EP1342434A2 - Hollow object used as a seat support - Google Patents

Abstract

The hollow article for use as a seat base comprises a seat area which consists of at least two sections distanced from one another by an intervening cutout or a depression. The sections are joined to one another by means of at least one bridging element.

Description

The present invention relates to a hollow body for use as a seat pad according to the preamble of claim 1. In particular, the present invention preferably relates to a hollow body with a specially designed seating area.

From the generic US 1468072 a hollow body is already known, which has a horseshoe shape and can be filled with a fluid.

Seat pads usually have a flat seat that is elastically deformed by the weight of a person. The seat pad adapts to the parts of the body that come into contact. Generally these are parts of the buttocks, parts of the thigh and the pelvic floor. The pressure resulting from the body weight is absorbed by the parts of the body lying on top and leads to compressions. A pressure load on the overlying parts of the buttocks and thighs is absorbed by their muscles, which can easily withstand this load permanently.

It looks different with diseases e.g. the prostate or even in the presence of hemorrhoids. Pressure loads in the area of the pelvic floor are passed on to the internal prostate and can lead to undesired additional irritation. Central pressure loads on the pelvic floor can also act on the hemorrhoids and also lead to unwanted irritation or pain.

The object of the present invention is therefore to provide a hollow body for use as a seat pad, which has a design which at least reduces the pressure loads acting on the pelvic floor, the pressure load being distributed and concentrated on parts of the body which can be subjected to higher loads. The seat pad should continue to provide a stable seat for people.

The present object is achieved by a hollow body for use as a seat pad according to claim 1.

The hollow body according to the invention has at least two partial areas intended for receiving the buttocks of the user, in which full support is achieved. Between the subareas, a surface or even a recess is formed which is lower than the height of the seat in the subareas and which avoids contact with the above-mentioned body parts to be protected, since it is lowered. There is a connecting bridge between the sub-areas, which ensures the cohesion of the sub-areas.

The beveling of the seating area in relation to the support area according to the invention enables a slightly beveled sitting posture that meets the needs and habits of the user. The hollow body or the parts forming the seating area advantageously taper in thickness or thickness starting from one end area to the other, preferably from the rear area in the direction of the front area. This also relieves the sensitive genital area of the user.

The connecting web can be of any design, preferably integrated in one piece with the partial areas. It can be adapted so that the overall result is a U-shaped, horseshoe-shaped, ring-shaped, tire-like structure and seating area. The two legs of the horseshoe or U-shape form the partial areas, while the curved center piece between the legs forms the connecting web. In the case of a tire shape, both the partial areas and the connecting web are curved.

The depression or recess is preferably open to the outside, since the corresponding body parts, e.g. Prostate also outside. This results in a basin-like recess or depression which is accessible from the outside or open to the outside.

The hollow body skin is preferably at least partially made of a thermoplastic, e.g. PE, HD-PE, ABS, PA, PVC, or PES, preferably treated with plasticizers and the usual additives.

The central axes of the partial areas preferably form an angle to one another, but can alternatively also be formed in parallel. The shape of the partial areas is flat and on the edge rounded or straight, but otherwise arbitrary. The divergence of the central axes of the partial areas results in an outwardly divergent arrangement of the partial areas, which supports sitting. In particular, there is also an outward enlarging depression or lowering or recess in the intermediate area between the partial areas.

The seating area of the hollow body is preferably U-shaped, horseshoe-shaped, ring-shaped or tire-shaped (with an interruption). The e.g. U-shaped seating area ensures that the pelvic floor of the user, who can come into contact with a seat pad in the middle, experiences little or no pressure. The legs of the seating area support the thighs of a seated person, while parts of the buttocks over a central recessed area (depression or recess) of the e.g. U-shaped seating area are arranged. The elasticity of the hollow body leads to an ergonomic adaptation of the seating area to the anatomy of the parts of the body lying on it.

The hollow body can adapt particularly advantageously to the anatomy of the body parts lying on the seating area. Furthermore, the hollow body in combination with the elastic properties can offer dynamic seating properties and at the same time reduce tension, pain and nerve irritation in the lumbar and spinal region and promote their healing.

Furthermore, the hollow body according to the invention is suitable for causing the user to perform dynamic compensatory movements of the spine, which increase well-being during long periods of sitting and effectively prevent fatigue.

Furthermore, the depression provided in the hollow body according to the invention can lie between the legs of the U-shaped or horseshoe-shaped or ring-shaped or tire-shaped seating area. This depression should be of sufficient depth to ensure a suitable and advantageous pressure relief of the pelvic floor.

