EP2562323B1 - A suspended ceiling and a method for providing a profile for a suspended ceiling - Google Patents
A suspended ceiling and a method for providing a profile for a suspended ceiling Download PDFInfo
- Publication number
- EP2562323B1 EP2562323B1 EP11179024.2A EP11179024A EP2562323B1 EP 2562323 B1 EP2562323 B1 EP 2562323B1 EP 11179024 A EP11179024 A EP 11179024A EP 2562323 B1 EP2562323 B1 EP 2562323B1
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- European Patent Office
- Prior art keywords
- profile
- suspended
- ceiling
- deflection
- suspended ceiling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000011491 glass wool Substances 0.000 description 2
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Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/06—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members
- E04B9/065—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members comprising supporting beams having a folded cross-section
- E04B9/067—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members comprising supporting beams having a folded cross-section with inverted T-shaped cross-section
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/06—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members
- E04B9/061—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members supporting construction for curved ceilings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/06—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members
- E04B9/065—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members comprising supporting beams having a folded cross-section
- E04B9/067—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members comprising supporting beams having a folded cross-section with inverted T-shaped cross-section
- E04B9/068—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members comprising supporting beams having a folded cross-section with inverted T-shaped cross-section with double web
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/18—Means for suspending the supporting construction
- E04B9/20—Means for suspending the supporting construction adjustable
- E04B9/205—Means for suspending the supporting construction adjustable by means of a resilient clip
Definitions
- a further object is to provide a suspended ceiling including a profile which withstands deflection better compared to the prior art solutions.
- the deflection of said at least one profile in the loaded condition is less than the distance between two adjacent suspension points of said at least one profile divided by a factor of 500.
- the deflection of said at least one profile in the loaded condition is less than the distance between two adjacent suspension points of said at least one profile divided by a factor of 500.
- the ceiling tiles 5 may be made of man-made mineral fibre, such as a compressed mineral fibre material. More specifically, the mineral fibre material may be mineral wool, especially glass wool. In addition to the mineral fibre material, the ceiling tiles 5 comprise a binder. The ceiling tiles 5 may further comprise at least one surface layer.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Building Environments (AREA)
- Residential Or Office Buildings (AREA)
Description
- The present invention relates a suspended ceiling comprising a grid and at least one ceiling tile. The grid is formed of a plurality of profiles and is adapted to support said at least one ceiling tile, wherein each profile is adapted to be supported at at least two suspension points. The present invention also relates to a method for providing a profile for a suspended ceiling.
- Suspended ceilings can be installed in many different types of buildings for various reasons, for example to absorb sound, to reflect light, to lower the ceiling height or to conceal installations such as cable arrangements, ventilation equipment, lighting installations and other devices arranged in the space between the suspended ceiling and the ceiling structure of a building.
- A suspended ceiling usually comprises a plurality of ceiling tiles and a supporting structure in form of a grid. The grid comprises profiles which support the ceiling tiles. The grid often comprises main profiles which are suspended to the ceiling structure of the building and transverse or cross profiles which are supported by the main profiles. The profiles usually have an inverted T-shape. The ceiling tiles may have sound-absorbing and/or sound-insulation properties in order to improve the acoustic environment of the room. In order to obtain a relatively lightweight ceiling with satisfactory sound absorption, the tiles, for instance, may be made of a compressed fibre material such as mineral wool and especially glass wool. Reference is made to
US 2008/0155935 A1 that discloses a suspended ceiling according to the preamble ofclaim 1. In addition to ceiling tiles, the profiles may also support various equipments such as lightning devices, ventilation equipments, inspection openings, detectors, cable trays, loudspeakers, signs, sprinklers etc. - Consequently, the profiles are subjected to a load resulting from the weight of ceiling tiles or other equipment supported by the profile. A load on a profile causes deflection. The deflection is proportional to the load and strongly depends on the span between the points where the profile is supported. The deflection is also undesirable due to aesthetic reasons.
- The deflection is measured as the maximum distance between the profile and an imaginary straight line between adjacent suspension points when the profile is in its loaded condition.
- Various standards for suspended ceilings, for example EN 13964 include requirements on the maximum deflection allowed. EN 13964 allows a deflection (for instance measured in mm) not exceeding the distance the profile between the adjacent suspension points (for instance measured in mm) divided by 500 (for EN 13964 class 1), or for certain premises divided by 300 (EN 13964 class 2). However, the maximum deflection must be less or equal to 4,0 mm according to EN 13964
class 1. - One solution suggested in order to minimise the deflection of a loaded profile is to increase the bearing capacity of the profile. The profile may be strengthen in different ways, for example by increasing the material thickness of the profile, by adding stiffening grooves to the profile, or by adding a reinforcement bulb to a web of the profile. Another solution provided in the prior art in order to increase the torsional rigidity of the profile is to fold the profile such that the web has a layered structure and join different portions of the web of the profile by gluing, wedging or riveting. Examples of such solutions are found in
WO 2009/087378 and inEP 2 099 983 - However, adding extra material or performing additional steps in the manufacturing process of the profile increases the cost for manufacturing each profile.
- It is an object of the present invention to provide an improvement over the above described techniques and prior art.
- A further object is to provide a suspended ceiling including a profile which withstands deflection better compared to the prior art solutions.
- At least some of these and other objects and advantages that will be apparent from the description have been achieved by a suspended ceiling having the features of
claim 1. - The predetermined value may be a maximum allowed value according to any of existing or future standards.
- Preferably, the deflection of said at least one profile in the loaded condition is less than a distance between two adjacent suspension points of said at least one profile divided by a factor of 300.
- Preferably, the deflection of said at least one profile in the loaded condition is less than the distance between two adjacent suspension points of said at least one profile divided by a factor of 500.
- By an unloaded condition is meant a condition wherein the profile is unaffected by the force of gravity resulting from the own weight of the profile and from any additional load in a vertical direction.
- By a loaded condition is meant a condition wherein the profile is affected by the force of gravity resulting from the own weight of the profile and from any additional load in a vertical direction. The additional load may be both a uniformly distributed load and/or a point load.
- By suspension points are meant a point wherein the profile is suspended, for example suspended by another profile, suspended by a suspension means, for example a hanger, or directly to the ceiling structure of the building by means of a fastening means.
- By providing the profile with at least one curved portion extending between adjacent suspension points, the profile forms in its unloaded condition an upwardly curved line in the vertical direction, i.e. as seen in a plane perpendicular to the extension of the suspended ceiling. When a load is applied to the profile but also by the own weight of the profile, the profile is deformed by the load such that it extends more or less along a straight line, or is deflected such that the deflection is less than the distance between two adjacent suspension points of said at least one profile divided by a factor of 300. In some situations, if the load is light-weight compared to the rigidity of the profile, the profile may even remain slightly upwardly curved in the loaded direction. However, the requirement that the deflection is, for example, less than the distance between two adjacent suspension points of the profile divided by a factor of 300 is still fulfilled.
- Consequently, it is possible to calculate the curvature required in the unloaded condition such that the profile, in the loaded condition, extends such that the deflection is less than a predetermined value, for example the distance between two suspension points divided by a factor of 300. The curvature in the unloaded condition of the profile is calculated such that the deflection of the profile in the loaded condition of the profile is less than a maximum allowed value, for example the deflection is less than the distance between two suspension points divided by a factor of 300.
