FR2970012A1 - Primary framework profile for false ceiling suspension on support structure e.g. floor, has lower sole comprising fixing heads that are projected from sole on side opposite to core to produce snap with C-shaped channel part - Google Patents

Abstract

The profile has a central core (2), and a lower sole (4) positioned at a base of the profile for forming a support to the core. The lower sole comprises a set of fixing heads (6) projected from the lower sole on a side opposite to the core to produce a snap with a C-shaped channel part. The fixing heads are distributed regularly over entire length of the profile. The lower sole includes an inner layer, which is positioned near a side of the core, and an external layer, where each fixing head is made by cutting the external layer. An independent claim is also included for a false ceiling suspension, comprising a primary framework profile support and a secondary framework profile support.

Description

The present invention relates to a profile for primary false ceiling frame and generally the suspension of a false ceiling to any support structure, such as floor or slab. It is more particularly the case where such a suspension uses two different frames, primary and secondary, each formed of a network of parallel sections may have different profiles in section. The primary framing profiles may have different profile sections of the secondary framing profiles and are arranged perpendicular to said primary framing profiles.

In the usual way, the profiles of the primary framework are suspended by suspension lines to the structure of the support. The secondary frame, whose profiles arranged perpendicular to the previous ones, are themselves mounted on those of the primary frame. The profiles used to make the primary framework may have in section various profiles, such as L-neck They most often have a bottom flange, that is to say a flat support part intended for s extending in a plane parallel to that of the support structure, an upper sole, that is to say a flat part cooperating with a hanger, and a core, or middle part, connecting the lower sole to the sole superior and participating in the rigidity of the profile. The bottom flange is intended to be remote from the support structure in the mounted position while the upper flange is intended to be disposed on the side of the support structure in the mounted position. In order to make the primary structure benefit from the reinforcement effect due to the false ceiling, the profiles of the secondary framework are generally connected to those of the primary framework by screws, or sometimes by means of a connection device that can take the shape of a loop or a stirrup. Alternatively, as shown in the document FR-2 726 592, the profiles of the primary framework may have several cutouts notching in the joint their soul and their lower sole, each of which is formed by at least one shoulder turned on the side of the head of the profile. These cutouts allow the coupling of a section of the secondary frame by means of an adaptation hanger having, at its upper part, at least one leg by which is able to be hooked on a shoulder of this fur frame, and, at its lower part, a head, by which it is adapted to engage with a secondary structural section. When making the profiles of the primary framework, the number of cuts must be limited to maintain good rigidity to the profile. This limits the possible positions of the profiles of the secondary frame relative to the primary frame. The present invention aims to provide a structure for limiting its exposure time. It is thus proposed to increase the range between two suspension points of a profile of the primary framework in order to limit the number of hangers and thus gain installation time and / or offer significant flexibility in the positioning of profiles of the secondary framework with respect to the primary framework. To this end, the present invention provides a profile for primary false ceiling frame comprising a core and, at its base, a flat portion, called bottom flange, forming a support.

According to the present invention, the bottom flange comprises at least one fixing head projecting from the opposite side to the core of the profile and intended to snap into place with a profiled piece C. The use of such a profile in a frame allows to cross large ranges, and / or minimize the number of anchor points to provide in the support structure, and therefore the number of corresponding settings. Advantageously, the projecting mounting head is in one piece with the profile, which simplifies the installation by limiting the number of parts required. To ensure a better mechanical resistance to the entire structure, the profile preferably has an I-profile. According to a preferred embodiment because economic, the lower flat part of the profile has two thicknesses, one on the side of the so-called inner soul, and the so-called outer one. Each projecting fastening head is then preferably made by cutting the lower thickness of the lower flat portion. To produce a grid suspension, the profile comprises fastening heads evenly distributed over the entire length of its bottom flange. In order to obtain a different distribution of the load on the profile, the fixing heads are for example composed of pairs of ends of the fixing head.

