Ceiling traverse stirrup and ceiling traverse device

Abstract

The present invention relates to a ceiling truss corner bracket (2) which is designed to be attached to a truss body (34) and to be suspended as a ceiling truss in support profiles of a dry construction ceiling, and to a ceiling truss (30).

Description

[0001] The present invention relates to the subject matter specified in the claims and in particular to a fitting for a ceiling truss in drywall construction, as well as a ceiling truss which is provided with several such fittings.

[0002] The present invention relates to the construction of special drywall ceilings and, in particular, suspended drywall ceilings. Ceilings are used especially in modern buildings to conceal existing ceiling structures, such as cast-in-place concrete or electrical, plumbing, and heating installations. A suspended ceiling can contribute to improved sound and thermal insulation and, by reducing the room volume, enable more efficient heating. Suspended ceilings can also be used for aesthetic reasons, for example, to achieve a desired ceiling height. In drywall construction, wall trusses are already known that are connected to a stud frame to allow forces to be transferred to a drywall partition even outside the stud frame itself.

[0003] A suspended ceiling typically consists of wall profiles attached to the walls, as well as hangers that are mounted to the ceiling in a grid pattern. A primary framework or base profiles, running parallel to each other at regular intervals, are then attached to the hangers. Perpendicular to the base profiles, support profiles are attached to them. Finally, plasterboard panels are screwed to the support profiles using self-tapping screws. Such a ceiling construction only allows forces to be transferred into the ceiling via the support profiles, for example, to install a ceiling light or chandelier. Because the support profiles are relatively narrow and usually made of relatively thin sheet metal, they cannot bear significant loads, even when screwed directly to the ceiling, as the forces are concentrated in too small an area.

[0004] To transfer loads into drywall ceilings, compromise solutions are usually employed, such as screwing a wooden board between two adjacent studs, ideally as high as a supporting stud. Since the supporting studs are already attached to the ceiling, relatively heavy loads can be supported in this way. Another option is to modify a drywall wall joist to accommodate the slightly different construction of a drywall ceiling. Sheet metal joists from drywall walls can be screwed to the supporting studs of drywall ceilings relatively easily, but they also have the disadvantage that the load-bearing capacity is relatively low due to the sheet metal material. US5369928A describes a known ceiling joist corner bracket.

[0005] It is therefore desirable to have a ceiling truss available that is very easy to install. It is also desirable to have a ceiling truss available that is very easy to manufacture with as few machines and as few cuts as possible.

[0006] This problem is solved by a ceiling truss retaining bracket or ceiling truss corner fitting according to the present independent claim 1, by a ceiling truss body according to claim 11, as well as by a ceiling truss according to claim 12 and a dry construction ceiling according to claim 15, wherein preferred embodiments are described in the dependent claims.

[0007] For better understanding, the following terms are defined below. The present invention relates to a fitting, a mounting bracket, or a retaining bracket for a ceiling truss, as well as a ceiling truss comprising this retaining bracket, and a sheet metal ceiling truss. The following definitions refer to both the ceiling truss bracket and the ceiling truss or ceiling truss body, but are defined here only with regard to the ceiling truss. The ceiling truss has a substantially plate-like shape and a substantially rectangular form. In its installed state, the ceiling truss rests parallel to a gypsum plasterboard, essentially on a suspended drywall ceiling. The surface with which the ceiling truss rests on the gypsum plasterboard is hereinafter referred to as the "bottom surface" or "bottom side," and the corresponding direction as "bottom."The upper side of the ceiling joist, which, when installed, faces the suspended drywall ceiling, is referred to below as the "top surface" or "top side." The joist has at least four sides (surfaces), which are referred to below as the "edge," "edge surfaces," or "side surfaces." The area where two side surfaces or edge surfaces meet is referred to as a corner, analogous to the term "corner of a house," even though edges are formed in a geometric sense. If the edge at a corner is explicitly mentioned, it is referred to as the "corner edge." The actual corners where two side surfaces and either an upper or lower surface meet are referred to below as the "upper corner" or "lower corner."When viewed from above, a ceiling truss is installed in a specific position (top surface at the top and bottom surface at the bottom), and the side surface extending from the corner edge to the right is defined as the "right side surface" and the side surface extending from the corner edge to the left as the "left side surface".

[0008] According to a first embodiment of the present invention, a fitting or bracket for a ceiling truss is provided, which has a generally L-shaped or triangular shape and is configured to be connected to a plate-shaped truss body to form a ceiling truss. In the basic embodiment, the bracket is referred to as a ceiling truss corner bracket. The ceiling truss corner bracket according to the invention has the features of the first claim, with preferred embodiments being described in the dependent claims.

[0009] The ceiling truss corner bracket is designed to be attached to a corner of a truss body, forming a single unit with it. The ceiling truss corner bracket comprises a base body with at least one bearing area, at least one edge area, at least one hook section, and at least one clamping section.

[0010] The at least one bearing area is designed to rest against a truss body from below and support it from below. This bearing area is designed such that, in an installed state or when attached to a truss body, it extends from a region of a lower corner of the truss body (each) along two adjacent lower edges of the truss body. In the case of an installed ceiling truss, the bearing area extends parallel to the suspended ceiling, which ideally runs horizontally. Inclined surfaces can also be represented in this way, with the forces acting on the slope, corresponding to the forces of gravity running down the slope, being absorbed by a screw through the sheathing. It is also possible to arrange them perpendicular to a slope, in which case the inclined forces are absorbed by the supporting profiles.

