Title of Invention

A SEAL HAVING A SEALING MEMBER BETWEEN SUPPORT MEMBERS WITH PERIPHERAL CHANNELS FOR RECEIVING ELONGATE ARTICLES

Abstract A seal (1) having a sealing member (3) between support members (2a, 2b) with peripheral channels (8a, 8b) for receiving elongate articles (9), said seal comprises: a first support member (2a) having in its periphery a plurality of channels (8a) adapted to accommodate an elongate article; a second support member (2b), in use longitudinally spaced from the first support member, the second support member having in its periphery a plurality of channels (8b) corresponding to those of the first support member; a sealing member (3) situated between the first and second support members; and a connecting member (4) for connecting the first support member (2a), the second support member (2b) and the sealing member (3), characterised in that the support members (2a, 2b) comprise a substantially cylindrical body, said plurality of channels (8a, 8b) extending longitudinally so as to support the elongate articles (9) over part of their length, and the sealing member (3) has outer dimensions which are greater than the inner dimensions of the longitudinally extending channels (8a, 8b) so that an elongate article (9) accommodated in those channels needs to deform the sealing member (3). Figure 1.
Full Text The present invention relates generally to a seal, and more specifically to a seal for sealing
> an aperture in an object through which one or more elongate article extends and to objects
including such a seal.
The present invention finds particular utility as a seal for protecting junctions between elongate articles such as pipes, tubes or cables. The term "cable" will be understood hereinafter to include both conductive cables and bundles of optical fibres. When it is necessary to make connections between elongate articles such as pipes, tubes or cables the junction or splice where such article are joined end-to-end is necessarily less strong and less resistive to environmental agents liable to cause deterioration over time than the article itself.
In the production of, for example, cable systems such as telecommunication or power transmission systems, it is frequently necessary to make splices either to join cables end-to-end or to make a branch. The cables and the splices may be located underground, in conduits or in other environments, inside or outside buildings, but in any event are always at risk to the ingress of environmental agents such as moisture or dust. Underground installations are also subject to pressure, and in particular hydrostatic pressure, whilst above-ground installations suffer from diurnal thermal variations. In order to provide environmental protection for splices in cables or other elongate articles various protective measures are known. Systems utilising an enclosing casing have been found to be particularly valuable. Such casings or enclosed containers have a housing for enclosing the

cable connections or splices and at least one aperture in the housing wall through which the cable or cables can extend. To ensure adequate protection a seal should be provided for any such aperture.
There is a need for a seal for sealing an aperture in an object which has a simple construction, is easy to install and provides a good sealing performance.
According to a first aspect of the present invention there is provided a seal for sealing an aperture in an object "through which aperture one or more elongate articles extends, which seal comprises:
a first support member having at least one longitudinally extending channel adapted to accommodate and support an elongate article;
a second support member in use longitudinally displaced from the first support member, the second support member having at least one longitudinally extending channel corresponding to that of the first support member; and
a sealing member situated between the first and second support members, the arrangement being such that to accommodate an elongate article within the longitudinal extending channel of the first support member so as to extend through the corresponding channel on the second support member it is necessary for the sealing member to be deformed from its rest configuration.
The present invention not only provides a good seal but also performs the function of gripping the elongate article with respect to the aperture. The deformation of the sealing

member by the elongate articles causes the sealing member to seal between and around those
articles.
The first and second support members are preferably substantially identical to one another.
They may be an integral component, in which case they are joined together by a connecting
member. Alternatively the first and second support members may be separate components,
which may be optionally joined together by a connecting member which may be integral
with one of them.
Each or both of the support members preferably takes the form of a substantially cylindrical '
body having the said at least one longitudinally extending channel in its periphery. It is
-preferred that each support member be provided with a plurality of longitudinally extending
channels. The channels are open to and extend from the outer periphery of the support
member and may take any desired shape or form so as to accommodate the elongate article
with which the seal is to be used. They may, for example, be substantially U or V shaped
channels. For the accommodation of any connecting member the or each support member
may be provided with a longitudinally extending hole, preferably central of the support
member and parallel to its longitudinal axis.
The or each support member may be formed from any suitable material and may be elastomeric or rigid in nature. The or each support member may, for example, be formed of a metal, such as aluminium or steel, a naturally occurring elastomeric material such as rubber, or a plastics material, e.g. a polyamide, polycarbonate or polyolefin such as polyethylene or polypropylene.