According to a second aspect, the present invention also relates to a false ceiling suspension comprising a grid network of support profiles formed, on the one hand, of a primary framework of support profiles which are intended to be suspended from hangers and, secondly, a secondary framework of support profiles, which are arranged in place between the primary framework sections, perpendicular to them, comprising at least one profile as described above. Such a false ceiling suspension is preferably characterized in that the profiles of the primary framework have an I-shaped profile, in that said false ceiling suspension further comprises suspensions carrying the primary framework, in that each suspension comprises, on the one hand, a threaded rod and on the other hand a hanger foot, in that each hanger foot comprises a support wall intended to be fastened to the threaded rod, in that the support wall is extended in two parallelogram-shaped wings extending from the support wall divergently and each provided with a return directed inwardly of a volume embraced by the support wall and the planes of the wings. In addition for a better cooperation between the profiles of the primary frame and the hanger legs, it is advantageously provided that the profiles of the primary frame have an upper sole with a wing return to each free edge of said sole, and that the returns of the hanger feet each have a housing for receiving the free end of a wing return. Other details and advantages of the present invention will appear on reading the following description, which refers to the attached schematic drawings and relates to preferred embodiments, provided as non-limiting examples. In these drawings: FIG. 1 represents a cross-sectional view of a profile according to the invention; FIG. 1 'is a view similar to that of FIG. 1 for an alternative embodiment of a profile according to the invention; FIG. 2 shows a side view of the profile of FIG. 1 or 1 'and a fur, FIG. 3 shows in bottom view of the profile of FIGS. 1 and 1', FIG. 4 shows a side view of FIG. FIG. 5 shows a bottom view of the profile of FIG. 4, FIG. 6 is a sectional view on an enlarged scale showing the cooperation of the section of FIG. 1 with a view of the profile of FIG. Figure 7 is a detail view of a section such as the section of Figure 6 showing an alternative embodiment of the hanger foot of Figure 6, Figure 8 is a view similar to that of Figure 7 for another alternative embodiment of the hanger foot, Figure 9 is a sectional view of a e another alternative embodiment according to the invention embodying another embodiment of a profile according to the invention and a hanger foot adapted to this embodiment of the profile, and Figure 10 illustrates a frame implementing profiles according to the present invention. FIG. 1 represents a profile 1 comprising a central core 2 and a bottom flange 4 at the base of this central core 2. The profile 1 of FIG. 1 has an I profile according to a first embodiment of the invention, but it is not excluded to use another form of profile including a central core and a lower sole or a lower wing. The lower flange 4 has two flanges 5 on either side of the central core 2, one on each side thereof, and at least one fixing head 6 extending from the lower flange 4, substantially in the extension of the central core 2. In practice, the lower sole 4 has two thicknesses, one on the side of the so-called inner soul, and the other said outer. The fixing head 6 is made by cutting and then folding the outer thickness of the lower flange 4. In another embodiment of the section shown in Figure 1 ', it will be noted that the core 2 has a housing 12 allowing to insert the fastening heads 6 of a neighboring profile during transport and storage of several profiles.

The shape of the fixing head 6, shown in particular in FIG. 2, is known to those skilled in the art. It is intended to allow the nesting of a fur 9, that is to say a profiled piece having a section C, known to those skilled in the art for example under the name F530, made of galvanized steel and used in particular for the constitution of ceiling frames and doubling.

