EP0343063B1 - Winch for driving a strap - Google Patents
Winch for driving a strap Download PDFInfo
- Publication number
- EP0343063B1 EP0343063B1 EP19890401356 EP89401356A EP0343063B1 EP 0343063 B1 EP0343063 B1 EP 0343063B1 EP 19890401356 EP19890401356 EP 19890401356 EP 89401356 A EP89401356 A EP 89401356A EP 0343063 B1 EP0343063 B1 EP 0343063B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulley
- profile
- belt
- rollers
- flat
- Prior art date
- 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.)
- Expired - Lifetime
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Classifications
-
- 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 present invention relates to an apparatus for driving a flat flexible link, such as a strap or a belt, to which a load is attached.
- Apparatuses comprising a drive pulley device, moved manually or mechanically, which scrolls a cable without storing it.
- this device the tightening of the cable in the groove of the pulley is exerted by the pressure of a pivoting member, a roller or a series of rollers for example, this pressure being applied either by the effect of springs, or by the effect of deflection exerted by the load.
- a pivoting member a roller or a series of rollers for example, this pressure being applied either by the effect of springs, or by the effect of deflection exerted by the load.
- patent FR-A-1 389 136 describes a traction device allowing the lifting and lowering of a load.
- This device comprises a pulley driven in rotation, a cable which runs on the periphery of this pulley and to one strand of which the load is fixed, and a chain of pressure rollers which is constrained, under the effect of the load, to press the cable on the peripheral surface of the pulley.
- the peripheral groove of the pulley has a cross section in V to receive the cable which is pressed by the rollers of the chain.
- the object of the present invention is to remedy to this drawback and proposes for this purpose a drive device which is constituted by the combination of a pulley, clamping and guiding members, and a flexible flat link to which the load, the pulley and the clamping and guiding members being designed to allow the driving of such a flexible flat link, strap or flat belt for example, taking into account the constraints specific to the use of such a link, constraints different from those encountered for driving a round section link, such as a cable, in particular less flexible than a flat link and, in particular, a strap.
- the invention applies to the different possible embodiments of known devices, according to the two main methods of tightening the cable in the pulley groove, that is to say constant pressure by springs and pressure by return of a deflection of the load.
- the pressure of the flexible link against the peripheral surface of the pulley can be applied by a single pressing member or by a series of pressing members arranged at the periphery of the pulley.
- these can be actuated either by separate springs applied respectively to each of them, or by a force applied at a single point, itself transmitted to said pressing members or by a bogie system , or by a connection between said pressing members by means of a series of links forming a chain with these pressing members.
- a separate spring or springs for each pressing member can be combined with a deflection action, said spring or said springs then playing a permanent pre-tightening role.
- the action of the springs can be replaced by an elastic deformation of the surface peripheral of the pulley and / or of a pressing member whose axis is then fixed.
- means can be provided for retracting the axis of the pressing member during the introduction of the flexible link.
- said chain is subjected to tensile stress, at its end situated on the side of the soft strand of the link, from a deflection member disposed on the path of the strand charged with the link, and in a direction forming an angle at most of 90 ° with the radius of the pulley passing through the end point of said chain to which this traction applies.
- the arrangement of the pressing member or pressing members is arranged so that the winding arc of the link on the pulley covers the greatest possible radial angle.
- the drive system can also be designed for winding the link along an S-shaped path around two pulleys, the pulley of which is located downstream from the load and is fitted with the pressure and guidance devices mentioned above.
- the device for driving a load comprises a pulley driven in rotation, a flexible link running on the periphery of said pulley and to one strand of which the load is fixed, and constrained means for pressing the link on the peripheral surface of the pulley, said means being mainly constituted by at least one roller and the peripheral surface of the pulley being profiled to receive the winding of such a link by cooperating with a counter-profile, and it is characterized in that the link is flat and in that the counter-profile corresponds to the profile of the peripheral surface of the pulley and belongs to the peripheral surface of the pressure roller (s).
