Building panel adapted to be mounted at a ceiling or wall of a room and method of manufacturing such building panel

Abstract

A flexible sheet (7) is extended in a tensioned state between frame profile members (6) and is bent about outer edges (8) of the frame profile members. Edges (11) of the flexible sheet are fixed to a building-facing side (10) of the frame profile members by means of tensioning profile members (12), each forming a space (13) between two wall parts (14, 15), wherein a corresponding tensioning profile member is guided between the two wall parts and is spring-biased by a number of spring elements (16) in a tensioning direction (DT) directed away from the outer edge of the frame profile member. The outer edge of said frame profile member is formed by a connection (17) between the two wall parts, and said number of spring elements are arranged in the space of said frame profile member between said connection and the corresponding tensioning profile member.

Description

[0001] The present invention relates to a building panel adapted to be mounted at a ceiling or wall of a room so that a framework of the building panel has a room-facing side and a building-facing side, wherein the framework includes a peripheral frame formed by frame profile members, wherein a flexible sheet, such as a textile or foil, is extended in a tensioned state over the room-facing side of the framework between the frame profile members, wherein each frame profile member forms an outer edge connecting a room-facing side of the frame profile member with a building-facing side of the frame profile member, wherein the flexible sheet is bent about the outer edges of the frame profile members, wherein edges of the flexible sheet are fixed to the building-facing side of respective frame profile members by means of tensioning profile members, wherein each frame profile member forms a space between two wall parts, wherein a corresponding tensioning profile member is guided between the two wall parts and spring-biased by a number of spring elements for displacement in a tensioning direction directed away from the outer edge of the frame profile member for bringing the flexible sheet into the tensioned state.

[0002] WO 2019 / 002915 (Kvadrat Soft Cells A / S, Price Industries Limited) discloses a thermally activated building panel in which a textile is extended in a tensioned state over a room-facing side of a framework between frame profile members. Edges of the textile are fixed to a building-facing side of the respective frame profile members by means of tensioning profile members wherein each edge of the textile is retained in a groove of a corresponding tensioning profile member by means of a keder. Each frame profile member forms a space between two wall parts, wherein a corresponding tensioning profile member is guided. The tensioning profile member is by means of a number of spring elements biased for displacement in a direction into the space between the two wall parts for bringing the textile into the tensioned state. However, in order to insert the tensioning profile member in its guided position in the space between the two wall parts, the spring elements have to be arranged subsequently as they would otherwise block the entrance into the space. In order to retain the tensioning profile member in a release position before tensioning the textile, a number of brackets are used to hold the tensioning profile member in position as the spring elements are inserted. In this position of the tensioning profile member, the spring elements have to be compressed substantially during insertion, thereby complicating assembly. Furthermore, in the tensioned state of the textile, the tensioning profile member is located at least partly inside the space formed between the two wall parts. As a consequence, it may be challenging to get hold on the tensioning profile member in order to release the tension of the tensioning profile member on the textile and subsequently detach the edge of the textile, for example in the case that the textile needs washing.

[0003] WO 2019 / 229157 (Kvadrat Soft Cells A / S) discloses a building panel including a frame formed by profile members and a plate member extending therebetween. A textile extends between the profile members which are formed by bending an edge area of a metal plate forming the plate member, thereby forming said profile members in one piece with the plate member. Said edge area forms a rounded edge connecting the plate member with the profile member. The profile member forms a space between two wall parts, wherein a corresponding tensioning profile member is guided. The tensioning profile member is by means of a number of spring elements biased for displacement in a direction into the space between the two wall parts for bringing the textile into the tensioned state. However, assembly and disassembly of the panel and tensioning profile member may be challenging for the reasons explained above.

[0004] WO 2005 / 073482 discloses a building panel in which a textile is extended in a tensioned state over a room-facing side of a framework between frame profile members. Edges of the textile are fixed to a building-facing side of the respective frame profile members by means of tensioning profile members wherein each edge of the textile is retained in a groove of a corresponding tensioning profile member by means of a resilient attachment clip. Each frame profile member forms a space between two wall parts, wherein a corresponding tensioning profile member is guided. The tensioning profile member is by means of a number of spring elements biased for displacement in a direction into the space between the two wall parts for bringing the textile into the tensioned state.

[0005] WO 2022 / 079631 discloses a single-sided as well as a double-sided tensioning system for the dynamic tensioning of a canvas provided on one or both sides of a frame assembled substantially from four or more frame profiles. The tensioning system comprises a frame profile comprising a back wall with an upright central part and two upright side walls, which extend in the lateral direction of the frame. A guide provided with a means for fastening the canvas is mounted movably in the lateral direction in the frame profile between the central part and a side wall. A number of springs are tensioned between a stop and the guide so that the guide can tension dynamically in the central direction of the frame by sliding into the space between the central part and the side wall. A locking element comprises coupling means and a blocking piece, wherein the coupling means is configured for coupling the locking element to the central part. The blocking piece is arranged so that it can block a movement of the guide in at least one direction so that the canvas may be unclamped without uncoupling it, which ensures that even in the unclamped state the canvas does not fall out. This may also allow dismounting of the canvas to take place more easily and more user-friendly. However, this tensioning system is rather bulky and the assembly thereof is also rather cumbersome due to the fact that the springs have to be inserted into their tensioned state after arranging the guide in the space between the central part and the side wall. The use of a separate locking element for blocking movement of the guide during dismounting of the canvas adds to the complexity of the system.

[0006] EP 3 505 697 B1 discloses a wall or ceiling covering with a circumferential frame, a membrane being mounted at the frame, and with a clamping piece which is movably guided in an accommodation space of the frame along a clamping way. The clamping piece may be adjusted to a desired tensioning of the membrane by means of an adjustment screw. Additionally, a compression spring may be arranged in order to further secure tension of the membrane during the service life of the product. However, the suggested arrangement of the spring does not allow for a substantial spring force in a compact construction, because rather little space is provided for the spring. Therefore, this arrangement of the spring is in reality only useable in combination with an adjustment screw.

[0007] DE 10 2018 126 856 A1 discloses a mounting device for flexible webbings wherein an edge of the webbing is provided with a keder arranged in a tensioning profile being vertically displaceable inside a housing of the device in order to tension the flexible webbing. The flexible webbing is bent about an edge of a U-formed main housing part which is closed by a cover plate. A gap is provided between said edge of the U-formed main housing part and the cover plate through which gap the flexible webbing enters the housing. The height of the tensioning profile is adjustable by means of an adjusting screw acting via a compression spring and an adjusting profile. The adjusting profile is guided vertically on the adjusting screw. A disadvantage of this device is that the cover plate is visible from the room in which the flexible webbing is arranged.

