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(11) | EP 0 171 386 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
GUIDING ON DEVICE FOR WINCHDRUM SEILFÜHRUNGSVORRICHTUNG FÜR WINDETROMMEL DISPOSITIF DE GUIDAGE POUR TAMBOUR DE TREUIL |
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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). |
[0001] The invention concerns an appliance which becomes necessary to wind a wire evenly over the full length of the drum in cases where the fleet angle exceeds approx. 4° or where the distance of the lead or fixed sheave in front of the drum is shorter than approx. 7 times the drumlength (fig. 1 ).
[0002] Conventional spooling arrangements adjust the wire position opposite the drum by means of mechanical drives, the invention however, belongs to the category working on the principle that the appliance is directed by the previously laid-on drumwinding alone and all other influences are eliminated.
[0003] This condition is fulfilled if, in any position of the spooling gear between drum (3) and fixed lead (2), the total length of wire between the meeting points on drum and sheave remains constant (fig. 2, a+c=a'+c'). As the taut wire always tries to find the shortest distance between those two points and if this does not exist, there will be no preference for any position at all. The spooler must therefore, apart from moving along the drum also travel along a path such that a+c remains constant. This path lies in a plane perpendicular to the wire and proves to be almost circular with a radius R depending on the distances a, b, c, the angle of the wire at the spooler sheave.
[0004] Because the force generated by the wire in the spooler should not influence the movement either, it is necessary that the direction of this force must be perpendicular to the path and should not cause interfering resistances along the path.
[0005] A well known device fulfilling these conditions is known from FR-A-1 299 936 and produces the required path by means of a sheave rotating and translating along a shaft which in turn, by means of cranks placed at either end at different angles, makes an oscillating movement in front of the drum, the character of the path being governed by the length and angle of the cranks.
[0006] The use of swiveling bearings for this shaft restricts the cranklength in comparison with the drum length and so the application to the condition a>2.4 b.
[0007] For these long drums and high loads special high tensile materials are required. In addition, complicated dismounting and provisions for maintaining the proper position of the sheave when the wire slackens are necessary. Another type of cable guiding device corresponding to the first part of claim 1 is known from CH-A-458 668.
[0008] In another well known device disclosed in FR-A-1 016 031 the required path is produced by a "tumbler" sheave, pivoting on a foundation in front of the drum such that the tangent to drum and fixed lead halves the tumblers height, causing the wire reaction to point at the hinge.
[0009] The invention aims at a device with applications up to a=b, merely depending on the wire run over the leadsheave (2) with the intention to realise more compact winch arrangements by simpler means and minimum a+c.
[0010] This condition determines various related factors e.g. each ratio a/c determines one optimum curve/radius and minimum size of the spooler related to b.
[0011] It also indicates that the number of layers on the drum has limits, if the tangent cuts the tumbler above midheight, then a preference for the central part of the drum will be shown (empty drum) whereas guiding on to a full drum a preference for the sides will be shown. Due to the steering forces developed by the wire already on the drum, the working range between unacceptable preferences is sufficient for practical use and can be increased by choosing a larger tumbler than the minimum size.
[0012] Besides: the tendency to cover the sides of a full drum may be useful in cases where a mechanically driven tumbler spooler may be advantageous in comparison with the usual transverse guiding-on gear with diamond threaded drive shaft, where the required force is much heavier (fig. 5) and the means weaker.
[0013] A practical way of producing the required path is found in a tumbler not having a fixed hinge pin, but a round toe which while rocking is also rolling over a transverse rail, thus reducing the physical dimensions of the tumbler, reducing support pressure by spreading it over a larger surface and enabling the device to be counterbalanced so that, when the wire slackens, it remains in its original position (fig. 3).
[0014] The transverse rail or surface frame may be straight (S2) or almost straight (S1 or S3), as a slight curvation may alter the performance and can be applied as a mean of correction or adjusting of retrofitted modifications.
[0015] Structurally the generated forces in the tumbler do not require the use of special material or parts.
[0016] A centering system to ensure the tumbler is kept central in front of the drum using cross wire ropes and a wide enough toe to ensure lateral stability is simpler but sufficient.
[0017] A further measure to minimize sheave wear is given by an additional hinge point in the centreline of the winch, at a certain distance from the device causing the toe to swing gradually over the rail in order to swivel the sheave in the correct angle of the wire run from drum to fixed lead.
[0018] This may be realized by means of a protruding cam near the bottom of the toe reaching into a fixed camplate, in which it moves vertically up and down when the tumbler rocks and rolls.
1. A cable guiding device to be movably mounted between a cable winding drum (3) and
its fixed cable lead (2), said device having a frame structure which is provided with
frame guiding means allowing the frame structure to undergo a rocking movement along
a definite traverse path or track while said cable being correctly wound onto said
cable drum, a cable guider sheave (4) being rotatably supported by said frame structure,
said frame guiding means consisting of a frame supporting means cooperating with a
fixed frame running surface track characterised, in that said frame supporting means
has the shape of a convex sector of substantial width to withstand applicable cable
loads, said sector extending to one or both sides of said frame structure, and rolling
along said traverse running surface during said rocking movement of the frame structure.
