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Title:
A CABLE TRAY
Document Type and Number:
WIPO Patent Application WO/2022/079620
Kind Code:
A1
Abstract:
According to the invention, a cable tray with a first and second end is provided, which first end of the cable tray is coupleable with a second end of another cable tray, preferably a similar or identical cable tray. The cable tray comprises a wire mesh, which wire mesh comprises longitudinal wires and U-shaped transverse wires, in which the longitudinal wires and transverse wires define a first and second end of the cable tray, wherein a first transverse wire forms part of the first end and a last transverse wire forms part of the second end, and the longitudinal wires and the transverse wires define two side walls. Each side wall comprises at least one extended longitudinal wire which protrudes over a piece of wire beyond the last transverse wire, which piece of wire forms part of the second end of the cable tray. The extended longitudinal wire intersects both the first and the last transverse wire, and the height at which the extended longitudinal wire intersects the first transverse wire differs from the height at which the extended longitudinal wire intersects the last transverse wire.

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JP5835987Wire harness
Inventors:
BALLET GEERT (BE)
Application Number:
PCT/IB2021/059385
Publication Date:
April 21, 2022
Filing Date:
October 13, 2021
Export Citation:
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Assignee:
TRAYCO INC (BE)
International Classes:
H02G3/04; H02G3/06
Foreign References:
EP2276129A12011-01-19
FR3007591A12014-12-26
GB2485071A2012-05-02
Attorney, Agent or Firm:
WIM VAN STEENLANDT, IP HILLS NV (BE)
Download PDF:
Claims:
Claims

1.- Cable tray with a first and second end, which first end of the cable tray is coupleable with a second end of another cable tray, the cable tray comprising a wire mesh, which wire mesh comprises longitudinal wires and U-shaped transverse wires, in which:

- the longitudinal wires and transverse wires define a first and second end of the cable tray, wherein a first transverse wire forms part of the first end and a last transverse wire forms part of the second end,

- the longitudinal wires and the transverse wires define two side walls, wherein each side wall comprises at least one extended longitudinal wire which protrudes over a piece of wire beyond the last transverse wire, which piece of wire forms part of the second end of the cable tray, and wherein the extended longitudinal wire intersects both the first and the last transverse wire, and the height at which the extended longitudinal wire intersects the first transverse wire differs from the height at which the extended longitudinal wire intersects the last transverse wire.

2.- Cable tray according to Claim 1 , wherein the difference in height between the height at which the extended longitudinal wire intersects the first transverse wire and the height at which the extended longitudinal wire intersects the last transverse wire is at least equal to the thickness of the extended longitudinal wire.

3.- Cable tray according to any of the preceding claims, wherein it is the case for each of the side walls individually that the extended longitudinal wires situated in this side wall are coplanar between the first and last transverse wire.

4.- Cable tray according to any of the preceding claims, wherein it is the case for each of the side walls individually that all longitudinal wires situated in this side wall are coplanar between the first and last transverse wire.

5.- Cable tray according to any of the preceding claims, wherein the side walls are parallel.

6.- Cable tray according to any of the preceding claims, wherein the protruding piece of wire of the extended longitudinal wire has a hook shape, which hook shape can hook around a first transverse wire of a first end of another cable tray.

7.- Cable tray according to Claim 6, wherein each extended longitudinal wire, behind each hook shape, also comprises a piece of wire which is coplanar with the piece of wire which protrudes beyond the last transverse wire.

8.- Cable tray according to any of the preceding claims, wherein at least one pair of juxtaposed extended longitudinal wires is present in each of the side walls, and wherein the extended longitudinal wires of this pair run towards each other before the last transverse wire.

9.- Cable tray according to any of the preceding claims, wherein at least two extended longitudinal wires are present in each of the side walls, and wherein the end of each of the extended longitudinal wires in a side wall is coupled to at least one end of another of the extended longitudinal wires in this side wall by means of a transverse connecting piece.

10.- Cable tray according to Claim 9, wherein the connecting piece is a wire.