The sealing member preferably takes the form of a substantially cylindrical block of sealant material. The dimensions of the sealant material block, in particular its cross sectional width, should be at least as great as the corresponding dimension of the first and second support member. The outer dimensions of the sealant material block should, in particular, * be greater than the inner dimensions of the longitudinally extending channels so that an
y
elongate article lying in those channels needs to deform the sealant material in order for the /
elongate article not to be laterally deflected but to lie in a straight line. /
The sealing member may generally comprise any suitable sealant. A particular preferred sealant material is a gel sealant. The gel sealant may be any suitable gel or geloid sealant such as silicon, urea or urethane gel. It may take the form of a liquid, extended polymer composition gel sealant, with the polymer comprising an elastomer, or a block copolymer have relatively hard blocks and relatively elastomeric blocks. Examples of such copolymers include styrene-diene block copolymers or styrene-ethylene-propylene-styrene block copolymers. The extender liquids employed in the gel preferably comprise oils, such as naturally occurring hydrocarbon oils, synthetic oils or mixtures thereof. Preferred oils are mixtures of non-aromatic paraffins and naphthenic hydrocarbon oils. Such gels are well known in the prior art.
Any connector member when present may take any suitable form. It may, for example, take the form of a rod formed from any of the materials described above in relation to the first and second support members.

To assist in the support of the elongate articles within the longitudinally extending channels of the first and second support members, additional retaining means may be provided. Such means may take the form of tie wraps and/or tapes or strips. Cable gripping strips could, for example, be wound around the elongate articles either individually or in groups. Such a gripping strip, called an axial pull strip, is disclosed in WO96/09670, which document is incorporated herein by reference. Such strips increase the ability of elongate articles, such as cables, to withstand axial forces and where necessary increase the dimensions of the elongate articles to match the sizes of apertures in the casing.
Additional sealant material may be placed around the elongate articles and the central sealant material if required. Such further sealant material could be used in the form of a tape.
The seal of the present invention has a wide application for the sealing of objects having an aperture. It may, for example, be used as a duct seal, a grommet or "feed through" in a wall, or the bulkhead of a car or other vehicle. More preferably it may be used for the sealing of an aperture in a closed container for containing optical fibre or electrical splices or connections. Such a container may be supplied with seals according to the first aspect of the present invention pre-installed or the seals may be applied separately and installed when used. The seal is particularly suitable for sealing around several small diameter cables in a cable aperture of a cable splice closure.

According to a second aspect of the present invention there is provided a closed container for containing one or more cable splices or connections including a seal according to the first aspect of the present invention.
The container of the second invention may be a cable splice closure such as that described in
/ WO97/45904 which document is incorporated herein by reference. Such a container or
cable splice closure contains a housing having at least two parts or half-shells which may be
joined together or formed as separate components which are brought together to provide an j
i
enclosed container. In addition to the seal of the present invention a sealing material which seals the gap between the cable and housing as it passes through the enclosed container may also be provided. Such sealing material is preferably such that it comes under pressure in use, e.g. by closing the separate parts of the housing or by other means, e.g. by the provision of movable parts of the container. The container, and in particular its housing, may be formed from any suitable material such as those described above for the first and second support member.
The terms longitudinal and lateral refer in general to a direction substantially parallel and substantially perpendicular respectively to the direction in which the elongate article extends.
The present invention is advantageous over known sealing devices and is simpler to use, easier to manufacture and install and yet provides excellent mechanical and environmental protection at the same time as providing effective protection against forces, in particular axial (longitudinal) forces. The strain relief provided with the present invention is easier to achieve than prior art conventional methods requiring the individual wrapping of cables with

