Bellows assembly for an articulated bus

Abstract

The invention relates to a bellows assembly (1) for an articulated bus, in particular a bi-articulated bus, comprising an inner bellows (2) with a substantially U-shaped cross-section and an outer bellows (3) with a substantial U-shaped cross-section, said outer bellows (3) surrounding the inner bellows (2), wherein the inner bellows (2) has a first translucent region (21), and the outer bellows (3) has a second translucent region (31).

Description

[0001] Bellows arrangement for an articulated bus

[0002] Technical area

[0003] The invention relates to a bellows arrangement for an articulated bus and to an articulated bus, in particular a double-articulated bus, with such a bellows arrangement.

[0004] State of the art

[0005] Bellows assemblies belonging to the technical field mentioned above are known. Such bellows assemblies are arranged in articulated buses and double-articulated buses between two consecutive vehicle sections. The two vehicle sections are connected by a joint with a vertical axis of rotation, with a platform for passengers arranged above the joint, allowing people to move from one vehicle section to the other. The bellows assembly is typically arranged above this passage to protect it. An example of such a bellows assembly is described in WO 91 / 02672 A1 by Hübner Gummi und Kunststoff GmbH.

[0006] Such known bellows arrangements have the disadvantage of providing only poor thermal insulation. Accordingly, the interior of an articulated bus or double-articulated bus can experience uncomfortably warm temperatures in summer and uncomfortably cold temperatures in winter, or the articulated bus or double-articulated bus must be equipped with a disproportionately sized heating and air conditioning system to counteract the poor thermal insulation. However, such strong air conditioning leads to an unpleasant feeling for passengers in the platform area inside such bellows arrangements, just as if the air conditioning is inadequate, resulting in uncomfortably warm temperatures in summer and uncomfortably cold temperatures in winter.

[0007] In this text, the terms "bottom" and "top," as well as "longitudinal direction" and "bellows main plane" are used with reference to the bellows arrangement. These terms refer to the orientation of the bellows arrangement when the bellows arrangement is arranged in the area of ​​a joint between two consecutive vehicle sections of an articulated bus or double-articulated bus and surrounds a platform for passengers, protecting them from environmental influences. The "longitudinal direction" of the bellows arrangement corresponds to the longitudinal orientation of the articulated bus or double-articulated bus when the two vehicle sections between which the bellows arrangement is arranged are not tilted relative to each other but are arranged along a straight line. Furthermore, the "bellows main plane" corresponds to the plane oriented perpendicular to the "longitudinal direction" of the bellows arrangement.Furthermore, in this reference system, the inner bellows and the outer bellows have a "first end" and a "second end" between which the inner bellows and the outer bellows extend along the "longitudinal direction".

[0008] Description of the invention

[0009] The object of the invention is to provide a bellows arrangement for an articulated bus, in particular a double-articulated bus, belonging to the technical field mentioned at the outset, by means of which the comfort for the passengers of the articulated bus or double-articulated bus is increased in the area of ​​the bellows arrangement.

[0010] The solution to the problem is defined by the features of claim 1. According to the invention, the bellows arrangement comprises an inner bellows with a substantially U-shaped cross section and an outer bellows with a substantially U-shaped cross section, which outer bellows surrounds the inner bellows.

[0011] The bellows arrangement according to the invention is suitable for articulated buses with one or more joints, in particular also for double-articulated buses. In such an articulated bus or double-articulated bus, the bellows arrangement is arranged in the region of a joint between two consecutive vehicle parts of the articulated bus or double-articulated bus and generally surrounds a platform for passengers, protecting them from environmental influences. The bellows arrangement is preferably arranged such that the essentially U-shaped cross-section of the inner bellows and the essentially U-shaped cross-section of the outer bellows are aligned as an inverted U and therefore form vertical sides or side walls with their three limbs and a roof section arranged between them.Together with the platform for passengers, which forms a floor, the bellows arrangement thus forms a tube-like passage through which the two consecutive vehicle sections for the passengers of the articulated bus or double-articulated bus are continuously connected to each other.

[0012] To make the bellows arrangement suitable for articulated buses, the bellows arrangement preferably allows for lateral angling of the two consecutive vehicle parts between which the bellows arrangement is arranged, up to an angle between the consecutive vehicle parts of 30° or more. For this purpose, the bellows arrangement, when the consecutive vehicle parts are arranged parallel, preferably has a length of approximately 1.5 m to approximately 4 m, in particular 1.5 m to 2 m, measured in the longitudinal direction.

