EP1391571A1 - Elongated roller-type shutter profile made of plastic or metal for swimming pool covers - Google Patents

Abstract

The shutter profile (1) has a sealing body (13a, 13b) made of an elastic material, which based on a mounting state in which the sealing body is inserted into a hollow chamber (3a, 3b). The sealing body is brought into a sealing state by clamping between piston plate (12a, 12b) and a cap (11) in which the sealing body is expanded in a direction perpendicular to a longitudinal direction (2) of the chamber.

Description

The invention relates to an elongated roller shutter profile made of plastic or metal for Swimming pool covers, with at least one watertight closure, with the least a hollow chamber extending in the longitudinal direction of the roller shutter profile on one Front side of the roller shutter profile is closable, the closure being a cap that is provided by the Front side can be at least partially stirred into the hollow chamber, one at a distance from the Has cap arranged within the respective hollow chamber and a piston plate itself has sealing means extending between the cap and the piston plate.

Such a roller shutter profile is, for example, from EP 0 225 862 A1 and EP 0 732 469 A 1 known. The known roller shutter profiles are extruded in particular Plastic profiles used for swimming pool covers. Because the swimming pool covers lie on the water surface and due to the air-filled hollow chambers surface of the water, it is important to keep the roller shutter profiles at their ends complete waterproof. Due to the use of such roller shutter profiles outdoors particular care must be taken that both the material of the roller shutter profile itself, however also the materials of the closure are weatherproof, i.e. especially resistant to UV radiation as well as major temperature fluctuations. Under no circumstances may the materials become brittle during the lifespan of such covers or as a result of Discard temperature fluctuations, which in turn could lead to leaks.

In the roller shutter profiles known from EP 0 225 862 A1 and EP 0 732 469 A1 the piston plates are each connected to the cap via a piston rod-like shaft. The cap has a stopper section that corresponds to the cross section of the respective hollow chamber adapted and introduced into this. The cross section of the piston plate is also adapted to the cross section of the hollow chamber. The tightness is made in that in each case the one located between the piston plate and the plug section Intermediate space completely filled with a flowable sealant which is through an opening in the plug portion of the cap from the outside by means of a suitable filling device is introduced. The one based on a plastic material On the one hand, sealant has certain adhesive properties that ensure a permanent connection cause the same with the walls of the hollow chamber, and on the other hand hardens after one certain time. In this way, a permanent, non-releasable closure of the roller shutter profile can be achieved. While in the known from EP 0 225 862 A1 Roller shutter profiles of each hollow chamber have their own feed opening and one next to it assigned ventilation or overflow opening, which consists of EP 0 732 469 A known development in that neighboring hollow chambers by way of a known further development in that neighboring hollow chambers in the way of a single Filling process can be closed. For this purpose, the liquid sealant first flows through a feed opening into the first hollow chamber, and then through an overflow channel in the cap into the adjacent hollow chamber and from there into any neighboring ones Penetrate hollow chambers. In the last such hollow chamber connected in series there is a vent or overflow opening in the associated plug section the cap, so that the filling process can then be ended when it comes out of this Sealant opening emerges.

Even if there is a reduction with the further development described in EP 0 732 469 B1 of working hours in the manufacture of such waterproof closures could, is the use of such flowable and curing sealants in general problematic. For example, one disadvantage is that the closures are not immediate can be mechanically loaded after filling with the sealant, because it only reaches the necessary hardness after a certain time, i.e. a possible impact of the crane can resist. In addition, the filling of the sealant in the space between piston plate and sealing cap only with a certain delivery rate take place, so that in practice a time requirement per hollow chamber to be filled by several Seconds arises. Another disadvantage is that the filling process is interrupted cause the sealant to harden in the filling device, so that time-consuming cleaning work is required before resuming filling are.

The invention has for its object a closure for a roller shutter profile To further develop swimming pool covers so that, on the one hand, the time spent at the Production of the tight seal is reduced and, on the other hand, if possible, a resettability the sealing is made possible.

Starting from the roller shutter profile of the type described in the introduction, this object is achieved according to the invention solved in that the sealant is a sealing body made of an elastic and / or plastic material, which is based on an assembly state in which it is insertable into the hollow chamber, by clamping between the piston plate and the Cap can be converted into a sealing state in which it is in the direction perpendicular to the longitudinal direction the hollow chamber is extended so that it is circumferentially close to the hollow chamber bounding walls.

