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EP 2 185 771 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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02.04.2014 Bulletin 2014/14 |
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Date of filing: 05.09.2007 |
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International Patent Classification (IPC):
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International application number: |
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PCT/NL2007/000216 |
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International publication number: |
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WO 2009/031882 (12.03.2009 Gazette 2009/11) |
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REVETMENT FOR AN EMBANKMENT, AS WELL AS REVETMENT ELEMENT THEREFORE
BEFESTIGUNG FÜR EINEN DAMM SOWIE BEFESTIGUNGSELEMENT DAFÜR
REVÊTEMENT POUR UNE DIGUE ET ÉLÉMENT DE REVÊTEMENT ASSOCIÉ
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Designated Contracting States: |
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AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO
SE SI SK TR |
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Date of publication of application: |
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19.05.2010 Bulletin 2010/20 |
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Proprietor: Heijmans Wegen B.V. |
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5248 JT Rosmalen (NL) |
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Inventors: |
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- BOLK, Henricus, Johannes, Nicolaas, Antonius
NL-5248 JR Rosmalen (NL)
- VAN DER HORST, Willem
NL-1031 LG Amsterdam (NL)
- RAJA, Mahhob, Hassan
Warwickshire CV47 2SJ (GB)
- VAN VEEN, Dirk
NL-4794 RD Heijningen (NL)
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Representative: Nederlandsch Octrooibureau |
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P.O. Box 29720 2502 LS The Hague 2502 LS The Hague (NL) |
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References cited: :
WO-A-97/43487 DE-U1- 8 013 431
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DE-A1- 3 426 098 US-A- 4 128 357
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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).
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[0001] The invention is related to a revetment for an embankment, bank and the like, according
to the preamble of claim 1.
[0002] A revetment of this type is disclosed in
WO-A-97/43487. Said prior art revetment has revetment elements the line of symmetry of which is
generally oriented in the longitudinal direction of the rows. The convexly respectively
concavely shaped ends of said revetment elements offer the possibility to arrange
the revetment elements according to curved patterns. Thereby, the contour of specific
forms, such as of dikes, banks and the like can be followed. The openings which are
left free make the revetment less vulnerable with respect to water pressure from the
backside of the revetment. According to said prior art document, the revetment elements
are all oriented similarly in the longitudinal direction, which offers only limited
possibilities for arranging the revetment elements.
[0003] A further revetment of this type is disclosed in
FR-A-2.657.638. Said prior art revetment comprises modular construction elements or revetment elements
the circumference of which is formed by circular forms. One end of each revetment
element has a convex circular shape, whereas the opposite end has a concave circular
shape. The sides of the elements have mixed concave/convex circular shapes. This specific
layout with circular shapes provides the possibility to arrange the elements next
to each other, whereby a completely closed covering can be obtained. Such revetment
is less fit for protecting dikes, banks and the like, as the water pressure at the
back of the revetment cannot escape and thus poses the risk of destroying the revetment.
[0004] The object of the invention is therefore to provide an improved revetment which can
be applied in a more flexible way and which is suitable for applications wherein an
embankment is saturated with water. This object is achieved by the revetment having
the features of claim 1.
[0005] In the revetment according to the invention, the longitudinal direction or direction
of the line of symmetry of the revetment elements is not coincident with the longitudinal
direction of the row in question, but transverse with respect to said longitudinal
row direction. This offers specific advantages, which make it possible to adapt the
revetment better to the form of the dike, bank or the like to be covered. For instance,
the revetment elements may all be arranged in the same way with respect to their longitudinal
direction or line of symmetry, according to which they are pointing in the same direction
with their asymmetric part.
[0006] However, preference is given to the layout according to which the orientation of
revetment elements of a row with respect to their respective line of asymmetry is
opposite the orientation of revetment elements of a neighbouring row with respect
to their respective line of asymmetry. Thus, the revetment elements of neighbouring
rows are pointing in opposite directions, that is towards each other or away from
each other, with their asymmetric part.
[0007] The asymmetric form of the revetment elements can be obtained in many different ways.
According to one of the possible embodiment, the revetment elements may have a generally
triangular shape. Alternatively or additionally, the revetment elements may have a
general T-shape.
