JP5180073B2 - Protective helmet - Google Patents

Abstract

The helmet includes a helmet shell (3) that surrounds the user's head except the face area of the user, a chin guard that surrounds lower parts of the user's face area, and a visor (4) pivotally positioned on helmet shell and on the chin guard to form an opening for the face between helmet shell and chin guard. The chin guard has two sections movably mounted on helmet shell. Each chin guard section is pivotally arranged on helmet shell. The pivotable arrangement of the chin guard sections takes place using flexible plate (2) which connects the helmet shell to corresponding chin guard sections.

Description

  The present invention is a protective helmet according to the preamble of claim 1, wherein the helmet shell at least partially surrounds the wearer's head excluding the face area when used, and a lower part of the face area of the wearer when used. And a visor arranged in a pivotable manner on the helmet shell to cover the visual field opening between the helmet shell and the chin guard, the chin guards relative to each other The present invention relates to a protective helmet having two movable parts.

  Such protective helmets reduce or prevent injury to the area of the helmet wearer's skull, especially in the event of a motorcycle accident. Several types can be distinguished.

For example, European Patent 0 433 182 describes a helmet having two jaw guard portions that are movable relative to each other and held in a manner that allows displacement to the helmet shell. In this helmet, when the chin guard is simply displaced in the direction toward the inside of the helmet, the opening of the helmet cannot be greatly expanded downward. Furthermore, it is not possible to realize a pre-bias in both the open position and the closed position of the chin guard. Furthermore, such a helmet is difficult to manufacture from a technical point of view and does not allow a joint between the two chin guards. As a result, it is impossible to synchronize the movement paths of the chin guard part with respect to the chin guard part.
A protective helmet with two chin guards movable relative to each other is also described in German Patent 41 33 223.

  Furthermore, there are also known helmets whose face areas are open (so-called “jet helmets”). Such helmets offer the advantage of fresh air, but are disadvantageous in rainy or cold weather. Also, in the event of an accident, the protection of the face and chin area is insufficient.

  Cross helmets are used in particular in the field of single-car sports and also have a relatively large visor opening to ensure an important air supply in the case of intense exercise. In contrast to jet helmets, these helmets have a stable chin guard to provide sufficient protection in the case of very frequent drops.

  So-called flip-up helmets or system helmets have an integral large chin guard, and in many cases a visor is also attached to the chin guard. The chin guard can be flipped upwards by a substantially horizontal pivot so that the helmet is easy to put on and take off. This type of helmet is mounted with the chin guard flipped upward, making it easy to mount the helmet, but the chin guard only pivots downward about the horizontal axis. As such, it does not provide an additional shape fit in the jaw region. In addition, this type of helmet cannot be removed while wearing glasses.

  According to a further embodiment, a helmet shell that substantially completely encloses the wearer's head excluding the face area when in use, a chin guard that completely encloses a lower portion of the wearer's face area when in use, and a helmet shell and a chin guard; A visor is provided, preferably arranged in a pivotable manner on the helmet shell, to cover the field opening between the two. Fixation to the wearer's head is caused by a chin strap that is pulled in the wearer's chin region after the helmet is worn. This type of helmet (so-called “integrated helmet”) is widely used but has the disadvantage that it is not practical to put on and take off. The difficulty of removing the helmet, especially in the event of an accident, can lead to a dangerous situation, especially in the case of a throat injury.

  Also, all types of helmets have the disadvantage that helmets of different sizes must be offered in order to select the product that best fits different head sizes. In practice, however, it has been found that in this manner the best possible fit for the helmet can only be obtained within a limited range. Thus, consumers often make a choice between a helmet that provides a good fit but is difficult to remove or that is easy to remove but difficult to fit. is there. Furthermore, the chin strap required to secure the helmet to the wearer's head in this type of helmet does not provide adequate retention, particularly in the jaw and neck areas, and its effect is difficult to fit. Even bigger in some helmets. This disadvantage is particularly noticeable at higher speeds where additional wind pressure can act and push up the helmet. Also, as a result of the lack of fit between the helmet and the front area, air flow can enter the helmet from below, causing unpleasant wind noise and cold, which can compromise ride comfort .

