the beveled edge of the second part;

xx. Joining of the first part with the second part by bringing at least part of the beveled edge of the first part into contact with at least part of the beveled edge of the second part through at least part of the first adhesive element .

The present invention also relates to a helmet, preferably a motor vehicle, comprising at least a first part and a second part, characterized in that:

at. The first part comprises a first stack of layers, the first stack of layers comprising at least a first layer, a second layer and a third layer, preferably the second layer being located between the first and third layers and having a honeycomb structure. 'bee;

b. The second part comprises a second stack of layers, the second stack of layers comprising at least a fourth layer, a fifth layer and a sixth layer, preferably the fifth layer being located between the fourth and sixth layers and having a honeycomb structure. 'bee;

vs. The first part comprises at least a first bevelled edge comprising a first joining surface, preferably defined at least in part by at least a part of the first layer;

d. The second part comprises at least a second bevelled edge comprising a second joining surface, preferably defined in part at least by at least part of the sixth layer;

e. The first part and the second part are joined to one another by joining the first joining surface with the second joining surface defining a first contact interface.

The present invention also relates to a method of manufacturing at least part of a helmet according to the present invention comprising at least the following steps, preferably successive:

at. Arrangement of the first layer in a first part of a first mold comprising at least one bevelled surface configured to define at least the first joining surface;

b. Arrangement of the second layer above the first layer, preferably in contact at least in part with the first layer;

vs. Arrangement of a second part of the first mold above the second layer, preferably in contact at least in part with the second layer, the second part of the first mold having a shape partly at least complementary to the first part of the first mold;

d. Application of a first pressure on the first and / or second part of the first mold so as to secure, and preferably to conform, the first layer and the second layer;

e. Removal of the second part of the first mold;

f. Arrangement of the third layer above the second layer, preferably at least partly in contact with the second layer;

g. Arrangement of the second part of the first mold above the third layer, preferably in contact at least in part with the third layer;

h. Application of a second pressure on the first and / or second part of the first mold so as to join, and preferably to conform, the second layer and the third layer, and so as to form in part at least the first surface of joining at said beveled surface;

i. Removal of the second part of the first mold.

The present invention also relates to a method of manufacturing at least one helmet according to the present invention from at least a first part of helmet obtained according to the method according to the present invention and from at least a second part of helmet obtained according to the method according to the present invention, said manufacturing method comprising at least the following steps:

at. Arrangement of at least a first adhesive element on at least part of a first joining surface carried by the first part and / or on at least part of a second joining surface carried by the second part;

b. Joining of the first part with the second part by bringing at least part of the first joining surface into contact with at least part of the second joining surface through at least part of the first adhesive element.

The present invention finally relates to a method of manufacturing at least part of a helmet according to the present invention comprising at least the following steps:

at. Manufacture of a first part of said helmet comprising at least the following, preferably successive, steps:

i. Arrangement of the first layer in a first part of a first mold comprising at least one bevelled surface configured to define at least the first joining surface;

ii. Arrangement of the second layer above the first layer, preferably in contact at least in part with the first layer;

iii. Arrangement of a second part of the first mold above the second layer, preferably in contact at least in part with the second layer, the second part of the first mold having a shape partly at least complementary to the first part of the first mold;

iv. Application of a first pressure on the first and / or second part of the first mold so as to join, and preferably to conform, the first layer and the second layer and so as to form in part at least the first joining surface at said beveled surface;

v. Removal of the second part of the first mold;

vi. Arrangement of the third layer above the second layer, preferably at least partly in contact with the second layer;

vii. Arrangement of the second part of the first mold above the third layer, preferably in contact at least in part with the third layer;

viii. Application of a second pressure on the first and / or the second part of the first mold so as to join, and preferably to conform, the second layer and the third layer;

ix. Removal of the second part of the first mold.

b. Manufacture of a second part of said helmet comprising at least the following, preferably successive, steps:

x. Arrangement of the fourth layer in a first part of a second mold comprising at least one bevelled surface configured to define at least the second joining surface;

xi. Arrangement of the fifth layer above the fourth layer, preferably in contact at least in part with the fourth layer;

xii. Arrangement of a second part of the second mold above the second layer, preferably in contact at least partly with the fifth layer, the second part of the second mold having a shape partly at least complementary to the first part of the second mold;

xiii. Application of a third pressure on the first and / or second part of the second mold so as to secure, and preferably to conform, the fourth layer and the fifth layer;

xiv. Removal of the second part of the second mold;

xv. Arrangement of the sixth layer above the fifth layer, preferably in contact at least in part with the fifth layer;

xvi. Arrangement of the second part of the second mold above the sixth layer, preferably in contact at least in part with the sixth layer;

xvii. Application of a fourth pressure on the first and / or second part of the second mold so as to join, and preferably to conform, the fifth layer and the sixth layer and so as to form in part at least the second joining surface at said beveled surface;

xviii. Removal of the second part of the second mold.

vs. Assembly of the first part and the second part comprising at least the following steps, preferably successive:

xix. Arrangement of at least one first adhesive element on at least part of the first joining surface and / or on at least part of the second joining surface;

xx. Joining of the first part with the second part by bringing at least part of the first joining surface into contact with at least part of the second joining surface through at least part of the first adhesive element.

BRIEF DESCRIPTION OF THE FIGURES

The aims, objects, as well as the characteristics and advantages of the invention will emerge better from the detailed description of an embodiment of the latter which is illustrated by the following accompanying drawings in which:

- Figure 1 illustrates the two parts of a mold according to an embodiment of the present invention.

- Figure 2 schematically illustrates the two parts of a mold according to an embodiment of the present invention.

- Figures 3a to 3d schematically illustrate a succession of steps for manufacturing a first part of a helmet according to an embodiment of the method according to the present invention.

- Figures 4a to 4d schematically illustrate a succession of steps for manufacturing a second part of a helmet according to an embodiment of the method according to the present invention.

- Figure 5 shows a sectional view of a stack of layers according to an embodiment of the present invention.

- Figures 5a and 5b illustrate a contact interface according to two embodiments of the present invention.

- Figures 6a to 6d schematically illustrate a succession of steps for securing different parts of a helmet according to an embodiment of the method according to the present invention.

- Figures 7a to 7e show a helmet according to an embodiment of the present invention.

The accompanying drawings are given as examples and are not limitative of the invention. These drawings are schematic representations and are not necessarily to the scale of practical application.

DETAILED DESCRIPTION OF THE INVENTION

The term “beveled edge” means an edge, for example cut obliquely, and not at a right angle.

The term "nature" of a material means its chemical composition and / or its structure. Thus two layers can be of the same chemical composition, but of a different nature from a structural point of view.

The term “honeycomb structure” is understood to mean a honeycomb structure, for example obtained from an expansive foam. In particular, a honeycomb structure may include cells organized in a periodic network or, on the contrary, cells randomly arranged in a volume. Preferably, a honeycomb structure has an amount less than the amount of alveolar space.

In the following description, the thicknesses are generally measured in directions perpendicular to the plane of the underside of the layer considered. In particular, the thicknesses are preferably measured according to the normal to the tangent at the point of measurement of the lower or upper face of the layer considered. Thus, the thicknesses are generally taken in a vertical direction in the figures shown.