- By providing a profile with an upwardly curved portion between two suspension points in its unloaded condition, the profile can carry an increased load. For example, in the unloaded condition of the profile, the maximum distance in a vertical direction between an upwardly curved portion extending between two suspension points and an imaginary straight line extending between the suspension points is equal to the distance between the suspension points divided by 300. Thereby, the curved profile can carry a load being doubled compared to a conventionally straight profile until the maximum allowed deflection is reached according to various standards such as EN 13964, ASTM C635, BS 8290
part 2, DIN 18 168 and SS 81 51 13. By curving the profile even more, the curved profile can carry a load being more than doubled, still fulfilling the deflection requirement. - Consequently, the load that the profile can carry before reaching the maximum deflection allowed according to standards, for example EN 13964, is increased when using a profile having a curved portion compared to a conventional straight profile. A profile having an upwardly curved portion may therefore carry a larger load in form of more ceiling tiles, heavier ceiling tiles, more additional equipment etc, before an undesired deflection is obtained. As an example, by calculating the deflection which would occur if the profile would not be curved for a certain load, the profile may be curved such that the maximum distance in mm in the vertical direction between the curved portion in its unloaded condition and an imaginary straight line corresponds to the previous deflection. The profile may be even more curved in order to carry a larger load and still fulfil the deflection requirement.
- Further, it is possible to decrease the material thickness of the profile if the profile comprises at least one upwardly curved portion. Thereby, the cost of the profile can be decreased since the consumption of material for each profile is reduced. A conventional profile which is not curved having a decreased material thickness would result in a deflection exceeding the allowed deflection for a certain load. If the same profile is provided with at least one curved portion, the deflection would be below the allowed deflection if the same load is applied. If a certain dimension is required for a profile in order to avoid a too large deflection when a load is applied, it is possible to diminish the dimension if a profile having at least one curved portion is used instead.
- By reducing the deflection of profiles forming a suspended ceiling, a more aesthetically pleasing ceiling may be formed.
- A grid for supporting a suspended ceiling usually comprises main profiles which are suspended to the ceiling structure and transverse profiles being suspended by the main profiles. The ends of the transverse profile may be suspended by the main profiles such that the transverse profile is extending between at least two main profiles. If the profile having at least one upwardly curved portion is a transverse profile, the profile in its unloaded condition comprises an upwardly curved portion between the two adjacent suspension points. If the upwardly curved profile is a main profile, the main profile is curved such that it in its unloaded condition comprises at least one curved portion in the vertical direction between two adjacent suspension points.
- Furthermore, the grid supporting the suspended ceiling may comprise both conventional profiles and a profile or profiles having at least one upwardly curved portion. The profile having an upwardly curved portion may be both a main profile and a transverse profile. Alternatively, both types of profiles may comprise upwardly curved portions.
- Said at least one profile may be plastically and/or elastically deformed in its unloaded condition. The upwardly curved portion may be formed in alternative ways. The upwardly curved portion may be formed by plastically deforming the profile such that at least one curved portion is formed. Thereby, the profile is plastically deformed in its unloaded condition. Plastically deformation may be performed by a roll forming operation. Alternatively, the curved portion may be formed by elastically deforming the profile such that at least one curved portion is formed. Thereby, the profile is elastically deformed in its unloaded condition. Elastically deforming may be achieved by introducing an internal state of stress into the profile. As a further alternative, a combination is also possible. The curved portion may be formed by both plastically and elastically deformed such that at least one curved portion is formed. The profile may thus be both elastically and plastically deformed in its unloaded condition.
- Said at least one profile may be pre-stressed in its unloaded condition. The at least one upwardly curved portion may be formed by pre-stressing the profile. By pre-stressing the profile, the profile is elastically deformed such that at least one curved portion is formed. By pre-stressing the profile, an advantageous stress distribution is obtained. Tensile stress is formed at the upper parts of the profile due to the pre-stressing condition. The tensile stress improves the stability of the profile and reduces the risk of lateral-torsional buckling.
- An internal state of stress may also be introduced into the profile by fixing a profile having at least one curved portion directly to the ceiling structure of the building. As alternative to being directly fixed to the ceiling structure, a spacing member may be arranged between the profile and the ceiling structure. The profile is fixed to the ceiling such that the profile extends along a straight line, preferably parallel to the ceiling. As a consequence of the curved profile being forced into a straight extension, an internal state of stress is introduced into the profile and the profile is thereby pre-stressed. Thus, the profile may carry an increased load without reaching a critical deflection. Alternatively, if the load remains the same as for a conventional profile, the material thickness of the profile may be reduced without reaching maximum allowed deflection.
- Said at least one curved portion may be concavely curved in an upward direction in the unloaded condition of the profile as viewed from a side of the profile adapted to face the interior of a room when mounted in suspended ceiling. The curved portion is upwardly curved in a plane perpendicular to the plane of the suspended ceiling. When a load is applied to such a profile, the profile will deflect downwards such that it forms an essentially straight line, or deflects to a degree less than the allowed deflection defined in standards such as EN 13964.
- Said at least one profile in its loaded condition may be elastically deformed by means of load applied and own weight such that in a loaded condition of said at least one profile, said at least one profile extends such that the deflection of said at least one profile is less than the predetermined value. For instance, the predetermined value may be the distance between two adjacent suspension points of said at least one profile divided by a factor of 300. In the loaded condition of the profile, the curved portion of the profile is deflected due the load applied and the own weight of the profile.
- Said at least one profile may have a curvature in the same direction along its entire longitudinal extension in its unloaded condition. Thereby, a single upwardly curved portion is formed. The curved portion may be extending between two adjacent suspension points of the profile.
- Said at least one profile may comprise a plurality of upwardly curved portions with respective curvature in the same direction along a longitudinal direction of the profile and transition portions between said upwardly curved portions in its unloaded condition. The profile may be supported at more than two suspension points. The curved portions may have a uniform radius.
- A radius of curvature of a first curved portion may be different from a radius of curvature of a second of curved portion.
- Said at least one profile may be a main profile adapted to be suspended to a ceiling structure or adapted to be suspended by another profile. The profile may be suspended to the ceiling structure by means of hangers. Alternatively, at its ends, the profile may be suspended by profiles attached to two opposite walls.
- Said at least one profile may be a transverse profile adapted to be suspended by another profile. Such a transverse profile is normally only suspended at each end. As an example, the end portions of an transverse profile is resting on a first and a second main profile, respectively, and the transverse portion has a curved portion extending between the first and second main profiles by which the transverse profile is supported in its unloaded condition.
- Said at least one profile may be fixed directly to a ceiling structure of a building. The profile may be in abutment with the ceiling. By fixing the profile having at least one curved portion directly to the ceiling structure, an internal state of stress may be introduced into the profile as previously described.
- Said at least one profile may comprise a web and a flange. The flange may be adapted to support said at least one tile. For example, an edge portion of the ceiling tile may rest on the flange. Alternatively, the ceiling tile may be provided with a groove in which the flange is inserted such that the profile supports the ceiling tile.
- Said at least one profile may further comprise a capping enclosing at least a portion of the flange. The capping may be used in order to pre-stress the profile such that at least one curved portion is formed. Further, the capping improves the visual appearance of the grid as seen from inside the room and hides parts of the profile.
