DE4329297A1 - Bicycle crash helmet - Google Patents

Abstract

The present invention relates to a helmet, in particular a bicycle crash helmet, made of plastic and a method for its production. To achieve the object of the invention, to make available a helmet made of plastic which can be fabricated with significantly lower production costs but with increased resistance to loading, it is proposed to produce the helmet with double walls (2, 3) made of blown plastic. In addition, it is intended to provide means which effect a reinforcement of the walls (2, 3) of the helmet (1) in the case of pressure loading towards each other, these means preferably being able to be implemented in the form of apertures (for example 30). <IMAGE>

Description

The invention relates to a helmet, in particular a bicycle helmet made of plastic. For this it is known the bike helmets either made of thermoformed plastic or to produce a foamed plastic. In both cases the manufacturing costs are extremely high, what the very desirable and necessary for security reasons use of such bicycle helmets in practice impaired. Add to that the bike helmets thermoformed plastic the disadvantage that this is relative are heavy. Bicycle made of foamed plastic Helmets can only be foamed in certain colors become. Also a complete disposal of the helmets according to the current state of the art is not always guaranteed continuous

The object of the invention is in contrast first in a helmet, especially plastic create that with much lower manufacturing costs than the known plastic helmets can be fabricated where but the resistance to the stresses e.g. B. should not be affected in a fall.

The solution to this problem is first out in a helmet Seen plastic that is double-walled. The double wall ity combines the advantage of being extremely resilient speed and, above all, damping effect due to the enclosed Air against that in the event of a fall from the helmet  forces to be absorbed with the further advantage of its very light weight of this helmet.

The above advantages are synergistic through the Characteristic of the existence of the double wall of a blown supports its plastic. On the one hand this results a significant reduction in manufacturing costs since the Helmet can be made in a single molding process can, and on the other hand is a blown plastic elastic, but of a certain hardness and thus z. B. especially suitable for a bicycle helmet. After all the blown plastic can have a relatively thin wall thickness have what is essential to the desired weight loss contributes. In contrast to foamed helmets (e.g. from Sty ropor) can the helmet according to the invention in the case of a lead deformation in a simple way back out gangs are brought out by the deformed area heated by hot water or on a hair dryer or the like becomes. Previous dents "snap" as it were in the original form. There is also the possibility ability to customize the helmet according to customer requirements colorize what color when using styrofoam was previously not possible. The plastic can even Ge odoriferous substances are added, which have the advertising effect or Sale of such helmets, for example special helmets for Children.

The one-piece of the helmet according to claim 3 has the front part that the com plette helmet shell can be produced, therefore no longer any assembly or gluing steps are necessary perform. There is also no risk of glue arise with mechanical or thermal stress loosen the helmet.  

The multi-shell design of the helmet according to the Erfin manure has the advantage that the cavity - if desired - filled or laid out with special insulation material can what for certain purposes or in particular Insulation material itself, which is not injected or injected can be foamed, can be important.

To increase the deformation resistance of the invention ß helmets or bicycle helmets are provided which stiffen the walls of the helmet under pressure but also when the helmet is twisted ken. This creates a helmet with the double-walled construction create, which regards the technical requirements Fully corresponds to firmness and also the egg Properties of conventional, for example made of polystyrene standing helmets (bicycle helmets) far exceeds.

The stiffening has the advantage that if the User and impact with the helmet protected Head on a hard object, pavement or the like the helmet according to the invention has a greater impact energy can absorb as a helmet that has no stiffeners having. With the latter it can happen that already with a smaller impact the two helmet walls are against the Touch the joint and the impact that is still present energy has an undamped effect on the driver's head.