A fur 9 thus has a flat bottom of which extend two lateral flanks, each side flank having at its free end an end flange 11 folded at right angles to the inside of the fur. The dimensions of such a fur are generally 5300 mm in length (corresponding to the length of the flat bottom), 45 mm in height (corresponding to the width of the flat bottom), 18 mm in width (corresponding to the height of the lateral flanks or substantially at the distance between the flat bottom of the end flanges 11) and 0.75 mm of material thickness and are customary for those skilled in the art. Each fastening head 6 has a substantially flat and generally rectangular shape adapted by cutting to receive a fur. Each cutout forms on the side of the core 2 notches 7 each intended to receive an end flange 11 of a side wall of a fur 9. On the opposite side to the core 2, the cuts made to form the head 6 are rounded at the corners. This rounded shape allows to engage an end flange 11 of a side flank of a fur 9 in a pair of notches 7 by pivoting. In a preferred embodiment, the section 1 of FIG. 1 also comprises an upper flange 8, parallel to the bottom flange 4. In the embodiment shown in FIG. 1, each of the ends of the upper flange 8 has a return of wing 10 obliquely relative to the upper sole 8. In particular, these wing returns are arranged to move away from the core, forming with the upper sole 8 an angle of between 90 ° and 180 °, preferably between 90 ° and 135 ° and forming for example an angle of 120 ° as shown in Figure 1.

In a preferred embodiment, the section 1 is obtained by cutting and folding a sheet. The wing returns 10 form edges of the sheet used to form the profile 1. The sheet is folded so that the web 2 and the bottom plate 4, as illustrated in FIGS. 1, 1 'and 9, present a double sheet thickness while the upper sole 8 has a single thickness. As an indication, these values being in no way limitative of the invention, the height of the profile is 100 mm and its width 45 mm, the sheet used being for example a 0.6 mm thick steel sheet. thickness. As can be seen in FIG. 3, several fastening heads 6 are advantageously cut regularly along the section 1, for example on an axis of symmetry XX 'of the bottom flange 4. The pitch provided for the production of two consecutive cuts is for example 100 mm. In a second embodiment illustrated in FIGS. 4 and 5, two ends of fixing heads 14a, 14b replace the fastening heads 6 along a section 1. These ends of fastening heads 14a, 14b consist of the part end of a fixing head 6 having the notch 7 and the rounded cut portion. There are also two types of attachment head ends, an end called "left" end and an end called "right" end.

They are cut in pairs, "left" and "right", and folded so as to be arranged each on the axis of symmetry XX 'of the lower sole 4, the pairs of cuts being advantageously distributed regularly along the profile 1, for example with here also a pitch of 100 mm between two pairs of cuts. Thus, a pair of ends of fastening heads 14a, 14b can, like the fastening heads 6, receive the end edges of the side walls of a profile such as a fur F530, while distributing different the load on the profile 1. The section 1 of the false ceiling primary frame described above is suspended via at least one hanger. A hanger generally consists of a rod and a hanger foot such as the hanger feet described below with reference to Figures 6 to 10. Reference is made here to document FR-2,830,554 which describes a hanger foot can also be used for the suspension of a profile as described above. The contents of this document are incorporated in the present description by reference.

As can be seen in Figure 10, a hanger foot 16 proposed here to cooperate with a profile as described above is of the same type as the hanger feet described in the document FR-2,830,554 cited above. It is indeed a "quarter-turn" hanger foot whose assembly is easy because it is sufficient to rotate the hanger foot around its rod about 90 ° to make it pass from a disassembled position to a mounted position or vice versa. Such a hanger foot 16 is intended to cooperate with a threaded rod 32 shown diagrammatically in FIG. 10. A hanger foot 16 firstly comprises a support wall 20 intended to cooperate with a threaded rod 32 via a tapping 22 made at a sander formed in the center of the support wall 20. It further comprises two flanges 18 which extend divergently from the support wall 20. While in the document FR- The wings (references 12 and 13) are in two parallel planes, the wings 18 of the present suspension foot are in planes forming a dihedron. By cons, if we consider the direction given by the fold line between the support wall and the wings, it is noted, as for the hangers of document FR-2 830 554 that a wing 18 extends according to this direction in one direction while the other wing extends in the same direction but in the opposite direction.