- Said at least one profile may be an inverted T-profile. The inverted T-profile includes a web extending in a vertical direction and a flange extending in a horizontal direction as seen in cross-section.
- According to a second aspect of the invention, the present invention is realised by a method for providing a profile for a suspended ceiling and having the features of claim 13.
- Preferably, the deflection of said at least one profile in the loaded condition is less than a distance between two adjacent suspension points of said at least one profile divided by a factor of 300.
- Preferably, the deflection of said at least one profile in the loaded condition is less than the distance between two adjacent suspension points of said at least one profile divided by a factor of 500.
- Such a profile having at least one upwardly curved portion extends in the loaded condition such that the deflection is less than a predetermined value determined according to a standard for suspended ceilings. Such an upwardly curved profile can carry a larger load without resulting in a deflection exceeding the allowed value according to various standards such as EN 13964. Alternatively, the material thickness of the profile can be reduced while deflection is maintained to an acceptable level. Thereby, material consumption of the profile may be reduced.
- Consequently, it is possible to calculate the curvature required in the unloaded condition such that the profile, in the loaded condition, extends such that the deflection is less, for example, than the distance between two suspension points divided by a factor of 300. The curvature in the unloaded condition of the profile is calculated such that the deflection of the profile in the loaded condition of the profile is less than a maximum allowed value, for example the deflection is less than the distance between two suspension points divided by a factor of 300.
- According to an alternative solution to the second aspect of the invention relating to the same problem, the present invention is realised by a method for providing a profile for a suspended ceiling and having the features of
claim 14. - The profile is pre-stressed by attaching the capping to the flange such that at least one upwardly curved portion is formed. By pre-stressing the profile, the profile is elastically deformed. The profile may form a part of a grid for a suspended ceiling.
- Such a pre-stressed profile can carry a larger load without resulting in a deflection exceeding the allowed value according to various standards such as EN 13964. Alternatively, the material thickness of the profile can be reduced while deflection is maintained to an acceptable level. Thereby, material consumption of the profile may be reduced. Further, by pre-stressing the profile, an advantageous stress distribution is obtained. Tensile stress is formed at the upper parts of the profile, which improves the stability of the profile and reduces the risk of lateral-torsional buckling.
- A combination of the two methods is also possible. In such case, the profile is both plastically and elastically deformed.
- The step of providing a profile may comprise roll forming at least one sheet blank into a profile having a web and a flange, wherein after the profile has been provided, at least one upwardly curved portion is formed by a second roll forming step.
- The method may further comprise providing a capping and attaching the capping to the flange. The capping may be attached to the flange after the profile has been provided with at least one curved portion. Alternatively, the capping may already be attached to the flange before the profile is provided with at least one curved portion.
- The step of attaching the capping to the flange may comprise folding the capping over at least a portion of the flange.
- The step of attaching the capping to the flange may comprise folding, gluing, welding and/or riveting the capping to the flange.
- The present invention will by way of example be described in more detail with reference to the appended schematic drawings, wherein
figures 4a-4c ,5a-5c ,6a-6c ,7a-7c ,8a-8c ,9a,9c show embodiments that do not form part of the present invention. -
Fig. 1 schematically discloses a suspended ceiling. -
Fig. 2a discloses an inverted T-profile. -
Fig. 2b discloses the inverted T-profile infig. 2a in cross-section. -
Fig. 3 discloses the deflection of a suspended profile in a loaded condition. -
Fig. 4a discloses a curved transverse profile in an unloaded condition. -
Fig. 4b discloses the transverse profile infig. 4a when being suspended. -
Fig. 4c discloses the transverse profile infig. 4b in a loaded condition. -
Fig. 5a discloses a curved main profile in an unloaded condition. -
Fig. 5b discloses the main profile infig. 5a when being suspended. -
Fig. 5c discloses the main profile infig. 5b in a loaded condition. -
Fig. 6a discloses a curved main profile in an unloaded condition. -
Fig. 6b discloses the main profile infig. 6a when being suspended. -
Fig. 6c discloses the main profile infig. 6b in a loaded condition. -
Fig. 7a discloses a main profile having three curved portions in an unloaded condition. -
Fig. 7b discloses the main profile infig. 7a when being suspended at three suspension points. -
Fig. 7c discloses the main profile infig. 7b in a loaded condition. -
Fig. 8a discloses a main profile having a plurality of curved portions in an unloaded condition. -
Fig. 8b discloses the main profile infig. 8a when being suspended. -
Fig. 8c discloses the main profile infig. 8b in a loaded condition. -
Fig. 9a discloses a main profile having a plurality of curved portions in an unloaded condition. -
Fig. 9b discloses the main profile infig. 9a when being suspended. -
Fig. 9c discloses the main profile infig. 9b in a loaded condition. -
Fig. 10a discloses a curved main profile in an unloaded condition. -
Fig. 10b discloses the main profile infig. 10a when being suspended to the ceiling structure. -
Fig. 10c discloses the main profile infig. 10b in a loaded condition. -
Fig. 11 schematically discloses a roll forming process for forming a curved portion of a profile. -
Fig. 1 , to which now is referred, shows schematically a suspendedceiling 1. The suspendedceiling 1 is attached to the ceiling structure of the building. The suspendedceiling 1 comprises agrid 10 and a plurality ofceiling tiles 5. Thegrid 10 comprises one ormore profiles grid 10 comprises profiles of two types;main profiles 2 extending in a first direction andtransverse profile 3 extending in a direction perpendicular to the first direction. Themain profiles 2 are suspended to the ceiling structure by means of suspension means 4, for example hangers. In some embodiments (not shown), the main profiles may be suspended by profiles attached to two opposite walls along the walls. Thetransverse profiles 3 are suspended by themain profiles 2. Consequently, themain profiles 2 support both theceiling tiles 5 forming the ceiling and thetransverse profiles 3, and any additional load. Such additional load may be various equipments such as lightning devices, ventilation equipments, inspection openings, detectors, cable trays, loudspeakers, signs, sprinklers etc. By load is meant both load resulting from the own weight of the profile and applied load in form of ceiling tiles, other profiles, additional load as described above etc. - The
ceiling tiles 5 may be made of man-made mineral fibre, such as a compressed mineral fibre material. More specifically, the mineral fibre material may be mineral wool, especially glass wool. In addition to the mineral fibre material, theceiling tiles 5 comprise a binder. Theceiling tiles 5 may further comprise at least one surface layer. - A
