Helmet

Abstract

A helmet designed for high-altitude work and mountaineering, comprising a crown (2) and a deflector (6). The crown (2) is provided with a crown surface which delimits a number of first through holes (4) separated by first studs (5) and defines a first ventilation area. The deflector (6) is attached to the crown (2) and arranged between the crown (2) and a space designed to receive the user's head. The deflector (6) faces the first ventilation area in a first direction perpendicular to the median sagittal plane of the user of the helmet. The deflector (6) defines a surface which extends mainly in a direction connecting the apex of the crown and the bottom end of the crown (2). The surface of the deflector (6) moves away from the surface of the crown (2) in the first direction directed towards the median sagittal plane (4b).

Description

Technical Field

[0001] This invention relates to a helmet. Background Technology

[0002] In the field of rope work, rope workers are equipped with a wide range of safety gear, including helmets. Helmets are designed to be fixed to the head and must protect the user from different types of impacts. To withstand increasingly severe impacts without increasing the weight of the helmet, improvements have been made to the shape, material, and method of securing the crown to the user's head.

[0003] In addition to these issues, there are also requirements regarding the control of the temperature inside the helmet, especially when the external temperature is high and / or when strenuous exercise is required.

[0004] To improve thermal comfort, helmets may have one or more vents leading to the user's head to create airflow. This airflow clears the space between the head and the crown or foam liner, thereby reducing the temperature inside the helmet.

[0005] For obvious safety reasons, it is not possible to manufacture holes in a large portion of the crown while maintaining reasonable size and weight. As a result, holes are usually found on the right and left sides of the crown.

[0006] Regardless of its position on the crown, a through-hole through the thickness of the crown is equivalent to the existence of a channel directly toward the user's head. It is evident that under certain conditions, particularly during tree pruning, when relative movement occurs between the branch and the crown, the branch or other slender object can pass through the channel and strike the user's head, for example, when the branch moves in a substantially horizontal direction toward the interior of the volume defined by the crown.

[0007] To avoid this problem, some trimmed helmets do not have through-holes, thus preventing airflow from forming in the upper part of the helmet's interior space. An alternative is to manufacture holes with a small cross-section. Due to the small cross-section, airflow is very limited, meaning a large number of holes are required. However, the formation of a large number of holes naturally leads to compromised mechanical properties, necessitating further modifications to the crown.

[0008] We found it difficult to manufacture a helmet for mountaineering or high-altitude work that could both create significant airflow at the top of the crown and provide a high level of protection.

[0009] We found ventilation issues also exist in other helmet categories, particularly ski helmets with rigid crowns containing foam liners. The crown defines ventilation openings, and the foam liner further defines staggered openings, and / or a mesh is fitted between the crown and the foam liner. It should be noted that ventilation issues vary depending on skier speed, activity temperature, and impact type, requiring additional trade-offs in the configuration and location of the openings, ultimately resulting in the openings primarily being located at the top of the helmet. Furthermore, this construction is unattractive for helmets used in mountaineering or high-altitude work, as it means that to meet different regulatory requirements, especially in resisting penetrating impacts from objects falling onto the top of the helmet, the helmet must be heavier and larger. Summary of the Invention

[0010] One object of the present invention is to provide a helmet that allows for a better balance between protection and ventilation inside the crown without compromising other parameters of the helmet.

[0011] This problem can be solved with a helmet designed for working at heights and mountaineering, which includes:

[0012] - A crown having a peak and a base, the base having a crown wall defining a plurality of first through holes separated by a first stud to form a first ventilation area, the crown extending in the height direction between the base and the peak;

[0013] - A hat, which defines the space that accommodates the user's head.

[0014] The helmet is notable for including a steering mechanism attached to the crown and positioned between the crown and a space defined by the helmet and designed to accommodate the user's head, to turn an object entering through a first through-hole.

