EP0401099B1 - Apparatus for driving a load carrying strap with a coordinated device for deflection of the load and guiding of the strap - Google Patents
Apparatus for driving a load carrying strap with a coordinated device for deflection of the load and guiding of the strap Download PDFInfo
- Publication number
- EP0401099B1 EP0401099B1 EP90401406A EP90401406A EP0401099B1 EP 0401099 B1 EP0401099 B1 EP 0401099B1 EP 90401406 A EP90401406 A EP 90401406A EP 90401406 A EP90401406 A EP 90401406A EP 0401099 B1 EP0401099 B1 EP 0401099B1
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- European Patent Office
- Prior art keywords
- lever
- strap
- roller
- rollers
- load
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
- B66D1/60—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes
- B66D1/74—Capstans
- B66D1/7415—Friction drives, e.g. pulleys, having a cable winding angle of less than 360 degrees
Definitions
- the invention relates to an apparatus with a driving pulley ensuring the drive of a link carrying a load at one of its ends and, more particularly, such an apparatus comprising a member for tightening the link against the peripheral surface of the pulley actuated from a deflection of the load.
- Apparatus comprising a drive pulley device, moved manually or mechanically, which scrolls on the periphery of this pulley a link carrying a load without storing it, this link generally being of round section, for example a cable.
- this link generally being of round section, for example a cable.
- the adhesion of the link to the peripheral surface of the pulley is ensured by the clamping pressure, on the wound part of the link, of a pivoting member or a series of pivoting members such as rollers.
- this pressure can be exerted in particular by the effect a deflection of the load transmitted, by levers, to this or these members from a deflector means such as a roller.
- Document FR-A-2 217 259 discloses a device for driving a flexible link carrying a load at one of its ends, which comprises a drive pulley moved manually or mechanically on the surface peripheral of which a link tightening member is applied, connected by a mechanical actuating link to a deflection member cooperating with the load. Said connection is effected according to a system of three levers, comprising two lateral levers and an intermediate lever, articulated at the ends of each of them at four points determining a deformable quadrilateral.
- the two ends of the system each pivot at a fixed point on the support frame of the device, and one of the side levers of said system carries the load deflection member, while the other side lever located on the side of the strand slack of the link carries the link tightening member on the peripheral surface of the pulley.
- the object of the present invention is to provide a particularly effective solution to these problems by its simplicity and efficiency, in particular for ensuring a guided tension of the soft strand of the link at its exit from the pulley, by coordinating the guidance and the drive of the two strands of the link from a deflection of the load.
- the device for driving a flexible link carrying a load at one of its ends comprises a drive pulley moved manually or mechanically on the peripheral surface of which a member is applied for tightening the link, connected by a mechanical actuating link to a deflection member cooperating with the load, said link being effected according to a system of three levers, comprising two lateral levers and an intermediate lever, articulated at the ends of each of them in four determining points a deformable quadrilateral, the two ends of the system each pivoting at a fixed point on the carrying frame of the device, one of the levers of said system being carrying the deflection member for the load, while one of the lateral levers, located on the side of the soft strand of the link, carries the member for tightening the link on the peripheral surface of the pulley.
- the lever carrying the deflection member is the intermediate lever, in that said quadrilateral is a parallelogram, and in that the intermediate lever, carrying the deflecting roller, also carries two guide rollers arranged nearby one from the other and whose axes are aligned with the axis of the deflecting roller along the longitudinal axis of the intermediate lever, one of said guide rollers being disposed in a central position near the deflecting roller to press the strand loaded with the link against this deflecting roller, while the other guide roller presses the soft strand of the link against the central guide roller, the rotation of the deflection roller causing that of the two guide rollers to ensure both guidance and drive of the soft strand of the link at an identical speed and in the opposite direction to that of the loaded strand.
- the axes of the latter are mounted in oblong openings the largest dimension of which is oriented along the longitudinal axis of the lever carrying said rollers, the axis of the extreme roller located on the side of the soft strand being biased by a spring in the direction of the axis of the deflector roller.
- a clutch lever is provided which is pivotally mounted on a fixed fixed axis. of the carrying frame of the device and which acts on the intermediate lever.
- the release lever allows to apply a reverse translation to the intermediate lever the direction of biasing of the pre-tightening spring which is applied thereto, so as to cancel the action of this spring and to separate the clamping member from the peripheral surface of the pulley.
- the release lever is articulated on the intermediate lever by the axis of the guide roller located on this lever on the side of the soft strand of the link.
- an actuation of the release lever results first of all in the cancellation of the action of the spring associated with this roller, and therefore in a first phase by the separation of the rollers concerned from the strands of the link which they provide training and guidance.
- this action results in the neutralization of the pre-clamping spring acting on the intermediate lever, by applying a translation to the latter, causing the clamping member to become detached from the peripheral surface of the pulley.
- this clamping member may be in the form of a bogie articulated on the lateral lever and comprising several pressure rollers.
- the intermediate lever has in its central part a guide block in which two holes are made for the passage of the two strands of the cable, at least the hole intended for the load carrying strand being oriented, along its length, in the direction of alignment of the device on the load.
- the peripheral profile of the tightening rollers is the counter-profile of the peripheral profile of the drive pulley. It is the same for the peripheral profile of the intermediate guide roller relative to the profile of the other two rollers with which he cooperates.
- the peripheral surface of the drive pulley is flat with two lateral shoulders between which is inserted the flat peripheral surface of the pressure rollers, while the flat peripheral surface the intermediate guide roller is inserted between the lateral shoulders of the flat peripheral surfaces of the two lateral guide rollers, one of which is constituted by the deflector roller.
- the chassis 1 of the device according to the invention equipped with a member mooring A and which carries a drive pulley 2 mounted to rotate, under the action of motor means (not shown), around a transverse horizontal shaft 3.