[0008] The revetment elements have a longitudinal section and a lateral section. According
to a preferred embodiment, said lateral section is positioned symmetric with respect
to the line of symmetry of the revetment elements. It is then quite well possible
to obtain orderly rows with oppositely oriented revetment elements in neighbouring
rows. In particular, the lateral sections of neighbouring rows may protrude between
each other in case the rows are shifted in longitudinal direction with respect to
each other over half the longitudinal length of the revetment element.
[0009] Conversely, the longitudinal section has a longitudinal side located opposite the
lateral section, said longitudinal sides of the revetment elements of neighbouring
series facing each other and/or contacting each other. In this connection, a further
refinement can be obtained in case the lateral section is symmetric with respect to
the line of symmetry of the revetment elements.
[0010] For the purpose of obtaining open spaces, and also for allowing the revetment elements
to be laid according to slight curves, the longitudinal section may have opposite
ends in longitudinal direction which are convexly shaped. Additionally, the longitudinal
section may have a concavely shaped longitudinal side located opposite the lateral
section. The lateral section has a convexly shaped lateral end. The lateral section
has opposite sides, when seen in longitudinal direction, which are concavely shaped.
[0011] These convex and concave shapes provide the revetment with openings which are desirable
for preventing the build up of water pressure behind the revetment. In this connection,
preferably the concavely shaped opposite sides of the lateral section have a radius
of curvature which is smaller than the radius of curvature of the concavely shaped
longitudinal side of the longitudinal section. Furthermore, each convexly shaped end
of the longitudinal section may merge into a concavely shaped side of the lateral
section.
[0012] As a result of the general T-shape of the revetment elements described before, the
rows may be arranged with respect to each other in such a way that the lateral end
of a revetment element of a series abuts the longitudinal sections of adjoining revetment
elements of a neighbouring series.
[0013] As already mentioned before, the rows which form the rows may be laid according to
several forms. According to a first possibility, the rows are rectilinear. Alternatively
or additionally, the rows are curved according to a part of a circle.
[0014] The invention will now be described further with reference to examples of the revetment
and of the revetment element used for the revetment as shown in the drawings.
Figure 1 shows a top view of the revetment consisting of rectilinear rows of revetment
elements.
Figure 2 shows a top view of the revetment consisting of slightly curved rows of revetment
elements.
Figure 3 shows a view in perspective of the revetment element used for the revetment
used for the revetment according to the invention.
[0015] The revetment shown in figure 1 consists of revetment elements 1 which are arranged
according to rows 2 and rows 3. It will be noted that the revetment elements 1 of
the rows 2 are oriented all in the same direction, whereas the revetment elements
1 of the other rows 3 are all oriented in the opposite direction with respect to the
orientation of the revetment elements 1 in rows 2. As shown in figure 3, each revetment
element 1 comprises a top face 4, a bottom face 5 and a circumference 6 which stretches
all around the revetment element 1 and which extends between the top face 4 and the
bottom face 5. Generally speaking, said top face 4 and said the bottom face 5 are
oriented parallel. The revetment elements 1 comprise a longitudinally extending section
7 as well as a transversely extending section 8. Both said longitudinally extending
section 7 and said transversely extending section 8 are symmetrical with respect to
the line of symmetry 9 as shown in figure 3. Furthermore, the revetment element 1
has a line of asymmetry 10 which line is shown in figure 1 as well.
[0016] The revetment element 1 in question has a general T-shape which is formed by said
longitudinal section 7 and the transverse section 8. Said longitudinal section 7 has
opposite ends 11,12 in longitudinal direction which are convexly shaped. Furthermore,
the longitudinal section 7 has a longitudinal side 13 opposite the lateral section
8, which longitudinal side 13 has a concave shape. Conversely, the lateral section
8 has a convexly shaped lateral end 14. Moreover, the lateral section 8 has sides
15, 16 which are located opposite each other when seen in longitudinal direction,
which sides have a concave shape. The convexly shaped end 14 of the lateral section
8 merges smoothly into said concavely shaped sides 15, 16. Furthermore, said concavely
shaped sides 15, 16 merge into the corresponding convexly shaped ends 11, 12 via the
respective transitions 17, 18.