Each of the wings 18 is provided with a return 24 directed inwards with respect to the volume embraced by the support wall 20 and the planes of the wings 18. With respect to the suspension legs of the prior art (FR-2,830,554 ), we do not find on the legs of proposed suspension here the brackets (references 16 and 17 in the document FR-2 830 554). On the other hand, it is also proposed here to make the hanger foot 16 by cutting and folding a sheet. The shape of the cut blank which makes it possible to obtain the hanger foot 16 is not represented here but its shape corresponds substantially to a few adaptations close to the shape shown in FIG. 4 of the document FR-2 830 554. FIG. 6 illustrates a cooperation between a profile such as that shown in Figure 1 and a hanger foot 16 in the mounted position of the hanger foot. It is assumed that the support wall 20 is in a horizontal plane, above the profile. The core 2 of the profile extends in turn in a vertical plane. Such an orientation is retained for the rest of the description. The wings 18 are arranged in a plane forming an angle R with the vertical as illustrated in FIG. 6. For the suspension legs of the prior art (FR-2,830,554), the angle R is 0 °. It is proposed here an angle of about 15 °, or more generally an angle of between 2 ° and 30 °. However, there is here, as for the wings of the hanger foot of the prior art, wings of global shape parallelogram.

A fold is made between each wing 18 and the corresponding return 24. It is intended to take place at the free end of a wing return 10 of the profile. Each return 24 is adapted so that the free end of said return 24 is housed at a fold formed between the core 2 of the profile and its upper sole 8. Thus the return 24 forms with the An angle is shown in Figure 6. The value of this angle depends on the dimensions of the upper flange 8, on the one hand, and the dimensions of the wing return 10, on the other hand. Figures 6 to 8 provide that the free end of each return 24 has a gutter shape 25 extending over the entire length of the return 24. The concavity of the gutter 25, in the mounted position of the hanger foot, is oriented towards the top, that is to say towards the support wall 20. A not shown hole is advantageously provided to allow the passage of a screw 26 for fixing the profile on the hanger foot 16.

Figures 7 to 9 show alternative embodiments of the embodiment of the hanger foot of Figure 6 which allow better cooperation between the profile and the hanger foot. FIG. 7 proposes to carry out, for example by stamping, at least one projection 28 projecting on the upper face of a return 24 so that the free end of the wing return 10 comes to be housed between said boss 28 and the the lower end of the wing 18. The boss 28 may be a "punctual" boss or it may be an "elongated" boss which then extends along the fold line between the flange 18 and the return 24 on all or part of the length of this fold line.

In the embodiment of Figure 8, the boss 28 of Figure 7 is replaced by a tongue 30. The latter is for example cut in the return 24 and folded so that its free end points to the flange 18. Here too, as for the boss 28, the free end of the wing return 10 is intended to take place between the tongue 30 and the corresponding wing 18. The tongue 30 may be of small width. In this case, one can provide several tabs or the tongue has a width corresponding to all or part of the width of the corresponding return 24. The boss 28, as well as the tongue 30, have the function of holding the hanger foot 16 on the profile when it is mounted on it. The hanger foot 16 takes place by pivoting relative to the profile. The bosses 28 and the tongues 30 on the returns 24, in combination with the inclination relative to the horizontal of the returns 24 allow a mounting with passage of a hard point and disassembly difficult to achieve by simple pivoting into reverse. Here a snap-fastener of a type known to those skilled in the art is produced with a relatively easy assembly and disassembly much more difficult. In the embodiment of FIG. 9, there is greater conformance between each return 24 and the upper flange 8 of the profile, whose shape is adapted. In the embodiment of Figure 9, the profile substantially corresponds to the profile shown in Figure 1 but with an angle of 90 °. The return 24 comprises a groove in which the wing return 10 is housed. This concordance of shapes between the upper sole 8 and the foot of 10 hanger 16 allows of course to limit the clearance between the hanger and the profile. This is the preferred embodiment of the present invention. Figure 10 illustrates various components of a ceiling frame. There are two profiles 1 forming the primary structure of said framework. These profiles are carried by lines. In this figure 10, two 15 feet of hanger are mounted on a profile 1 and two other hanger legs 16 are illustrated in exploded view to better understand the general shape of the corresponding hanger legs 16. Two furs 9 are also partially represented. The dotted lines symbolize the extension of the represented fur segments. In this figure, the fixing heads 6 are shown unfolded, that is to say extending perpendicular to the lower flange of the corresponding section 1. However, it is conceivable to provide for cutting the fastening heads without unfolding them, that is to say that the fixing heads are delivered to the end user in the same plane as the lower sole. The user then unfolds at will the fixing heads 6 he needs. This has a twofold advantage: to facilitate the packaging and transportation of the profiles and to avoid having fastening heads forming protrusions at the base of the profile which can be troublesome when producing a false ceiling. It will be apparent to those skilled in the art that it can simply assemble a false ceiling secondary framework on a primary framework, without requiring additional parts other than the furs themselves and without weakening the sections. Thus the range between two supports for the same length of profile can be increased compared to the prior art, and up to four meters. In addition, a single primary framing profile as described above can accommodate several secondary framing profiles. In addition to the profiles F530 mentioned, one can consider using profiles or furs of greater inertia for which the spacings of the primary frames can be widened, thus further limiting the total weight of the frame.