11 .- Cable tray according to any of the preceding claims, wherein the wire mesh comprises further longitudinal bottom wires, the bottom wires and the transverse wires define the bottom of the cable tray, at least one of the bottom wires is an extended bottom wire which protrudes over a piece of wire beyond the last transverse wire.

12.- Cable tray according to Claim 11 , wherein the piece of wire of the extended bottom wire has a hook shape in order to hook around a first transverse wire of a first end of another cable tray.

13.- Cable tray according to Claim 12, wherein at least two bottom wires are extended bottom wires, each extended bottom wire also comprises a piece of wire behind each hook shape which runs parallel with the piece of wire which protrudes beyond the last transverse wire, the end of each of the extended bottom wires is coupled to at least one end of another of the extended bottom wires by a transverse connecting element.

14.- Cable tray according to Claim 13, wherein the connecting element is a wire.

15.- Cable tray according to one of the Claims 11 to 1 , wherein at least three bottom wires are extended bottom wires. 16

16.- Cable tray according to any of the preceding claims, wherein each transverse wire extends from the top longitudinal wire in the one side wall to the top longitudinal wire in the other side wall.

17.- Cable tray according to any of the preceding claims, wherein the transverse wires intersect the longitudinal and/or bottom wires at right angles.

18.- Cable tray according to any of the preceding claims, wherein the longitudinal and/or bottom wires are situated on the outside of the cable tray.

Description:
A CABLE TRAY

Technical area

[01] The invention relates to cable trays, in particular to cable trays made of wire mesh. The cable trays according to the invention are coupleable with other cable trays in order thus to create composite cable trays along a relatively long length.

Prior art

[02] Cable trays made of wire meshes are known in the art. They are used to carry and guide cables and other wires, such as power cables and signal wires and the like which have to be laid over a relatively long distance. For example, cable trays are installed against the ceiling, at the top of the wall or above existing appliances and installations. In this way, the cables and wires supported in the cable tray no longer form an obstacle in the building or around the existing installations. In addition, the cable trays allow the supported cables and wires to be inspected in a simple manner, and allow the removal or replacement of such wires and cables in a simple manner.

[03] It is also known to construct such cable trays by fitting together smaller cable tray sections to form one long composite cable tray. The smaller sections are easier to handle and carry for the cable tray installer. In order to bring about the coupling between two successive cable tray sections, there are generally three ways to produce this kind of coupling.

[04] In a first way, a separate, specially designed coupling piece is fitted between two successive cable tray sections. This coupling piece connects both sections. It is laborious to have different pieces to hand during installation and it requires a fitter to be more organised during installation.

[05] In a second way, additional coupling elements are provided on the cable tray sections at one or both ends, for example additional specially bent or formed wires or elements which are welded onto the end of the cable tray. Providing these additional elements on the cable trays makes the production of the cable trays more expensive and laborious. [06] In a third way, for example in GB2485071 , the wires at both ends of the cable tray itself are bent into all kind of complicated shapes in order to cause the ends of the cable trays to be fastened to each other to a sufficient degree. Providing wires with these complicated shapes at both ends of the cable tray during production is also expensive and laborious.

Summary of the invention

[07] It is an object of the invention to provide coupleable cable trays which have little or no impact on the production complexity, and which only require a relatively small measure to be taken on one of the ends of the cable tray in order to produce coupleable cable tray ends.

[08] According to a first aspect of the invention, a cable tray with a first and second end is provided, which first end of the cable tray is coupleable with a second end of another cable tray, preferably a similar or identical cable tray. The cable tray comprises a wire mesh, which wire mesh comprises longitudinal wires and U-shaped transverse wires, in which:

- the longitudinal wires and transverse wires define a first and second end of the cable tray, wherein a first transverse wire forms part of the first end and a last transverse wire forms part of the second end,

- the longitudinal wires and the transverse wires define two side walls.

Each side wall comprises at least one extended longitudinal wire which protrudes over a piece of wire beyond the last transverse wire, which piece of wire forms part of the second end of the cable tray. The extended longitudinal wire intersects both the first and the last transverse wire, and the height at which the extended longitudinal wire intersects the first transverse wire differs from the height at which the extended longitudinal wire intersects the last transverse wire.