  Also, the chin strap has the disadvantage that it is difficult to handle, especially when wearing gloves. Also, it is difficult, if not impossible, to work with one hand. In addition, a number of fixation systems for chin straps are provided, but their operation is considered difficult when handling inexperienced systems for the first time. In fact, it is actually known that in an accident situation, it is often the case that an emergency medical practitioner takes time to open the chin strap fixation system and loses valuable time.

The goal of the present invention is therefore to realize a protective helmet that can be easily put on and taken off and provides better retention, especially in the jaw and neck regions. This helps to ensure that the helmet does not slip off the back of the head, especially in the course of accident situations. The term used in this field of the invention is referred to as “peeling behavior” and should be improved in the protective helmet according to the invention. Furthermore, the present invention must ensure that better aerodynamic and aeroacoustic properties and better protection against wind, dust and cold.
European Patent 0 433 182 German Patent No. 41 33 223

Summary of the Invention

  These objects are achieved by the features of claim 1 or 2. Claims 1 and 2 each comprise a helmet shell that at least partially surrounds the user's head except for the face area when in use, a chin guard that surrounds a lower part of the user's face area of the helmet when using the helmet, and a helmet shell And a visor preferably pivotally disposed on the helmet shell to form an opening for the face between the chin guard and the chin guard, the chin guard being movably attached to the helmet shell The present invention relates to a protective helmet having two parts. According to claim 1, each of the two chin guard portions is pivotably disposed on the helmet shell, and the pivotable arrangement of the chin guard portion on the helmet shell corresponds to the helmet shell in any case. This is done by a flexible plate member that connects to the chin guard. According to claim 2, it is provided that the two chin guards are connected to each other by their respective upper connecting joints. As a result, the two jaw guards always close synchronously even if the closing pressures applied by the hand to the two jaw guards are different. In particular, this measure makes it possible to close the chin guard with one hand.

  As a result of the pivotable configuration of the chin guard, the helmet opening can be widened first before the helmet is removed, making it easier to remove and install the helmet. Typically, both jaw guards move downwardly about their respective axes when opened so that both jaw guards move away from each other when opened. It is arranged so that it can pivot in a manner that it pivots outward. When closed, the chin guards move towards each other again to reduce the opening of the helmet.

  As a result of the measures according to the invention, a sufficiently large helmet opening for the removal of the helmet is ensured by the fact that the chin guard part can pivot, so that the chin guard part can be It can also be arranged in such a way that the opening of the helmet is made smaller after installation, in particular to significantly improve the retention in the jaw region. For example, according to the third aspect, the lower part of each of the two chin guard portions can be provided with a chin protecting surface protruding laterally in a direction toward the inside of the helmet. As described in more detail below, the helmet opening is further reduced upon closure of the chin guard, thus improving retention, as well as improving the aerodynamic and aeroacoustic properties of the helmet, as well as wind, dust, And improved protection against cold.

  A particularly advantageous embodiment for the chin guard is proposed in claim 4. According to claim 4, each of the chin guard portions includes a fixed region located at an end facing the helmet shell, and a closed region including a closing surface located at an end away from the helmet shell. The two closure surfaces are spaced apart from each other when the two chin guards are in the open position and abut each other in the closed position that can be reached by pivoting the two chin guards Yes.

  The feature of claim 5 is that a closure mechanism is arranged in the region of the closure surface, which spatially secures the two jaw guard parts in the closed position of the jaw guard part located against each other. Convenient in terms. The closure mechanism can be arranged in the vicinity of the surface directed downward in the region of the closure surface, for example configured as a clasp.

