FR2599769A1 - LIGHTWEIGHT CONSTRUCTION INCLUDING A SHAPED OVERALL ENVELOPE OR COVER - Google Patents

Abstract

THE INVENTION RELATES TO A LIGHTWEIGHT CONSTRUCTION INCLUDING AN ENCLOSURE OR COVER OF GENERAL ROUNDED SHAPE, CARRIED BY A FRAME. THE ENCLOSURE OR COVER INCLUDES A PLURALITY OF COVER PROFILES 4, EACH INCLUDING TWO BLADES 7, 8 HOSES IN SIDE, AND A SPACER BAR 9 UNIT THESE BLADES. EACH COVER PROFILE 4 INCLUDES LATERALLY, OVER A LENGTH L, TWO MALES BLADE TRUNKS SPACED AT A DISTANCE D. THE COMPLEMENTARY FEMALE BLADE TRUNKS ARE SPACED A DISTANCE GREATER THAN D. THE ASSEMBLY OF TWO 4 NEIGHBORING PROFILES IS ACHIEVED BY INSERTING 11 PICKUP RETURNS OF ONE OF THE PROFILES BETWEEN THE FEMALE BLADE SECTIONS OF THE SECOND PROFILE. THE PENETRATION OF THESE PICKUP RETURNS 11 MAY VARY BETWEEN A MAXIMUM DISTANCE SENSITIVELY EQUAL TO L AND A MINIMUM DISTANCE IN WHICH THEY ARE COOPERATED WITH THE PICKUP RETURNS 11 OPPOSITE.

Description

LIGHTWEIGHT CONSTRUCTION INCLUDING A SHELL OR SHAPE COVER

GENERAL ROUNDED

  The invention relates to a lightweight construction comprising an envelope having a generally rounded shape. At present, there are few examples of construction embodiments whose envelope has 10 curved line portions or, more generally, a rounded shape, despite the originality and the aesthetic interest of such constructions particularly suitable for

  creation of leisure homes.

  The main reason for this lack of enthusiasm comes from the fact that there is no construction system that reconciles the two qualities, simplicity of the construction system and ease of installation, essential for the realization of constructions at low cost.

returns reduced.

  A first system consists in making self-supporting shells by molding a material such as -polyester. Despite the ease of fitting these shells, this system leads to a very high cost price mainly due to the high price of the mold and the cost of transport. In addition, the method of manufacturing the hulls leads to a large rate of rejects, and the production of structures of large dimensions requires the production of hulls of a

  significant thickness which burdens the cost.

  In the same vein, * constructions of rounded shapes made up of prefabricated elements, made of reinforced concrete, have been made. In addition to the cost price of

  curved formwork, this construction system fishes mainly because of the difficulties of transport, handling and installation of such prefabricated elements which lead to the production of very heavy structures.

  A third construction system consists in making a cover made of flexible sheets, of relatively small dimensions allowing them to match the shape of the envelope, and in securing these sheets on 40 frame elements bent longitudinally. It is understood that the establishment of such a cover constitutes a long and delicate operation. In addition, such a construction system gives rise to numerous sealing suggestions, in particular with regard to water.

  The present invention proposes to remedy the shortcomings of known systems, by providing a new construction, satisfactorily reconciling the qualities of tightness, simplicity of structure and ease of assembly.

  An essential objective of the invention is in particular to provide a very light construction provided with a cover which does not require, during its installation, any drilling or bolting operation of the various frame and cover elements, and which more generally

requires no tools.

  Another objective is to suppress any suggestion of tightness when installing the cover. Another objective is to provide a construction in which the various constituent elements, framework or cover elements, occupy in the disassembled state, a very small volume and are therefore very easily transportable. Another objective is to allow very rapid repair of the cover, in the event of deterioration

accidental of it.

  To this end, the light construction targeted by the invention is of the type comprising a framework and anchoring means 30 adapted to ensure the seat thereof, and an envelope or cover, having a shaped section.

  generally rounded, carried by said framework.

  According to the present invention, said construction is characterized in that the envelope or cover comprises: - a plurality of sections, called cover, each comprising two flexible blades facing each other, preserving an empty volume between them, and at least one bar spacer bringing together said blades, said 40 cover profiles being provided, laterally, with means of cooperation adapted to allow the assembly of two neighboring profiles,

  - means for hooking the cover profiles adapted to fix said profiles on the frame.