- the peripheral surface 4 of the pulley 2 is flat with two lateral shoulders 4 'between which is inserted a strap 5 to the strand 6 which is attached the load (not shown) while the other strand 7 is not loaded.
- a lateral lever 9 On an axis 8 carried by the chassis 1 is articulated the end of a lateral lever 9 whose other end is articulated around an axis 10 at one end of a horizontal intermediate lever 11. The other end of the lever 11 is articulated around an axis 12 at the lower end of a lateral lever 13 parallel to the lever 9 and mounted to pivot at its upper end around an axis 14 carried by the chassis 1.
- the axes of rotation 8, 10,12,14 are arranged so that the levers 9,11 and 13 determine a deformable parallelogram.
- the lateral lever 9 carries a bogie 15 comprising three rollers 16, each of these rollers having a flat peripheral surface 17 (see FIG. 5) intended to engage between the shoulders 4 ′ of the periphery of the pulley 2 to tighten the strap 5 against this pulley.
- the intermediate lever 11 carries, aligned side by side, three rollers comprising a deflector roller 18 and two guide rollers 19 and 20.
- the axis 21 around which the deflector roller 18 can rotate is fixed in openings facing the two flat rods 22,22 'constituting the intermediate lever 11, the deflector roller 18 being disposed between these two rods.
- the axis 23 of the intermediate guide roller 19 is mounted to move freely in oblong openings 24, 24 ′ oriented along the longitudinal axis of the lever 11.
- the other guide roller 20 On the other side of the deflecting roller 18, relative to the intermediate guide roller 19, is arranged the other guide roller 20 whose axis 25 is mounted in oblong openings 26,26 'of the rods 22,22' oriented in the extension of the openings 24,24 '.
- Tension springs 27, 27 ′ connect the axes 21 and 25 together to constrain the guide rollers 19, 20 towards the deflection roller 18.
- Between the deflection roller 18 and the intermediate guide roller 19 passes the loaded strand 6 of the strap 5 which is applied by the roller 19 against the flat peripheral part of the roller 18.
- the soft strand 7 of the strap 5 is applied by the roller 19 against the flat peripheral part of the roller 20.
- a clutch lever 30 is provided, an intermediate part is articulated at 31 on the chassis 1.
- the end of the lever 30 opposite its actuating part is articulated on the intermediate lever 11 by the axis 25 of the guide roller 20.
- the intermediate lever 11 in order to ensure maximum guidance to the two strands of the strap 5, comprises in its central part a guide block 32 (see FIG. 4) in which two holes 33, 34 are made through which the strands 7 and 6 of the strap 5, these two orifices being oriented, along their length, in the direction of alignment of the device on the load.
- the guide block 32 has, towards the point of exit of each strand of the strap 5 of the drive space between the two rollers cooperating with the strand, an extension 35, 35 'avoiding a deviation of said strand at its exit from the rollers.
- a folded guide plate 36 which is fixed so that its two lateral faces have their ends very close to the peripheral surface of the pulley 2. This avoids a deflection of the strands 6, 7 on their path between the winding arc of the strap 5 on the pulley and the guide rollers 18, 19 20.
- Another guide plate 37 is disposed at the periphery of the pulley 2, and extends from the point where the loaded strand 6 of the strap leaves the deflector roller 18 to the point where it cooperates with the tightening rollers 16 , thereby ensuring that the strap 5 is guided when the device is put into battery.
- a safety guide roller 39 which cooperates with the face of the loaded strand 6 opposite to that cooperating with the deflector roller 18.
- This safety roller has the purpose of neutralizing the pendulum movement that the loaded strand 6 of the strap is capable of taking under the effect of the load and thus preventing a lateral displacement is applied to the intermediate lever 11, in particular in the tending direction to remove the pre-tightening.
- the lower end of the orifice 34 for passage of the loaded strand 6 has a flared shape.
- a compression spring 40 engages by one of its ends the axis 25 of the roller 20 while its opposite end bears on the terminal portion 41 in the form of a fork of the clutch release lever 30.
- the operating rod 42 of the declutching lever 30 is mounted on a spring 43 and carries a transverse axis 44 designed to move in a groove 45, formed in the casing 47 of the device, when the lever 30 is operated.
- the groove 45 has a shape such that the axis 44 is wedged in one end 46 of this groove when the lever 30 is in its engaged position shown in dotted lines in FIG. 6.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Basic Packing Technique (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Description
L'invention concerne un appareil à poulie motrice assurant l'entraînement d'un lien porteur d'une charge à l'une de ses extrémités et, plus particulièrement, un tel appareil comportant un organe de serrage du lien contre la surface périphérique de la poulie actionné à partir d'une déflection de la charge.The invention relates to an apparatus with a driving pulley ensuring the drive of a link carrying a load at one of its ends and, more particularly, such an apparatus comprising a member for tightening the link against the peripheral surface of the pulley actuated from a deflection of the load.
On connait des appareils comprenant un dispositif de poulie d'entraînement, mue manuellement ou mécaniquement, qui fait défiler sur la périphérie de cette poulie un lien porteur d'une charge sans l'emmagasiner, ce lien étant généralement de section ronde, par exemple un câble. Dans un tel dispositif, l'adhérence du lien à la surface périphérique de la poulie est assurée par la pression de serrage, sur la partie enroulée du lien, d'un organe pivotant ou d'une série d'organes pivotants tels que des galets, cette pression pouvant être exercée notamment par l'effet d'une déflection de la charge transmise, par des leviers, à ce ou ces organes à partir d'un moyen déflecteur tel qu'un galet.Apparatus are known comprising a drive pulley device, moved manually or mechanically, which scrolls on the periphery of this pulley a link carrying a load without storing it, this link generally being of round section, for example a cable. In such a device, the adhesion of the link to the peripheral surface of the pulley is ensured by the clamping pressure, on the wound part of the link, of a pivoting member or a series of pivoting members such as rollers. , this pressure can be exerted in particular by the effect a deflection of the load transmitted, by levers, to this or these members from a deflector means such as a roller.