[0008] CN 113756529 A discloses a flexible facing product. Tensioning devices are installed and arranged on opposite side portions of a flexible facing sheet to tension both sides of the flexible facing sheet. The tensioning device includes a main body profile located at the back of the flexible facing sheet and is fixedly connected to a wall or a fixed keel. The main body profile comprises an arc-shaped abutment portion which abuts outwardly against the side portion of the flexible facing sheet, a support portion extending inwardly from the arc-shaped abutment portion, and a winding portion extending outwardly from the arc-shaped abutment portion and used for winding up the side portion. The main body profile is further provided with a fixing structure for securing a free end of the side portion of the flexible facing sheet. The fixing structure includes a slider arranged inside the arc-shaped abutment portion, and the free end of the side portion of the flexible facing sheet is fixedly connected to a raised edge strip which is clamped and fitted to a receiving cavity of the slider. Inner walls of the winding portion, the arc-shaped abutment portion and the support portion surround and form a sliding cavity for displacement of the slider. An adjustment mechanism for adjusting tension states of the flexible facing sheet comprises the slider and a butterfly spring hinge abutting elastically against an end of the slider and a limit stop surface formed in the interior of the main body profile. Thereby, the slider is biased for displacement in a tensioning direction directed towards the arc-shaped abutment portion. However, once assembled, it may be challenging releasing the tension of the slider on the flexible facing sheet and subsequently detach the side portion of the flexible facing sheet, for example in the case that the flexible facing sheet needs washing. In the tensioned state of the flexible facing sheet, the slider is located fully inside the sliding cavity, and it may therefore be difficult getting hold on the slider in order to release the tension thereof.

[0009] The object of the present invention is to provide a building panel wherein assembly of the panel as well as removal and subsequent refitting of the tensioned flexible sheet are facilitated.

[0010] In view of this object, the outer edge of said frame profile member is formed by a connection between the two wall parts, and said number of spring elements are arranged in the space of said frame profile member between said connection and the corresponding tensioning profile member.

[0011] In this way, in their relaxed, uncompressed state, the spring elements may easily be inserted into the space between the two wall parts of the frame profile member, and subsequently, the tensioning profile member may simply be pressed into said space in a guided configuration whereby the spring elements may be compressed by the displacement of the tensioning profile member. By holding the tensioning profile member in a slightly retracted position, in which the spring elements are in a tensioned state, an edge of the flexible sheet may be attached to the tensioning profile member, and subsequently, the tensioning profile member may be released, whereupon the spring elements will cause the tensioning profile member to slide in the tensioning direction away from the outer edge of the frame profile member so that the flexible sheet is brought into its tensioned state. Furthermore, in the case that the flexible sheet needs washing or replacement, the tension of the tensioning profile member on the flexible sheet may easily be released by simply pressing the tensioning profile member further into said space, against the tensioning direction thereof. Subsequently, the flexible sheet may easily be disconnected from the tensioning profile member.

[0012] Furthermore, in the building panel according to the present invention, each frame profile member may advantageously be formed by bending or roll forming a piece of sheet metal, whereby the outer edge of the frame profile member may be formed as a, preferably rounded, bent connection between the two wall parts each formed by the sheet metal.

[0013] In an embodiment, a first part of each spring element abuts the connection between the two wall parts of a corresponding frame profile member. Thereby, by arranging the first part of each spring element close to the outer edge of the frame profile member, a suitable spring force may be obtained in a compact construction of the frame profile members.

[0014] In an embodiment, a second part of each spring element engages a longitudinal groove of the corresponding tensioning profile member. Thereby, correct positioning of the second part of each spring element in relation to the corresponding tensioning profile member may be ensured, because the spring element may locate itself in the longitudinal groove of the corresponding tensioning profile member when the tensioning profile member is inserted into the space between two wall parts of the corresponding frame profile member.

[0015] In an embodiment, the longitudinal groove of the tensioning profile member is formed between two opposed flanges of the tensioning profile member, and outer faces of the opposed flanges are arranged to slide along respective inner faces of the two wall parts of the frame profile member. Thereby, because in this way, a substantial part of each spring element may be taken up in the longitudinal groove, a suitable spring force may be obtained in a compact construction of the frame profile members.

[0016] In a structurally particularly advantageous embodiment, each tensioning profile member includes a sliding part which is guided between the two wall parts of the frame profile member and a flexible sheet attachment part to which an edge of the flexible sheet is fixed.

[0017] In an embodiment, said flexible sheet attachment part is located outside the space formed between the two wall parts. Thereby, attachment of the edge of the flexible sheet to the tensioning profile member may be facilitated in that the tensioning profile member may be arranged with its sliding part guided between the two wall parts of the frame profile member before the flexible sheet is attached to the flexible sheet attachment part of the tensioning profile member. Furthermore, because the flexible sheet attachment part is located outside the space formed between the two wall parts, the flexible sheet attachment part may have a suitable size, i.e. a width larger than the width of the space formed between the two wall parts, thereby facilitating easy and strong attachment of the flexible sheet to the tensioning profile member. Removal of the flexible sheet from the tensioning profile member may also be facilitated, which may be practical, for instance in the case that the flexible sheet needs washing.

[0018] In an embodiment, each tensioning profile member is displaceable in the tensioning direction in relation to the corresponding frame profile member from a flexible sheet attachment position in which the tensioning profile member is releasably retained in relation to the frame profile member to a flexible sheet tensioning position in which the flexible sheet is in the tensioned state. Thereby, the tensioning profile member may be fixed in a retracted state in the flexible sheet attachment position, in which the spring elements are in a tensioned state, whereby an edge of the flexible sheet may be attached to the tensioning profile member in a relaxed state of the flexible sheet, and subsequently, the tensioning profile member may be released from its retained position, whereupon the spring elements will cause the tensioning profile member to slide in the tensioning direction away from the flexible sheet attachment position to the flexible sheet tensioning position in which the flexible sheet is tensioned. Because the tensioning profile member may be retained temporarily in the flexible sheet attachment position, the attachment of the flexible sheet to the tensioning profile member may be greatly facilitated, as the flexible sheet may easily be attached to the tensioning profile member in a relaxed state of the flexible sheet without the user having to press the tensioning profile member against the spring force during attachment.

[0019] In a structurally particularly advantageous embodiment, the tensioning profile member is releasably retained in the flexible sheet attachment position by engagement between the tensioning profile member and the frame profile member.

[0020] In a structurally particularly advantageous embodiment, the tensioning profile member is releasably retained in the flexible sheet attachment position by engagement between a protrusion or a recess of the tensioning profile member and a corresponding protrusion or recess of the frame profile member. Thereby, the tensioning profile member may easily be released from its retained state in the flexible sheet attachment position by simply tilting the tensioning profile member slightly in relation to the frame profile member so that the corresponding protrusion and recess may disengage from each other.

[0021] In an embodiment, said protrusion or said recess of the tensioning profile member is arranged at the flexible sheet attachment part. Thereby, both the flexible sheet attachment part and said protrusion or said recess may be arranged easily accessible outside the space formed between the two wall parts, thereby facilitating both attachment of the flexible sheet to the tensioning profile member and disengagement of the tensioning profile member from its flexible sheet attachment position in relation to the frame profile member.

[0022] In a structurally particularly advantageous embodiment, the flexible sheet attachment part of the tensioning profile member forms a longitudinal channel with which a corresponding edge of the flexible sheet is releasably connected, the longitudinal channel is formed by at least one wall part, and said wall part forms said protrusion or said recess of the tensioning profile member.