[0011] The at least one edge region is connected to the at least one support region. The at least one edge region extends from the at least one support region at an angle of substantially 90°. In cross-section, the edge region and the support region form an L-profile. In the case of an installed ceiling truss, the at least one edge region extends perpendicular to a suspended ceiling. In the corner fitting or corner bracket, the edge region extends around the corner at a 90° angle, or two edge regions extend at an angle of (substantially) 90° to each other. The at least one support region and the at least one edge region of the ceiling truss corner bracket essentially form a corner of a box, whereby cutouts and holes are possible.

[0012] The at least one edge region, when installed, extends from the support area along one edge of a truss body towards an adjacent upper corner of the truss body, and from the corner of the truss body away from it, along the adjacent lower edges of the truss body. The at least one edge region terminates in at least one hook section, which is located opposite the support area and is bent outwards. At least one hook section is necessary, but two, three, or four hook sections can also be provided. The at least one clamping section runs from the at least one edge region parallel to the support area. Each clamping section, together with its associated edge region and the support area, essentially forms a U-profile in cross-section.

[0013] The clamping sections and hook sections are arranged offset from each other along an upper edge of the border area. The clamping sections are bent inwards and the hook sections outwards.

[0014] In one embodiment of the ceiling truss corner fitting, it is formed from sheet metal. Preferably, the ceiling truss corner fitting, or ceiling truss corner bracket, is formed from sheet steel. In another embodiment, the ceiling truss corner bracket is manufactured in one piece. In a preferred embodiment, the ceiling truss corner bracket is designed as a folded sheet metal part, or as a stamped, folded, or bent sheet metal part. It is also possible to fold or form the ceiling truss corner bracket from stainless steel or aluminum sheet, although when using stainless steel, the material and processing costs must be considered, and when using aluminum, primarily the material costs. Preferably, the sheet metal part further comprises riveted structures.

[0015] In a further embodiment of the ceiling truss corner bracket, it is formed from a galvanized sheet metal part, preferably a galvanized steel sheet metal part. In another embodiment of the ceiling truss corner bracket, it is galvanized after folding, which has the advantage that all exposed surfaces of the ceiling truss corner bracket are galvanized. It is also possible for the ceiling truss corner bracket to be powder-coated or painted. Powder coating or painting allows for the simple implementation of corrosion protection. It is also possible to cut the ceiling truss corner bracket from a galvanized sheet metal part, fold it, and then, in a further step, protect the bare cut edges with a powder coating or painting, possibly partial.

[0016] In an additional embodiment of the ceiling truss corner bracket, the bearing area is preferably formed as an integral L-shaped sheet metal section, the legs of which are arranged to extend along different lower edges of the truss body. This is the preferred embodiment in which the main force transmitted from the hook section to the truss body is also transmitted along an edge that runs perpendicular to a support profile into which the truss is suspended.

[0017] In another embodiment of the ceiling truss corner bracket, the bearing area is formed as a substantially triangular sheet metal section. This sheet metal section corresponds either directly to a right-angled triangle, or to a right-angled triangle with at least one vertex truncated. The bearing area can be formed in the direction of a (preferably symmetrical) trapezoid whose non-parallel edges are at a 90° angle to each other. Alternatively, the acute angles of the right-angled triangle can be truncated perpendicular to the opposite sides.

[0018] In another embodiment of the ceiling truss corner bracket, the at least one support area is designed as two support areas, each extending from an edge area and forming bent tabs that are configured to support or hold a truss body from below. This embodiment makes it possible to design a continuous edge area that runs around the corner of a truss body, with the support areas extending from the edge area each engaging under the truss body to support or bear it.

[0019] In another embodiment of the ceiling truss corner bracket, the at least one hook section comprises a first section or support section, which is bent outwards and extends in a direction substantially opposite to the support area and the clamping sections, and which runs parallel to the support area and the clamping sections. Preferably, a second section or hook section adjoins the first or support section, extending substantially parallel to the edge area. The first section and the second section, as well as the edge area, together form a downwardly open U-profile in cross-section (whose legs are not of equal length).

[0020] In a preferred embodiment of the ceiling truss corner bracket, the at least one hook-in section also comprises a third section, or inlet section, which is bent outwards. The inlet section facilitates the insertion of the ceiling truss corner bracket, and thus the ceiling truss itself, into a support profile and is only relevant during the installation of the ceiling truss, as it simplifies the process and thus reduces installation time. The inlet slope, or inlet section, forms an angle between 14° and 38°, preferably between 20° and 32°, and more preferably between 24° and 28°, with respect to the respective second section or the edge region.

[0021] In a preferred embodiment of the ceiling truss corner bracket, the second or third section of at least one hook section is also provided with at least one locking section, which faces inwards and is designed to engage behind a fold or crimp of a support profile, thus preventing the hook section from disengaging from the support profile. By appropriately designing the locking section, a wood screw can be driven into a mounted ceiling truss equipped with the ceiling truss corner bracket without the risk of the ceiling truss being lifted out of the support profile. It is presumably sufficient if only one hook section per bracket is provided with a locking section. It is also possible for a ceiling truss to be provided with a locking section on only two diagonally opposite hook sections to ensure adequate functionality.

[0022] The at least one locking section has a contact surface and is inclined from bottom to top inwards towards a center, preferably at an angle between 14° and 38°, more preferably between 20° and 32°, and more preferably between 24° and 28° to a vertical or the nearest edge region. In a preferred embodiment, the locking section is integrally formed with the third section 42, so that the third or entry section can be bent outwards relative to the second section, and the locking section automatically bends inwards. Examples of this can be found in the figures.