The closure according to the invention thus initially differs from the prior art Technology that no longer a flowable sealant is used, but a sealing body, which has elastic and / or plastic properties, but basically without external force is essentially dimensionally stable. The sealing effect against the Walls of the hollow chamber is achieved according to the invention in that the sealing body pressure is exerted on both sides in the direction of the longitudinal direction of the hollow chamber, so that a deformation occurs as a result, which increases the dimensions of the sealing body in the direction perpendicular to the longitudinal direction of the hollow chamber. This Expansion of the roller shutter profile causes it to circulate around the walls the hollow chamber so that the desired sealing effect occurs.

It is therefore advantageously no longer necessary to use a sealant, its properties after filling in the between the piston plate and the cap located space changed in such a way that it is initially flowable changes in sufficiently firm. A chemical or whatever material change after the shutter profile is equipped with the closure according to the invention Teaching is no longer necessary. Aging problems, such as those associated with one long storage of the liquid sealant according to the prior art under certain circumstances can occur are therefore not to be feared according to the invention. The invention also allows when using suitable materials, a reversibility of the closure in the Meaning that after lifting the tension of the sealing body between the piston plate and the cap as a result of a reshaping of the sealing body enters from the walls of the roller shutter profile, so that the closure as a whole again can be removed. When using a look essentially exclusively plastic deforming sealing body, which may still be in connection with the hollow chamber walls Has adhesive properties is the property of reversibility of course not given, since a reshaping and detachment of the sealing body from the walls in this case can hardly be achieved.

Basically, it is conceivable that the piston plate on a projection on the walls the hollow chamber rests, a further displacement of the same into the interior of the hollow chamber prevented, and thereby tension between the piston plate and the cap is achieved that the cap also snaps into place, for example, behind a projection. The The distance between the piston plate and cap in this sealing state of the closure is so dimension that the resulting shortening of the sealing body in the axial direction a sufficient radial expansion of the same causes an abutment on the walls to achieve with sufficient preload.

According to a particularly preferred embodiment of the invention, it is provided that a Connection element is present, which extends between the cap and the piston plate and at least when the sealing body is brought into the sealing state under tensile stress stands. In this case, there is support for both the piston plate and the cap not required on the walls of the roller shutter profile, which is particularly the case with extruded materials Profiles is advantageous because such projections, i.e. Abutment, not easily are generating. It may be sufficient to apply the tension to the connecting element, i.e. the compressive stress on the sealing body only once or for a certain one Generate period, namely when the sealing body made of a plastic material exists that develops a strong adhesive force in connection with the walls of the hollow chamber. In this case, even after the tension on the connecting element has been released, i.e. a pressure relief of the sealing body, due to the weak or not pronounced elastic properties are not expected with a reshaping of the sealing body so that the all-round adherence to the walls without any further The force acting on the sealing body is retained.

In the case of roller shutter profiles with several hollow chambers running parallel to each other each separated by a partition wall running in the longitudinal direction of the roller shutter profile are separated, the sealing process must be done in a particularly efficient manner if the closure has a cap that can be inserted into several hollow chambers simultaneously and the number of sealing bodies corresponding to the number of hollow chambers and piston plates is assigned.

According to a further embodiment of the roller shutter profile according to the invention, this penetrates Connecting element the sealing body and the cap and is in the longitudinal direction of the hollow chamber movable relative to the sealing body and the cap. Penetration of the sealing body enables a reliable seal on its circumference, i.e. especially an immediate one Contact of the elastic or plastic material of the sealing body with the surrounding one Chamber walls.

A further development of the invention also consists in that the connecting element is a Is screw whose thread interacts with the piston plate. Preferably penetrates the screw also the cap and is supported on the outside with its screw head. In the piston plate can, for example, by way of their injection molding manufacture a metallic nut will be molded in with the machine thread of the screw interacts. Alternatively, it is also possible to simply insert a blind hole in the Form the piston plate into which a screw with a self-tapping thread is screwed becomes.

An alternative embodiment of the roller shutter profile according to the invention is that the rod-shaped connecting element is integrally connected to the piston plate and on its surface is provided with barbs that interact with a pawl, which is arranged in the cap. This works according to the principle of cable ties The type of connection between the piston plate and cap becomes the process of generation the preload on the sealing body is greatly simplified. A free and protruding from the cap The end of the connecting element only has to be applied with a defined force in the direction be pulled out of the hollow chamber. The preload on the sealing body remains after releasing the external traction through the locking function of the barbs preserved permanently. A reversible removal of the sealing effect is with this closure principle however not possible. Basically, however, is an unlocking option for the Pawl conceivable.

