AU732948B2

AU732948B2 - Cable support device

Info

Publication number: AU732948B2
Application number: AU59511/98A
Authority: AU
Inventors: Bernhard Gegenbauer
Original assignee: Felten and Guilleaume Austria AG
Current assignee: Felten and Guilleaume Austria AG
Priority date: 1997-03-26
Filing date: 1998-03-25
Publication date: 2001-05-03
Anticipated expiration: 2018-03-25
Also published as: FR2761568A3; IT243875Y1; CZ7490U1; ES1039769U; ITMI980198U1; ES1039769Y; AT2346U1; FR2761568B3; AU5951198A; DE29804458U1

Description

IF/U/U1 1 2a(5/91 Regulation 3.2(2)

AUSTRALIA

Patents Act 1990

ORIGINAL

COMPLETE SPECIFICATION STANDARD PATENT Application Number: Lodged: 0 0 0 Invention Title: CABLE SUPPORT DEVICE The following statement is a full description of this invention, including the best method of performing it known to us CABLE SUPPORT DEVICE The invention relates to a cable support for a buried wall case.

With known buried wall cases, the attachment of cables inserted into the buried wall case is a problem.

The cable support to attach cables in an electrical installation, in particular a distribution or metre box, is described in AT 446 Ul. In this known device, undercut notches are provided on the horizontal edges of the bottom plate of a tub of a buried wall case, where cable binders can be attached to fasten cables in the area of the edges of the bottom plate of the tub, after the cables have been inserted into the installation device, e.g. the distribution box or meter box. A disadvantage with these known embodiments is not only their complicated structure with a number of undercut notches, but also the fact that cables can only be fixed at the positions determined by the notches. This often results in difficulties when several cables are to be inserted.

A similar cable support is known from DE 43 44 144 Al which has elbows in a comb-like row arrangement on which the cables can be attached with cable binders.

A further disadvantage is that the known support devices for cables can only supply low extraction forces and the security of the cable attachment 20 depends solely on how firmly the cable binders have been fastened.

An object of the present invention is to solve one or more of the problems S• in the prior art, or to provide an improvement or alternative thereto.

:Another object of the present invention is to provide a cable support for buried wall cases where the cables can be fastened at any point of the cable support device.

A preferred object is to provide a cable support which achieves higher extraction forces.

According to the present invention, there is provided a cable support device for fastening cables in an electrical installation, the device including a tub with side walls and a bottom plate, and flange plates inserted between the ends of the side walls, wherein in the area of at least one of the edges of the bottom plate of the tub extending between the side walls a cable support strip being aligned parallel to this edge of the bottom plate is provided, and wherein the cable support strip is arranged at a distance from the edges of the bottom plate of the tub and is connected to the bottom plate via at least two bridges which are vertical to the cable support strip.

Preferably, the tub and the cable support strip are made in one piece from plastic.

The tub and the cable support strip may be made by injection moulding.

Preferably, the cable support strip has a friction increasing profile on its surface facing the cables.

Preferably, the cable support strip has a longitudinal edge on its surface facing the cables.

The surface of the cable support strip facing the cables may be chamfered away from the edge.

An edge strip with a chamfered surface may be provided adjacent to the cable support strip of the bottom plate of the tub.

S The cable support strip may be hollow and open at the bottom.

20 The edge strip with its chamfer on the edges of the bottom plate of the tub may be made in one piece with the bottom plate.

The cable support strip may be continuous over its entire length.

The cable supportdge strip may be continuous over its entire length.

The edge strip may be continuous over its entire length.

The device may be arranged and adapted to be used in a distribution 25 cabinet or a meter box.

In a preferred embodiment of the invention, due to the fact that with the cable support device according to an embodiment of the invention a sharp, upwards-pointing edge is provided on a cable support strip, not only a frictional connection but also a solid connection is achieved between cable and cable support device, because the shape edge 8 digs into the cable sheath, resulting in considerably higher extraction forces.

