(19) |
|
|
(11) |
EP 1 464 914 B1 |
(12) |
EUROPEAN PATENT SPECIFICATION |
(45) |
Mention of the grant of the patent: |
|
08.02.2006 Bulletin 2006/06 |
(22) |
Date of filing: 11.03.2004 |
|
(51) |
International Patent Classification (IPC):
|
|
(54) |
Camouflage net
Tarnnetz
Filet de camouflage
|
(84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
|
(30) |
Priority: |
29.03.2003 GB 0307336 01.04.2003 GB 0307522
|
(43) |
Date of publication of application: |
|
06.10.2004 Bulletin 2004/41 |
(73) |
Proprietor: Amsafe Bridport Limited |
|
Bridport,
Dorset DT6 3QU (GB) |
|
(72) |
Inventors: |
|
- Beatty, Michael J.
Wareham
Dorset BH20 6AH (GB)
- Hennessy, Mark David
Bridport
Dorset DT6 5HQ (GB)
- Newman, Alan Cameron
Birdport
Dorset DT6 5BF (GB)
|
(74) |
Representative: Newstead, Michael John et al |
|
Page Hargrave
Southgate
Whitefriars
Lewins Mead Bristol BS1 2NT Bristol BS1 2NT (GB) |
(56) |
References cited: :
DE-C- 298 590 GB-A- 2 351 007
|
FR-A- 1 349 732 US-A- 2 349 993
|
|
|
|
|
|
|
|
|
Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
|
[0001] The present invention relates to nets.
[0002] Camouflage nets are used, particularly by the military, to conceal equipment and
personnel and enable them to blend in with their surroundings.
[0003] Traditionally, camouflage nets have consisted of a net comprising a plurality of
intersecting net strands, to which a garnish is attached. The garnish is a coated
fabric which may have visual and near infrared properties selected to match the terrain
where the camouflage net is to be used. The coated fabric may be incised to create
a three dimensional (3D) leafy effect, for example. In the latter case, the garnish
can be applied to the net in patches to create the look of vegetation from a threat
distance or as a complete cover (100%). The garnish may also have a printed or spray
painted pattern if required. In addition, radar reflecting/absorbing properties can
also be incorporated in the garnish if desired.
[0004] The nets may also comprise low emissivity fabrics which may be strategically placed
to cover hot areas of a concealed object in order to produce a multi-spectral camouflage
system.
[0005] The net mesh dimension in these traditional nets is typically in the region of 75mm
square. This can make the nets difficult to deploy since the mesh may snag on protruding
corners of the object to be concealed.
[0006] In addition to the traditional 3D nets, two dimensional (2D) nets are also commonly
used. These nets comprise a knitted or open mesh woven fabric with patterning. Radar
absorbing or reflecting properties can be incorporated in the yarns or as a finishing
process. Cutting down the line of site between image and target the 2D structure helps
to reduce the thermal signature of the object. These nets are not particularly suited
to woodland surroundings because of the lack of 3D effect although they are good in
desert surroundings for concealing the thermal signature of an object. However, heat
can build up within the supported structure due to the relatively small holes and
this can make it uncomfortable for any crew members beneath the structure. Additionally,
these 2D nets may have a garnish sewn into the knitted fabric to improve the 3D effect.
[0007] The visual appearance of such 2D nets is not as good as a patched net in woodland
conditions. Similarly, the lack of texture makes such a 2D net not as good for the
near and far infrared. However, the 2D nets are much easier to deploy than conventional
nets as there is much less snagging due to the substantially smaller mesh size.
[0008] US 2 349 999 A describes a net according to the preamble of claim 1.
[0009] It is the object of the present invention to alleviate some of the problems of the
prior art nets or at least to provide an alternative to them.
[0010] According to the present invention there is provided a net comprising a first net
mesh having a first mesh dimension and a first area and a second net mesh having a
second mesh dimension and a second area, the second mesh dimension being smaller than
the first mesh dimension and the second area being larger than the first area, wherein
the first and second net meshes are attached at or near their respective perimeters,
the arrangement being such that when the first net mesh is held taut with the second
net mesh below it, the second net mesh sags below the first net mesh.