It is specified that in the context of the present invention, the terms "above", "on", "overcomes", "covers" or "underlying" or their equivalents do not mean "in contact with". For example, a second layer placed above a first layer does not necessarily mean that the two layers are in direct contact with each other, but it does mean that the second layer at least partially covers the first layer by being either directly in contact with it, either by being separated from it by at least one other layer or at least one other element, for example a resin.

Unless otherwise specified, technical characteristics described in detail for a given embodiment can be combined with technical characteristics described in the context of other embodiments described by way of example and not limitation.

In the following description, similar reference numerals will be used to describe similar concepts through different embodiments of the invention.

Before starting a detailed review of embodiments of the invention, there are set out below optional features which can optionally be used in combination or alternatively:

- According to one embodiment, the internal layer consists of the first layer or the fourth layer;

- According to one embodiment, the outer layer consists of the third layer, preferably with a third additional layer, or the sixth layer, preferably with a sixth additional layer;

- According to one embodiment, the spacer layer consists of the second layer or the fifth layer;

- According to an example, the first layer is the inner layer.

- According to an example, the second layer is the spacer layer.

- According to an example, the third layer is the outer layer.

- According to an example, the fourth layer is the internal layer.

- According to an example, the fifth layer is the spacer layer.

- According to an example, the sixth layer is the outer layer.

Advantageously, the first part and the second part are configured to cooperate with each other so that when a mechanical force is exerted at the first contact interface, at least part of the force is transferred to the first part and / or to the second part.

This increases the mechanical resistance of the first contact interface.

Advantageously, the normal of the first joining surface is inclined at an angle different from 90 ° relative to the normal to the surface of one of the first layer and the third layer outside the first contact interface.

Advantageously, the normal of the second joining surface is inclined at an angle different from 90 ° relative to the normal to the surface of one of the fourth layer and the sixth layer outside the first contact interface.

Advantageously, the first joining surface has a first angle of inclination relative to the normal to the tangent of the surface of the first layer outside the first contact interface of between 15 ° and 85 °, preferably between 30 ° and 60 °, and advantageously equal to 45 °. This makes it possible to reinforce the structure at the level of the joining zones in the event of impacts. The inclination of the surfaces ensures a better distribution of forces in the event of an impact.

Advantageously, the second joining surface has a second angle of inclination relative to the normal to the tangent of the surface of the sixth layer outside the first contact interface between 15 ° and 85 °, preferably between 30 ° and 60 °, and advantageously equal to 45 °.

This makes it possible to reinforce the structure at the level of the joining zones in the event of impacts. The inclination of the surfaces ensures a better distribution of forces in the event of an impact.

Advantageously, the projection, in a plane tangent to the surface of the first contact interface, of the first contact interface between the first connection surface and the second connection surface is not zero.

Advantageously, the ratio between the thickness of the first part and / or of the second part with the lateral extension of the projection is between 0.3 and 3.

Advantageously, the ratio between the thickness of the first part outside the first contact interface and the thickness of the first part at the level of the first contact interface is greater than 1, preferably greater than 1.5 and advantageously greater or equal to 2, the thicknesses being measured according to the normal to the tangent at the measurement point of the upper face of the third layer.

Advantageously, the ratio between the thickness of the second part outside the first contact interface and the thickness of the second part at the level of the first contact interface is greater than 1, preferably greater than 1.5 and advantageously greater or equal to 2, the thicknesses being measured according to the normal to the tangent at the measurement point of the lower face of the fourth layer.

Advantageously, the thickness of the first contact interface is equal to the thickness of the first part and to the thickness of the second part, the thickness of the first contact interface being measured according to the normal to the tangent to the measuring point of the upper face of the third layer or of the lower face of the fourth layer, the thickness of the first part being measured according to the normal to the tangent at the measuring point of the lower face of the first layer and l thickness of the second part being measured according to the normal to the tangent at the measurement point of the underside of the fourth layer.

This makes it possible to maintain a uniform thickness at the level of the joining zones and of the parts of the helmet.

Advantageously, the thickness of the second layer is greater than the thickness of the first layer and that of the third layer, the thicknesses being measured according to the normal to the tangent at the measurement point of the lower face of the layer considered .

Advantageously, the thickness of the fifth layer is greater than the thickness of the fourth layer and that of the sixth layer, the thicknesses being measured according to the normal to the tangent at the measurement point of the lower face of the layer considered .

Advantageously, the second layer and the fifth layer each comprise at least one material having a honeycomb structure taken from at least: Aluminum, plastic, thermoplastic, Nomex, any type of foam or any type of cellular material.

Advantageously, the first layer and the fourth layer each comprise at least one material taken from at least: carbon fibers, glass fibers, synthetic fibers, vegetable fibers, or any type of fiber.

Advantageously, the third layer and the sixth layer each comprise at least one material taken from at least: carbon fibers, glass fibers, synthetic fibers, vegetable fibers, or any type of fiber.

Advantageously, the first part and the second part are configured to be arranged on either side of the head of a user relative to his sagittal plane.

- Advantageously, the helmet according to the present invention comprises at least a third part configured to be arranged above the top of the head of the user.

Advantageously, each part of the helmet is secured to at least two other parts of the helmet.

- Advantageously, the helmet according to the present invention comprises at least a fourth part intended to form a chin rest.

Advantageously, the helmet according to the present comprises a first contact interface, a second contact interface, a third contact interface and a fourth contact interface.

This allows a helmet to be made in several parts from different layers of layers and in different molds. This makes it possible to avoid certain known technical limitations for the production of a helmet from a single mold.

Advantageously, the first securing surface is flat relative to the surface of the first part of the helmet which is curved.

This allows a better surface finish for bonding.

Advantageously, the second joining surface is flat relative to the surface of the second helmet part which is curved. This allows a better surface finish for bonding.

Advantageously, the second layer has a density of less than 0.1, preferably 0.05 and advantageously 0.03.

This allows for a lighter and more resistant helmet at the same time.

Advantageously, the fifth layer has a density of less than 0.1, preferably 0.05 and advantageously 0.03.

This allows for a lighter and more resistant helmet at the same time.

Advantageously, the second layer has a cellular density of less than 0.1, preferably less than 0.05 and advantageously less than 0.03.

This allows for a lighter and more resistant helmet at the same time.

Advantageously, the fifth layer has a cellular density less than 0.1, preferably less than 0.05 and advantageously less than 0.03.

This allows for a lighter and more resistant helmet at the same time.

- According to one embodiment, the first joining surface has a radius of curvature greater than the average radius of curvature of the first part.

- According to one embodiment, the second joining surface has a radius of curvature greater than the average radius of curvature of the second part.

- According to one embodiment, the ratio between the surface of the first layer and the surface of the first joining surface is greater than 5, preferably 10 and advantageously 20.

- According to one embodiment, the ratio between the surface of the sixth layer and the surface of the second joining surface is greater than 5, preferably 10 and advantageously 20.

- According to one embodiment, the ratio between the thickness of the second layer and the thickness of the first layer is greater than 1, preferably 2 and advantageously 5 outside the first contact interface.

- According to one embodiment, the ratio between the thickness of the fifth layer and the thickness of the fourth layer is greater than 1, preferably 2 and advantageously 5 outside the first contact interface.

- According to one embodiment, the ratio between the thickness of the second layer and the thickness of the third layer is greater than 1, preferably 2 and advantageously 5 outside the first contact interface.

