Protective helmet

Abstract

The invention relates to a protective helmet having a shell (1) for distributing impact forces, having a head support ring (2) for placing on the head of a wearer of the protective helmet, and having an adjustment device (3) for adjusting the circumference of the head support ring (2) in order to adapt the head support ring to the head of the wearer, wherein the adjustment device (3) is guided through an opening of the shell (1) in order to be operated from the outside of the shell (1). The protective helmet according to the invention is characterized in that the adjustment device (3) is designed to tension a spring device (8) during the adjustment of the circumference, so that the tension of the spring device (8) acts to convert the head support ring (2) into a basic circumference.

Description

[0001] The invention relates to a protective helmet.

[0002] Protective helmets, in particular helmets for police or other emergency services, are primarily used to protect the wearer from the risk of mechanical injury. As with other types of helmet, the use of protective helmets also requires that in any case a certain circumference range is allowed for the safe wearing of the helmet by wearers with different head circumferences. One difficulty is that such a circumference adaptation usually requires the adjustment of the internal fittings of the protective helmet, which are naturally provided beneath the fixed outer shell of the protective helmet. The outer shell makes it difficult or prevents access to the internal fittings located thereunder.

[0003] US patent US 7870617 B2 from the prior art discloses a sports helmet with internal fittings which can be adjusted for their fit by means of flexible straps. These straps are guided through openings in the rear region of the outer shell and can thus also be adjusted and fastened when the sports helmet is being worn. Cover plates are provided which are then fastened from the outside to the outer shell to cover the openings and the straps guided through them.

[0004] The disadvantage of this prior art is that the removal of the sports helmet is tedious and time-consuming for the wearer. This is particularly true when the wearer is alone in doing this. As has established, it is appropriate to adapt the internal fittings to the head circumference of the wearer after the helmet has been put on. Conversely, for the removal of the helmet, it is expedient to expand the circumference of the internal fittings before removal and in this respect to release the internal fittings from the head of the wearer. However, with such sports helmets, it is difficult to do this, because for this purpose the wearer has to loosen the cover plates fastened in the rear head region of the outer shell first. Thus, a reliable quick removal is as good as impossible.

[0005] Therefore, starting from this prior art, it is the object of the invention to provide a protective helmet which on the one hand can adapt to different head circumferences of the wearer when the protective helmet is being worn and on the other hand reliably allows a quick release of this adaptability by the wearer to remove the protective helmet.

[0006] The key to the invention is the finding that by providing a resilient means (spring means) in the protective helmet, which is tensioned by adjusting the head circumference (head circumference) of the protective helmet for the respective wearer, so that the protective helmet is returned into a basic position, the protective helmet can be quickly taken off even by the wearer alone. Specifically, a release mechanism can then be provided by means of which and the tensioning of the spring means the protective helmet can be quickly converted into this basic position (basic adjustment / set) and thus can be comfortably removed. Typically, the basic adjustment comprises an adjustment to the maximum head circumference, so that in this basic adjustment the protective helmet is typically only loosely worn on the head of the wearer.

[0007] The proposed protective helmet comprises a shell for distributing impact forces, a head support ring for resting on the head of a wearer of the protective helmet, and an adjustment device for adjusting the circumference (periphery) of the head support ring to the head of the wearer, wherein the adjustment device is guided through at least one opening of the shell for operation from the outside of the shell. In order to guide the adjustment device through the at least one opening of the shell, it is sufficient to guide only a part of the adjustment device through the at least one opening. Here, the outside of the shell means the side of the shell facing away from the head of the wearer of the protective helmet. The head support ring comprises an arbitrary structure in principle, by which the protective helmet is at least partially supported on the head of the wearer and abuts against the periphery of the head of the wearer.

[0008] In particular, the proposed protective helmet can comprise a protective helmet for emergency services. These emergency services can comprise security forces, such as police or military forces, and fire brigades.

[0009] The proposed protective helmet is characterized in that the adjustment device is adapted to tension a spring device of the protective helmet during adjustment of the circumference (periphery), so that the tensioning of the spring device acts to convert the circumference (periphery) of the head support ring into a basic circumference (basic periphery). In other words, the spring device can be tensioned by actuation of the adjustment device, i.e. by adjusting the circumference (periphery) of the head support ring, so that this tensioning forces the head support ring into a state in which the circumference of the head support ring is a basic circumference (basic periphery). Preferably, this basic circumference of the head support ring corresponds to the maximum circumference (maximum periphery) of the head support ring. The reduction of the circumference of the head support ring from the maximum circumference then results in a tensioning of the spring device, which acts in the direction back to the maximum circumference. Therefore, preferably, the adjustment device is adapted to reduce the circumference of the head support ring from the basic circumference.

