FR3007590A1 - CABLE PATH TERMINALS COMPRISING JUNCTION ELEMENTS AND CABLES COMPRISING SUCH TRUNCONS - Google Patents

Abstract

A section of U-shaped cross-section wire mesh cable duct, said section comprising a wire mesh formed by assembling warp and weft wires defining a bottom and two flanges; hooks protruding from one end of the section on the bottom and the wings thereof for attachment to an adjacent section, each hook forming a hollow reserve, concavity facing outwardly of the section, located at the height of weft threads; wherein each hook belongs to a patch on the wire mesh.

Description

The invention relates to the field of cable trays, and more particularly to the assembly of sections of cable trays. BACKGROUND OF THE INVENTION The cable trays allow the support of cables at high heights (in vertical configuration) or long lengths (in horizontal configuration), including electrical cables, telephone cables, fiber optic cables, or computer network cables. The cable trays are formed of sections generally made of metal, in particular steel, stainless steel, or optionally plastic or composite material. For many years, and without there being any international or European rules in this area, the longitudinal dimension of the cable tray sections is three meters, in general, as recalled on page 2 lines 12 and 13 of the document FR2737355. From these sections, we build the cable tray networks that we want. To do this, the sections of cable trays are positioned end to end and these sections are conventionally immobilized by means of connecting pieces, typically splints, flat plates, possibly hinged, or else using angle irons. . The sections are also fixed, from place to place, on consoles or hangers, or even suspended, the distance between the supports being typically of the order of one meter fifty.

There are two types of cable tray sections, namely the sheet metal sections (perforated or not) and the wire mesh sections. C008 B060 EN - TQD The invention relates more particularly to cable trays comprising wire mesh sections or end portions of wire mesh.

The wire mesh sections comprise longitudinal wires, called warp yarns, and transverse weft yarns, crossed and welded with the warp yarns, conventionally giving the mesh a U-shaped section.

The sections may undergo further processing, depending on the environment in which they are intended to be placed. Thus the metal sections can undergo galvanization, be plasticized or coated with a layer of epoxy resin.

Manufacturers of cable trays have, for many years, developed a great many technical solutions to facilitate the connection by splicing the cable tray sections, both in terms of the number of tools and parts as well as the time required for assembly of the splints on the sections.

The diversity of technical solutions illustrates the importance given by manufacturers to these splints. There are four main types of placement of the fishplates for wire mesh cable trays: - mounting of the splice or the connecting piece by bolting, as presented in the documents EP0298825, EP0399790, EP0617493; - Assembly of the splice by welding, as presented in the documents EP0571307, WO2013007855; - mounting of the splice force or snap, as presented in the documents FR2208219, US5384937, US6193434, FR2879036; - Installation of sliding splints, as presented in EP822364, EP1193821. C008 B060 EN - TQD The manufacture and assembly of the splice plates or connecting pieces on the wire mesh generate significant costs. The assembly of the splices on each section of cable trays, on site, requires tools and takes time.

In addition, on the site, the fitter may not have easy access to the two wings of each section of cable trays on which must be mounted ribs. In an attempt to overcome these drawbacks, it has been proposed to modify the configuration of the end portions of cable truss sections of wire mesh so as to allow their joining without using an insert, as shown in the documents FR2966987, DE19946388, EP973238. , EP1511142, FR2971110. The sections of cable trays described in these prior documents prove to be complex and expensive to manufacture.

It is known from document ES 2316256 (INTERFLEX) - and its European equivalent EP 2276129 - a section of wire mesh cable tray, one end of which comprises a plurality of hooks engaging a transverse wire of an adjacent section. The hooks are formed at the ends of the warp threads, which are folded to have a deflection close to the hook so that, when two sections are butted, the hooks are not aligned with the warp threads of the adjacent section.