[0011] In effect, such a net enables the best features of the 3D and 2D nets described above
to be realised. The first net mesh may conveniently be provided with a suitable garnish
and the relatively smaller net mesh dimension of the second net mesh can prevent the
net from snagging.
[0012] A further advantage enabled by the present invention is the sagging effect produced
between the second net mesh and the first net mesh which helps to improve the visual
performance of the overall net. The sagging material of the second net mesh can obscure
the line of sight of an observer. This is because as the second net mesh sags away
from the first net mesh it firstly falls downwards and then curves under the first
net mesh. As the second net mesh curves under the first net mesh this effectively
reduces the net mesh size as viewed from the side. Consequently, the sagging material
obscures the line of sight of an observer.
[0013] A yet further advantage enabled by the present invention is a reduction of the solar
loading of the second net mesh (2D structure). In a conventional 2D net heat can build
up due to the fact that the small holes tend to retain the heat. In a net according
to the present invention the garnish on the first net mesh shields the second net
mesh from the sun and the structure acts as a form of insulation thus providing a
better atmosphere within the supported structure.
[0014] The first net mesh is preferably a square mesh and may advantageously have a first
net mesh dimension of less than 75mm. Preferably the first net mesh dimension is in
the range from about 10mm to about 40mm square and more preferably the range is from
about 15mm to about 25mm square. The conventional net mesh for camouflage netting
is approximately 75mm square. By reducing the dimensions of the first net mesh this
further helps to reduce the likelihood of the net snagging.
[0015] Preferably the second net mesh has a mesh dimension in the range from about 1mm to
about 10mm. The second net mesh is preferably in the form of a sheet of fabric with
a plurality of uniform holes forming a mesh structure, for example, a fine polyester
mesh.
[0016] The second net mesh preferably further comprises at least one ventilation region
having a more open mesh than the general second mesh dimension. The mesh dimension
at the ventilation region(s) is more open than the second mesh dimension but it is
still a tighter mesh than the first net mesh. Typically, the mesh dimension of the
ventilation region may be in the range from about 5mm to about 15 mm. The ventilation
region(s) may be provided around the periphery of the second net mesh and/or in the
centre of the second net mesh. Alternatively, multiple ventilation regions may be
provided on the second net mesh. The location of the multiple ventilation regions
may be selected to provide ventilation at specific points in the deployed net structure.
This arrangement helps to provide a route for the convection of air. The second net
mesh has a small size net mesh which tends to prevent the circulation of air and hence
a heat build up can occur. The ventilation region has a slightly larger size net mesh
which allows the flow of air and helps to produce a chimney effect as cool air is
drawn through the net and exits through the ventilation region. The location of the
ventilation region may be selected to minimise detection by thermal imaging.
[0017] In an alternative embodiment the second net mesh may be provided with a collapsible
chimney structure. The collapsible chimney structure could be in the form of a gap
in the second net mesh defining a ventilation opening. In order to prevent the ventilation
opening snagging it could suitably be provided with a skirt of mesh material depending
downwardly from the perimeter of the ventilation opening. The skirt of mesh material
would preferably be made of the same material as the second net mesh and would preferably
have a length at least equal to the diameter of the ventilation opening. This would
help to reduce the snagging whilst preventing a build up of heat beneath the net.
[0018] For a better understanding of the present invention reference will now be made, by
way of example, to the accompanying figures in which:
Fig. 1 shows a perspective view of a camouflage net;
Fig. 2 shows a side view of a camouflage net;
Fig. 3 shows a side view of a camouflage net;
Fig. 4 shows a perspective view of a camouflage net;
Fig. 5 shows a photograph of a front view camouflage net;
Fig. 6 shows a photograph of a side view of the camouflage net of Fig. 5;
Fig. 7 shows a photograph of a front view of a camouflage net; and
Fig. 8 shows a photograph of a side view of the camouflage net of Fig. 7.