[0015] The steering mechanism has a steering wall facing the first ventilation area in a first direction perpendicular to the height direction, and the steering wall extends to the top in a direction toward the peak.

[0016] The inner wall of the crown and the deflector form a conduit, the conduit opening in the direction toward the peak of the crown and widening in the same direction; and

[0017] The top is located between the inner wall of the cap and the crown, such that any imaginary line tangent to the top and passing through the first through-hole passes through the crown but not through the space defined by the cap that accommodates the user's head.

[0018] In a preferred embodiment, the steering mechanism defines a plurality of second through holes spaced apart by second studs to form a second ventilation area. The area of ​​the second through holes is smaller than the area of ​​the first through holes facing the second through holes in a first direction.

[0019] Preferably, each first through hole faces at least two second through holes in a first direction.

[0020] In an advantageous manner, the steering gear is installed so that it can be removed from the crown.

[0021] Preferably, the baffle is installed to be movable relative to the first ventilation area between a closed position and an open position, wherein in the closed position the first through hole is blocked by the baffle, and in the open position the baffle is not facing the first through hole in the first direction.

[0022] According to one embodiment, the steering mechanism is mounted to be movable relative to the crown between a protected position and another position, in which the baffle is mounted to be securely fastened to the steering mechanism. The protected position is the position of the steering wall opposite the first ventilation area in the first direction. The other position corresponds to the closed position of the baffle. Attached Figure Description

[0023] Other advantages and features will become more apparent from the following description of specific embodiments and implementations of the invention, given for non-limiting purposes only and illustrated in the accompanying drawings, wherein:

[0024] - Figure 1 A perspective view of a helmet with a steering mechanism is schematically shown, the steering mechanism being in a protected position and defining a second through-hole;

[0025] - Figure 2 A schematic side view of a helmet equipped with a steering mechanism is shown, the steering mechanism being in a protected position and defining a second through-hole;

[0026] - Figure 3 A schematic perspective view of the interior of a helmet equipped with a steering mechanism is shown, with the steering mechanism in a protected position and defining a second through-hole.

[0027] - Figure 4 A schematic perspective view of the interior of a helmet equipped with a steering mechanism is shown, with the steering mechanism in the closed position and defining a second through-hole;

[0028] - Figure 5 A perspective view of the crown of a helmet with a steering mechanism is schematically shown, the steering mechanism being in the closed position and extending through a baffle that closes the first through-hole;

[0029] - Figure 6A schematic side view of the crown of a helmet equipped with a steering mechanism is shown, with the steering mechanism in the closed position and extending through a baffle that closes the first through-hole.

[0030] - Figure 7 A perspective view schematically shown is a cross-section along the midsagittal plane of the helmet crown, which is provided with two attachment devices designed to pass through the crown to form a fixed bracket for a steering gear.

[0031] - Figure 8 A perspective view schematically shown is a cross-section along the midsagittal plane of the crown, which is provided with two fixed supports, during the installation of the steering gear;

[0032] - Figure 9 A schematic side view of a cross-section along the midsagittal plane of a coronal portion provided with two fixed supports is shown, wherein the steering device is attached to the coronal portion;

[0033] - Figure 10 Schematic illustration along Figure 9 The enlarged view shows details of the steering gear and baffle fixed to the fixed bracket on the cut plane AA, and shows the view of the airflow entering and passing through the crown with the steering gear in the protected position;

[0034] - Figure 11 Schematic illustration along Figure 9 An enlarged view showing details of the steering gear and baffle fixed to the fixed bracket on the cutting plane AA, with the steering gear in the closed position;

[0035] - Figure 12 A schematic view of a steering gear that defines a second through-hole and forms a baffle is shown;

[0036] - Figure 13 A schematic view of a steering gear without a second through-hole forming a baffle is shown.