- the peripheral profile of the pulley can thus be flat with lateral guide flanges, or concave in an elliptical shape or a very flat V shape with a flat bottom or bottom formed by an arc tangent to the two branches of the V, or conversely be convex in one of the forms mentioned above for the concave profile.
- the peripheral profile of the pressure member (s) being the counter-profile which corresponds to the peripheral profile of the pulley, so as to ensure correct cooperation of the pulley, the flat link and the pressing member.
- peripheral surfaces of the pulley and / or of the pressing member (s) may be coated with a substance chosen to improve their adhesion to one and / or the other of the two flat surfaces of the link, depending on the material of which it is made. this. Furthermore, the peripheral surface of the pulley and / or of the pressing member or of the pressing members may include a system of roughness such as knurling.
- the configuration and flexibility of the flat link require the fitting of appropriate guiding means in order to ensure a course correct soft strand of this link during the upward movement or traction of the load, and especially in order to avoid its untimely winding around the pulley training outside its normal course. Similarly on the side of the strand loaded with the link, if the load ceases to apply to it.
- the invention provides a guide which covers the peripheral part of the pulley not covered by the winding of the flexible link, at least on the side where the soft strand must leave the peripheral surface of the pulley, so that the strand leaving this surface is thus deviated out of the circular path that the pulley tends, by its movement, to impress on it.
- the guide has a curved face conforming to the shape of the periphery of the pulley on its part not covered by the winding of the link and extending from one point to the other of the two points of insertion of the link. on the pulley.
- the curved face of the guide can be extended, at each of its ends, by a lateral face arranged to orient the movement of the link so as to print the desired path inside the device.
- a fourth face can join the ends of the two preceding ones according to an appropriate conformation, and the guide thus formed can be constituted either by a full or partially full piece, or by a plate folded in a suitable way.
- the guide can be held in place in a position of extreme proximity to the pulley arch that it covers, and it then has a curvature concentric with that of the pulley.
- the guide can also be applied in contact with the pulley, by a spring acting on the face of the guide located opposite the pulley and whose action can be adjusted.
- the curvature of this face is of a radius substantially less than that of the pulley, so that only its two ends are in frictional contact with the pulley.
- Complementary devices can guide the movement of the guide under the effect adjustment of the above spring, this adjustment being able, if necessary, to remove the contact between the guide and the pulley.
- the face of the guide located opposite the pulley can be made of an elastic material ensuring flexibility of this face under the action of the spring mentioned above.
- a pair of rollers whose axes are parallel to that of the pulley, can be associated, outside the pulley, with the soft strand of the link as well as, optionally , to the load carrying strand in case it ceases to apply to this strand.
- Each of these pairs can be completed by a pair of rollers located in their vicinity, whose axes are perpendicular to those of each pair above, so as to frame the faces of the flat link delimiting the thickness thereof.
- a simplified embodiment of this device only one of the rollers of the pair or pairs of rollers concerned is thus motorized, while the other roller is applied against the link by an adequate pressure means, so as to maintain contact constant between the link and the motorized roller.
- the soft strand of the link can be recovered by a winding system incorporated in the device and provided with a spring system which constantly urges it in the winding direction, regardless of the direction of rotation of said winding system.
- this arrangement does not make it possible to maintain the tension of the strand loaded in the event of the suppression of the application of the load in the direction of descent.
- FIG. 1 and 2 there is shown an apparatus comprising a pulley 1 fixed in its center on a drive shaft 2.
- the peripheral part 3 of the pulley 1 is made of a synthetic material with high coefficient of friction and present towards the outside a flat profile on which a strap 4 is applied.
- the strap 4 cooperates with the pulley 1 over the major part of the peripheral part 3 of the latter and, to one of its strands 5 is coupled the load (not shown in the drawing) to haul or haul, while its other strand 6 is free.
- the tightening of the strap 4 on the periphery of the pulley 1 is ensured by means of a pressure roller 7 mounted idly at one end of a lever 8 whose other end is pivotally mounted around a fixed point 9.