- According to one embodiment, the ratio between the thickness of the fifth layer and the thickness of the sixth layer is greater than 1, preferably 2 and advantageously 5 outside the first contact interface.

Advantageously, the first layer and the fourth layer each comprise at least one material taken from at least: carbon fibers, glass fibers, synthetic fibers, vegetable fibers, or any type of fiber.

Advantageously, the second layer and the fifth layer each comprise at least one honeycomb material.

Advantageously, the third layer and the sixth layer each comprise at least one material taken from at least: carbon fibers, glass fibers, synthetic fibers, vegetable fibers, etc.

The fibers make it possible to reinforce the resistance of the helmet to impacts with a point or blade-shaped element.

Advantageously, the first adhesive element is taken from at least: an adhesive based on polyurethanes, an adhesive based on epoxies, an adhesive based on acrylics, an adhesive based on cyanoacrylates, an adhesive based on anaerobes , an adhesive based on hot-melt fuses.

Advantageously, the thickness of the first layer is less than or equal to the thickness of the third layer.

Advantageously, the thickness of the fourth layer is less than or equal to the thickness of the sixth layer.

Advantageously, the first layer, the third layer, the fourth layer and the sixth layer comprise at least one material of the same nature.

Advantageously, at least one of the first layer and the third layer is impregnated with a resin.

Advantageously, at least one of the fourth layer and the sixth layer is impregnated with a resin.

Advantageously, the first contact interface comprises at least a first adhesive element configured to join the first joining surface to the second joining surface.

Advantageously, the helmet according to the present invention comprises at least a third part and at least a fourth part.

Advantageously, each part of the helmet is secured to at least two other parts of the helmet.

Advantageously, the helmet according to the present invention comprises at least a second contact interface, at least a third contact interface and at least a fourth contact interface.

Advantageously, the first pressure is applied by means of a weight of between 5 tonnes and 60 tonnes, preferably between 15 tonnes and 45 tonnes and advantageously equal to 30 tonnes.

Advantageously, the second pressure is applied by means of a weight of between 5 tonnes and 60 tonnes, preferably between 15 tonnes and 45 tonnes and advantageously equal to 30 tonnes.

Advantageously, the third pressure is applied by means of a weight of between 5 tonnes and 60 tonnes, preferably between 15 tonnes and 45 tonnes and advantageously equal to 30 tonnes.

Advantageously, the fourth pressure is applied by means of a weight of between 5 tonnes and 60 tonnes, preferably between 15 tonnes and 45 tonnes and advantageously equal to 30 tonnes.

Advantageously, the method according to the present invention comprises, before the step of disposing the secondary layer above the spacer layer, a step of disposing of a resin on at least part of the spacer layer.

Advantageously, the method according to the present invention comprises a step of heating the primary layer and / or the spacer layer to a first temperature when the second part of the mold is placed above the spacer layer, preferably at least partly in contact with the spacer layer.

This allows better conformation of the layers and better adhesion of the layers to each other.

Advantageously, the method according to the present invention comprises a step of heating the spacing layer and / or the secondary layer to a second temperature when the second part of the mold is placed above the secondary layer, preferably at at least partly contact with the secondary layer.

This allows better conformation of the layers and better adhesion of the layers to each other.

Advantageously, the first temperature is between 50 ° C and 150 ° C, preferably between 80 ° C and 120 ° C and advantageously between 100 ° C and 120 ° C.

Advantageously, the second temperature is between 50 ° C and 150 ° C, preferably between 80 ° C and 120 ° C and advantageously between 100 ° C and 120 ° C.

Advantageously, the method according to the present invention comprises at least one step of impregnating the primary layer and / or the secondary layer with at least one resin.

Advantageously, the beveled edge of the first part is glued to the beveled edge of the second part. Advantageously, the beveled edge extends from the external face towards, and preferably up to, the internal face or from the internal face. towards, and preferably up to, the external face.

Advantageously, the beveled edge forms an acute angle and an obtuse angle with the internal and external faces, the acute angle being between 15 ° and 85 °, preferably between 30 ° and 60 °, and advantageously equal to 45 °.

- Advantageously, the obtuse angle is preferably equal to 180 ° minus the value of the acute angle.

- According to one example, the beveled edge defines an angle of inclination with the normal to the tangent of the surface of the inner layer outside the first contact interface of between 15 ° and 85 °, preferably between 30 ° and 60 °, and advantageously equal to 45 °.

- Each of the layers has an inclined wall parallel to the first interface between the first and the second part. Thus, each of the layers has a beveled surface.

Advantageously, the first and the second part have homogeneous thicknesses outside the first contact interface.

The thickness is taken at any point of the stack in a direction normal to the tangent to said point. This allows the helmet to be produced with a process of deformation of a stack formed of plane layers.

Advantageously, the beveled edge of the first part and the beveled edge of the second part cooperate so as to define, when the first part and the second part are joined, a surface continuity, preferably without protruding part, between the first part and the second part.

Advantageously, the projection, in a plane tangent to the surface of the first part or of the second part, of the first contact interface is not zero and preferably this projection is between 0.5 and 1.5 times a thickness of the first part or of the second part, this thickness being measured less than two centimeters from said interface and in a direction tangent to the surface of the first contact interface.

Advantageously, the ratio between the thickness of the first part outside the first contact interface and the thickness of the first part at the level of the first contact interface is greater than 1, preferably greater than 1.5 and advantageously greater or equal to 2, the thicknesses being measured according to the normal to the tangent at the measurement point of the internal face or of the external face of the first part.

Advantageously, the ratio between the thickness of the second part outside the first contact interface and the thickness of the second part at the level of the first contact interface is greater than 1, preferably greater than 1.5 and advantageously greater or equal to 2, the thicknesses being measured according to the normal to the tangent at the measurement point of the internal face or of the external face of the second part.

Advantageously, the sum of the thickness of the first part at the level of the first contact interface and the thickness of the second part at the level of the first contact interface is equal to the thickness of the first part outside of the first contact interface and of the second part outside the first contact interface, the thicknesses being measured according to the normal to the tangent at the measurement point of the internal face.

Advantageously, the thickness of the spacer layer is greater than the thickness of the internal layer and that of the external layer, the thicknesses being measured according to the normal to the tangent at the measurement point of the internal face and of the outer face respectively.

Advantageously, the spacer layer comprises at least one material having a honeycomb structure taken from at least: Aluminum, plastic, Nida, Nomex, any type of foam or any type of cellular material.

Advantageously, the internal layer comprises at least one material taken from at least: carbon fibers, glass fibers, synthetic fibers, vegetable fibers or any type of fiber.

Advantageously, the outer layer comprises at least one material taken from at least: carbon fibers, glass fibers, synthetic fibers, vegetable fibers or any type of fiber.

Advantageously, the helmet according to the present invention comprises at least:

o a left sagittal part intended to cover at least partially the left occipital part of the skull of a user, o a right sagittal part intended to cover at least partially the right occipital part of the skull, o a summit part intended for covering at least part of the top of the user's skull, o and said first part and said second part are taken from: the left sagittal part, the right sagittal part and the summit part.

Advantageously, the left sagittal part, the right sagittal part and the summit part form two by two said first part and said second part.

Thus, the left sagittal part, the right sagittal part and the summit part each have the characteristics of said first part or of said second part.