[0013] In the bellows arrangement, the inner bellows and the outer bellows are preferably arranged such that the outer bellows encloses the inner bellows along its three legs, ie on the left vertical side, the roof section and the right vertical side.

[0014] Due to the continuous double-walled arrangement with the inner bellows and the outer bellows, the bellows arrangement according to the invention results in significantly better thermal insulation in the area of ​​the bellows arrangement and in the joint area of ​​the articulated bus or double-articulated bus than with known single-walled solutions. As a result, less intensive vehicle air conditioning is sufficient to achieve comfortable temperatures inside the vehicle. The less intensive vehicle air conditioning, while still achieving more comfortable temperatures inside the vehicle, increases comfort for the passengers of the articulated bus or double-articulated bus in the area of ​​the bellows arrangement.

[0015] Advantageously, the inner bellows has a first translucent region and the outer bellows has a second translucent region, wherein the first translucent region and the second translucent region are aligned with one another.

[0016] In this context, "translucent" is defined as an area that has at least four times the transmittance of the other areas of the respective bellows in the wavelength range from 280 nm to 800 nm, especially from 400 nm to 700 nm. In particular, the transmittance in this wavelength range is at least 50%.

[0017] The fact that the translucent regions of the inner bellows and the outer bellows are aligned with each other preferably means that they at least partially overlap so that light from outside the bellows arrangement can pass directly through the two translucent regions into the interior of the bellows arrangement inside the inner bellows.

[0018] According to the invention, the inner bellows has a first translucent region and the outer bellows has a second translucent region, with the first translucent region and the second translucent region being aligned with one another. This provides the advantage that, on the one hand, improved thermal insulation can be achieved inside an articulated bus or double-articulated bus due to the inner bellows and the outer bellows. Furthermore, when the bellows arrangement is installed in an articulated bus, light from outside the articulated bus can penetrate through the bellows arrangement into the bellows arrangement. Both of these factors together increase travel comfort for the passengers of the articulated bus or double-articulated bus in the area of ​​the bellows arrangement.

[0019] Advantageously, in a straight position of the bellows arrangement, the outer bellows is spaced apart from the inner bellows. In the straight position of the bellows arrangement, the two consecutive vehicle parts between which the bellows arrangement is arranged are preferably aligned along the same straight line, ie, the two consecutive vehicle parts between which the bellows arrangement is arranged are preferably not angled to one another or have an angle of 0° to one another.

[0020] The distance between the two bellows is not required to be constant. In particular, the distance can be increased in a lower area adjacent to the passenger platform by extending the inner bellows downwards toward the platform, inward toward the outer edge of the platform.

[0021] By keeping the outer bellows spaced from the inner bellows in the straight position of the bellows assembly, the advantage is achieved that the bellows assembly can optimally adapt to the tilting of the two vehicle parts between which the bellows assembly is arranged when cornering the articulated bus or double-articulated bus comprising the bellows assembly. During such cornering, the folds of the inner bellows and the outer bellows may even temporarily touch.

[0022] Alternatively, it is also possible that in the straight position of the bellows arrangement, the outer bellows touch the inner bellows at least at one point.

[0023] Preferably, the first translucent region and the second translucent region are located on both vertical sides of the inner bellows and the outer bellows. This has the advantage that the first translucent region and the second translucent region in the bellows arrangement can create a side window-like impression.

[0024] Advantageously, the first translucent region and the second translucent region extend between a first height and a second height, while the vertical sides of the inner bellows and the outer bellows are non-translucent below the first height and above the second height.

[0025] In this text, "non-translucent" means "opaque," or that the transmittance in the wavelength range from 280 nm to 800 nm, in particular from 400 nm to 700 nm, is reduced by at least four times compared to the "translucent" ranges. Preferably, "non-translucent" or "opaque" means that in the wavelength range from 280 nm to 800 nm, in particular from 400 nm to 700 nm, the transmittance is at most 5%, particularly preferably at most 1%.

[0026] In a particularly preferred variant, the translucent areas are dimensioned and positioned to match the window arrangement in the adjacent vehicle parts between which the bellows assembly is located. This not only results in a uniform appearance both inside and out, but also provides a clear height reference point for passengers in the interior, facilitating orientation and ultimately improving interior safety.