[09] An extended longitudinal wire is a longitudinal wire which is longer compared to the longitudinal wires. The extended longitudinal wire is longer than the longitudinal distance between the first and last transverse wire, including the thickness of the first and last longitudinal wire. The other, thus non-extended, longitudinal wires preferably have a length which is equal to the longitudinal distance between the first and last transverse wire, including the thickness of the first and last transverse wire. [10] The height at which the extended longitudinal wire intersects the first transverse wire is the height measured from the bottom of the cable tray. The bottom of the cable tray is the face defined by at least the two bottom wires in the wire mesh of the bottom of the cable tray. These are possibly transverse wires, but may also be elongate bottom wires, if present, which extend on the outside of the transverse wires.

[11] Since the extended longitudinal wire intersects both the first and the last transverse wires at a different height, the extended longitudinal wire of the first cable tray will be situated at a different height than the corresponding longitudinal wire of the second cable tray when fitting together a first and a second cable tray, i.e. at the location of the second end of the first cable tray which adjoins the first end of the second cable tray. The piece of wire which protrudes beyond the last transverse wire of the first cable tray may run below or above the corresponding longitudinal wire of the second cable tray, beyond the first end of the second cable tray. In this way, the extended longitudinal wire of the first cable tray at the first end of the second cable tray can be fastened to either the corresponding longitudinal wire of the second cable tray or the first transverse wire of the first cable tray in a simple manner.

[12] According to some embodiments, the difference in height between the height at which the extended longitudinal wire intersects the first transverse wire and the height at which the extended longitudinal wire intersects the last transverse wire may at least be equal to the thickness of the extended longitudinal wire. At the location of the last transverse wire, the extended longitudinal wire of the first cable tray will thus be situated at a different height than the corresponding longitudinal wire of the second cable tray at the first end of this second cable tray. The piece of wire which protrudes beyond the last transverse wire of the first cable tray may again run parallel to the bottom of the cable tray after this last transverse wire.

[13] Preferably, the extended longitudinal wires run parallel to the bottom of the cable tray everywhere, except between the penultimate and the last transverse wire, where the longitudinal wire follows a slope with respect to the bottom of the cable tray. In this way, it is possible to allow this extended longitudinal wire to intersect the first and last transverse wire at a different height. [14] According to some embodiments, it may be the case for each of the side walls individually that the extended longitudinal wires situated in this side wall are coplanar between the first and last transverse wire. According to some embodiments, it may be the case for each of the side walls individually that all longitudinal wires situated in this side wall are coplanar between the first and last transverse wire. In other words, the extended longitudinal wires and possibly all longitudinal wires form a face, being the face of the side wall, in each of the two side walls. None of the extended longitudinal wires and possibly none of the longitudinal wires between the first and last transverse wire are locally bent inside or outside the lateral face. This has the advantage that a very simple production method without too much complexity can be adopted to produce the majority of the cable tray.

[15] According to some embodiments, the side walls may be parallel to each other and preferably perpendicular to the bottom of the cable tray. These shapes facilitate the coupleability of two or more cable trays and make it easier to provide cable tray pieces which are required to produce corners or curves.

[16] According to some embodiments, the protruding piece of wire of the extended longitudinal wire may have a hook shape, which hook shape can hook around a first transverse wire of a first end of another cable tray. Preferably, this other cable tray is a similar or identical cable tray. Two successive cable trays can be click-fitted together and fastened to each other in a simple manner, so that they, together, form part of a longer cable tray. The first end of a cable tray does not have to have any specific features and may simply consist of a transverse wire to which longitudinal wires are connected. According to some embodiments, each extended longitudinal wire, behind each hook shape, may also comprise a piece of wire which runs parallel, or is even coplanar, with the piece of wire which protrudes beyond the last transverse wire.