[0010] In principle, the spring device has no pre-tensioning when the circumference of the head support ring is identical to the basic circumference, wherein the basic circumference thus in particular corresponds to the maximum circumference. Therefore, a pre-tensioning of the spring device only occurs by the adjustment of the circumference by the adjustment device, which is different from the basic circumference. Preferably, however, the spring device has a pre-tensioning when the circumference of the head support ring is identical to the basic circumference. In other words, there is thus already a pre-tensioning in the basic state of the head support ring. In this way, it is ensured that the spring device already has a certain pre-tensioning in the maximum adjustment, so that the maximum circumference is actually also reliably (independent of friction losses) achieved. The reduction of the head circumference thus not only results in a pre-tensioning, but additionally increases the existing pre-tensioning.

[0011] It is possible that the at least one opening of the shell comprises a plurality of openings of the shell. Likewise, it is possible that the at least one opening of the shell comprises exactly one opening of the shell.

[0012] In principle, the adjustment device described above can be implemented in any way. The preferred embodiment of the protective helmet proposed is characterized in that the adjustment device has a button for adjusting the circumference by a rotational movement, which can be turned from the outside of the housing. Thus, the rotational actuation of the adjustment of the circumference (perimeter) can be performed from the outside of the housing.

[0013] The turnability from the outside of the housing can be realized in different ways. In particular, it can be the case that the button is guided through at least one opening. A further possibility will be explained further below.

[0014] In principle, the at least one opening can comprise any type of at least one opening. A further preferred embodiment of the protective helmet according to the application is characterized in that the at least one opening described above is a hole which is completely surrounded by the housing. In particular, the at least one opening can consist of at least one hole which is completely surrounded by the housing. Thus, a hole is understood to be an opening with a closed edge. Thus, a hole is in particular not a slot-like cutout (slotted recess). In principle, the at least one opening can be arranged at any position of the housing. Preferably, however, the at least one opening is arranged at the rear side of the housing.

[0015] A preferred embodiment of the protective helmet according to the application, the adjustment device comprises a cable structure, wherein the cable structure is adapted to exert a pulling actuation to the head support ring for adjusting the circumference. In particular, it can be the case that the cable structure is adapted to exert a pulling actuation to the head support ring for reducing the circumference. Preferably, the cable structure is coupled to the button. In principle, the cable structure can respond to any type of actuation of the button. It is particularly preferred that the cable structure is adapted to exert a pulling actuation to the head support ring for adjusting the circumference by turning the button.

[0016] According to a further preferred embodiment of the protective helmet proposed, the adjustment device is adapted to reduce the cable length of the cable structure by winding up (winding) the cable structure for adjusting the circumference of the head support ring. The cable length of the cable structure (rope structure) reduced in this way does not comprise the total length of the cable, since this cannot be changed in principle without separating a part of the cable structure. Rather, the cable length to be reduced refers to the length of the cable that is stretched out. Thus, the length of the cable that is stretched out comprises the part of the cable structure that is not wound up.

[0017] A preferred embodiment of the protective helmet proposed is characterized in that the cable structure is guided through at least one opening. Since the cable structure usually has a smaller diameter than the button, it is possible in this way to design the at least one opening to be very small, thereby impairing the integrity of the housing as little as possible. It is further preferred here that the button is arranged on the outside of the housing.

[0018] In principle, the head support ring can be configured arbitrarily. A further preferred embodiment of the proposed protective helmet is characterized in that the head support ring has two guide portions which are adapted to be displaced onto one another (displaced over one another) in order to adjust the circumference of the head support ring. Specifically, it is possible for the guide portions to form at least partially the circumference (perimeter) of the head support ring. As a result of this displacement onto one another, it is possible to adjust the portion of the circumference formed by the two guide portions, since the overlapping region of the guide portions contributes to the circumference only once. It is further preferred for the guide portions to be flexible. Flexible guide portions are more easily overlaid in order to form the perimeter (circumference) than rigid guide portions. Likewise, it is preferred for the head support ring to have a retaining structure for the guide portions to be passed over one another (guided over one another). It is also possible here for at least one guide portion to have the retaining structure and for the retaining structure to be adapted to the guide portions to engage one another. In this way, it is possible to ensure that the guide portions remain overlaid.