[0023] In an embodiment, the tensioning profile member is releasable from the flexible sheet attachment position by elastic deformation of the tensioning profile member and / or of the frame profile member. Thereby, the tensioning profile member may be even better fixed in the flexible sheet attachment position during attachment of the flexible sheet to the tensioning profile member, and at the same time easy disengagement of the tensioning profile member from the flexible sheet attachment position may be possible by slightly tilting the tensioning profile member in relation to the frame profile member so that the corresponding protrusion and recess may disengage from each other as a result of said elastic deformation of the tensioning profile member and / or of the frame profile member.

[0024] The present invention further relates to a method of manufacturing a building panel adapted to be mounted at a ceiling or wall of a room so that a framework of the building panel has a room-facing side and a building-facing side, wherein the framework includes a peripheral frame formed by frame profile members, wherein each frame profile member forms an outer edge connecting a room-facing side of the frame profile member with a building-facing side of the frame profile member, wherein each frame profile member forms a space between two wall parts for guidance of a corresponding tensioning profile member between the two wall parts, and wherein the method includes the steps of arranging a corresponding tensioning profile member in guided configuration between the two wall parts of each frame profile member so that is it spring-biased by a number of spring elements for displacement in a tensioning direction directed away from the outer edge of the frame profile member for bringing a flexible sheet, such as a textile or foil, into a tensioned state, extending the flexible sheet, over the room-facing side of the framework between the frame profile members, bending the flexible sheet about the outer edges of the frame profile members, fixing edges of the flexible sheet to the building-facing side of respective frame profile members by means of the tensioning profile members, and tensioning the flexible sheet by displacement of each tensioning profile member in its corresponding tensioning direction.

[0025] The method according to the invention is characterised by performing the following steps in the mentioned order: arranging said number of spring elements in the space of said frame profile member, pressing a corresponding tensioning profile member into the space against the spring-bias of the spring elements and against the tensioning direction, connecting the flexible sheet to the tensioning profile member, and displacing, by means of the spring-bias of the spring elements, the tensioning profile member in a direction out of the space and in the tensioning direction until the flexible sheet is brought into its tensioned state. Thereby, the above-mentioned features may be obtained.

[0026] In an embodiment, the method includes the step of, before connecting the flexible sheet to the tensioning profile member, releasably retaining the tensioning profile member in a flexible sheet attachment position in relation to the frame profile member, and the step of, after connecting the flexible sheet to the tensioning profile member, releasing the tensioning profile member from the flexible sheet attachment position in relation to the frame profile member. Thereby, the above-mentioned features may be obtained.

[0027] In an embodiment, the tensioning profile member is being released from the flexible sheet attachment position in relation to the frame profile member by inserting a tool between the tensioning profile member and a part of the corresponding frame profile member and twisting the tool at least slightly, thereby at least slightly flexing the tensioning profile member and / or the frame profile member. Thereby, the above-mentioned features may be obtained.

[0028] The invention will now be explained in more detail below by means of examples of embodiments with reference to the very schematic drawing, in which Fig. 1 is a cross-sectional view of part of a prior art building panel; Fig. 2 is a perspective cross-sectional view of the part of the prior art building panel of Fig. 1, however, whereby a tensioning profile member is positioned in a flexible sheet attachment position, before attachment of the flexible sheet to the building panel; Fig. 3 is a perspective cross-sectional view of a part of a building panel according to the present invention, whereby a tensioning profile member is positioned in a flexible sheet attachment position, before attachment of the flexible sheet to the building panel; Fig. 4 is a cross-sectional view of the part of the building panel of Fig. 3, however, before insertion of the tensioning profile member into a frame profile member; Fig. 5 is a cross-sectional view corresponding to that of Fig. 4, however, after insertion of the tensioning profile member into the frame profile member, but before displacing the tensioning profile member to its flexible sheet attachment position; Fig. 6 is a cross-sectional view corresponding to that of Fig. 5, however, after displacement of the tensioning profile member to its flexible sheet attachment position; Fig. 7 is a cross-sectional view corresponding to that of Fig. 6, however, after attachment of an edge of a flexible sheet to the tensioning profile member; Fig. 8 is a cross-sectional view corresponding to that of Fig. 7, however, after displacement of the tensioning profile member to a flexible sheet tensioning position; Fig. 9 is a cross-sectional view of a frame profile member of the building panel of Figs. 3 to 8, before assembly of the building panel; Fig. 10 is a perspective cross-sectional view of the frame profile member of Fig. 9; Fig. 11 is a perspective cross-sectional view of a tensioning profile member of the building panel of Figs. 3 to 8, before assembly of the building panel; Fig. 12 is a perspective view of a spring element of the building panel of Figs. 3 to 8; Fig. 13 is a perspective view of the building panel of Figs. 3 to 8, with different attachment fittings mounted, however, without the flexible sheet attached; Fig. 14 is a longitudinal cross-section through the building panel of Fig. 13, however, without the different attachment fittings mounted and without an absorber element and flexible sheet attached; Fig. 15 is an exploded perspective view of a corner of the building panel of Fig. 13, however, without the flexible sheet illustrated; Fig. 16 is a perspective view seen from behind of the corner piece of Fig. 15, however, wherein a resilient member has been inserted into the corner piece; Fig. 17 is a perspective view of the corner of the building panel of Fig. 15, during attachment of the flexible sheet; Fig. 18 is a perspective view of the corner of the building panel of Fig. 17, after attachment of the flexible sheet; Fig. 19 is a perspective view of part of the building panel of Fig. 13, however, without an absorber element attached and without flexible sheet attached; Fig. 20 is a perspective view of a first attachment fitting of the building panel of Fig. 13; and Fig. 21 is a perspective view of a second attachment fitting of the building panel of Fig. 13.

[0029] In the following, generally, similar elements of different embodiments and of the illustrated prior art have been designated by the same reference numerals.

[0030] Figs. 1 and 2 illustrate a part of a prior art building panel in which a flexible sheet 7 is extended in a tensioned state between frame profile members 6. Edges 11 of the flexible sheet 7 are fixed to a building-facing side 10 of the respective frame profile members 6 by means of tensioning profile members 12 wherein each edge of the flexible sheet 7 is retained in a longitudinal channel 31 of a corresponding tensioning profile member 12 by means of a number of holding elements 41. Each frame profile member 6 forms a space 13 between two wall parts 14, 15, wherein a corresponding tensioning profile 12 member is guided. The tensioning profile member 12 is by means of a number of spring elements 16 biased for displacement in a tensioning direction D T into the space 13 between the two wall parts 14, 15 for bringing the flexible sheet 7 into the tensioned state.

[0031] However, in order to insert the tensioning profile member 12 in its guided position in the space 13 between the two wall parts 14, 15, the spring elements 16 have to be arranged subsequently as they would otherwise block the entrance into the space 13. In order to retain the tensioning profile member 12 in a release position before tensioning the flexible sheet 7, a number of holding brackets 42 are used to hold the tensioning profile member 12 in position as the spring elements 16 are inserted, as illustrated in Fig. 2. In this position of the tensioning profile member 12, the spring elements 16 have to be compressed substantially during insertion, thereby complicating assembly. Furthermore, in the tensioned state of the flexible sheet 7, the tensioning profile member 12 is located at least partly inside the space 13 formed between the two wall parts 14, 15. As a consequence, it may be challenging to get hold on the tensioning profile member 12 in order to release the tension of the tensioning profile member 12 on the flexible sheet 7 and subsequently detach the edge 11 of the flexible sheet 7, for example in the case that the flexible sheet 7 needs washing.