A further development of the roller shutter profile according to the invention is that the Piston plate and / or the cap on its end face contact surface facing the sealing body raised conically and the sealing body itself on at least one of its two opposite corresponding with the contact surfaces of the piston plate and / or the cap end contact surfaces are recessed complementary conical. The interaction the conical surface with the complementary conical surface leads to the axial bracing of the cap and sealing body or of the piston plate and sealing body for an improved implementation of the axial tension in a radially directed expansion of the sealing body. The complementary conical / conical contact surfaces can either attached to the sealing body and the adjacent component only on one side be or on both sides of the sealing body.

In addition, it is also possible to seal the sealing body with a closed ring and to provide a cavity filled with gas from the outside. With an axial Pressing the sealing body between the piston plate and the cap carries out the compression of the cavity due to its tightness to a radial expansion of the same. In Connection with the reduced wall thickness of the sealing body in the area between the Cavity and the wall of the hollow chamber of the roller shutter profile is an improved nestling of the outer jacket of the sealing body to the inner jacket of the hollow chamber.

Finally, it is also within the scope of the present invention to have a closure for watertightness Closing an elongated roller shutter profile made of plastic or metal to provide, the closure has the features and characteristics described above having. Such closures can be used, for example, as spare parts for Use existing roller shutter profiles or sell them as independently tradable goods.

Figur 1:

eine Draufsicht auf einen Verschluss eines abschnittsweise dargestellten geschnittenen Rolladenprofils;

Figur 2:

eine Seitenansicht des Verschlusses gemäß Figur 1;

Figur 3:

eine Rückansicht des Verschlusses nach Figur 1;

Figur 4:

eine Vorderansicht des Verschlusses nach Figur 1;

Figur 5:

einen alternativen Verschluss mit Verbindungselementen in Form von Maschinenschrauben;

Figur 6:

einen weiteren alternativen Verschluss mit Verbindungselementen in Form von Schrauben mit selbstschneidenden Gewinden;

Figur 7:

einen weiteren alternativen Verschluss mit kegel-/konusförmige Kontaktflächen zwischen Dichtkörper und Kolbenplatte sowie Dichtkörper und Kappe und

Figur 8:

einen weiteren alternativen Verschluss mit einem Dichtkörper mit einem ringförmigen Hohlraum.

The closure of a roller shutter profile according to the invention is explained in more detail below with reference to several exemplary embodiments which are shown in the drawing: It shows:

Figure 1:

a plan view of a closure of a cut roller shutter section shown in sections;

Figure 2:

a side view of the closure of Figure 1;

Figure 3:

a rear view of the closure of Figure 1;

Figure 4:

a front view of the closure of Figure 1;

Figure 5:

an alternative closure with fasteners in the form of machine screws;

Figure 6:

another alternative closure with fasteners in the form of screws with self-tapping threads;

Figure 7:

another alternative closure with conical / conical contact surfaces between the sealing body and piston plate and sealing body and cap and

Figure 8:

another alternative closure with a sealing body with an annular cavity.

A roller shutter profile shown in sections in FIGS. 1 to 4 in a longitudinal section 1, consists of a thermoplastic material (for example PVC) and is in Made of extrusion. The roller shutter profile 1 has two in the longitudinal direction 2 extending hollow chambers 3a and 3b, the two longitudinal walls 4 and 5 and one partition 6 extending between the hollow chambers 3a and 3b. In connection on the longitudinal wall 5 there is another chamber 7 which is open on its longitudinal side, engages in a web-shaped hook strip 8 of an adjacent roller shutter profile, whereby an articulated connection between two or a plurality of roller shutter profiles 1 is established becomes. In this way, a large number of parallel, extruded profile pieces a roller shutter curtain, for example for a windable and unwound Swimming pool cover, formed.