The cable tray described in ES 2316256 has several disadvantages. The manufacturing cost of such a section is high. Indeed, the folded shape of the warp son at one of the ends of the section assumes a recovery operation during manufacture, which affects the rate of production. In case of breakage of a hook, no repair is possible, the only solution being to replace the entire section. C008 B060 EN - TQD The solution proposed below is intended to overcome the disadvantages of the prior art. One objective is to propose a section of cable tray whose manufacture is simple, inexpensive, and fast. Another objective is to propose a section of cable tray having good mechanical strength.

Another objective is to propose a section of cable tray whose installation is simple, fast and ergonomic. For this purpose, it is proposed in the first place a section of cable tray comprising: - a wire mesh formed by assembling warp son and weft son defining a bottom and two wings; - Hooks protruding from one end of the section on the bottom and the wings thereof for attachment to an adjacent section, each hook forming a recessed reserve, concavity facing outwardly of the section, located at height weft threads; wherein each hook belongs to an assembly part attached to the wire mesh. Various additional features may be provided, alone or in combination: - the attached connecting piece is formed by folding a wire; - The reported assembly part comprises a fixing portion, formed of a wire for securing the part on the section; - The reported connection piece is welded to two weft son of the section by its fixing portion; - The or each assembly part attached to the bottom comprises two longitudinal son connected at a free end by a transverse connection; the connection between is in the form of a folded C-wire inclined relative to the bottom of the section; the hook of the attached connecting piece is tangential to the end weft thread of the section. C008 B060 EN - TQD Secondly, a cable duct made by assembling at least two sections as presented above.

Thirdly, there is proposed a wire mesh ply formed by assembling longitudinal warp threads and transverse weft threads, the ply comprising yarns distinct from the yarns forming the wire mesh, these distinct yarns being welded onto two son of frame and between two warp threads.

Fourthly, there is provided a wire mesh ply formed by assembling longitudinal warp threads and transverse weft threads, the ply comprising insert parts welded onto two weft threads and between two warp threads. the insert parts including a hook forming a hollow reserve, the hook protruding from the web and being perpendicular to the web. Other characteristics and advantages of the invention will appear more clearly and concretely on reading the following description of embodiments, which is made with reference to the accompanying drawings in which: FIG. top perspective of the assembly of two sections of abutment cable tray, by means of fastening elements integral with one of the sections; - Figure 2 is a detailed sectional view of the assembly of Figure 1; - Figure 3 is a perspective view from above of a cable tray section comprising, at one of its ends, fastening elements; - Figure 4 is a perspective view from above showing in detail one end of a cable raceway section comprising fastening elements according to two embodiments; - Figures 5 and 6 illustrate two steps of manufacturing a cable tray section. C008 B060 EN - TQD In Figure 1 is shown, in perspective from above, an assembly of two sections la, lb of cable tray 1 wire mesh U cross section.

Each section 1a, 1b is composed of a lattice formed by assembling warp yarns 2 defining a longitudinal direction and U-shaped weft yarns 3, defining a transverse plane and thus forming, with the warp yarns 2, a bottom 4 and two wings 5. The weft son 3 are fixed on the inside of the warp son 2, in the embodiments shown. In the embodiments shown, the warp threads and the weft threads are of identical section. In a variant, the warp threads and / or the weft threads are of section adapted to the loads provided for each part of the section. The wings 5 extend on either side of the bottom 4 substantially perpendicular to it.

As an alternative embodiment, not shown, the flanges of the cable tray are not perpendicular to the bottom, the section having a flared section so as to allow the stacking of the sections in each other. The section may have a flat-bottom V-shaped section, as known per se and described for example in the documents WO2013041741, EP818862, WO2006076746, U52002030143. Each section also comprises hooks 6 protruding from the section 1 at one end thereof, on its wings 5 and its bottom 4.

The hooks 6 allow, as will be described below, to assemble two sections la, lb to form a cable tray 1. The hooks 6 form a hollow reserve 8, concavity facing outward of the section la, 1 b.