[0023] In another embodiment of the ceiling truss corner bracket, it comprises at least two hook sections: a right hook section and a left hook section. The right hook section is configured to lie on the right side of the corner of the ceiling truss when viewed from the installed position, and the left hook section is configured to lie on the left side of the corner of the ceiling truss when viewed from the installed position. Thus, there are at least two hook sections located on different legs of an exemplary ceiling truss corner bracket. Here, at least two hook sections are arranged perpendicular to each other.

[0024] In another exemplary embodiment of the ceiling truss corner bracket, the right hook section has a first (or right) width, and the left hook section has a second (or left) width. In this embodiment, the right hook section is positioned on the ceiling truss corner bracket such that, when installed, the distance from the right hook section to a corner of a ceiling truss (around which a respective ceiling truss corner bracket is to be attached) forms a right-hand corner clearance. Similarly, the left hook section is positioned on the ceiling truss corner bracket such that, when installed, the distance from the left hook section to the corner of the ceiling truss forms a left-hand corner clearance. The difference between the right-hand corner clearance and the left-hand corner clearance should be greater than half the sum of the first and second widths.This ensures that two adjacent ceiling trusses can be placed directly next to each other between two support profiles. With this design, four identical ceiling truss corner brackets can be attached to one truss body, and when ceiling trusses are placed directly next to each other, the hook sections of two adjacent ceiling trusses are offset from one another. If the above condition is not met, a gap forms between two adjacent ceiling trusses that is twice as large as the projection of a hook section of a ceiling truss. Preferably, the first (right) width and the second (left) width are (essentially) the same size, so that the difference between the right and left corner distances must be at least equal to the first (or second) width.Essentially the same size here means within the range of manufacturing tolerances, and smaller than is to be interpreted such that the difference in corner distances between 2 and 20 mm is preferably between 5 and 10 mm.

[0025] In another embodiment of the ceiling truss corner bracket, the bearing area and / or the clamping sections are provided with crimping tabs. The ceiling truss corner bracket is designed to be attached to a truss body. There is a risk that the ceiling truss corner bracket could slip off the truss body. According to this embodiment, this is prevented by crimping tabs, which are designed to be pressed or hammered into the truss body after the ceiling truss corner bracket has been attached. This has the advantage that a positive-locking connection can be achieved without additional fasteners. The truss body can be made of wood or fiberboard, i.e., a material soft enough that a crimping tab can be driven into the material under plastic deformation.

[0026] Here, pre-bent tabs, slightly angled towards the truss body to be joined, are considered crimping tabs. These tabs, created solely by friction, prevent the ceiling truss corner bracket from being pulled away from the truss body, thus ensuring sufficient stability for it to function as a truss. Such a crimping tab would then be referred to as a clamping tongue. A crimping tab has the advantage of requiring no fasteners and can be crimped directly with a hammer or pliers, eliminating the need for additional handling of fasteners.

[0027] It is also planned to provide the ceiling truss corner bracket with clamping structures at contact surfaces, designed to make it difficult to pull the ceiling truss corner bracket off a truss body. The clamping structure can be designed as a sawtooth structure, clamping lugs, gills, or the like, to make pulling it off difficult, but not sliding it on or attaching it.

[0028] According to a further aspect of the present invention, a truss body, preferably made of wood, more preferably of laminated wood, fiberboard, or a composite material, is provided, having essentially the shape of a rectangular plate. The plate of the truss body is provided with recesses at its edges or corners, which are designed to accommodate the bearing surfaces of ceiling truss corner brackets. The recesses are adapted to the shape of at least one bearing surface of four ceiling truss corner brackets. The recesses serve to provide the ceiling truss with a smooth underside so that the ceiling truss can rest smoothly on a gypsum board or fiberboard panel installed underneath. The recesses can be configured at their edges as continuous, rectangular-section milled grooves extending along the lower edges of the truss body.The recesses have a depth corresponding to the thickness of the sheet metal of a ceiling truss corner bracket, ensuring that the corner brackets are flush with most of the truss's surface. The width of the recesses corresponds to the width of the contact areas of the corner bracket perpendicular to its edges, as designed for this truss body. It is also provided that, for example, the areas under the corners are milled into a triangular shape to accommodate a correspondingly shaped corner bracket. The recesses serve to countersink the corner brackets into the underside of the truss body.

[0029] According to a further embodiment of the present invention, a ceiling truss is provided comprising four ceiling truss corner brackets as described above, each of which is attached (and preferably crimped) in the same direction to the four corners of a truss body as described above.

[0030] According to a further embodiment of the present invention, a ceiling truss is also provided, comprising a rectangular sheet metal plate which is bent over by substantially 90° at an edge region on all four sides, wherein at least two opposite bent sides are each provided with at least two hook sections designed to be suspended in the support profiles of a suspended drywall ceiling. Although this embodiment may appear to be something different from the ceiling truss corner bracket, it is actually just a sheet metal plate in which all four corners are formed according to the ceiling truss corner brackets, and these corners are simply not cut out of the sheet metal plate after the corners have been cut and bent over.

[0031] If the ceiling truss has holes, it makes screwing in fastening screws easier.

[0032] In another embodiment of the ceiling truss, it has a two-layer structure, in which the ceiling truss is formed from two layers in the area where it can accommodate screws.

[0033] The two-layer structure is preferably formed from an integral part of a sheet metal blank, which is folded to form the ceiling truss.