profile figs. 2a-b . Theprofile figs. 2a-b may be both a main profile and a transverse profile. Theprofile fig. 2b . Theprofile profile web 6, aflange 7 and acapping 8. Theweb 6 is extending in vertical direction. Theweb 6 comprises abulb 9. Theflange 7 is extending in the horizontal direction. Theflange 7 is adapted to supportceiling tiles 5. An edge portion of theceiling tile 5 may rest on theflange 7. Alternatively, theceiling tile 5 is provided with a groove in which theflange 7 is inserted such that theprofile ceiling tile 5. Thecapping 8 is attached to theflange 7. Thecapping 8 is extending along theflange 7. Thecapping 8 is folded over at least a portion of theflange 7. Thecapping 8 is covering at least a surface of theflange 7 facing the room when being suspended. Thereby, the underside of theflange 7 is not visible from the room, only thecapping 8. Thecapping 8 may be attached to theflange 7 by means of folding, gluing, welding and/or riveting the capping to the flange, or a combination thereof. - The
profile profile - A load on a
profile fig. 3 . The deflection f is proportional to the load and strongly depends on the distance L between the points where the profile is supported. Load includes the own weight of theprofile ceiling tiles 5 supported by theprofile profile profile Fig. 3 shows a conventional profile in a loaded condition. In its unloaded condition, the conventional profile is extending along a straight line. In its loaded condition, the profile becomes slightly curved as shown infig. 3 . The deflection f is measured as a maximum distance f between the profile and an imaginary straight line extending between the suspension points of the profile. - The decisive factor has been that the deflection, for example measured in mm, should be less than a predetermined value, for example less than the distance L between the suspension points, for example measured in mm, divided by a factor of 300, i.e. maximum allowed deflection is f=L/300. However, according to
EN13964 class 1, the maximum deflection allowed is 4 mm. -
Figs. 4a-4c shows aprofile 3 according to an embodiment for a suspended ceiling not forming part of the invention. Theprofile 3 infigs. 4a-c is atransverse profile 3 adapted to be supported bymain profiles 2 at its ends. - In
fig. 4a , theprofile 3 is in its unloaded condition. Theprofile 3 is plastically and/or elastically deformed such that it is slightly curved in its unloaded condition. Theprofile 3 thereby has one upwardlycurved portion 11 extending along its longitudinal extension. Thecurved portion 11 is extending between the suspension points 14, 15. Theprofile 3 has a curvature in the same direction along its entire longitudinal extension. In this embodiment, theprofile 3 has a constant curvature along its longitudinal extension. However, in other embodiments, the profile may have a varying curvature along its longitudinal extension. Theprofile 3 is upwardly curved in a vertical direction, i.e. in a plane perpendicular to the plane of the suspendedceiling 1 when mounted. Theprofile 3 is concavely curved in an upward direction as viewed from a side of the profile adapted to face the interior of a room when mounted in a suspended ceiling. - In its unloaded condition, as shown in
fig. 4a , theprofile 3 is curved such that the maximum distance between an imaginary straight line between the end points of the profile and the curved portion of theprofile 3 is do. -
Fig. 4b shows thetransverse profile 3 infig. 4a when being suspended in a suspendedceiling 1. Theprofile 3 is suspended bymain profiles 2. Each end of theprofile 3 rests on amain profile 2. The load of the own weight of theprofile 3 may reduce the curvature ofprofile 3 and make theprofile 3 slightly more straight. The curvature of theprofile 3 may be reduced by the own load of theprofile 3 such that the maximum distance d1 between an imaginary straight line between the suspension points and theprofile 3 is less than d0. -
Fig. 4c shows thetransverse profile 3 in a loaded condition when forming part of agrid 10 for suspendedceiling 1. In the loaded condition, the load deforms theprofile 3 such that the profile assumes an essentially linear extension. The load includes the own weight of theprofile 3 and external load applied, such as weight ofceiling tiles 5. The load deflects theprofile 3 such that the curvature becomes straightened or deflected. By essentially linear extension is meant that the maximum deflection f is less than a predetermined value, for example the distance L measured in mm between the two adjacent suspension points 14, 15 of theprofile 3 divided by a factor of 300.This implies that theprofile 3 in its loaded condition may be straight, or may be slightly curved or deflected, as long as the deflection does not exceed the predetermined value, for example the distance L between two adjacent suspension points 14, 15 of theprofile 3 divided by a factor of 300. As long as the maximum deflection is not exceeded, theprofile 3 may be both slightly convexly curved or slightly concavely curved in its loaded condition. Deflection around L/400 is possible to for the human eye to detect. By keeping the deflection below L/500, the human eye will not detect the deflection. - As an example, the distance between the suspension points for the
transverse profile 3 infig. 4c may be 1200 mm. The maximum allowed deflection is then 1200/300=4 mm. As an example, thetransverse profile 3 may be curved such that in its unloaded condition, the maximum distance do between theprofile 3 and an imaginary straight line extending between the ends of theprofile 3 is 4 mm. Thereby, thetransverse profile 3 may carry a load being doubled compared to a conventional straight profile without increasing the deflection in its loaded condition. Alternatively, it is possible to make theprofile 3 weaker while maintaining the same deflection in its loaded condition. However, by curving the profile even more by increasing the distance do between theprofile 3 and an imaginary straight line extending between the ends of theprofile 3, the profile can carry a load being more than doubled still fulfilling the deflection requirement. -
Figs. 5a-c discloses aprofile 2 according to a further embodiment for a suspended ceiling not forming part of the invention. Infigs. 5a-c , the profile is amain profile 2 being suspended to the ceiling structure at two suspension points 16, 17 by means of suspension means 4. Alternatively, themain profile 2 may be supported by profiles (not shown), for example profiles attached to two opposite walls. - In
fig. 5a , theprofile 2 is in its unloaded condition before being suspended to the ceiling. Theprofile 2 is plastically and/or elastically deformed such that it is slightly curved in its unloaded condition. Theprofile 2 thereby has one upwardlycurved portion 21 extending along its longitudinal extension. When suspended, thecurved portion 21 will be extending between two suspension points 16, 17. Theprofile 2 has a curvature in the same direction along its entire longitudinal extension. In this embodiment, theprofile 2 has a constant curvature along its longitudinal extension. However, in other embodiments, the profile may have a varying curvature along its longitudinal extension. Theprofile 2 is upwardly curved in a vertical direction, i.e. in plane perpendicular to the plane of the suspendedceiling 1. Theprofile 2 is concavely curved in an upward direction as viewed from a side of the profile adapted to face the interior of a room when mounted in a suspended ceiling. - In its unloaded condition, as shown in
fig. 5a , theprofile 2 is curved such that the maximum distance between an imaginary straight line extending between end points of theprofile 2 and the curved portion of theprofile 2 is do. -
Fig. 5b shows themain profile 2 infig. 5a when being suspended to the ceiling structure by suspension means 4. Theprofile 2 is suspended at its respectively ends 16, 17. Theprofile 2 is upwardly curved. However, the load of the own weight of theprofile 3 may reduce the curvature ofprofile 2 to some extent and make theprofile 2 more straight. The curvature of theprofile 2 may be reduced by the own load of theprofile 2 such that the maximum distance d1 between an imaginary straight line between the suspension points and theprofile 2 is less than d0. -