It is expedient as a means of stiffening at least a breakthrough provided, the walls of which are ge are closed, d. H. a connection between outer and effect inner wall in the area of the breakthrough. The wan breakthroughs cause the walls to stiffen of the helmet to each other and therefore an increased suitability for shock absorption. This configuration has the additional Liche advantage that it offers the possibility of the through  breaks in the blowing process for a one-piece helmet ask or at least prepare. Conveniently can the two walls in the area of the breakthroughs which are shaped and then cut out where through the breakthroughs in question. Next The breakthroughs have the additional benefits Lichen advantage that it for air circulation between Care for the head of the user and the inside of the helmet.

Several openings are therefore expediently provided and elongated to improve airflow and oriented in the longitudinal direction of the helmet.

The subject of claim 8 has a manufacturing technical advantages, on the other hand it has a certain effect Damping behavior in the area of the breakthroughs due to the sloping walls.

To further increase the stiffness of the helmet expediently further on the outer and / or inner Wall ribs may be provided, which are preferably longitudinal are. This also increases the rigidity increases.

Other measures that increase the stiffness of the helmet are described in subclaims 11-16. With this you can the relevant legal regulations or Nor at home and abroad.

Can within the cavity formed by both walls a ge between walls opposite each other know distance A, what the manufacture of the helmet in Blowing process facilitated.  

There is also the possibility of stiffening or Er Increasing the damping effect the cavity between the two Walls with a suitable material, especially art foam material.

As an alternative, there is also the possibility of especially with the two-part design of the helmet, with particles of foamed plastic as an additional Fill in shock absorbers. This will give you the opportunity created the entire helmet from recyclable material to manufacture.

According to an alterna tive embodiment of the invention, the entire cavity un overpressure.

Claims 20-24 show further expedient configurations to increase the shock absorption property of the er helmet according to the invention.

Because of the double-walled construction of the helmet according to the invention can the hardness and / or wall thickness of the plastic on the Helmet dimensions and / or the desired impact resistance be coordinated.

Appropriate materials for producing the invention ß helmets are given in claim 26.

Due to the manufacturing of the helmet there is a blowing process the possibility of using the plastic material yourself luminous, fluorescent dyes and color pigments to provide. With the previous polystyrene helmets, this had to be done each with an additional one on the styrofoam helmet bringing foil can be realized. The same applies to the Use of plastic material, which in the case of Er  can even be provided with odorants where a special one, especially for children's bicycle helmets "Marketing Gag" is made possible.

In order to injure the user by hitting the To avoid helmets in the event of an impact on the nose edge, is advantageously provided according to claim 30 that the front side facing the face of the user a central recess of the helmet is provided, whereby the edge effect of the front of the helmet is reduced becomes.

Expediently, fans can be provided in the area of the openings wheels can be provided, thereby improving the purging breakthrough is guaranteed. The fan wheels can be driven by the airstream or even by a solar cell, which z. B. on the outside of the outer wall of the helmet.

Claims 34-37 relate to further refinements of Invention using specially designed Air outlet openings, to influence the damping ver holding the helmet.

The present invention further relates to a fall helmet, in particular motorcycle helmet, which is characterized by it is that he has a helmet according to any one of claims 1-37 has as base body and this base body on the outside an additional helmet shell in solid Verbund carries. Conventional helmets are made of styrofoam consequently through the new basic body made of plastic and double wall construction replaced.

Finally, the invention relates to a method for manufacturing a helmet, especially a bicycle helmet  one or more of claims 1-38, which thereby is characterized in that the helmet is made within a shape a plastic hose is blown so that the hose itself within a cavity of the form to the helmet forming double wall. This can correspond to the helmet can be manufactured in a particularly simple manner, at the same time all the advantages of this the plastic used to make the helmet can be.

It is particularly advantageous that with the blowing process at the same time the stiffeners in the form of wall areas in the helmet can be brought in mutually touch and then cut out, causing Breakthroughs arise, on the one hand the stiffening and secondly, serve to ventilate the helmet.

Appropriate embodiments of the invention will be described next explained using the figures. Show it:

Figure 1 shows a bicycle helmet according to the invention in side view.

