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(11) | EP 2 268 525 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
CABLE TRANSPORTATION SYSTEM KABELTRANSPORTSYSTEM SYSTÈME DE TRANSPORT PAR CÂBLE |
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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). |
TECHNICAL FIELD
[0002] More specifically, the present invention relates to a cable transportation system of the type comprising a draw cable; at least one supporting cable; a transportation unit comprising a trolley supported by the supporting cable and connected to the draw cable by a clamp; and at least one fixed idler comprising a succession of rollers distributed along a first trajectory to support and guide the draw cable, and a fixed shoe for supporting and guiding the supporting cable along a second trajectory extending along the first trajectory; the first and second trajectory, when projected in a horizontal plane, respectively defining a first and second path having a first curved intermediate portion and a second curved intermediate portion respectively.
BACKGROUND ART
[0003] In known cable transportation systems, see for example GB-A-27,151, the supporting cable is located over the draw cable, and the clamp is fitted to an arm, which extends downwards from the trolley and is designed so that, when the trolley runs along the idler, the draw cable is detached from the idler rollers along a suspension portion, of which a central part is located at the clamp, and two straight lateral parts extend from the clamp towards the rollers.
[0004] In known cable transportation systems, the idler rollers are cylindrical, and each have a circumferential groove to guide the draw cable, and is fitted to a fixed carrier to rotate idly about a respective normally horizontal axis.
[0005] In known cable transportation systems of the above type - i.e. in which the idler rollers are distributed in space along a first trajectory, the horizontal projection of which extends along a first path having a first curved intermediate portion, and the shoe guides the supporting cable along a second trajectory, the horizontal projection of which extends along a second path having a second curved intermediate portion - the first and second path are normally parallel, i.e. are the same shape.
[0006] Such a solution has potential drawbacks, in that, as the trolley runs along the curved intermediate portion of the second path, the clamp runs along the curved intermediate portion of the first path, and each straight lateral part of the suspension portion of the draw cable is located along a chord connected to the curved intermediate portion of the first path by a given angle of other than 180°.
[0007] This invariably results in wear of both the idler rollers and the draw cable, and may even result in jamming and/or unseating of the draw cable.
DISCLOSURE OF INVENTION
[0008] It is an object of the present invention to provide a cable transportation system of the above type, designed to eliminate the aforementioned drawbacks.
[0009] According to the present invention, there is provided a cable transportation system comprising a draw cable; at least one supporting cable; a transportation unit comprising a trolley supported by the supporting cable and selectively connectable to the draw cable by a clamp; and at least one fixed idler comprising a succession of rollers distributed along a first trajectory to support and guide the draw cable, and a fixed shoe for supporting and guiding the supporting cable along a second trajectory extending along the first trajectory; the first and second trajectory, when projectect in a horizontal plane, respectively defining a first and second path having a first curved intermediate portion and a second curved intermediate portion respectively; wherein, along the idler and when the trolley is located, in use, along the idler, the draw cable comprises a suspension portion detached from the rollers, and of which a central part is located at the clamp, and two straight end parts extend from the clamp towards the rollers; the cable transportation system being characterized in that the first curved portion extending along an envelope curve of the horizontal projections of said straight end parts in the successive positions occupied by the straight end parts as the trolley moves, in use, along the second curved portion.
[0010] To assist detachment of the upstream end part of the suspension portion from the rollers, and reconnection of the downstream end part of the suspension portion to the rollers as the trolley runs along the second curved intermediate portion, the rollers along the first curved intermediate portion are preferably inclined rollers mounted to rotate about respective axes, which are inclined so that a top peripheral portion, engaged by the draw cable, of each inclined roller faces outwards with respect to the second curved intermediate portion.
[0011] Finally, each inclined roller preferably has an outer surface defined by two opposite truncated-cone-shaped surfaces defining a V-section annular groove.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] A non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
Figure 1 shows a schematic side view, with parts removed for clarity, of a preferred embodiment of the transportation system according to the present invention;
Figure 2 shows a larger-scale view in perspective of a detail in Figure 1;
Figure 3 shows a side view of the Figure 2 detail;
Figure 4 shows a larger-scale detail of Figure 3;
Figure 5 shows a plan view of the Figure 2 detail;
Figure 6 shows a larger-scale section along line VI-VI in Figure 5;
Figure 7 shows a larger-scale section along line VII-VII in Figure 4;
Figure 8 shows a larger-scale section along line VIII-VIII in Figure 3;
Figure 9 shows a larger-scale schematic, with parts removed for clarity, of a detail in Figure 8.