Fig. 5c shows themain profile 2 in a loaded condition when forming part of agrid 10 for a suspendedceiling 1. In the loaded condition, the load deforms theprofile 2 such that theprofile 2 assumes an essentially linear extension or deflected extension. The load includes the own weight of theprofile 2 and external load applied, such as weight ofceiling tiles 5 and oftransverse profiles 3 suspended by themain profile 2. The load deflects theprofile 2 such that the curvature is straightened or deflected downwards. By essentially linear extension is meant that the maximum deflection is equal or is less than a predetermined value, for example the distance L measured in mm between the two adjacent suspension points 16, 17 of theprofile 2 divided by a factor of 300.This implies that theprofile 2 in its loaded condition may be straight, or may be slightly curved, as long as the deflection f does not exceed the predetermined value, for example the distance L measured two adjacent suspension points of said at least one profile divided by a factor of 300. As long as the maximum deflection is not exceeded, theprofile 2 may be both slightly convexly curved or slightly concavely curved in its loaded condition. - As an example, the distance between the suspension points 16, 17 for the
main profile 2 infig. 4c may be 1200 mm. The maximum allowed deflection is then 1200/300=4 mm. Themain profile 2 may be curved such that in its unloaded condition, the maximum distance d between theprofile 2 and an imaginary straight line extending between the ends of theprofile 2 is 4 mm. Thereby, themain profile 2 may carry a load being doubled compared to a conventional straight profile without increasing the deflection in its loaded condition. Alternatively, it is possible to make theprofile 2 weaker while maintaining the same deflection in its loaded condition. However, by curving theprofile 2 even more by increasing the distance do between theprofile 2 and an imaginary straight line extending between the ends of theprofile 2, the profile can carry a load being more than doubled still fulfilling the deflection requirement. -
Figs. 6a-c discloses aprofile 2 according to a further embodiment for a suspended ceiling not forming part of the invention. Infigs. 6a-c , the profile is amain profile 2 being suspended to the ceiling structure at threesuspension points main profile 2 may be supported by profiles attached to two opposite walls at its ends (not shown). - In
fig. 6a , theprofile 2 is in its unloaded condition before being suspended to the ceiling. Theprofile 2 is plastically and/or elastically deformed such that it is slightly curved in its unloaded condition. Theprofile 2 thereby has one upwardlycurved portion 21 extending along its longitudinal extension. When suspended, thecurved portion 21 will be extending between threesuspension points profile 2 has a curvature in the same direction along its entire longitudinal extension. In this embodiment, theprofile 2 has a constant curvature along its longitudinal extension. However, in other embodiments, the profile may have a varying curvature along its longitudinal extension. Theprofile 2 is upwardly curved in a vertical direction, i.e. in plane perpendicular to the plane of the suspendedceiling 1 when mounted. Theprofile 2 is concavely curved in an upward direction as viewed from a side of the profile adapted to face the interior of a room when mounted in a suspended ceiling. - In its unloaded condition, as shown in
fig. 6a , theprofile 2 is curved such that the maximum distance between an imaginary straight line extending between end points of theprofile 2 and the curved portion of theprofile 2 is do. -
Fig. 6b shows themain profile 2 infig. 6a when being suspended to the ceiling structure by suspension means 4. Theprofile 2 is suspended at its respectively ends. Theprofile 2 is upwardly curved. However, the load of the own weight of theprofile 2 may reduce the curvature ofprofile 2 to some extent and make theprofile 2 more straight. The curvature of theprofile 2 may be reduced by the own load of theprofile 2 such that the maximum distance d1 between an imaginary straight line between the suspension points and theprofile 2 is less than d0. - When being suspended to the ceiling structure but still not carrying any additional load, as shown in
fig. 6b , theprofile 2 may not be supported at thesecond suspension point 17, due to the curvature of theprofile 2. -
Fig. 6c shows themain profile 2 in a loaded condition when forming part of agrid 10 for a suspendedceiling 1. In the loaded condition, the load deforms theprofile 2 such that theprofile 2 assumes an essentially linear extension or deflected extension. The load includes the own weight of theprofile 2 and external load applied, such as weight ofceiling tiles 5 and oftransverse profiles 3 suspended by themain profile 2. The load deflects theprofile 2 such that the curvature is straightened or deflected downwards. By essentially linear extension is meant that the maximum deflection f is less than a predetermined value, for example the distance L measured in mm between the two adjacent suspension points 16, 17 of theprofile 2 divided by a factor of 300.This implies that theprofile 2 in its loaded condition may be straight, or may be slightly curved, as long as the deflection f does not exceed the predetermined value, for example the distance L measured two adjacent suspension points of said at least one profile divided by a factor of 300. As long as the maximum deflection f is not exceeded, theprofile 2 may be both slightly convexly curved or slightly concavely curved in its loaded condition. - As an example, the distance between the suspension points 16, 17 for the
main profile 2 infig. 4c may be 1200 mm. The maximum allowed deflection is then 1200/300=4 mm. Themain profile 2 may be curved such that in its unloaded condition, the maximum distance d between theprofile 2 and an imaginary straight line extending between the ends of theprofile 2 is 4 mm. Thereby, themain profile 2 may carry a load being more than doubled compared to a conventional straight profile without increasing the deflection in its loaded condition. Alternatively, it is possible to make theprofile 2 weaker while maintaining the same deflection in its loaded condition. -
Figs. 7a-c discloses aprofile 2 according to a further embodiment for a suspended ceiling not forming part of the present invention. Theprofile 2 infigs. 7a-c is amain profile 2. - In its unloaded condition before being suspended to the ceiling, as shown in
fig. 7a , themain profile 2 includes two upwardlycurved end portions curved transition portion 23 extending between said end portions. Thecurved end portions transition portion 23 is convexly curved in an upward direction in the vertical plane as viewed from a side of the profile adapted to face the interior of a room when mounted in a suspended ceiling. Theprofile 2 is adapted to be suspended to the ceiling structure at threesuspension points profile 2 is elastically and/or plastically deformed such that the twocurved portions - In its unloaded condition, as shown in
fig. 7a , theprofile 2 comprises threecurved portions curved end portion 21 is extending between thefirst suspension point 16 and a point adjacent thesecond suspension point 17. The secondcurved end portion 22 is extending between thethird suspension point 18 and a point adjacent thesecond suspension point 17. The second suspension point is arranged at a point of thetransition portion 23 wherein the tangent is horizontal. Thetransition portion 23 is extending between the first and secondcurved end portions - The maximum distance between an imaginary line extending between the ends of the profile and the profile is do.