From an end face 9 of the roller shutter profile 1, the latter is closed by means of a closure 10 waterproof sealed. The closure 10 consists of a cap 11, two piston plates 12a and 12b, two sealing bodies 13a and 13b and two connecting elements 14a and 14b. The cap 11 has a plate 15, a rounded one projecting at right angles therefrom Slide bar 16 and two plug sections 17a and 17b, which, like the piston plates 12a and 12b and the sealing bodies 13a and 13b on the cross section of the hollow chambers 3a and 3b are adjusted. The plug sections 17a and 17b penetrate with their entire length into the hollow chambers 3a and 3b, whereas the plate 15 is located on the end faces of the roller shutter profile 1 supports.

The connecting elements 14a and 14b are in one piece with the respective piston plates 12a and 12b and are made of nylon. The top of the flexible rod-shaped fasteners 14a and 14b are provided with barbs 18. It is also possible that the connecting elements are provided on both sides with barbs 18 of this type. The connecting elements 14a and 14b do not penetrate the sealing bodies 13a and 13b in FIG breakthroughs shown in their cross section to the cross section of the connecting elements 14a and 14b are adapted. These connecting elements penetrate in the same way 14a and 14b also the cap 11 in the area of the plug sections 17a and 17b and the Plate 15 in adapted openings 19a and 19b (see Fig. 3). Are inside the plate 15 themselves on the top of the openings 19a and 19b pawls 20a and 20b with the barb 18, the connectors 14a and 14b cooperate and move prevent it in the direction of arrow 21.

The sealing bodies 13a and 13b consist of a rubber-elastic plastic material a low hardness. The material is UV-resistant and temperature-resistant up to at least 100 ° C, as a result of solar radiation on the upper and lower walls 22 and 23 of the roller shutter profile 1 not inconsiderable temperatures occur in the area of the closure 10 can. The materials used are, for example, silicone elastomers, fluoroelastomers, fluorosilicone elastomers or blend elastomers made from the rubbers of the aforementioned elastomers or polyurethanes in question.

1 and 2, the closure 10 is shown in its assembled state. The cross section the sealing body 13a and 13b free from external forces is the cross section of FIG Hollow chambers 3a and 3b adapted so that the pre-assembled closure 10 with its all individual parts, as shown in FIGS. 1 and 2, from the front end of the roller shutter profile 1, can be inserted into this. The transfer of the closure 10 or the sealing body 13a and 13b in the sealing state, not shown in the drawing, is done in a simple manner Way in which the connecting elements 14a and 14b against the direction of the arrow 21 which are pulled out of the hollow chambers 3a and 3b, with the cap 11 in its contact position is held on the end face 9 of the roller shutter profile 1. As a result of pulling out of the connecting elements 14a and 14b, the piston plates 12a and 12b pushed against the sealing body 13a and 13b and then these two components together against the plug sections 17a and 17b of the cap 11. The tensile force on the connecting elements 14a and 14b after reducing the spaces 24a and 24b and 25a and 25b further increased to zero, there is an elastic or depending on the selected material of the sealing body 13a and 13b also for a plastic deformation of the same. Due to the pressure exerted in the longitudinal direction 2 of the hollow chambers 3a and 3b, which the sealing bodies 13a and 13b are perpendicular to, so that in succession the cross-sectional enlargement of the sealing body 13a and 13b, a circumferentially tight system the same on the longitudinal walls 4 and 5, the partition 6 and the upper and lower Wall 22 and 23 of the roller shutter profile 1 takes place. Due to the tension in the connecting elements 14a and 14b generated compressive stress on the sealing body 13a and 13b, there is also a circumferentially dense contact between the facing ones flat end faces, the piston plates 12a and 12b and the sealing body 13a and 13b as well as the latter and the plug sections 17a and 17b of the cap 11 this prevents liquid from flowing along the connectors 14a and 14b through the openings 19a and 19b in the plug sections 17a and 17b and through the Breakthroughs in the sealing bodies 13a and 13b into the interior of the hollow chambers 3a and 3b can penetrate.

The closure 10 'shown in Fig. 5 differs from that shown in Figs. 1 to 4 only in that the connecting elements 14a 'and 14b' as machine screws are made of stainless steel with a Phillips countersunk head 26. The Ends of the connecting elements 14a 'and 14b' facing away from the cap 11 'act with nuts 27a and 27b, also made of stainless steel, together. These nuts 27a and 27b are overmolded in the injection molding of the piston plates 12a 'and 12b'. The shortening of the distance between the piston plates 12a 'and 12b', the Sealing body 13a 'and 13b' and the plug sections 17a 'and 17b' of the cap 11 ' by turning the screws. The result of the compression of the sealing body 13a 'and 13b' radial expansion has taken place and the sealing achieved with this is by appropriate The screws can be unscrewed again. So are the hollow chambers with such Closures 10 'closed profiles accessible again at any time without the seal destroyed and would then have to be produced again with replacement materials.