tape, which is more time consuming as the number of individual cables increases. The present invention also ensures that the cables remain separate, i.e. spaced from, each other to allow the sealing pressure of the sealant material to be well transferred between the cables.
For a better understanding of the present invention and to show how the same may be put into effect reference will now be made, for the purposes of illustration only, to the accompanying drawings in which:
Figure 1 is an exploded perspective view of a first embodiment of a seal according to the present invention;
Figure la and Figure lb show perspective views of the embodiment of Figure 1 with some of the components assembled;
Figures 2a to 2d is a series of perspective views showing several stages in the assembly of the embodiment shown in Figure 1 in use;
Figure 3 is a perspective view of a second embodiment of the present invention; and
Figure 4 shows a container according to the second aspect of the present invention for use with the seal shown in Figures 1 and 2 or 3.
The seal 1 shown in Figure 1 comprises two support members 2a, 2b formed from an elastomeric material such as rubber or a rigid material such as polypropylene. The two support members 2a, 2b, are laterally displaced from each other and sandwiched between them is a block of sealant material 3. Interconnecting the two support members 2a, 2b is an interconnecting rod 4 of polypropylene. The interconnecting rod is a circular cylindrical rod which passes through circular cylindrical bore holes 3a, 3b provided in the support members 2a, 2b, the interconnecting rod 4 is provided with a portion of increased diameter 6 which

supports the sealant material block 3 by engaging in an axial bore hole 7 as shown in Figure la.
Each of the support members 2a, 2b is provided with a plurality of longitudinally extending channels 8a, 8b radially arranged around their cylindrical periphery.
As shown in Figure 2a, elongate articles such as fibre optic cables 9 can be accommodated within the longitudinally extending channels 8a, 8b so as to lie substantially parallel to one another. The dimensions of the sealant material block 3 is such that in order to t
• i
accommodate the cables 9 within the corresponding channels 8a, 8b the sealant material
must be squashed by the cables and in doing so is pushed out around at least part of the ■
cables so as to seal between them. I
As additional securing means tie wraps 10 may be wrapped around the cables positioned on the seal 1 as shown in Figure 2b. to provide added strength against axial forces an axial pull strip 11 may also be wrapped around the bundles of cables positioned on the seal as shown in figure 2c. In order for large diameter apertures or ports to be accommodated additional sealing material such as a gel tape 12 may be wrapped around the deformed sealant material block 3.
In the second embodiment shown in Figure 3, rather than the first and second support members being separate components interconnected by a separate interconnecting rod, the first 13 and second 14 support members are formed as an integral component with an

integral interconnecting rod 15 extending therebetween. Such an integral component is advantageously formed from a rigid material such as polypropylene.
The seal of the present invention, including the first and second embodiments described above are of use as a cable seal for sealing around several small diameter cables in a cable aperture of a cable splice closure. Such a cable splice closure 16 is shown in Figure 4. The closure 16 is formed from two separate housing parts 17a, 17b which fit together to form an enclosed container. The end 18 of the closure has cable apertures 19, which are formed by the fitting together of the two housings parts 17a, 17b which are provided with U shaped cut outs in the end wall 18. A longitudinally spaced wall 20 defines with the end wall 18 a cavity 21. The seal will fit in to one of the cable apertures 19 such that the central sealant material block 3 is accommodated within the cavity 15 and the support members 2a, 2b or 13, 14, and axial pull strip 11 where present, interlock with the profiled internal surfaces of the walls 20.