  According to claim 6, one of the closing surfaces is provided with a groove and the other closing surface is provided with a spring which is associated with the groove, the groove and the spring being engaged with each other in the closed position. As a result, in the case of an impact, the shear force of the two jaw guard portions can be absorbed better, and the load on the connection joint and the closing mechanism can be reduced. Therefore, it is possible to ensure that the closing mechanism functions properly in the event of an accident and when a load caused by the accident is applied to the chin guard.

When the two chin guards are biased to the open position according to claim 7, the two chin guards automatically pivot to the open position, for example after opening the closing mechanism. Where a flexible plate member is provided, the biasing is such that the plate member is free of tension when in the open position and tension is applied to the plate member as the closing movement proceeds. According to claim 8, according to claim 8, the fixing regions of the two chin guard parts each end on the side facing the helmet shell, which side faces the chin guard part in the closed position Sometimes it contacts one support surface of the helmet shell and separates from the support surface when the chin guard is in the open position. By supporting the chin guard part with the helmet shell in the closed position, better protection is ensured when a force acts on the chin guard part from below. In particular, when prepared according to claim 9, the side surface of the fixed region of the chin guard portion and the support surface of the helmet shell are each configured in a stepped manner, and these step portions are When the chin guard portions are in the closed position, they can engage with each other and better absorb the shear force between the chin guard portion and the helmet shell.

  According to the tenth aspect, the detachable pad having the surface facing the inside of the helmet is provided on the chin guard surface. This detachability ensures that pads with different thicknesses can be used so that the helmet can be better adjusted to different head sizes. Furthermore, the removable pad can be cleaned more easily.

  According to claim 11, the side surface of the fixed region is joined to the chin guard surface in an obtuse manner through the end surface along the longitudinal extension of the side surface, and the end surface is When the chin guard is in the closed position, it contacts the step for holding the helmet shell. Thereby, the force which acts on the chin guard part from the front is better absorbed by the helmet.

  If the visor further overlaps the two chin guards when the two chin guards are in the closed position according to claim 12, or if the two chin guards abut against the lower edge of the visor, It can be opened and closed independently of the visor.

  The present invention will now be described in more detail with reference to the accompanying drawings.

  Referring initially to FIG. 1, a perspective side view of one embodiment of a protective helmet according to the present invention comprising a helmet shell 3 and a chin guard portion 1a, 1b (in FIG. 1, only the chin guard portion 1a can be seen). The figure is shown with the chin guard portions 1a, 1b in the closed position. According to the illustrated embodiment, the chin guards 1 a, 1 b are each attached to the helmet shell 3 via the flexible plate member 2. The plate member 2 is made of a material that is permanently flexible and resists cracking and tearing, such as POM (polyoxymethylene / polyacetal) or PC, and is connected to the helmet shell 3 by an adhesive, rivet, or clasp. It is attached to the outer surface. FIG. 1 shows, by way of example, attachment with a rivet connection 5. Preferably, the plate member 2 may be submerged into the helmet shell 3 to provide a smooth surface for the benefit of improved aerodynamics. Furthermore, a visor 4 is preferably arranged on the helmet shell 3 in a pivotable manner. Usually, the pad 12 is provided on the inner surface of the helmet shell 3.

  When the plate member 2 pivots the chin guard portions 1a and 1b, the plate member 2 is attached to the helmet shell 3 and the chin guard portions 1a and 1b in such a manner that only a parallel pull line parallel to the pivot shaft is obtained. It is bent over. Therefore, in the plate member 2, the deformation | transformation which is not used for guidance of the chin guard parts 1a and 1b is prevented. As a result, the stress of the material of the plate member 2 is reduced.

  Further, the stress is also reduced in the fixing member 5 between the plate member 2, the helmet shell 3, and the chin guard portions 1a and 1b. Preferably, the two chin guard portions 1a, 1b are biased to the open position. Such a bias is achieved in such a way that the plate member 2 is free of tension when in the open position and is tensioned as the closing movement proceeds. can do. Regarding the configuration of the pivoting of the chin guard portions 1a and 1b on the helmet shell 3, the chin guard portions 1a and 1b are arranged so that the opening of the helmet increases as the transition from the closed position to the open position proceeds. This is possible as long as the pivoting ability of the chin guards 1a, 1b is firmly secured to the helmet shell 3.