[0034] In an additional embodiment of the ceiling truss, one of the layers is provided with reinforcing ribs that improve the structural stability of the ceiling truss. In a further embodiment of the ceiling truss, one layer is provided with reinforcing ribs that counteract deflection. The ribs run parallel to one side of the ceiling truss. It is preferred that the ribs are incorporated into an upper layer of a two-layer ceiling truss. More preferably, the two-layer structure and / or the ribs are formed integrally with the sheet metal plate. In a preferred embodiment of the ceiling truss, the two-layer structure and / or the ribs are connected to the sheet metal plate, which forms an underside of the ceiling truss, by a positive-locking connection such as flanging or clinching, "Toxen™<", or clinching.

[0035] Preferably, the underside of the ceiling truss is formed by a continuous sheet metal plate (also made of perforated sheet metal), while the ribs are formed by another, overlying, corrugated or ribbed sheet metal plate, or also made of perforated sheet metal.

[0036] In a design with two perforated plates arranged one above the other, screws can be screwed through a bottom and a top plate. It may be possible to make the perforation of one of the top plates larger to minimize the screw-in force.

[0037] In one embodiment of the ceiling truss, it is formed from sheet metal. Preferably, the ceiling truss is formed from sheet steel. In another embodiment, the ceiling truss is manufactured in one piece. In a preferred embodiment, the ceiling truss is designed as a folded sheet metal part, or as a stamped, folded, or bent sheet steel part. It is also possible to fold or form the ceiling truss from stainless steel or aluminum sheet, although with stainless steel, the material and processing costs must be considered, and with aluminum, primarily the material costs.

[0038] In a further embodiment of the ceiling truss, it is formed by a galvanized sheet metal part, preferably a galvanized steel sheet part. A powder coating or a paint finish, alone or in combination with a galvanized steel sheet, can easily provide corrosion protection for the ceiling truss.

[0039] In another embodiment of the ceiling traverse, it comprises at least two hook sections, each arranged on opposite edges.

[0040] Hook-in sections can extend across the entire edge, or two hook-in sections can be arranged on each of two opposite sides, so that the ceiling truss can be hooked into a support profile at four points. It is also possible to arrange either one continuous hook-in section on each side of the ceiling truss (i.e., four in total) or at least two hook-in sections per side (i.e., eight in total).

[0041] A hook section comprises a first section or support section, which is bent horizontally outwards. Preferably, a second section or hook section, extending essentially vertically downwards, adjoins the first section or support section. The first section or support section is located at an edge region that is vertically oriented and extends along the edges of the ceiling beam. The first section, the second section, and the edge region together form a downward-opening U-profile in cross-section (whose legs are not of equal length).

[0042] In a preferred embodiment of the ceiling truss, the at least one hook-in section extends into a third section, or lead-in section, which is bent outwards. This lead-in section facilitates the insertion of the ceiling truss into a support profile. The lead-in section is only relevant during the installation of the ceiling truss, as it simplifies the process. The beveled edge or lead-in section forms an angle between 14° and 38°, preferably between 20° and 32°, and more preferably between 24° and 28°, to a vertical.

[0043] In a preferred embodiment of the ceiling crossbeams, the second or third section of at least one hook section is also provided with at least one locking section, which is directed inwards and is designed to engage behind a fold or crimp of a support profile and prevent the hook section from disengaging from the support profile. It is presumably sufficient if only one hook section per bracket is provided with a locking section.

[0044] The at least one hook section can, for example, form an extension of a hook section.

[0045] In another embodiment of the ceiling truss, it comprises at least two hook sections per side: a right hook section and a left hook section. When viewed from the side, perpendicular to a side face of the ceiling truss, the side face is bent upwards at a 90° angle to a lower face of the ceiling truss, forming a rib that provides a significant portion of the ceiling truss's stability. The right hook section is positioned on the right side of the ceiling truss when viewed from the side face in the installed state, and the left hook section is positioned on the left side of the ceiling truss when installed. Thus, there are at least two hook sections located on one side of the ceiling truss. Here, at least two hook sections are aligned with each other.In another version, two hook sections, a right and a left hook section, are arranged on each side.

[0046] In another exemplary embodiment of the ceiling truss, the right hook section has a first (or right) width, and the left hook section has a second (or left) width. In this embodiment, the right hook section is arranged on the ceiling truss corner bracket such that the distance from the right hook section to a right corner of the ceiling truss forms a right corner clearance. Similarly, the left hook section is arranged on the ceiling truss corner bracket such that the distance from the left hook section to a left corner of the ceiling truss forms a left corner clearance. The difference between the right corner clearance and the left corner clearance should be greater than half the sum of the first and second widths. Here, two opposite sides should exhibit a rotational symmetry of 180° in the arrangement of the hook sections.This ensures that two adjacent ceiling beams can be positioned directly next to each other between two support profiles. In this design, the hook sections of two adjacent ceiling beams are offset from each other so that each hook section can engage an adjacent ceiling beam, thus preventing any significant gap between the beams.

[0047] According to another additional embodiment of the present invention, a drywall ceiling is provided with a ceiling truss according to the invention, as described above. The drywall ceiling comprises at least two base profiles attached to a ceiling by means of hangers, to which at least two support profiles are attached by means of cross connectors. According to the invention, at least one ceiling truss, as described above, is suspended between two adjacent support profiles. The ceiling truss is suspended from the adjacent support profiles by means of the hook sections 10. The preferably present snap sections prevent the ceiling truss from being lifted out of the support profiles when a wood screw, a self-tapping universal screw, or a drywall screw is screwed in.

[0048] The preferred type of drywall ceiling is made of gypsum board or fiber-reinforced gypsum plasterboard, which is attached to the supporting profiles with drywall screws. In this type of drywall ceiling, the ceiling joist rests flush with the underside of a gypsum board or fiber-reinforced gypsum plasterboard panel below. With this type of drywall ceiling, loads such as lamps or ceiling lights can be attached to the supporting ceiling joists. The ceiling joist can also be provided with an opening for routing electrical wiring embedded in the drywall ceiling, making it easier to install a light fixture.