[0027] In a variant thereof, the vertical sides of the inner bellows and the outer bellows are non-translucent only below the first height, only above the second height, or neither below the first height nor above the second height.

[0028] As an alternative to these variants, it is also possible for the first translucent area and the second translucent area to be located only in one of the two vertical sides of the inner bellows and the outer bellows or only in the roof section of the inner bellows and the outer bellows.

[0029] Advantageously, the roof section of the inner and outer bellows is not translucent. This has the advantage of creating a roof-like feeling for passengers in the interior.

[0030] Alternatively, it is also possible for the roof section of the inner bellows and the outer bellows to have at least one translucent area.

[0031] Advantageously, the inner bellows and the outer bellows are connected at a first end to a first common end profile and at a second end to a second common end profile. This has the advantage that the bellows assembly has greater inherent stability and can also be more easily installed between two consecutive vehicle parts of the articulated bus or double-articulated bus. The end profiles thus form bellows support plates. They serve to attach the bellows assembly to the adjacent vehicle parts between which the bellows assembly is or is to be installed.

[0032] The end profiles and the outer bellows are advantageously dimensioned such that the outer bellows does not protrude beyond the end profiles in cross-section. This has the advantage that the articulated bus or double-articulated bus is no wider in the area of ​​the bellows arrangement than the two vehicle parts between which the bellows arrangement is arranged. However, it is also possible for the end profiles and the outer bellows to be dimensioned such that the outer bellows protrudes beyond the end profiles in cross-section, at least in places.

[0033] In one variant, the inner bellows and the outer bellows are connected to a first common end profile only at a first end and are not connected to a second common end profile at a second end.

[0034] Alternatively, it is also possible for the inner bellows and the outer bellows to be connected to a common end profile neither at the first end nor at the second end in the longitudinal direction of the bellows arrangement.

[0035] If the inner bellows and the outer bellows are connected at a first end to a first common end profile and at a second end to a second common end profile, the inner bellows is preferably composed of a first longitudinal section and a second longitudinal section and the outer bellows is preferably composed of a third longitudinal section and a fourth longitudinal section, wherein the first longitudinal section and the third longitudinal section are fastened at one end to the first end profile and at an opposite end to a central profile and wherein the second longitudinal section and the fourth longitudinal section are fastened at one end to the second end profile and at an opposite end to the central profile.

[0036] The center profile is preferably attached to the joint of the articulated bus or to a joint of the double-articulated bus and thus ensures that the bellows arrangement deforms as desired, essentially along a circular arc, when cornering.

[0037] The center profile, the outer bellows, and the end profiles are advantageously dimensioned such that the outer bellows and the center profile do not protrude beyond the end profiles in cross-section. This has the advantage that the articulated bus or double-articulated bus is no wider in the area of ​​the bellows arrangement than the two vehicle parts between which the bellows arrangement is arranged. However, it is also possible for the center profile, the outer bellows, and the end profiles to be dimensioned such that the outer bellows and / or the center profile protrude beyond the end profiles in cross-section, at least in places.

[0038] Preferably, a lighting device, in particular an LED light strip, is arranged on the central profile, which extends along the central profile, in particular in the interior of the bellows arrangement in the interior of the inner bellows.

[0039] Particularly preferably, the LED light strip extends essentially along the entire center profile, i.e., from the left vertical side across the roof section to the right vertical side. This has the advantage that the center profile, and thus the center of the bellows arrangement, is clearly visible. This facilitates orientation and thus evacuation of the articulated or double-articulated bus in poor visibility conditions, for example, when smoke is developing inside the bus. Accordingly, this increases the safety of the passengers of the articulated or double-articulated bus.

[0040] In a variant thereof, no lighting device is arranged on the central profile, which extends along the central profile, in particular in the interior of the bellows arrangement in the interior of the inner bellows.

[0041] As an alternative to these variants, there is also the possibility that the bellows arrangement does not have a central profile.

[0042] Advantageously, the outer bellows is made of a silicone material reinforced with aramid fibers, at least in sections outside the second translucent area. This has the advantage of increasing safety during operation of an articulated or double-articulated bus with the bellows arrangement, as the silicone material reinforced with aramid fibers has fire-retardant properties.