  Both jaw guard parts 1a, 1b are usually different such that each of the two jaw guard parts 1a, 1b moves so that the center of gravity of the two jaw guard parts 1a, 1b moves away from each other when opened. It is arranged in a pivotable manner in such a way that it pivots downward and outward by means of a shaft. In closing, the chin guards 1a, 1b move towards each other, reducing the opening of the helmet. Therefore, the pivot shafts defined by the helmet shell 3, the chin guard portions 1a and 1b, and the plate member 2 are each directed in an oblique direction. With respect to FIG. 1, the pivot shaft extends generally from the lower left to the upper right.

  FIG. 2 shows a perspective side view of the embodiment of FIG. 1 with the chin guards 1a, 1b open. As already mentioned, as a result of the measures according to the invention, a sufficiently large opening for the removal of the helmet is ensured by the pivoting of the chin guard part, so that the opening of the helmet is further reduced after wearing. Thus, a configuration can be provided to the chin guard portions 1a, 1b which can greatly improve the setting of the helmet, especially in the chin region. FIG. 2 shows, by way of example, that each of the two chin guard portions 1a, 1b is provided with a chin guard surface 6 projecting laterally toward the inside of the helmet in these lower regions. Therefore, in this manner, when closing the chin guard portions 1a, 1b, the chin guard surfaces 6 move toward each other, and finally, when the chin guard portions 1a, 1b are in the closed position, they are coplanar with each other. Therefore, the opening of the helmet is further reduced. This not only improves helmet placement, but also provides better aerodynamic and aeroacoustic properties for the helmet and improves protection against wind, dust, and cold.

  In the following, the chin guard portions 1 a and 1 b can be divided into a fixed region 7 located at the end facing the helmet shell 3 and a closed region 13 located at the end away from the helmet shell 3. The closed regions 13 each have a closed surface 8, the two closed surfaces 8 being spaced apart from each other when the two jaw guard parts 1 a, 1 b are in the open position, and the two jaw guard parts 1 a, 1 b In the closed position, which can be achieved by pivoting, they lie against each other. In addition, the closure surface 8 can be provided with a rubber surface seal (not shown in FIGS. 1-9) for protection against wind and water ingress.

  The two chin guard portions 1a and 1b are connected to each other by a connecting joint in the upper part of the closed region 13 of the chin guard portions 1a and 1b. As a result, even if the closing pressure applied to the two chin guard portions 1a and 1b by the hand is different, the two chin guard portions 1a and 1b are always closed synchronously. As already mentioned, as a result of this measure, for example, the movement of the first chin guard part 1a is transmitted to the second chin guard part 1b by the connecting joint 10, so that the chin guard parts 1a, 1b are closed. It can also be done with one hand. It is also possible to dispose the closing mechanisms 11 and 14 in the region of the closing surface 8 to spatially fix the two jaw guard portions 1a and 1b in a closed position where they are in contact with each other. FIG. 2 shows a possible embodiment for such a closure mechanism 11, 14, which is possible with the aid of a lever 14 cooperating with the pin 11. Lifting the lever 14 releases the pin 11 and, as a result of the urging of the plate member 2, the two jaw guard portions 1a, 1b pivot to the open position. Such a lever 14 can also be operated with one hand, which is particularly advantageous, and should therefore be taken into account when selecting the closing mechanisms 11, 14.

  Accordingly, the connecting joint 10 preferably pivots downward and outward when the two jaw guard portions 1a, 1b are opened so that the two jaw guard portions 1a, 1b move away from each other when opened. Should be placed on top of each of the closed regions 13.