L'application d'un dispositif de ce genre à l'entraînement de liens souples plats, tels que des sangles, pose des problèmes particuliers d'entraînement et de guidage auxquels des solutions ont été apportées par exemple par les brevets français N° 1 121 039 et N° 1 389 136 ainsi que par les demandes de certificats d'addition français N° 88.07611 et N° 88.14700.The application of a device of this kind to the drive of flexible flexible links, such as straps, poses particular problems of drive and guidance to which solutions have been provided for example by French patents No. 1,121 039 and N ° 1 389 136 as well as by requests for French addition certificates N ° 88.07611 and N ° 88.14700.
Par le document FR-A-2 217 259 on connaît un dispositif pour l'entraînement d'un lien souple porteur d'une charge à l'une de ses extrémités, qui comprend une poulie d'entraînement mue manuellement ou mécaniquement sur la surface périphérique de laquelle s'appplique un organe de serrage du lien, relié par une liaison mécanique d'actionnement à un organe de déflection coopérant avec la charge. Ladite liaison s'effectue suivant un système de trois leviers, comprenant deux leviers latéraux et un levier intermédiaire, articulés aux extrémités de chacun d'eux en quatre points déterminant un quadrilatère déformable. Les deux extrémités du système pivotent chacune en un point fixe du châssis porteur du dispositif, et l'un des leviers latéraux dudit système est porteur de l'organe de déflection de la charge, alors que l'autre levier latéral situé du côté du brin mou du lien porte l'organe de serrage du lien sur la surface périphérique de la poulie.Document FR-A-2 217 259 discloses a device for driving a flexible link carrying a load at one of its ends, which comprises a drive pulley moved manually or mechanically on the surface peripheral of which a link tightening member is applied, connected by a mechanical actuating link to a deflection member cooperating with the load. Said connection is effected according to a system of three levers, comprising two lateral levers and an intermediate lever, articulated at the ends of each of them at four points determining a deformable quadrilateral. The two ends of the system each pivot at a fixed point on the support frame of the device, and one of the side levers of said system carries the load deflection member, while the other side lever located on the side of the strand slack of the link carries the link tightening member on the peripheral surface of the pulley.
La présente invention a pour objet d'apporter à ces problèmes une solution particulièrement performante par sa simplicité et son efficacité, notamment pour assurer une tension guidée du brin mou du lien à sa sortie de la poulie, en coordonnant le guidage et l'entraînement des deux brins du lien à partir d'une déflection de la charge.The object of the present invention is to provide a particularly effective solution to these problems by its simplicity and efficiency, in particular for ensuring a guided tension of the soft strand of the link at its exit from the pulley, by coordinating the guidance and the drive of the two strands of the link from a deflection of the load.
Selon l'invention, le dispositif pour l'entraînement d'un lien souple porteur d'une charge à l'une de ses extrémités, comprend une poulie d'entraînement mue manuellement ou mécaniquement sur la surface périphérique de laquelle s'applique un organe de serrage du lien, relié par une liaison mécanique d'actionnement à un organe de déflection coopérant avec la charge, ladite liaison s'effectuant suivant un système de trois leviers, comprenant deux leviers latéraux et un levier intermédiaire, articulés aux extrémités de chacun d'eux en quatre points déterminant un quadrilatère déformable, les deux extrémités du système pivotant chacune en un point fixe du châssis porteur du dispositif, l'un des leviers dudit système étant porteur de l'organe de déflection de la charge, cependant que l'un des leviers latéraux, situé du côté du brin mou du lien, porte l'organe de serrage du lien sur la surface périphérique de la poulie. Il se caractérise en ce que le levier portant l'organe de déflection est le levier intermédiaire, en ce que ledit quadrilatère est un parallélogramme, et en ce que le levier intermédiaire, porteur du galet déflecteur, porte également deux galets de guidage disposés à proximité l'un de l'autre et dont les axes sont alignés avec l'axe du galet déflecteur selon l'axe longitudinal du levier intermédiaire, l'un desdits galets de guidage étant disposé en position centrale à proximité du galet déflecteur pour presser le brin chargé du lien contre ce galet déflecteur, alors que l'autre galet de guidage presse le brin mou du lien contre le galet central de guidage, la rotation du galet déflecteur entraînant celle des deux galets de guidage pour assurer à la fois le guidage et l'entraînement du brin mou du lien à une vitesse identique et de sens inverse à celle du brin chargé.According to the invention, the device for driving a flexible link carrying a load at one of its ends, comprises a drive pulley moved manually or mechanically on the peripheral surface of which a member is applied for tightening the link, connected by a mechanical actuating link to a deflection member cooperating with the load, said link being effected according to a system of three levers, comprising two lateral levers and an intermediate lever, articulated at the ends of each of them in four determining points a deformable quadrilateral, the two ends of the system each pivoting at a fixed point on the carrying frame of the device, one of the levers of said system being carrying the deflection member for the load, while one of the lateral levers, located on the side of the soft strand of the link, carries the member for tightening the link on the peripheral surface of the pulley. It is characterized in that the lever carrying the deflection member is the intermediate lever, in that said quadrilateral is a parallelogram, and in that the intermediate lever, carrying the deflecting roller, also carries two guide rollers arranged nearby one from the other and whose axes are aligned with the axis of the deflecting roller along the longitudinal axis of the intermediate lever, one of said guide rollers being disposed in a central position near the deflecting roller to press the strand loaded with the link against this deflecting roller, while the other guide roller presses the soft strand of the link against the central guide roller, the rotation of the deflection roller causing that of the two guide rollers to ensure both guidance and drive of the soft strand of the link at an identical speed and in the opposite direction to that of the loaded strand.
