EP0278364A2 - Device for covering door or window openings in buildings - Google Patents

Abstract

Device for covering door or window openings in buildings by means of a covering foil or the like which can be held against the frame by sectional rails to be fastened permanently to the frame, the sectional rails having a U-profile which receives one edge of the covering foil or the like and of which the second leg located opposite the fastening leg on the frame is equipped with a vertically angled plastering web. <IMAGE>

Description

The invention relates to a device for covering window or door openings of buildings by means of a cover sheet or the like that can be attached to the frame with the aid of profile rails that can be permanently attached to the frame.

Covering window or door openings, for example for plastering or painting a building - the same applies to the interior covering when painting or decorating a room - nowadays plastic foils are used almost all the time, which are attached to the frame with the help of adhesive tapes. However, this type of fastening has - in addition to the high expenditure of time and thus the high costs which are necessary for masking a window or door - the disadvantage that such a cover is not reusable. In general, the fine plaster layer can only be applied to the base plaster after a certain time, so that if the house is already occupied, which is often the case nowadays, it is necessary to tear the cover off in the meantime in order to then remove it a few days or weeks from scratch. Accordingly, the same must be done again if the painting work cannot be carried out immediately afterwards, but this is generally not possible due to the necessary drying of the plaster. With every new renovation, be it inside or outside, the masking has to be done again from scratch, and finally there is the fact that the large amounts of film in each case represent a considerable environmental impact, since this does not rot or is difficult to rot plastics that do not decompose at landfill sites and form harmful hydrogen chloride when incinerated.

In order to avoid such difficulties, it has already been proposed to provide inflatable closure bodies which are inserted into the building openings to be closed and braced by the inflation in them. However, this cover described in German Auslegeschrift 1 241 091 has the disadvantage that - in addition to the high costs for the inflatable closure body - they must each be adapted to the size of the window, so that a window or door dimensions corresponding to non-uniform and non-standard dimensions A large number of specially produced closure bodies would have to be specially made.

In addition, an adjustable metal frame has already been proposed in DE-OS 2 126 330, which is spread into the building opening to be covered and then covered with a plastic film. Such a metal frame is extremely costly, however, the adjustability of such a frame is also limited again, so that a cleaning company would have to keep a variety of different frames in stock and wait, which in practice can certainly not lead to satisfactory results.

In addition, from DE-GM 86 11 867 a strip has already become known which permanently fastens to the frame and has a leg hinged to it by means of a broken edge, which is provided with a permanent adhesive coating and enables a cover film to be stuck on. After completing the work, the free-standing leg is simply broken off with the glued-on edge of the film, while the remaining part of the profile rail remains in place, largely stuck in the plaster. However, this arrangement, too, cannot be satisfactory in practice since, on the one hand, the production of these strips is very expensive and, because the leg is broken off with the glued-on film, it is not possible to reuse such a strip for subsequent covers.

In addition, a protective device for window and door openings in buildings has already become known from DE-GM 83 15 042, in which a profile is applied to the frame, which clampingly receives a second profile between an outer leg and the opposite outer surface of the frame, to which in turn a cover film can be attached with the aid of clamping means. However, this is basically the same principle of the utility model 86 11 867 discussed above, the supporting web for fastening the cover film not being integrally formed on the holding profile so as to be detachable, but being releasably fastened. Because of the necessary two different profiles in addition to a clamping means for holding the film, however, this known protective device is again very expensive, with the added factor that if the first profile is not precisely mounted on the frame, the second profile to which the film is to be attached , finds no secure hold at all.

The invention is therefore based on the object of designing a device for covering window or door openings of the type mentioned in such a way that frequent reuse is possible with the simplest construction and very easy installation of the cover.

To solve this problem, the invention provides that the rails, or an edge of the cover sheet or the like. include receiving, U-profile, the second leg opposite the fastening leg on the frame is provided with a vertically angled plaster web.

An essential difference between the profiled rails according to the invention, which is also much simpler, is that the actual cover does not have to be glued to the profiled rail, but is held by engaging in the receiving channel, the opening of which faces the opposite reveal. Of particular importance is also the plastering bridge mentioned, which also enables a guide for a plastering board after the cover has been introduced, so that the profile rail can also be plastered in. The intake channel remains - after it has passed through the protruding cover kung is filled - open, so that it can be used again at any time later to hold a cover, preferably the same one that has been used previously.