- a compression spring 1O resting on a fixed structural element 11, applies the pressure roller 7 against the periphery of the pulley by tightening the strap 4 on the side of the free strand 6 thereof.
- the profile of the pressure roller 7 corresponds to that of the periphery of the pulley 1, that is to say is flat to ensure the tightening of the strap 4 over the entire transverse part of that -this.
- the arrangement of the lever 8 is chosen so that the part of the periphery of the pulley 1 with which cooperates the strap 4 is as large as possible in order to optimize the adhesion of the strap on the pulley.
- FIG. 3 there is shown another embodiment of the apparatus according to the invention, according to which the tightening of the strap 14 on the periphery of the pulley 12, fixed on the shaft 13, is provided by a plurality of independent rollers 24 arranged all around the pulley in radial directions.
- Each roller 24 is mounted idly on a yoke 25 constrained by a spring 26, resting on a casing 27, in the direction of the pulley.
- the load can be applied indifferently to one or the other of the two strands 15, 16 of the strap 14.
- a winch comprising a drive shaft 31 which passes through the central opening 32 of a yoke 33 consisting of two flanges 34,35 assembled one to the other by means of bolts 36 and spacers 37.
- a pulley 38 On the shaft 31 is fixed a pulley 38 whose periphery 39 is made of a synthetic material with a high coefficient of friction.
- the peripheral part 39 of the pulley 38 Towards the outside, the peripheral part 39 of the pulley 38 has in section a very open V-shaped profile designed for good cooperation with the intermediate part of a strap 40 which is wound around the pulley.
- the load (not shown in the drawing) to haul or to haul, while the other strand 42 of the strap is free.
- the tightening of the strap 40 on the periphery of the pulley 38 is ensured by a link chain consisting of a succession of links 43 interconnected by axes 44, each axis 44 carrying a roller 45 having a V-shaped profile combined with that of the peripheral part 39 of the pulley 38.
- a terminal link 43 ′ disposed on the side of the loaded strand 41 of the strap, is fixed to the yoke of the pulley by means of an axis 46.
- On this axis 46 is articulated one end of a link 47 whose end opposite carries the axis of a deflector roller 48 over which the loaded strand 41 of the strap passes.
- the other end link 43 "of the chain is connected by its axis 44" to one end of a connecting rod 49 whose opposite end is articulated on an axis 5O secured to the yoke.
- the connecting rod 49 has axially a plurality of openings 51 allowing selectively, by means of an axis 52, the adjustable articulated fixing of one end of a connecting rod 53 whose other end is articulated on the axis of the roller deflector 48.
- the successive links 57 constituting the chain are interconnected by axes 58 each carrying a pressure roller 59.
- the axis 58 ′ carrying the last pressure roller 59 ′ is connected to a fixed point .
- the position of the latter is determined so as to maintain at least the roller 59 ′ in contact with the strap 54.
- the last link 57 is connected to the axis of the roller 61 mounted at the end of a lever 62 pivoting about a fixed axis 63.
- a spring 64 resting on a fixed point 65 constrains the lever 62 towards its position pressing the chain against the periphery of the pulley.
- Figure 7 there is shown the periphery 69 of the pulley 68 of an apparatus according to the invention, with a concave curvature groove 71 of elliptical shape, the pressure roller 72 tightening the strap 7O in the groove having an exactly complementary profile .
- the concave shape of the groove profile can of course be different, for example circular.
- the profile shown of the groove of the pulley 73 has a flat bottom 74 receiving the roller 75.
- the profile of the periphery 76 of the pulley 77 has the shape of a V with a large opening 78 the bottom of which is constituted by an arc tangent to the two branches of the V.
- the profile of the groove of the pulley 79 has the shape of a V with a large opening 8O, the bottom of which is flat.
- the groove profile 81 of the pulley 82 has a circular convex shape, but it is understood that this convex shape could be elliptical.