Alternatively, the hollow body between the legs of the U-shaped seating area can have a recess instead of the recess. A recess provides a continuous depression at the height of the hollow body. If the depth of the depression or sufficient height of the hollow body, therefore, there is no pressure load on the areas of the pelvic floor free of seating areas. The desired relief is thus achieved regardless of the strength of the elastic deformation of the hollow body by the hollow body weight of the seated person. The depression or the recess is advantageously formed over the entire inner area which is encompassed by the seating area.

In a preferred embodiment, the hollow body has a support area for use as a seat pad, which e.g. is in contact with a seat surface of a chair arranged underneath. The support area is spaced apart from the seating area by a height. A front area of the seating area is given by the opening of the seating area, i.e. parts of the thighs are preferably in the front region. Correspondingly, parts of the buttocks lie in a rear area of the seating area.

The hollow body according to the present invention advantageously has an essentially wedge-shaped profile in a longitudinal section. This wedge-shaped profile is characterized by an essentially uniform tapering of the height of the hollow body. Alternatively, the seating area and the seating area can be constantly spaced, i.e. the two areas run essentially parallel on average.

In a further preferred embodiment, the outer outline of the hollow body shows a contour in the top view, which can be partially adapted to an essentially elliptical or circular boundary line. This means that the seating area of the hollow body can alternatively be described as an essentially elliptical or circular seating area which has a recess or recess such that an overall U-shaped or horseshoe-shaped seating area is formed.

The essentially elliptical or circular boundary line can advantageously have a diameter in the range from 30 cm to 50 cm.

The depression can furthermore advantageously essentially have a width in the range from 20 mm to 150 mm. Accordingly, an alternative recess can also advantageously have a width in the range of 20 mm to 150 mm.

The support area of the hollow body according to the invention, which is in contact with a base, for example a seat surface of a chair, can have a reinforcement of the support area in order to advantageously offer additional protection against damage to the support area or to stabilize the shape of the U-shape trained seating area. The reinforcement of the support area can be partially continuous in the area of a recess. A reinforcement in the region of the recess is advantageous in order to prevent the legs of the U-shaped seat region from straying apart. The striving apart of these legs can occur especially when using elastic materials which are loaded by the hollow body weight of the person sitting on them.

In a further preferred embodiment, the surface of the hollow body is designed to be non-slip in predetermined areas. Slip resistance is of particular interest in areas of the support area and in areas of the seating area, e.g. to rule out a potential risk of injury from slipping of the hollow body according to the invention. Slip resistance can e.g. through special surface materials or e.g. be ensured by structuring the surface.

Predetermined areas of the surface can also advantageously be provided with protruding shapes. These shapes can serve the above-mentioned slip resistance, but also have a shape-stabilizing effect and give the hollow body an appealing aesthetic design. The formations can, for example, have a substantially circular base area, advantageously with a diameter in the range from 0.01 cm to 1 cm, or, for example, have a lamellar structure, advantageously with a width in the range from 0.01 cm to 1 cm.

In a preferred embodiment, the seat pad designed as a hollow body is filled with fluid or solids. Air or a liquid such as water can preferably be used as the fluid. Furthermore, a viscous liquid such as a gel is conceivable as a fluid filling, which has a dampening effect on movements of the person sitting on the seat pad. An elastically deformable filling material can be used as the solid. Among other things, foams with different elastic characteristics are common.

The hollow body preferably receives the filling fluid, gel or the filling solid body in one or more internal chambers. These filling chambers can be closed off from one another or have defined passages. When the hollow body is filled with liquid, defined passages counteract movements of the liquid.

The filling chambers are furthermore preferably formed in the area of the partial areas and form them. As a result, a two-chamber or multi-chamber hollow body can be formed, the seating area of which is divided into sub-regions, each of which is formed by its own filling chamber.

In another embodiment, the connecting web is hollow, so that it forms an internal channel which is suitable for air or fluid exchange between the individual, likewise hollow areas of the hollow body. For this purpose, the hollow connecting web opens on both sides in the interior of the corresponding parts of the hollow body that it connects, namely the two filling chambers of the seating area.

In a further embodiment, the hollow connecting web is used in a hollow body with a plurality of filling chambers and preferably connects at least two of these chambers. As a result, air or fluid can be moved between the chambers when the hollow body is stressed, so that the degree of filling of the individual chambers can be changed as desired by the user.