[17] The hook shape may be U-shaped and the curved part of the U shape may form a circular arch with a radius equal to or greater than half the diameter of the first transverse wire. The circular arch of the U shape may form a central angle greater than or equal to 100° and smaller than or equal to 180°. Such hooks may be sufficient to allow a first cable tray, specifically the second end of a first cable tray, to be fastened to a first end of a second cable tray. [18] According to some embodiments, at least one pair of juxtaposed extended longitudinal wires may be present in each of the side walls, and wherein the extended longitudinal wires of this pair run towards each other before the last transverse wire.

[19] More particularly and preferably, cable trays are provided with a first and second end, which first end of the cable tray is coupleable with a second end of another cable tray, the cable tray comprising a wire mesh, which wire mesh comprises longitudinal wires and U-shaped transverse wires, in which:

- the longitudinal wires and transverse wires define a first and second end of the cable tray, wherein a first transverse wire forms part of the first end and a last transverse wire forms part of the second end,

- the longitudinal wires and the transverse wires define two side walls, wherein

- each side wall comprises at least one extended longitudinal wire which protrudes over a piece of wire beyond the last transverse wire, which piece of wire forms part of the second end of the cable tray, and wherein the extended longitudinal wire intersects both the first and the last transverse wire, and the height at which the extended longitudinal wire intersects the first transverse wire differs from the height at which the extended longitudinal wire intersects the last transverse wire, wherein the difference in height between the height at which the extended longitudinal wire intersects the first transverse wire and the height at which the extended longitudinal wire intersects the last transverse wire is at least equal to the thickness of the extended longitudinal wire,

- the protruding piece of wire of the extended longitudinal wire has a hook shape, which hook shape can hook around a first transverse wire of a first end of another cable tray, and

- at least one pair of juxtaposed extended longitudinal wires is present in each of the side walls, and wherein the extended longitudinal wires of this pair run towards each other before the last transverse wire.

[20] According to some embodiments, one or more pairs of juxtaposed extended longitudinal wires may be present in each of the side walls, wherein the extended longitudinal wires of each of the pairs run towards each other before the last transverse wire. These extended longitudinal wires do not intersect. Preferably, the difference in height for intersecting with the first and last transverse wire is equal for both extended longitudinal wires. However, the one extended longitudinal wire, for example the bottom one of the two extended longitudinal wires, may intersect the last transverse wire at a higher level than the first transverse wire. In relative terms, this extended longitudinal wire runs upwards with respect to the bottom of the cable tray. The other extended longitudinal wire, for example the top one of the two extended longitudinal wires, may intersect the last transverse wire at a lower level than the first transverse wire. In relative terms, this extended longitudinal wire runs downwards with respect to the bottom of the cable tray. The two extended longitudinal wires then taper towards each other. Preferably, the extended longitudinal wires run parallel between the first and penultimate transverse wire, and the extended longitudinal wires only have an inclination with respect to this parallel direction between the penultimate and last transverse wire.

[21] Such a pair or pairs of extended longitudinal wires, which pair or pairs of extended longitudinal wires are juxtaposed, and which run towards each other before the last transverse wire, in particular if they both have a hook shape, which hook shape makes them suitable to be hooked around a first transverse wire of a first end of another cable tray, can form more stable connections to the first transverse wire of another cable tray.

[22] According to some embodiments, at least two extended longitudinal wires may be present in each of the side walls, wherein the end of each of the extended longitudinal wires in a side wall is coupled to at least one end of another one of the extended longitudinal wires in this side wall by means of a transverse connecting piece. The connecting piece may be a wire. Possibly, all ends of each of the extended longitudinal wires in a side wall are coupled to each other. Possibly, the extended longitudinal wires in a side wall are coupled to each other in twos, i.e. in pairs. Preferably, each pair will be a pair for which it holds true that the extended longitudinal wires of this pair run towards each other before the last transverse wire. Providing such connecting pieces, for example wires, ensures that the ends of the extended longitudinal wires as such do not protrude into the cable tray. The sharper ends of such longitudinal wires may damage cables or wires which are pulled through the cable tray by incision or indentation of the insulating wall of the pulled cable or wire. Providing a connecting piece may improve guidance of wires or cables which are pulled in the cable tray and largely prevent the damage caused by providing the upright ends of the extended longitudinal wires of the cable tray with an even plane in the cable tray, for example a side wall of a wire.