- the groove profile 83 of the pulley 84 has a convex inverted V shape with a very large opening, the top of which is flattened. It is understood, however, that the top could be tapered or even arched.
- the deflection guide 98 is constituted by a folded metal plate having an arcuate upper face 99 of the same radius of curvature as that of the pulley 91.
- the face 99 of the guide 98 is intended to follow the shape of the periphery of the pulley 91 on its part not covered by the winding of the strap 92 and extends from one to the other of the two points of insertion of the strap 92 on the pulley.
- Two side faces 1OO extend the arcuate face 99 and each guide the desired path of the strap 92 inside the device.
- the ends of the faces 1OO are joined by a lower face 1O1 resting on the supports 1O2 secured to the casing of the apparatus, so that the arched face 99 is held in place in the position of extreme proximity to the arch of the pulley 91 that it covers.
- FIG 15 there is shown a variant of the apparatus of Figure 14 with a different deflection device 1O4 comprising an arcuate face 1O5 made of an elastic material and which has a radius of curvature substantially less than that of the pulley 1O6.
- the ends of the arcuate face 1O5 are applied in friction to the periphery of the pulley 1O6 under the action of a spring 1O7 acting in the direction of the axis of symmetry of the face 1O5.
- the spring 10 7 rests on a fixed point 10 8 secured to the casing of the device by means of a device 10 9 which makes it possible to locate and adjust the compression of the spring.
- the loaded strand 110 and the soft strand 111 of the strap 112 each pass between two rollers 113,114 with axes parallel to the axis of the pulley 1O6.
- the rollers 113 are driven in rotation, by the pulley 1O6, by means of a belt 115, with a peripheral linear speed of rotation which is equal to the linear speed imparted by the pulley 1O6 to the strap 112.
- the rollers 114 are at free rotation and press the strap 112 against the rollers 113 under the action of springs 116.
- the strand of the strap 112 exiting the pulley 1O6 is driven by the rollers 113,114 at the same speed of rotation as that of the pulley 1O6, which prevents the accidental formation of a loop of this strand capable of being able to engage between the pulley and the strand of the strap 112 returning thereto.
- the roller system 113,114 is replaced, on the side of the soft strand 97 of the strap 92, by a winding drum 118 of this strand 97 provided with a spring 119 urging it constantly in the direction of winding (direction of arrow A) whatever the direction of rotation of the drum 118.
- each pair of rollers 113,114 is associated with a pair of rollers 120, 121 oriented perpendicularly to these to frame the strap and mounted in free rotation.
- the association of motorized rollers 113,114 and rollers 12O, 121 applies a tension on the strap strand with which these rollers cooperate, making it possible to prevent the strap strand from coming into wedge because of its flexibility.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Basic Packing Technique (AREA)
Description
La présente invention concerne un appareil réalisant l'entraînement d'un lien souple plat, tel qu'une sangle ou une courroie, auquel est attachée une charge.The present invention relates to an apparatus for driving a flat flexible link, such as a strap or a belt, to which a load is attached.
On connaît des appareils comprenant un dispositif de poulie d'entraînement, mue manuellement ou mécaniquement, qui fait défiler un câble sans l'emmagasiner. Dans ce dispositif, le serrage du câble dans la gorge de la poulie est exercé par la pression d'un organe pivotant, un galet ou une série de galets par exemple, cette pression étant appliquée soit par l'effet de ressorts, soit par l'effet d'une déflexion exercée par la charge. De tels appareils sont décrits par exemple dans les brevets français N° 1 121 O39 et N° 1 389 136.Apparatuses are known comprising a drive pulley device, moved manually or mechanically, which scrolls a cable without storing it. In this device, the tightening of the cable in the groove of the pulley is exerted by the pressure of a pivoting member, a roller or a series of rollers for example, this pressure being applied either by the effect of springs, or by the effect of deflection exerted by the load. Such devices are described for example in French patents No. 1,121,039 and No. 1,389,136.