Advantageously, the left sagittal part, the right sagittal part and the summit part form two by two said first part and said second part, so that:

o the left sagittal part and the right sagittal part together define said first contact interface, and o the left sagittal part and the top part together define said first contact interface, and o the right sagittal part and top part together define said first interface contact interface.

Advantageously, the helmet according to the present invention comprises at least:

o a left sagittal part intended to cover at least partially the left occipital part of the skull of a user, o a right sagittal part intended to cover at least partially the right occipital part of the skull of the user, o a chin rest, o and said first part and said second part are taken from: the left sagittal part, the right sagittal part and the chin rest.

Thus, the left sagittal part, the right sagittal part and the chin rest each have the characteristics of said first part or of said second part.

Advantageously, the left sagittal part has a beveled edge fixed to a beveled edge of the right sagittal part.

Advantageously, the left sagittal part has a beveled edge fixed to a beveled edge of the top part.

Advantageously, the right sagittal part has a beveled edge fixed to a beveled edge of the top part.

Advantageously, the helmet according to the present invention comprises at least: a framework intended to cover at least part of the skull of a user, the framework being formed only by the left sagittal part, the right sagittal part, the summit part and possibly by a chin rest.

- Advantageously, the frame is configured to impart most of the rigidity of the helmet. Preferably, the frame is configured to ensure at least 80%, preferably at least 90% and preferably at least 95% of the rigidity of the helmet.

- Advantageously, the frame is configured to impart most of the resistance of the helmet to puncture. Preferably, the frame is configured to ensure at least 80%, preferably at least 90% and preferably at least 95% of the resistance of the helmet to puncture.

Advantageously, the primary layer is the internal layer and the secondary layer is the external layer.

The present invention finds a preferred field of application in the field of helmets, in particular the helmets of two-wheeled vehicles, but also for horse riding without limitation.

The present invention relates to a helmet and its manufacturing process.

Indeed, in order to take advantage of certain materials which will be the subject of a description later, the present invention proposes an innovative helmet as well as its manufacturing process which is just as innovative.

The helmet as described below has equal impact resistance performance if not superior to other helmets of the same impact resistance category. Nevertheless, the helmet according to the present invention has a reduced weight in comparison with helmets of the same category of impact resistance.

The helmet according to the present invention comprises a plurality of parts secured to each other so as to form at least in part, preferably entirely, a frame of said helmet. The helmet can include, in addition to this framework, comfort elements such as foams and / or external layers such as varnish or paint for example.

As presented below, the method according to the present invention comprises forming at least a first part and at least a second part of the helmet, then joining them together.

In the present description, the terms "first layer" and "fourth layer" correspond to an internal layer comprising an internal face intended to be turned opposite the head of a user.

In the present description, the terms "third layer", "third additional layer", "sixth layer" and "sixth additional layer" correspond to an external layer comprising an external face opposite the internal face and intended to be turned towards the outside.

In the present description, the terms "second layer" and "fifth layer" correspond to a spacer layer disposed between the inner layer and the outer layer.

Finally, it will be noted that each of the parts of the helmet according to an embodiment of the present invention comprises at least one beveled edge. This beveled edge comprises at least one securing surface intended to be fixed to the securing surface of the beveled edge of another part of the helmet, thus defining a contact interface between these two parts of the helmet.

Equivalently, we will speak of "bevelled edge" or "joining surface".

The present invention will now be described through the following figures according to one embodiment.

FIG. 1 represents a mold 600 intended to allow the formation of at least part of the helmet 100. In particular, this mold 600 is configured to form the fourth part 140 of the helmet 100 which will be described below with reference to FIGS. 7a to 7th.

According to one embodiment, this mold 600 comprises a first part 610 and a second part 620. The first part 610 and the second part 620 are configured to cooperate together. The second part 620 is shaped so as to have a shape complementary to the shape of the first part 610.

According to one embodiment, the first part 610 of the mold 600 is convex and the second part 620 of the mold 600 is concave.

According to another embodiment, the first part 610 of the mold 600 is concave and the second part 620 of the mold 600 is convex.

Advantageously, the first part 610 and the second part 620 of the mold 600 each comprise at least one bevelled surface 631 and 632 configured to cooperate with each other.

According to another embodiment, only one of the first 610 and the second 620 parts of the mold 600 comprises a bevelled surface 631 or 632.

FIG. 2 schematically illustrates a first mold 300 comprising a first part 310 and a second part 320. The first part 310 is preferably convex and has a first molding surface 311. The second part 320 is preferably concave and has a second surface of molding 321. As described below, but not shown in this figure, the first part 310 and the second part 320 of the first mold 300 each comprise at least one bevelled surface, respectively 331 and 332.

According to one embodiment, the method of manufacturing a helmet 100 according to the present invention comprises at least a plurality of steps which will be described through FIGS. 3a to 6d.

In particular, FIGS. 3a to 3d illustrate, according to one embodiment, the manufacture of the first part 110 of the helmet 100 by means of a first mold 300 and FIGS. 4a to 4d the manufacture of the second part 120 of the helmet 100 by means of a second mold 400 according to one embodiment.

Thus, the method for manufacturing the first part of the helmet 100 according to an embodiment of the present invention comprises at least the following steps, preferably carried out successively:

o Preferably, heating the first part 310 and / or the second part 320 of the first mold 300 to a temperature above 50 ° C., preferably at 100 ° C. and advantageously equal to 140 ° C.

o Preferably waxing at least part of the first part 310 of the first mold 300 and / or the second part 320 of the first mold 300, preferably at least part of the first molding surface 311 and / or the second molding surface 321.

o As illustrated in FIG. 3a, arrangement of a first layer 210 above and in contact with at least part of the first part 310 of the first mold 300, in particular in contact at least in part with the first molding surface 311 of the first part 310 of the first mold 300.

This first layer 210 advantageously comprises at least a plurality of fibers, for example carbon fibers, flax fibers or even synthetic fibers in general.

This first layer 210 has a thickness between 0.1 mm and 1 mm, preferably between 0.2 mm and 0.5 mm and advantageously between 0.2 mm and 0.4 mm.

This first layer 210 is advantageously impregnated with a resin, preferably taken from at least: epoxy, vinylester.

This first layer 210 is intended to be placed facing the head of the user of the helmet 100. This first layer 210 partly forms at least one internal layer of the helmet 100.

It will be noted that the first part 310 of the first mold 300, and preferably the first molding surface 311 comprises at least one first bevelled surface 331. This first bevelled surface 331 is configured to form in part at least the first joining surface 151 of the first part 110 of the helmet 100 to be formed.

o Arrangement of a second layer 220 above and preferably in contact, at least in part, with the first layer 210.

The second layer 220 is also called the spacer layer. Its function is, among other things, to absorb and / or dissipate kinetic energy during an impact. Advantageously and preferably, this second layer 220 has a honeycomb structure. Preferably, the main axis of each hexagon of the honeycomb structure is directed in a direction orthogonal to the surface of the second layer 220 and of the first layer 210, in other words in a direction collinear with the thickness 221 of the second layer 220.

It will be noted that the thickness 221 of the second layer 220 is advantageously greater, and preferably 2 times greater and advantageously 5 times greater than the thickness of the first layer 210.

This second layer 220 has a thickness 221 of between 0.1 mm and 1 mm, preferably between 0.1 mm and 0.5 mm and advantageously between 0.2 mm and 0.4 mm.