[0019] Referring now to Fig. 1, this is a simplified schematic diagram showing a camouflage
net 2 set up to conceal an object 4. The camouflage net 2 comprises a first net mesh
6 having a first mesh dimension of approximately 20mm square. The first net mesh 6
is constructed from a plurality of intersecting net strands. The net strands are conventional
polyester net strands but may be made from any suitable material. The first net mesh
6 is covered in a camouflage garnish (not shown). The garnish may be applied in patches
or as a complete covering. The net 2 is held up by support structures 8 in the form
of rigid metal poles. These polcs are spaced apart such that the first net mesh 6
is held taut over the object 4. A second net mesh 10 in the form of a lightweight
polyester fabric with a plurality of uniform holes is attached to the first net mesh
6 at a plurality of locations 12 along its periphery. The second net mesh 10 has a
smaller mesh dimension than the first net mesh 6. The mesh dimension of the second
net mesh is approximately 1mm. The second net mesh 10 is attached by means of plastic
cable ties but any suitable means may be used. The second mesh dimension is such that
it will not easily snag.
[0020] The area of the second net mesh 10 is larger than that of the first net mesh 6. Consequently,
the second net mesh 10 sags below the first net mesh 6 when the first net mesh 6 is
held taut. The degree to which the second net mesh 10 sags may be determined by the
difference in area between the first net mesh 6 and the second net mesh 10 and/or
the number of attachment points 12 along the periphery. For example, in Fig. 1 there
are 13 attachment points along the length of one side of the net 2. However, in the
net 2 shown in Fig. 2, there are fewer attachment points and consequently the net
2 will sag more. The sagging of the second net mesh cuts down the line of sight of
sensors at ground level. This effect will be explained in more detail with reference
to Figs. 6 and 8.
[0021] Fig. 2 shows a side profile of a net 2 set up to conceal an object 4. There are fewer
attachment points 12 between the first net mesh 6 and the second net mesh 10 than
in the net of Fig. 1 which results in the second net mesh sagging more.
[0022] Figs. 3 and 4 show a side view and perspective view respectively of another net 2.
In addition to the second net mesh 10 being attached to the first net mesh 6 at the
periphery, further attachment points 14 are provided in the forms of lines of stitching
which run parallel to the edges of the net 2 and help to gather the second net mesh
10. Alternatively, these further attachment points may be in the form of any suitable
ties.
[0023] Figs. 5-8 show the deployment of a net 2. The first net mesh 6 is tensioned such
that it is taut. Figs. 6 and 8 show side views of the nets 2 of Figs. 5 and 7 respectively
and it can be seen that the area of the second net mesh 10 is much larger such that
it sags below the first net mesh 6. The mesh dimension of the second net mesh 10 is
much closer than that of the first net mesh 10. The second net mesh 10 is attached
to the first net mesh 6 at a plurality of locations 12 along its perimeter. As can
be seen in Figs. 6 and 8, the second net mesh 10 sags below the first net mesh. The
second net mesh 10 curves down and around under the first net mesh 6 such that it
hangs substantially vertically near the points of attachment with the first net mesh
6 and lies substantially horizontal at it lowest point. Thus, the effective mesh dimension
of the second net mesh 10 decreases towards its lowest point. The closer the second
net mesh comes to being horizontal then the smaller the net mesh dimension appears
when viewed from the side. With a mesh dimension in the range of from about 1mm to
about 10mm the effective mesh dimension is reduced to the point that it is not possible
to see through the second net mesh 10. This has the result of obscuring the line of
sight of an observer and preventing the detection of an object concealed beneath the
net 2.
[0024] The first net mesh 6 is provided with an attached camouflage garnish 16. The garnish
16 may be a variety of colours as is common in the art. For example, a range of greens
and browns would be most suitable for forest or jungle camouflage whilst more sandy
coloured shades are preferred for desert camouflage. The garnish 16 is incised to
give it a more realistic 3D leafy effect.
[0025] A plurality of loops 18 are provided, extending outwardly from the edges of the net
2. These loops 18 may be used to attach the net 2 to the ground or other structure
as shown in Figs. 5 and 7 or they may be used to join two or more nets together.
[0026] As can best be seen in Fig. 8, a region of ventilation 20 is provided at the periphery
of the second net mesh 10. For clarity, the region of ventilation is indicated by
a dotted line. The region of ventilation 20 has a more open mesh dimension than the
bulk of the second net mesh 10 and provides a route for the convection of air. The
mesh is hexagonal and the dimension of the mesh is between the dimension of the first
net mesh 6 and the second net mesh10. The small mesh dimension of the second net mesh
10 tends to retain the heat. However, air is able to flow more freely through the
ventilation region 20. In an alternative embodiment, the ventilation region 20 could
be provided in the middle of the second net mesh 10 or at a plurality of locations
within the second net mesh 6.