  Preferably, this construction comprises an envelope or cover of generally rounded shape. It is then characterized in that: each cover profile comprises, on one side and over a width L, two sections of facing blade, called male sections, spaced apart by a distance d, and on the opposite side, blade sections, called female sections, spaced apart by a distance D greater than d, - the cooperation means are adapted to allow the insertion of the male sections of a cover section between the female sections of a cover section neighbor, between two extreme positions: a maximum insertion position where the male sections penetrate by a distance at most equal to L 20 between the female sections, a minimum insertion position where the male sections penetrate from a given distance, lower

  at the maximum insertion distance.

  It should be noted that by generally rounded shape is intended to define a structure having a cross section and / or a longitudinal section of generally rounded shapes. The term rounded is used, meanwhile, to define a general form of circular envelope,

  ovoid or more generally curved.

  The constructions carried out therefore mainly comprise a cover made up of profiles of small width which conform to the curved shape of the frame, during their installation, only under the effect of their own weight, thanks to their flexibility. These constructions are therefore very light and very easy to transport, each profile being able to be stored flat and all of the profiles

  stacked without any loss of volume.

  According to a preferred embodiment, the cooperation means comprise picking returns at the right 40 of each lateral end of each blade: picking returns, said to be male, oriented towards the outside of the cover profile and positioned at the right of the lateral end of the male sections, so-called female return hooks, oriented towards the inside of the cover profile and positioned in line with the lateral ends of the female sections, The maximum insertion position then corresponds to penetration of the hooks male of a cover profile between the female sections of a neighboring profile, a distance substantially equivalent to L. The minimum insertion position corresponds, in turn, to a state of cooperation of the male and female hooks respectively of

  two neighboring cover profiles.

  The different cover profiles therefore fit together very easily. The transverse play is authorized by the possibility for the 20 male hooks to move transversely between the female sections of the neighboring profile. Thus, at the longitudinal ends of the construction, which correspond to the zones where the length of the contour of the envelope is the smallest, the male picking returns 25 of each blade will penetrate of length L between the female sections of the neighboring profile. . Conversely, in line with the median plane of the dwelling, the various returns from

  hooking will be in a cooperative position.

  In order to ensure rapid and easy fixing of the various cover profiles to the framework, the means for hooking these profiles comprise, according to another characteristic of the invention, hooks provided with an end adapted for snap inside a groove opening at the outer face of the blade opposite the frame, said inner blade. Fixing means allow them to secure the hooks to the frame. For purposes of lightness and speed of installation, this framework generally consists of framework elements curved longitudinally and arranged in parallel, at a determined distance from each other.

to others.

  The fixing means can then consist of a groove formed on these framework elements and adapted to accommodate the hooks, while allowing them to slide. They can also consist of a rod extending along the framework elements, at a given distance above them. The hooks are then threaded onto this rod, on which they can slide.

  The installation of the cover therefore requires no tools and is done only by a simple pressure applied to the cover profiles, once they are positioned correctly opposite the hooks. We can imagine the extreme simplicity of such a construction system. In fact, once the seat of the construction has been completed, its assembly consists in putting in place the framework elements, preferably by using casing members capable of accommodating the base of these framework elements and carried by 20 stringers. The next step is to arrange the cover profiles as shown above. The implementation of the cover does not therefore require any operation

  adjustment or setting or any suggestion of tightness.

  Finally, the insulation of such a construction can consist in projecting an appropriate insulator

  on the inside of the envelope. The hooks of the cover profiles are then embedded in the layer of insulation which they help to reinforce. To this end, it can be envisaged to adapt the length of these hooks to the thickness of the desired layer of insulation.

  The invention extends as essential means constituting the construction, to a cover profile, for construction of generally rounded shape, and to the hooks allowing the attachment of such profiles on curved framework elements. The cover profiles are preferably obtained by folding a sheet in one piece. They can also be obtained by spinning or

light alloy extrusion.

  The invention set out above in its general form will be better understood on reading the description.

  which follows and on examining the appended drawings which show, by way of nonlimiting examples, two preferred embodiments; on these drawings which are an integral part of

this description:

  - Figure 1 is a perspective view of a construction produced in accordance with the invention, - Figure 2 shows in cross section the section of a cover profile of said construction, - Figures 3 and 4 are views in perspective of two alternative hooks allowing the fixing of the cover profiles, - Figure 5 shows in cross section the section of an auxiliary cover profile used for the lining of the cover - Figure 6 shows in cross section the section of two assembled cover sections, FIG. 7 is a cross-section, through a vertical plane, of a first embodiment of construction, - FIG. 8 is a longitudinal section, through a CC plane, of this construction, - FIG. 9 is a cross-section, through a vertical plane, of a second embodiment of construction, FIG. 10a is a detailed view in section of a first system for hooking the cover profiles, - Figure lob is a section on a plane 30 A.A of Figure 10a, - Figure 11a is a detail view in section showing a second attachment system of the cover profiles,

  - Figure llb is a section on a plane 35 B.B of Figure 11a.