Figure 2 is a section along the line II in Fig. 1.

Figure 3 is a section through a form with an inserted hose that is to be blown to the Doppelwandi gene bicycle helmet.

Fig. 4 shows a further embodiment of the bicycle helmet according to the Invention in the Seitenan view;

Fig. 5 is a section along the line III-III in Fig. 4;

FIG. 6 shows a top view of the front part of the helmet according to the bicycle helmet according to FIG. 4;

Fig. 7-10 each show sectional views of possibilities of stiffening the helmet walls;

FIG. 11 is sectional view of the Helmwandungen with additional plastic layer;

Fig. 12 shows a further embodiment of the bicycle helmet according to the invention in the Be tenansicht;

Fig. 13 is a section along the line IV-IV in Fig. 12 with a further execution possibility for producing a stiffener such as

Fig. 14-16 partial sections through the helmet with under different design options of stiffening on a larger scale as well

Fig. 17 shows a further embodiment of helmet OF INVENTION to the invention, having the fan wheel in the area of the openings, in cross-sectional view of the relevant portion.

The helmet, here bicycle helmet 1 , is - as Fig. 2 shows - double-walled, that is, it consists of an outer wall 2 and egg ner inner wall 3 , which define a closed cavity 4 on both sides. At their ends 5 , the walls 2 , 3 also merge the cavity 4 outwards into one another. The walls 2 , 3 with their end faces 5 are thus an integral part of the bicycle helmet 1 forming part made of a suitable plastic, before polyethylene.

On the surface 3 'of the inner wall 3 usual damping strips 6 made of foamed plastic or rubber and the usual chin straps 7 can be attached. For this purpose NEN (not shown), the two walls 2 , 3 penetrating recesses can be provided, in the molded parts 40 , which carry the chin straps 7 , are inserted, with a secure connection by means of a press fit, tongue and groove connection or the like.

The cavity 4 can expediently be connected to the outside air through small air passage openings. In addition to this or instead of these openings 8 , larger openings 8 'can also be provided in their diameter, which are closed with a pressure relief valve, preferably covered with an externally attached valve 9 . In the event of an impact, the impact force results in pressure on the two wall parts 2 , 3 in the direction of the cavity 4 . This applies in particular to the outer wall 2 . This compresses the volume of the cavity 4 . To achieve a desired elastic compliance of the helmet, it is advantageous if the air in the cavity 4 can penetrate through the openings 8 , 8 'to the outside. Here, a certain braking of the passage of air can prove to be an advantage. This is achieved in the example of the openings 8 by a correspondingly small hole diameter and in the example of the openings 8 'by a sheet of plastic or rubber that presses with its own elastic force from the outside against the opening 8 ', but this elastic force from the can be overcome from flowing air.

The blade 9 is attached to the cutting line 10 on the outside of the helmet 1 . Other arrangements in this regard would also be possible.

Fig. 3 shows purely schematically the blowing of such a helmet with the help of a mold 11 , which has a recess 12 corresponding to the outer dimensions of the helmet to be manufactured. In this recess 12 or Ausspa tion, a hose 13 is inserted, the device 14 is inflated via the Luftlei and cured under heat in the desired manner.

It is also essential that in this manufacturing method, fastening slots for the chin straps 7 are incorporated into the blown plastic in an advantageous manner. They have a higher tear-out strength than bicycle helmets, which are made of foamed plastic (e.g. polystyrene) or deep-drawn.

To manufacture the bicycle helmet, in particular recyclable plastic such as B. polyethylene, polypropy len, copolymer, polystyrene copolymer, Acryl-Butatien-Sty rol, ABS, polyamide or polycarbonate can be used. The Wall thickness, which are elasticity and hardness of the plastic adjustable according to the desired requirements.

The cavity 4 between the two walls 2 , 3 can be filled with egg nem foamed plastic. This can be done either in the form of a foam or by filling small balls made of foamed plastic, for example.