[0027] In a further embodiment a collapsible chimney structure could be provided in the
second net mesh 10. The collapsible chimney structure would be in the form of a gap
in the second net mesh 10 defining a ventilation opening. In order to prevent the
ventilation opening snagging it could suitably be provided with a skirt of mesh material
depending downwardly from the perimeter of the ventilation opening. The skirt of mesh
material would preferably be made of the same material as the second net mesh 10 and
would preferably have a length at least equal to the diameter of the ventilation opening.
For example, if the ventilation was in the form of a circular opening with a diameter
of 50cm it would be preferable to have a skirt with a length of approximately 100cm.
This would help to reduce the snagging whilst preventing a build up of heat beneath
the net 2.
1. A net (2) comprising a first net mesh (6) having a first mesh dimension and a first
area and a second net mesh (10) having a second mesh dimension and a second area,
the second mesh dimension being smaller than the first mesh dimension, wherein the
first and second net meshes (6, 10) are attached at or near their respective perimeters,
characterized in that the second area is larger than the first area, so that when the first net mesh (6)
is held taut with the second net mesh (10) below it, the second net mesh (10) sags
below the first net mesh (6).
2. A net (2) according to claim 1, wherein the first net mesh (6) is provided with a
camouflage garnish (16).
3. A net (2) according to claim 1 or claim 2, wherein the first net mesh (6) is a square
mesh.
4. A net (2) according to any preceding claim, wherein the first net mesh (6) has a mesh
dimension of less than 75mm.
5. A net (2) according to claim 4, wherein the first net mesh (6) has a mesh dimension
in the range from about 10mm to about 40mm.
6. A net (2) according to claim 5, wherein the first net mesh (6) has a mesh dimension
in the range from about 15mm to about 25mm.
7. A net (2) according to any preceding claim, wherein the second net mesh (10) has a
mesh dimension in the range from about 1mm to about 10mm.
8. A net (2) according to any preceding claim, wherein the second net mesh (10) comprises
a ventilation region (20) having a more open mesh than the second mesh dimension.
9. A net (2) according to claim 8, wherein the ventilation region (20) is provided around
the periphery of the second net mesh (10).
10. A net (2) according to claim 8, wherein the ventilation region (20) is provided in
the centre of the second net mesh (10).
11. A net (2) according to any preceding claim, wherein the second net mesh (10) has a
ventilation opening.
12. A net (2) according to claim 11, wherein a skirt of mesh material is provided depending
downwardly from the ventilation opening.
13. A net (2) according to claim 12, wherein the length of the skirt is longer than the
diameter of the ventilation opening.
1. Filet (2) comportant une première maille de filet (6) ayant une première dimension
de maille et une première aire, et une seconde maille de filet (10) ayant une seconde
dimension de maille et une seconde aire, la seconde dimension de maille étant plus
petite que la première dimension de maille, dans lequel les première et seconde mailles
de filet (6, 10) sont fixées au niveau de leurs périmètres respectifs, ou à proximité
de ceux-ci, caractérisé en ce que la seconde aire est plus grande que la première aire, de sorte que lorsque la première
maille de filet (6) est maintenue serrée avec la seconde maille de filet (10) en dessous
de celle-ci, la seconde maille de filet (10) s'affaisse en dessous de la première
maille de filet (6).
2. Filet (2) selon la revendication 1, dans lequel la première maille de filet (6) est
munie d'une garniture de camouflage (16).
3. Filet (2) selon la revendication 1 ou 2, dans lequel la première maille de filet (6)
est une maille carrée.
4. Filet (2) selon l'une quelconque des revendications précédentes, dans lequel la première
maille de filet (6) a une dimension de maille inférieure à 75 mm.
5. Filet (2) selon la revendication 4, dans lequel la première maille de filet (6) a
une dimension de maille dans la plage d'environ 10 mm à environ 40 mm.
6. Filet (2) selon la revendication 5, dans lequel la première maille de filet (6) a
une dimension de maille dans la plage d'environ 15 mm à environ 25 mm.