[0032] Figs. 13 and 14 illustrate a building panel 1 according to the present invention. The building panel 1 is adapted to be mounted at a not shown ceiling or wall of a room so that a framework 2 of the building panel 1 has a room-facing side 3 and a building-facing side 4. The framework 2 includes a peripheral frame 5 formed by frame profile members 6. As illustrated in Fig. 8, a flexible sheet 7, such as a web, fabric, textile, foil or the like, is extended in a tensioned state over the room-facing side 3 of the framework 2 between the frame profile members 6. Each frame profile member 6 forms a, preferably rounded, outer edge 8 connecting a room-facing side 9 of the frame profile member 6 with a building-facing side 10 of the frame profile member 6. The flexible sheet 7 is bent about the outer edges 8 of the frame profile members 6, and respective edges 11 of the flexible sheet 7 are fixed to the building-facing side 10 of corresponding frame profile members 6 by means of tensioning profile members 12. Each frame profile member 6 forms a space 13 between two wall parts 14, 15, and a corresponding tensioning profile member 12 is guided between the two wall parts 14, 15 and spring-biased by a number of spring elements 16 for displacement in a tensioning direction D T directed away from the outer edge 8 of the frame profile member 6 for bringing the flexible sheet 7 into the tensioned state. Thereby, a force of the tensioned flexible sheet 7 balances a resilient force of the spring elements 16 arranged in the space 13.The outer edge 8 of said frame profile member 6 is formed by a connection 17 between the two wall parts 14, 15, and said number of spring elements 16 are arranged in the space 13 of said frame profile member 6 between said connection 17 and the corresponding tensioning profile member 12. As seen, in the illustrated embodiment, the connection 17 between the two wall parts 14, 15 forms a continuation of the two wall parts 14, 15 and closes the space 13 of said frame profile member 6 at the outer edge 8 thereof.

[0033] In this way, as illustrated in Fig. 4, the spring elements 16 may in their relaxed, uncompressed state easily be inserted into the space 13 between the two wall parts 14, 15 of the frame profile member 6, and subsequently, as illustrated in Fig. 5, the tensioning profile member 12 may simply be pressed into said space 13 in a guided configuration whereby the spring elements 16 may be compressed by the displacement of the tensioning profile member 12. By holding the tensioning profile member 12 in a slightly retracted position, in which the spring elements 16 are in a tensioned state, as illustrated in Fig. 6, an edge 11 of the flexible sheet 7 may be attached to the tensioning profile member 12, as illustrated in Fig. 7, and subsequently, the tensioning profile member 12 may be released, whereupon the spring elements 16 will cause the tensioning profile member 12 to slide in the tensioning direction D T away from the outer edge 8 of the frame profile member 6 so that the flexible sheet 7 is brought into its tensioned state, as illustrated in Fig. 8. Furthermore, in the case that the flexible sheet 7 needs washing or replacement, the tension of the tensioning profile member 12 on the flexible sheet 7 may easily be released by simply pressing the tensioning profile member 12 further into said space 13, against the tensioning direction D T thereof. Subsequently, the flexible sheet 7 may easily be disconnected from the tensioning profile member 12.

[0034] In the building panel 1 according to the present invention, the frame profile members 6 as well as the tensioning profile members 12 may for instance by made by extrusion of aluminium or any other suitably material. However, alternatively, each frame profile member 6 may advantageously be formed by bending or roll forming a piece of sheet metal, such as a steel plate, whereby the outer edge 8 of the frame profile member 6 may be formed as a, preferably rounded, bent connection between the two wall parts 14, 15 which would in this case be formed of the sheet metal. In this way, the frame profile members 6 could be bent or roll formed from sheet metal in an economic way, because the sheet metal would only have to be bent a few times in order to form the required cross-section of the frame profile members. Therefore, the amount of material used could be minimised. Comparing the cross-sectional view of Fig. 5 illustrating an embodiment of the present invention with the cross-sectional view of Fig. 1 illustrating a prior art solution, it is evident that the frame profile member 6 according to the present invention is better suited for roll forming when considering the formation of the space 13 between the first wall part 14 and the second wall part 15. In this connection, in particular, it has to be considered that the outer edge 8 of the frame profile member 6 has to be formed in both cases. Therefore, it would be a relatively more complex task roll forming the frame profile member 6 of the prior art solution illustrated in Fig. 1 as compared to roll forming the frame profile member 6 according to the present invention.

[0035] Referring to Fig. 9 illustrating a cross-sectional view of an embodiment of the frame profile member 6 according to the present invention, it is understood that some parts of this cross-section would require modifications in order to be able to roll form the profile. For example, it is seen that the first wall part 14 forms a generally triangular cavity 46 which strengthens the profile in that a partial double wall is created. The first wall part 14 generally extends at an oblique and acute angle in relation to a general plane of the building panel 1, said general plane extending in parallel to the extended flexible sheet 7. Furthermore, it is seen that on either side of the cavity 46, the outer faces of the first wall part 14 form an acute angle with each other. Such cavity 46 could in practice not be formed in a roll forming process, and therefore the first wall part 14 would have to be strengthened, if necessary, in other ways which will be well-known to persons skilled in the art of roll forming.

[0036] In the illustrated embodiment, a first part 18 of each spring element 16 abuts the connection 17 between the two wall parts 14, 15 of a corresponding frame profile member 6. Thereby, by arranging the first part 18 of each spring element 16 close to the outer edge 8 of the frame profile member 6, a suitable spring force may be obtained in a compact construction of the frame profile members 6.

[0037] In the illustrated embodiment, a second part 19 of each spring element 16 engages a longitudinal groove 20 of the corresponding tensioning profile member 12. Thereby, correct positioning of the second part 19 of each spring element 16 in relation to the corresponding tensioning profile member 12 may be ensured, because the spring element 16 may locate itself in the longitudinal groove 20 of the corresponding tensioning profile member 12 when the tensioning profile member is inserted into the space 13 between two wall parts 14, 15 of the corresponding frame profile member 6.

[0038] In the illustrated embodiment, as seen in Fig. 11, the longitudinal groove 20 of the tensioning profile member 12 is formed between two opposed flanges 21, 22 of the tensioning profile member 12, and outer faces 23, 24 of the opposed flanges 21, 22 are arranged to slide along respective inner faces 25, 26 of the two wall parts 14, 15 of the frame profile member 6 as illustrated in Figs. 9 and 10.

[0039] In the illustrated embodiment, as seen in Figs. 7, 8 and 11, each tensioning profile member 12 includes a sliding part 27 which is guided between the two wall parts 14, 15 of the frame profile member 6 and a flexible sheet attachment part 28 to which an edge 11 of the flexible sheet 7 is fixed.