[0049] With the ceiling trusses described here, it is possible to directly specify the load-bearing capacity of a ceiling truss based on the grid spacing of the hangers, the respective load-bearing capacities of the hangers or wall fixings, as well as the spacing and load-bearing capacity of the base profiles and the spacing and load-bearing capacity of the support profiles. The design of the ceiling truss according to the invention makes it possible to specify the bearing forces and bearing pressures of the support or hook sections on a support profile. Here, a potential load-bearing capacity of a ceiling truss can be predicted by calculation, taking into account factors such as the modulus of elasticity, the modulus of gravity, and edge distances, as well as the behavior under bending load.

[0050] This makes it possible, for the first time, to design the substructure of a suspended ceiling based on required load-bearing capacities, so that the desired load-bearing capacity can actually be verified at each point through structural analysis. For the first time, it is possible to provide load-bearing capacities according to desired specifications right from the design stage of a suspended ceiling, without having to resort to makeshift solutions. One way to perform structural calculations also eliminates the need to anchor a ceiling beam directly to the ceiling using separate hangers.

[0051] The present invention is described below by means of schematic representations of preferred embodiments. Figure 1 represents an isometric view of a basic embodiment of a ceiling truss corner bracket. Figure 2Figure 1 shows an isometric view of a preferred embodiment of a ceiling truss corner bracket which makes it possible to suspend a ceiling truss equipped with this ceiling truss corner bracket in two different positions in support profiles. Figures 3A and 3B Each shows a top view and a side view of the ceiling traverse corner bracket. Figure 2 . Figure 4 represents a development of a ceiling truss corner bracket according to the Figure 2 dar. Figures 5A and 5B Each shows a top view and a bottom view of a ceiling truss according to the invention with the ceiling truss corner brackets of the Figure 2 . Figure 6 shows a perspective view of a drywall ceiling with a ceiling traverse according to the invention, before the plasterboard panels are attached. Figure 7A and 7D Each shows different views of a one-piece ceiling truss according to the invention.

[0052] In the following, both in the description and in the figures, the same or similar reference symbols are used to refer to the same or similar components and elements.

[0053] Figure 1Figure 1 shows an isometric view of a basic embodiment 20 of a ceiling truss corner bracket. The arrow indicates the direction from which the ceiling truss corner bracket is to be viewed to determine the "right" and "left" sides; here, a side view in the plane of a support area 4, which points from the outside towards the corner of the ceiling truss corner bracket. The support area 4 is shown in the isometric view from above, i.e., with the surface on which a ceiling truss body is to rest on the support area 4. Extending from the support area 4 are two edge areas 6, each (essentially) perpendicular to each other and to the support area 4. The two edge areas 6 and the support area 4 thus meet at a lower corner. The edge where the two edge areas 6 meet forms the corner edge or simply "corner".The ceiling truss corner bracket is designed to enclose a lower corner of a ceiling truss body on three sides. The ceiling truss corner bracket is clamped to the ceiling truss body by the clamping tabs 8, thus ensuring a positive connection. Additionally, the clamping tabs 8 are provided with crimping tabs 40, which can be driven into a ceiling truss body made of a softer material than the ceiling truss corner bracket under plastic deformation. The ceiling truss corner bracket also features a hook section 10 that projects upwards from the left edge region 6, then outwards, and finally curves downwards again. The left edge region 6 is wider than the right edge region and includes two clamping tabs 8. The right edge region 6 is shorter and includes only one clamping tab 8 and no hook section.The design of this version 20 of the ceiling truss corner bracket requires the use of two mirror-symmetrical ceiling truss corner brackets to securely attach a ceiling truss with four hook sections to support profiles. The [details omitted] Figure 1 The illustrated embodiment 20 of the ceiling truss corner bracket can be folded or bent from a sheet metal blank or a stamped sheet metal part. Mirror-symmetrical versions can be produced from identical stamped sheet metal parts by folding all bends in the opposite direction.

[0054] Figure 2Figure 2 shows an isometric view of a preferred embodiment of the ceiling truss corner bracket 2, which allows a ceiling truss equipped with these corner brackets to be suspended in support profiles in two different positions. Here, it is provided that these ceiling truss corner brackets utilize a ceiling truss body comprising a rectangular plate whose length and width correspond to various common support profile spacings. Thus, one ceiling truss can be used for two different support profile spacings, requiring only one type of ceiling truss to be kept in stock.

[0055] The ceiling truss corner bracket 2 has a substantially L-shaped support area 4, from which two edge areas 6 project perpendicularly to each other and to the support area 4 on the outer sides. The edge areas 6 are provided with clamping sections 8 near the corner and at the ends. The support area 4, the edge areas 6, and the clamping sections 8 are symmetrical with respect to a plane that passes through the corner edge and in which the bisector of the angle between the two edge areas 6 lies. In the present embodiment of the ceiling truss corner bracket 2, the two hook sections 10 are arranged at different distances from the corner edge. This makes it possible to join four such ceiling truss corner brackets 2 with their corner edges together in such a way that a right edge area 6 of one ceiling truss corner bracket 2 rests flatly or substantially over its entire surface against a left edge area 6 of an adjacent ceiling truss corner bracket 2.For this to work, the distance of a right hook section 10 from the corner edge must differ from the distance of a left hook section 10 to the corner edge by a factor greater than the arithmetic mean of the respective widths of the right hook section and the left hook section 10. Under this condition, it is ensured that the hook sections 10 are offset from each other in such a way that two adjacent ceiling trusses can be suspended side by side between two adjacent support profiles. It may also be necessary to define that the hook sections 10 of a ceiling truss corner bracket 2 should extend completely above the top surface of a ceiling truss body for which the ceiling truss corner bracket 2 is intended, since otherwise, for example, an entry section of a hook section 10 would abut the ceiling truss body of an adjacent ceiling truss body.