-
Fig. 7b shows themain profile 2 infig. 7a when being suspended to the ceiling structure by suspension means 4. Theprofile 2 is suspended to the ceiling structure at threesuspension points suspension points - When being suspended, the load of the own weight of the
profile 2 may reduce the curvature ofprofile 2 to some extent and make theprofile 2 slightly more straight. The maximum distance d1 between an imaginary line extending between the ends of the profile and the profile is less than do. -
Fig. 7c shows themain profile 2 in a loaded condition when forming part of agrid 10 for a suspendedceiling 1. In the loaded condition, the load deforms theprofile 2 such that theprofile 2 assumes an essentially linear extension. The load includes the own weight of theprofile 2 and external load applied, such as weight ofceiling tiles 5 and oftransverse profiles 3 suspended by themain profile 2. The load deflects theprofile 2 such that the twocurved portions profile 2 in its loaded condition may be straight, or may have slightly curved portions, as long as the deflection f does not exceed the predetermined value, for example the distance L measured in mm between two adjacent suspension points of said at least one profile divided by a factor of 300. As long as the maximum deflection f is not exceeded, theprofile 2 may have both slightly convexly curved portions or slightly concavely curved portions in its loaded condition. -
Figs. 8a-c discloses aprofile 2 according to a further embodiment for a suspended ceiling not forming part of the present invention. The profile infigs. 8a-c is amain profile 2 including fivecurved portions - In the unloaded condition before being mounted to a suspended ceiling, as shown in
fig. 8a , themain profile 2 includes three upwardlycurved portions curved transition portions curved portions curved transition portions curved portions profile 2 is adapted to be suspended to the ceiling structure at foursuspension points profile 2 is elastically and/or plastically deformed such that threecurved portions - The distance α between two adjacent suspension points 16, 17, 18, 19 is equal for all suspension points. The three upwardly curved portions have a curvature in the same direction in the longitudinal direction. However, the three upwardly curved portions have different radius of curvature. For the first and third
curved portions curved portion 32, the maximum distance between the profile and an imaginary straight line extending between the suspension points is d0b, which is less than d0a. Thereby, the radius of curvature of the second curved portion is smaller than the radius of curvature of the first and third curved portion. -
Fig. 8b shows themain profile 2 infig. 8a when being suspended to the ceiling structure by suspension means 4. Theprofile 2 is suspended to the ceiling structure at foursuspension points suspension points profile 2 into three sections. The foursuspension points first suspension point 16 is arranged at the first end of theprofile 2. Thesecond suspension point 17 is arranged at afirst transition portion 34 extending between the first and second upwardly curved portions. The third suspension point is arranged at asecond transition 35 portion extending between the second and third upwardly curved portions. Thefourth suspension point 19 is arranged at the second end of theprofile 2. - When being suspended, the
profile 2 comprises three upwardlycurved portions profile 2 may reduce the curvature of profile to some extent and make the profile slightly more straight, i.e. the maximum distance between the profile and an imaginary straight line extending between the suspension points is less than d0a and d0b, respectively. In the shown embodiment, for the first and thirdcurved portions curved portion 32, the maximum distance between the profile and an imaginary straight line extending between the suspension points is d1b, which is less than d1a. -
Fig. 8c shows themain profile 2 in a loaded condition when forming part of agrid 10 for a suspendedceiling 1. In the loaded condition, the load deforms theprofile 2 such that theprofile 2 assumes an essentially linear extension. The load includes the own weight of theprofile 2 and external load applied, such as weight ofceiling tiles 5 and oftransverse profiles 3 suspended by themain profile 2. The load deflects theprofile 2 such that the threecurved portions profile 2 divided by a factor of 300.This implies that theprofile 2 in its loaded condition may be straight, or may have slightly curved portions, as long as the deflection f does not exceed the predetermined value, for example the distance L measured in mm between two adjacent suspension points of said at least one profile divided by a factor of 300. As long as the maximum deflection f is not exceeded, theprofile 2 may have both slightly convexly curved portions or slightly concavely curved portions in its loaded condition. Infig. 8c , the deflection fb of thesecond portion 32 is less than the deflection fa of the first andthird portion -
Figs. 9a-c discloses aprofile 2 according to a further embodiment for a suspended ceiling not forming part of the present invention. The profile infigs. 9a-c is amain profile 2 including fivecurved portions - In the unloaded condition of the profile before being mounted to a suspended ceiling, as shown in
fig. 9a , themain profile 2 includes three upwardlycurved portions curved transition portions curved portions profile 2 is adapted to be suspended to the ceiling structure at foursuspension points profile 2 is elastically and/or plastically deformed such that threecurved portions - The embodiment shown in
figs. 9a-c differs from the embodiment shown infigs. 8a-c in that the distance between adjacent suspension points 16, 17, 18, 19 differs. The distance between the first andsecond suspension point fourth suspension point third suspension point - Before being suspended, as shown in
fig. 9a , for the first and thirdcurved portions curved portion 32, the maximum distance between the profile and an imaginary straight line extending between the suspension points is d0b, which is larger than d0a. However, a ratio defined as the deflection d0a, d0b divided by the length α1, α2 between respective suspension points is the same for the first, second and third upwardlycurved portions -
Fig. 9b shows themain profile 2 infig. 9a when being suspended to the ceiling structure by suspension means 4. Theprofile 2 is suspended to the ceiling structure at foursuspension points second suspension point 17 is arranged at a first transition portion extending between the first and second upwardly curved portions. The third suspension point is arranged at a second transition portion extending between the second and third upwardly curved portions. Thefourth suspension point 19 is arranged at the second end of theprofile 2. - When being suspended, the
profile 2 comprises three upwardlycurved portions profile 2 may reduce the curvature of profile to some extent and make the profile slightly more straight, i.e. the maximum distance d1a, d1b between the profile and an imaginary straight line extending between the suspension points is less than d0a, d0b, respectively. In the shown embodiment, for the first and thirdcurved portions curved portion 32, the maximum distance between the profile and an imaginary straight line extending between the suspension points is d1b, which is larger than d1a. However, a ratio defined as the deflection d0a, d0b divided by the length α1, α2 between respective suspension points is the same for the first, second and third upwardlycurved portions -
Fig. 9c shows themain profile 2 in a loaded condition when forming part of agrid 10 for a suspendedceiling 1. In the loaded condition, the load deforms theprofile 2 such that theprofile 2 assumes an essentially linear extension. The load includes the own weight of theprofile 2 and external load applied, such as weight ofceiling tiles 5 and oftransverse profiles 3 supported by themain profile 2. The load deflects theprofile 2 such that the threecurved portions profile 2 divided by a factor of 300.This implies that theprofile 2 in its loaded condition may be straight, or may have slightly curved portions, as long as the deflection does not exceed the predetermined value, for example the distance L measured in mm between two adjacent suspension points of said at least one profile divided by a factor of 300. As long as the maximum deflection f is not exceeded, theprofile 2 may have both slightly convexly curved portions or slightly concavely curved portions in its loaded condition. Infig. 9c , the deflection fb of thesecond portion 32 is larger than the deflection fa of the first andthird portion curved portions - It is contemplated that in further embodiments, the
profile ceiling 1, theprofile profile profile - To sum up, by providing the
profile profile profile profile profile profile profile - In an embodiment according to the present invention, which is shown in
fig. 10a-c , is theprofile 2 fixed directly to the ceiling structure of the building. The profile may be a main profile or a transverse profile. In its unloaded condition, when not affected by the gravity resulting from the own weight of theprofile 2 or any additional load in the vertical direction, theprofile 2 is upwardly curved, as shown infig. 10a . The profile2 is plastically and/or elastically deformed such that it is slightly curved in its unloaded condition. Theprofile 2 thereby has one upwardlycurved portion 11 extending along its longitudinal extension. Thecurved portion 11 is extending between the suspension or fastening points 14, 15. Theprofile 2 has a curvature in the same direction along its entire longitudinal extension. In this embodiment, theprofile 2 has a constant curvature along its longitudinal extension. However, in other embodiments, the profile may have a varying curvature along its longitudinal extension. Theprofile 2 is upwardly curved in a vertical direction, i.e. in a plane perpendicular to the plane of the suspendedceiling 1 when mounted. Theprofile 2 is concavely curved in an upward direction as viewed from a side of the profile adapted to face the interior of a room when mounted in a suspended ceiling. The maximum distance between an imaginary line extending between the ends of the profile and the profile is do. - When the
profile 2 is suspended and fixed to the ceiling structure, as shown infig. 10b , theprofile 2 will be forced to become straightened. Theprofile 2 when suspended will have an essential linear extension, preferably parallel to the ceiling structure. Theprofile 2 may directly abut the ceiling structure, or may be arranged at distance from the ceiling structure. When theprofile 2 is arranged at distance from the ceiling structure, a spacer may be arranged between theprofile 2 and the ceiling structure. - As a consequence of the
curved profile 2 being forced into a straight extension, an internal state of stress is introduced into theprofile 2 and the profile is thereby pre-stressed. Introducing an internal state of stress is advantageous for the load carrying capacity of theprofile 2. Thus, theprofile 2 may carry an increased load without reaching a critical deflection. Alternatively, if the load remains the same as for a conventional profile, the material thickness of the profile may be reduced without reaching maximum allowed deflection. -
Fig. 10c shows themain profile 2 in a loaded condition when forming part of agrid 10 for a suspendedceiling 1. In the loaded condition, the load deforms theprofile 2 such that theprofile 2 assumes an essentially linear extension or deflected extension. The load includes the own weight of theprofile 2 and external load applied, such as weight ofceiling tiles 5 and oftransverse profiles 3 suspended by themain profile 2. The load deflects theprofile 2 such that the curvature is straightened or deflected downwards. By essentially linear extension is meant that the maximum deflection f is less than a predetermined value, for example the distance L measured in mm between the two adjacent suspension points 16, 17 of theprofile 2 divided by a factor of 300.This implies that theprofile 2 in its loaded condition may be straight, or may be slightly curved, as long as the deflection f does not exceed the predetermined value, for example the distance L measured two adjacent suspension points of said at least one profile divided by a factor of 300. As long as the maximum deflection f is not exceeded, theprofile 2 may be both slightly convexly curved or slightly concavely curved in its loaded condition. - It is to be understood that the
profiles figs. 4a-c ,5a-c ,6a-c ,7a-c ,8a-c ,9a-c , and10a-c all are adapted to form part of agrid 10 for a suspendedceiling 1 as described above in connection withfig. 1 . Further, it is to be understood thattransverse profiles 3 comprising at least one curved portion may be combined with conventional profiles as well asmain profiles 2 comprising at least one curved portion, and the opposite. - The curved portion or portions of the profile may be achieved by curving the profile, for example in a roll forming operation, or by pre-stressing the profile.