[0037] - Figure 14 A schematic view of the cap being installed in the crown is shown. Detailed Implementation

[0038] Figures 1 to 11 This describes a protective helmet 1 equipped with a crown 2 and a cap 3. The cap 3 is designed to receive the user's head. The cap 3 allows the user's head to be positioned at a certain distance from the crown 2. The cap 3 is preferably fixed to the crown 2. The cap 3 can be in the form of a set of linear elements, such as webbing, as is known in the art, to define an empty space conducive to airflow.

[0039] The crown 2 is made of a material that cannot be folded into itself. The crown 2 may preferably be made of a plastic material, such as polycarbonate or injection-molded ABS or polystyrene or foamed polypropylene, or any other plastic material, particularly injection-molded plastic, thermoformed plastic or foam plastic.

[0040] The crown 2 has a peak 2a and a base 2b. The crown wall extends from the base 2b to the peak 2a in the height direction ZZ, which substantially corresponds to the longitudinal direction of the user wearing the helmet.

[0041] The base 2b may define a support plane corresponding to a horizontal plane tangent to the lowest point of the crown 2 when the user wears the helmet 1. Preferably, the support plane is defined by at least three points of the base 2b pressing against the plane when the helmet 1 is placed on the support. Figure 2 The supporting plane AA is shown.

[0042] Crown 2 defines a crown surface, which represents the surface of the central surface of the crown in the thickness direction. This crown surface is an approximately hemispherical curved surface.

[0043] To remove some of the heat emitted by the user's head, the crown 2 has a crown wall defining a plurality of first through holes 4. The first through holes 4 are preferably a right first hole and a left first hole, i.e., first holes arranged in the right and left portions relative to the median sagittal plane of the user wearing the helmet 1. It is also advantageous that the right and left first through holes are arranged symmetrically relative to the median sagittal plane. A front first hole and / or a rear first hole may also be provided as an alternative or supplement to the right and left first holes.

[0044] like Figure 1 , Figure 2 , Figure 3 and Figure 4 as well as Figures 7 to 10 As shown, the first through hole 4 extends through the thickness direction (i.e., in the direction connecting the inner surface of the crown 2 and the outer surface of the crown 2). The first through hole 4 also extends through the first direction parallel to the support plane AA.

[0045] The right first through-hole and the left first through-hole 4 are designed to enhance the airflow between the crown 2 and the user's head, at least in the top portion of the crown 2. The first through-hole 4 can be of any shape. The shape of the first through-hole 4 can vary among multiple first through-holes 4.

[0046] The first through holes 4 are separated from each other by the first studs 5. The first through holes 4 define a first region. It has been observed that in order to have an airflow that ensures effective heat dissipation, the first through holes 4 must be large. The first through holes 4 have a large cross-section without compromising the mechanical properties of the crown 2 in resisting impact.

[0047] To facilitate effective airflow, each of the first through holes 4 has a first area that is as large as possible, for example, greater than 1 cm². 2 Preferably, it is greater than 2 cm 2 More preferably greater than 5 cm 2 And even more preferably, larger than 8 cm 2 or 10 cm 2 .

[0048] However, the larger the value of the first area, the easier it is for the cross-section of a foreign object (such as a twig or branch) to enter the interior of the crown 2. Furthermore, the risk of injury increases with the cross-section of the foreign object.

[0049] To maintain a large airflow while reducing the probability of the head coming into contact with foreign objects entering from the outside of the crown 2, the helmet 1 is provided with a deflector 6. The deflector 6 includes a deflector wall 6' arranged within the volume defined by the crown 2 and the volume designed to receive the head and represented by the cap 3. The deflector 6 is located facing the first through-hole 4 in a first direction. The deflector 6 is located between the crown 2 and the cap 3, that is, between the crown 2 and the volume representing the user's head.

[0050] Preferably, the steering mechanism 6 is fixed to the crown 2. The steering mechanism 6 has a steering wall 6' that is different from the crown wall. The steering wall 6' is rigid or substantially rigid. The steering wall 6' is made of, for example, plastic, metal, or wood. The steering wall 6' is not a mesh attached to the crown 2.