Afin d'assurer, dans de bonnes conditions, la coopération du galet déflecteur avec les deux autres galets, les axes de ces derniers sont montés dans des ouvertures oblongues dont la plus grande dimension est orientée suivant l'axe longitudinal du levier porteur desdits galets, l'axe du galet extrême situé du côté du brin mou étant sollicité par un ressort en direction de l'axe du galet déflecteur. De cette façon, la coopération des trois galets pour le guidage et l'entraînement positif du brin mou est assurée quelle que soit l'épaisseur ou le diamètre du lien, dans les limites maximum tolérables par le mécanisme ainsi construit.In order to ensure, under good conditions, the cooperation of the deflecting roller with the other two rollers, the axes of the latter are mounted in oblong openings the largest dimension of which is oriented along the longitudinal axis of the lever carrying said rollers, the axis of the extreme roller located on the side of the soft strand being biased by a spring in the direction of the axis of the deflector roller. In this way, the cooperation of the three rollers for guiding and positive drive of the soft strand is ensured whatever the thickness or the diameter of the link, within the maximum limits tolerable by the mechanism thus constructed.
Afin de faciliter l'introduction et le passage du lien dans le mécanisme d'entraînement, pour la mise en batterie de l'appareil avant que la charge y soit appliquée, on prévoit un levier de débrayage qui est monté pivotant sur un axe fixe solidaire du châssis porteur de l'appareil et qui agit sur le levier intermédiaire. Le levier de débrayage permet d'appliquer au levier intermédiaire une translation en sens inverse du sens de sollicitation du ressort de préserrage qui s'y applique, de façon à annuler l'action de ce ressort et à désolidariser l'organe de serrage de la surface périphérique de la poulie.In order to facilitate the introduction and the passage of the link in the drive mechanism, for putting the device into battery before the load is applied to it, a clutch lever is provided which is pivotally mounted on a fixed fixed axis. of the carrying frame of the device and which acts on the intermediate lever. The release lever allows to apply a reverse translation to the intermediate lever the direction of biasing of the pre-tightening spring which is applied thereto, so as to cancel the action of this spring and to separate the clamping member from the peripheral surface of the pulley.
Suivant une forme de réalisation, le levier de débrayage s'articule sur le levier intermédiaire par l'axe du galet de guidage situé sur ce levier du côté du brin mou du lien. De cette façon un actionnement du levier de débrayage se traduit d'abord par l'annulation de l'action du ressort associé à ce galet, et donc dans une première phase par la désolidarisation des galets concernés d'avec les brins du lien dont ils assurent l'entraînement et le guidage. Dans une deuxième phase cette action se traduit par la neutralisation du ressort de préserrage agissant sur le levier intermédiaire, en appliquant à ce dernier une translation provoquant la désolidarisation de l'organe de serrage de la surface périphérique de la poulie. A titre d'exemple, cet organe de serrage peut se présenter sous la forme d'un bogie articulé sur le levier latéral et comportant plusieurs galets presseurs.According to one embodiment, the release lever is articulated on the intermediate lever by the axis of the guide roller located on this lever on the side of the soft strand of the link. In this way an actuation of the release lever results first of all in the cancellation of the action of the spring associated with this roller, and therefore in a first phase by the separation of the rollers concerned from the strands of the link which they provide training and guidance. In a second phase, this action results in the neutralization of the pre-clamping spring acting on the intermediate lever, by applying a translation to the latter, causing the clamping member to become detached from the peripheral surface of the pulley. By way of example, this clamping member may be in the form of a bogie articulated on the lateral lever and comprising several pressure rollers.
Afin que le guidage des deux brins du câble soit assuré avec le maximum de sécurité le levier intermédiaire comporte dans sa partie centrale un bloc de guidage dans lequel sont pratiqués deux orifices pour le passage des deux brins du câble, au moins l'orifice destiné au brin porteur de la charge étant axé, dans sa longueur, suivant la direction d'alignement de l'appareil sur la charge.So that the two strands of the cable are guided with maximum safety, the intermediate lever has in its central part a guide block in which two holes are made for the passage of the two strands of the cable, at least the hole intended for the load carrying strand being oriented, along its length, in the direction of alignment of the device on the load.
Lorsque le lien à entraîner est de section plate, ce qui constitue une application préférée du dispositif selon l'invention, le profil périphérique des galets de serrage est le contre-profil du profil périphérique de la poulie d'entraînement. Il en est de même du profil périphérique du galet intermédiaire de guidage par rapport au profil des deux autres galets avec lesquels il coopère.When the link to be driven is of flat section, which constitutes a preferred application of the device according to the invention, the peripheral profile of the tightening rollers is the counter-profile of the peripheral profile of the drive pulley. It is the same for the peripheral profile of the intermediate guide roller relative to the profile of the other two rollers with which he cooperates.
Selon une forme de réalisation particulière de l'appareil selon l'invention, la surface périphérique de la poulie d'entraînement est plate avec deux épaulements latéraux entre lesquels vient s'insérer la surface périphérique plate des galets presseurs, cependant que la surface périphérique plate du galet intermédiaire de guidage vient s'insérer entre les épaulements latéraux des surfaces périphériques plates des deux galets latéraux de guidage dont l'un est constitué par le galet déflecteur.According to a particular embodiment of the apparatus according to the invention, the peripheral surface of the drive pulley is flat with two lateral shoulders between which is inserted the flat peripheral surface of the pressure rollers, while the flat peripheral surface the intermediate guide roller is inserted between the lateral shoulders of the flat peripheral surfaces of the two lateral guide rollers, one of which is constituted by the deflector roller.