[23] According to some embodiments, the wire mesh may comprise further longitudinal bottom wires, the bottom wires and the transverse wires define the bottom of the cable tray, at least one of the bottom wires is an extended bottom wire which protrudes over a piece of wire beyond the last transverse wire. The longitudinal bottom wires are wires which run from the first to the last transverse wire in the bottom of the cable tray. An extended bottom wire is a bottom wire which is longer compared to the bottom wires. The extended bottom wire is longer than the longitudinal distance between the first and last transverse wire, including the thickness of the first and last longitudinal wire. The other, therefore non-extended bottom wires, preferably have a length which is equal to the longitudinal distance between the first and last transverse wire, including the thickness of the first and last transverse wire. The bottom wires and the transverse wires also define a part of the two ends of the cable tray.

[24] The piece of wire of the extended bottom wire may have a hook shape in order to hook around a first transverse wire of a first end of another cable tray. These extended bottom wires may contribute to a stronger and stabler connection between two cable trays.

[25] This hook shape of an extended bottom wire may be U-shaped. The leg of the U shape closest to the last transverse wire may be longer than the leg of the U shape which is furthest from the last transverse wire, in which case the difference in length may be at least equal to or greater than the diameter of the longitudinal wire in the bottom. Extended bottom wires having such hook shapes can be attached to a first transverse wire, in which case the extended bottom wire may run on top of the corresponding bottom wire of the second cable tray behind the hook shape. In this way, none of the bottom wires of the two coupled cable trays have to change position or be modified. According to an alternative embodiment, the extended bottom wires may partly run obliquely in the bottom, so that the bottom wire of the first cable tray may come to lie next to the corresponding bottom wire of the second cable tray during coupling, for example hooking the extended bottom wires together.

[26] The U-shaped hook shape may have a curved part of the U shape which describes a circular arch having a radius equal to or greater than half the diameter of the first transverse wire. The circular arch may form a central angle which is greater than or equal to 100° and smaller than or equal to 180°.

[27] Preferably, the bottom wires end at the first transverse wire on the first end. The bottom wires which are not extended bottom wires can stop at the last transverse wire on the second end. An extended bottom is a bottom wire which is longer with respect to the other bottom wires. The extended bottom wire is longer than the longitudinal distance between the first and last transverse wire, including the thickness of the first and last transverse wire. The other, i.e. non-extended bottom wires, have a length which is possibly equal to the longitudinal distance between the first and last transverse wire, including the thickness of the first and last transverse wire.

[28] According to some embodiments, at least two bottom wires may be extended bottom wires. Each extended bottom wire may also comprise a piece of wire behind each hook shape which runs with the piece of wire which protrudes beyond the last transverse wire. The end of each of the extended bottom wires may be coupled to at least one end of another of the extended bottom wires by a transverse connecting element. The connecting element may be a wire. Providing such connecting pieces, for example wires, ensures that the ends of the extended bottom wires as such do not protrude into the cable tray and form no risk or a reduced risk of damage when cables or wires are being pulled into or through the cable tray.

[29] According to some embodiments, at least three bottom wires may be extended bottom wires. Possibly, all bottom wires are extended bottom wires, optionally with the exception of the bottom wire furthest to the left and the bottom wire furthest to the right which are positioned at the corner of the U shape of the transverse wires.

[30] According to some embodiments, each transverse wire may extend from the top longitudinal wire in the one side wall to the top longitudinal wire in the other side wall. Possibly, the first and last transverse wire differ in length, in case the top longitudinal wires are extended longitudinal wires and between penultimate and last transverse wire slopes downwards.

[31] According to some embodiments, the transverse wires and/or the longitudinal and bottom wires may intersect at right angles.

[32] The transverse, bottom and longitudinal wires are preferably of a similar embodiment, such as the metal from which the wires are made and the finish which the wires have been given. The transverse, bottom and longitudinal wires, and in particular the bottom and longitudinal wires, are preferably similar in diameter.