- A method of providing the
profile fig. 11 . In the roll forming operation, theprofile profile profile web 6 andflange 7 is formed. In the preferred embodiment, theprofile - Further, in the roll forming operation, pressure is applied to the
profile fig. 11 . For example, theprofile pressure roll 31 and a pair ofopposite rolls pressure roll 31 applies pressure on theprofile profile profile profile figs. 4a-c ,5a-c ,6a-c and10a-c are obtained. Alternatively, a non-uniform pressure may be applied on theprofile profile profile figs. 7a-c ,8a-c and9a-c may be formed by applying pressure to a first portion of theprofile profile profile profile profile capping 8, before or after the curved portion is formed. - It contemplated that the
profile profile - An alternative solution to the above described method, also having the object to provide a
profile profile profile profile - The
profile capping 8 attached to theflange 7 of theprofile profile web 6 and aflange 7 is formed in any conventional way, such as by roll forming as described above. Acapping 8 is adapted to enclose at least a portion of theflange 7, especially a side of theflange 7 adapted to face the room when theprofile capping 8 is provided in form of an elongated sheet or strip of metal which is folded around theflange 7 of theprofile capping 8 is attached to theflange 7 by means of folding, gluing, welding and/or riveting the capping to the flange. A combination of the alternatives mentioned is also possible. - In order to pre-stress the
profile capping 8 in the longitudinal direction is less than the length of theprofile capping 8 is to be attached. The ends of theprofile capping 8 are aligned such that thecapping 8 is to be extending along the entire length of theprofile capping 8 is attached to a first end of theprofile capping 8 is attached to a second end of theprofile capping 8 is then adhered to theflange 7 of theprofile profile profile figs. 4a-c ,5a-c ,6a-c and10a-c is obtained. Theprofile - It is to be understood that the curvature of the curved portions in the figures is highly exaggerated in order to make the curvature visible. For example, for a profile being suspended between two suspension points arranged at distance of 1200 mm from each other, the maximum distance d between the curved portion an imaginary straight line could be for example in the range of 2-4 mm.
- It is contemplated that there are numerous modifications of the embodiments described herein, which are still within the scope of the invention as defined by the appended claims. For example, it is to be contemplated that a transverse profile also may be provided with more than one curved portion, although not shown in the drawings.
- In the above described embodiments, the profile has been an inverted T-profile. However, a person skilled in the art contemplates that the invention also may be applied to a profile of any other shape, for example, a L-shaped profile, a I-shaped profile, a Z-shaped profile etc. Further, in the shown embodiments, the profiles are provided with a bulb. However, it is contemplated that the invention also may be applied to a profile without any bulb.
- It is also to be understood that the main profile instead of being suspended by hangers or directly to the ceiling structure may be suspended by another profile, for example profiles attached to two opposite walls, and be provided with curved portion/portions in the manner described above.
- In the shown embodiments not forming part of the present invention, the profile is shown as slightly curved when it is suspended but not carrying any additional load in addition to the own weight of the profile, as shown in
figs. 4b ,5b ,6b ,7b ,8b , and9b . However, the own weight of the profile may result in that the profile has an essentially linear extension when being suspended. In the loaded condition, the additional load may result in a deflection not exceeding the length of the profile L divided by 300.
Claims (18)
- A suspended ceiling (1) comprising a grid (10) and at least one ceiling tile (5), the grid (10) being formed of a plurality of profiles (2, 3) and being adapted to support said at least one ceiling tile (5), wherein each profile (2, 3) is adapted to be supported at at least two suspension points,
characterised in
that at least one profile (2, 3) of said plurality of profiles comprises in an unloaded condition at least one upwardly curved portion which extends in a first direction, and
that said at least one profile (2, 3), when the suspended ceiling (1) is attached to a ceiling structure, is suspended and fixed to the ceiling structure such that it is forced into a straight extension whereby an internal state of stress is introduced into said at least one profile (2, 3),
whereby the at least one profile (2, 3) is arranged such that, in a loaded condition of said at least one profile (2, 3), a deflection (f) of said at least one upwardly curved portion in a second direction, which is opposite said first direction, is less than a predetermined value, whereby said at least one profile obtains an essentially linear extension. - A suspended ceiling (1) according to claim 1, wherein, in a loaded condition of said at least one profile (2, 3), said at least one profile (2, 3) extends such that the deflection (f) of said at least one profile (2, 3) is less than a distance (L) between two adjacent suspension points of said at least one profile (2, 3) divided by a factor of 300, preferably less than a distance (L) between two adjacent suspension points of said at least one profile (2, 3) divided by a factor of 500.
- A suspended ceiling (1) according to claim 1 or 2, wherein said at least one profile (2, 3) is plastically and/or elastically deformed in its unloaded condition.
- A suspended ceiling (1) according to any one of claims 1-3, wherein said at least one profile (2, 3) is pre-stressed in its unloaded condition.
- A suspended ceiling (1) according to any one of claims 1-4, wherein said at least one curved portion is concavely curved in an upward direction in the unloaded condition of the profile (2, 3) as viewed from a side of the profile adapted to face the interior of a room when mounted in a suspended ceiling..
- A suspended ceiling (1) according to any one of claims 1-5, wherein said at least profile (2, 3) in its loaded condition is elastically deformed by means of load applied and own weight such that in the loaded condition of said at least one profile (2, 3), said at least one profile (2, 3) extends such that the deflection (f) of said at least one profile (2, 3) is less than the predetermined value.