[0040] In the illustrated embodiment, said flexible sheet attachment part 28 is located outside the space 13 formed between the two wall parts 14, 15. Thereby, attachment of the edge 11 of the flexible sheet 7 to the tensioning profile member 12 may be facilitated in that the tensioning profile member may be arranged with its sliding part 27 guided between the two wall parts 14, 15 of the frame profile member 6 before the flexible sheet 7 is attached to the flexible sheet attachment part 28 of the tensioning profile member 12. Furthermore, because the flexible sheet attachment part 28 is located outside the space 13 formed between the two wall parts 14, 15, the flexible sheet attachment part 28 may have a suitable size, i.e. a width larger than the width of the space 13 formed between the two wall parts 14, 15. Thereby, easy and strong attachment of the flexible sheet 7 to the tensioning profile member 12 may be facilitated. Removal of the flexible sheet 7 from the tensioning profile member 12 may also be facilitated, which may be practical, for instance in the case that the flexible sheet 7 needs washing.

[0041] In an embodiment of the building panel according to the present invention, each tensioning profile member 12 is displaceable in the tensioning direction D T in relation to the corresponding frame profile member 6 from a flexible sheet attachment position, which is illustrated in Figs. 6 and 7, in which the tensioning profile member 12 is releasably retained by the frame profile member 6 to a flexible sheet tensioning position, which is illustrated in Fig. 8, in which the flexible sheet 7 is in the tensioned state. Thereby, the tensioning profile member 12 may be fixed in a retracted state as seen in Figs. 6 and 7 in the flexible sheet attachment position, in which the spring elements 16 are in a tensioned state, and whereby an edge 11 of the flexible sheet 7 may be attached to the tensioning profile member 12 in a relaxed state of the flexible sheet 7 as seen in Fig. 7, and subsequently, the tensioning profile member 12 may be released from its retained position, whereupon the spring elements 16 will cause the tensioning profile member 12 to slide in the tensioning direction D T away from the flexible sheet attachment position to the flexible sheet tensioning position in which the flexible sheet 7 is tensioned as seen in Fig. 8. Because the tensioning profile member 12 may be retained temporarily in the flexible sheet attachment position, the attachment of the flexible sheet 7 to the tensioning profile member 12 may be greatly facilitated, as the flexible sheet 7 may easily be attached to the tensioning profile member 12 in a relaxed state of the flexible sheet 7 without the user having to press the tensioning profile member 12 against the spring force during attachment.

[0042] In the embodiment illustrated, as seen in Figs. 6 and 7, the tensioning profile member 12 is releasably retained in the flexible sheet attachment position by engagement between a protrusion 29 of the tensioning profile member 12 and a corresponding recess 30 of the frame profile member 6. Thereby, the tensioning profile member 12 may easily be released from its retained state in the flexible sheet attachment position by simply tilting the tensioning profile member 12 slightly in relation to the frame profile member 12 so that the corresponding protrusion 29 and recess 30 may disengage from each other.

[0043] As seen in Fig. 11, in the embodiment illustrated, said protrusion 29 or said recess of the tensioning profile member 12 is arranged at the flexible sheet attachment part 28. Thereby, both the flexible sheet attachment part 28 and said protrusion 29 may be arranged easily accessible outside the space 13 formed between the two wall parts 14, 15, thereby facilitating both attachment of the flexible sheet 7 to the tensioning profile member 12 and disengagement of the tensioning profile member 12 from its flexible sheet attachment position in relation to the frame profile member 6 as seen in Fig. 7.

[0044] In the embodiment illustrated, the flexible sheet attachment part 28 of the tensioning profile member 12 forms a longitudinal channel 31 with which a corresponding edge 11 of the flexible sheet 7 is releasably connected, and the longitudinal channel 31 is formed by a bottom wall part 32, a first side wall part 33 and a second side wall part 34. The bottom wall part 32 forms said protrusion 29 of the tensioning profile member 12.

[0045] In the embodiment illustrated, each edge 11 of the flexible sheet 7 is provided with a number of mutually spaced holding elements 41 arranged flexibly in relation to each other along the edge 11 of the flexible sheet 7. Each holding element 41 is adapted for insertion into the longitudinal channel 31 in a lateral insertion direction of the channel, through an opening slot of the channel formed between a flange 35 of the first side wall part 33 and the second side wall part 34. As seen, each holding element 41 is, in its final inserted position in the longitudinal channel 31, prevented from free rotation about any longitudinal axis of the channel 31 of the tensioning profile member 12.

[0046] Each holding element 41 may have the form of a metal element gripping over a respective edge 11 of the flexible sheet 7 or the edge of a not shown ribbon attached to said edge 11 of the flexible sheet 7 in the illustrated embodiments. Said ribbon with the attached holding elements 41 may advantageously have the form of one of the two corresponding zipper tapes of a conventional zipper which are provided with zipper teeth.

[0047] However, alternatively, the edge 11 of the flexible sheet 7 may be attached in a way known per se in a toothed notch, i.e. a toothed version of the longitudinal channel 31, of the tensioning profile member 12 by means of a keder, a coiled spring or the like which pinches the edge 11 of the flexible sheet 7 in said toothed notch. However, according to the present invention, the edge 1 of the flexible sheet 7 may be attached to the tensioning profile member 12 in any other suitable way.

[0048] In the illustrated embodiment, the tensioning profile member 12 is releasable from the flexible sheet attachment position by elastic deformation of the tensioning profile member 12 and / or of the frame profile member 6. Thereby, the tensioning profile member 12 may be even better fixed in the flexible sheet attachment position as seen in Figs. 6 and 7 during attachment of the flexible sheet 7 to the tensioning profile member 12, and at the same time easy disengagement of the tensioning profile member 12 from the flexible sheet attachment position may be possible by slightly tilting the tensioning profile member 12 in relation to the frame profile member 6 so that the corresponding protrusion 29 and recess 30 may disengage from each other as a result of said elastic deformation of the tensioning profile member 12 and / or of the frame profile member 6. As illustrated in Fig. 7, this may be done by inserting a tool 36 between the tensioning profile member 12 and a part 37 of the corresponding frame profile member 6 and twisting the tool 36 at least slightly, thereby at least slightly flexing the tensioning profile member 12 and / or the frame profile member 6 so that the protrusion 29 is lifted out of the recess 30. As seen, the tool 36 may suitably have the form of a miniature crowbar.

[0049] In the flexible sheet attachment position as illustrated in Fig. 7, in order to facilitate insertion of the tool 36 between the tensioning profile member 12 and said part 37 of the corresponding frame profile member 6, a space 43 is formed between the flexible sheet attachment part 28 and the frame profile member 6 as indicated in Fig. 6. Said space 43 is in the illustrated embodiment formed partly by a recess 44 of the tensioning profile member 12 formed next to the protrusion 29, as indicated in Fig. 11, and an additional recess 45 of the frame profile member 6 formed next to the recess 30, as indicated in Fig. 10. As seen, in the illustrated embodiment, the additional recess 45 of the frame profile member 6 and the recess 30 are formed outside the space 13 between the two wall parts 14, 15.