[0056] In a simple design, the hook sections can also be arranged symmetrically.

[0057] Figure 3A represents a top view of a ceiling truss corner bracket 2 according to Figure 2The view has been slightly modified to better illustrate the course of the support area 4, the edge areas 6, the clamping sections 8, and the two hook sections 10. For this purpose, the width of the support area 4 was slightly increased and the position of the crimping tabs 40 was changed. In the top view, the support area 4 forms the lowest plane. From the support area 4, the left edge area extends vertically upwards from the plane of the drawing. In the figure below, the right edge area extends vertically upwards from the support area 4. From the left edge area, the left clamping tabs 8 extend to the right, parallel to the plane of the drawing. From the right edge area, the right clamping tabs 8 extend upwards, parallel to the plane of the drawing.

[0058] The support area 4 and the clamping tabs 8 are provided with crimping tabs 40 formed by U-shaped cutouts. After the ceiling truss corner bracket 2 has been slid onto a corner of a ceiling truss body, the crimping tabs 40 of the support area 4 can be driven upwards and the crimping tabs 40 of the clamping tabs 8 can be driven or pressed into the material of the ceiling truss body to fasten the ceiling truss corner bracket 2 to the ceiling truss body without nails or screws. However, the crimping tabs 40 are only optional, and it is emphasized that the ceiling truss corner bracket 2 can also be glued to a corner of a ceiling truss body.

[0059] The hook sections 10 originate directly from the respective edge area and are bent outwards and further downwards. In the Figure 3AThe different corner distances of the hook sections 10 to the corner edge are most easily seen. The left hook section 10 has a chamfer marked with reference numeral 42.

[0060] The Figure 3B Figure 1 shows a side view of the ceiling truss corner bracket 2, focusing on the right edge region 6, which lies within the plane of the drawing. A bending line to the support area 4 is visible below, which also projects slightly beyond the right side of the figure. The support area 4 extends into the plane of the drawing. The right edge region is obscured by the left edge region and also extends perpendicularly into the plane of the drawing. Opposite the support area 4, the clamping tabs 8 extend perpendicularly to the plane of the drawing.

[0061] From the right edge area 6, the right hook section 10 projects upwards out of the plane of the drawing towards the viewer. From the hidden left edge area 6, the left hook section 10 extends upwards. A first section of the hook section 10 extends to the left. This first section, or support section, forms a bearing surface with which the ceiling truss corner bracket 2 can rest on a support profile. A second section, or hook section, of the hook section 10 is bent downwards and prevents the first section from slipping off a support profile. A third section, bent outwards as the entry section 42, adjoins the second section and facilitates the insertion of the hook section 10 into a support profile. A snap-in or locking mechanism can be attached to the entry section 42.Barbed section 44 is arranged which, when hooked into a support profile, engages with it and prevents hook section 10 from disengaging from the support profile. In the . Figures 3A and 3B The inlet sections 42 and the locking sections 44 are integrally formed; therefore, it is emphasized that it is also possible to design these two components separately.

[0062] Figure 4 shows a view of a stamped sheet metal part used for the ceiling truss corner brackets of the Figures 2 to 3Bcan be folded. In contrast to the figures, the inlet sections 42 and the locking sections 44 on the left side of the figure are shown in a different embodiment. In the figure, fold lines are shown as dashed lines, indicating where an upward fold out of the plane of the drawing is to be made. Fold lines shown as dashed lines indicate downward folds into the plane of the drawing. The fold lines on the left side are labeled with degree markings to indicate the degree by which the sheet metal is to be folded at the respective fold line.

[0063] Figures 5A and 5B show an upper and lower view of a ceiling traverse 30 according to the invention. Figure 5AFigure 3 shows an upper view from the inside of the ceiling truss 30. Here, the clamping tabs hold the ceiling truss corner brackets 2 on the ceiling truss body 34. The ceiling truss corner brackets 2 are secured against being pulled off by the crimping tabs. The hook sections 10 protrude laterally and upwards from the plane of the drawing. The top surface of the ceiling truss body 34 is smooth and flat.

[0064] Figure 5bThis is a bottom view of the ceiling truss 30. Here, the bearing areas support the ceiling truss body 34 from below. The bearing areas of the ceiling truss corner brackets 2 are recessed in the lower side of the ceiling truss body 34 in recesses designed as circumferential edge milling or cutouts. The ceiling truss body can also be milled only in the area of ​​the bearing areas, which would allow a larger bearing surface against an underlying plasterboard panel. Here, too, the crimping tabs can secure the ceiling truss corner bracket 2 against being pulled out. The hook sections 10 are shown from below, and the entry sections as well as the locking sections are visible.

[0065] Figure 6Figure 1 shows a perspective view of a drywall ceiling with a ceiling crossbeam 30 according to the invention, before the gypsum plasterboard panels are attached to the support profiles 66. The drywall ceiling is arranged in a room comprising a ceiling 50, a rear wall 52, a left wall 54, and a right wall 56. The edges of the room are shown as thick dashed lines. Base profiles 62 are attached to the ceiling by means of hangers. The base profiles 62 run parallel to the rear wall 52. Two support profiles 66 are attached to the base profiles 62 by means of cross connectors. The support profiles 66 run parallel to the side walls 54 and 56. The middle of the support profiles 66 is cut off to show a substantially U-shaped cross-section of the support profiles, wherein the support profiles 66 have a fold or a crimp at the top to reinforce the sides of the profile.