  The light construction shown by way of example in FIG. 1 has an ovoid general shape truncated longitudinally by a vertical front face 1, which can be made of any type of material known per se. 40 Symmetrically, this structure also has a facade

rear 2 vertical.

  This structure comprises a base carrying frame elements 3 bent longitudinally. 5 In order to give its ovoid shape to the structure, each frame element 3 has a length and delimits a different vault height relative to the neighboring frame elements.

  These framework elements 3 can be made of any known, bendable material. Mention may, for example, be made of iron, aluminum or else the use

of glulam elements.

  The cover of the structure is made up of cover profiles 4 fixed on the framework, so as to

  extend orthogonally to the frame elements 3.

  To allow a better understanding of the structure of the cover and its mounting, the cover profile 4 and two alternative hooks (5, 6) adapted to fix these cover profiles 4 on the frame elements 3, are described in detail below. -after respectively 20 with reference to Figures 2, 3, 4. These profiles are preferably made of steel or aluminum alloy, generally lacquered. It should be noted that the use of such materials makes it possible to produce a united envelope or a

  envelope with color gradients.

  The cover profile 4, generally obtained by folding, has, in its finished form, two flexible blades 7, 8, facing each other, preserving an empty volume between them, and a spacer bar 9 obtained during folding. Each of the blades 7, 8 has a longitudinal fold 10 delimiting two parallel blade sections. There is thus obtained, over a given width of the profile, a reduction in the distance separating the

two blades 7, 8.

  It should be noted that the constricted part of the profile 4 is positioned opposite, transversely, 35 of the spacer bar 9, so as to guarantee good flexibility of this lateral end of the profile. In return, after folding and by the presence of the spacer bar 9, the opposite lateral end has a good rigidity which tends to oppose a differential deformation 40 of the two blades 7, 8, when the square

of the cover profile.

  At each of its lateral ends, each blade 7, 8 is, moreover, provided with picking returns 11, 12.

  Latching returns 11, said to be male, oriented towards the outside of the profile 4, extend the constricted part of this profile. In contrast, hook returns 12, said to be female, oriented towards the inside of the profile, 10 extend the other lateral end.

  The assembly of two profiles 4 is therefore obtained by the penetration of the male blade sections of a profile inside the groove 13 delimited by the female blade sections of the two blades 7, 8 and the spacer bar 15 9, from a neighboring profile 4. It should be noted that the two blades 7, 8 are not parallel, with a view to causing the male hooks 11 to pressurize against the internal face of the corresponding blades, during the assembly of two sections. Once the assembly has been carried out, there is between the two profiles a transverse clearance L corresponding to the width of the groove 14 delimited by the longitudinal fold 10 and the hook mixes ll of the corresponding blade. This transverse play makes it possible to produce structures of generally rounded shape, that is to say structures whose

  cover has a developed transverse length, variable depending on the longitudinal position considered.

  The cover profile 4 is further folded so that the two blades 7, 8 are offset transversely. This offset is made so that

  the picking return mix ll formed on the blade 7 intended to be positioned opposite the frame elements 3, said inner blade, projects laterally with respect to the picking return 11 formed on the facing blade 8, said outer blade 35.

  This overhanging surface 15 makes it possible to channel any rainwater seeping between the two external blades 8 of two assembled profiles 4, ie towards the groove 16 delimited by the sections of male blade and 40 the spacer bar 9, profile 4 with this overhang 15, ie towards the groove 13 delimited by the blade sections

  females and the spacer bar 9 of the neighboring profile.

  It is therefore noted that the rainwater is 5 either discharged through the groove 14 formed on the outer blade 8 of the profile 4, or, in the event of infiltration, by one or

  the other groove 13, 16 towards which they are channeled by the overhang 15. The watertightness of this profile 4 is therefore perfect, and no suggestion of sealing is to be expected 10 during the positioning of the cover.

  In addition, the assembly clearance between two neighboring profiles 4 allows air to circulate inside the internal volume of these profiles, thereby avoiding excessively high air temperatures between the two blades 7, 8, 15 in particular by summer season.