Pour bien faire comprendre l'invention on en décrira ci-après, à titre d'exemple sans caractère limitatif, une forme d'exécution et une variante en référence au dessin schématique annexé dans lequel :
- la figure 1 est une vue en élévation d'un dispositif selon l'invention pour l'entraînement d'une sangle ;
- la figure 2 est une vue de détail, à plus grande échelle, montrant le système de guidage à galets du dispositif de la figure 1 ;
- la figure 3 est une coupe horizontale transversale prise selon la ligne III-III de la figure 2 ;
- la figure 4 est une coupe horizontale transversale prise selon la ligne IV-IV de la figure 2 ;
- la figure 5 est une coupe verticale partielle prise selon la ligne V-V de la figure 1 ;
- la figure 6 est une vue en élévation d'une variante du dispositif selon la présente invention ; et
- la figure 7 est une coupe horizontale transversale prise selon la ligne VII-VII de la figure 6.
- Figure 1 is an elevational view of a device according to the invention for driving a strap;
- Figure 2 is a detail view, on a larger scale, showing the roller guide system of the device of Figure 1;
- Figure 3 is a horizontal cross section taken along line III-III of Figure 2;
- Figure 4 is a horizontal cross section taken along the line IV-IV of Figure 2;
- Figure 5 is a partial vertical section taken along the line VV in Figure 1;
- Figure 6 is an elevational view of a variant of the device according to the present invention; and
- FIG. 7 is a horizontal transverse section taken along line VII-VII of FIG. 6.
Au dessin on a représenté le châssis 1 de l'appareil selon l'invention, équipé d'un organe d'amarrage A et qui porte une poulie d'entraînement 2 montée pour tourner, sous l'action de moyens moteurs (non représentés), autour d'un arbre horizontal transversal 3. Comme on le voit à la figure 5, la surface périphérique 4 de la poulie 2 est plate avec deux épaulements latéraux 4' entre lesquels vient s'insérer une sangle 5 au brin 6 de laquelle est attachée la charge (non représentée) alors que l'autre brin 7 n'est pas chargé.In the drawing there is shown the chassis 1 of the device according to the invention, equipped with a member mooring A and which carries a
Sur un axe 8 porté par le châssis 1 est articulée l'extrémité d'un levier latéral 9 dont l'autre extrémité est articulée autour d'un axe 10 à une extrémité d'un levier intermédiaire horizontal 11. L'autre extrémité du levier 11 est articulée autour d'un axe 12 à l'extrémité inférieure d'un levier latéral 13 parallèle au levier 9 et monté pour pivoter à son extrémité supérieure autour d'un axe 14 porté par le châssis 1. Les axes de rotation 8,10,12,14 sont disposés de façon que les leviers 9,11 et 13 déterminent un parallélogramme déformable.On an
Le levier latéral 9 porte un bogie 15 comprenant trois galets 16, chacun de ces galets ayant une surface périphérique plate 17 (voir figure 5) destinée à s'engager entre les épaulements 4' de la périphérie de la poulie 2 pour serrer la sangle 5 contre cette poulie.The
Le levier intermédiaire 11 porte, alignés côte à côte, trois galets comprenant un galet déflecteur 18 et deux galets de guidage 19 et 20. Comme on le voit bien sur la figure 3, l'axe 21 autour duquel peut tourner le galet déflecteur 18 est fixé dans des ouvertures en regard des deux tringles plates 22,22' constituant le levier intermédiaire 11, le galet déflecteur 18 étant disposé entre ces deux tringles. L'axe 23 du galet de guidage intermédiaire 19 est monté pour se déplacer librement dans des ouvertures oblongues 24,24' orientées suivant l'axe longitudinal du levier 11. De l'autre côté du galet déflecteur 18, par rapport au galet de guidage intermédiaire 19, est disposé l'autre galet de guidage 20 dont l'axe 25 est monté dans des ouvertures oblongues 26,26' des tringles 22,22' orientées dans le prolongement des ouvertures 24,24'. Des ressorts de traction 27,27' relient ensemble les axes 21 et 25 pour contraindre les galets de guidage 19,20 vers le galet déflecteur 18. Entre le galet déflecteur 18 et le galet intermédiaire de guidage 19 passe le brin chargé 6 de la sangle 5 qui est appliqué par le galet 19 contre la partie périphérique plate du galet 18. De façon similaire, le brin mou 7 de la sangle 5 est appliqué par le galet 19 contre la partie périphérique plate du galet 20.The
On voit ainsi que la rotation du galet déflecteur 18 entraîne celle des deux autres galets 19,20, le brin mou 7 de la sangle 5 se trouvant ainsi à la fois guidé et entraîné à une vitesse identique et de sens inverse à celle du brin 6 auquel la charge est fixée. En raison de l'action des ressorts 27,27', la coopération des trois galets 18,19,20 est assurée quelle que soit l'épaisseur de la sangle 5, dans les limites maximum tolérables par le mécanisme.It is thus seen that the rotation of the deflecting
L'action de déflection de la charge, s'exerçant sur le galet 18, est transmise par le système de leviers articulés 9,11,13 aux galets de serrage 16. Un ressort de préserrage 28, s'appuyant dans une chape 29 fixée au châssis 1, exerce une poussée longitudinale sur le levier intermédiaire 11 dans le sens appliquant les galets de serrage 16 contre la périphérie de la poulie 2.The deflection action of the load, acting on the
Afin de faciliter l'introduction et le passage de la sangle 5 dans le mécanisme d'entraînement, pour la mise en batterie de l'appareil avant que la charge y soit appliquée, un levier de débrayage 30 est prévu dont une partie intermédiaire est articulée en 31 sur le châssis 1. L'extrémité du levier 30 opposée à sa partie d'actionnement s'articule sur le levier intermédiaire 11 par l'axe 25 du galet de guidage 20. Ainsi, une action effectuée sur le levier 30 dans le sens anti-horaire en regardant la figure 1 se traduit d'abord par la neutralisation de l'action des ressorts 27,27' en désolidarisant les galets 20 et 19 des brins 6 et 7 de la sangle 5, puis par une neutralisation du ressort de préserrage 28 provoquant la désolidarisation des galets de serrage 16 de la surface périphérique de la poulie 2.In order to facilitate the introduction and the passage of the