In a further development of the invention, it can be provided that the base leg of the U-profile has an extension that forms a second fastening leg and runs parallel and in the direction of the plastering web. A second channel then results between the plastering web and this second fastening leg, which can preferably be used for mounting for plasterboard assembly if a dry plaster is to be applied and is not plastered wet. In addition, this second fastening leg also enables fastening directly in the reveal wall or on a frame part parallel to it.

The fastening legs should preferably be self-adhesive with a removable cover sheet, so that it is only necessary on the building to cut a corresponding piece of a profile rail and press it off after removing the cover sheet against the frame, without further structural measures being necessary. Experience has shown that in this way - in connection with the options for the formation of the actual cover to be retained in the profile rails, which will be discussed later in detail - the windows can be covered two to three times faster than with the aid of the previously usual masking of the film with tapes.

When using the U-shaped rails according to the invention with a wet plaster, it has proven to be expedient that the second leg is provided with a profiled plaster anchoring web formed between its ends in order to produce a good tear-resistant connection with the plaster. This is useful because of the pressure loading of the legs of the U-profile when clamping a cover device, since these alternating loads could otherwise lead to detachment from the plaster too easily.

When using a flexible cover film, it has proven to be particularly expedient in a development of the invention to hold the edges of the cover film in the receiving channel of the U-profile by means of clamping bodies, for example by means of slotted, resilient clamping limbs forming clamping strips around which the edges of the covering film are placed, so that they are both tensioned as well as when the clamping bar is broken into the receiving channel of the profile rail be held clamped.

If not very large openings have to be closed, it is sufficient to provide only profile rails according to the invention even when using flexible foils, since the fixed additional clamp in connection with the tight tension of the foil means the lack of additional savings at the top and bottom edges generally doesn't matter. In the case of large openings, such a profile rail for holding the cover can of course also be attached to the horizontal frame.

To facilitate assembly, it has proven to be advantageous if the terminal strips have a thickened grip edge opposite the slot for forming the spring-loaded clamping legs.

Finally, it is also within the scope of the invention to provide the inside of the U-profile and / or the outside of the clamping body on the inside and / or the outside of the clamping body with a profiling effecting a non-slip clamping locking, in the simplest case in the form of a knob twist.

In some cases it is not easily possible or permissible to apply the U-profile according to the invention to the outside of the frame to be protected, but the installation conditions are such that the U-profile would just lie over an insulation or expansion joint. In order to be able to use the protective device according to the invention easily in these cases as well, in an embodiment of the invention an L-shaped support bracket to be fastened to the wall reveal is provided for holding the U-profile independently of the frame to be covered.

In a further embodiment of the invention, a cover can be provided instead of a film, which is characterized by a plurality of self-supporting, preferably made of transparent plastic, such as e.g. PVC glass, existing cover plates which can be moved relative to one another by connecting devices in the desired displacement position, in which they jointly fill a predetermined reveal opening. This type of cover not only enables larger openings to be filled, since the wind forces can then be better absorbed and there is no risk of the film tearing, but it also results in a cover that is much easier and more frequently reused can be used as flexible foils. The flexible foils allow multiple use on the same building, if the cover is to be removed and reapplied at intervals of days or weeks, but are not particularly suitable for being transferred from one construction site to the next, because yes then the formats of the window openings no longer fit. This problem is now solved by the cover according to the invention, formed from mutually displaceable self-supporting plates.

According to a first embodiment of the invention, it can further be provided that several, preferably four, cover plates are connected by telescopic rods, each of which overlaps the overlapping edges of two mutually displaceable plates and can be extended against the action of tension springs, such a telescopic rod being formed particularly simply thereby can be that on a rigid rod two connected by a coil spring, the edges of the cover plates, hook members are slidably mounted. The plates are prestressed by the telescopic rods in their outwardly shifted largest possible cover area, so that they only have to be pressed together for insertion into a given window opening, so that they automatically deflect into the receiving channels of the mounting rails when released. So that the hook links do not simply detach from the edges and the telescopic rods fall down, the hook links which are tiltable on the rod should be provided with a clamping bead, so that the overlapping leg is wedged around the edge of the cover plate under the action of this clamping mask and is thus held in a clamping manner.