Fig. 4 shows a further embodiment of the bicycle helmet according to the invention with openings 30 , 31 arranged on the top, which cause an increase in the rigidity under pressure loading of the two walls 2 , 3 to one another and thereby the ability to absorb shock energy of the bicycle helmet 1 considerably improve.

The individual openings 30 , 31 have side walls 34 , 35 , which bind the outer wall 2 to the inner wall 3 ver, so that the remaining cavity 4 remains closed in itself.

As is clear from Fig. 5, the side walls z. B. 34 over a portion of the distance from the outer to the inner wall 2 or 3 towards each other and only in a lower area away from each other.

To further stiffen the bicycle helmet 1 , a rib 33 extending from the front to the rear in an arc shape is provided on each side of the bicycle helmet 1 , which additionally increases the strength.

As can be seen from Fig. 6, the breakthroughs z. B. 30 , 31 elongated and arranged in the longitudinal direction of the bicycle helmet 1 . As a result, in addition to the stiffness-increasing effect, a particularly good flushing of the head area of the user of such a bicycle crash helmet 1 is ensured. From Fig. 6 it is also clear that the individual openings such. B. 30 , 31 are arranged offset from each other, whereby the stiffness profile of the bicycle helmet 1 is further improved.

Furthermore, the laterally attached rib 33 is shown in FIG. 6 to further increase the stiffening.

Stiffening increases from a rib, compare che the rib 34 in Fig. 5, the inner wall 3 .

The manufacture of the openings 30 , 31 can also be explained with reference to FIG. 6. The bicycle helmet 1 consists of two walls 2 , 3 , which - as already mentioned - are made from a hose in the blowing process. After blowing, the tube walls 2 , 3 are pressed against one another via sub-areas 22 , 23 , 24 by means of tool parts, so that they bond to one another there. The regions 22 , 23 and 24 which are glued to one another are then cut out along the dash-dotted lines 10 .

The edges surrounding these areas 22 , 23 and 24 are formed by the two parts of the walls 2 , 3 which are sealed together there. This creates openings 30 , 31 or air passage openings through which the outside air can reach the top of the user's head.

At the same time, the resulting Wandab sections 2 ', 3 ' (see FIG. 7) provide a stiffening of the helmet, since these sections form an angle with the course of the otherwise "smooth" outer surfaces 8 , 9 of the helmet and hereby which can largely absorb impact energy acting in the direction of arrows 38 , 39 (cf. FIG. 7) on the helmet 1 in the event of a fall.

The aforementioned angle can, like the other execution examples show to be different.

It can also change in the course of the sections (see the waveforms in Figs. 8-10).

The cross-sectional view in Fig. 7 shows that each of these water wall sections 2 ', 3 ' in the direction of the other wall 2 , 3 towards or away from it. In this way, a wa structure is achieved, which, however, as shown in FIG. 6, does not extend over the entire area of the helmet 1 , but only over the partial areas where the explained impact resistance must be given.

Fig. 8 shows in section approximately analogous to II-II in Fig. 6, the two walls 2 , 3 in wave form, the waves being approximately rectified or in "synchronous" to each other. Again, the contours 16 , 17 of the "smooth" outer surfaces of the helmet 1 are indicated.

FIG. 9 shows a corresponding section of the two walls 2 , 3 likewise in wave form, but the waves of the walls 2 , 3 are directed opposite to one another or are not arranged “synchronously”. Here, too, the contours are indicated at 16 , 17 .

The teaching of this embodiment of the invention, the walls (see Fig. 7-9) or at least one wall (see Fig. 10) of the helmet 1 to the other wall from time to time, thereby allowing the helmet to be stiffened accordingly achieve, must not be present over the entire Helmbe rich. It is sufficient to provide this to those Helmbe who are at risk of collision in the event of a fall.