The hollow body skin is advantageously formed from plastic, in particular the hollow body skin can contain plasticized polyvinyl chloride (PVC). The wall thickness of the hollow body skin preferably also has a thickness in the range from 1 mm to 8 mm.

In a preferred embodiment, the hollow body according to the invention has a support area spaced apart from the seating area. The peripheral edge areas of the seating area and the support area are connected by a transition area that extends continuously between the edge areas. The transition area is designed such that it supports the shape and shape of the U-shaped seat area in a stabilizing manner.

The cross-section of the transition region can preferably have an essentially semi-round or semi-elliptical cross section. Furthermore, the cross section of the transition region can have an overall cross section composed of a plurality of essentially semicircular or semi-elliptical cross sections.

• Fig. 1 a ist eine Aufsicht auf eine Ausführungsform des erfindungsgemäßen Hohlkörpers;
• Fig. 1b ist ein Querschnitt durch die Linie F-F von Fig. 1;
• Fig. 1c ist ein Querschnitt durch die Linie G-G von Fig. 1;
• Fig. 2a ist eine Aufsicht einer Ausführungsform des Hohlkörpers gemäß der vorliegenden Erfindung;
• Fig. 2b ist eine Schnittansicht entlang der Linie B-B in Fig. 2a einer erfindungsgemäßen Ausführungsform;
• Fig. 2c ist eine Schnittansicht entlang der Linie B-B in Fig. 2a einer weiteren erfindungsgemäßen Ausführungsform;
• Fig. 3 ist eine Aufsicht einer weiteren Ausführungsform des Hohlkörpers gemäß der vorliegenden Erfindung;
• Fig. 4a sind Schnittansichten entlang der Linien C'-C' und D'-D' in Fig. 3 einer erfindungsgemäßen Ausführungsform;
• Fig. 4b sind Schnittansichten entlang der Linien C'-C' und D'-D' in Fig. 3 einer weiteren erfindungsgemäßen Ausführungsform;
• Fig. 4c sind Schnittansichten entlang der Linien C'-C' und D'-D' in Fig. 3 einer weiteren erfindungsgemäßen Ausführungsform;
• Fig. 5a ist eine Schnittansicht entlang der Linie B'-B' in Fig. 3 einer erfindungsgemäßen Ausführungsform;
• Fig. 5b ist eine Schnittansicht entlang der Linie B'-B' in Fig. 3 einer weiteren erfindungsgemäßen Ausführungsform;
• Fig. 5c ist eine Schnittansicht entlang der Linie B'-B' in Fig. 3 einer weiteren erfindungsgemäßen Ausführungsform;

Further objects, advantages and features of the present invention will become apparent from the following exemplary description of preferred embodiments with reference to the accompanying drawings.

• Fig. 1 a is a plan view of an embodiment of the hollow body according to the invention;
• Fig. 1b is a cross section through line FF of Fig. 1;
• Fig. 1c is a cross section through the line GG of Fig. 1;
• 2a is a top view of an embodiment of the hollow body according to the present invention;
• FIG. 2b is a sectional view along line BB in FIG. 2a of an embodiment according to the invention;
• FIG. 2c is a sectional view along the line BB in FIG. 2a of a further embodiment according to the invention;
• 3 is a top view of another embodiment of the hollow body according to the present invention;
• 4a are sectional views along lines C'-C 'and D'-D' in Fig. 3 of an embodiment of the invention;
• 4b are sectional views along lines C'-C 'and D'-D' in FIG. 3 of a further embodiment according to the invention;
• 4c are sectional views along lines C'-C 'and D'-D' in FIG. 3 of a further embodiment according to the invention;
• Fig. 5a is a sectional view taken along line B'-B 'in Fig. 3 of an embodiment of the invention;
• Fig. 5b is a sectional view taken along line B'-B 'in Fig. 3 of another embodiment of the invention;
• Fig. 5c is a sectional view taken along line B'-B 'in Fig. 3 of another embodiment of the invention;

Identical or similar elements of the figures are referred to using the same reference symbols.

1 shows a hollow body according to the invention with two spaced-apart sections forming the seating area, which are connected to one another at the ends by a hollow connecting web. The central axes of the partial regions have a length of approximately 20 to approximately 40 cm, a region of approximately 20-30 cm being preferred. The transverse axes of the partial areas have a dimension of approximately 10-25 cm, preferably approximately 13-20 cm.
The connecting web is approximately 3-10 cm long, preferably approximately 5-7 cm long, while its width dimension increases from approximately 1 cm to approximately 8 cm due to the diverging partial regions, preferably from approximately 1 cm to approximately 7 cm.