7. Filet (2) selon l'une quelconque des revendications précédentes, dans lequel la seconde
maille de filet (10) a une dimension de maille dans la plage d'environ 1 mm à environ
10 mm.
8. Filet (2) selon l'une quelconque des revendications précédentes, dans lequel la seconde
maille de filet (10) comporte une zone de ventilation (20) ayant une maille plus ouverte
que la seconde dimension de maille.
9. Filet (2) selon la revendication 8, dans lequel la zone de ventilation (20) est agencée
autour de la périphérie de la seconde maille de filet (10).
10. Filet (2) selon la revendication 8, dans lequel la zone de ventilation (20) est agencée
au centre de la seconde maille de filet (10).
11. Filet (2) selon l'une quelconque des revendications précédentes, dans lequel la seconde
maille de filet (10) a une ouverture de ventilation.
12. Filet (2) selon la revendication 11, dans lequel une jupe du matériau de maille est
agencée suspendue vers le bas à partir de l'ouverture de ventilation.
13. Filet (2) selon la revendication 12, dans lequel la longueur de la jupe est plus longue
que le diamètre de l'ouverture de ventilation.
1. Netz (2) mit einem ersten Netzmaschengeflecht (6) mit einer ersten Maschenweite und
einem ersten Bereich und mit einem zweiten Netzmaschengeflecht (10) mit einer zweiten
Maschenweite und einem zweiten Bereich, wobei die zweite Maschenweite kleiner ist
als die erste Maschenweite, wobei das erste und das zweite Netzmaschengeflecht (6,
10) an oder nahe ihrem jeweiligen Rand befestigt sind, dadurch gekennzeichnet, dass der zweite Bereich größer ist als der erste Bereich, so dass das zweite Netzmaschengeflecht
(10) unter dem ersten Netzmaschengeflecht (6) durchhängt, wenn das erste Netzmaschengeflecht
(6) mit dem zweiten Netzmaschengeflecht (10) darunter straff gespannt gehalten wird.
2. Netz (2) nach Anspruch 1, bei dem das erste Netzmaschengeflecht (6) mit einer Tarnverzierung
(16) versehen ist.
3. Netz (2) nach Anspruch 1 oder 2, bei dem das erste Netzmaschengeflecht (6) ein quadratisches
Maschengeflecht ist.
4. Netz (2) nach einem der vorhergehenden Ansprüche, bei dem das erste Netzmaschengeflecht
(6) eine Maschenweite von weniger als 75mm hat.
5. Netz (2) nach Anspruch 4, bei dem das erste Netzmaschengeflecht (6) eine Maschenweite
im Bereich von etwa 10mm bis etwa 40mm hat.
6. Netz (2) nach Anspruch 5, bei dem das erste Netzmaschengeflecht (6) eine Maschenweite
im Bereich von etwa 15mm bis etwa 25mm hat.
7. Netz (2) nach einem der vorhergehenden Ansprüche, bei dem das zweite Netzmaschengeflecht
(10) eine Maschenweite im Bereich von etwa 1mm bis etwa 10mm hat.
8. Netz (2) nach einem der vorhergehenden Ansprüche, bei dem das zweite Netzmaschengeflecht
(10) einen Lüftungsbereich (20) aufweist, der ein offeneres Maschengeflecht hat als
die zweite Maschenweite.
9. Netz (2) nach Anspruch 8, bei dem der Lüftungsbereich (20) um den Rand des zweiten
Netzmaschengeflechts (10) herum vorgesehen ist.
10. Netz (2) nach Anspruch 8, bei dem der Lüftungsbereich (20) in der Mitte des zweiten
Netzmaschengeflechts (10) vorgesehen ist.
11. Netz (2) nach einem der vorhergehenden Ansprüche, bei dem das zweite Netzmaschengeflecht
(10) eine Lüftungsöffnung aufweist.
12. Netz (2) nach Anspruch 11, bei dem eine Schürze aus einem Material aus Maschengeflecht
vorgesehen ist, die von der Lüftungsöffnung nach unten hängt.
13. Netz (2) nach Anspruch 12, bei dem die Länge der Schürze größer ist als der Durchmesser
der Lüftungsöffnung.