2. Device according to claim 1, characterised, in that the centre of gravity of said
frame structure is located in the near vicinity of its axis of rotation while rocking,
so that the device does not change its position when the cable would slacken.
3. Device according to claim 1 or 2, characterised, in that the traverse running surface
track is a straight (S2) or slight convex (S3) or concave (S1) surface.
4. Device according to one of the foregoing claims, characterised in that the frame
structure nearby its convex sector is provided with a cam and cam plate system for
directing the sheave and the frame structure automatically in the correct angle position
for the cable to be wound.
5. Device according to anyone of the foregoing claims, characterised, in that separate
driving means are provided for the purpose of controlling the performance.
1. Vorrichtung zum Führen von Windenkabel welche Vorrichtung, die beweglich angeordnet
ist zwischen einem Windenkabeltrommel (3) und dem zugehörigen festen Kabelführer (2),
einen Rahmenaufbau aufweist der versehen ist mit Rahmenführungsorgane die es ermöglichen
dass der Rahmenaufbau an einer Pendelbewegung unterworfen wird die quer auf die Kabelrichtung
steht wenn der Kabel korrekterweise auf den Kabeltrommel gespult wird und wobei eine
Kabelführungsrolle (4) drehbar von dem Rahmen unterstützt wird und die Rahmenführungsorgane
gebildet werden von einem Rahmenstützelement das mit einem festen Rahmenlauffläche
zusammenwirkt, dadurch gekennzeichnet, dass das Rahmenstützelement gebildet ist als
ein konvexer Sektor mit einer bestimmten Breite zur Aufnahme von den angewandten Kabelbelastungen
wobei sich die der Sektor einseitig oder beidseitig des Rahmenaufbaus erstreckt der
sich abrollt über die Rahmenlauffläche während der Pendelbewegung des Rahmens.
2. Vorrichtung nach Patentanspruch 1, dadurch gekennzeichnet, dass der Schwerpunkt
des Rahmenaufbaus sich in der Nähe des eigenen Rotationsachses befindet während der
Pendelbewegung und somit die Vorrichtung seine Position nicht ändert bei vorübergehendem
Wegfall der Kabelspannung.
3. Vorrichtung nach Patentansprüche 1 oder 2, dadurch gekennzeichnet, dass die querstehende
Rahmenlauffläche gebildet ist als eine flache Oberfläche (S2), eine leicht konvexe
Oberfläche (S3) oder eine konkave Oberfläche (S1).
4. Vorrichtung nach einer der vorgehenden Patentansprüchen, dadurch gekennzeichnet,
dass der Rahmenaufbau in der Nähe des konvexen Sektors versehen ist mit einem Nocken
und zugehörigen Nockenführungssystem das die Kabelführungsrolle und des Rahmen selbsttätig
in der richtigen Winkelposition für den aufzuspulenden Kabel bringt.
5. Vorrichtung nach einem der vorgehenden Patentansprüchen, dadurch gekennzeichnet,
dass Sonderantriebsmittel vorgesehen sind zur Steuerung der Pendelbewegung.
1. Dispositif de guidage correct pour câble situé mobilement entre un tambour (3)
permettant d'enrouler plusieurs tours de âbles et un galet de guidage (2) de câble
fixe, ce dispositif constitué d'un cadre configuré, comportant des organes de guidage
de cadre afin que le cadre subisse un mouvement oscillant selon un trajet à travers
de la direction du câble pendant l'enroulement correct de câble sur le tambour, un
rouleau de guidage de câble (4) est monté à rotation dans ce cadre configuré, les
organes de guidage sont constitués des moyens de support de cadre configuré coopérant
avec une surface de roulement fixe, caracterisé en ce que ces moyens de support de
cadre configuré sont constitués en forme d'un secteur d'un largeur substantiel à résister
à des tensions de câble appliquées, ce secteur s'étendant à un ou deux côtés du cadre
configuré et s'enroulant sur ce surface d'enroulement pendant ce mouvement oscillant
du cadre configuré.
2. Dispositif de guidage de câble selon la revendication 1, caracterisé en ce que
le centre de gravité de ce cadre configuré se constitue dans la vicinité directe de
l'axe de rotation pendant le mouvement oscillant de manière que le dispositif de guidage
ne changera pas de position si le câble perdrait sa tension.
3. Dispositif de guidage de câble selon les revendication 1 ou 2, caracterisé en ce
que la surface traverse d'enroulement est constituée par une surface plane (S2), une
surface légèrement convexe (S3) ou une surface concave (S1).
4. Dispositif selon une des revendications antérieures, caracterisé en ce que le cadre
configuré est prévu, dans la vicinité du secteur concave, d'un système de came et
de came à tôle pour diriger le rouleau de guidage ainsi que le cadre configuré automatiquement
dans une position correcte d'enroulement de câble.
5. Dispositif de guidage de câble selon une des revendications antérieures, caracterisé
en ce que des moyens d'entraînement sont prévus à contrôler son opération.