BEST MODE FOR CARRYING OUT THE INVENTION
[0013] Number 1 in Figure 1 indicates as a whole a cable transportation system comprising a bottom station 2; a top station 3; two intermediate idlers 4 supported by respective pylons 5; two supporting cables 6 (only one shown in Figure 1); a draw cable 7; and a transportation unit 8 comprising a trolley 9, which is supported by supporting cables 6, and is drawn, in use, by draw cable 7, to which trolley 9 is connected by a clamp 10.
[0014] More specifically, supporting cables 6 are parallel, and draw cable 7 extends below supporting cables 6 and is so positioned that, along substantially the whole of cable transportation system 1 and at any point in its operation, connecting the corresponding points of supporting cables 6 and draw cable 7 gives a substantially isosceles triangle with a horizontal base at the top and a downward-facing apex defined by a point on draw cable 7.
[0015] As shown more clearly in Figures 2 and 4, trolley 9 comprises a longitudinal frame 11 with two cross members 12, each of which extends crosswise to supporting cables 6 and supports at each end a wheel assembly 13 comprising a rocker arm 14, which is connected to relative cross member 12 to oscillate about an axis 15 crosswise to supporting cables 6, and supports, at each end, an idle roller 16, the periphery of which rolls in contact with relative supporting cable 6. An L-shaped arm 17 projects downwards from frame 11, and the end portion of the arm is located below and connected to draw cable 7 by clamp 10, which is selectively releasable in known manner to release trolley 9 from draw cable 7.
[0016] A further arm 18 projects laterally from longitudinal frame 11, bends downwards and outwards of supporting cables 6, and supports in rocking manner a load forming part of transportation unit 8 and defined, in the example shown, by a car 19.
[0017] As shown in Figure 1, each idler 4 comprises a roller assembly 20 in turn comprising a succession of rollers 21, which are fitted idly to an elongated carrier 22 integral with relative pylon 5, and support and guide draw cable 7 in space through idler 4 and along a trajectory T1. Idler 4 also comprises an elongated shoe 23 integral with relative pylon 5, and which supports and guides supporting cables 6 along respective trajectories T2.
[0018] As shown more clearly in Figure 2, shoe 23 comprises two parallel, elongated lateral shoulders 24, each of which is vertical and bounded at the top by a transverse core supporting a respective rail 25, which has a longitudinal groove 26 extending along relative trajectory T2 and engaged by relative supporting cable 6. The two lateral shoulders 24 are connected to relative pylon 5 in known manner not shown, and are connected to each other by a number of transverse ribs 27. Each pair of adjacent ribs 27 defines, together with lateral shoulders 24, a window 28 engaged by a relative roller 21 of roller assembly 20. Each rib 27 is bounded at the bottom by a flat, substantially horizontal edge, and is bounded at the top by an upwardly-concave curved edge 29 having a central recess 30, which divides edge 29 into two sloping sides converging downwards towards recess 30, and the end portions of which, adjacent to recess 30, are fitted with respective converging pads 31 inclined as specified in detail below. The succession of recesses 30 defines a channel 32 extending substantially along trajectory T1, and from the bottom of which rollers 21 project partly upwards through relative windows 28.
[0019] As shown in Figure 3, when projected in a vertical plane, trajectories T1 and T2 (Fig. 2) define respective parallel, downwardly-concave, curved paths.
[0020] As shown in Figure 5, when projected in a horizontal plane, trajectories T1 and T2 define respective paths P1 and P2. More specifically, path P1 comprises a curved intermediate portion 33 interposed between a straight entry end portion 34 and a straight exit end portion 35; whereas paths P2 are parallel, and each comprise a curved intermediate portion 36 interposed between a straight entry end portion 37 parallel to end portion 34, and a straight exit end portion 38 parallel to end portion 35. Straight entry end portions 37 are generally symmetrical with respect to straight entry end portion 34; straight exit end portions 38 are generally symmetrical with respect to straight exit end portion 35; whereas curved intermediate portion 33 has a smaller curvature than curved intermediate portions 36, and gets gradually closer to the inner curved intermediate portion 36, eventually reaching a minimum distance from it at the centre of the inner curved intermediate portion 36.