[0043] Particularly preferably, the silicone material reinforced with aramid fibers is three-layered. This preferably comprises a layer of aramid fibers, in particular a fabric made of aramid fibers, coated with silicone on both sides.

[0044] In a variation, the aramid fiber reinforced silicone material can also be constructed differently.

[0045] As an alternative to these variants, the outer bellows is not made of a silicone material reinforced with aramid fibers, at least in sections outside the second translucent area.

[0046] Advantageously, the first translucent region and the second translucent region are made of a two-layer material. This has the advantage that the first translucent region and the second translucent region are more stable.

[0047] Advantageously, the first translucent region and the second translucent region are made of a polyester fabric, in particular a two-layer polyester fabric. This has the advantage that the first translucent region and the second translucent region are particularly durable during operation of the bellows arrangement and can withstand particularly numerous bending movements that occur when cornering an articulated bus or double-articulated bus with the bellows arrangement with only minimal wear.

[0048] Alternatively, it is also possible that the first translucent area and the second translucent area are made of a two-layer material but not of a polyester fabric, that neither the first translucent area nor the second translucent area are made of a two-layer material but are made of a polyester fabric, or that the first translucent area and the second translucent area are not made of a two-layer material and are not made of a polyester fabric.

[0049] Advantageously, the inner bellows is made of a polyester fabric, in particular of a single-layer polyester fabric, at least in sections outside the first translucent region.

[0050] Alternatively, it is also possible that the inner bellows is not made of a single-layer polyester fabric, at least in sections outside the first translucent area, or is not made of a polyester fabric at all.

[0051] Preferably, the articulated bus, in particular a double-articulated bus, has a bellows arrangement according to the invention.

[0052] Further advantageous embodiments and combinations of features of the invention emerge from the following detailed description and the entirety of the patent claims.

[0053] Short description of the drawings

[0054] The drawings used to explain the embodiment show:

[0055] Fig. 1 is an oblique view of a bellows arrangement according to the invention for

[0056] Articulated buses with one or more joints, in particular double-articulated buses, and

[0057] Fig. 2 is a representation of a cross-section running horizontally through the bellows arrangement in the view from top to bottom of the cross-section.

[0058] In principle, identical parts are provided with identical reference numerals in the figures. Ways of carrying out the invention

[0059] Figure 1 shows an oblique view of a bellows arrangement 1 according to the invention for articulated buses with one or more joints, in particular for double-articulated buses. The longitudinal direction of the bellows arrangement 1 in the illustration in Figure 1 runs from bottom left to top right. Bottom and top of the bellows arrangement 1 are also bottom and top in Figure 1, respectively.

[0060] The bellows assembly 1 comprises an inner bellows 2 with a substantially U-shaped cross-section and an outer bellows 3 with a substantially U-shaped cross-section, which outer bellows 3 surrounds the inner bellows 2. When the bellows assembly 1 is installed in an articulated bus or double-articulated bus, the bellows assembly 1 is arranged in the region of a joint between two consecutive vehicle parts of the articulated bus or double-articulated bus and generally surrounds a platform for passengers, protecting them from environmental influences. The bellows arrangement 1 is arranged as shown in Figure 1 in such a way that the substantially U-shaped cross section of the inner bellows 2 and the substantially U-shaped cross section of the outer bellows 3 are aligned as an inverted U and therefore with their three legs form vertical sides 22.1, 22.2, 32.1, 32.2 or side walls and a roof section 22 arranged therebetween.3, 32.3. The inner bellows 2 and the outer bellows 3 are arranged such that the outer bellows 3 encloses the inner bellows 2 along its three limbs, i.e., on the left vertical side 22.1, 32.1, the roof section 22.3, 32.3, and the right vertical side 22.2, 32.2. Together with the platform for passengers, which forms a floor, the bellows arrangement 1 thus forms a tube-like passage through which the two consecutive vehicle sections for the passengers of the articulated bus or double-articulated bus are continuously connected to one another.

[0061] When the bellows assembly 1 is in a straight position as shown in Figure 1, the outer bellows 3 is spaced from the inner bellows 2. In this straight position of the bellows assembly 1, the two consecutive vehicle parts between which the bellows assembly 1 is arranged are aligned along a same straight line, ie the two consecutive vehicle parts between which the bellows assembly 1 is arranged are not angled to each other or have an angle of 0° to each other.