- A suspended ceiling (1) according to any one of claims 1-6, wherein said at least one profile (2, 3) has a curvature in the same direction along its entire longitudinal extension in its unloaded condition.
- A suspended ceiling (1) according to any one of claims 1-6, wherein said at least one profile (2, 3) comprises a plurality of upwardly curved portions with respective curvature in the same direction along a longitudinal direction of the profile and transition portions between said upwardly curved portions in its unloaded condition.
- A suspended ceiling (1) according to claim 8, wherein a radius of curvature of a first curved portion is different from a radius of curvature of a second of curved portion.
- A suspended ceiling (1) according to any one of claim 1-9, wherein said at least one profile is a main profile (2) adapted to be suspended to a ceiling structure or adapted to be suspended by another profile.
- A suspended ceiling (1) according to any one of claims 1-9, wherein said at least one profile is a transverse profile (3) adapted to be suspended by another profile (2).
- A suspended ceiling (1) according to any one of claims 1-9, wherein said at least one profile (2) is fixed directly to a ceiling structure of a building.
- Method for providing a profile (2, 3) for a suspended ceiling (1), comprising
providing a profile (2, 3),
forming at least one upwardly curved portion of the profile (2, 3) extending in a first direction by plastically deforming at least one portion of the profile (2, 3),
suspending and fixing said profile (2, 3) to a ceiling structure such that it is forced into a straight extension whereby an internal state of stress is introduced into said profile (2, 3),
whereby the profile (2, 3) is arranged such that, in a loaded condition of said at least one profile (2, 3) when forming part of the suspended ceiling (1), a deflection (f) of said at least one upwardly curved portion in a second direction, which is opposite said first direction, is less than a predetermined value, whereby said at least one profile obtains an essentially linear extension. - Method for providing a profile (2, 3) for a suspended ceiling (1), comprising
providing a profile (2, 3) having a web (6) and a flange (7),
pre-stressing the profile (2, 3) by attaching a capping (8) to the flange (7), wherein the length of the capping (8) is less than the length of the profile (2, 3), and
suspending and fixing said profile (2, 3) to a ceiling structure such that it is forced into a straight extension whereby an internal state of stress is introduced into said profile (2, 3),
wherein the profile (2, 3) is further arranged to keep a deflection (f) in a loaded condition less than a predetermined value. - Method according to claim 13, wherein the step of providing a profile (2, 3) comprises roll forming at least one sheet blank into a profile (2, 3) having a web (6) and a flange (7), wherein after the profile (2, 3) has been provided, at least one upwardly curved portion is formed by a second roll forming step.
- Method according to claim 13 or 15, further comprises providing a capping (8) and attaching the capping (8) to the flange (7).
- Method according to claim 14 or 16, wherein the step of attaching the capping (8) to the flange (7) comprises folding the capping (8) over at least a portion of the flange (7).
- Method according to any one of claims 14, 16 or 17, wherein the step of attaching the capping (8) to the flange (7) comprises folding, gluing, welding and/or riveting the capping (8) to the flange (7).
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11179024.2A EP2562323B1 (en) | 2011-08-26 | 2011-08-26 | A suspended ceiling and a method for providing a profile for a suspended ceiling |
PL11179024T PL2562323T3 (en) | 2011-08-26 | 2011-08-26 | A suspended ceiling and a method for providing a profile for a suspended ceiling |
DK11179024.2T DK2562323T3 (en) | 2011-08-26 | 2011-08-26 | Hanging ceiling and method for providing a profile for a hanging ceiling |
PCT/EP2012/066441 WO2013030091A1 (en) | 2011-08-26 | 2012-08-23 | A suspended ceiling and a method for providing a profile for a suspended ceiling |
EA201490442A EA201490442A1 (en) | 2011-08-26 | 2012-08-23 | SUSPENDED CEILING AND METHOD FOR OBTAINING A PROFILE FOR SUSPENDED CEILING |
ZA2014/02146A ZA201402146B (en) | 2011-08-26 | 2014-03-24 | A suspended ceiling and a method for providing a profile for a suspended ceiling |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11179024.2A EP2562323B1 (en) | 2011-08-26 | 2011-08-26 | A suspended ceiling and a method for providing a profile for a suspended ceiling |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2562323A1 EP2562323A1 (en) | 2013-02-27 |
EP2562323B1 true EP2562323B1 (en) | 2018-07-04 |
Family
ID=46717859
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11179024.2A Not-in-force EP2562323B1 (en) | 2011-08-26 | 2011-08-26 | A suspended ceiling and a method for providing a profile for a suspended ceiling |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2562323B1 (en) |
DK (1) | DK2562323T3 (en) |
EA (1) | EA201490442A1 (en) |
PL (1) | PL2562323T3 (en) |
WO (1) | WO2013030091A1 (en) |
ZA (1) | ZA201402146B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3839164A1 (en) | 2019-12-16 | 2021-06-23 | Saint-Gobain Ecophon AB | Suspended ceiling system and method for installing thereof |
EP3879044B1 (en) | 2020-03-13 | 2024-09-04 | Saint-Gobain Ecophon AB | Ceiling tile and suspended ceiling system comprising such a ceiling tile |
CN115288355A (en) * | 2022-07-29 | 2022-11-04 | 广东省建筑设计研究院有限公司 | Daylighting structure is synthesized to hot winter warm area hub airport terminal in summer |
CN116065750B (en) * | 2023-03-06 | 2023-06-06 | 山西五建集团有限公司 | Steel structure multifunctional hall wavy aluminum plate suspended ceiling and modularized installation method thereof |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5088261A (en) * | 1990-12-20 | 1992-02-18 | Usg Interiors, Inc. | Curved grid tees for suspension ceilings |
DE10139751A1 (en) * | 2001-08-29 | 2002-02-28 | Karl Gerhards | Load-bearing structure for incorporation in steel-framed buildings, vehicles, ships, cranes, lifting gantries |
US8359812B2 (en) | 2006-12-29 | 2013-01-29 | Usg Interiors, Llc | Single strip single web grid tee |
GB2456328A (en) | 2008-01-11 | 2009-07-15 | Usg Interiors Inc | Grid members for a suspended ceiling and methods of making same |
US20100095606A1 (en) * | 2008-10-16 | 2010-04-22 | Usg Interiors, Inc. | Faceted metal suspended ceiling |
DE202010003967U1 (en) * | 2010-03-22 | 2010-06-17 | Lindner Ag | Ceiling or wall element |
-
2011
- 2011-08-26 DK DK11179024.2T patent/DK2562323T3/en active
- 2011-08-26 EP EP11179024.2A patent/EP2562323B1/en not_active Not-in-force
- 2011-08-26 PL PL11179024T patent/PL2562323T3/en unknown
-
2012
- 2012-08-23 EA EA201490442A patent/EA201490442A1/en unknown
- 2012-08-23 WO PCT/EP2012/066441 patent/WO2013030091A1/en active Application Filing
-
2014
- 2014-03-24 ZA ZA2014/02146A patent/ZA201402146B/en unknown
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
WO2013030091A1 (en) | 2013-03-07 |
EA201490442A1 (en) | 2014-08-29 |
ZA201402146B (en) | 2015-11-25 |
EP2562323A1 (en) | 2013-02-27 |
PL2562323T3 (en) | 2019-01-31 |
DK2562323T3 (en) | 2018-10-15 |
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