[0021] This difference in the shape of curved intermediate portions 33 and 36 is due to the fact that, as trolley 9 runs along curved intermediate portions 36 of paths P2, its clamp 10 moves along a path parallel to curved intermediate portions 36 and, at the same time, lifts draw cable 7 off rollers 21 along a suspension portion 39 movable with trolley 9, and of which an intermediate part extends along clamp 10, and two end parts 40 extend along respective chords of the path travelled by clamp 10, and form angles of other than 180° with the portions of draw cable 7 adjacent to them. If the horizontal projections of end parts 40 for each position of trolley 9 along curved intermediate portions 36 are represented in a horizontal plane, this gives a so-called "envelope curve", the shape and position of which coincide with those of curved intermediate portion 33.
[0022] By arranging rollers 21 along a path P1 of the shape described above, the two end parts 40 are respectively detached from and reconnected to rollers 21, forming angles of substantially 180° with the respective adjacent portions of draw cable 7.
[0023] As shown more clearly in Figures 5 and 6, rollers 21 comprise cylindrical rollers 21a, which are arranged successively along straight portions 34 and 35 of path P1, each have an annular, substantially semicircular-section groove 41 engaged by draw cable 7, and are fitted to carrier 22 (Figure 1) to rotate idly about respective horizontal axes 42.
[0024] As shown more clearly in Figures 4, 5, 7 and 8, rollers 21 also comprise rollers 21b arranged successively along curved intermediate portion 33 of path P1, and fitted to carrier 22 (Figure 1) to rotate about respective axes 43 (Figures 7, 8), which are inclined to the horizontal by an angle of 5 to 45 degrees, so that a top peripheral portion, engaged by draw cable 7, of each roller 21b faces the outer curved intermediate portion 36, and has an outer surface (Figures 7, 8) defined by two opposite truncated-cone-shaped surfaces 44, 45 defining an annular, V-section groove 46. More specifically, at the highest point of truncated-cone-shaped surfaces 44 and 45, the relative generating lines are substantially parallel to and coplanar with the respective adjacent pads 31, and cooperate with pads 31 to completely close channel 32 at relative window 28.
[0025] As such, rollers 21b not only provide for guiding detachment and reconnection of end parts 40 from and to roller assemblies 20 along curved intermediate portion 33 of path P1, but also make jamming and/or unseating of draw cable 7 along curved intermediate portion 33 of path P1 substantially impossible.
1. A cable transportation system comprising a draw cable (7); at least one supporting
cable (6); a transportation unit (8) comprising a trolley (9) supported by the supporting
cable (6) and selectively connectable to the draw cable (7) by a clamp (10); and at
least one fixed idler (4) comprising a succession of rollers (21) distributed along
a first trajectory (T1) to support and guide the draw cable (7), and a fixed shoe
(23) for supporting and guiding the supporting cable (6) along a second trajectory
(T2) extending along the first trajectory (T1); the first and second trajectory (T1,
T2), when projected in a horizontal plane, respectively defining a first and second
path (P1, P2) comprising a first and second curved portion (33, 36) respectively;
wherein, along the idler (4) and when the trolley (9) is located, in use, along the
idler (4), the draw cable (7) comprises a suspension portion (39) detached from the
rollers (21), and of which a central part is located at the clamp (10), and two straight
end parts (40) extend from the clamp (10) towards the rollers (21); the cable transportation
system being characterized in that the first curved portion (33) is extending along an envelope curve of the horizontal
projections of said straight end parts (40) in the successive positions occupied by
the straight end parts (40) as the trolley (9) moves, in use, along the second curved
portion (36).
2. A cable transportation system as claimed in Claim 1, wherein the first and second
curved portion (33, 36) are intermediate portions of the first and second path (P1,
P2) respectively; and wherein the first path (P1) also comprises two straight first
end portions (34, 35) on opposite sides of the first curved portion (33); and the
second path (P2) also comprises two straight second end portions (37, 38) on opposite
sides of the second curved portion (36); each straight first end portion (34; 35)
being parallel to a respective straight second end portion (37; 38).