[0017] Now turning to the rectilinear embodiment as shown in figure 1, it is clear that
the neighbouring rows 2 respectively 3 are shifted with respect to each other in the
longitudinal direction, over a distance which is about equal to half the longitudinal
dimension of the longitudinal section 7. Furthermore, the convexly shaped ends 11,
12 of the longitudinal sections 7 abut each other. Also, the convexly shaped ends
14 of the lateral sections 8 abut onto the longitudinal sections 7 of the revetment
elements of a neighbouring row, about at the location of the transitions 17, 18 of
the concavely shaped sides 15, 16 and the convexly shaped ends 11, 12 of the neighbouring
revetment elements of a neighbouring row.
[0018] As a result of the convex and concave shapes of the revetment elements 1, open spaces
19, 20 are formed between said revetment elements 1 which a beneficial for allowing
water to pass through for the purposes of preventing the development of water pressure
behind the revetment in question.
[0019] In the embodiment of figure 1, according to which the rows 2 are arranged rectilinearly,
all elements of neighbouring rows are shifted with respect to each other over about
half the length of the longitudinal section 7. This is different in the embodiment
shown in figure 2, according to which embodiment the rows 2, 3 are arranged according
to a circle with large radius of curvature, e.g. of 100 metres. Here, the pairs of
neighbouring rows 2, 3 which are characterised by the longitudinal sections 8 thereof
which are pointing towards each other, are indeed arranged in such a way that the
revetment elements thereof are shifted over half the length of the longitudinal section
7. However, pairs of neighbouring rows 2, 3 which are characterised by their longitudinal
sides 13 lying against each other, have revetment elements 1 which are shifted with
respect to each other over a distance which is different from half the length of the
longitudinal section 7. This difference is caused by the curvature of the rows.
[0020] Nevertheless, also in this arrangement open spaces 19,20 are formed, and also open
spaces 21 between pairs of abutting longitudinal sides 13.
1. Revetment for an embankment, bank and the like, comprising revetment elements (1)
which have parallel bottom (5) and top (4) surfaces and which are arranged according
to rows (2, 3) which are positioned next to each other in transverse direction, said
rows (2, 3) each extending in longitudinal direction, each revetment (1) element being
symmetric with respect to a line of symmetry (9) and asymmetric with respect to a
line of asymmetry (10) which is perpendicular with respect to the line of symmetry
(9), open spaces (19-21) being enclosed between subsequent revetment elements (1)
of a row (2, 3) and between revetment elements (1) of neighbouring rows (2, 3) the
lines of symmetry (9) of the revetment elements (1) are oriented in the transverse
direction, and the revetment elements (1) which are arranged according to a single
row (2, 3) have the same orientations with respect to their respective line of asymmetry
(10), characterised in that the revetment elements (1) have a longitudinal section (7) and a lateral section
(8), and in that the lateral section (8) has sides (15, 16) located opposite each other when seen
in longitudinal direction, which sides (15, 16) are concavely shaped, and in that the longitudinal sections (7) have convexly shaped opposite ends (11, 12) which abut
an opposite end of a neighbouring element.
2. Revetment according to claim 1, wherein the orientation of revetment elements (1)
of a row (2, 3) with respect to their respective line of asymmetry (10) is opposite
the orientation of revetment elements (1) of a neighbouring row (2, 3) with respect
to their respective line of asymmetry (10).
3. Revetment according to claim 1 or 2, wherein the lines of symmetry (9) of the revetment
elements (1) are oriented perpendicularly with respect to the longitudinal direction.
4. Revetment according to any of the preceding claims, wherein the revetment elements
(1) have a generally triangular shape.
5. Revetment according to any of the preceding claims, wherein the revetment elements
(1) have a general T-shape.
6. Revetment according to any of the preceding claims, wherein the lateral section (8)
is positioned symmetric with respect to the line of symmetry (9) of the revetment
elements (1).
7. Revetment according to any of the preceding claims, wherein the lateral section (8)
is symmetric with respect to the line of symmetry (9) of the revetment elements (1).
8. Revetment according to any of the preceding claims, wherein the longitudinal section
(7) has opposite ends (11, 12) in longitudinal direction which are convexly shaped.
9. Revetment according to any of the preceding claims, wherein the longitudinal section
(7) has a longitudinal side (13) located opposite the lateral section (8), said longitudinal
sides (13) of the revetment elements (1) of neighbouring series facing each other
and/or contacting each other.