The thickness 221 of the second layer 220 is measured between the upper face of the first layer 210 and the lower face of the third layer 230.

o As illustrated in FIG. 3b, arrangement of the second part 320 of the first mold 300 above the second layer 220, and preferably in contact at least in part with the second layer 220.

It will be noted that the second part 320 of the first mold 300 comprises a second beveled surface 332 configured to cooperate with the first beveled surface 331 of the first part 310 of the first mold 300.

o Application of a first pressure 510 on the second part 320 of the first mold 300 in the direction of the first part 310 of the first mold 300 and / or application of a first pressure 510 on the first part 310 of the first mold 300 in the direction of the second part 320 of the first mold 300, so as to conform the first layer 210 and the second layer 220 between the first molding surface 311 and the second molding surface 321.

Advantageously, this first pressure 510 is applied to the second part of the first mold by means of a weight preferably equal to 30 tonnes.

Advantageously, the application of this first pressure 510 lasts between 5 minutes and 120 minutes, preferably between 10 minutes and 45 minutes, and advantageously 30 minutes.

o Preferably, heating the first part 310 of the first mold 300 and / or the second part 320 of the first mold 300 to a first temperature between 40 ° C and 200 ° C, preferably between 60 ° C and 180 ° C and advantageously between 80 ° C and 150 ° C.

This heating step is advantageously carried out at the same time as the application of the first pressure 510.

Advantageously, heating to this first temperature lasts between 5 minutes and 120 minutes, preferably between 5 minutes and 30 minutes, and advantageously between 5 minutes and 15 minutes. This time is preferably a function of the resin used for the impregnation of the first layer.

o Removal of the second part 320 from the first mold 300.

o Preferably, impregnation of the second layer 220 with at least one resin, preferably taken from at least: epoxy, vinylester.

Advantageously, the resin is placed around the periphery of the second layer 220.

o As illustrated in FIG. 3c, arrangement of a third layer 230 above the second layer 220, preferably in contact at least in part with the second layer 220.

This third layer 230 advantageously comprises at least a plurality of fibers, for example carbon fibers, flax fibers or even synthetic fibers in general.

This third layer 230 has a thickness of between 0.1 mm and 2 mm, preferably between 0.2 mm and 0.5 mm and advantageously between 0.2 mm and 0.4 mm.

This third layer is advantageously impregnated with a resin, preferably taken from at least: epoxy, polyurethane, vinyl ester.

According to one embodiment, the third layer 230 is identical in nature to the first layer 210.

This third layer 230 has the function, moreover, of reducing the penetration of a pointed element or forming a blade.

This third layer 230 is also called the outer layer, because it is intended to be placed towards the outside of the helmet 100.

Thus the second layer 220 is arranged between the first layer 210 called the inner layer and the third layer 230 called the outer layer.

o Advantageously, provision of an additional third layer 231 above and preferably in contact at least in part with the third layer 230.

Preferably, this third additional layer 231 is of the same nature as the third layer 230.

It will be noted that the formation of the first joining surface 151 of the first contact interface 150 as well as the first joining surface 161 of the second contact interface 160. These joining surfaces and these joining zones will be described further by the after.

o As illustrated in FIG. 3d, arrangement of the second part 320 of the first mold 300 above the third layer 230, and preferably in contact at least in part with the third additional layer 231.

o As illustrated in FIG. 3d, application of a second pressure 520 on the second part 320 of the first mold 300 in the direction of the first part 310 of the first mold 300 and / or application of a second pressure 520 on the first part 310 of the first mold 300 in the direction of the second part 320 of the first mold 300, so as to conform the third layer 230 and preferably the third additional layer 231 between the second layer 220 and the second molding surface 321.

Advantageously, this second pressure 520 is applied to the second part of the first mold by means of a weight preferably equal to 30 tonnes.

Advantageously, the application of this second pressure 520 lasts between 5 minutes and 120 minutes, preferably between 10 minutes and 45 minutes, and advantageously 30 minutes.

o Preferably, heating the first part 310 of the first mold 300 and / or the second part 320 of the first mold 300 to a second temperature between 40 ° C and 200 ° C, preferably between 60 ° C and 180 ° C and advantageously between 80 ° C and 150 ° C.

This heating step is advantageously carried out at the same time as the application of the second pressure 520.

Advantageously, the heating to this second temperature lasts between 5 minutes and 120 minutes, preferably between 5 minutes and 30 minutes, and advantageously between 5 minutes and 15 minutes. This time is preferably a function of the resin used for the impregnation of the third layer.

o Release of the first stack of layers comprising the first layer 210, the second layer 220 and the third layer 230 and preferably the third additional layer 231.

Advantageously, the first stack of layers is shaped by the first mold 310.

o Preferably, clipping of the first stack so as to form the first part 110 of the helmet 100.

o Preferably, sandblasting of the first part 110 so as to improve the adhesion of the glue, preferably of the first adhesive element, advantageously at the beveled edge.

o Preferably, puttying of the first part 110 with preferably epoxy resin loaded with silica so as to fill the small spokes of the mold.

o Preferably, application of additional pressure on the first part 110 in the first mold 300 so as to reinforce its structure. This additional pressure is applied to the second part of the first mold by means of a weight preferably equal to 30 tonnes. Advantageously, the application of this additional pressure lasts between 5 minutes and 120 minutes, preferably between 10 minutes and 45 minutes, and advantageously 10 minutes.

o Preferably, heating the first part 310 of the first mold 300 and / or the second part 320 of the first mold 300 to a third temperature between 40 ° C and 200 ° C, preferably between 60 ° C and 180 ° C and advantageously between 80 ° C and 150 ° C.

This heating step is advantageously carried out at the same time as the application of the additional pressure.

Advantageously, the heating to this third temperature lasts between 5 minutes and 120 minutes, preferably between 5 minutes and 30 minutes, and advantageously between 5 minutes and 15 minutes. This time is preferably a function of the resin used for the impregnation of the layer or layers.

o Unmolding of the first part 110 of the helmet 100.

According to this method, the first part 110 of the helmet 100 is produced. It thus comprises a first stack of layers. It also comprises at least a first bevelled edge comprising the first joining surface 151. Advantageously, the first part 110 of the helmet 100 is shaped to present at least one first joining surface 151 of the first contact interface 150 described below.

The first part 110 is preferably shaped to present at least one first surface 161 for securing the second contact interface 160 described below.

Advantageously, the first part 110 is shaped to present at least a first connection surface 151 of the first zone 150, a first connection surface 161 of the second zone and a first connection surface 181 of the fourth contact interface 180 .

Preferably, the first part 110 comprises at least two beveled edges, and advantageously comprises 3 beveled edges.

FIGS. 4a to 4d illustrate the preceding steps of the method of manufacturing a part of the helmet 100 for the manufacture of a second part 120 of the helmet 100 according to the present invention.

The method of manufacturing the second part 120 of the helmet 100 comprises, according to one embodiment, the same steps as for the manufacture of the first part 110 of the helmet 100.

However, it will be noted that the second mold 400 may have a first part 410 and a second part 420, only one of which may include at least one beveled surface 432. This beveled surface 432, illustrated in FIG. 4b and carried by the second part 420 of the second mold 400, makes it possible to define the second joining surface 152 of the first contact interface 150. Preferably, this bevelled surface 432 also allows the definition of the first joining surface 171 of the third contact interface 170 described below.