3. A cable transportation system as claimed in one of the foregoing Claims, wherein the
rollers (21) along the first curved portion (33) are inclined rollers (21b) mounted
to rotate about respective axes (43), which are inclined so that a top peripheral
portion, engaged by the draw cable (7), of each inclined roller (21b) faces outwards
with respect to the second curved portion (36).
4. A cable transportation system as claimed in Claim 3, wherein each said inclined roller
(21b) has an outer surface defined by two opposite truncated-cone-shaped surfaces
(44, 45) defining an annular, V-section groove (46).
5. A cable transportation system as claimed in Claim 3 or 4, wherein the axis (43) of
rotation of each inclined roller (21b) forms an angle of 5° to 45° with the horizontal.
6. A cable transportation system as claimed in any of the foregoing Claims, wherein the
rollers (21) along each straight first end portion (34; 35) are cylindrical rollers
(21a) mounted to rotate about respective horizontal axes (42).
7. A cable transportation system as claimed in one of the foregoing Claims, and comprising
two said supporting cables (6), and wherein the shoe (23) comprises two parallel,
elongated, longitudinal lateral shoulders (24), each of which supports supporting
and guide means (25, 26), extending along a respective second trajectory (T2), for
a respective supporting cable (6); and a number of transverse ribs (27) connecting
the two shoulders (24) to each other; each pair of adjacent ribs (27) defining, together
with the shoulders (24), a window (28) engaged by a relative roller (21) for supporting
and guiding the draw cable (7).
8. A cable transportation system as claimed in Claim 7, wherein each rib (27) is bounded
at the top by an upwardly-concave curved edge (29) having a central recess (30), which
divides the curved edge (29) into two sloping sides converging downwards towards the
recess (30); the recesses (30) being aligned to define a channel (32) extending along
the first trajectory (T1).
9. A cable transportation system as claimed in Claim B, wherein the end portions, adjacent
to the relative recess (30), of said sloping sides of each rib (27) are fitted with
respective inclined, converging pads (31).
10. An idler as described in claim 1 for a cable transportation system as claimed in any
one of the foregoing Claims.
1. Kabel- bzw. Seiltransportsystem, das umfasst: ein Zugseil (7); wenigstens ein Halteseil
(6); eine Transporteinheit (8), die einen Wagen (9) umfasst, der von dem Halteseil
(6) gehalten wird und durch eine Klemme (10) selektiv mit dem Zugseil (7) verbindbar
ist; und wenigstens eine feste Rollenbatterie (4), die eine Folge von Rollen (21)
umfasst, die entlang einer ersten Bewegungsbahn (T1) verteilt sind, um das Zugseil
(7) zu halten und zu führen, und einen festen Aufspannkörper (23) zum Halten und Führen
des Halteseils (6) entlang einer zweiten Bewegungsbahn (T2), die sich entlang der
ersten Bewegungsbahn (T1) erstreckt; wobei die erste und zweite Bewegungsbahn (T1,
T2), wenn sie in eine Horizontalebene projiziert werden, jeweils einen ersten und
zweiten Pfad (P1, P2) definieren, die jeweils einen ersten und zweiten gekrümmten
Abschnitt (33, 36) umfassen; wobei das Zugseil (7) entlang der Rollenbatterie (4)
und wenn der Wagen (9) im Gebrauch entlang der Rollenbatterie (4) angeordnet ist,
einen Aufhängungsabschnitt (39) umfasst, der von den Rollen (21) gelöst ist und von
dem ein zentraler Teil sich an der Klemme (10) befindet, und zwei gerade Endteile
(40) sich von der Klemme (10) in Richtung der Rollen (21) erstrecken; wobei das Seiltransportsystem
dadurch gekennzeichnet ist, dass der erste gekrümmte Abschnitt (33) sich entlang einer Einhüllendenkurve der horizontalen
Projektionen der geraden Endteile (40) in den aufeinanderfolgenden Abschnitten erstreckt,
die von den geraden Endteilen (40) besetzt sind, während der Wagen (9) sich im Gebrauch
entlang des gekrümmten Abschnitts (36) bewegt.