  Finally, each cover profile 4 has an inverted V-shaped groove opening at the outer face of the inner blade 7. In addition, this inner blade 7 extends at the groove 17 20 so as to constitute two returns 18 inside this.

  The attachment of these cover sections 4 to the framework is carried out by means of hooks 5, 6 provided with two flexible branches 19, facing each other, comprising a free end provided with a suitable picking return 20 to snap inside the aforementioned groove 17. There are two different types of hooks, each suitable for a

  variant of hanging mode, as will be seen below.

  The first type of hook 5, represented in FIG. 3, has the general shape of a V whose

  free ends have hook returns 20.

  The two branches 19 of this hook 5 are also pierced, in the vicinity of their base with an orifice 21 of generally circular shape. The second type of hook 6, shown in

  FIG. 4 shows the general shape of a U whose free ends of the arms 19 are provided with picking returns 20. The opposite ends of the arms 19, as well as the base 22 of the hook 6, have a wider heel 23 40 than the current part of the branches 19.

  FIG. 6 represents an auxiliary cover profile 24 used for the lining of the cover profile 4 in the event of accidental deterioration of the latter or following its deterioration over time. This auxiliary profile 24 consists of a flexible blade of conjugate shape of the outer blade 8 of a current cover profile 4. This shape allows it to snap onto a cover profile 4 and this, in particular thanks to the flexibility of

  the lateral end mixes of the latter.

  The existence of this auxiliary profile 24 therefore makes it possible to guarantee a very long service life of the constructions produced. It can also, incidentally, allow the dubbing of an existing cover in order to modify its color.

  These different profiles allow the realization of light constructions as shown in Figures 1, 7, 8, 9. In order to achieve these constructions, the cover profiles 4 rest on elements 20 of framework 3 bent longitudinally, which can be made of '' in one piece or by end-to-end assembly of two or more sections of elements. These framework elements are themselves supported by bearing elements capable of

  ensuring the distribution of loads on the ground.

  The constructions produced can mainly have two forms, depending on whether each of the frame elements 3 defines a closed curve (FIG. 9) or whether each of these framework elements 3 defines a voOte (FIG. 7). In the latter case, the foot of each frame element 3 is housed in a casing element 25 carried by a beam 26 disposed substantially orthogonally to the

framework elements 3.

  These beams 26 can be adapted to directly distribute the weight of the structure on the ground or 35 themselves be carried by a sill 27. In addition, between these two beams 26 are arranged cross members 28 capable of carrying the construction floor . Each of these crosspieces 28 extends between the two longitudinal members 26 so that their ends are integral, each of one of the

stringers 26.

  l1 The stringers 27 can, for their part, be either placed directly under the beams 26, or, as shown in FIG. 7, be arranged recessed with respect to them, the end of the crosspieces 28 being in door false over these sills 27. The cover sections 4 are, in turn, arranged around the entire periphery

framework elements 3.

  For the other embodiment, the carrier elements 3 are adapted to position the crosspieces 28 at a determined height above the ground. In the example (Figure 9), these load-bearing elements consist of a central foundation block 29 of each side from which extend two beams 30 arranged in a console. As before, the framework elements 3 are carried by

  casing elements 31 carried by side members 32 integral with the end of the crosspieces 28. The foundation block 29 may also consist of a hollow barrel accessible from inside the dwelling, in order to constitute a space of 20 additional storage (cellar ...).

  In order to obtain the ovoid shape of the construction, the frame elements 3 are extended by complementary frame elements 33 extending under the floor of the house. The ends of these complementary framework elements 33 are also housed in the casing elements 31, end to end with the ends of the

3 main frame elements.

  The cover sections 4 are, for their part, disposed over the entire contour of the envelope formed by the end-to-end placement of the main framework elements 3 and

complementary 33.

  The way in which these cover sections 4 are assembled on the framework elements 3 (or 33) is shown in FIGS. 10 and 11. The hooks 5, 6, 35 allowing this assembly, are provided with two branches 19 each having one end free with a hooking return 20 adapted to snap inside the groove 17 provided for this purpose on the underside of the profile

cover 4.

  Depending on the type of hook used, the end opposite to the picking returns is either housed in a groove 34 made on the framework elements (Figures iOa, lob), or slidably mounted on a rod 35 5 fixed on these same elements framework (lia, llb). In addition, in order to allow the hook 6 to be maintained, the groove 34 is provided, at its open face, with two returns 36

  oriented towards the inside of this groove.