The embodiment of FIG. 10 shows that the outer wall 2 does not lead to the other wall 3 every now and then, but runs smoothly, so that only the inner wall 3 that is pulled before is led away from it for the purpose of stiffening to the outer wall 2 How this cuts from 3 'of the inner wall 3 in Fig. 10 illustrate.

The smoothness of the outer wall 2 in this exemplary embodiment gives the helmet 1 a particularly pleasing look, while the inner wall 3 ensures the desired rigidity and absorption of the impact energy in the event of a fall.

As the exemplary embodiments of FIGS. 8-10 show, the two walls 2 , 3 are still at a distance A from one another, where it is facilitated by the production in the blowing process. However, it goes without saying that the walls 2 , 3 merge into one another at the side edges or foreheads 5 as shown in the example in FIG. 10.

As the holes 8 in the example of FIG. 9 are intended to illustrate, even with these embodiments of the invention, it can be ensured that in the event of an impact, air inside can escape. Also, one can cover according to the illustration in the embodiment of Fig. 10 an air outlet opening with a valve of an elasti rule flap 9, whereby the damper 9 against continues through the opening 8 'exiting air a certain resistance ent. In principle, other valves could also be used. It goes without saying that the aforementioned air outlet options can also be provided in the other embodiments.

Fig. 11 shows that as an impact protection inside the helmet egg nes or several pads 18 can / may be provided, which consists of a viscoelastic foam. A
such foam has a particularly shock-absorbing effect. The particular advantage of this foam is that it is viscoplastic, ie it can adapt to the shape of the head according to the inner curvature of the helmet 1 and then maintains this adapted shape even when the helmet is removed from the head. This is cheaper than an inner lining made of an elastic foam, since in the latter case, the user must be offered several helmets, each with layers of different thickness from such an elastic foam.

The design of the helmet 1 according to FIGS. 12 and 13 is characterized in that the helmet parts forming the walls 2 , 3 are made of plastic as separate shells and then joined together at their edges 19 , preferably welded or glued, so that the between them cavity 4 is in turn closed abge.

As mentioned, the shell-shaped plastic parts of the helmet which form the outer wall 2 and the inner wall 3 can consist of thermoformed or injection-molded plastic. The walls 2 , 3 are made for themselves and then connected to each other, z. B. as explained above.

Between the walls 2 , 3 stiffeners are provided, which can be in one piece with at least one of the walls 2 or 3 (see FIG. 15).

Alternatively, these stiffeners can be manufactured according to FIG. 14 and connected to one of the walls, e.g. B. be glued. It is recommended that these stiffeners 26 a are also made of plastic. In the example of FIG. 13, these stiffeners 6 a and 6 b form a honeycomb pattern with the helmet walls 2 , 3 .

The aforementioned stiffeners 26 and also in the examples of FIGS . 14-16 explained possible embodiments of stiffeners are preferably provided on the entire helmet, but at least on the helmet area, which can be subjected to an impact energy in the event of a fall, at least as in Fig. 13 indicated by the arrow C.

As the drawings show, the stiffeners 26 a extend from one wall 2 or 3 in the direction of the other wall 3 or 2 . You can either run at an acute angle to the aforementioned walls ( Fig. 13) or at right angles ( Fig. 14-16).

By connecting, e.g. B. welding or bonding of the two helmet walls 2, 3 at their edges 19 of the cavity 4 inside of these walls located half is airtightly closed abge. In the event of a fall due to the impact of the helmet as additional damping, this compresses the air within these cavities and consequently absorbs the corresponding impact energy.

In addition, one could create an air overpressure either during manufacture or preferably via a valve within these cavities of the helmet. Hereby, in particular in a plastic material used for the walls 2 , 3 , greater elasticity is created by a corresponding amount of excess pressure, the desired resistance to impact energy and, above all, to absorb this impact energy.

If the material of the walls 2 , 3 is very hard, a certain overpressure in the cavities can be less than with your plastic material, which is somewhat more flexible. The prerequisite here is that there are no air outlet openings or bores in the walls 2 , 3 .