[33] According to some embodiments, the longitudinal and/or bottom wires may be situated on the outside of the cable tray. The transverse wires provide the inside of the cable trays. This arrangement facilitates coupling two cable trays.

[34] The independent and dependent claims indicate specific and preferred features of the embodiments of the invention. Features of the dependent claims may be combined with features of the independent and dependent claims, or with features described above and/or below, in any arbitrary suitable way, as would be clear to someone skilled in the art.

[35] The abovementioned and other features, characteristics and advantages of the present invention will be explained by means of the following examples of embodiments, optionally in combination with the drawings.

[36] The description of these exemplary embodiments is provided for the sake of clarification and is not intended to limit the scope of the invention. The reference numerals in the following description refer to the drawings. Identical reference numerals in possibly different figures refer to identical or similar elements.

Brief description of the figures

[37] In order to show the features of the invention in more detail, some preferred embodiments are described below by way of example and without being limited thereto, with reference to the accompanying drawings, in which:

• Fig. 1 shows a side view of a cable tray according to the invention;

• Fig. 2 shows a top view of a cable tray according to the invention; • Fig. 3 shows a perspective view of a cable tray according to the invention;

• Fig. 4 shows two cable trays according to the invention which have been fastened together; and

• Fig. 5 shows a detail of two cable trays according to the invention which have been fastened together.

Description of examples of embodiments

[38] The present invention will be described below by means of specific embodiments.

[39] It should be noted that the term "comprising", as used, for example, in the claims, should not be interpreted in a limiting sense, i.e. limited to the elements, features and/or steps mentioned thereafter. The term "comprising" does not rule out the presence of other elements, features or steps.

[40] Therefore, the scope of an expression "an object comprising the elements A and B” is not limited to an object which only contains the elements A and B. The scope of an expression "a method comprising the steps A and B" is not limited to a method which only contains the steps A and B.

[41] In the light of the present invention, these expressions only mean that the relevant elements and steps, respectively, of the invention are the elements and steps A and B, respectively.

[42] In the following specification, reference is made to "an embodiment” or "the embodiment". Such a reference means that a specific element or feature described by means of this embodiment is comprised in at least this one embodiment.

[43] However, the use of the terms "in an embodiment” or "in the embodiment” at various locations in this description does not necessarily refer to the same embodiment, although it may indeed refer to the same embodiment.

[44] Furthermore, the characteristics or the features may be combined in any suitable arbitrary manner in one or more embodiments, as would be clear to someone skilled in the art. [45] Fi gs. 1 , 2 and 3 show a cable tray 100 according to the invention from different angles. The cable tray has a first end 101 and a second end 102. The cable tray 100 comprises a wire mesh 103, which wire mesh comprises longitudinal wires 104, longitudinal bottom wires 105 and U-shaped transverse wires 106. The first transverse wire 161 forms part of the first end 101 and the last transverse wire 162 forms part of the second end 102. The bottom wires and the transverse wires define a bottom 107, the longitudinal wires and the transverse wires define two side walls 108 and 109. Each of the side walls 108 and 109 comprises two extended longitudinal wires 141 and 142, which run parallel between the first transverse wire 161 and the penultimate transverse wire 163 and intersect the transverse wires at right angles. The longitudinal wires 104 form the outside of the cable tray. Between the penultimate transverse wire 163 and the last transverse wire 162, the extended longitudinal wires 141 and 142 no longer run parallel. The top extended longitudinal wires 141 are inclined downwards. The bottom extended longitudinal wires 142 are inclined upwards. The absolute value of both angles of inclination is identical. Between the penultimate transverse wire 163 and the last transverse wire 162, the extended longitudinal wires 141 and 142 taper towards each other. The difference in height between the height where one of the longitudinal wires 141 or 142 intersects the first transverse wire 161 and the height where this longitudinal wire intersects the last transverse wire 162 is equal to the thickness of the longitudinal wire, for example 4mm. In the part of the cable tray between the first and last transverse wire, the extended longitudinal wires are coplanar in the plane of each of the side walls 108 and 109. The side walls 108 and 109 are at right angles to the bottom 107.