2. Seiltransportsystem nach Anspruch 1, wobei der erste und zweite gekrümmte Abschnitt
(33, 36) jeweils Zwischenabschnitte des ersten und zweiten Pfads (P1, P2) sind; und
wobei der erste Pfad (P1) auch zwei gerade erste Endabschnitte (34, 35) auf entgegengesetzten
Seiten des ersten gekrümmten Abschnitts (33) umfasst; und der zweite Pfad (P2) auch
zwei gerade zweite Endabschnitte (37, 38) auf entgegengesetzten Seiten des zweiten
gekrümmten Abschnitts (36) umfasst; wobei jeder gerade erste Endabschnitt (34; 35)
parallel zu einem jeweiligen geraden zweiten Endabschnitt (37; 38) ist.
3. Seiltransportsystem nach einem der vorangehenden Ansprüche, wobei die Rollen (21)
entlang des ersten gekrümmten Abschnitts (33) Schrägrollen (21 b) sind, die derart
montiert sind, dass sie sich um jeweilige Achsen (43) drehen, die derart geneigt sind,
dass ein oberer Umfangsabschnitt, in den von dem Zugseil (7) eingegriffen wird, jeder
Schrägrolle (21 b) in Bezug auf den zweiten gekrümmten Abschnitt (36) nach außen gewandt
ist.
4. Seiltransportsystem nach Anspruch 3, wobei jede Schrägrolle (21 b) eine Außenoberfläche
hat, die durch zwei entgegengesetzte kegelstumpfförmige Oberflächen (44, 45) definiert
wird, die eine ringförmige Nut (46) mit V-Schnitt bilden.
5. Seiltransportsystem nach Anspruch 3 oder 4, wobei die Drehachse (43) jeder Schrägrolle
(21 b) einen Winkel von 5° bis 45° mit der Horizontalen bildet.
6. Seiltransportsystem nach einem der vorangehenden Ansprüche, wobei die Rollen (21)
entlang jedem geraden ersten Endabschnitt (34; 35) Zylinderrollen (21 a) sind, die
derart montiert sind, dass sie sich um jeweilige Horizontalachsen (42) drehen.
7. Seiltransportsystem nach einem der vorangehenden Ansprüche, das umfasst: zwei Halteseile
(6), wobei der Aufspannkörper (23) zwei parallele längliche seitliche Längsabsätze
(24) umfasst, von denen jeder Halte- und Führungsmittel (25, 26) umfasst, die sich
für ein jeweiliges Halteseil (6) entlang einer jeweiligen Bewegungsbahn (T2) erstrecken;
und eine Anzahl von Querrippen (27), welche die zwei Absätze (24) miteinander verbinden;
wobei jedes Paar benachbarter Rippen (27) zusammen mit den Absätzen (24) ein Fenster
(28) definiert, in das von einer jeweiligen Rolle (21) zum Halten und Führen des Zugkabels
(7) eingegriffen wird.
8. Seiltransportsystem nach Anspruch 7, wobei jede Rippe (27) an der Oberseite durch
einen aufwärtsgekrümmten konkaven Rand (29) mit einer mittleren Aussparung (30) eingefasst
ist, welche den gekrümmten Rand (29) in zwei geneigte Seiten trennt, die in Richtung
der Aussparung (30) konvergieren; wobei die Aussparungen (30) ausgerichtet sind, um
einen Kanal (32) zu definieren, der sich entlang der ersten Bewegungsbahn (T1) erstreckt.
9. Seilbahntransportsystem nach Anspruch 8, wobei die Endabschnitte, die zu der jeweiligen
Aussparung (30) benachbart sind, der geneigten Seiten jeder Rippe (27) mit jeweiligen
geneigten konvergierenden Auflagern (31) versehen sind.
10. Rollenbatterie, wie in Anspruch 1 beschrieben, für ein Seiltransportsystem nach einem
der vorangehenden Systeme.