Ainsi le brevet FR-A-1 389 136 décrit un appareil de traction permettant le levage et la descente d'une charge. Cet appareil comprend une poulie entraînée en rotation, un câble qui défile sur la périphérie de cette poulie et à un brin duquel est fixée la charge, et une chaîne de galets presseurs qui est contrainte, sous l'effet de la charge, pour presser le câble sur la surface périphérique de la poulie. La gorge périphérique de la poulie présente une section transversale en V pour recevoir le câble qui est pressé par les galets de la chaîne.Thus patent FR-A-1 389 136 describes a traction device allowing the lifting and lowering of a load. This device comprises a pulley driven in rotation, a cable which runs on the periphery of this pulley and to one strand of which the load is fixed, and a chain of pressure rollers which is constrained, under the effect of the load, to press the cable on the peripheral surface of the pulley. The peripheral groove of the pulley has a cross section in V to receive the cable which is pressed by the rollers of the chain.
Les dispositifs connus mentionnés ci-dessus présentent toutefois l'inconvénient de ne pas permettre l'utilisation d'un lien plat, et particulièrement d'un lien plat souple tel qu'une sangle ou une courroie plate, comme moyen de liaison avec la charge.The known devices mentioned above however have the disadvantage of not allowing the use of a flat link, and in particular a flexible flat link such as a strap or a flat belt, as a means of connection with the load. .
La présente invention a pour objet de remédier à cet inconvénient et propose à cet effet un dispositif d'entraînement qui est constitué par la combinaison d'une poulie, d'organes de serrage et de guidage, et d'un lien plat souple auquel est fixée la charge, la poulie et les organes de serrage et de guidage étant conçus pour permettre l'entraînement d'un tel lien plat souple, sangle ou courroie plate par exemple, en tenant compte des contraintes propres à l'utilisation d'un tel lien, contraintes différentes de celles rencontrées pour l'entraînement d'un lien de section ronde, tel qu'un câble, notamment moins souple qu'un lien plat et, particulièrement, qu'une sangle.The object of the present invention is to remedy to this drawback and proposes for this purpose a drive device which is constituted by the combination of a pulley, clamping and guiding members, and a flexible flat link to which the load, the pulley and the clamping and guiding members being designed to allow the driving of such a flexible flat link, strap or flat belt for example, taking into account the constraints specific to the use of such a link, constraints different from those encountered for driving a round section link, such as a cable, in particular less flexible than a flat link and, in particular, a strap.
L'invention s'applique aux différentes variantes de réalisation possibles des dispositifs connus, selon les deux modes principaux de serrage du câble dans la gorge de poulie, c'est-à-dire pression constante par des ressorts et pression par renvoi d'une déflexion de la charge.The invention applies to the different possible embodiments of known devices, according to the two main methods of tightening the cable in the pulley groove, that is to say constant pressure by springs and pressure by return of a deflection of the load.
Dans chacun de ces deux modes la pression du lien souple contre la surface périphérique de la poulie peut être appliquée par un organe presseur unique ou par une série d'organes presseurs disposés à la périphérie de la poulie. Dans le cas de plusieurs organes presseurs, ceux-ci peuvent être actionnés soit par des ressorts distincts appliqués respectivement à chacun d'eux, soit par une force appliquée en un point unique, elle-même transmise auxdits organes presseurs soit par un système de boggies, soit par une liaison entre lesdits organes presseurs au moyen d'une suite de maillons formant une chaîne avec ces organes presseurs.In each of these two modes the pressure of the flexible link against the peripheral surface of the pulley can be applied by a single pressing member or by a series of pressing members arranged at the periphery of the pulley. In the case of several pressing members, these can be actuated either by separate springs applied respectively to each of them, or by a force applied at a single point, itself transmitted to said pressing members or by a bogie system , or by a connection between said pressing members by means of a series of links forming a chain with these pressing members.