[0062] Apart from the straight position, the bellows arrangement 1 enables the two consecutive vehicle parts, between which the bellows arrangement 1 is arranged, to be angled laterally up to an angle between the two consecutive vehicle parts of 30° or more. For this purpose, the bellows arrangement 1 in the straight position, i.e., with the consecutive vehicle parts arranged parallel, has a length of approximately 1.75 m measured in the longitudinal direction. However, this length can also be shorter or longer. For example, the length can be 1.5 m, 2 m, 3 m, or 4 m.

[0063] The inner bellows 2 has a first translucent region 21, and the outer bellows 3 has a second translucent region 31, wherein the first translucent region 21 and the second translucent region 31 are aligned with one another. In the wavelength range from 400 nm to 700 nm, the first translucent region 21 and the second translucent region 31 have at least four times the transmittance of the remaining regions of the respective bellows 2, 3. In one variant, the first translucent region 21 and the second translucent region 31 have at least four times the transmittance of the remaining regions of the respective bellows 2, 3 in the wavelength range from 280 nm to 800 nm.

[0064] This first translucent region 21 and the second translucent region 31 are located in the two vertical sides 22.1, 22.2, 32.1, 32.2 of the inner bellows 2 and the outer bellows 3. The first translucent region 21 and the second translucent region 31 extend between a first height and a second height, while the vertical sides 22.1, 22.2, 32.1, 32.2 of the inner bellows 2 and the outer bellows 3 are not translucent below the first height and above the second height and have a transmittance of less than 1% in the wavelength range from 400 nm to 700 nm. In a variant thereof, the vertical sides 22.1, 22.2, 32.1, 32.2 of the inner bellows 2 and the outer bellows 3 are not translucent below the first height and above the second height and have a transmittance of less than 1% in the wavelength range from 280 nm to 800 nm.

[0065] Strictly speaking, the translucent regions 21, 31 are dimensioned and positioned to correspond to the window arrangement in the adjacent vehicle parts between which the bellows arrangement 1 is arranged. As can be seen in Figure 1, the translucent regions 21, 31 of the inner bellows 21 and the outer bellows 31 overlap and are thus aligned with one another, so that light from outside the bellows arrangement 1 can pass directly through the two translucent regions 21, 31 into the interior of the bellows arrangement 1 inside the inner bellows 2.

[0066] In the present example, the roof section 22.3, 32.3 of the inner bellows 2 and the outer bellows 3 is not translucent. However, in variations, it is also possible for the roof section 22.3, 32.3 of the inner bellows 2 and the outer bellows 3 to have a translucent area or be completely translucent.

[0067] The outer bellows 3 is made of a silicone material reinforced with aramid fibers in the sections outside the second translucent area 31. The silicone material reinforced with aramid fibers is three-layered. It is a fabric made of aramid fibers coated with silicone on both sides. The inner bellows 2, on the other hand, is made of a single-layer polyester fabric in the sections outside the first translucent area 21. Furthermore, the first translucent area 21 and the second translucent area 31 are made of a two-layer polyester fabric and thus of a two-layer material.In variants thereof, the outer bellows 3 in the sections outside the second translucent region 31, the inner bellows 2 in the sections outside the first translucent region 21, as well as the first translucent region 21 and the second translucent region 31, can also be made of materials other than those mentioned above. Figure 2 shows a representation of a cross-section running horizontally through the bellows arrangement 1, viewed from top to bottom.

[0068] As can be seen in Figure 2, the inner bellows 2 and the outer bellows 3 are connected at a first end to a first common end profile 4 and at a second end to a second common end profile 5. In the illustration in Figure 1, of these two end profiles 4, 5, only the second common end profile 5, which faces away from the viewer, is shown. In Figure 1, only the upper edge of this second common end profile 5 can be seen. The first common end profile 4, which is arranged at the first end of the inner bellows 2 and the outer bellows 3 facing the viewer, is not shown in the illustration in Figure 1 so that it can be seen how the outer bellows 3 surrounds the inner bellows 3 and that there is a distance between the inner bellows 2 and the outer bellows 3.