A further alternative closure 10 ″ is shown in FIG. 6, in which the connecting elements 14a "and 14b" designed as screws with a self-tapping thread are. The ends of the connecting elements 14a "and 14b" facing away from the cap 11 " engage in blind bores 28a and 28b in the piston plates 12a "and 12b". The diameter the blind bores 28a and 28b formed by injection molding are smaller than that Diameter of the screws. While the connection element 14a "the thread The shaft of the connecting element extends over the entire shaft length of the screw 14b "divided into a front part with thread and a rear part without such. The piston plate 12b "has a contact part 29b facing the sealing body 13b", the cross section of which is adapted to the cross section of the hollow chamber 3b, and a rear one Pin part 30b, the cross section of which is reduced.

The assembly of the connecting elements 14a 'and 14b', 14a "and 14b ", preferably takes place with the aid of torque-controlled tightening tools in order to to generate defined axial prestress on the sealing bodies 13a 'and 13b', 13a "and 13b". The closure 10 according to FIGS. 1 to 4 is preferably assembled by means of a plier-like tool that initially biases the rod-shaped Connecting elements 14a and 14b generated and when a certain tensile force is reached - analogous to the way a blind rivet tool works - a cut or a notch and Tear off the protruding end of the connecting elements 14a and 14b. This can also be provided with a predetermined breaking point at the corresponding position responds when a certain tension is reached.

Fig. 7 shows a closure 30 in which the sealing body penetrated by a screw 33 has a shape that on both opposite end faces 35 'and 35 "is provided with a conical depression. Both the piston plate 32 as well as the cap 31 have conical shapes in the area of the contact surfaces 35 'and 35 " Elevations that are complementary to the depressions in the sealing body 33. The at Axial pressing of sliding surfaces sliding on one another results in a particularly favorable one Conversion of the axial preload into a radial expansion of the sealing body 33.

8 finally shows yet another embodiment of a closure 40 in which the piston plate 42 and the cap 41 and also the substantially cylindrical and with a central through bore for the screw provided sealing body 43 each flat face-side contact surfaces 45 'and 45 "is provided. In distinction to the previously 8, the sealing body 43 according to FIG. 8 has an annular shape closed and closed to the outside cavity 46. This has the Shape of a torus with an oval cross-section. The wall thickness of the sealing body 43 in the area between the hollow body 46 and the wall of the roller shutter profile is smaller than the wall between the cavity 46 and the through hole for the screw. The comparatively thin outer wall results in a high flexibility in the sealing area, so that there a reliable system, i.e. also sealing, can be achieved. The works pressurized cavity 46 like a gas spring, which is permanent maintenance the sealing effect guaranteed.

Claims (10)