10. Revetment according to claim 9, wherein the longitudinal side (13) of the longitudinal
section (7) is concavely shaped.
11. Revetment according to any of the preceding claims claims, wherein the lateral section
(8) has a convexly shaped lateral end (14).
12. Revetment according to claims 10 or 11, wherein the concavely shaped opposite sides
(15, 16) of the lateral section (8) have a radius of curvature which is smaller than
the radius of curvature of the concavely shaped longitudinal side (13) of the longitudinal
section (7).
13. Revetment according claims 8, wherein each convexly shaped end (11, 12) of the longitudinal
section (7) merges into a concavely shaped side (15, 16) of the lateral section (8).
14. Revetment according to any of the preceding claims, wherein neighbouring rows (2,
3) are shifted with respect to each other in the longitudinal direction over a distance
smaller than the longitudinal dimension of a revetment element (1).
15. Revetment according to any of the preceding claims, wherein neighbouring rows (2,
3) are shifted with respect to each other in the longitudinal direction over a distance
equal to half the longitudinal dimension of a revetment element (1).
16. Revetment according to claim 14 or 15, wherein the lateral end (14) of a revetment
element (1) of a series abuts the longitudinal sections (7) of adjoining revetment
elements (1) of neighbouring rows.
17. Revetment according to claim 16, wherein the lateral ends (14) of the revetment elements
(1) of neighbouring rows (2, 3) enclose open spaces (19).
18. Revetment according to any of the preceding claims, wherein the rows (2, 3) are rectilinear.
19. Revetment according to any of claims 1-17, wherein the rows (2, 3) are curved according
to a part of a circle.
1. Befestigung für einen Damm, eine Böschung und dergleichen, umfassend Befestigungselemente
(1), die parallele Boden (5)- und Oberseiten (4)-Oberflächen haben und die in Reihen
(2, 3) angeordnet sind, die in Querrichtung nebeneinander positioniert sind, wobei
sich die Reihen (2, 3) jeweils in Längsrichtung erstrecken, jedes Befestigungselement
(1) symmetrisch bezüglich einer Symmetrielinie (9) und asymmetrisch bezüglich einer
Asymmetrielinie (10), die senkrecht in Bezug auf die Symmetrielinie (9) ist, ist;
offene Räume (19-21) zwischen nachfolgenden Befestigungselementen (1) einer Reihe
(2, 3) und zwischen Befestigungselementen (1) benachbarter Reihen (2, 3) eingeschlossen
sind; die Symmetrielinie (9) der Befestigungselemente (1) in der Querrichtung orientiert
sind und die Befestigungselemente (1), die in einer einzelnen Reihe (2, 3) angeordnet
sind, dieselben Orientierungen bezüglich ihrer entsprechenden Asymmetrielinie (10)
haben, dadurch gekennzeichnet, dass die Befestigungselemente (1) einen Längsteil (7) und einen Seitenteil (8) haben und
dass der Seitenteil (8) Seiten (15, 16) hat, die einander gegenüber angeordnet sind,
wenn in Längsrichtung gesehen wird, wobei die Seiten (15, 16) konkav geformt sind,
und dass die Längsteile (7) konvex geformte gegenüberliegende Enden (11, 12) haben,
die an einem gegenüberliegenden Ende eines benachbarten Elements anstoßen.
2. Befestigung gemäß Anspruch 1, wobei die Orientierung von Befestigungselementen (1)
einer Reihe (2, 3) bezüglich ihrer entsprechenden Asymmetrielinie (10) der Orientierung
von Befestigungselementen (1) einer benachbarten Reihe (2, 3) bezüglich ihrer entsprechenden
Asymmetrielinie (10) entgegengesetzt ist.
3. Befestigung gemäß Anspruch 1 oder 2, wobei die Symmetrielinien (9) der Befestigungselemente
(1) bezüglich der Längsrichtung senkrecht orientiert sind.
4. Befestigung gemäß einem der vorangehenden Ansprüche, wobei die Befestigungselemente
(1) eine im Allgemeinen dreieckige Form haben.
5. Befestigung gemäß einem der vorangehenden Ansprüche, wobei die Befestigungselemente
(1) eine allgemeine T-Form haben.