  In either case, these hooks 5, 6 10 can slide along the frame elements 3 so as to

  allow them to be positioned vertically above a groove 17 of a cover profile 4. Once the correct positioning has been obtained, it suffices to press it on the cover profile 4 to secure it 15 on a frame element 3.

  It should be noted that the framework element 3 shown in Figures liOa, lOb consists of a profile with a peripheral wall comprising a groove 34 formed so as to open at a generator of this 20 streamlined. Such a frame element, made in one piece, requires only a bending operation and eliminates the assembly operations, necessary when using a rod 35 (hook 5) or a profile U-shaped

  attached to the frame element 3 (hook 6).

  Once the habitable construction is completed,

  the envelope is insulated internally by means of a projected insulating material 37. The thickness of the insulating layer preferably makes it possible to cover the hooks 5 or 6 and the framework elements 3, so as to obtain a surface 30 smooth interior.

  In addition, the good mechanical strength of the layer of insulating material is ensured by the presence of hooks 5 or 6, which are of a length suitable for reinforcing

this insulator.

Claims (20)

  1 / - Light construction of the type comprising a framework and anchoring means adapted to ensure the seat thereof, and an envelope or cover, having a generally rounded section, carried by said framework, said construction being characterized in that said envelope or cover comprises: - a plurality of profiles (4), called cover, each comprising two flexible blades (7, 8) facing each other, preserving an empty volume between them, and at least one bar spacer (9) joining said blades, said cover profiles (4) being provided, laterally, with cooperation means (11, 12) adapted to allow the assembly of two neighboring profiles, - hooking means ( 5, 17, 19, 20, 23, 34, 36; 6, 17, 19, 20, 21, 35) of the cover sections (4)   adapted to fix said sections on the frame.   2 / - Light construction according to claim 27, comprising an envelope or cover of generally rounded shape, characterized in that: - each cover profile (4) comprises, on one side and over a width L, two sections of blade opposite, said male sections, spaced apart by a distance d, and on the opposite side, blade sections, said female sections, spaced apart by a distance D greater than d, - the cooperation means (11, 12) are adapted to allow the insertion of the male sections of a cover section (4) between the female sections of a neighboring cover section (4), between two extreme positions: a maximum insertion position where the male sections penetrate of a. distance at most equal to L between the female sections, 35. a minimum insertion position where the male sections penetrate by a given distance, less   at the maximum insertion distance.   3 / - Light construction according to claim 2, characterized in that: - the cooperation means (11, 12) comprise picking returns to the right of each lateral end of each blade: picking returns (11), called 5 male, oriented towards the outside of the cover profile (4) and positioned in line with the lateral end of the male sections, hooking returns (12), said to be female, oriented towards the inside of the cover profile (4 ) and positioned in line with the lateral ends of the female sections, - the maximum insertion position corresponds to penetration of the male hooks of a cover section (4) between the female blade sections of a neighboring section (4) , from a distance substantially equivalent to L, - the minimum insertion position corresponds to a state of cooperation of the male hooks (11) and   respectively females (12) of said neighboring cover profiles 20 (4).   4 / - Construction according to claim 3, characterized in that the two blades (7, 8) of each cover profile (4) are arranged so as to have a transverse offset (15), the return of male picking (11) 25 formed on the blade (7) facing the frame, said inner blade, projecting laterally with respect to the picking return (11) formed on the blade (8) facing, said outer blade. / Construction according to one of   previous claims, characterized in that the means   hooking (5, 17, 19, 20, 23, 34, 36; 6, 17, 19, 20, 21, 35) of the cover profiles (4) on the frame include hooks (5; 6) provided an end adapted to snap inside a groove (17) opening at the level of the external face of the internal blade (7), and fixing means (19, 20, 23, 34, 36; 19, 20, 21, 35)   said hooks on the frame (3).   6 / - Construction according to claim 5, characterized in that the inner blade (7) extends at the level of the groove (17) so as to constitute two returns (18) inside said groove, the hooks ( 5; 6) comprising two flexible arms (19) facing each other, having a free end provided with a picking return 5 (20) adapted to snap inside the groove (17). 7 / - Construction according to one of   previous claims, in which the framework comprises longitudinally bent framework elements (3) arranged in parallel, at a distance determined by each compared to others.   8 / - Construction according to claims 6 and 7 taken together, characterized in that the means for fixing the hooks (5; 6) on the frame elements (3) 15 comprise a groove (34) formed on said elements   of frame and endowed with open face, two   returns (36) oriented towards the inside of said groove, the hooks having a wider heel (23), opposite the picking returns (20), so that they can slide inside the groove ( 34).   