[0051] In a particular embodiment, the steering wall 6' can resist a thrust of 1 kN in the direction of the cap 3. This prevents foreign objects from reaching the user's head.

[0052] The steering wall 6' extends from the region facing the first through hole 4 in the direction toward the peak 2a of the crown 2. The steering wall 6' is located at one end near the peak 2a, that is, opposite the bottom end near the base 2b. Such resistance is not possible for the cap 3, which must be flexible to provide the expected comfort.

[0053] The turning wall 6' defines at least one portion having an inclined surface that is generally directed toward the peak 2a of the crown 2. The inclination of the turning wall 6' allows a foreign object entering from the outside through the first through hole 4 to slide against the turning wall 6' and be guided toward the peak 2a of the crown 2. More specifically, the turning wall 6' is inclined in the direction of the space between the peak of the cap 3 and the peak 2a of the crown 2, without passing through the surface defined by the cap 3.

[0054] The tip of the steering wall 6' is located between the crown 2 and the cap 3, such that any imaginary line tangent to the tip and passing through the first through-hole 4 passes through the crown 2 without passing through the space defined by the cap 3 for receiving the user's head. Foreign objects can enter the crown through the first through-hole 4. The foreign object contacts the steering wall 6' and slides along it until it leaves the steering mechanism 6. At this point, the foreign object is tangent to the tip. The alignment between the tip and the first through-hole prevents straight foreign objects from penetrating into the volume designed to receive the user's head.

[0055] The steering wall 6' prevents foreign objects from moving in the first direction toward the cap 3 to prevent contact with the user's head, and / or tilts the object to guide it into the space between the peak of the cap 3 and the peak 2a of the crown 2 without penetrating the cap 3, allowing the object to move in an area with very little or even zero risk of contact with the head. This avoids the need to form a more robust and therefore larger and heavier steering mechanism 6. This deviation may cause the object to wed into the first stud 5, thus also reducing the risk of injury. If the object enters the helmet 1 via a downward path, the steering mechanism 6 moves toward the crown 2 and forms a blocking portion. The steering wall 6' prevents external elements from penetrating into the crown 2 until the external element reaches the space designed to receive the user's head or press against the cap 3.

[0056] For example, the steering mechanism 6 defines an inclined surface that extends primarily in the direction connecting the peak 2a of the crown 2 and the lower right or lower left end of the crown 2, depending on whether the steering mechanism 6 is fixed to the right or left side of the crown 2. The inclination angle of the steering wall 6', particularly the position of its tip, can be adjusted according to the position of the first through hole 4, the curvature of the crown 2, and the available space between the cap 3 and the crown 2. The same applies when it is mounted on the rear or front of the crown 2.

[0057] The steering device 6 has an inclination similar to that of the crown 2 in the area facing the first ventilation zone, but the two are different so as not to reduce the volume accessible to the user's head without reducing the ability to receive airflow.

[0058] When viewed along a cutting plane perpendicular to the support plane AA, the walls of the crown 2 and the deflector 6 are far apart from each other, and further apart as they move away from the support plane AA toward the peak 2a in the height direction ZZ perpendicular to the support plane. In other words, the structure, whose profile is defined by the wall of the crown 2 on one hand and by the wall of the deflector 6 on the other, flares outward in the direction toward the peak 2a. The deflector wall 6' and the inner wall of the crown define a duct that opens to allow airflow to pass through the top of the helmet 1. The duct flares outward in the direction toward the peak 2a to facilitate the formation of a larger airflow.

[0059] Particularly advantageous is that the deflector 6 does not define a surface parallel to the surface of the crown 2, and the deflector 6 gradually moves away from the crown 2 as it moves away from the support plane AA. The separation distance between the crown 2 and the deflector 6 can be observed in a section perpendicular to the support plane AA. This separation enhances the formation of airflow in the inner top portion of the crown 2, thereby eliminating obstruction above the area receiving the user's head. The formation of the edge is also advantageous to ensure a minimum separation distance between the crown wall defining the first through-hole 4 and the wall of the deflector 6. This minimum space ensures minimal airflow is captured for proper ventilation of the helmet 1.