Le levier intermédiaire 11, afin d'assurer un maximum de guidage aux deux brins de la sangle 5, comporte dans sa partie centrale un bloc de guidage 32 (voir figure 4) dans lequel sont pratiqués deux orifices 33,34 par lesquels passent respectivement les brins 7 et 6 de la sangle 5, ces deux orifices étant axés, dans leur longueur, suivant la direction d'alignement de l'appareil sur la charge. Comme on le voit à la figure 2 le bloc de guidage 32 présente, vers le point de sortie de chaque brin de la sangle 5 de l'espace d'entraînement entre les deux galets coopérant avec le brin, une extension 35, 35' évitant une déviation dudit brin à sa sortie des galets.The
Dans l'espace compris entre la poulie 2 et les arcs des galets 18, 19, 20 lui faisant face, est disposée une plaque de guidage 36 pliée qui est fixée de façon que ses deux faces latérales aient leurs extrémités très proches de la surface périphérique de la poulie 2. On évite ainsi une déviation des brins 6, 7 sur leur trajet compris entre l'arc d'enroulement de la sangle 5 sur la poulie et les galets de guidage 18, 19 20.In the space between the
Une autre plaque de guidage 37 est disposée à la périphérie de la poulie 2, et s'étend depuis le point où le brin chargé 6 de la sangle sort du galet déflecteur 18 jusqu'au point où il vient coopérer avec les galets de serrage 16, en assurant ainsi un guidage de la sangle 5 lors de la mise en batterie de l'appareil.Another
A la partie inférieure du châssis 1 est monté, pour tourner librement autour d'un axe 38, un galet de guidage de sécurité 39 qui coopère avec la face du brin chargé 6 opposée à celle coopérant avec le galet déflecteur 18. Ce galet de sécurité a pour objet de neutraliser le mouvement pendulaire que le brin chargé 6 de la sangle est susceptible de prendre sous l'effet de la charge et d'éviter ainsi qu'un déplacement latéral soit appliqué au levier intermédiaire 11, en particulier dans la direction tendant à supprimer le préserrage. Pour le même but, l'extrémité inférieure de l'orifice 34 de passage du brin chargé 6 présente une forme évasée.At the lower part of the chassis 1 is mounted, to rotate freely about an
Aux figures 6 et 7 on a représenté une variante du dispositif des figures 1 à 5 et, dans ces figures, les éléments semblables à ceux du dispositif des figures 1 à 5 ont été désignés par les mêmes chiffres de référence.In Figures 6 and 7 there is shown a variant of the device of Figures 1 to 5 and, in these figures, elements similar to those of the device of Figures 1 to 5 have been designated by the same reference numerals.
Sur ces figures un ressort de compression 40 engage par une de ses extrémités l'axe 25 du galet 20 alors que son extrémité opposée s'appuie sur la partie terminale 41 en forme de fourche du levier de débrayage 30. La tige de manoeuvre 42 du levier de débrayage 30 est montée sur un ressort 43 et porte un axe transversal 44 conçu pour se déplacer dans une rainure 45, ménagée dans le carter 47 de l'appareil, lorsque le levier 30 est manoeuvré. La rainure 45 a une forme telle que l'axe 44 vient se caler dans une extrémité 46 de cette rainure lorsque le levier 30 est dans sa position embrayée représentée en trait pointillé sur la figure 6.In these figures a
On comprend que, lorsqu'on manoeuvre le levier 30 de sa position débrayée (en trait plein à la figure 6) à sa position embrayée (en trait pointillé à la figure 6), la poussée de la partie 41 du levier 30 sur le ressort 40 provoque dans un premier temps le contact de l'organe de serrage 16 contre la périphérie de la poulie 2 pour assurer un préserrage, puis dans un deuxième temps la coopération des galets 18, 19, 20 pour le guidage et l'entraînement positif du brin mou 7. Lors de la manoeuvre du levier 30 vers sa position débrayée, l'action du ressort 40 est annulée ce qui annule la coopération des galets 18, 19, 20 et l'effet de préserrage.It is understood that, when the
On comprendra que la description ci-dessus a été donnée à simple titre d'exemple, sans caractère limitatif, et que des adjonctions ou des modifications constructives pourraient y être apportées sans sortir du cadre de l'invention déterminé par les revendications annexées.It will be understood that the above description has been given by way of example, without limitation, and that additions or constructive modifications could be made without departing from the scope of the invention determined by the appended claims.
Claims (11)
- Device for driving a flexible strap (5) carrying a load at one of its ends, comprising a drive pulley (2) which is moved manually or mechanically, and against the peripheral surface (4) of which there bears a member (9, 16) for clamping the strap (5), connected by a mechanical actuating connection to a deflection member (18) cooperating with the load, the said connection being performed by a system of three levers, comprising two lateral levers (9,13) and an intermediate lever (11), each of which is articulated at its ends at four points (8, 10, 12, 14) determining a deformable quadrilateral, each of the two ends of the system pivoting at a fixed point (8, 14) of the supporting framework (1) of the device, one of the levers (11) of the said system carrying the load deflection member (18), whilst one of the two lateral levers (9) located on the slack side (7) of the strap (5) supports the device (15, 16) for clamping the strap (5) on the peripheral surface (4) of the pulley (2), characterised in that the lever supporting the deflection member (18) is the intermediate lever (11); in that the said quadrilateral is a parallelogram; and in that the intermediate lever (11), which carries the deflection roller (18), likewise carries two guide rollers (19, 20) which are disposed close to one another and of which the shafts (23, 25) are aligned with the shaft (21) of the deflection roller (18) along the longitudinal axis of the intermediate lever (11), the one (19) of the said guide rollers being disposed in a central position in the vicinity of the deflection roller (18) to urge the loaded side (6) of the strap (5) against the deflection roller (18), whereas the other guide roller (20) urges the slack side (7) of the strap (5) against the central guide roller (19), the rotation of the deflection roller (18) entraining that of the two guide rollers (19, 20) both to guide and drive the slack side (7) of the strap (5) at a speed which is identical to that of the loaded side (6), and in the opposite direction thereto.