2a In order that the present invention might be more fully understood, an embodiment of the invention will be described by way of example only, with reference to the accompanying drawings in which: Fig. 1 shows the tub of a buried wall case, Fig. 2 shows a cross-section through the tub of a buried wall case shown in Fig. 1, Fig. 3 shows the tub of a buried wall case from Fig. 1 with a flange plate, Fig. 4 the tub with the flange plate inserted, Fig. 5 the tub with the flange plate inserted as seen from the outside.

Referring to the drawings, a buried wall case tub 1 shown in Fig. 1, as used e.g. for buried distribution boxes, includes a bottom part 2 with two side walls 3, preferably projecting from the short sides of, and made in one piece with, the bottom part. Usually the tub will be bricked in in such a manner that the side walls are vertical.

The device of the exemplary embodiment is arranged and adapted to be used in a distribution cabinet or a metre box.

In the area of the clear edges 4 of the tub 1, cable supports 5 are provided.

The cable supports 5 consist of a cable support strip 6 parallel to edge 4, where the strip 6 in the embodiment shown is connected to the bottom 2 of tub 1 by 20 means of three bridges 7. Those surfaces of the cable support strips 6 facing up, i.e. in direction of the side walls 3 of tub 1, are chamfered, resulting in sharp lengthwise edges 8. Next to the cable support strips 6, formed edge strips 9 are provided o •o on the edge 4 of bottom 2. The edge strips 9 have chamfered surfaces 10, through which a cable binder 11 which is advanced parallel to a cable 12 (fig. 1) to bottom 2 is redirected up, so that threading the cable binder 11 through to fasten a cable 12 in the area of the cable support 5 is easily possible. Due to the sharp edge 8 on the cable support strip 6 in conjunction with the cable binder 11, in addition to the frictional connection a solid connection is achieved, because the sharp edge 8 digs into the cable sheath, resulting in considerably higher extraction forces. With the cable support device 6 it is easily possible to use two or more cable binders 11 per cable 12.

Flange plates 15, which are to be inserted between the side walls 3 of tub 1 to form an all round sealed buried wall case, have (see fig. 3) straight and bent perforations surrounding wall sections 16, so that wherever a cable 12 has been attached to cable support 5, a path for the cable can be made by breaking off these sections.

One advantage of the cable support 5 on tub 1 is that a cable 12 does not have to be attached in .ooooi a specific position on a tooth, but may be attached anywhere along the entry section of the cable support The flange plates 15 to be inserted between the side walls 3 of the tub 1 have a wall section 17, in the area of which the wall sections 16 which can be broken off are provided, an edge strip 18 running lengthwise, and strips forming the side end surfaces 19. Adjacent to the strips, on both ends of the flange plate 15, are contact surfaces 20 protruding towards the tub 1, ie.

towards the inside, parallel to the plane of the flange plate The contact surfaces 20 on the ends of flange plates 15 are provided with corresponding surfices 21 on the ends of side walls 3 of the tub 1, vertically to the side walls 3, where the surfaces 21 make firm contact with the contact surfaces 20 when the flange plates are inserted, so that flange plate 15 is exactly guided along the direction of side walls 3 of tub 1. In addition, correct guidance is ensured by means of L-shaped guidance rails 22 on the ends of the side walls 3, surrounding the strips of flange plates 15, so that the contact surfaces 20 on flange plates 15 also push against the corresponding surfaces 21 of the side walls 3. Due to the overlaps thus created, the penetration of concrete water or mortar is prevented when the buried wall case is bricked in.

The guiding rails 22 are arranged and adjusted with respect to the strips on the flange plates such, that the inserted flange plates 15 are fixed in position transverse to their planes, ie. in direction of the plane of the side walls 3. This will also ensure firm contact is made between contact surfaces 20 and corresponding surfaces 21.

With the buried wall case (see fig. 4) it is provided that between the flange plate end surfaces 19, generated by the strips, and the opposite bottom surfaces 25 of the grooves on edges 26 of side walls 3 of tub 1, a clearance X exists transverse to side walls 3, ie. in direction of the plane of flange plates 15. Thus the insertion of the flange plates 15 into tub 1 to form a buried wall case will be possible even if the side walls 3 of tub 1 have been deformed.