Finally, it will be noted that the third pressure 530 applied as well as the fourth pressure 540 applied may or may not be identical to the first 510 and second 520 pressures applied. The same is true for the temperatures applied.

Likewise, the fourth layer 240 may be identical to or different from the first layer 210. Preferably, the fourth layer 240 comprises the same material as the first layer 210. It is advantageously the same for the fifth layer 250 relative to the second layer 220 and the sixth layer 260 relative to the third layer 230, as well as for the sixth additional layer 261 relative to the third additional layer 231.

In addition to its frame, the helmet can then include additional elements added to the frame. These additional elements may for example be intended to increase comfort or improve the aesthetics or the sealing of the helmet. These elements may for example be foam elements for the interior of the helmet or paints, varnishes or plastic shell to cover the exterior of the helmet.

FIG. 5 represents a sectional view of a stack of layers 200 of the first part 110 or of the second part 120 of the helmet 100. It is thus noted that the stack of layers 200 comprises the first layer 210, preferably made of fibers of carbon, then the second layer 220, preferably honeycomb based on aluminum, plastic or NOMEX for example, then the third layer 230 and the third additional layer 231, both preferably made of carbon fibers .

Advantageously, at least part of these layers is impregnated with a resin.

FIGS. 5a and 5b schematically represent the first contact interface 150.

This first contact interface 150 is preferably defined by the first joining surface 151 and the second joining surface 152.

The first joining surface 151 is carried by a first beveled edge. This first beveled edge is carried by the first part 110 of the helmet 100. The first joining surface 151 is preferably formed by a part of the surface of the first layer 210.

The first joining surface 151 has a first angle of inclination 151b relative to the normal to the tangent of the external face of the first layer 210 at a non-zero distance from the first contact interface 150 of between 15 ° and 85 °, preferably between 30 ° and 60 °, and advantageously equal to 45 °.

The second joining surface 152 is carried by a second beveled edge. This second beveled edge is carried by the second part 120 of the helmet 100. The second joining surface 152 is preferably carried by a part of the surface of the third layer 230, advantageously of the third additional layer 231.

The second joining surface 152 has a second angle of inclination 152b relative to the normal to the tangent of the internal face of the sixth layer 260 at a non-zero distance from the first contact interface 150 of between 15 ° and 85 °, preferably between 30 ° and 60 °, and advantageously equal to 45 °.

Preferably, the second angle of inclination 152b is equal to the first angle of inclination 151b.

In FIG. 5b, the third layer 230 and the third additional layer 231 are inclined and it is a part of the surface of the third additional layer 231 which forms the second joining surface 152.

Also shown in this figure is the lateral extension 154 of the projection, in a plane tangent to the surface of the first contact interface 150, of the first contact interface between the first connection surface 151 and the second connection surface 152 .

Advantageously, this projection is not zero.

Preferably, the first joining surface 151 and the second joining surface 152 are bonded together by an adhesive element taken from at least: an adhesive based on polyurethanes, an adhesive based on epoxies, an adhesive based on acrylic, an adhesive based on cyanoacrylates, an adhesive based on anaerobes, an adhesive based on hot-fuses. Preferably, an adhesive of the type of those used in aeronautics, for example for fixing aircraft wings, will be preferred.

It will be noted that any type of means for securing these two surfaces can be used.

The first contact interface 150 is thus formed by the joining of the first joining surface 151 with the second joining surface 152.

Advantageously, the first joining surface 151 and the second joining surface 152 are configured to allow surface continuity without a projecting part between the first part 110 and the second part 120.

The previous description applies mutatis mutandis to the joining zones 160, 170 and 180 described below.

The method of manufacturing a helmet 100 according to the present invention further comprises a step of joining the first part 110 with the second part 120 by joining, preferably by gluing, the first joining surface 151 of the first interface of contact 150 with the second joining surface 152 of the first contact interface 150 according to what has been described in FIGS. 5a and 5b.

FIGS. 6a to 6d schematically represent the joining of the different parts of a helmet 100 according to the present invention.

Preferably, the helmet 100 according to the present invention comprises at least a first part 110, a second part 120, a third part 130 and a fourth part 140.

Advantageously, each of these parts is produced by the method of manufacturing a part of the helmet 100 according to the present invention as described above.

According to one embodiment, at least two parts of the helmet 100 are formed by the method described above.

It will be noted that the technical characteristics as well as the advantages described above with reference to the first part and to the second part, in particular the layers of layers, the bevelled edges and the manufacturing steps, apply mutatis mutandis to the third and fourth parts. described below.

As illustrated in FIG. 6a and 6c, each of the parts of the helmet comprises at least one, preferably 2 securing surfaces.

Thus, for example, the first part 110, as described above, comprises a first connection surface 151 of the first contact interface 150, a first connection surface 161 of the second contact interface 160 and a first connection surface 181 of the fourth contact interface 180.

The second part 120 comprises a second connection surface 152 for the first contact interface 150, a first connection surface 171 for the third contact interface 170 and a first connection surface 181 for the fourth connection surface 180.

The third part comprises a second fastening surface 162 of the second contact interface 160 and a second fastening surface 172 of the third contact interface 170.

Finally, the fourth part 140 comprises a second joining surface 182 of the fourth contact interface 180.

It will thus be noted that the first part 110 and the second part 120 of the helmet 100 are joined to each other at the level of the first contact interface 150, preferably by bonding of the first joining surface 151 of the first contact interface 150 with the second joining surface 152 of the first contact interface 150.

The first part 110 and the third part 130 of the helmet 100 are joined to one another at the second contact interface 160, preferably by bonding the first joining surface 161 of the second contact interface 160 with the second joining surface 162 of the second contact interface 160.

The first part 110 and the fourth part 140 of the helmet 100 are joined to each other at the level of the fourth contact interface 180, preferably by bonding of the first joining surface 181 of the fourth contact interface 180 with the second joining surface 182 of the fourth contact interface 180.

Likewise, the second part 120 and the third part 130 of the helmet 100 are joined to each other at the third contact interface 170, preferably by bonding the first joining surface 171 of the third interface. contact 170 with the second joining surface 172 of the third contact interface 170.

And finally, the second part 120 and the fourth part 140 of the helmet 100 are joined to one another at the fourth contact interface 180, preferably by bonding the first joining surface 181 of the fourth interface. contact 180 with the second joining surface 182 of the fourth contact interface 180.

Advantageously, each part of the helmet 100 is configured so that no element protrudes from the surface of the joining zones.

According to an embodiment illustrated in FIGS. 6a to 6d, the first part 110 thus defines the left sagittal part of the helmet 100. The first part 110 is intended to cover at least part of the left occipital part of the skull of a user.

The second part 120 thus defines the right sagittal part of the helmet 100. The second part 120 is intended to cover at least part of the right occipital part of the skull of a user.

The third part 130 defines a chin guard of the helmet 100. This third part may be absent according to certain embodiments of the helmet 100 according to the present invention.

The fourth part 140 defines the top part of the helmet 100. The fourth part is intended to cover at least part of the top of the user's skull

Thus, according to an embodiment of the present invention, the helmet 100 comprises a framework intended to cover at least part of the skull of a user. This framework can be formed only by the left sagittal part 110, the right sagittal part 120, the summit part 140 and possibly by a chin rest 130.