The use of the fixing hanger as described above finally eliminates some screwing operations, thus reducing the cost of installation time. The present invention is not limited to the preferred embodiment described above by way of non-limiting examples. It also relates to all embodiments within the scope of the skilled person, within the scope of the claims below. For example, it would not be outside the scope of the invention using fastening heads having a shape different from that described above. All the elements described may also have a shape different from that shown in the drawings. It would not go beyond the scope of the invention if the attachment heads were for example added an I-shaped profile or C and did not form a single piece with said profile.

Claims (9)

REVENDICATIONS1. Section for a false ceiling primary structure comprising a core (2) and at its base a flat part, called a bottom flange (4), forming a support, characterized in that the bottom flange (4) comprises at least one fixing head (6) projecting from said bottom flange (4) on the side opposite the web of the profile and intended to snap into place with a C-shaped piece (9). 2. Profile according to claim 1, characterized in that each fixing head (6) projecting is in one piece with the profile (1). 3. Profile according to one of claims 1 or 2, characterized in that it has a profile I. 4. Profile according to one of claims 1 to 3, characterized in that its lower flat portion (4) has two thicknesses, one on the so-called inner core side, and the other said outer, and in that each projecting mounting head (6) is produced by cutting the outer thickness of the lower flat part (4). 5. Profile according to one of claims 1 to 4, characterized in that it comprises a plurality of fixing heads (6) regularly distributed over its entire length. 6. Profile according to one of claims 1 to 5, characterized in that the fixing heads (6) are composed of pairs of ends of fixing heads (6). False ceiling suspension comprising a grid network of support profiles formed, on the one hand, of a primary framework of support profiles (1) which are intended to be suspended from suspension lines (16, 32) and, on the other hand, a secondary framework of support profiles (9), which are fixed at regular intervals to the primary framework profiles, perpendicular to them, characterized in that it comprises at least one profile (1) according to one of claims 1 to 6. Ceiling suspension according to claim 7, characterized in that the profiles (1) of the primary framework have an I-shaped profile, in that said false ceiling suspension further comprises suspensions (16, 32) carrying the primary framework, in that each line comprises, firstly, a threaded rod (32) and secondly a hanger foot (16), in that each hanger foot (16) comprises a support wall (20) adapted to be secured to the threaded shank (32), in that the support wall (20) is extended along two parallelogram-shaped wings (18) extending from the support wall (20) in a divergent manner and each provided with a return (24) directed inwardly of a volume embraced by the support wall (20) and the planes of the wings (18). Ceiling suspension according to claim 8, characterized in that the profiles (1) of the primary framework have an upper sole (8) with a wing return (10) at each free edge of said sole, and in that the returns (24) of the hanger feet each have a housing for receiving the free end of a wing return (10).