The two partial areas shown are formed by two filling chambers, which are connected by the hollow connecting web and are thereby in exchange, so that air or fluid can flow from one chamber into the other chamber. As a result, the filling strength of the chambers can be adjusted by the user.

The central axes of the partial areas form an acute angle of approximately 1 to 15 ° with respect to one another and thereby create a divergent arrangement of the partial areas.

As shown in FIG. 1b, the cross section of the hollow body tapers, so that the seating area and the seating area are spaced obliquely apart.

As shown in FIG. 1c, the connecting web does not take up the full height of the hollow body, but is recessed or tapered in relation to the hollow body parts forming the partial regions.

2a is a top view of an embodiment of the hollow body according to the present invention. The hollow body 10 shown in a top view in FIG. 2a has an essentially rectangular outline shape. The seating area 11 is shown in the top view. In order to obtain a U-shaped overall shape of the hollow body 10, the recess 12 is machined into the hollow body. The hollow body 10 or the seat area 11 is mirror-symmetrical to the axis A or to a plane which is perpendicular to the seat area and which contains the axis A. On the seating area 11 are in this embodiment circular formations 13, 14 and 15 arranged. The circular shapes 13, 14 and 15 are preferably identical shapes which serve both the aesthetic shape and the slip resistance of the hollow body and, for example, and a certain massage function.

The elasticity of the hollow body 10 ensures that the seating area 11 adapts to the anatomy of the hollow body parts in contact when subjected to a person. The hollow body 10 is advantageously designed as a hollow body, the hollow body skin of which is preferably made of plastic, in particular of plasticized polyvinyl chloride (PVC). When such a hollow body is filled with air, a hollow body with the elastic properties described is obtained. Furthermore, the adjustment of the air pressure in the interior of the hollow body can be used to control the external shape and to adapt the degree of deformation in response to external pressures to the requirements.

Fig. 2b is a sectional view along the line B-B in Fig. 2a of an embodiment according to the invention. The sectional view is chosen parallel to the axis of symmetry A in order to represent an essentially rectangular configuration along the sectional views parallel to the line of symmetry A.

In the illustrated longitudinal section, a section through the seat area 11, the support area 25 and the transition area 26 can be seen. The transition area connects the edge areas of the seat area and the support area of the hollow body all around. The essentially rectangular design of the sectional view and thus also of the lateral profile show a constant spacing of the seat area from the support area, that is to say that the seat area and the support area are aligned essentially parallel to one another.

Advantageously, the hollow body shown in FIG. 2b can be composed of two components, a first component which has the seating region and part of the transition region, and a second component which has the support region and a further part of the transition region. In the event that the two components are made of plastic, the two components can be welded together, for example.

The inner region 22 of the hollow body is preferably filled with a fluid, e.g. Air or water. The support area is also advantageously designed to be non-slip. For this purpose, a structuring 27 of the support area 25 as shown in FIG. 2b can be used. The structuring 27 can have a lamella structure.

In a modified embodiment, the design of the transition region 26 can have a single or multi-beaded, semi-elliptical, semi-circular or similar shape instead of the wall-shaped shape.

FIG. 2c is a sectional view along the line B-B in FIG. 2a of a further embodiment according to the invention. The sectional view is chosen parallel to the axis of symmetry A in order to represent the advantageous wedge-shaped configuration along sectional views parallel to the line of symmetry A.

In the illustrated longitudinal section, a section through the seat area 11 and an example of a shape 13 can be seen. Sections through the support area 20 and the peripheral area 21 are also shown. The inner region 22 is preferably air-filled. Comparable elastic properties can alternatively be achieved with a foam-like hollow body filling. When the hollow body is filled with a liquid, elastic properties of the hollow body can be obtained by appropriate choice of material for the hollow body skin, since liquids themselves have no elastic properties.

The longitudinal section shown shows a wedge-shaped profile. This profile is obtained in each section parallel to the axis of symmetry A shown in FIG. 1. Correspondingly, this profile is also shown in a side view of the hollow body 10. The wedge-shaped profile of the hollow body 10 shown in longitudinal section shows a profile tapering towards the front, so that in this edge area the seating area merges directly into the support area. In a modified embodiment, a bead-shaped or wall-shaped transition area can connect the seat area and the support area in the front area.