- Device according to claim 1, characterised in that the shafts (23, 25) of the guide rollers (19, 20) are accommodated in elongate (24, 26) bearing means in the intermediate lever (11), which bearing means are directed along the longitudinal axis of this lever, the shaft (25) of the end guide roller (20) located on the slack side (7) being stressed by a spring (27, 40) in the direction of the shaft (21) of the deflection roller (18) to ensure permanent pressure contact of each pair of rollers (18, 19, 20) on the side (6, 7) which they guide, the central guide roller (19) being common to the two pairs of rollers (18, 19 - 19, 20).
- Device according to either of Claims 1 and 2, characterised by a spring (28, 40) which acts on the intermediate lever (11), along the longitudinal axis thereof, in the same direction as that of the deflection action applied by the load to exert a constant pre-clamping effect on the clamping member (15, 16) in the absence of the action of a load.
- Device according to Claim 3, characterised in that it comprises a disengaging lever (30) which pivots about a fixed point (31) of the supporting framework (1) and which acts on the intermediate lever (11) to allow a longitudinal displacement to be imparted thereto in the direction opposite to that of the displacement imparted by the pre-clamping spring (28, 40), in order to cancel the action thereof and to disconnect the clamping member (15, 16) from the peripheral surface (4) of the pulley (2).
- Device according to Claim 4, characterised in that the disengaging lever (30) acts on the intermediate lever (11) in the vicinity of the shaft (25) of the end guide roller (20) located on the edge of the slack side (7) of the strap (5), such that, in a first stage, the action of the disengaging lever (30) cancels the action of the spring (27) acting on the said end guide roller (20), thus disconnecting the rollers (18, 19, 20) from one another and then, in a second stage, displaces the intermediate lever (11) against the action of the pre-clamping spring (28), disconnecting the clamping member (15, 16) and the peripheral surface (4) of the drive pulley (2).
- Device according to any one of Claims 3 to 5, characterised in that the pre-clamping spring (28) bears at one end on a fixed point (29) of the supporting framework (1) whilst the other end thereof acts on the intermediate lever (11).
- Device according to any one of Claims 1 to 6, characterised in that it comprises a guide shield (36) covering the arc of the drive pulley (2) which is not covered by the winding of the strap (5), the said shield (36) being secured on the supporting framework (1) and having two lateral ends located extremely close to the peripheral surface of the pulley (2), in such a manner as to deflect the side (6, 7) of the strap (5) emerging from the pulley (2) from the circular path thereof which the movement of the pulley tends to impart thereto.
- Device according to any one of Claims 1 to 7, characterised by a guide block (32) integral with the central part of the intermediate lever (11) and, on the side opposite that of the drive pulley (2), covering the space delimited by the peripheral arcs of the three rollers (18, 19, 20) carried by this lever (11), two passages (33, 34) being provided in the said guide block (32) for the sides (6, 7) of the strap (5) and having, respectively, one of their orifices located at the point at which each side (6, 7) emerges from the two rollers (18, 19, 20) guiding it; at least the passage (34) intended for the loaded side (6) being directed longitudinally, in the direction of alignment of the supporting framework (1) on the load.
- Device according to any one of Claims 3 to 8, characterised by a safety roller (39) supported at the lower part of the framework (1) below the deflection roller (18) and in the vicinity of the loaded side (6), the said safety roller cooperating with the face of this side (6) which is opposite the face bearing against the deflection roller (18) in order to cancel the action tending to displace the intermediate lever (11) against the effect of the pre-clamping spring (28) as a result of a lack of alignment between the device and the load.
- Device according to Claims 2 to 4, characterised in that the spring (40) stressing the shaft (25) of the end guide roller (20) is a compression spring, of which one end is engaged by the end part (41) of the disengaging lever (30) in order to ensure that there is, firstly, a pre-clamping effect and then, secondly, cooperation of the rollers (18, 19, 20) when this lever (30) passes from its disengaged to its engaged position.