  Furthermore, FIG. 2 shows that one of the two closing surfaces 8 comprises a groove 9 and the other closing surface 8 comprises a spring 15 (see, for example, FIG. 4) combined with the groove 9, and in the closed position the groove 9 and It shows that the springs 15 are engaged with each other. As a result, in the case of an impact, the shearing force of the two jaw guard portions 1a and 1b can be absorbed better, and the load on the connection joint 10 and the closing mechanisms 11 and 14 can be reduced. Therefore, it is possible to ensure that the closing mechanisms 11 and 14 function properly in the event of an accident and when the stress generated thereby is applied to the chin guard portions 1a and 1b.

  FIG. 3 shows a perspective front view of the protective helmet of the embodiment of FIG. 1 according to the present invention with the chin guard portions 1a, 1b closed. An air slit 23 can be seen in front of the chin guard portions 1a, 1b to ensure sufficient ventilation inside the helmet and prevent fogging of the visor 4. FIG. 4 shows a perspective front view of the protective helmet of the embodiment of FIG. 1 according to the invention with the chin guard parts 1a, 1b open and a spring cooperating with the groove 9 (see FIG. 2). 15 is shown.

  FIGS. 5 and 6 each show a cross-sectional view of the explanatory view of FIG. 4. In FIG. 5, the chin guard portions 1 a and 1 b are located in the open position, and in FIG. . Furthermore, FIGS. 5 and 6 show the lining of the helmet shell 3. The helmet shell 3 itself presents the outermost protective shell and disperses the impact force. In the manufacture of the helmet shell 3, a thermoplastic material such as a duroplastic material, a glass fiber material (GRP) embedded in plastic, polycarbonate (PC), polyamide (PA), or acrylonitrile butadiene styrene (ABS) is used. Recommended to use. The pad 12 is made of polystyrene and is made of a foamed material, for example, a protective pad 12a that absorbs energy released upon impact inside the helmet, and the helmet is fixed and comfortable to the user's head in a comfortable manner. It can be comprised with the comfort pad 12b to fix. Further, the chin guard portions 1a and 1b and the chin guard surfaces 6 of the chin guard portions 1a and 1b can also be provided with protective pads 12a and comfort pads 12b on the surface facing the inside of the helmet. When the chin guard portions 1a, 1b are in the open position, it is convenient for the helmet guards 3 to be easily put on and off if the pads 12 of the chin guard portions 1a, 1b are continuous to the pads 12 of the helmet shell 3 without interruption (FIG. 5). When the chin guard portions 1a, 1b are in the closed position, the pads 12 of the chin guard portions 1a, 1b abut tightly below the user's ear, but in the area of the ear itself, for comfort and hindrance Sufficient space for listening to the sound is provided. Wearing glasses is also possible in an easy and comfortable manner (FIG. 6). Further, the chin guard portions 1a and 1b and the pads 12 of the chin guard surfaces 6 of the chin guard portions 1a and 1b are preferably detachable. As a result of this detachability, different types of pads 12 having different thicknesses can be used to better adjust the helmet to different head sizes.

  In this way, the installation of the helmet is improved. Furthermore, the removable pad 12 can be more easily cleaned. Preferably, the helmet shell 3 further comprises protection for the neck with the pad (not shown in FIGS. 1-9).

  Further, in FIGS. 5 and 6, the fixing regions 7 of the two chin guard portions 1 a and 1 b each end at a side surface 16 facing the helmet shell 3, and this side surface is the closed position ( 6), when the chin guard portions 1a and 1b are in the open position (FIG. 5), they are in contact with the support surface 17 of the helmet shell 3 and are separated from the support surface 17. As a result of supporting the chin guard parts 1a, 1b to the helmet shell 3 in the closed position, better protection is provided when a force acts on the chin guard parts 1a, 1b from below. In particular, a fold 21 is formed on the side surface 16 and a support protrusion 22 is formed on the support surface 17 on each of the side surface 16 of the fixed region 7 of the chin guard portions 1 a and 1 b and the support surface 17 of the helmet shell 3. A step structure can be provided. When the chin guard portions 1a and 1b are in the closed position, these stepped portions engage with each other so that the support protrusion 22 is positioned at the fold 21 (FIG. 6). As a result, the shearing force between the chin guard portions 1a and 1b and the helmet shell 3 can be absorbed better (FIG. 6).