The flange plates 15 are attached to tub 1 by means of spring latches 31 with latch fingers where the spring latches are made in one piece with the tub 1 and where the latch fingers engage behind latch blocks 32 on the external surface of flange plates oi ooo i The buried wall case embodiment described, consisting of tub 1 with bottom plate 2 and side walls 3, as well as flange plates 15, prevents the problems arising during insertion of the flange plates 15, even if the tub 1 becomes deformed due to pressure occurring during the bricking-in process. With the construction described, the inevitable problem of the deformation of the tub 1 of plastic buried wall cases during bricking-in is solved, because clearance X exists between the ends 26 of side walls 3 of tub 1 and end surfaces 19 of flange plates 15. In this manner, the easy removal and insertion of flange plates 15 (bottom, respectively lid) is ensured.

It is further of advantage that, with the construction of a buried wall case as described, the penetration of concrete water and mortar into the buried wall case is prevented due to the firm contact between the surfaces 21 projecting from side walls 3 and the surfaces 20 on the ends of the flange plates In summary, a preferred embodiment of the cable support device can be described as follows: A cable support device 5 for fastening cables 12 on buried wall cases for electrical installations consists of a cable support strip 6 which is connected to an edge strip 9 of bottom plate 2 at a distance, and which extends between opposite side walls 3 of the buried wall case. On that surface of the cable support strip facing the cables 12 to be inserted and fastened, an edge is provided. When fastening a cable 12 to the cable support strip by means of a cable binder 11, the edge 8 digs into the sheath of cable 12, thus rendering a frictional and solid connection between cable 12 and cable support strip 6. The surface of edge strip 9 facing the cable support strip has a chamfer 10 which facilitates the insertion of cable binders parallel to the cables 12 to be fastened.

Claims

1. Cable support device for fastening cables in an electrical installation, the device including: a tub with side walls and a bottom plate, and flange plates inserted between the ends of the side walls, wherein, in the area of at least one of the edges of the bottom plate of the tub extending between the side walls, a cable support strip being aligned parallel to this edge of the bottom plate is provided, and wherein the cable support strip is arranged at a distance from the edges of the bottom plate of the tub and is connected to the bottom plate via at least two bridges which are vertical to the cable support strip.

2. Device according to claim 1, wherein the tub and the cable support strip are made in one piece from plastic.

3. Device according to claim 2, wherein the tub and the cable support strip i are made by injection moulding.

4. Device according to any one of claims 1 to 3, wherein the cable support o strip has a friction increasing profile on its surface facing the cables. o* o• Device according to claim 4, wherein the cable support strip has a longitudinal edge on its surface facing the cables.

6. Device according to claim 5, wherein the surface of the cable support strip facing the cables is chamfered away from the edge.

7. Device according to any one of claims 1 to 6, wherein an edge strip with a chamfered surface is provided adjacent to the cable support strip of the bottom plate of the tub.

8. Device according to any one of claims 1 to 7, wherein the cable support strip is hollow and open at the bottom.

9. Device according to claim 7 or 8, wherein the edge strip with its chamfer on the edges of the bottom plate of the tub is made in one piece with the bottom plate. Device according to any one of claims 1 to 9, wherein the cable support strip is continuous over its entire length.

11. Device according to any one of claims 1 to 10, wherein the edge strip is continuous over its entire length.

12. Device according to any one of the preceding claims wherein the device is arranged and adapted to be used in a distribution cabinet or a meter box.

13. Use of the device according to any one of claims 1 to 11 in a distribution cabinet or a meter box.

14. A cable support device for fastening cables in an electrical installation l substantially as hereinbefore described and illustrated with reference to the accompanying drawings. DATED this 31st day of January 2001 FELTEN GUILLEAUME AUSTRIA AG WATERMARK PATENT TRADEMARK ATTORNEYS 290 BURWOOD ROAD HAWTHORN VICTORIA 3122 AUSTRALIA SKP/RJ/MEH P10761AU00.DOC