[0019] According to a preferred embodiment of the proposed protective helmet, the adjustment device and specifically the cable structure is adapted to displace the guide portions onto one another for adjusting the circumference. This displacement onto one another is relatively easy to achieve by applying a tensile force to the guide portions. Preferably, the guide portions also have corresponding guide openings, wherein the guide openings are at least partially aligned with one another and thus form a total opening (overall opening). The total opening thus comprises an opening which corresponds to the overlapping region of the two guide openings. Preferably, the area of the total opening is then adjusted by adjusting the perimeter of the head support ring. It is apparent that the greater the area of the total opening generally is, the higher the degree of overlap of the guide portions with respect to one another in the guide openings.

[0020] In principle, the spring device can be placed arbitrarily and coupled to other components of the protective helmet. According to a further preferred embodiment of the protective helmet, the spring device is connected to the guide portions and is adapted to apply a tensile force of the spring device to the guide portions as a spring force. In other words, as a result of the connection of the spring device to the guide portions, the stronger the spring force applied by the spring device to the guide portions, the stronger the spring device is tensioned. Specifically, the spring device can be connected to the guide portions in the region of the corresponding guide openings.

[0021] In principle, the spring device can also comprise a compression spring (pressure spring). Preferably, however, the spring device has a tensile load spring (tension spring) for applying a spring force to the guide portions. Here and in the following, the term tensile load spring is to be understood as a device and any components which are adapted to apply a tensile force to an elongated portion. Specifically, the tensile load spring can comprise a helical tension spring or a rubber band. In principle, the spring device can be arranged at any location of the protective helmet. Preferably, the spring device is arranged substantially at the total opening. It is thus possible to position the spring device in a particularly space-saving manner.

[0022] In principle, the adjustment device can act on only one of the guide portions. However, the preferred embodiment of the proposed protective helmet is characterized in that the adjustment device is adapted to exert a tensile force in each case in substantially opposite directions on the guide portions in order to adjust the circumference of the head support ring. In other words, the tensile force exerted by the adjustment device on one of the two guide portions is substantially opposite (inverted) to the tensile force exerted by the adjustment device on the other of the two guide portions. Thus, a tensile force is exerted on both guide portions.

[0023] In particular, it can be the case that the cable structure is particularly suitable for exerting a tensile force in each case in substantially opposite directions on the guide portions. It is also preferred that the spring device is arranged between the cable structure and the fastening point of the respective guide portion.

[0024] A further preferred embodiment of the proposed protective helmet is characterized in that it has a neck protection portion to substantially completely cover the neck of the wearer, which is arranged at the lower edge of the outer shell. The lower edge of the outer shell is the edge that is below from the perspective of the wearer of the protective helmet. It is further preferred that the guide portions are offset in the vertical direction with respect to the outer shell and are arranged in such a way that they are covered by the neck protection portion. In other words, the guide portions are not arranged at the same vertical height as the outer shell. The vertical direction is likewise defined with respect to the wearer of the protective helmet. In other words, if there were no neck protection portion, the guide portions would be located such that they would not be covered by the outer shell. This configuration of the guide portions enables them to act as low as possible on the head of the wearer of the protective helmet, thus ensuring safe retention of the protective helmet.

[0025] According to the invention, according to a preferred embodiment of the protective helmet, the adjustment device is adapted to be released by a release actuation, so that the spring device, due to its pretensioning, converts the head support ring into a substantially circumferential length. This includes a so-called "quick release" mechanism. In principle, the release actuation can comprise any type of actuation. Preferably, the release actuation comprises a pressure actuation.

[0026] According to a further preferred embodiment of the proposed protective helmet, it is provided that the protective helmet has at least one inner layer portion which is received by the outer shell to dampen the impact force, and the head support ring has a main section for fastening the head support ring to the at least one inner layer portion. In this case, it can additionally be provided that the head support ring is also fastened directly to the outer shell. In principle, the at least one inner layer portion can also be arranged adjustably with respect to the outer shell. However, preferably, the at least one inner layer portion is arranged in a fixed position with respect to the outer shell. A secure fitting of the protective helmet can thus be achieved. In particular, it can be provided that the at least one inner layer portion is preferably firmly connected to the outer shell.

[0027] The preferred embodiment of the proposed protective helmet is characterized in that the main section is connected to the at least one inner layer portion in such a way that the at least one inner layer portion maintains its position relative to the outer shell when adjusting the circumference of the head support ring. Preferably, the at least one inner guide portion maintains its position relative to the outer shell when the guide portion is displaced. It can thus be achieved that the adjustment of the circumference (periphery) can be achieved substantially without adjusting the main section.