- Device according to Claim 10, characterised in that the rod (42) of the disengaging lever (30) is mounted on a spring (43) and supports a shaft (44) which is guided in a groove (45) in the casing (47) of the apparatus when the said lever (30) passes from its disengaged to its engaged position and vice versa, the said shaft (44) being locked in one end (46) of the groove (45) when the lever (30) is in the engaged position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8907015A FR2647427B1 (en) | 1989-05-29 | 1989-05-29 | APPARATUS FOR DRIVING A LOAD CARRIER, WITH COORDINATED DEVICE FOR DEFECTING THE LOAD AND GUIDING THE LINK |
| FR8907015 | 1989-05-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0401099A1 EP0401099A1 (en) | 1990-12-05 |
| EP0401099B1 true EP0401099B1 (en) | 1993-10-20 |
Family
ID=9382101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90401406A Expired - Lifetime EP0401099B1 (en) | 1989-05-29 | 1990-05-28 | Apparatus for driving a load carrying strap with a coordinated device for deflection of the load and guiding of the strap |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5129626A (en) |
| EP (1) | EP0401099B1 (en) |
| DD (1) | DD295605A5 (en) |
| DE (1) | DE69004007D1 (en) |
| FR (1) | FR2647427B1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1281929B1 (en) * | 1994-03-24 | 1998-03-03 | Giovanni Guntero Czaloun | COMPACT THROUGH ROPE TRACTION EQUIPMENT WITH CONTINUOUS ROPE DRIVING. |
| US6237502B1 (en) * | 1998-07-14 | 2001-05-29 | Richard Van Damme | Sheave arrangement suitable for slack pulling carriage |
| SG154361A1 (en) * | 2008-01-30 | 2009-08-28 | Seow Tiong Bin | A hoist |
| US7607644B1 (en) * | 2008-06-09 | 2009-10-27 | Acculift, Inc. | Boat lift assembly |
| CH702910A2 (en) * | 2010-03-16 | 2011-09-30 | Flakes S A | Winding device for flexible bond. |
| DE102010047704A1 (en) * | 2010-10-06 | 2012-04-12 | Demag Cranes & Components Gmbh | Hoist with a toothed belt as a suspension element |
| DE102012100099B4 (en) * | 2012-01-06 | 2015-06-11 | Columbus Mckinnon Industrial Products Gmbh | Traction hoist |
| LU92298B1 (en) * | 2013-10-28 | 2015-04-29 | Capital Access Sarl | Self-contained traction pulley winch |
Family Cites Families (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US219237A (en) * | 1879-09-02 | Improvement in stump-extractors | ||
| DE197356C (en) * | ||||
| US798635A (en) * | 1903-12-22 | 1905-09-05 | John Stevenson Jr | Apparatus for raising, lowering, or hauling weights. |
| US2684166A (en) * | 1951-09-10 | 1954-07-20 | Paul A Medearis | Power elevator for oil wells |
| US2975650A (en) * | 1959-06-23 | 1961-03-21 | Sperry Rand Corp | Engine control means |
| FR2104690B1 (en) * | 1970-07-24 | 1974-03-01 | Tractel Sa | |
| US3750970A (en) * | 1971-02-02 | 1973-08-07 | Marine Constr & Design Co | Line coiling apparatus |
| FR2146654A5 (en) * | 1971-07-22 | 1973-03-02 | Rocla Concrete Pipes Ltd | |
| US3717325A (en) * | 1971-08-02 | 1973-02-20 | American Chain & Cable Co | Cable system |
| US3729173A (en) * | 1972-01-24 | 1973-04-24 | Tractel Sa | Endless jaw chain self-clamping winch |
| DE2307370C3 (en) * | 1973-02-15 | 1979-03-29 | Carl 5291 Kupferberg Kaeufer | Cable winch, especially for hanging scaffolding |
| FR2233269A1 (en) * | 1973-06-15 | 1975-01-10 | Lacour Jean | Lifting device with motor-driven pulley - pivots to press free end of rope between pulley and auxiliary roller |
| US4005852A (en) * | 1975-06-27 | 1977-02-01 | The United States Of America As Represented By The Secretary Of The Air Force | Traction sheave warning for helicopter rescue hoist systems |
| US4113237A (en) * | 1975-10-28 | 1978-09-12 | D. G. Beyer, Inc. | Cable tension control |
| DE2717157C2 (en) * | 1977-04-19 | 1979-05-17 | Ludwig Hofmann, Ludhof-Technik, 7580 Buehl | Belt or rope ratchet |
| GB2016646B (en) * | 1978-03-16 | 1982-07-14 | Secr Defence | Belt and friction drive mechanism |
| US4193314A (en) * | 1978-03-22 | 1980-03-18 | General Motors Corporation | Timing chain snubber |
| FR2457834A1 (en) * | 1979-06-01 | 1980-12-26 | Tractel Sa | DEVICE FOR PRESSING A CABLE AGAINST THE GROOVE OF A PULLEY |
| FR2434111A1 (en) * | 1978-08-22 | 1980-03-21 | Tractel Sa | PULLEY SYSTEM IMPROVING THE COOPERATION OF A WINCH WITH THE CABLE IT OPERATES |
| GB2061861B (en) * | 1979-10-25 | 1983-05-05 | Aabacas Eng Co Ltd | Rope guides for hoists |
| FR2599731A1 (en) * | 1986-06-04 | 1987-12-11 | Mannesmann Ag | CABLE FIXING |
| FR2618421B1 (en) * | 1987-07-21 | 1990-01-05 | Cavalieri Michel | SAFETY ASSEMBLY FOR FLYING SCAFFOLD WINCH |
| JPS6476797A (en) * | 1987-09-18 | 1989-03-22 | Hitachi Ltd | Manufacture of superconducting thin-film multi-layer board |
| FR2638802B2 (en) * | 1988-06-03 | 1995-02-24 | Secalt Sa | APPARATUS FOR DRIVING A FLEXIBLE LINK SUCH AS A STRAP OR BELT |
| FR2632622B2 (en) * | 1988-05-18 | 1994-10-14 | Secalt | SELF-TIGHTENING WINCH FOR THE STRAPPING OF A STRAP |
| CH673274A5 (en) * | 1989-07-17 | 1990-02-28 | Kyburz Maschinenbau Ag | Rope winch with rotary drum - has driven pulley in contact with rope winding on and off drum |
-
1989
- 1989-05-29 FR FR8907015A patent/FR2647427B1/en not_active Expired - Lifetime
-
1990
- 1990-05-28 DD DD90341058A patent/DD295605A5/en unknown
- 1990-05-28 EP EP90401406A patent/EP0401099B1/en not_active Expired - Lifetime
- 1990-05-28 DE DE90401406T patent/DE69004007D1/en not_active Expired - Lifetime
- 1990-05-29 US US07/529,360 patent/US5129626A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| FR2647427A1 (en) | 1990-11-30 |
| EP0401099A1 (en) | 1990-12-05 |
| US5129626A (en) | 1992-07-14 |
| DD295605A5 (en) | 1991-11-07 |
| FR2647427B1 (en) | 1991-09-06 |
| DE69004007D1 (en) | 1993-11-25 |
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