L'action d'un ressort ou de ressorts distincts pour chaque organe presseur peut être combiné à une action de déflexion, ledit ressort ou lesdits ressorts jouant alors un rôle de préserrage permanent. Alternativement, l'action des ressorts peut être remplacée par une déformation élastique de la surface périphérique de la poulie et/ou d'un organe presseur dont l'axe est alors fixe. Dans ce dernier cas, des moyens peuvent être prévus pour l'escamotage de l'axe de l'organe presseur lors de l'introduction du lien souple.The action of a separate spring or springs for each pressing member can be combined with a deflection action, said spring or said springs then playing a permanent pre-tightening role. Alternatively, the action of the springs can be replaced by an elastic deformation of the surface peripheral of the pulley and / or of a pressing member whose axis is then fixed. In the latter case, means can be provided for retracting the axis of the pressing member during the introduction of the flexible link.
Dans le cas d'une liaison par chaîne des organes presseurs, ladite chaîne est sollicitée en traction, à son extrémité située du côté du brin mou du lien, à partir d'un organe de déflexion disposé sur le parcours du brin chargé du lien, et suivant une direction formant un angle au plus de 9O° avec le rayon de la poulie passant par le point d'extrémité de ladite chaîne auquel s'applique cette traction.In the case of a chain connection of the pressing members, said chain is subjected to tensile stress, at its end situated on the side of the soft strand of the link, from a deflection member disposed on the path of the strand charged with the link, and in a direction forming an angle at most of 90 ° with the radius of the pulley passing through the end point of said chain to which this traction applies.
Que l'on soit en présence d'un organe presseur unique ou d'une suite d'organes presseurs agissant sous l'effet d'une déflexion de la charge, ces organes reçoivent ledit effet à partir d'un organe de déflexion par l'intermédiaire d'une bielle ou d'un jeu de leviers réglable ou non.Whether one is in the presence of a single pressing member or a series of pressing members acting under the effect of a deflection of the load, these organs receive said effect from a deflection member by the 'via a connecting rod or a set of levers adjustable or not.
Quelle que soit la forme de réalisation, la disposition de l'organe presseur ou des organes presseurs est aménagée de façon que l'arc d'enroulement du lien sur la poulie couvre un angle radial le plus grand possible.Whatever the embodiment, the arrangement of the pressing member or pressing members is arranged so that the winding arc of the link on the pulley covers the greatest possible radial angle.
Le système d'entraînement peut aussi être conçu pour l'enroulement du lien suivant un parcours en S autour de deux poulies dont la poulie située en aval par rapport à la charge est munie des dispositifs de pression et de guidage mentionnés ci-dessus.The drive system can also be designed for winding the link along an S-shaped path around two pulleys, the pulley of which is located downstream from the load and is fitted with the pressure and guidance devices mentioned above.
Selon l'invention le dispositif d'entraînement d'une charge comprend une poulie entraînée en rotation, un lien souple défilant sur la périphérie de ladite poulie et à un brin duquel est fixée la charge, et des moyens contraints pour presser le lien sur la surface périphérique de la poulie, lesdits moyens étant constitués principalement par au moins un galet et la surface périphérique de la poulie étant profilée pour recevoir l'enroulement d'un tel lien en coopérant avec un contre-profil, et il se caractérise en ce que le lien est plat et en ce que le contre-profil correspond au profil de la surface périphérique de la poulie et appartient à la surface périphérique du ou des galets presseurs.According to the invention the device for driving a load comprises a pulley driven in rotation, a flexible link running on the periphery of said pulley and to one strand of which the load is fixed, and constrained means for pressing the link on the peripheral surface of the pulley, said means being mainly constituted by at least one roller and the peripheral surface of the pulley being profiled to receive the winding of such a link by cooperating with a counter-profile, and it is characterized in that the link is flat and in that the counter-profile corresponds to the profile of the peripheral surface of the pulley and belongs to the peripheral surface of the pressure roller (s).