As can be seen in FIG. 2, the recessed reserve 8 is situated at the height of a weft thread 3, so that when two sections 1a, 1b are assembled, the reserve 8 of the hooks 6 of a first section the C008 B060 FR - TQD accommodates an end weft thread 3 of a second section 1b, the sections 1a, 1b being then aligned longitudinally with respect to each other.

The hollow recess 8 of the hook 6 has an arcuate profile whose inner diameter is substantially equal to the diameter of the weft thread 3 of the second section 1b. Thus, when assembling two sections la, lb, only a functional game persists, this game ensuring the hooks 6 of a first section la to engage a weft thread 3 of a second section lb. Advantageously, the end portion 6a of the hooks does not project below a plane P tangent to the warp threads 2, on the outer face of the sections 1a, 1b. The end portion 6a of the hooks 6 is advantageously blunt or smooth so as to avoid any risk of injury. Each hook 6 belongs to an assembly part 11 attached to the wire mesh and distinct from the warp threads 2.

This insert 11 reported includes, in the extension of the hook 6, a longitudinal fastening portion. Advantageously, the longitudinal fastening portion is formed by a wire whose diameter is identical to that of the warp threads 2. The hook 6 can thus be formed by folding a wire identical to that forming the warp threads 2. The portion fastening is substantially rectilinear and extends parallel to the warp son 2 and substantially perpendicular to the direction of the concavity of the hook 6.

In an alternative embodiment, the fastening portion is a flat welded to the weft threads 3. The fastening portion allows the joining piece 11 to be secured to the wire mesh, preferably straddling at least two threads. weft 3 of the same section. C008 B060 EN - TQD Each insert 11 attached is fixed, for example by means of welds, on the two weft son 3 of one end of the section.

Advantageously, only the hooks 6 protrude in the male end portion of a section la, the hooks 6 being tangent to the end weft thread 9 of the section la. In other words, the attachment portion of the insert part 11 reported is fully included in the bottom 4 of the section la without exceeding it.

In a second particular embodiment shown in particular in Figure 4, the fasteners attached to the bottom 4 (or wings 5) are U-shaped when viewed from above and are in the form of a folded wire 12 .

In the embodiments shown in the drawings, the section comprises four assembly parts 11 reported, namely two parts in the bottom 4 of the section and a part on each wing 5. The number of fasteners is adapted to the width sections 1a, 1b, and at the height of the wings 5. On each wing 5, an assembly piece 10a is placed in the vicinity and preferably in contact with the edge warp wire 2a at the male end portion of a first stretch the. The hook 6 of this assembly piece 10a thus comes close to and preferably in contact with the edge warp thread 2b at the female end portion of the second section 1b, at the junction of the sections 1a, 1b. Advantageously, the hook 6 does not extend beyond the plane tangent to the wing 5, on the outer face of the wing 5 and the end portion 6a of the hook 6 is blunt or smooth so as to avoid the risk of injury. . The presence of the hooks 6 at the end of the male sections does not change the outer jig sections.

In the embodiments of FIGS. 1 to 3, all the insert parts 11 that are fitted include hooks 6. In the embodiment C008 B060 FR-TQD of FIG. 4, the assembly parts comprise both hooks. 6 and folded son 12. Alternatively, the folded son 12 are arranged on the wings 5 and the hooks 6 in the bottom 4 of the section. Figure 3 illustrates a method of assembling two sections la, lb by an operator to form a cable tray.

To assemble two sections 1a, 1b, the operator, in a first step, engages the hook 6 of a wing 5 of the first section 1a with the end weft thread 3 of a wing of the second section 1b. by inclining the first section la relative to the second section 1b.