[0028] The main section above can in principle be configured arbitrarily. However, a further preferred embodiment of the protective helmet according to the application is characterized in that the main section is substantially T-shaped, having two elongated and oppositely extending arms for fastening to the respective guide portion and having an elongated central portion for fastening in the central region of the outer shell. In other words, the arms are for fastening to the guide portions and the central portion is for fastening, preferably to another structure, possibly to the inner layer portion. It is also preferred that the arms form a part of the circumference (periphery) of the head support ring. In principle, the arms and the central portion can extend arbitrarily on the protective helmet. Preferably, the arms extend substantially along the side edges of the outer shell. The term side edge refers to a side of the outer shell in a transverse direction relative to the viewing direction of the wearer of the protective helmet. It is also preferred that the central portion extends substantially along the ridge line (Scheitellinie, vertex perpendicular) of the outer shell. The term ridge line also relates to the wearer of the protective helmet. This is a centrally extending section on the outer shell surface with respect to the transverse direction, likewise with respect to the viewing direction of the wearer.

[0029] Further advantageous and preferred embodiments are obtained from the following description with reference to the drawings. In the drawings only one exemplary embodiment is shown.

[0030] Figure 1 a detailed internal view of an exemplary embodiment of a protective helmet according to the application is shown,

[0031] Figure 2 a rear external view of a protective helmet in Figure 1

[0032] Figure 3 a complete internal view of a protective helmet from Figure 1

[0033] Figure 4 a detailed view of the head support ring of a protective helmet in Figure 1

[0034] Figure 5 a detailed view of the head support ring of a protective helmet in Figure 1

[0035] ​​​​Figure 6 An internal view of the protective helmet is shown in a schematic view in cross-section Figure 1 with the padding cover removed.

[0036] Figure 1 A detail of the protective helmet is shown in Figure 2 and 3 The protective helmet is a protective helmet for police forces. The protective helmet has a shell 1 and a head support ring 2 arranged inside the shell 1, in which Figure 2 The shell can be clearly seen. The head support ring 2 is a part of the protective helmet which serves essentially for the protective helmet to be fitted on the head of the wearer as precisely as possible, in particular. Figure 6 The head support ring 2 is shown in a state arranged inside the shell 1.

[0037] The protective helmet also has an adjustment device 3 by means of which the circumference (periphery) of the head support ring 2 can be adapted to the corresponding head circumference of the wearer of the protective helmet.

[0038] The adjustment device 3 here comprises a rotatable button 4 and a cable structure 5, as shown in Figure 2 The button is arranged outside the shell 1. The cable structure 5 comprises two individual cables 6a, b in total which are fastened to the button 4 so that they can be wound onto the button 4 by means of a rotation of the button 4.

[0039] The individual cables 6a, 6b are guided from the button 4 through an opening of the shell 1 into the interior of the shell 1, which opening is arranged essentially underneath the button 4. There, as shown in Figure 1 The individual cables 6a, 6b are connected to flexible guide portions 7a, 7b of the head support ring 2, respectively. The opening is covered here by a padding cover 17 arranged on the inner side of the shell 1 and is therefore not shown.

[0040] A rotation of the button 4 causes the guide portions 7a, 7b to be displaced one onto the other (onto each other) by means of the tensile force exerted by the cable structure 5 consisting of the individual cables 6a, b. Figure 4 The basic state of the guide portions 7a, b and thus of the head support ring 2 is shown, which corresponds to the maximum circumference (periphery) of the head support ring 2. This maximum circumference (periphery) of the head support ring forms the basic circumference here. A spring device 8 consisting of a tension spring 9 is fastened to the guide portions 7a, b, as can be seen. In this state with the maximum circumference of the head support ring 2, the spring device 8 already has a pre-tensioning. This pre-tensioning serves to convert the circumference of the head support ring 2 into the basic circumference or to leave the head from the circumference of the ring 2 in the basic circumference.

[0041] On the other hand, in Figure 5In the diagram, the guide portions 7a, 7b have been displaced one onto the other (onto one another) by means of the tensile actuation of the cable structure 5 just described, so that the circumference of the head support ring 2 is reduced from the basic state. It can be seen that the tensile forces exerted by the individual cables 6a, b are directed substantially oppositely in their directions, respectively.