In a further embodiment of the cover according to the invention made of self-supporting cover plates connected to each other to form a connecting device, it is provided that four cover plates each with longitudinal slots arranged alternately in one of their diagonals can be locked in a continuously variable displacement position by a connecting bolt with clamping members penetrating all slots. The four plates, two in one and two in the other diagonal, are provided with longitudinal slots that extend as far as possible to the corners, so that a large mutual displacement is possible, each allow one plate in the direction of a corner of the pull out the original rectangular or square plate stack, so that a continuous increase in both the height and the width of the cover is possible, the desired extension format is locked by the clamping members of the connecting bolt, through which the plates are firmly clamped together.

It has proven to be particularly advantageous if the bolt or the like at one end for support on the window pane. serving vacuum cleaner, since in this way not the entire surface of the cover is suspended self-supporting only at the edges, but an additional support in the middle significantly reduces the risk of detachment and bending by wind forces.

Instead of the aforementioned four cover slits, which can be pulled apart in the four diagonal directions and each have longitudinal slots running in the diagonals, it can be provided according to a third embodiment of the invention that at least one cover plate provided with a longitudinal slot centrally arranged in parallel between two opposite outer edges opposite at least one the bolt passing through the longitudinal slot can be locked and moved with the holding plate holding the locking devices. Through this embodiment it is possible to overcome very large widths, since in the end any number of such longitudinally slotted plates can be alternately joined with holding plates. This is the easiest way to adapt to the largest dimension of a window opening, regardless of whether this is the height or the width of the window, while choosing the other dimension of the panels so that they either match the corresponding one Dimension of the window corresponds, or that several extendable plate strips placed one above the other or next to each other fill the recess to be covered. In particular if there are more than two cover plates which can be pulled out in this way, it is advantageous to provide a guide rail for the slotted extension cover plates which can be placed on the bolts of the holding plate and project laterally beyond the holding plate.

The design of the connecting bolts can be made particularly simple if, as is provided in a development of the invention, the threaded bolt has a fixed plate and a wing nut or the like serving as a clamping member, the plate of the bolt being fixed to the respective cover plate connected, in particular glued, which also considerably reduces the risk of losing the connecting devices.

The rigid covers according to the invention can also be held by engaging their edges in the receiving channel of a profile rail permanently fastened to the frame of the type described above, in general additional clamping members are no longer required or at most to prevent the cover from rattling if the thickness of the Plates or, in the case of diagonally separable, the double thickness of the plates does not correspond to the width of the receiving channel. In addition, however, these covers composed of rigid cover plates, which allow a change in format, can also be installed very easily without the profile lines by providing nail openings on their outer edges and the like or by some nails on the frame of the window to be covered. be attached. Disassembly only requires pulling out the few Nails, the reuse of such a cover at a later point in time on the same window or at another construction site is also evident.

• Fig. 1 einen Schnitt durch einen Fensterrahmen mit einer erfindungsgemäßen Abdeckvorrichtung,
• Fig. 2 eine vergrößerte Darstellung der in Fig. 1 verwendeten Profilschiene,
• Fig. 3 eine abgewandelte Ausführungsform der Profil­schiene,
• Fig. 4 einen vergrößerten Schnitt durch die eingebaute Profilschiene in Fig. 1 zur Darstellung der Klemmhalterung der Abdeckfolie,
• Fig. 5 eine Aufsicht auf eine selbsttragende, aus vier Platten zusammengesetzte Abdeckung,
• Fig. 6 einen vergrößerten Schnitt längs der Linie VI-VI in Fig. 5,
• Fig. 7 eine vergrößerte Darstellung der Teleskopstange zur federnden Verbindung der Platten der Ab­deckung nach Fig. 5,
• Fig. 8 eine zweite Ausführungsform einer selbsttragenden Abdeckung aus feststellbar gegeneinander verschieb­baren Platten,
• Fig. 9 eine Darstellung einer Einzelplatte,
• Fig. 10 einen vergrößerten Schnitt längs der Linie X-X in Fig. 8,
• Fig. 11 eine Darstellung einer dritten Ausführungsform einer aus Einzelplatten zusammenfügbaren selbstragenden Abdeckung,
• Fig. 12 einen Schnitt längs der Linie XII-XII in Fig. 11,
• Fig. 13 eine Teildarstellung einer abgewandelten Ab­deckung nach Fig. 11 mit zusätzlicher Führungs­schiene und gekröpften Außenplatten,
• Fig. 14 einen Schnitt durch einen Fensterrahmen mit einer erfindungsgemäßen Abdeckvorrichtung, bei der das U-Profil an einem gesonderten Befesti­gungswinkel gehaltert ist und
• Fig. 15 eine perspektivische Explosionsdarstellung eines abgewandelten U-Profils sowie einer etwas geänder­ten Klemmleiste zur Halterung einer Abdeckfolie.