[0060] like Figure 3 , Figure 4 , Figure 9 and Figure 10 As shown, it is particularly advantageous that the steering device 6 extends toward the first through hole 4 on its entire facing surface, at least between the first through hole 4 and the head-accessible space defined by the cap 3 in the first direction.

[0061] In a preferred embodiment, the steering mechanism 6 extends below the first through-hole 4. More preferably, the steering mechanism 6 contacts or separates from the crown 2 by a distance less than a threshold, such as less than 6 mm, less than 4 mm, or less than 2 mm, to prevent foreign objects with a diameter larger than the threshold from passing through it. Figure 3 , Figure 9 and Figure 10 The first direction, parallel to the midsagittal plane and representing the vertical direction, passes between the crown 2 and the steering mechanism 6. The contact between the crown 2 and the steering mechanism 6 improves mechanical performance.

[0062] As Figures 1 to 4 In the exemplary embodiment shown, the crown 2 defines an edge defining the first through hole 4. The attachment between the steering gear 6 and the crown 2 is located on one side of the edge, while the first through hole 4 is located on the other side of the edge.

[0063] To enhance air intake, it is advantageous that the wall of the deflector 6 is offset from the wall of the crown 2 by a few millimeters. Particularly advantageous is that the deflector 6 does not contact the crown 2, and the wall of the deflector 6 extends toward the top portion of the crown 2 to form an opening that enhances the airflow out of the top portion of the crown 2. Air passing through the crown 2 comes into contact with the deflector 6, which does not define a closed volume. As the deflector 6 gradually moves away from the crown 2 as it approaches the peak 2a, the incoming air easily flows toward the peak 2a of the crown 2, thereby achieving an airflow capable of removing heat.

[0064] like Figures 1 to 4 As shown, in order to promote airflow as close as possible to the top of the user's head, it is advantageous that the deflector 6 defines a plurality of second through holes 7 arranged facing the first ventilation area. The facing direction is the first direction.

[0065] The second through hole 7 is separated from each other by the second stud 8.

[0066] Advantageously, the second through hole 7 faces the first through hole 4, and more preferably, the second through hole 7 has a smaller cross-section than the first through hole 4. A large amount of air enters through the first through hole 4, and a portion of the air passes through the second through hole 7, while the remaining air passes along the second stud 8 in the direction toward the peak 2a of the crown 2.

[0067] Since the steering mechanism 6 is located inside the crown 2, it is not designed to withstand the same impacts as the crown 2. Advantageously, the steering mechanism 6 is formed to be as well-ventilated as possible so as not to overly restrict the airflow entering through the first through-hole 4.

[0068] In order to facilitate the presence of airflow without compromising protective performance, it is advantageous for the second through-hole 7 to have a size smaller than a threshold. It is also advantageous that one or more second through-holes 7 directly face the first through-hole 4, and even more advantageous that each first through-hole 4 directly faces multiple second through-holes 7.

[0069] Preferably, when the steering gear 6 is provided with a second through hole 7, it is advantageous that the steering gear 6 is provided with a flange 6a, which is mounted below the second through hole 7 and extends in the height direction ZZ towards at least 50% of the overlapping area between the first through hole 4 and the second through hole 7, more preferably over at least 75% of the overlapping surface, and even more preferably over at least 100% of the overlapping surface. Such an embodiment in Figure 4 and Figure 5 As shown in the image.

[0070] Figure 12 An embodiment of a steering gear 6 defining a second through hole 7 is shown, and Figure 13 An embodiment of the steering gear 6 without the second through hole 7 is shown.