[0042] The displacement of the guide portions 7a, 7b and the reduction of the circumference of the head support ring 2 also results in the spring device 8 being further tensioned. This further tensioning acts in the direction of the displacement of the guide portions 7a, 7b back to the basic state with the maximum circumference, i.e. with the basic circumference, in the same manner as the pre-tensioning already present in the basic state.

[0043] The guide portions 7a, 7b obviously have corresponding guide openings 11a, 11b, which are aligned with one another and form a total opening 12. The size of the total opening 12 obviously depends on how far the guide portions 7a, 7b are displaced one onto the other. From Figure 4 and 5 It can be seen that, in the state in which the circumference of the head support ring 2 is reduced, the area of the total opening 12 is greater than in the basic state, due to the higher degree of overlap of the guide portions 7a, b.

[0044] The spring device 8, which consists of the tension spring 9, is connected to the guide portions 7a, 7b at the fastening points 13a, 13b of the cable structure 5 and thus in the region of the corresponding guide openings 11a, 11b. The spring device 8 is thus substantially arranged within the total opening 12.

[0045] The cable structure 5 is released by pressure actuation of the button 4. The pre-tensioning of the spring device 8 causes a virtually simultaneous return to Figure 4 the state shown, in which the circumference of the head support ring 2 again corresponds to the basic circumference.

[0046] By Figure 2 It can be seen that, in addition to the outer shell 1, the protective helmet first of all has a further neck protection 14, which is arranged vertically below the outer shell 1, Figure 3 The inner side of the neck protection 14 can also be seen. It can be seen that the guide portions 7a, 7b are arranged vertically offset with respect to the outer shell 1 and thus in the region of the neck protection 14.

[0047] Secondly, the protective helmet also has an inner layer portion 16, as shown in Figure 6 In the view of Figure 6 the inner layer portion 16 and the main portion of the guide portions 7a, 7b is covered by a padding cover 17 (cover with padding), which is generally and as shown in Figure 3 partially removed.

[0048] In addition to the guide portions 7a, 7b, the head support ring 2 comprises a main section 18, the central portion 19 of which is firmly connected to the inner layer portion 16 and the arms 20a, b of which are connected to the guide portions 7a, b.

Claims

1. A protective helmet comprising a shell (1) for distributing impact forces, a head supporting ring (2) for being placed on the head of a wearer of the protective helmet, and an adjusting device (3) for adjusting the circumference of the head supporting ring (2) to the head of the wearer, wherein The adjustment device (3) is guided through at least one opening of the housing (1) for operation from the outside of the housing (1), characterized in that the adjustment device (3) is adapted to tension a spring device (8) of the protective helmet during circumference adjustment, a circumference reduction of the head support ring (2) starting from a maximum circumference resulting in a tensioning of the spring device (8), so that the tensioning of the spring device (8) acts to convert the circumference of the head support ring (2) to a basic circumference corresponding to the maximum circumference of the head support ring (2).

2. Protective headgear as claimed in claim 1, characterized in that The adjustment device (3) has a button (4) for adjusting the circumference by a rotational movement, which button (4) can be turned from the outside of the housing (1).

3. Protective headgear as claimed in claim 2 wherein, The button (4) is guided through the at least one opening.

4. A protective helmet as in any of claims 1-3, characterized in that The at least one opening is a hole completely surrounded by the housing (1).

5. A protective helmet as defined in claim 4, characterized in that The at least one opening is arranged on the rear side of the housing (1).

6. The protective headgear of claim 2, wherein, The adjustment device (3) comprises a cable structure (5), wherein the cable structure (5) is adapted to apply a tensile force actuation to the head support ring (2) for adjusting the circumference.

7. A protective helmet as defined in claim 6, characterized in that The cable structure (5) is coupled to the button (4); the cable structure (5) is adapted to apply a tensile force actuation to the head support ring (2) for adjusting the circumference by turning the button (4).

8. A protective helmet as defined in claim 6, wherein The adjustment device (3) is adapted to reduce the cable length of the cable structure (5) by winding up the cable structure (5) for adjusting the circumference of the head support ring (2).

9. The protective headgear of claim 6, wherein, The cable structure (5) is guided through the at least one opening.

10. A protective helmet as defined in claim 9, characterized in that The button (4) is arranged on the outside of the housing (1).

11. The protective headgear of claim 6, wherein, The head support ring (2) has two guide portions (7a, 7b) adapted to be displaced one onto the other for adjusting the circumference of the head support ring (2).