Figures 7a to 7e show a helmet 100 according to the present invention. Similarly to FIGS. 6a to 6d, this helmet 100 comprises a first part 110, a second part 120, a third part 130 and a fourth part 140.

Each of these parts is secured to at least two other parts by means of attachment zones as described above.

It will be noted that the fourth part 140 of this helmet 100 is advantageously shaped by the mold 600 illustrated in FIG. 1.

Advantageously, the rigidity of the helmet according to the present invention is essentially, if not entirely, or due to at least 80%, preferably at least 90% and even more preferably at least 95% to the frame of the helmet formed of the first part and the second part, and preferably the fourth part and advantageously the fourth part.

Advantageously, the puncture resistance of the helmet according to the present invention is essentially, if not entirely, or due to at least 80%, preferably at least 90% and even more preferably at least 95% due to the framework. of the helmet formed by the first part and the second part, and preferably by the fourth part and advantageously by the fourth part.

Thus, the other elements of the helmet such as comfort elements or aesthetic or sealing elements do not significantly contribute to the rigidity or the resistance of the helmet to puncture.

The present invention thus allows the use of material with mechanical properties allowing a reduction in the weight of a helmet while retaining an impact resistance equivalent to helmets of the same impact resistance category, but for which the weight is greater.

The present invention thus relates to a method of manufacturing a helmet from the manufacture of a plurality of parts of said helmet. These parts are then joined to each other to form the helmet.

This puzzle approach makes it possible to shape the parts into molds from layers of layers.

The invention is not limited to the embodiments described, but extends to any embodiment falling within the scope of the claims.

REFERENCES

100. Helmet

110. First part of the helmet

111. Thickness of the first part of the helmet

120. Second part of the helmet

121. Thickness of the second part of the helmet

130. Third part of the helmet

140. Fourth part of the helmet

150. First contact interface

151. First connection surface of the first contact interface

151a. Average thickness of the first part at the level of the first contact interface

151 b. First tilt angle

152. Second connection surface of the first contact interface

152a. Average thickness of the second part at the level of the first contact interface

152b. Second tilt angle

153. Thickness of the first contact interface

154. Lateral extension of the projection of the first contact interface between the first connection surface and the second connection surface.

160. Second contact interface

161. First connection surface for the second contact interface

162. Second connection surface of the second contact interface

170. Third contact interface

171. First connection surface for the third contact interface

172. Second connection surface of the third contact interface

180. Fourth contact interface

181. First connection surface for the fourth contact interface

182. Second connection surface of the fourth contact interface

200. Stacking layers

210. First layer

220. Second layer

221. Thickness of the second layer

230. Third layer

231. Third additional layer

240. Fourth layer

250. Fifth layer

251. Thickness of the fifth layer

260. Sixth layer

261. Additional sixth layer

300. Mold of the first part of the helmet

310. First part of the mold

311. First molding surface

320. Second part of the mold

321. Second molding surface

330. Beveled surface

331. First bevelled surface

332. Second beveled surface

400. Mold of the second part of the helmet

410. First part of the mold

411. First molding surface

420. Second part of the mold

421. Second molding surface

430. Beveled surface

431. First bevelled surface

432. Second bevelled surface

500. Pressure applied

510. First press

520. Second press

530. Third press

540. Fourth press

600. Mold of the fourth part

5 610. First part of the mold 611. First molding surface 620. Second part of the mold 621. Second molding surface 630. Beveled surface 10 631. First bevelled surface 632. Second bevelled surface

Claims (22)