CLAIMS
1. Seal (1) for sealing an aperture in an object through which aperture at least one elongate article (9) extends, which seal comprises:
• a first support member (2a) having in its periphery a plurality of channels (8a) adapted to accommodate an elongate article;
• a second support member (2b), in use longitudinally spaced from the first support member, the second support member having in its periphery a plurality of channels (8b) corresponding to those of the first support member;
• a sealing member (3) situated between the first and second support members; and
• a connecting member (4) for connecting the first support member (2a), the second support member (2b) and the sealing member (3), characterised in that
• the support members (2a, 2b) comprise a substantially cylindrical body, said plurality of channels (8a, 8b) extending longitudinally so as to support the elongate articles (9) over part of their length, and in that
• the sealing member (3) has outer dimensions which are greater than the inner dimensions of the longitudinally extending channels (8a, 8b) so that an elongate article (9) accommodated in those channels needs to deform the sealing member (3).

2. Seal according to claim 1, wherein the sealing member (3) comprises gel sealant.
3. Seal according to claim 1 or 2, wherein the connecting member (4) is provided with a portion (6) of increased diameter for supporting the sealing member (3),
4. Seal according to any of the preceding claims, wherein the connecting member (4) is integral with the first support member (2a).

5. Seal according to any of the preceding claims, wherein the connecting member (4) is integral with the second support member (2b).
6. Seal according to claims 4 or 5, wherein the connecting member (3) is formed from a rigid material, preferably polypropylene.
7. Seal according to any of the preceding claims, further comprising at least one tie wrap (10) for positioning the elongate articles (9).

8. Seal according to any of the preceding claims, further comprising at least one axial pull strip (11) for providing axial pull relief.
9. Seal according to any of the preceding claims, further comprising at least one gel tape (12) for sealing around the sealing member (3).
10. Closure (16) for containing one or more cable splices or connections, the closure comprising two housing parts (17a, 17b) which fit together to form an enclosed container having at least one aperture (19), characterised in that the at least one aperture (19) accommodates a seal (1) according to any of the preceding claims.

11. Seal for sealing an aperture substantially as herein described with
reference to the accompanying drawings.
12. Closure for containing one or more cable splices or connections
substantially as herein described with reference to the accompanying
drawings.


Documents:

abs-in-pct-2000-892-che.jpg

in-pct-2000-892-che-abstract.pdf

in-pct-2000-892-che-claims filed.pdf

in-pct-2000-892-che-claims granted.pdf

in-pct-2000-892-che-correspondence others.pdf

in-pct-2000-892-che-correspondence po.pdf

in-pct-2000-892-che-description complete filed.pdf

in-pct-2000-892-che-description complete granted.pdf

in-pct-2000-892-che-drawings.pdf

in-pct-2000-892-che-form 1.pdf

in-pct-2000-892-che-form 19.pdf

in-pct-2000-892-che-form 26.pdf

in-pct-2000-892-che-form 3.pdf

in-pct-2000-892-che-form 5.pdf

in-pct-2000-892-che-pct.pdf


Patent Number 202346
Indian Patent Application Number IN/PCT/2000/892/CHE
PG Journal Number 05/2007
Publication Date 02-Feb-2007
Grant Date 05-Oct-2006
Date of Filing 27-Dec-2000
Name of Patentee TYCO ELECTRONICS RAYCHEM NV
Applicant Address Diestsesteenweg 692, B-3010 Kessel-Lo
Inventors:
# Inventor's Name Inventor's Address
1 DAMS, Francis Bergstraat 150, B-3010 Kessel-Lo
2 VANDEPUTTE, Filip Kortrijkstraat 96, B-3210 Linden
3 DERIJCK, Jan Langestraat 77, B-3220 St. Pieters Rode
4 ROOSEN, Dirk Meendijk 54, B-3300 Tienen
PCT International Classification Number F16L3/223
PCT International Application Number PCT/GB1999/001898
PCT International Filing date 1999-06-15
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 9814399.3 1998-07-03 U.K.