[0050] Fig. 9 illustrates a cross-sectional view of a frame profile member 10 of a building panel 1 according to the present invention, before assembly of the building panel. In particular, it is noted that the frame profile member 10 is provided with a flange 38 connected to the rest of the frame profile member 10 by means of a thin-walled joint 39. The frame profile member 10 has been extruded and possibly surface treated and / or painted together with this flange 38. Before assembly of the building panel 1, the thin-walled joint 39 is broken so that the flange 38 may constitute a separate element. During assembly of the building panel 1, a number of absorber elements 40 in the form of thick plates are arranged within the peripheral frame 5 formed by the frame profile members 6 of the building panel 1 as seen for instance in Figs. 3 and 13, and the broken off flanges 38 are arranged to engage an upper groove 47 of the respective frame profile members 6 in order to hold the absorber elements 40 in place, as seen in Fig. 3, against a lower flange 86 of the frame profile member 6. As seen, the edges formed by breakage of the thin-walled joint 39 are hidden in the building panel 1 during use.

[0051] As illustrated in Figs. 13 and 15 to 18, neighbouring frame profile members 6 are connected to each other at respective corners 57 of the building panel 1. Each corner 57 has a slot 56 formed between opposed parts of the corner 57 and extending at an oblique angle in relation to each one of the neighbouring frame profile members 6. Excess flexible sheet 58 at a respective corner 57 of the building panel 1 is inserted into the slot 56 of the corner 57, and a resilient member 59 is arranged to, at least temporarily, retain the excess flexible sheet 58.

[0052] As seen particularly well in Figs. 15 and 16, each corner 57 forms an internal cavity 53 extending laterally from either side of at least part of the length of the slot 56 of the corner 57 behind opposed wall parts 54, 55 of the corner 57 arranged at either side of the slot 56. Comparing with Figs. 8 and 14, it is understood that each one of the opposed wall parts 54, 55 of the corner 57 extends at an oblique angle in relation to the general plane of the building panel 1, said general plane, as mentioned above, extending in parallel to the extended flexible sheet 7. The resilient member 59 is attached to the corner 57 and extends at either side of the slot 56 in the internal cavity 53 of the corner 57 of the building panel 1. As understood from Figs. 16 to 18, the resilient member 59 is adapted to retain at least part of the excess flexible sheet 58 at either side of the slot 56 in the internal cavity 53 of the corner 57 of the building panel 1. In the illustrated embodiment, the resilient member 59 is adapted to pinch the at least part of the excess flexible sheet 58 at either side of the slot 56 between the resilient member 59 and an upper face of the internal cavity 53 of the corner 57.

[0053] By attaching the resilient member 59 to the corner 57 and adapting the resilient member 57 to retain at least part of the excess flexible sheet 58 at either side of the slot 56 in the internal cavity 53 of the corner of the building panel 1, it may be possible taking up and retaining, at least a major part of the excess flexible sheet 58 at the corner, thereby ensuring a smooth finish of the flexible sheet 7 and further allowing easy removal and subsequent refitting of the tensioned flexible sheet 7.

[0054] As seen in Figs. 13 and 15 to 18, in the illustrated embodiment, neighbouring frame profile members 6 are connected to each other by means of corner pieces 48 forming the respective corners of the building panel 1. Each corner piece 48 is provided with connection studs 49 for insertion into corresponding cavities 50 of the neighbouring frame profile members 6, and the corner pieces 48 are provided with screw holes 51 for insertion of connection screws 52 which are threaded into the neighbouring frame profile members 6. As seen in Fig. 16, a face of the studs 49 is rounded so that it matches a rounded internal form of the cavities 50. Each corner piece 48 forms an internal cavity 53 of the respective corner of the building panel 1, and each corner piece 48 forms the opposed wall parts 54, 55 of the corner and the slot 56 between the opposed wall parts 54, 55. Thereby assembly of the building panel 1 may be facilitated and an accurate finish of each corner may be ensured. However, in an alternative not shown embodiment, neighbouring frame profile members 6 are connected to each other by means of a mitre joint in a well-known manner.

[0055] It is noted that Figs. 3 to 8 illustrate a cross-section of one of the frame profile members 6 of a building panel 1 according to the present invention, wherein a corresponding corner piece 48 connected to said frame profile member 6 is partly visible. However, a second frame profile member 6 to be connected to said corner piece 48 is not illustrated, thereby causing a stud 49 of said corner piece 48 to be visible in Fig. 3.

[0056] As seen in Fig. 18, in the embodiment illustrated, a cover plate 60 is fixed at the slot 56, thereby pinching the flexible sheet 7 between the cover plate 60 and edges 61, 62 of the slot 56 formed by either one of the opposed wall parts 54, 55 of the corner 57. Thereby, an even stronger holding force may be applied permanently on the flexible sheet 7, and the resilient member 59 may in this case serve to temporarily hold the flexible sheet 7 in place during fitting of the flexible sheet 7 on the building panel 1 at either side of the slot 56.

[0057] In the embodiment illustrated, the cover plate 60 is fixed at the slot 56 by means of a screw 63 inserted through the cover plate 60 and engaging a stud 64 arranged in the slot 56 of the corner 57, and the stud 64 extends through the resilient member 59.

[0058] In the embodiment illustrated, the internal cavity 53 of each corner 57 of the building panel 1 forms a continuation of the spaces 13 formed between the two wall parts 14, 15 of the neighbouring frame profile members 6 of the respective corner 57. Because a certain depth of the spaces 13 formed between the two wall parts 14, 15 is required for the guidance of the tensioning profile member 12, the internal cavity 53 of each corner 57 of the building panel 1 may therefore have a corresponding certain depth which in turn may allow for even better possibility of taking up and retaining a major part of the excess flexible sheet 58 at the corner 57. This is in particular true when comparing with the prior art building panel of Figs. 1 and 2, in which the rounded outer edge 8 of the frame profile members 6 leaves very little space for a corner piece to take up and retain excess flexible sheet at the corner.

[0059] As seen, a rounded outer edge 65 of each corner piece 48 forms a continuation of the, preferably rounded, outer edge 8 of the neighbouring frame profile members 6 of the respective corner 57. The rounded outer edge 65 of each corner piece 48 forms a connection between the respective opposed wall parts 54, 55 of the corner piece 48 and a bottom wall 66 of the corner piece 48.

[0060] Referring to Figs. 13 and 19, it is seen that the frame profile member 6 according to the present invention is provided with a mounting channel 67 for attachment of various suspension fittings for mounting the building panel 1 under a ceiling or at a wall.

[0061] Comparing the cross-sectional view of Fig. 8 illustrating an embodiment of the present invention with the cross-sectional view of Fig. 1 illustrating a prior art solution, it is seen that whereas the prior art solution is provided with a mounting channel 67 opening towards the building-facing side 4 of the framework of the building panel, i.e. directed at right angles to the general plane of the building panel, the embodiment of the building panel 1 according to the present invention is provided with a mounting channel 67 opening in a sideways direction, towards a peripheral side 68 of the framework 2 of the building panel 1, i.e. directed in a direction of the general plane of the building panel 1. This sideways orientation of the mounting channel 67 of the inventive embodiment has been made possible by the different arrangement of the space 13 between the two wall parts 14, 15 of the frame profile member 6 as compared with the prior art building panel of Fig. 1. In the inventive embodiment, said space 13 has so to say been moved further away from the absorber element 40 as compared with the prior art solution, thereby creating more room above the tensioning profile member 12 when oriented as seen in Fig. 8. Consequently, it has been possible to arrange different suspension fittings just above and close to the tensioning profile member 12 as seen in Fig. 19, and therefore, the sideways open mounting channel 67 has been made possible.