In a second step, the operator exerts a pressure on the unengaged wing 5 of the first section la to fold it elastically towards the bottom 4 of the section 1a and then lowers the first section 1a so that the bottom 4 of the first section 1a and the bottom 4 of the second section 1b are coplanar and the hooks 6 of the bottom 4 of the first section 1a are engaged with the end weft wire 3 of the second section 1b. Finally, in a third step, the operator releases the pressure exerted on the wing 5 of the first section la so that it returns to its initial position, the hook 6 of the wing 5 of the first section coming to it, at its turn, engaged with the end weft wire 3 of the second section lb. The reverse procedure makes it possible to separate the two sections 1a, 1b from each other. The inserting parts 10 may be manufactured prior to the manufacture of a ply 14 of wire mesh or at the same time and parallel to this manufacture of ply 14. C008 B060 EN - TQD The attached assembly parts are welded on two son 3 weft 3, between two warp son 2, so that the hook 6 is perpendicular to the ply 14 and only the hook 6 protrudes from the ply 14.

The webs 14 provided with the attached assembly parts 10 can be stored, transported, in particular on pallets. The storage in the form of a sheet 14 makes it easier to transport, the sheets 14 requiring less space than the sections 1a, 1b.

The volume of the mesh strips for the production of sections 1a, 1b by folding can be carried out later, if necessary away from the manufacturing site of the plies 14. The deformation of the son 13 to form the hooks 6 can be carried out directly to the manufacture of the plies 14 or later, the presence of the son 13 thus does not interfere with the transport or storage of the plies 14. The sections 1a, 1b including insert parts 10, provide one of the advantages - and preferably all the following advantages: - simplicity of manufacture: the assembly parts 10 are made separately from the mesh by folding wires, then reported thereon being for example welded to the weft son 3, without modification warp yarns 2 and / or weft threads 3 of the lattice, and using the same thread as that used to produce the lattice; - High production rate: the fixing of reported assembly parts 10 requires little additional time for the supply and welding of assembly parts 10 made parallel in masked time; - Easy installation of cable trays: first, no tools are necessary; secondly, thanks to the transverse interlocking sectionsa, 1b, the operator does not care to have room for maneuvering at the ends of sectionsla, 1b, which would be necessary for a longitudinal interlocking; C008 B060 EN - TQD - good mechanical strength of a cable path 1 made by assembling at least two sections 1a, 1b: adjacent to the end weft wire 3, the hooks 6 have a maximum rigidity which gives the cable 1 assembly a good rigidity, both in flexion and in shear at the interface between the sections 1 a, 1 b. C008 B060 FR - TQD

Claims (8)

REVENDICATIONS1. Cable tray section (1a, 1b) (1a, 1b) comprising: - a wire mesh formed by assembling warp yarns (2) defining a longitudinal direction and weft yarns (3) forming a bottom (4) and two wings (5) and defining a transverse plane; - hooks (6) projecting from one end of the section (1a, 1b) on the bottom (4) and the wings (5) thereof for attachment to an adjacent section (1a, 1b), each hook (6) forming a recess (8) recessed, concavity facing outwardly of the section (la, lb), located at the height of the son (3) frame; characterized in that each hook (6) belongs to an assembly piece (10) attached to the wire mesh. 2. Section (1a, 1b) according to claim 1, characterized in that the insert part (10) reported is formed by folding a wire. 3. Section (1a, 1b) according to any one of the preceding claims, characterized in that the insert part (10) reported comprises a portion (11) of attachment, formed of a wire, to secure the piece on the section (1a, 1b). 4. Section (1a, 1b) according to any one of the preceding claims, characterized in that the insert part (10) reported is welded to two son (3) of the weft section (1a, 1b) by its portion (11) of attachment. 5. Section (1a, 1b) according to any one of the preceding claims, characterized in that the or each piece of assembly (10) attached to the bottom (4) comprises two longitudinal son connected to a free end, by a transverse connection. 6. Section (1a, 1b) according to claim 5, characterized in that the connection is in the form of a wire (12) bent at C, inclined relative to the bottom (4) of the section (1a, 1b). ). 7. Section (1a, 1b) according to any one of the preceding claims, characterized in that the hook (6) of the insert part (10) reported is tangent to the weft thread (3) end of section (la, lb). 8. Path (1) of cables made by assembling at least two sections (1a, 1b) according to any one of the preceding claims.