Le profil périphérique de la poulie peut ainsi être plat avec des flasques latéraux de guidage, ou bien concave suivant une forme elliptique ou une forme en V très aplati à fond plat ou à fond constitué par un arc tangent aux deux branches du V, ou bien inversement être convexe suivant l'une des formes mentionnées ci-dessus pour le profil concave. Dans chaque cas, le profil périphérique du ou des organes de pression étant le contre-profil qui correspond au profil périphérique de la poulie, de façon à assurer une coopération correcte de la poulie, du lien plat et de l'organe presseur.The peripheral profile of the pulley can thus be flat with lateral guide flanges, or concave in an elliptical shape or a very flat V shape with a flat bottom or bottom formed by an arc tangent to the two branches of the V, or conversely be convex in one of the forms mentioned above for the concave profile. In each case, the peripheral profile of the pressure member (s) being the counter-profile which corresponds to the peripheral profile of the pulley, so as to ensure correct cooperation of the pulley, the flat link and the pressing member.
Les surfaces périphériques de la poulie et/ou du ou des organes presseurs peuvent être revêtues d'une substance choisie pour améliorer leur adhérence sur l'une et/ou l'autre des deux surfaces plates du lien, selon la matière constitutive de celui-ci. Par ailleurs, la surface périphérique de la poulie et/ou de l'organe presseur ou des organes presseurs peut comporter un système d'aspérités tel qu'un moletage.The peripheral surfaces of the pulley and / or of the pressing member (s) may be coated with a substance chosen to improve their adhesion to one and / or the other of the two flat surfaces of the link, depending on the material of which it is made. this. Furthermore, the peripheral surface of the pulley and / or of the pressing member or of the pressing members may include a system of roughness such as knurling.
L'effet des organes de pression, ainsi profilés et aménagés, est engendré, comme on l'a exposé ci-avant, soit par des ressorts, soit par une liaison de déflexion transmettant l'action de la charge du côté du brin non chargé du lien à partir d'un organe déflecteur disposé sur le trajet du brin chargé.The effect of the pressure members, thus profiled and arranged, is generated, as explained above, either by springs or by a deflection link transmitting the action of the load from the side of the unloaded strand of the link from a deflector member disposed on the path of the loaded strand.
Quelque soit le mode d'action exercé sur le ou les organes pressant le lien sur la surface périphérique de la poulie d'entraînement, la configuration et la souplesse du lien plat exigent l'aménagement de moyens de guidage appropriés afin d'assurer un déroulement correct du brin mou de ce lien lors du mouvement de montée ou traction de la charge, et spécialement afin d'éviter son enroulement intempestif autour de la poulie d'entraînement hors de son parcours normal. De même du côté du brin chargé du lien, si la charge vient à cesser de s'y appliquer. A cet effet, l'invention prévoit une guide qui couvre la partie périphérique de la poulie non couverte par l'enroulement du lien souple, au moins du côté où le brin mou doit quitter la surface périphérique de la poulie, de façon que le brin quittant cette surface se trouve ainsi dévié hors du trajet circulaire que la poulie tend, par son mouvement, à lui imprimer.Whatever the mode of action exerted on the member (s) pressing the link on the peripheral surface of the drive pulley, the configuration and flexibility of the flat link require the fitting of appropriate guiding means in order to ensure a course correct soft strand of this link during the upward movement or traction of the load, and especially in order to avoid its untimely winding around the pulley training outside its normal course. Similarly on the side of the strand loaded with the link, if the load ceases to apply to it. To this end, the invention provides a guide which covers the peripheral part of the pulley not covered by the winding of the flexible link, at least on the side where the soft strand must leave the peripheral surface of the pulley, so that the strand leaving this surface is thus deviated out of the circular path that the pulley tends, by its movement, to impress on it.