However, the invention can also be implemented with air outlet openings. This also allows, in addition to the absorption or damping of the impact energy by the Ver stiffeners 26 a, 26 b, air damping in such a way that in one of the plastic helmet parts preferably the outer wall 2 air outlet openings 8 are provided, which when compressing the both walls 2 , 3 due to an impact let the air in the cavity 4 austre th, but still provide some resistance to the air outlet. This resistance can be increased by if, with appropriate air outlet opening 8 'on the outside, the resistance of a flap 9 lying thereon is made of an elastic material, which is bent outwards by the air outlet. Alternatively, a valve can of course also be seen before.

However, it should be emphasized that the introduction of an overpressure as well as the provision of outlet openings not necessarily is necessary, but only a special additional Represents design.

Fig. 13 shows still on the inside provided Dämp Fung strip 6.

Fig. 15 shows an embodiment with webs 26 a, which are integral with one of the helmet walls, here the outer wall 2 . In this embodiment, there is a certain not too great distance A between the respective outer, to the other wall 3 directed end 20 of the web 26 a to the inner surface of the helmet wall 3 to the inner surface 3 'of the helmet wall 3rd

The example of FIG. 16 shows that webs 6 a of wall 2 engage with webs 6 b of wall 3 in a comb-like manner and form the stiffening. Distances A could also be provided here, if desired.

Fig. 17 shows the arrangement of a fan wheel 25 in the upper region of the opening 30 , which is rotatably supported via lateral shaft lugs 26 , 27 in the side walls 34 , 35 of the opening 30 . While driving is ensured here by a suction effect of the prevailing on the inside of the opening 30 , warming air.

The fan wheel can expediently also be provided by a corresponding motor unit (not shown) are driven by a likewise (not shown) solar cell is operated. The solar It is advisable to place the cell on the outside of the helmet bringing.

An advantage is that the two walls 2 , 3 of such a helmet made of the same recyclable plastic such. B. polystyrene, ABS, polyamide or polycarbonate can NEN. After removing the damping strips (foam elements) 6 and the straps 7 , such a bicycle helmet can be disposed of as a whole.

Polyethylene is the material used to manufacture the helmet prefers. But it could also be used: polypropylene, copo lymer, polystyrene copolymer, acrylic butatiene styrene, ABS, Polyamide, polycarbonate and PET.

The blown plastic material can be coated with noctilucent, fluorescent dyes, color pigments. This gives the helmet as soon as it is exposed to light was, lights off, so that the driver recognized better in the dark can be. It is also possible to use the plastic material for the helmet with special scents to thus a special sales gag for children's bikes to ensure helmets or the like.  

It should be noted that the helmet is not just a driving is to use a helmet, but very different application areas is accessible. In particular, the Helmet also used as a basic part of a motorcycle helmet be, which is the case with conventional motorcycle helmets styrofoam base part by the helmet according to this inven must be replaced.

The wall thickness, elasticity and hardness of the plastic are adjustable according to the desired requirements.

All features shown and described as well as their Combinations with one another are essential to the invention. At are one of the embodiments shown features analogously in one of the other exemplary embodiments applicable.

Reference list

1 bicycle helmet
2 wall
3 wall
4 cavity
5 end of string
6 damping strips
7 chin strap
8 opening
8 ′ opening
9 valve
10 cutting line
11 shape
12 recess
13 hose
14 air line
15 forehead
16 contour
17 contour
18 cushions
19 edge
20 end
25 fan wheels
26 axis approach
27 axis approach
32 rib
33 rib
34 wall
35 wall
40 molding

Claims (42)