[0066] A ceiling crossbeam 30 is suspended between two adjacent support profiles 66 at the edges of the support profiles. The locking sections of the hook-in sections engage with the folded or crimped edges of the support profiles 66, thus preventing the ceiling crossbeam 30 from lifting or disengaging when a load is applied from below. This allows wood screws, universal screws, or self-tapping screws to be screwed directly into the ceiling crossbeam 30 without pre-drilling, in order to attach lighting systems or multimedia components to the drywall ceiling.

[0067] Figure 7A Figure 8 shows a lower view of a one-piece ceiling truss 84 according to the invention, which is bent from sheet metal. Here, the lower side of the ceiling truss is shown as a rectangle. At the lower left corner, the area is marked by a thin dashed line, which is separated from the bearing area of ​​the ceiling truss corner bracket according to the Figures 2 to 4would be occupied. The one-piece ceiling truss 84 has the advantage that, due to its surface perforation, the entire lower surface of the one-piece ceiling truss 84 is available for screwing in fastening screws. As in the Figure 5B Here too, the hook-in sections protrude laterally across the surface of the ceiling truss. In a basic design, the corner areas correspond to the ceiling truss corner brackets of the Figures 2 to 4 , whereby clamping sections can be saved. However, it is also possible to attach further reinforcements to the back of the one-piece ceiling truss 84. The term "one-piece" is used in the Figures 7A to 7D to be understood as meaning that all essential components are manufactured from a single sheet metal part, within the scope of the execution of the Figures 7A to 7CHowever, fasteners such as rivets, pop rivets, explosive rivets, spot welds, or bolted connections may also be included, provided that the same result can be achieved by other one-piece joining methods, such as clinching or "Toxen tm<" or similar. Fasteners that are only used to circumvent the "one-piece" requirement should therefore still be considered to fall under the "one-piece" requirement for the ceiling truss.

[0068] Figure 7B represents a version of the one-piece ceiling truss 84 of the Figure 7Ain an improved design. The back or top surface of the one-piece ceiling truss 84 is also made of perforated sheet metal, although this is not shown for clarity. Here, the sheet metal forming the underside of the ceiling truss is a rectangularly folded corrugated sheet, which gives the ceiling truss increased stability. The corrugations form ribs that significantly reinforce the ceiling truss in the direction of the ribs. The corrugated sheet is relatively shallow, which means that when using relatively long fastening screws, they are screwed to both layers, thus improving the stability of the ceiling truss and the screw connection. Furthermore, it is possible to connect the two layers—the underside and the corrugated sheet—to each other using fasteners such as rivets.Preferably, the underside sheets and the "corrugated sheet" are joined together by a process such as clinching, which does not require any additional fasteners.

[0069] Figure 7C shows a development of the one-piece ceiling truss from Figure 7B , in which the reinforcement on the back and the ceiling crossbar, as well as all other components, such as the hook sections, can be formed from a single sheet of metal.

[0070] Figure 7DThis diagram shows an isometric partial view of a corner of a ceiling beam or corner bracket. The bearing area is concealed by the sheet metal parts that form the edge. Here, the bearing area, or underside of the beam, is formed in one piece. The edge sections are bent upwards from the bearing area or underside. Conventionally, the bearing areas would butt against each other flush. Here, the butt edges are designed to create a kind of interlocking action, allowing the two adjoining edge sections to engage. The dashed lines indicate that the engagement surfaces can also be brought into frictional engagement by crimping along the lines. On the top side, the clamping sections or reinforcing folds have been extended to meet.To improve force transmission at the corner, the corner area is stepped rather than mitered. Under a load transmitted by the interlocking sections, the interlocking mechanism can now also transmit forces along the side edges of the ceiling beam. Reference symbol list

[0071] 2 Ceiling truss corner fitting or ceiling truss corner bracket 4 Support area 6 Edge area 8 Clamping section 10 Hook-in section 20 Ceiling truss fitting or ceiling truss corner bracket in basic design 30 Ceiling truss 34 Truss body 36 Recesses 40 Riveting tab 42 Inlet section 44 Snap-in section 50 Ceiling 52 Back panel 54 Right wall 56 Left wall 60 Hanger 62 Base profiles 64 Cross connector 66 Support profiles 84 One-piece ceiling truss

Claims

1. Ceiling truss corner bracket (2) configured to be attached to a corner of a truss body (34) to form a ceiling truss (30) with the truss body (34), wherein the ceiling truss corner bracket (2) comprises a base body which has at least one support area (4) that is configured to abut against a truss body (34) from below and to support it from below, wherein the support area (4) is further configured to extend from an area of a lower corner of the truss body (34) along two adjacent lower edges of the truss body, and has at least one edge area (6), wherein the at least one edge area (6) is connected to at least one support area (4), and wherein the at least one edge area (6) extends from the support area (4) at an angle of substantially 90 ° and is configured to extend from each the support area (4) along the one edge of a truss body (34) and a corner of a truss body (34) along its edges, wherein the at least one edge area (6) ends in at least one hook-in section (10) which is arranged opposite the support area (4) and is bent outwards, wherein the ceiling truss corner bracket (2) further comprises at least one clamping section (8) which extends from the at least one edge area (6) and runs parallel to the support area (4).