Further advantages, features and details of the invention result from the following description of some exemplary embodiments and from the drawing. Show:

• 1 shows a section through a window frame with a covering device according to the invention,
• 2 is an enlarged view of the profile rail used in Fig. 1,
• 3 shows a modified embodiment of the profile rail,
• 4 shows an enlarged section through the built-in profile rail in FIG. 1 to illustrate the clamping holder of the cover film,
• 5 is a plan view of a self-supporting cover composed of four plates,
• 6 is an enlarged section along the line VI-VI in Fig. 5,
• 7 is an enlarged view of the telescopic rod for the resilient connection of the plates of the cover of FIG. 5,
• 8 shows a second embodiment of a self-supporting cover consisting of plates which can be locked relative to one another,
• 9 is an illustration of a single plate,
• 10 is an enlarged section along the line XX in Fig. 8,
• 11 shows a third embodiment of a self-supporting cover that can be assembled from individual plates,
• 12 shows a section along the line XII-XII in FIG. 11,
• 13 is a partial representation of a modified cover according to FIG. 11 with an additional guide rail and cranked outer plates,
• Fig. 14 shows a section through a window frame with a covering device according to the invention, in which the U-profile is held on a separate mounting bracket and
• 15 is an exploded perspective view of a modified U-profile and a slightly modified terminal strip for holding a cover film.

In Fig. 1 you can see the window frame 1 - because of the applicability of the invention to a wide variety of building openings we generally speak of "frame" in the following - and a window sash 2. On the floor frame 1, a plastic profile rail 4 is glued on next to a roller blind rail 3, which comprises a U-profile 5 and an angled plastering web 6. A self-adhesive coating 7 with a removable cover sheet 8 is applied to the outside of the leg of the U-profile opposite the plastering web, so that the profile can be easily glued to the stick frame 1 during construction. The receiving channel 9 of the profile rail is used to tear in the lateral edge of a cover, in Fig. 1 a plastic film 10, the edges of which are placed around a slotted terminal strip 11, the legs 12 formed by the slit ensure a firm clamping bracket in the receiving channel 9. A thickened grip edge 13 facilitates the handling of the terminal strip.

The plastering bridge 6 enables plastering of the profile rail 4 which has already been glued to the frame before the plastering is applied, by providing a contact edge for a rubbing board forms. In general, it is sufficient to provide a profile rail 4 according to the invention on the left and right of a door or window opening on the respective frame in order to have a very simple possibility of attaching a variable cover for the future, in which both the cover itself is reusable as also the application of the cover can be done much easier, faster and therefore also cheaper than was the case with the usual masking.

FIGS. 5 to 7 show a variant of a reusable cover according to the invention, in which not a flexible film - as has hitherto been customary - is used, but self-supporting cover plates made of transparent plastic or the like which can be displaced relative to one another. The plates 14 are connected to each other by telescopic rods 15 such that the cover plates 14 are each biased outwards by the resilient telescopic rods in the largest-sized displacement position. By pressing the panels together, they can be brought to the desired format of a window opening, in which case the edges can automatically spring into the profile rails 4 on the respective frame. The receiving channel 9 of the profile 4 is twice as wide as the thickness of a plate so that they also fit into the receiving channel in the overlap area. The resilient telescopic rods in the illustrated embodiment are constructed very simply in such a way that two hook members 18 which are connected to one another by a helical tension spring 17 are mounted in a longitudinally displaceable manner and which, as can be seen in particular from FIG. 6, overlap the edges of two cover plates . A clamping bead causes the edges of the cover plates 14 to jam in the hook members, so that the cover plates 14 are held together by the telescopic rods 15.

The nail holes 20 provided on the side edges of the cover plates - if necessary such nail holes could be provided all around on the edges of each cover plate 14 - enable a self-supporting cover according to FIGS. 5 to 7 to be attached directly to a frame which is not provided with in a modification of the invention the preferred one to use Profile rails 4 is provided. Such a rigid covering, as shown in FIG. 5, can also be nailed directly to a frame with the aid of the nail holes with a few nails and simply dismantled again and later reattached to the frame for further use. This usability of the rigid self-supporting cover even without the profile rails 4 also applies to the two exemplary embodiments of such covers shown in FIGS. 8 to 10 and 11 to 13, described in detail below.