Elongated roller shutter profile (1, 1 ") made of plastic or metal for swimming pool covers, with at least one watertight closure (10, 10 ', 10", 30, 40) with which at least one in the longitudinal direction (2) of the roller shutter profile (1, 1 ") extending hollow chamber (3a and 3b) on an end face (9) of the roller shutter profile (1, 1") can be closed, the closure (10, 10 ', 10 ", 30, 40) a cap (11, 11', 11 ", 31, 41), which can be inserted at least partially into the hollow chamber (3a and 3b) from the end face (9), and one at a distance from the cap (11, 11 ', 11") within the respective hollow chamber ( 3a and 3b) arranged piston plate (12a and 12b, 12a 'and 12b', 12a "and 12b", 32, 42) and a between the cap (11, 11 ', 11 ", 31, 41) and the piston plate ( 12a and 12b, 12a 'and 12b', 12a "and 12b", 32, 42) extending sealing means, characterized in that the sealing means a sealing body (13a and 13b, 13a 'and 13b', 13a "and 13b", 33 , 43) from an el is plastic and / or plastic material which, starting from an assembly state in which it can be inserted into the hollow chamber (3a and 3b), by clamping between the piston plate (12a and 12b, 12a 'and 12b', 12a "and 12b", 32, 42) and the cap (11, 11 ', 11 ", 31, 41) can be transferred in a sealing state in which it is extended in the direction perpendicular to the longitudinal direction (2) of the hollow chamber (3a and 3b), so that it is circumferentially close to the walls (4, 5, 6, 22, 23) delimiting the hollow chamber (3a and 3b). Roller shutter profile according to claim 1, characterized by a connecting element (14a and 14b, 14a 'and 14b', 14a "and 14b") which is located between the cap (11, 11'11 ", 31, 41) and the piston plate (12a and 12b , 12a 'and 12b', 12a "and 12b", 32, 42) and at least during the transfer of the sealing body (13a and 13b, 13a 'and 13b', 13a "and 13b", 33, 43) into the sealing state below Tension stands. Roller shutter profile according to claim 1 or 2, characterized in that it has a plurality of hollow chambers (3a and 3b) which are each separated from one another by a partition (6) running in the longitudinal direction (2) of the hollow body (1,1 "). Roller shutter profile according to claim 3, characterized in that the closure (10, 10 ', 10 ", 30, 40) has a cap (11, 11', 11", 31, 41), which in several hollow chambers (3a and 3b) can be inserted simultaneously and the number of sealing bodies (13a and 13b, 13a 'and 13b, 13a "and 13b", 33, 43) and piston plates (12a and 12b, 12a' and 12b corresponding to the number of hollow chambers (3a and 3b) ', 12a "and 12b", 32, 42) is assigned. Roller shutter profile according to one of claims 2 to 4, characterized in that the connecting element (14a and 14b, 14a 'and 14b', 14a "and 14b") the sealing body (13a and 13b, 13a 'and 13b', 13a "and 13b" , 33, 43) and the cap (11, 11 ', 11 ", 31, 41) penetrates and is movable relative to these in the longitudinal direction (2) of the hollow chambers (3a, 3b). Roller shutter profile according to one of claims 2 to 5, characterized in that the connecting element (14a 'and 14b', 14a "and 14b") is a screw, the thread of which is connected to the piston plate (12a 'and 12b', 12a "and 12b", 32, 42) cooperates. Roller shutter profile according to one of claims 2 to 5, characterized in that the rod-shaped connecting element (14a and 14b) is integrally connected to the piston plate (12a and 12b) and is provided on its surface with barbs (18) which are equipped with a pawl (20a and 20b) cooperate, which is arranged in the cap (11). Roller shutter profile according to one of Claims 1 to 7, characterized in that the piston plate (32) and / or the cap (31) has a conical shape on their end face contact surfaces (35 ', 35 ") facing the sealing body (33) and the sealing body (33 ) is recessed in a complementary cone shape on at least one of its two opposite end faces (35 ', 35 ") corresponding to the contact surfaces (35', 35") of the piston plate (32) and / or the cap (31). Roller shutter profile according to one of Claims 1 to 8, characterized in that the sealing body (43) is provided with a gas filling with an annularly closed cavity which is closed off from the outside (46). Closure (10, 10 ', 10 ", 30, 40) for watertight closure of an elongated roller shutter profile (1, 1") made of plastic or metal according to one of the preceding claims, wherein the closure (10, 10', 10 ", 30, 40) can be at least partially stirred into at least one hollow chamber (3a and 3b) from the front opening thereof and a cap (11, 11 '11 ", 31, 41) and a piston plate arranged at a distance therefrom within the respective hollow chamber (3a and 3b) (12a and 12b, 12a 'and 12b', 12a "and 12b", 32, 42) and one between the piston plate (12a and 12b, 12a 'and 12b', 12a "and 12b", 32, 42) and the cap (11, 11 ', 11 ", 31, 41) arranged sealing means, characterized in that the sealing means comprises a sealing body (13a and 13b, 13a' and 13b ', 13a" and 13b ", 33, 43) made of an elastic and / or plastic material, which, starting from an assembly state in which it can be inserted into the hollow chamber (3a and 3b), by clamping between the pistons plate (12a and 12b, 12a 'and 12b', 12a "and 12b", 32, 42) and the cap (11, 11 ', 11 ", 31, 41) can be converted into a sealing state in which it is perpendicular to the direction to the longitudinal direction (2) of the hollow chamber (3a and 3b) is extended, so that it is circumferentially tight against the walls (4, 5, 6, 22, 23) delimiting the hollow chamber (3a and 3b).

Images