[46] When coupling two cable trays 100 and 1000, as is illustrated in Fig. 4 and Fig. 5, the extended longitudinal wires 141 and 142, respectively, will be situated next to the corresponding extended longitudinal wires 1041 and 1042 of the second cable tray 1000 at the coupling between the second end 102 of the first cable tray 100 and the first end 1001 of the second cable tray 1000. In this way, the extended longitudinal wires 141 and 142 can easily be coupled to the first of the transverse wires of the second cable tray 1000.

[47] In order to bring about this coupling, the extended longitudinal wires 141 and 142 are provided with a piece of wire 171 which protrudes beyond the last transverse wire 162. This piece of wire 171 consists of three parts, namely a first protruding part 172 which, immediately after the transverse wire 162, still runs parallel to the longitudinal wire between the first and last transverse wire, a U-shaped hook shape or part 173 and a subsequent part 174 which runs parallel to the longitudinal wire between the first and last transverse wire. The U shape of the part 173 has a curved piece which has a central angle of approximately 180°, and a radius which is half the diameter of the first transverse wire, for example a radius of 2mm. The length of the part 171 is chosen such that, when fastening the two cable trays 100 and 1000 together, the first transverse wire 1061 of the second cable tray 1000 will end up in the U shape of the parts 173 of the extended longitudinal wires. The protruding ends of the extended longitudinal wires 141 and 142 are still connected to each other by a connecting wire 175 which is fitted on the inside of the cable tray, on the ends of the extended longitudinal wires.

[48] The four bottom wires 105 are all extended bottom wires 151 which protrude over a piece of wire 152 beyond the last transverse wire 162. This piece of wire 152 consists of three parts, namely a first protruding part 153 which, immediately after the transverse wire 162, still runs parallel to the bottom wire 151 between the first and last transverse wire, a U-shaped hook shape or part 154 and a subsequent part 155 which runs parallel to the bottom wire between the first and last transverse wire. The U shape of the part 154 has a curved piece which has a central angle of approximately 180° and has a radius which is half the diameter of the first transverse wire, for example a radius of 2 mm. The leg of the U shape which is closest to the last transverse wire has a length which is greater than that of the other leg of the U shape. The difference in length between the legs is equal to the diameter of the bottom wire, for example 4 mm.

[49] The length of the part 155 is chosen such that when fastening the two cable trays 100 and 1000 together, the first transverse wire of the second cable tray 1000 will end up in the U shape of the parts 154 of the extended bottom wires. The shortened leg of the U shape of the hook of the bottom wire ensures that the part 155 of the bottom wire of the first cable tray will run above the corresponding bottom wire of the second cable tray during coupling. The protruding ends of the extended bottom wires 151 are furthermore connected to each other by a connecting wire 156 which is fitted on the inside of the cable tray on the ends of the extended longitudinal wires. [50] All wires are made of steel wires which have a diameter of 4 mm and have been galvanized. The length of the cable tray of the first transverse wire 161 up to the last transverse wire 162, including the transverse wires, is for example 504 mm. The protruding part of the longitudinal and bottom wires is 25 mm. The total length of the cable tray 200 is 529 mm. The height of the cable tray at the first end 101 is, for example, 59.5 mm, where the height of the cable tray at the second end 102 is, for example, 55,3 mm. The distance between the protruding parts 171 of the extended longitudinal wires at the second end 102 of the cable tray is, for example, 25 mm, including wires. This is equal to the distance between the extended longitudinal wires at the first end 101 of the cable tray, excluding wires. The total width of the cable tray is, for example, 215 mm, the width between the bottom wire which is furthest to the left and the bottom wire which is furthest to the right is 154 mm, including wires.

[51] It will be clear that, although the embodiments and/or the materials for providing embodiments according to the present invention have been discussed, various modifications or changes may be made without deviating from the area of application and/or the spirit of this invention. The present invention is by no means limited to the above-described embodiments, but may also be achieved according to different variants without departing from the scope of the present invention.