1. helmet, in particular bicycle helmet made of plastic, characterized in that
that it is double-walled ( 2 , 3 ). 2. Bicycle helmet according to claim 1, characterized in
that it is made of blown plastic. 3. Bicycle helmet according to claim 1 or 2, characterized in
that it is in one piece. 4. Bicycle helmet according to claims 1 and 2, characterized in
that it consists of two separate, shell-shaped plastic parts, which form the outer ( 2 ) and inner wall of the helmet ( 1 ) at a distance from one another and are connected to each other. 5. Bicycle helmet according to one of claims 1 to 4, characterized in
that means are provided which stiffen the walls ( 2 , 3 ) of the helmet ( 1 ) to each other under pressure. 6. Bicycle helmet according to claim 5, characterized in
that as a means at least one opening (z. B. 30) is provided, the walls ( 34 , 35 ) are closed ge, ie a connection between the outer ( 2 ) and inner wall ( 3 ) in the region of the opening ( 30 ) cause. 7. Bicycle helmet according to claim 6, characterized in
that several openings ( 30 , 31 ) are provided, the openings ( 30 , 31 ) are elongated and are oriented in the longitudinal direction of the helmet. 8. Bicycle helmet according to claim 9 or 10, characterized in
that the distance between the walls ( 34 , 35 ) of the openings ( 30 , 31 ) - seen in cross section - from the outer wall ( 2 ) to the inner ( 3 ) at least over a portion of the distance from the outer ( 2 ) to the inner wall ( 3 ) reduced. 9. Bicycle helmet according to claim 7 or 8, characterized in
that the openings ( 30 , 31 ) are arranged offset with respect to their longitudinal alignment. 10. Bicycle helmet according to one of claims 1 to 9, characterized in
that the outer and / or inner wall ( 2 , 3 ) in particular longitudinally oriented ribs ( 32 , 33 ). 11. Bicycle helmet according to claim 5, characterized in
that for stiffening at least at the crash areas exposed to a crash areas one of the walls ( 2 , 3 ) of the helmet in the direction of the other ren wall ( 3 , 2 ) of the helmet and back and forth extending support sections. 12. Bicycle helmet according to claim 5, characterized in
for stiffening at least at the helmet areas exposed to a crash ei nem impact both walls ( 2 , 3 ) of the helmet in the direction of the other wall ( 3 , 2 ) of the helmet and back from it extending support sections. 13. Bicycle helmet according to claim 12, characterized in
that the support sections are / are provided as separate parts or sepa rates, in the surface one-piece, one part. 14. Bicycle helmet according to claim 12 or 13, characterized in
that the support sections in the walls ( 2 , 3 ) are formed. 15. Bicycle helmet according to claim 14, characterized in
that the support sections ( 2 ', 3 ') arc-shaped or wave-shaped. 16. Bicycle helmet according to one of claims 11 to 15, characterized in
that the support sections in the unloaded state un each other or to the adjacent walls ( 2 , 3 ) each have a distance A. 17. Bicycle helmet according to one of claims 1 to 15, characterized in
that the stiffening of the cavity ( 4 ) to increase the damping effect between the two walls ( 2 , 3 ) is foamed with a plastic. 18. Bicycle helmet according to one of claims 1 to 15, characterized in
that the cavity ( 4 ) between the two walls ( 2 , 3 ) is filled with particles of a foamed plastic ge. 19. Bicycle helmet according to claim 18, characterized in
that the entire volume between the walls ( 2 , 3 ) or cavities ( 5 ) is under positive pressure. 20. Bicycle helmet according to one of claims 11 to 19, characterized in
that webs ( 26 a, 26 b) made of plastic are provided as support sections, which are connected to at least one of the walls ( 2 and 3 ). 21. Bicycle helmet according to claim 20, characterized in
that the webs ( 26 a, 26 b) from one wall ( 2 or 3 ) to the other wall ( 3 or 2 ) of the helmet he stretch. 22. Bicycle helmet according to claim 21, characterized in