[0071] Of particular advantage is that the steering device 6 is fixed to the crown 2, and more preferably to the crown 2 by attachment points located between and / or below the first through holes 4, so as to provide a firm fixation that can withstand the mechanical stress of foreign objects without impairing airflow.

[0072] In a particular embodiment, the deflector 6 is mounted so that it can move relative to the crown 2 between a protected position and another position. In the protected position, the inclined wall of the deflector 6 is arranged to face the first through-hole 4. In the other position, the inclined wall does not face the first through-hole 4. The other position can be a fully closed position of the first through-hole 4 to prevent airflow from being supplied to the interior of the crown 2, or an integral operating position, i.e., a position that allows the exterior of the large-sized component crown 2 to pass through the first through-hole 4 to contact the cap 3.

[0073] Of particular advantage, the steering gear 6 is mounted so that it can translate or rotate relative to the crown 2 to define a first position and another position.

[0074] exist Figure 3 , Figure 4 , Figure 7 and Figure 9 In the illustrated embodiment, the crown 2 defines a plurality of tracks 9 extending primarily in the direction connecting the peak 2a of the crown 2 and the bottom end of the crown 2. A deflector 6 defines a recess 10 having a shape complementary to the shape of the tracks 9. This configuration with the recess 10 and tracks 9 can reduce or prevent movement of the deflector 6 relative to the crown 2 in a direction perpendicular to the extension direction of the tracks 9. When the deflector 6 is configured to be removable from the crown 2, this configuration allows the position of the deflector 6 relative to the crown 2 to be determined.

[0075] The track 9 and the groove define a slide between the crown 2 and the steering device 6, allowing the steering device 6 to translate relative to the crown 2. More generally, the crown 2 may form one or more grooves 10, and the steering device 6 may form one or more tracks 9. Advantageously, the steering device 6 is attached to the crown 2 by a plurality of retaining brackets 11, which may be in the form of clips. Preferably, the clips are configured to be removable from the crown 2, and the retaining brackets 11 are configured to cooperate with the steering device 6 to securely fasten the retaining brackets 11 and the steering device 6 to the crown 2.

[0076] Advantageously, the crown 2 defines a hole 12 for each retainer 11 to pass through, and for the retainer 11 to pass through the crown 2 and the steering device 6, so as to securely attach the steering device 6 to the crown 2. Without the steering device 6, the retainer 11 cannot be secured to the crown 2, which prevents the formation of protrusions inside the crown 2.

[0077] Apart from one or more second through holes 7, the deflector 6 does not form a closed volume with the crown 2 to avoid unduly and adversely affecting airflow. Advantageously, the deflector 6, together with the crown 2, outlines an opening that extends along the entire length of the first ventilation area (i.e., along the direction of all the first through holes 4 on the side connecting the crown 2).

[0078] Preferably, the second through hole 7 has a second area smaller than the first area defined by the first through hole 4 facing the latter in the first direction. The steering mechanism 6 defines a second stud 8, the length of which is less than the length of the first through hole 4 facing the first through hole 4 in the first direction.

[0079] Since the steering mechanism 6 is mounted at a distance from one or more first through holes, a baffle 13 can be installed. The baffle 13 is configured to adjust the effective cross-sectional area of ​​one or more first through holes 4 by partially or completely blocking them. The operation of the baffle 13 can be independent of the steering mechanism 6, or even independent of the presence or absence of the steering mechanism 6. The baffle 13 can be fixed to the crown 2 and configured to slide relative to the crown 2 to partially or completely block one or more first through holes 4, thereby reducing or increasing the effective area allowing airflow. Figure 1 and Figure 2 The baffle 13 is shown in the position where the maximum airflow is allowed. Figure 5 and Figure 6 A baffle 13 is shown in the closed position to block the air inlet.