9 / - Construction according to claim 8, characterized in that each framework element (3) consists of a profile comprising a peripheral wall provided   a groove (34) formed in said peripheral wall, so as to open at a generator of said profile. / - Construction according to one of   Claims 5 or 6, characterized in that the means for fixing the hooks (5; 6) to the framework elements (3) comprise a rod (35) extending along said elements (3), at a distance determined of these, the   hooks (5) having an orifice (21), of diameter combined with the diameter of the rod (35), so as to allow their   sliding along said rod. 11 / - Construction according to one of   claims 5 to 10, characterized in that the surface   inside of the envelope is insulated by means of a projected insulating material (37), the hooks (5; 6) being of a   length adapted to arm said insulator. 12 / - Construction according to one of   previous claims, characterized in that it comprises   an auxiliary cover profile (24) consisting of a blade   flexible of conjugate shape of the outer blade (8) of a cover profile (4) so that it can snap onto said cover profile in order to serve as an external lining of the cover.   13 / - Construction where one of the   claims 7 to 12, characterized in that the anchoring means comprise two longitudinal members (26; 32) arranged 10 substantially orthogonally to the framework elements (3) and   provided with casing elements (25; 31) capable of accommodating the base of said framework elements (3), and bearing elements (27; 29, 30) capable of ensuring the distribution of the loads on floor.   14 / - Construction according to claim 13, characterized in that it comprises crosspieces (28), adapted to carry a floor, arranged substantially parallel to the frame elements (3) and integral, at   each of their ends, of a beam (25; 32).   15 / - Construction according to claim 14, characterized in that the carrier elements (29, 30) are adapted to position the crosspieces (28) at a determined height above the ground and in that the casing elements (31 ) are adapted to accommodate a second frame member (33) curved longitudinally, so that said second frame member (33) forms with the first frame member (3) a closed curve, the cover profiles ( 4) being arranged over the entire contour formed by these two framework elements (3, 33). 16 / - Construction according to one of   Claims 14 or 15, characterized in that the load-bearing elements (29, 30) consist of a central foundation block (29) carrying on both sides, two beams (30)   arranged in brackets supporting the crosspieces (28).   17 / - Construction according to claim 16, characterized in that the foundation block (29) consists of a hollow barrel accessible from inside the habitable structure. 18 / - Construction according to one of   previous claims, consisting of an envelope or   cover of generally rounded shape characterized in that said envelope or cover is truncated by at least one vertical plane (1, 2) defining a facade of said construction.   19 / - Cover profile (4) capable of being used for the production of a light construction according to one of the preceding claims, characterized   in that it comprises: - two flexible blades (7, 8), facing each other, preserving an empty volume between them and joined by at least one spacer bar (9), said blades being spaced apart, on one side and over a width L, from a distance d, and from the opposite side, from a distance D greater than d, - cooperation means (11, 12) allowing two adjacent profiles (4) to be assembled and comprising returns hooking to the right of each of the lateral ends of each blade: hooking returns (11), called 20 males, oriented towards the outside of the cover profile and positioned to the right of the lateral end of each blade, delimiting the zone of said profile where the blades are spaced from d, picking returns (12), called 25 females, oriented towards the inside of the cover profile   and positioned to the right of the opposite lateral ends.   - a groove (17) opening at the external face of one of the blades (7), said blade extending inside said groove, so as to constitute two returns (18) on either side other, inside it.   / - Cover profile according to claim 19, characterized in that the two blades (7, 8) are offset transversely with respect to each other, the male picking return (11) of the blade (7) provided of the groove (17) projecting laterally with respect to the return of   male hooking (11) opposite.   21 / - Cover profile according to one of claims 18, 19 or 20, obtained by folding a sheet of a in one piece.   22 / - Hooks (5; 6) likely to be   used for the production of a light construction according to one of claims i to 18, characterized in that they comprise two flexible arms (19), facing each other, 5 having a free end provided with a picking return   (20) oriented towards the outside of said branches (19).   23 / - Hook according to claim 22, characterized in that it comprises two branches (19) having a wider heel (23) opposite the picking returns 10 (20).   24 / - Hook according to claim 22, characterized in that the two branches (19) are pierced with an orifice (21) of determined diameter, opposite the returns of hooking (20).