2. Ceiling truss corner bracket (2) according to claim 1, wherein the ceiling truss corner bracket (2) is designed as a single piece, and is preferred to be made of a sheet metal part, preferably a steel sheet metal part, and is most preferably designed as a folded sheet metal part, preferably as a folded steel sheet metal part.

3. Ceiling truss corner bracket (2) according to claim 2, wherein the ceiling truss corner bracket (2) is formed by a galvanized sheet metal part, preferably a galvanized steel sheet metal part, or wherein the ceiling truss corner bracket (2) was galvanized after folding, and / or wherein the ceiling truss corner bracket (2) is powder-coated or painted.

4. Ceiling truss corner bracket (2) according to claim 1, 2 or 3, wherein the support area (4) is preferably formed by an integral L-shaped sheet metal section, the legs of which are configured to extend along each different lower edges of the truss body, or formed by a substantially triangular sheet metal section, or formed by at least two tabs extending from an edge area (6).

5. Ceiling truss corner bracket (2) according to one of the preceding claims, wherein the at least one hook-in section (10) comprises a first section that is bent outward and extends in a direction substantially opposite to the support area (4) and the clamping sections, and runs parallel to the support area (4) and the clamping sections, and more preferably comprises a second section that extends substantially parallel to the edge area (6).

6. Ceiling truss corner bracket (2) according to claim 4, wherein the at least one hook-in section (10) further comprises a third section (42) which adjoins the second section of the hook-in section (10) and is bent outward, preferably at an angle between 14 ° and 38 °, preferably between 20 ° and 32 °, more preferably between 24 and 28° to the second section or the edge area (6).

7. Ceiling truss corner bracket (2) according to claim 5 or 6, wherein the at least one second section or the third section of at least one hook-in section (10) is further provided with at least one snap-in section (44), wherein the at least one hook-in section (10) forms a contact surface and is inclined inwardly extending from bottom to top, preferably at an angle between 14 ° and 38 °, preferably between 20 ° and 32 °, and more preferably between 24° and 28°, wherein the snap-in section (44) is preferably formed integrally with the third section (42).

8. Ceiling truss corner bracket (2) according to one of the preceding claims, wherein the ceiling truss corner bracket (2) comprises at least two hook-in sections (10), a right hook-in section and a left hook-in section, wherein the right hook-in section is configured to lie on a right side of a corner of a ceiling truss in a mounted state and wherein the left hook-in section is configured to lie on a left side of a corner of a ceiling truss in a mounted state.

9. Ceiling truss corner bracket (2) according to claim 8, wherein the right hook-in section has a first width and the left hook-in section has a second width, wherein the right hook-in section and the left hook-in section are arranged on the ceiling truss corner bracket (2) such that a right corner distance of the right hook-in section from a corner of a ceiling truss differs from a left corner distance of the left hook-in section from a corner of the ceiling truss by at least half the sum of the first and second widths, wherein preferably the first and second widths are substantially equal.

10. Ceiling truss corner bracket (2) according to one of the preceding claims, wherein the support area (4) and / or the clamping sections (8) are provided with caulking tabs (40) which are configured to be caulked to a truss body (34) after the ceiling truss corner bracket (2) has been fitted onto it, or are provided with clamping tongues which are bent in the direction of a truss body (34), or are provided with clamping structures which are configured to make it difficult to pull the ceiling truss corner bracket (2) off a truss body (34), preferably formed as a sawtooth structure, clamping noses and the like, however, without making a sliding-on or fitting more difficult.

11. Truss body (34), preferably made of wood, more preferably made of laminated wood or a fiberboard or a composite material, for use with one or more ceiling truss corner brackets (2) according to one or more of claims 1 to 10, comprising a substantially rectangular plate provided at lower edges with recesses (36) which are configured to receive support areas (4) of ceiling truss corner brackets (2), wherein the recesses (36) are preferably designed as rectangular milled-out portions in cross-section along the lower edges of the truss body (34), which have a height corresponding to a thickness of a sheet metal material of a ceiling truss corner bracket (2) and a width corresponding to the width of the support areas (4) of the ceiling truss corner bracket (2) intended for this truss body (34).

12. Ceiling truss (30) comprising four ceiling truss corner brackets (2) according to one of claims 1 to 10, each of which is attached to the corners of the truss body (34) according to claim 11.

13. Ceiling truss (30) comprising a rectangular sheet metal plate which is bent at all four sides at an edge area by substantially 90° in each case, wherein at least two opposite bent sides are each provided with at least two hook-in sections which are configured to be hooked into support profiles of a suspended drywall ceiling, wherein the sheet metal plate is preferably provided with a perforation that facilitate the screwing in of sheet metal screws, and wherein the ceiling truss is preferably designed as a single piece.

14. Ceiling truss (30) comprising a rectangular sheet metal plate, further comprising a two-layer structure, and / or reinforcing ribs, wherein the two-layer structure and / or the ribs are formed integrally with the sheet metal plate, and wherein the two-layer structure and / or the ribs are more preferably connected to the sheet metal plate by a form-fit connection, such as flanging or clinching.

15. Drywall ceiling provided with a ceiling truss (30) according to any one of claims 12 to 14, wherein the drywall ceiling comprises at least two base profiles (62) attached to a ceiling (50) by hangers (60), to which at least two support profiles (66) are attached by cross connectors (64), wherein at least one ceiling truss (30) according to one of claims 12 to 14 is suspended between two adjacent support profiles (66), which is hooked onto the adjacent support profiles (66) by hook-in sections (10), wherein the drywall ceiling is preferably provided with plasterboard or fiber-reinforced gypsum boards, which are attached to the support profiles (66).

Images