Figures 8 to 10 show a second embodiment of a self-supporting cover made of four mutually displaceable, identically designed cover plates 14ʹ. The plates are each provided with a longitudinal slot 21 running in a diagonal, the orientation of the plates being such that in two the longitudinal slots are arranged along one diagonal and in the other along the other diagonal. In this way, the plates, which can be fixed in any pull-out position by a connecting bolt 22 passing through all the longitudinal slots 21, can be pulled outward in the direction of the arrows shown in FIG. 8 and thus any desired one - of course within the scope of the size dimensions of the plates 14ʹ horizontal - set cover formats. After setting the desired format size, which corresponds to the opening of the building to be covered, the plates 14 'are clamped against a fixed contact plate 25 with the aid of a clamping member, in the exemplary embodiment shown a wing nut 24 screwed onto the thread 23 of the connecting bolt 22, and the locked pull-out position is thus locked . A vacuum suction device 26 enables the plate pack to be supported on the glass pane. In order to adapt the arrangement of the vacuum cleaner to the respective distance of the glass pane from the profile rail 4, the connecting bolt 22 is provided with an internal thread, into which a rod 27 with an external thread is screwed, which has the vacuum cleaner at its inner end 26 wears. The desired distance of the vacuum suction device 26 can be obtained by screwing the bar 27 in or turning it back adjust from the plate pack and lock with a wing nut 28.

In the embodiment of a further self-supporting cover made of mutually displaceable plates, which is shown in FIGS. 11 to 13, holding plates 14a with bolts 30 and cover plates 14b provided with a central longitudinal slot 31 are used alternately, at least one holding plate and one slotted cover plate being provided , but the arrangement can also comprise a plurality of the two plate types. The plates 32, which can in turn be clamped against one another by the wing nuts 32 to be screwed onto the bolts 30, can be pulled out laterally. As indicated in Fig. 11, and so set to a desired width, it is advantageous in the case of several plates if an extension guide rail 33 is also used, which at the same time also stiffens the arrangement. 11 to 13 is either adjusted in height to the height or width of the opening to be covered or, preferably, designed such that a plurality of pull-out strips of covers arranged one above the other or next to one another then ultimately fill the respective building opening. The provision of a cranked cover plate 14b, as shown on the right in FIG. 13, makes it possible to attach the cover relatively far in front of the frame and thus also the window, so that on the one hand there is space for the guide rail and possibly also for a vacuum. Suction cup is available between the cover and the window pane.

14 shows a modified embodiment of a protective device according to the invention, the U-profile 5 not being glued to the window frame 1 itself, but - after it should come to rest over an insulation 35 - on a separate L-shaped support bracket 36 one leg 37 is attached to the masonry, for example nailed, while the second leg 38 protruding forwardly carries the U-profile 5. The U-profile used in FIG. 14 is additionally provided with a plaster anchoring web 39 formed between the ends of the second leg 5b is provided with a tooth-like profile for better anchoring in the plaster.

In addition, as is shown in FIG. 15, the U-profile 5 can be provided on the inside with a longitudinal groove profile 40 (which of course could also be present on both legs), while at the same time the engagement end of the terminal block 11 is also provided with a groove profile 41 , so that a non-slip clamping lock is given when inserting the terminal block 11 into the groove of the U-profile, even if the cover sheet to be held is placed around the end of the terminal block 11. In addition, one can see in FIG. 15 handle openings 42 with which the terminal strip 11 is preferably provided at regular intervals in order to better grip the terminal strip after completion of the work and to be able to pull it out of the U-profile 5 more easily in order to remove the cover film.

The invention is not restricted to the exemplary embodiments shown. In particular, it would also be possible to apply a self-adhesive coating not only to one leg, but also to the base leg of the profile rail 4, which would make it possible not only to lay the profile rail on a surface lying in the window plane, but also on a surface oriented perpendicularly to it Attach surface of the frame. In addition, the profile shown in FIG. 3, with an additional web 6a parallel to the plastering web 6, offers a very simple possibility of plasterboard assembly, the plasterboard plasterboards being able to engage in the U-profile formed thereby. The expansion joint foam strip shown in FIG. 2 can also be omitted as required.