[0062] The sideways open mounting channel 67 is in particular advantageous in that mounting screws 69 of different suspension fittings may be accessible even when the building panel 1 is mounted below a ceiling or at a wall. Thereby, the positioning of such mounting fittings along the longitudinal direction of the frame profile members 6 may easily be adjusted without having to remove the entire building panel 1 from the ceiling or wall. For instance, Figs. 19 and 21 illustrate a well-known torsion spring fitting 70 having a base bracket 85 and clamping elements 71 adapted to be clamped into tracks 72 arranged at either side of the mounting channel 67 in that mounting screws 69 threaded into the clamping elements 71 may be tightened. The torsion spring fitting 70 is provided with legs having hooks 73 adapted to grip into holes, for instance of overhanging rails (not shown).

[0063] It is noted that the upper track 72 of the mounting channel 67 as seen in Fig. 9 may also serve as a cavity for a connection stud 49 of a corner piece 48 when connecting the corner piece 48 with a frame profile member 6 as discussed above.

[0064] Furthermore, Figs. 19 and 20 illustrate a new and in itself inventive spring-biased releasable fitting 74 including a fixed bracket 75 adapted to be mounted to for instance overhanging rails by means of not shown screws and including a swinging bracket 76 rotatable about a hinge axis 77 in relation to the fixed bracket 75. The swinging bracket 76 has a bent part 78 extending through an opening 79 of the fixed bracket 75 in a mounting position of the spring-biased releasable fitting 74. In the mounting position, the bent part 78 may engage the sideways open mounting channel 67 of a frame profile member 6 of the building panel 1 as illustrated in Fig. 19, thereby holding the building panel 1 in its mounted position. At an oppositely arranged frame profile member 6 of the building panel 1, an in itself well-known, not shown, hinge may hold the building panel 1 so that when the spring-biased releasable fitting 74 is released, the building panel 1 may swing to a hanging down orientation. The spring-biased releasable fitting 74 may be released by pressing a bent-up flap 81 in a downward direction, so that the swinging bracket 76 swings in the rotating direction R indicated in Fig. 20 about the hinge axis 77, against the bias of a flat spring 80 arranged so that it engages the fixed bracket 75 and the swinging bracket 76, thereby causing the bent part 78 to disengage the sideways open mounting channel 67 of the frame profile member 6.

[0065] Furthermore, Figs. 13 and 19, for illustrative purposes, show some well-known suspension fittings in the form of a magnetic holder 82, a push latch 83 and a wire holder 81. Naturally, typically only one or a few different types of these suspension fittings are used on the same building panel 1.

[0066] The present invention further relates to a method of manufacturing a building panel 1 as described above. The method includes the steps of arranging a corresponding tensioning profile member 12 in guided configuration between the two wall parts 14, 15 of each frame profile member 6 so that is it spring-biased by a number of spring elements 16 for displacement in a tensioning direction D T directed away from the outer edge 8 of the frame profile member 6 for bringing the flexible sheet 7 into a tensioned state, extending the flexible sheet 7 over the room-facing side 3 of the framework 2 between the frame profile members 6, bending the flexible sheet 7 about the outer edges 8 of the frame profile members 6, fixing edges of the flexible sheet 7 to the building-facing side 10 of respective frame profile members 6 by means of the tensioning profile members 12, and tensioning the flexible sheet 7 by displacement of each tensioning profile member 12 in its corresponding tensioning direction D T .

[0067] The method according to the invention is characterised by performing the following steps in the mentioned order: arranging said number of spring elements 16 in the space 13 of said frame profile member 6, as seen in Fig. 4, pressing a corresponding tensioning profile member 12 into the space 13 against the spring-bias of the spring elements 16 and against the tensioning direction D T , as seen in Fig. 5, connecting the flexible sheet 7 to the tensioning profile member 12, as seen in Fig. 7, and displacing, by means of the spring-bias of the spring elements 16, the tensioning profile member 12 in a direction out of the space 13 and in the tensioning direction D T until the flexible sheet 7 is brought into its tensioned state, as seen in Fig. 8.

[0068] In an embodiment, the method includes the step of, before connecting the flexible sheet 7 to the tensioning profile member 12, as seen in Fig. 7, releasably retaining the tensioning profile member 12 in a flexible sheet attachment position in relation to the frame profile member 6, as seen in Fig. 6, and the step of, after connecting the flexible sheet 7 to the tensioning profile member 12, releasing the tensioning profile member 12 from the flexible sheet attachment position in relation to the frame profile member 6, as seen in Fig. 8.

[0069] Alternatively, the tensioning profile member 12 may be held in the flexible sheet attachment position by hand during connection of the flexible sheet 7 to the tensioning profile member 12. However, releasably retaining the tensioning profile member 12 in the flexible sheet attachment position in relation to the frame profile member 6 greatly facilitates the operation of assembling the building panel 1.

[0070] In an embodiment, the tensioning profile member 12 is being released from the flexible sheet attachment position in relation to the frame profile member 6 by inserting a tool 36 between the tensioning profile member 12 and a part 37 of the corresponding frame profile member 6 and twisting the tool 36 at least slightly, as indicated in Fig. 7, thereby at least slightly flexing the tensioning profile member 12 and / or the frame profile member 6.List of reference numbers

[0071] D T tensioning direction Rrotating direction of swinging bracket 1building panel 2framework of building panel 3room-facing side of framework 4building-facing side of framework 5peripheral frame of framework 6frame profile member 7flexible sheet 8outer edge of frame profile member 9room-facing side of frame profile member 10building-facing side of frame profile member 11edge of flexible sheet 12tensioning profile member 13space between wall parts 14first wall part 15second wall part 16spring element 17connection between two wall parts 18first part of spring element 19second part of spring element 20longitudinal groove of tensioning profile member 21first flange of tensioning profile member 22second flange of tensioning profile member 23outer face of first flange of tensioning profile member 24outer face of second flange of tensioning profile member 25inner face of first wall part 26inner face of second wall part 27sliding part of tensioning profile member 28flexible sheet attachment part of tensioning profile member 29protrusion of tensioning profile member 30recess of frame profile member 31longitudinal channel of flexible sheet attachment part 32bottom wall part of longitudinal channel 33first side wall part of longitudinal channel 34second side wall part of longitudinal channel 35flange of first side wall part 36tool 37part of frame profile member 38flange for holding absorber element 39thin-walled joint 40absorber element 41holding element of edge of flexible sheet 42holding bracket for prior art tensioning profile member 43space for insertion of tool 44recess of tensioning profile member 45additional recess of frame profile member 46cavity of first wall part 47upper groove of frame profile member 48corner piece 49connection stud of corner piece 50cavity of frame profile member 51screw hole of corner piece 52connection screw 53internal cavity of corner 54, 55opposed wall parts of corner piece 56slot between opposed wall parts of corner piece 57corner of building panel 58excess flexible sheet 59resilient member 60cover plate 61, 62edges of slot 63screw 64stud 65rounded outer edge 66bottom wall of corner piece 67mounting channel for suspension fittings 68peripheral side of framework 69mounting screw of suspension fitting 70torsion spring fitting 71clamping element of torsion spring fitting 72track of mounting channel 73hook of torsion spring fitting 74spring-biased releasable fitting 75fixed bracket of spring-biased releasable fitting 76swinging bracket of spring-biased releasable fitting 77hinge axis 77 of spring-biased releasable fitting 78bent part of swinging bracket 79opening of fixed bracket 80flat spring 81bent-up flap of swinging bracket 82magnetic holder 83push latch 84wire holder 85base bracket of torsion spring fitting 86lower flange of frame profile member