6. Befestigung gemäß einem der vorangehenden Ansprüche, wobei der Seitenteil (8) symmetrisch
bezüglich der Symmetrielinie (9) der Befestigungselemente (1) positioniert ist.
7. Befestigung gemäß einem der vorangehenden Ansprüche, wobei der Seitenteil (8) bezüglich
der Symmetrielinie (9) der Befestigungselemente (1) symmetrisch ist.
8. Befestigung gemäß einem der vorangehenden Ansprüche, wobei der Längsteil (7) gegenüberliegende
Enden (11, 12) in Längsrichtung hat, die konvex geformt sind.
9. Befestigung gemäß einem der vorangehenden Ansprüche, wobei der Längsteil (7) eine
Längsseite (13), die gegenüber dem Seitenteil (8) lokalisiert ist, hat, wobei die
Längsseiten (13) der Befestigungselemente (11) benachbarter Reihen einander gegenüberliegen
und/oder einander berühren.
10. Befestigung gemäß Anspruch 9, wobei die Längsseite (13) des Längsteils (7) konkav
geformt ist.
11. Befestigung gemäß einem der vorangehenden Ansprüche, wobei der Seitenteil (8) ein
konvex geformtes seitliches Ende (14) hat.
12. Befestigung gemäß Anspruch 10 oder 11, wobei die konkav geformten gegenüberliegenden
Seiten (15, 16) des Seitenteils (8) einen Krümmungsradius haben, der kleiner ist als
der Krümmungsradius der konkav geformten Längsseite (13) des Längsteils (7).
13. Befestigung gemäß Anspruch 8, bei der jedes konvex geformte Ende (11, 12) des Längsteils
(7) in eine konkav geformte Seite (15, 16) des Seitenteils (8) übergeht.
14. Befestigung gemäß einem der vorangehenden Ansprüche, wobei benachbarte Reihen (2,
3) zueinander in Längsrichtung über eine Distanz, die kleiner ist als die Längsabmessung
eines Befestigungselements (1) verschoben sind.
15. Befestigung gemäß einem der vorangehenden Ansprüche, wobei benachbarte Reihen (2,
3) zueinander in Längsrichtung über eine Distanz, die gleich der Hälfte der Längsabmessung
eines Befestigungselements (1) ist, verschoben sind.
16. Befestigung gemäß Anspruch 14 oder 15, wobei das seitliche Ende (14) eines Befestigungselements
(1) einer Reihe an die Längsteile (7) von angrenzenden Befestigungselementen (1) benachbarter
Reihen anstößt.
17. Befestigung gemäß Anspruch 16, wobei die seitlichen Enden (14) der Befestigungselemente
(1) benachbarter Reihen (2, 3) offene Räume (19) einschließen.
18. Befestigung gemäß einem der vorangehenden Ansprüche, wobei die Reihen (2, 3) geradlinig
sind.
19. Befestigung gemäß einem der Ansprüche 1 bis 17, wobei die Reihen (2, 3) entsprechend
einem Teil eines Kreises gebogen sind.
1. Revêtement pour une digue, un talus et similaire, comprenant des éléments de revêtement
(1) qui ont des surfaces inférieure (5) et supérieure (4) parallèles et qui sont agencés
selon des rangées (2, 3) qui sont positionnées les unes à côté des autres dans la
direction transversale, lesdites rangées (2, 3) s'étendant chacune dans la direction
longitudinale, chaque élément de revêtement (1) étant symétrique par rapport à une
ligne de symétrie (9) et asymétrique par rapport à une ligne d'asymétrie (10) qui
est perpendiculaire par rapport à la ligne de symétrie (9), des espaces ouverts (19-21)
étant enfermés entre des éléments de revêtement (1) successifs d'une rangée (2, 3)
et entre des éléments de revêtement (1) de rangées de voisines (2, 3), dans lequel
les lignes de symétrie (9) des éléments de revêtement (1) sont orientées dans la direction
transversale, et les éléments de revêtement (1) qui sont agencés selon une seule rangée
(2, 3) ont les mêmes orientations par rapport à leur ligne d'asymétrie (10) respective,
caractérisé en ce que les éléments de revêtement (1) ont une section longitudinale (7) et une section latérale
(8), et en ce que la section latérale (8) a des côtés (15, 16) opposés les uns aux autres, lorsqu'ils
sont observés dans la direction longitudinale, lesquels côtés (15, 16) sont formés
de manière concave, et en ce que les sections longitudinales (7) ont des extrémités opposées (11, 12) formées de manière
convexe, qui viennent en butée contre une extrémité opposée d'un élément voisin.