  FIG. 7 shows a perspective view of an embodiment of the helmet shell 3 of the protective helmet according to the invention, with the pad 12 omitted. The stepped configuration of the support surface 17 due to the formation of the support protrusions 22 can be seen in detail. In comparison with FIG. 8, which shows a perspective view of an embodiment of the chin guard portions 1a, 1b, so that the support protrusions 22 are accommodated in the folds 21 when the chin guard portions 1a, 1b are in the closed position. It can be seen how the support protrusions 22 are adjusted to the folds 21 of the side surface 16. In this state, the side surface 16 and the support surface 17 are in contact with each other. Further, FIG. 7 shows that the plate member 2 can be submerged in the step region 18 of the helmet shell 3 and the chin guard portions 1a, 1b to provide a smooth outer surface to the helmet shell 3 for the benefit of improved aerodynamics. ing.

  Further, FIG. 8 shows that the side surface 16 of the fixing region 7 joins the jaw guard surface 6 in an obtuse manner along the longitudinal extension of the side surface 16 via the end surface 20. Turning again to FIG. 7, it is shown that the helmet shell 3 includes a holding step 19. The end face 20 is located in contact with the holding step 19 of the helmet shell 3 especially when the chin guards 1a, 1b are in the closed position. Therefore, the force acting on the chin guard portions 1a and 1b from the front is better absorbed by the helmet. Further, FIG. 8 clearly shows how the pads 12 are provided on the surface facing the inside of the helmet in the chin guard portions 1a, 1b and the chin guard surfaces 6 of the chin guard portions 1a, 1b. The pad 12 of the chin guard surface 6 is preferably removable and can be prepared in different thicknesses for adjustment to different head sizes. Further, usually, pads 12 are also provided on the inner side surfaces of the chin guard portions 1a and 1b. However, they are not shown in FIG.

  FIG. 9 shows a detailed view of a portion of a perspective view of the protective helmet according to the present invention of FIG. 1 as viewed from below. In particular, possible embodiments for the closure surface 8 and the closure mechanisms 11, 14 are shown. As already mentioned, one of the closing surfaces 8 is provided with a groove 9 and the other closing surface 8 is provided with a spring 15 which is associated with this groove 9 (see also FIGS. 2 and 4). In position, the groove 9 and the spring 15 engage with each other. The connection joint 10 is also clearly shown. The closing mechanisms 11, 14 comprise a lever 14 that cooperates with the pin 11 in the illustrated embodiment. When the lever 14 is lifted, the pin 11 is released and, as a result of the biasing of the plate member 2, the two jaw guard portions 1a, 1b pivot to the closed position. Other embodiments are possible for the closure mechanisms 11,14. In any case, they must be sturdy and easy to use.

  In this way, a protective helmet is realized with the aid of the present invention that is easy to put on and take off and provides a good rest, especially in the jaw and neck regions. In this way, the “stripping behavior” is highly optimized. Furthermore, the helmet according to the present invention has excellent aerodynamic and aeroacoustic characteristics and provides excellent protection against wind, dust and cold. Applicants' primary tests have revealed that the helmet according to the present invention is the quietest full face visor helmet available at the moment.