[0069] As can be seen in both Figure 2 and Figure 1, the inner bellows 2 is composed of a first longitudinal section 2.1 and a second longitudinal section 2.2, and the outer bellows 3 is composed of a third longitudinal section 3.1 and a fourth longitudinal section 3.2. As can be seen in Figure 2, the first longitudinal section 2.1 and the third longitudinal section 3.1 are attached at one end to the first end profile 4 and at an opposite end to a central profile 6, while the second longitudinal section 2.2 and the fourth longitudinal section 3.2 are attached at one end to the second end profile 5 and at an opposite end to the central profile 6. The central profile 6, the outer bellows 3, and the end profiles 4, 5 are dimensioned such that the outer bellows 3 and the central profile 6 do not protrude beyond the end profiles 4, 5 in cross-section.

[0070] As can be seen in Figure 1, an LED light strip 7 is arranged on the central profile 6 as a lighting device, which extends in the interior of the bellows arrangement 1 in the interior of the inner bellows 2 along the central profile 6. This LED light strip extends essentially along the entire central profile 6, i.e. from the left vertical side 22.1 over the roof section 22.3 to the right vertical side 22.2. The invention is not limited to the exemplary embodiments explained in connection with the figures. Rather, further variants and embodiments falling within the scope of protection claimed in the claims will be immediately accessible to a person skilled in the art on the basis of the description. In summary, it can be stated that a bellows arrangement for an articulated bus, in particular a double-articulated bus, is provided, by means of which the passengers of the articulated bus orDouble-articulated bus with the bellows arrangement in the area of ​​the bellows arrangement the comfort is increased.

Claims

Patent claims 1. Bellows arrangement ( 1) for an articulated bus, in particular a double-articulated bus, comprising a) an inner bellows (2) having a substantially U-shaped cross-section and b) an outer bellows (3) having a substantially U-shaped cross-section, the outer bellows (3) surrounding the inner bellows (2).

2. Bellows arrangement (1) according to claim 1 , characterized in that the inner bellows (2) has a first translucent area (21) and that the outer bellows (3) has a second translucent area (31), wherein the first translucent area (21) and the second translucent area (31) are aligned with each other.

3. Bellows arrangement ( 1) according to claim 1 or 2, characterized in that in a straight position of the bellows arrangement ( 1) the outer bellows (3) is spaced apart from the inner bellows (2).

4. Bellows arrangement ( 1) according to one of claims 1 to 3, characterized in that the first translucent area (2 1) and the second translucent area (31) are located in both vertical sides (22.1, 22.2, 32.1, 32.2) of the inner bellows (2) and the outer bellows (3).

5. Bellows arrangement ( 1) according to claim 4, characterized in that the first translucent area (2 1) and the second translucent area (31) extend between a first height and a second height, while the vertical sides (22.1, 22.2, 32.1 , 32.2) of the inner bellows (2) and the outer bellows (3) are not translucent below the first height and above the second height.

6. Bellows arrangement ( 1) according to claim 4 or 5, characterized in that the roof section (22.3, 32.3) of the inner bellows (2) and the outer bellows (3) are not translucent.

7. Bellows arrangement ( 1) according to one of claims 1 to 6, characterized in that the inner bellows (2) and the outer bellows (3) are connected at a first end to a first common end profile (4) and at a second end to a second common end profile (5).

8. Bellows arrangement ( 1) according to claim 7, characterized in that the inner bellows (2) is composed of a first longitudinal section (2.1) and a second longitudinal section (2.2), that the outer bellows (3) is composed of a third longitudinal section (3.1) and a fourth longitudinal section (3.2), wherein the first longitudinal section (2.1) and the third longitudinal section (3.1) are attached at one end to the first end profile (4) and at an opposite end to a central profile (6), and wherein the second longitudinal section (2.2) and the fourth longitudinal section (3.2) are attached at one end to the second end profile (5) and at an opposite end to the central profile (6).

9. Bellows arrangement ( 1) according to claim 8, characterized in that a lighting device, in particular an LED light strip (7), is arranged on the central profile (6), which extends along the central profile (6), in particular in the interior of the bellows arrangement ( 1) inside the inner bellows (2).

10. Bellows arrangement ( 1) according to one of claims 1 to 9, characterized in that the outer bellows (3) is made of a silicone material reinforced with aramid fibers at least in sections outside the second translucent area (31). 1 1. Articulated bus, in particular double-articulated bus, with a bellows arrangement ( 1) according to one of claims 1 to 10.

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