Claims

1. A building panel (1) adapted to be mounted at a ceiling or wall of a room so that a framework (2) of the building panel (1) has a room-facing side (3) and a building-facing side (4), wherein the framework (2) includes a peripheral frame (5) formed by frame profile members (6), wherein a flexible sheet (7), such as a textile or foil, is extended in a tensioned state over the room-facing side (3) of the framework (2) between the frame profile members (6), wherein each frame profile member (6) forms an outer edge (8) connecting a room-facing side (9) of the frame profile member (6) with a building-facing side (10) of the frame profile member (6), wherein the flexible sheet (7) is bent about the outer edges (8) of the frame profile members (6), wherein edges (11) of the flexible sheet (7) are fixed to the building-facing side (10) of respective frame profile members (6) by means of tensioning profile members (12), wherein each frame profile member (6) forms a space (13) between two wall parts (14, 15), wherein a corresponding tensioning profile member (12) is guided between the two wall parts (14, 15) and spring-biased by a number of spring elements (16) for displacement in a tensioning direction (DT) directed away from the outer edge (8) of the frame profile member (6) for bringing the flexible sheet (7) into the tensioned state, characterised in that the outer edge (8) of said frame profile member (6) is formed by a connection (17) between the two wall parts (14, 15), and in that said number of spring elements (16) are arranged in the space (13) of said frame profile member (6) between said connection (17) and the corresponding tensioning profile member (12).

2. A building panel according to claim 1, wherein a first part (18) of each spring element (16) abuts the connection (17) between the two wall parts (14, 15) of a corresponding frame profile member (6).

3. A building panel according to claim 1 or 2, wherein a second part (19) of each spring element (16) engages a longitudinal groove (20) of the corresponding tensioning profile member (12).

4. A building panel according to claim 3, wherein the longitudinal groove (20) of the tensioning profile member (12) is formed between two opposed flanges (21, 22) of the tensioning profile member (12), and wherein outer faces (23, 24) of the opposed flanges (21, 22) are arranged to slide along respective inner faces (25, 26) of the two wall parts (14, 15) of the frame profile member (6).

5. A building panel according to any one of the preceding claims, wherein each tensioning profile member (12) includes a sliding part (27) which is guided between the two wall parts (14, 15) of the frame profile member (6) and a flexible sheet attachment part (28) to which an edge (11) of the flexible sheet (7) is fixed.

6. A building panel according to claim 5, wherein said flexible sheet attachment part (28) is located outside the space (13) formed between the two wall parts (14, 15).

7. A building panel according to any one of the preceding claims, wherein each tensioning profile member (12) is displaceable in the tensioning direction (DT) in relation to the corresponding frame profile member (6) from a flexible sheet attachment position in which the tensioning profile member (12) is releasably retained in relation to the frame profile member (6) to a flexible sheet tensioning position in which the flexible sheet (7) is in the tensioned state.

8. A building panel according to claim 7, wherein the tensioning profile member (12) is releasably retained in the flexible sheet attachment position by engagement between the tensioning profile member (12) and the frame profile member (6).

9. A building panel according to claim 7 or 8, wherein the tensioning profile member (12) is releasably retained in the flexible sheet attachment position by engagement between a protrusion (29) or a recess of the tensioning profile member (12) and a corresponding protrusion or recess (30) of the frame profile member (6).

10. A building panel according to claim 6 and 9, wherein said protrusion (29) or said recess of the tensioning profile member (12) is arranged at the flexible sheet attachment part (28).

11. A building panel according to claim 10, wherein the flexible sheet attachment part (28) of the tensioning profile member (12) forms a longitudinal channel (31) with which a corresponding edge (11) of the flexible sheet (7) is releasably connected, wherein the longitudinal channel (31) is formed by at least one wall part (32), and wherein said wall part (32) forms said protrusion (29) or said recess of the tensioning profile member (12).

12. A building panel according to any one of the claims 7 to 11, wherein the tensioning profile member (12) is releasable from the flexible sheet attachment position by elastic deformation of the tensioning profile member (12) and / or of the frame profile member (6).

13. A method of manufacturing a building panel (1) adapted to be mounted at a ceiling or wall of a room so that a framework (2) of the building panel (1) has a room-facing side (3) and a building-facing side (4), wherein the framework (2) includes a peripheral frame (5) formed by frame profile members (6), wherein each frame profile member (6) forms an outer edge (8) connecting a room-facing side (9) of the frame profile member (6) with a building-facing side (10) of the frame profile member (6), wherein each frame profile member (6) forms a space (13) between two wall parts (14, 15) for guidance of a corresponding tensioning profile member (12) between the two wall parts (14, 15), and wherein the method includes the steps of arranging a corresponding tensioning profile member (12) in guided configuration between the two wall parts (14, 15) of each frame profile member (6) so that is it spring-biased by a number of spring elements (16) for displacement in a tensioning direction (DT) directed away from the outer edge (8) of the frame profile member (6) for bringing a flexible sheet (7), such as a textile or foil, into a tensioned state, extending the flexible sheet (7) or foil over the room-facing side (3) of the framework (2) between the frame profile members (6), bending the flexible sheet (7) about the outer edges (8) of the frame profile members (6), fixing edges of the flexible sheet (7) to the building-facing side (10) of respective frame profile members (6) by means of the tensioning profile members (12), and tensioning the flexible sheet (7) by displacement of each tensioning profile member (12) in its corresponding tensioning direction (DT), characterised by performing the following steps in the mentioned order: arranging said number of spring elements (16) in the space (13) of said frame profile member (6), pressing a corresponding tensioning profile member (12) into the space (13) against the spring-bias of the spring elements (16) and against the tensioning direction (DT), connecting the flexible sheet (7) to the tensioning profile member (12), and displacing, by means of the spring-bias of the spring elements (16), the tensioning profile member (12) in a direction out of the space (13) and in the tensioning direction (DT) until the flexible sheet (7) is brought into its tensioned state.

14. A method of manufacturing a building panel according to claim 13, whereby the method includes the step of, before connecting the flexible sheet (7) to the tensioning profile member (12), releasably retaining the tensioning profile member (12) in a flexible sheet attachment position in relation to the frame profile member (6), and the step of, after connecting the flexible sheet (7) to the tensioning profile member (12), releasing the tensioning profile member (12) from the flexible sheet attachment position in relation to the frame profile member (6).

15. A method of manufacturing a building panel according to claim 13 or 14, whereby the tensioning profile member (12) is being released from the flexible sheet attachment position in relation to the frame profile member (6) by inserting a tool (36) between the tensioning profile member (12) and a part (37) of the corresponding frame profile member (6) and twisting the tool (36) at least slightly, thereby at least slightly flexing the tensioning profile member (12) and / or the frame profile member (6).

Images