In addition, the plaster anchoring web 3g could also be provided with a large number of relatively large, preferably round, holes through which the plaster is connected to one another on both sides of the plaster anchoring web, so that in this way both a better anchoring of the plaster anchoring web itself and thus also the strip is guaranteed, as well as the risk of chipping of the thin outer plaster layer is counteracted. In addition, the longitudinal profile 41 of the terminal block 11 in FIG. 15 can also be provided over the entire surface.

Claims (22)

1. Device for covering window or door openings of buildings by means of a cover sheet or the like which can be permanently attached to the frame with the aid of profile rails or the like, characterized in that the profile rails (4) have an edge of the cover sheet (10) or the like. receiving U-profile (5), the second leg (5b) opposite the fastening leg (5a) on the frame is provided with a vertically angled plastering web (6). 2. Device according to claim 1, characterized in that the base leg (5c) of the U-profile (5) parallel and in the direction of the plaster web has a second fastening snail (6a) forming an extension. 3. Apparatus according to claim 1 or 2, characterized in that the fastening legs (5a, 6a) are self-adhesive with a removable cover sheet (8). 4. Device according to one of claims 1 to 3, characterized in that the second leg (5b) is provided with a molded plaster anchoring web (39) formed between its ends. 5. The device according to claim 4, characterized in that the plaster anchoring web (39) with a A large number of relatively large, preferably round, plaster connection opening is provided. 6. Device according to one of claims 1 to 5, characterized by the edges of the cover film (10) or the like. Clamping bodies holding in the receiving channel of the U-profile. 7. The device according to claim 6, characterized in that the clamping bodies are slotted, resilient clamping legs (12) forming terminal strips (11). 8. A device according to claim 7, characterized in that the terminal strips (11) have a thickened grip edge (14). 9. Device according to one of claims 1 to 8, characterized in that the U-profile (5) on the inside and / or the clamping body (11) on the outside are provided with a non-slip clamping locking profile (40, 41). 10. Device according to one of claims 7 to 9, characterized in that the terminal strip (11) is provided with a plurality of handle openings (42). 11. The device according to one of claims 1 to 10, characterized by an L-shaped mounting bracket (36) to be fastened to the wall reveal for holding the U-profile (5). 12. Cover in particular for a device according to one of claims 1 to 11, characterized by a plurality of self-supporting, preferably made of transparent plastic cover plate ten (14, 14ʹ, 14a, 14b), which can be held against one another by connecting devices in the desired displacement position to fill a predetermined reveal opening. 13. Cover according to claim 12, characterized in that several, preferably four, cover plates (14) are connected by respective overlapping edges of two mutually displaceable plates (14) engaging, extendable against the action of tension springs telescopic rods (15). 14. Cover according to claim 13, characterized in that on a rod (16) two by a coil spring (17) interconnected, the edges of the cover plates (14) overlapping hook members (18) are slidably mounted. 15. Cover according to claim 14, characterized in that the hook members guided tiltably on the rod are provided with a clamping bead. 16. Cover according to claim 12, characterized in that four cover plates (14ʹ) with alternately arranged in one of their diagonally arranged longitudinal slots (21), through a slot penetrating connecting bolt (22) with clamping members (24, 25) in continuously variable displacement positions can be locked. 17. Cover according to claim 16, characterized in that the connecting bolt (22) or the like at one end for support on the window pane. serving vacuum cleaner (26). 18. Cover according to claim 12, characterized in that at least one with a central longitudinal slot (31) provided cover plate (14b) relative to at least one, a longitudinal slot bolt (30) with locking device (32) carrying holding plate (14a) is lockable . 19. Cover according to claim 18, characterized by a laterally projecting guide rail (33) for the slotted extension cover plates (14b) which can be placed on the bolts (30) of the holding plate (14a). 20. Cover according to one of claims 17 to 19, characterized in that the connecting bolt (22, 30) provided with an external thread has a fixed plate and a wing nut (24, 32) or the like serving as a clamping member. having. 21. Cover according to claim 20, characterized in that the plate (25) of the connecting bolt is firmly connected to the respective cover plate, in particular is glued. 22. Cover according to one of claims 12 to 21, characterized in that the cover plates (14, 14, 14a, 14b) are provided on their outer edges with nail openings (20).

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