1. Système de transport par câble comprenant un câble de traction (7) ; au moins un câble
de support (6) ; une unité de transport (8) comprenant une nacelle (9) supportée par
le câble de support (6) et pouvant être raccordée sélectivement au câble de traction
(7) par une pince (10) ; et au moins un jeu de galets fixe (4) comprenant une succession
de galets (21) répartis le long d'une première trajectoire (T1) pour supporter et
guider le câble de traction (7), et un sabot fixe (23) destiné à supporter et guider
le câble de support (6) le long d'une seconde trajectoire (T2) s'étendant le long
de la première trajectoire (T1) ; les première et seconde trajectoires (T1, T2) définissant
respectivement, en projection dans un plan horizontal, des premier et second chemins
(P1, P2) comprenant respectivement des première et seconde portions incurvées (33,
36) ; système dans lequel, le long du jeu de galets (4) et lorsque la nacelle (9)
est placée, en utilisation, le long du jeu de galets (4), le câble de traction (7)
comprend une portion de suspension (39) qui est détachée des galets (21) et dont une
partie centrale est située au niveau de la pince (10), et deux parties d'extrémité
rectilignes (40) s'étendent depuis la pince (10) en direction des galets (21) ; le
système de transport par câble étant caractérisé en ce que la première portion incurvée (33) s'étend le long d'une courbe d'enveloppe des projections
horizontales desdites parties d'extrémité rectilignes (40) dans les positions successives
occupées par les parties d'extrémité rectilignes (40) lorsque la nacelle (9) se déplace,
en utilisation, le long de la seconde portion incurvée (36).
2. Système de transport par câble selon la revendication 1, dans lequel les première
et seconde portions incurvées (33, 36) sont des portions intermédiaires des premier
et second chemins (P1, P2) respectivement ; et dans lequel le premier chemin (P1)
comprend également deux premières portion d'extrémité rectilignes (34, 35) sur des
côtés opposés de la première portion incurvée (33) ; et le second chemin (P2) comprend
également deux secondes portions d'extrémité rectilignes (37, 38) sur des côtés opposés
de la seconde portion incurvée (36) ; chaque première portion d'extrémité rectiligne
(34 ; 35) étant parallèle à une seconde portion d'extrémité rectiligne respective
(37 ; 38).
3. Système de transport par câble selon l'une des revendications précédentes, dans lequel
les galets (21) le long de la première portion incurvée (33) sont des galets inclinés
(21b) montés de façon à tourner autour d'axes respectifs (43), lesquels sont inclinés
de telle sorte qu'une portion périphérique supérieure, avec laquelle le câble de traction
(7) est engagée, de chaque galet incliné (21b) est dirigée vers l'extérieur par rapport
à la seconde portion incurvée (36).
4. Système de transport par câble selon la revendication 3, dans lequel chaque galet
incliné (21b) présente une surface extérieure définie par deux surfaces tronconiques
opposées (44, 45) définissant une gorge en V annulaire (46).
5. Système de transport par câble selon la revendication 3 ou 4, dans lequel l'axe (43)
de rotation de chaque galet incliné (21b) forme un angle de 5° à 45° par rapport à
l'horizontale.
6. Système de transport par câble selon l'une quelconque des revendications précédentes,
dans lequel les galets (21) le long de chaque première portion d'extrémité rectiligne
(34 ; 35) sont des galets cylindriques (21a) montés de façon à tourner autour d'axes
horizontaux respectifs (42).
7. Système de transport par câble selon l'une des revendications précédentes, et comprenant
deux dits câbles de support (6), et dans lequel le sabot (23) comprend deux épaulements
(24) latéraux, longitudinaux, allongés et parallèles qui supportent chacun des moyens
de support et de guidage (25, 26) s'étendant le long d'une seconde trajectoire respective
(T2) destinés à un câble de support respectif (6) ; et un certain nombre de nervures
transversales (27) raccordant les deux épaulements (24) l'un à l'autre ; chaque paire
de nervures adjacentes (27) définissant, conjointement avec les épaulements (24),
une fenêtre (28) avec laquelle s'engage un galet correspondant (21) destiné à supporter
et guider le câble de traction (7).
8. Système de transport par câble selon la revendication 7, dans lequel chaque nervure
(27) est limitée en haut par un bord (29) incurvé concave vers le haut comportant
un évidement central (30) qui divise le bord incurvé (29) en deux côtés obliques convergents
vers le bas en direction de l'évidement (30) ; les évidements (30) étant alignés de
façon à définir un canal (32) s'étendant le long de la première trajectoire (T1).
9. Système de transport par câble selon la revendication 8, dans lequel les portions
d'extrémité, adjacentes à l'évidement correspondant (30), desdits côtés obliques de
chaque nervure (27) sont dotées de patins convergents inclinés respectifs (31).
10. Jeu de galets tel que décrit dans la revendication 1 et destiné à un système de transport
par câble selon l'une quelconque des revendications précédentes.