3 is a top view of another embodiment of the hollow body according to the present invention. The embodiment shown here shows an essentially elliptical outline 35 of the hollow body in a top view. The outline 35 is for illustrated representation in a dashed style in Fig. 3 can be seen. The seating area of the hollow body 30 is U-shaped and the seating area 31 is again shown accordingly in the top view. The U-shaped seat area 31 and a hollow body 30 with an essentially elliptical outline 35 are mirror-symmetrical to the axis A '. The inner region 32, which is partially encompassed by the U-shaped seat region 31, shows a recess with a continuous floor reinforcement 32. Alternatively, instead of the recess, a recess can be worked into the hollow body 30 at this point. The floor reinforcement shown here protects the support surface, can have a special anti-slip coating on the support side and stabilizes the legs of the U-shaped seating area against lateral deformation movement.

The diameter Ø _{s of} the hollow body 30 is preferably in a range from 30 cm to 40 cm. The width B _{A of} the recess or depression is advantageously in a range from 20 mm to 150 mm. Correspondingly, these sizes result in an essentially mean width B _{DI of} the legs of the U-shaped seat area of 75 mm to 175 mm. The depth B _{H of} the base region of the U-shaped seat region also advantageously has a depth in a range from 70 mm to 80 mm.

In order to fill the hollow body 30 designed as a hollow body with fluids, a corresponding inlet 33 is advantageously worked into the hollow body skin. This inlet 33 can be a valve. The valve can be used for single or multiple use. When used once, the hollow body is filled once during its manufacture with a predetermined amount or with a predetermined volume of fluid and the inlet 33 is irreversibly closed. An inlet 33 prepared for repeated use enables an owner to individually adapt the filling quantity or the filling volume, for example to his weight, in order to obtain optimal properties of the hollow body 30.

4a, 4b and 4c show sectional views along the lines C'-C 'and D'-D' in FIG. 3 of various embodiments according to the invention.

4a shows the cross sections of a first embodiment along the section lines C'-C 'and D'-D' of an essentially elliptical tubular body 30 shown. The cross sections 45 are reduced compared to the cross sections 46 in accordance with the tapering side view and the tapering legs in FIG. 3 of the U-shaped seat area. The transition from the seating area 31 into the lateral transition area and the support area is continuous. According to the reinforcement 32 shown drawn in in FIG. 3, this is not shown continuously in the section C '. The hollow body 30 shown in FIG. 4a is preferably a hollow body which has two filling chambers 40 and 41.

4b shows the cross sections of a further embodiment along the section lines C'-C "and D'-D 'of an essentially flattened, elliptical, tubular body 30. The cross sections 55 are in relation to the cross sections 56 corresponding to the tapering side view and 3 of the tapered leg of the U-shaped seat area, the transition from the seat area 31 into the lateral transition area and the support area is continuous, and according to the reinforcement 32 shown in FIG 4a is preferably a hollow body which has a filling chamber 50.

4c shows the cross sections of a further embodiment along the section lines C'-C 'and D'-D' of a substantially rectangular hollow body 30 with a multi-bulge transition area 67. The cross sections 65 are smaller than the cross sections 66 in accordance with the tapering side view and the tapering legs in FIG. 3 of the U-shaped seat area. The cross sections have the seat area 31, the lateral transition area 67 and a support area 68, which are shown by way of example only as a cross section 66. According to the reinforcement 32 shown drawn in in FIG. 3, this is not shown continuously in the section C '. The reinforcement 32 merges continuously into the support area 68, but can also additionally reinforce the support area 68 (not shown). The hollow body 30 shown in FIG. 4a is preferably a hollow body which has a filling chamber 60.

5a, 5b and 5c show sectional views along the line B'-B 'in FIG. 3 of various embodiments according to the invention.

The sectional view in FIG. 5 a represents a longitudinal section through an embodiment of the hollow body 30, of which cross sections are shown in FIG. 4 a. Accordingly, reference symbols from FIGS. 3 and 4a are used in the following description. The longitudinal section shows the seat area 31, the support area 48 and the transition area 47 of the hollow body 30. The two air chambers 40 and 41 internally divide the hollow body 30 designed as a hollow body. The hollow body 30 tapers in the direction of the opening of the U-shaped seat area.