12. Protective headgear as claimed in claim 11 wherein, The guide portions (7a, 7b) are flexible.

13. The protective headgear of claim 11, wherein, The guide portions (7a, 7b) at least partially form the circumference of the head support ring (2).

14. The protective headgear of claim 11, wherein, The adjustment device (3) is adapted to displace the guide portions (7a, 7b) one onto the other for adjusting the circumference.

15. The protective headgear of claim 11, wherein, The cable structure (5) is adapted to displace the guide portions (7a, 7b) one onto the other for adjusting the circumference.

16. The protective headgear of claim 11, wherein, The guide portions (7a, 7b) have respective guide openings (11a, 11b), wherein the guide openings (11a, 11b) are at least partially aligned with each other and thus form a total opening (12).

17. A protective helmet as defined in claim 16, wherein The area of the total opening (12) is adapted by adjusting the circumference of the head support ring (2).

18. The protective headgear of claim 16, wherein, The spring device (8) is arranged at the total opening (12).

19. The protective headgear of claim 11, wherein, The spring device (8) is in particular connected to the guide portions (7a, 7b) in the region of the respective guide openings (11a, 11b) and is adapted to apply a tension of the spring device (8) as a spring force to the guide portions (7a, 7b).

20. The protective headgear of claim 11, wherein, The spring device (8) has a tensile load spring (9) for applying a spring force to the guide portions (7a, 7b).

21. The protective headgear of claim 11, wherein, The adjustment device (3) is adapted to apply a counteracting tensile force to the guide portions (7a, 7b) to adjust the circumference of the head support ring (2) accordingly.

22. The protective headgear of claim 11, wherein, The cable structure (5) is adapted to apply a counteracting tensile force to the guide portions (7a, 7b) to adjust the circumference of the head support ring (2) accordingly.

23. The protective headgear of claim 11, wherein, The spring device (8) is arranged between the cable structure (5) and a fastening point (13a, 13b) of the respective guide portion (7a, 7b).

24. A protective headgear as claimed in any one of claims 11 to 23 wherein, The protective helmet has a neck protection (14) to completely cover the neck of the wearer, the neck protection (14) being arranged at a lower edge of the outer shell (1).

25. Protective headgear as claimed in claim 24 wherein, The guide portions (7a, 7b) are offset in a vertical direction relative to the outer shell (1) and are arranged such that they are covered by the neck protection (14).

26. The protective headgear of claim 1, wherein The spring device (8) has a pre-tension when the circumference of the head support ring (2) is identical to the basic circumference, and wherein the adjustment device (3) is adapted to be released by a release actuation such that the spring device (8) due to its pre-tension converts the head support ring (2) to the basic circumference.

27. Protective headgear as claimed in claim 26 wherein, The release actuation comprises a pressure actuation.

28. Protective headgear as claimed in claim 1 wherein, The protective helmet has at least one inner layer portion (16) which is received by the outer shell for damping impact forces, and the head support ring (2) has a main section (18) for fastening the head support ring (2) to the at least one inner layer portion (16).

29. Protective headgear as claimed in claim 28 wherein, The at least one inner layer portion (16) is arranged in a fixed position relative to the outer shell (1).

30. Protective headgear as claimed in claim 28 wherein, The at least one inner layer portion (16) is connected to the outer shell (1).

31. Protective headgear as claimed in claim 28 wherein, The main section (18) is connected to the at least one inner layer portion (16) such that the at least one inner layer portion (16) maintains its position relative to the outer shell (1) when adjusting the circumference of the head support ring (2).

32. Protective headgear as claimed in claim 28 wherein, The head support ring (2) has two guide portions (7a, 7b) which are adapted to be displaced onto one another, the main section (18) is connected to the at least one inner layer portion (16) such that the at least one inner layer portion (16) maintains its position relative to the outer shell (1) when the guide portions (7a, 7b) are displaced.

33. The protective headgear of claim 28, wherein, The head support ring (2) has two guide portions (7a, 7b) which are adapted to be displaced onto one another, the main section (18) is T-shaped with two elongated and oppositely extending arms (20a, 20b) for fastening to the respective guide portions (7a, 7b) and with an elongated central portion (19) for fastening in a central region of the outer shell (1).

34. Protective headgear as claimed in claim 33 wherein, The arms (20a, 20b) extend along a side edge of the outer shell (1).

35. Protective headgear as claimed in claim 33 wherein, The central portion (19) extends along a ridge line of the outer shell (1). The central portion (19) extends along a ridge line of the outer shell (1).

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