Fig. 4 shows a perspective side view of an embodiment of a protective helmet according to the present invention, with the chin guard part in a closed state. FIG. 2 shows a perspective side view of the embodiment of FIG. 1 with the chin guard portion open. FIG. 2 shows a perspective front view of the protective helmet of the embodiment of FIG. 1 according to the invention, with the chin guard part in a closed state. FIG. 2 shows a perspective front view of the protective helmet of the embodiment of FIG. 1 according to the invention, with the chin guard part open. FIG. 5 shows a cross-sectional view of the view according to FIG. 4 with the chin guard part open. FIG. 4 shows a cross-sectional view of the view according to FIG. 3 with the chin guard part closed. 1 shows a perspective view of an embodiment of a helmet shell of a protective helmet according to the invention. FIG. 2 shows a perspective view of an embodiment of a chin guard part of a protective helmet according to the present invention with the chin guard part closed. FIG. 2 shows a detailed perspective view of the protective helmet of FIG. 1 as viewed from below.

Claims (11)

A helmet shell (3) that at least partially surrounds the user's head excluding the face area when used, a chin guard (1) that surrounds a lower part of the user's face area when used, a helmet shell (3), and a chin guard A visor (4) preferably arranged in a pivotable manner on the helmet shell (3) to cover the field opening between (1) and the chin guard (1), In a protective helmet comprising two parts (1a, 1b) that are movable relative to each other,
Each of the two chin guard parts (1a, 1b) is pivotally arranged on the helmet shell (3), and the two chin guard parts (1a, 1b) are arranged at the upper part of each of them. A protective helmet characterized in that they are connected to each other by means of a connecting joint (10). The two chin guard parts (1a, 1b) each have a chin guard surface (6) projecting laterally toward the inside of the helmet at the lower part thereof. Protective helmet as described in The chin guards (1a, 1b) are closed at the fixed region (7) located at the end facing the helmet shell (3) and at the end away from the helmet shell (3), respectively. A closed area (13) with a face (8),
The two closing surfaces (8) are spaced apart from each other when the two jaw guard parts (1a, 1b) are in the open position, and pivot the two jaw guard parts (1a, 1b). in the closed position which can be reached by, and wherein the abutting each other, the protective helmet according to claim 1 or 2. A closing mechanism (11, 14) for spatially fixing the two jaw guard portions (1a, 1b) with respect to each other when the two jaw guard portions (1a, 1b) are in the closed position, The protective helmet according to claim 3 , wherein the protective helmet is arranged in a region of (8). One of the closing surfaces (8) is provided with a groove (9) and the other closing surface (8) is provided with a spring (15) to be combined with the groove (9), in the closed position. Protective helmet according to claim 3 or 4 , characterized in that the groove (9) and the spring (15) engage with each other. The protective helmet according to any one of claims 1 to 5 , characterized in that the two chin guard parts (1a, 1b) are biased to an open position. Each of the fixed regions (7) of the two chin guard portions (1a, 1b) terminates in a side surface (16) facing the helmet shell (3), and this side surface includes the chin guard portion (1a, 1b) abuts one support surface (17) of the helmet shell (3) when in the closed position, and from the support surface (17) when the chin guard (1a, 1b) is in the open position. The protective helmet according to claim 3 , wherein the protective helmet is spaced apart. The side surface (16) of the fixed region (7) of the chin guard part (1a, 1b) and the support surface (17) of the helmet shell (3) are each configured in a step shape ,
The protective helmet according to claim 7 , characterized in that these stepped portions engage each other when the chin guard (1a, 1b) is in the closed position. The protective jaw according to any one of claims 2 to 8 , characterized in that the chin guard surface (6) is provided with a detachable pad (12) facing the interior of the helmet. helmet. The side surface (16) of the fixed region (7) joins the jaw guard surface (6) in an obtuse manner through the end surface (20) along the longitudinal extension of the side surface (16). The end face (20) contacts the holding shoulder (19) of the helmet shell (3) when the chin guard (1a, 1b) is in the closed position. The protective helmet according to any one of claims 3 to 9 . When the two chin guard parts (1a, 1b) are in the closed position, the visor (4) overlaps the two chin guard parts (1a, 1b) or the two chin guard parts (1a, 1b). A protective helmet according to any one of the preceding claims, characterized in that abuts against the lower edge of the visor (4).

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