The sectional view in FIG. 5 b represents a longitudinal section through an embodiment of the hollow body 30, of which cross sections are shown in FIG. 4 b. Correspondingly, reference symbols from FIGS. 3 and 4b are used in the following description. The longitudinal section shows the seat area 31, the support area 58 and the transition area 57 of the hollow body 30. The hollow body 30, which is designed as a hollow body, has a filling chamber 50. The hollow body 30 tapers in the direction of the opening of the U-shaped seat area. The seat area 31 and the support area 58 additionally have formations 71, 72 and 73 or formations 74, 75 and 76. The formations are advantageously identical.

The sectional view in FIG. 5c represents a longitudinal section through an embodiment of the hollow body 30, of which cross sections are shown in FIG. 4c. Correspondingly, reference symbols from FIGS. 3 and 4c are used in the following description. The longitudinal section shows the seat area 31, the support area 68 and the transition area 67 of the hollow body 30. The hollow body 30, which is designed as a hollow body, has a filling chamber 60. The hollow body 30 tapers in the direction of the opening of the U-shaped seat area.

The hollow body is preferably characterized in that the hollow body has a recess which is at least partially encompassed by the U-shaped or horseshoe-shaped seating area.

The hollow body is preferably characterized in that the hollow body has a recess which is at least partially encompassed by the U-shaped or horseshoe-shaped seating area.

The hollow body is preferably characterized in that the depression or recess located between the partial areas is delimited by the partial areas and the connecting web.

The hollow body preferably has a support area which is arranged at a constant constant distance from the seat area.

The hollow body is preferably characterized in that the outer contour of the hollow body has at least partially an essentially elliptical or circular segment shape in cross section.

The hollow body is preferably characterized in that the outline of the hollow body has a diameter in the range from 30 cm to 50 cm.

The hollow body is preferably characterized in that the depression has a width in the range from 20 mm to 150 mm.

The hollow body is preferably characterized in that the recess has a width in the range from 20 mm to 150 mm.

The hollow body is preferably designed such that the support area has a floor reinforcement.

The hollow body is preferably characterized in that the floor reinforcement is carried out in the region of the recess.

The hollow body is preferably characterized in that the surface of the hollow body has a non-slip surface finish in predetermined areas of the seating area.

The hollow body is preferably characterized in that the surface of the hollow body has protruding formations in predetermined areas.

The hollow body is preferably characterized in that the formations have a dimension in a range from 0.01 cm to 1 cm.

The hollow body is preferably characterized in that the hollow body is filled with fluid.

The hollow body is preferably characterized in that the hollow body is filled with air.

The hollow body is preferably characterized in that the hollow body has at least one filling chamber.

The hollow body is preferably characterized in that the wall thickness of a hollow body skin of the hollow body is in a range from 1 mm to 8 mm.

The hollow body is preferably characterized in that the transition region has an essentially rounded or semi-elliptical cross section in cross section.

The hollow body is preferably characterized in that the transitional area in cross section is composed of several substantially rounded or semi-elliptical individual cross sections.

Claims (10)

Hollow body for use as a seat pad, the hollow body having a seating area, the seating area having at least two spaced-apart partial areas, at least one continuous flat recess or recess being formed between the partial areas, and the partial areas being formed by at least one connecting web extending between the partial areas are connected to one another, the hollow body having a support area arranged at a distance from the seat area, characterized in that the seat area and the support area are bevelled relative to one another, and that the partial areas forming the seat area are formed by filling chambers. Hollow body according to claim 1, characterized in that the connecting web and the partial areas are integrally and integrally formed. Hollow body according to claim 1 or 2, characterized in that the recess or depression formed is open to the outside. Hollow body according to claim 1, 2 or 3, characterized in that the hollow body has a geometry which is selected from the group: U-shaped, horseshoe-shaped, ring-shaped (with interruption) and that the seating area reacts elastically to a load on the seating area. Hollow body according to one of the preceding claims, characterized in that the hollow body is at least partially made of thermoplastic. Hollow body according to one of the preceding claims, characterized in that the partial areas each have a central axis and the central axes form an acute angle to one another. Hollow body according to one of the preceding claims, characterized in that it has a substantially wedge-shaped shape in longitudinal section. Hollow body according to one of the preceding claims, characterized in that the connecting web is hollow and is connected to the filling chambers. Hollow body according to claim 5, characterized in that the thermoplastic is plasticized polyvinyl chloride (PVC). Hollow body according to one of the preceding claims, wherein the hollow body between the seat area and the spaced support area has a transition area which extends between peripheral edge areas of the support area and the seat area and connects them.

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