[0080] In the illustrated embodiment, the baffle 13 is fixedly mounted relative to the steering mechanism 6, and the steering mechanism 6 is movably mounted relative to the crown 2. The steering mechanism 6 defines a protected position and a closed position. In the protected position, when the steering mechanism 6 is located between the first through hole 4 and the cap 3, air can flow in a first direction. In the closed position, the baffle 13 blocks the first through hole 4. Figure 10 The steering gear 6 is shown in the protected position, and Figure 11 Steering gear 6 is shown in the closed position.

[0081] The crown 2 includes a front portion located at the front (i.e., near the user's forehead) and a occipital portion located at the back. The front portion is separated from the occipital portion by two lateral portions, one on the right and one on the left. The protective helmet 1 is preferably provided with a headband having the front and rear portions. The rear portion may be a neck strap. The headband is secured to the crown 2 to form a loop designed to pass around the user's head.

[0082] Figure 10 Two airflows are shown entering the volume defined by the crown 2 through the first through-hole 4. A portion of the airflow passes through the second through-hole 7 to reach the user's head. The other portion of the airflow slides along the deflector 6 and is directed toward the top portion of the crown 2.

[0083] Figure 3 and Figure 4 An adjustment device configured to adjust the circumference of the headband is partially shown, preferably having an adjustment knob for the headband 16a and a movable element 16b capable of limiting the circumference of the headband.

[0084] exist Figure 3 and Figure 4 In the illustrated embodiment, the crown 2 defines a cavity 14, which receives a clip 15 fixed to the end of the cap 3. Figure 14The diagram shows a pattern of attaching the cap 3 to the crown 2 using clip 15 and cavity 14.

Claims

1. A helmet, comprising: - Crown (2), the crown (2) having a peak (2a) and a base (2b), the base (2b) being provided with a crown wall, the crown wall defining a plurality of first through holes (4) separated by a first stud (5) to form a first ventilation area, the crown (2) extending in the height direction (ZZ) between the base (2b) and the peak (2a); - Cap (3), the cap (3) defines a space for accommodating the user's head; The helmet (1) is characterized in that it includes a steering mechanism (6) attached to the crown (2) and disposed between the crown (2) and a space defined by the cap (3) and designed to accommodate the user's head, so as to turn an object entering through one of the first through holes (4), the steering mechanism (6) being detached from the cap (3); The steering device (6) has a steering wall (6') facing the first ventilation area in a first direction perpendicular to the height direction (ZZ), and the steering wall (6') extends toward the peak (2a) to the top. The inner wall of the crown (2) and the deflector (6) form a conduit that opens toward and flares toward the peak (2a) of the crown (2); and The top is positioned between the inner walls of the cap (3) and the crown (2) such that any imaginary line tangent to the top and passing through the first through hole (4) passes through the crown (2) without passing through the space defined by the cap (3) designed to receive the user's head, and the turning wall (6') prevents the object from pressing against the cap (3) or reaching the space.

2. The helmet according to claim 1, characterized in that, The steering mechanism (6) defines a plurality of second through holes (7) separated by a second stud (8) to form a second ventilation area; The second through hole (7) has a smaller area in the first direction than the area of ​​the first through hole (4) facing it.

3. The helmet according to claim 2, characterized in that, Each first through hole (4) faces at least two second through holes (7) in the first direction.

4. The helmet according to any one of claims 1 to 3, characterized in that, The steering gear (6) is installed so that it can be removed from the crown (2).

5. The helmet according to any one of claims 1 to 3, characterized in that, The helmet includes a baffle (13) that is mounted to be movable relative to the first ventilation area between a closed position and an open position, wherein in the closed position the first through hole (4) is closed by the baffle (13) and in the open position the baffle (13) is not facing the first through hole (4) in the first direction.

6. The helmet according to claim 5, characterized in that, The steering mechanism (6) is mounted to be movable relative to the crown (2) between a protected position and another position, wherein the baffle (13) is fixedly mounted on the steering mechanism (6), wherein the protected position is the position of the steering wall (6') facing the first ventilation area in the first direction, and wherein the other position corresponds to the closed position of the baffle (13).

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