1. Helmet (100) comprising at least a first part (110, 120, 130, 140) and a second part (110, 120, 130, 140) characterized in that each of the first (110, 120, 130, 140) and second (110, 120, 130, 140) parts includes: • An internal layer (210, 240) having an internal face intended to be turned opposite the head of a user; • An outer layer (230, 231, 260, 261) having an outer face opposite the inner face, intended to be turned towards the outside of the helmet; • A spacer layer (220, 250) having a honeycomb structure and being disposed between the inner layer (210, 240) and the outer layer (230, 231,260, 261); • At least one bevelled edge (151, 152, 161, 162, 171, 172, 181, 182) being defined by at least part of the internal face or the external face; • The first part (110, 120, 130, 140) and the second part (110, 120, 130, 140) being configured to be integral with one another by fixing the beveled edge (151, 152, 161, 162, 171, 172, 181, 182) of the first part (110, 120, 130, 140) with the bevelled edge (151, 152, 161, 162, 171, 172, 181, 182) of the second part 110, 120, 130, 140) so as to define a first contact interface (150, 160, 170, 180) between the first part (110, 120, 130, 140) and the second part (110, 120, 130, 140) . 2. Helmet (100) according to the preceding claim wherein the beveled edge (151, 152, 161, 162, 171, 172, 181, 182) of the first part (110, 120, 130, 140) is glued to the edge beveled (151, 152, 161, 162, 171, 172, 181, 182) of the second part (110, 120, 130, 140). 3. Helmet (100) according to any one of the preceding claims, in which each beveled edge (151, 152, 161, 162, 171, 172, 181, 182) extends from the external face towards, and preferably up to, to, the internal face or from the internal face towards, and preferably up to, the external face. 4. Helmet (100) according to the preceding claim wherein the beveled edge (151, 152, 161, 162, 171, 172, 181, 182) forms an acute angle and an obtuse angle with the inner and outer faces, the angle acute being between 15 ° and 85 °, preferably between 30 ° and 60 °, and advantageously equal to 45 °. 5. A helmet (100) according to any one of the preceding claims in which the first and second parts (110, 120, 130, 140) have homogeneous thicknesses outside the first contact interface. 6. Helmet (100) according to any one of the preceding claims wherein the beveled edge (151, 152, 161, 162, 171, 172, 181, 182) of the first part and the beveled edge (151, 152, 161 , 162, 171, 172, 181, 182) of the second part cooperate so as to define, when the first part (110, 120, 130, 140) and the second part (110, 120, 130, 140) are joined, a surface continuity without a protruding part between the first part (110, 120, 130, 140) and the second part (110, 120, 130, 140). 7. Helmet (100) according to any one of the preceding claims, in which the projection (154), in a plane tangent to the surface of the first part (110, 120, 130, 140) or of the second part (110, 120, 130, 140), of the first contact interface (150, 160, 170, 180) is not zero and preferably this projection (154) is between 0.5 and 1.5 times a thickness of the first part (111) or of the second part (121), this thickness being measured less than two centimeters from said first contact interface (150, 160, 170, 180) and in a direction tangent to the surface of the first contact interface (150, 160 , 170, 180). 8. Helmet (100) according to any one of the preceding claims in which the ratio between the thickness (111) of the first part (110, 120, 130, 140) outside the first contact interface (150, 160 , 170, 180) and the thickness (151a) of the first part (110) at the level of the first contact interface (150, 160, 170, 180) is greater than 1, preferably greater than 1.5 and advantageously greater than or equal to 2, the thicknesses being measured according to the normal to the tangent at the point of measurement of the internal face or of the external face of the first part (110, 120, 130, 140), and in which the ratio between the thickness (121) of the second part (110, 120, 130, 140) outside the first contact interface (150, 160, 170, 180) and the thickness (152a) of the second part (110, 120, 130, 140) at the level of the first contact interface (150, 160, 170, 180) is greater than 1, preferably greater than 1.5 and advantageously greater than or equal to 2, the thicknesses being measured according to the normal to the tangent at the measurement point of the internal face or the external face of the second part (110, 120, 130, 140). 9. Helmet (100) according to any one of the preceding claims, in which the sum of the thickness (151a) of the first part (110, 120, 130, 140) at the level of the first contact interface (150, 160 , 170, 180) and the thickness (152a) of the second part (110, 120, 130, 140) at the level of the first contact interface (150, 160, 170, 180) is equal to the thickness ( 111, 121) of the first part (110, 120, 130, 140) outside the first contact interface (150, 160, 170, 180) and of the second part (110, 120, 130, 140) outside of the first contact interface (150, 160, 170, 180), the thicknesses being measured according to the normal to the tangent at the measurement point of the internal face. 10. Helmet (100) according to any one of the preceding claims, in which the thickness (221) of the spacer layer (220, 250) is greater than the thickness of the internal layer (210, 240) and that of the external layer (230, 231, 260, 261), the thicknesses being measured according to the normal to the tangents at the measurement point of the internal face and of the external face respectively. 11. Helmet (100) according to any one of the preceding claims, in which the spacer layer (220, 250) comprises at least one material having a honeycomb structure selected from at least: Aluminum, plastic, thermoplastic, any type of foam or any type of foam material. 12. Helmet (100) according to any one of the preceding claims in which the internal layer (210, 240) comprises at least one material taken from at least: carbon fibers, glass fibers, synthetic fibers, vegetable fibers, or any type of fibers, and in which the outer layer (230, 231, 260, 261) comprises at least one material chosen from at least: carbon fibers, glass fibers, synthetic fibers, vegetable fibers, or any type of fiber. 13. A helmet (100) according to any one of the preceding claims comprising at least: A left sagittal part (110) intended to cover at least partially the left occipital part of the skull of a user, a right sagittal part (120) intended to cover at least partially the right occipital part of the skull of the user, • a top part (140) intended to cover at least a part of the top of the user's skull, • and in which said first part (110, 120, 130, 140) and said second part (110, 120, 130, 140) are taken from: the left sagittal part (110), the right sagittal part (120) and the summit part (140). 14. Helmet (100) according to the preceding claim wherein the left sagittal part (110), the right sagittal part (120) and the summit part (140) form two by two said first part (110, 120, 130, 140) and said second part (110, 120, 130, 140), so that: • the left sagittal part (110) and the right sagittal part (120) together define said first contact interface (150, 160, 170, 180), and • the left sagittal part (110) and the summit part (140) define together said first contact interface (150, 160, 170, 180), and • the right sagittal part (120) and the summit part (140) together define said first contact interface (150, 160, 170, 180). 15. Helmet (100) according to any one of the two preceding claims in which: The left sagittal part (110) has a beveled edge (151, 152, 161, 162, 171, 172, 181, 182) attached to a beveled edge (151, 152, 161, 162, 171, 172, 181, 182) of the right sagittal part (120), and • the left sagittal part (110) has a beveled edge (151, 152, 161, 162, 171, 172, 181, 182) attached to a beveled edge (151, 152, 161, 162, 171, 172, 181, 182) of the summit part (140), and • the right sagittal part (120) has a beveled edge (151, 152, 161, 162, 171, 172, 181, 182) fixed to a beveled edge (151, 152, 161, 162, 171, 172, 181, 182) of the top part (140). 16. Helmet (100) according to any one of the three preceding claims comprising at least one framework intended to cover at least part of the skull of a user, the framework being formed only by the left sagittal part (110), the right sagittal part (120), the top part (140) and possibly by a chin strap (130). 17. Helmet (100) according to any one of the preceding claims comprising at least: A left sagittal part (110) intended to cover at least partially the left occipital part of the skull of a user, a right sagittal part (120) intended to cover at least partially the right occipital part of the skull of the user, • a chin strap (130), • and wherein said first part (110, 120, 130, 140) and said second part (110, 120, 130, 140) are taken from: the left sagittal part (110), the part right sagittal (120) and chin rest (130). 18. Method for manufacturing at least part (110, 120, 130, 140) of a helmet (100) according to any one of the preceding claims comprising at least the following, preferably successive, steps: • Arrangement of a primary layer taken from the internal layer (210, 240) and the external layer (230, 231, 260, 261), in a first part (310) of a first mold (300) comprising at least one beveled surface (331) configured to define at least said beveled edge (151, 152, 161, 162, 171, 172, 181, 182) of said portion (110, 120, 130, 140); • Arrangement of the spacer layer (220, 250) above the primary layer, preferably in contact at least in part with the primary layer; • Arrangement of a second part (320) of the first mold (300) above the spacer layer (220, 250), preferably in contact at least in part with the spacer layer (220, 250), the second part (320) of the first mold (300) having a shape that is at least partly complementary to the first part (310) of the first mold (300); • Application of a first pressure (510) on the first (310) and / or the second (320) part of the first mold (300) so as to join, and preferably to conform, the primary layer and the layer of spacing (220, 250); • Removal of the second part (320) from the first mold (300); • Layout of a secondary layer, the secondary layer being the other among the inner layer (210, 240) and the outer layer (230, 231, 260, 261) above the spacer layer (220, 250 ), preferably at least partly in contact with the spacer layer (220, 250); • Arrangement of the second part (320) of the first mold (300) above the secondary layer, preferably in contact at least in part with the secondary layer; • Application of a second pressure (520) on the first (310) and / or the second (320) part of the first mold (300) so as to secure, and preferably to conform, the spacer layer (220, 250) and the secondary layer, and so as to form in part at least the beveled edge (151, 152, 161, 162, 171, 172, 181, 182) of said part; • Removal of the second part (320) from the first mold (300). 19. Method according to the preceding claim wherein the primary layer is the inner layer (210, 240) and the secondary layer is the outer layer (230, 231,260, 261). 20. A method according to any one of the two preceding claims comprising, before the step of placing the secondary layer on top of the spacer layer (220, 250), a step of placing a resin on a part. at least the spacer layer (220, 250). 21. Method according to any one of the three preceding claims, comprising a step of heating the primary layer and / or the spacer layer (220, 250) to a first temperature when the second part (320) of the mold (300 ) is arranged above the spacer layer (220, 250), and comprising a step of heating to a second temperature the spacer layer (220, 250) and / or the secondary layer (230, 231 , 260, 261) when the second part (320) of the mold (300) is arranged above the secondary layer. 22. A method of manufacturing at least one helmet (100) according to any one of claims 1 to 17 from at least a first part (110, 120, 130, 140) of the helmet (100) obtained according to method according to any one of claims 18 to 21 and at least a second part (110, 120, 130, 140) of the helmet (100) obtained according to the method according to any one of claims 18 to 21, said method manufacturing comprising at least the following successive steps: • Arrangement of at least one first adhesive element on at least part of the bevelled edge (151, 152, 161, 162, 171, 172, 181, 182) of the first part (110, 120, 130, 140) and / or on at least part of the bevelled edge (151, 152, 161, 162, 171, 172, 181, 182) of the second part (110, 120, 130, 140); • Fixing of the first part (110, 120, 130, 140) with the second part (110, 120, 130, 140) by applying at least one part of the beveled edge (151, 152, 161, 162, 171, 172, 181, 182) of the first part (110, 120, 130, 140) on the beveled edge (151, 152, 161, 162, 171, 172, 181, 182) of the second part (110, 120, 130 , 140).