that the webs ( 26 a, 26 b) of a wall ( 2 or 3) extend directly to the inner surface of the other wall ( 3 or 2 ) of the helmet. 23. Bicycle helmet according to claim 22, characterized in
that the webs ( 26 a, 26 b) of a helmet wall with their outer end ( 14 ) have a certain distance (A) from the inside of the other helmet wall. 24. Bicycle helmet according to one of claims 20 to 23, characterized in
that the webs ( 26 a, 26 b) together with the walls ( 2 , 3 ) of the helmet form honeycombs in cross section. 25. Bicycle helmet according to one of claims 1 to 24, characterized by
a coordination of the hardness and / or wall thickness of the plastic to the helmet dimensions and the desired resistance to impact or fall loads. 26. Bicycle helmet according to one of claims 1 to 25, characterized by
the production from a recyclable plastic such as polyethylene, polypropylene, copolymer, polystyrene copolymer, acrylic butatiene styrene, ABS, polyamide or polycarbonate. 27. Bicycle helmet according to one of claims 1 to 26, characterized in
that the thickness of the walls ( 2 , 3 ) is 1.5 to 2 mm. 28. Bicycle helmet according to one of claims 1 to 27, characterized by
a plastic material, which is provided with afterglowing, fluorescent dyes or color pigments. 29. Bicycle helmet according to one of claims 1 to 28, characterized by
a plastic material that is provided with odorous substances. 30. Bicycle helmet according to one of claims 1 to 29, characterized in
that on the front facing the face of the user side of the helmet ( 1 ) a central recess ( 36 ) is provided. 31. Bicycle helmet according to one of claims 1 to 29, characterized in
that in the area of the openings ( 30 , 31 ) fan wheels ( 38 ) are provided, whereby an increased flushing of the openings ( 30 , 31 ) is ensured. 32. Bicycle helmet according to claim 31, characterized in
that the respective fan wheel ( 25 ) is driven by the wind. 33. Bicycle helmet according to claim 31, characterized in
that the respective fan wheel ( 25 ) is driven by a solar cell and the solar cell on the outside of the wall ( 2 ) is preferably attached in the side area. 34. Bicycle helmet according to claims 1 to 33, characterized in
that in one of the walls, preferably the outer wall ( 2 ), one or more air outlet openings ( 8 , 8 ') are provided. 35. Bicycle helmet according to claim 34, characterized in
that air outlet openings ( 8 ) are provided with such a small cross-section that this cross-section brakes the air outlet. 36. Bicycle helmet according to claim 34 or 35, characterized by
Air outlet openings ( 8 ) with a valve that brakes the air outlet. 37. Bicycle helmet according to claim 36, characterized in
that the valve is designed as a flat, elastic sheet ( 9 ) and is attached to the outer surface of the wall, and covers the respective opening ( 8 '). 38. helmet, in particular motorcycle helmet, characterized in that
that it has a helmet ( 1 ) according to one of claims 1 to 37 as the base body ( 40 ) and the base body carries an additional helmet shell in a fixed bond on its outside. 39. A method for producing a helmet, in particular a bicycle helmet according to one or more of the preceding claims, characterized in that
that the helmet is blown from a plastic tube ( 13 ) within a mold ( 11 ) such that the tube forms into a cavity ( 12 ) of the mold into a double wall ( 2 , 3 , 5 ) forming the helmet. 40. The method according to claim 35, characterized by
an adjustment of the wall thickness of the walls ( 2 , 3 ) to a desired value, z. B. in the range of 0.5 to 1 mm. 41. The method according to claim 36, characterized in
that the setting is made by choosing a hose with an appropriate thickness. 42. The method according to claims 39-41, characterized in
that the walls ( 2 , 3 ) over sections ( 22 , 23 , 24 ) after the blowing but before demolding are pressed together so that they connect to each other there, preferably glue 'that continues to close the sections ( 22-24 ) are cut out, causing ver with openings ( 30 , 31 ) with side walls ( 34 , 35 ).