2. Revêtement selon la revendication 1, dans lequel l'orientation des éléments de revêtement
(1) d'une rangée (2, 3) par rapport à leur ligne d'asymétrie (10) respective est opposée
à l'orientation des éléments de revêtement (1) d'une rangée voisine (2, 3) par rapport
à leur ligne d'asymétrie (10) respective.
3. Revêtement selon la revendication 1 ou 2, dans lequel les lignes de symétrie (9) des
éléments de revêtement (1) sont orientées de manière perpendiculaire par rapport à
la direction longitudinale.
4. Revêtement selon l'une quelconque des revendications précédentes, dans lequel les
éléments de revêtement (1) ont une forme généralement triangulaire.
5. Revêtement selon l'une quelconque des revendications précédentes, dans lequel les
éléments de revêtement (1) ont une forme générale en T.
6. Revêtement selon l'une quelconque des revendications précédentes, dans lequel la section
latérale (8) est positionnée symétriquement par rapport à la ligne de symétrie (9)
des éléments de revêtement (1).
7. Revêtement selon l'une quelconque des revendications précédentes, dans lequel la section
latérale (8) est symétrique par rapport à la ligne de symétrie (9) des éléments de
revêtement (1).
8. Revêtement selon l'une quelconque des revendications précédentes, dans lequel la section
longitudinale (7) a des extrémités (11, 12) opposées dans la direction longitudinale
qui sont formées de manière convexe.
9. Revêtement selon l'une quelconque des revendications précédentes, dans lequel la section
longitudinale (7) a un côté longitudinal (13) positionné de manière opposée à la section
latérale (8), lesdits côtés longitudinaux (13) des éléments de revêtement (1) des
séries voisines se faisant face et/ou étant en contact les uns par rapport aux autres.
10. Revêtement selon la revendication 9, dans lequel le côté longitudinal (13) de la section
longitudinale (7) est formé de manière concave.
11. Revêtement selon l'une quelconque des revendications précédentes, dans lequel la section
latérale (8) a une extrémité latérale (14) de forme convexe.
12. Revêtement selon les revendications 10 ou 11, dans lequel les côtés opposés (15, 16)
de forme concave de la section latérale (8) ont un rayon de courbure qui est inférieur
au rayon de courbure du côté longitudinal (13) de forme concave de la section longitudinale
(7).
13. Revêtement selon la revendication 8, dans lequel chaque extrémité (11, 12) de forme
convexe de la section longitudinale (7) se fond dans un côté (15, 16) de forme concave
de la section latérale (8).
14. Revêtement selon l'une quelconque des revendications précédentes, dans lequel les
rangées voisines (2, 3) sont décalées les unes par rapport aux autres dans la direction
longitudinale sur une distance inférieure à la dimension longitudinale d'un élément
de revêtement (1).
15. Revêtement selon l'une quelconque des revendications précédentes, dans lequel les
rangées voisines (2, 3) sont décalées les unes par rapport aux autres dans la direction
longitudinale sur une distance égale à la moitié de la dimension longitudinale d'un
élément de revêtement (1).
16. Revêtement selon la revendication 14 ou 15, dans lequel l'extrémité latérale (14)
d'un élément de revêtement (1) d'une série vient en butée contre les sections longitudinales
(7) des éléments de revêtement (1) attenants des rangées voisines.
17. Revêtement selon la revendication 16, dans lequel les extrémités latérales (14) des
éléments de revêtement (1) des rangées voisines (2, 3) enferment des espaces ouverts
(19).
18. Revêtement selon l'une quelconque des revendications précédentes, dans lequel les
rangées (2, 3) sont rectilignes.
19. Revêtement selon l'une quelconque des revendications 1 à 17, dans lequel les rangées
(2, 3) sont incurvées selon une partie d'un cercle.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only.
It does not form part of the European patent document. Even though great care has
been taken in compiling the references, errors or omissions cannot be excluded and
the EPO disclaims all liability in this regard.
Patent documents cited in the description