A cet effet, le guide comporte une face courbe épousant la forme de la périphérie de la poulie sur sa partie non couverte par l'enroulement du lien et s'étendant d'un point à l'autre des deux points d'insertion du lien sur la poulie. La face courbe du guide peut être prolongée, à chacune de ses extrémités, par une face latérale disposée pour orienter le défilement du lien de façon à lui imprimer le parcours souhaité à l'intérieur de l'appareil. Une quatrième face peut joindre les extrémités des deux précédentes suivant une conformation appropriée, et le guide ainsi formé peut être constitué soit par une pièce pleine ou partiellement pleine, soit par une plaque pliée de façon adéquate.To this end, the guide has a curved face conforming to the shape of the periphery of the pulley on its part not covered by the winding of the link and extending from one point to the other of the two points of insertion of the link. on the pulley. The curved face of the guide can be extended, at each of its ends, by a lateral face arranged to orient the movement of the link so as to print the desired path inside the device. A fourth face can join the ends of the two preceding ones according to an appropriate conformation, and the guide thus formed can be constituted either by a full or partially full piece, or by a plate folded in a suitable way.
Le guide peut être maintenu en place en position d'extrême proximité de l'arc de poulie qu'il recouvre, et il présente alors une courbure concentrique à celle de la poulie.The guide can be held in place in a position of extreme proximity to the pulley arch that it covers, and it then has a curvature concentric with that of the pulley.
Le guide peut aussi être appliqué en contact avec la poulie, par un ressort agissant sur la face du guide située en regard de la poulie et dont l'action peut être réglée. Dans ce cas, la courbure de cette face est d'un rayon sensiblement inférieur à celui de la poulie, de façon que seules ses deux extrémités soient en contact de friction avec la poulie.The guide can also be applied in contact with the pulley, by a spring acting on the face of the guide located opposite the pulley and whose action can be adjusted. In this case, the curvature of this face is of a radius substantially less than that of the pulley, so that only its two ends are in frictional contact with the pulley.
Des dispositifs complémentaires peuvent assurer un guidage du déplacement du guide sous l'effet du réglage du ressort ci-dessus, ce réglage pouvant, le cas échéant, permettre de supprimer le contact entre le guide et la poulie.Complementary devices can guide the movement of the guide under the effect adjustment of the above spring, this adjustment being able, if necessary, to remove the contact between the guide and the pulley.
Suivant un mode particulier de réalisation, la face du guide située en regard de la poulie peut être constituée en une matière élastique assurant une flexibilité de cette face sous l'action du ressort mentionné ci-dessus.According to a particular embodiment, the face of the guide located opposite the pulley can be made of an elastic material ensuring flexibility of this face under the action of the spring mentioned above.
De façon alternative ou complémentaire à l'action de ce guide, une paire de galets, dont les axes sont parallèles à celui de la poulie, peut être associée, à l'extérieur de la poulie, au brin mou du lien ainsi que, éventuellement, au brin porteur de la charge pour le cas où elle-ci cesserait de s'appliquer à ce brin. Chacune de ces paires peut être complétée par une paire de galet situés à leur voisinage, dont les axes sont perpendiculaires à ceux de chaque paire ci-dessus, de façon à encadrer les faces du lien plat délimitant l'épaisseur de celui-ci.As an alternative or complementary to the action of this guide, a pair of rollers, whose axes are parallel to that of the pulley, can be associated, outside the pulley, with the soft strand of the link as well as, optionally , to the load carrying strand in case it ceases to apply to this strand. Each of these pairs can be completed by a pair of rollers located in their vicinity, whose axes are perpendicular to those of each pair above, so as to frame the faces of the flat link delimiting the thickness thereof.
Suivant un mode de réalisation amélioré d'un tel système, un dispositif de transmission de la rotation de la poulie, s'appliquant aux galets dont l'axe est parallèle à celui de la poulie, entraîne ces galets en rotation suivant un sens et une vitesse périphérique linéaire qui sont identiques à ceux imprimés au lien par la rotation de la poulie. Selon une réalisation simplifiée de ce dispositif, l'un seulement des galets de la ou des paires de galets concernées est ainsi motorisé, cependant que l'autre galet est appliqué contre le lien par un moyen de pression adéquat, de façon à maintenir un contact constant entre le lien et le galet ainsi motorisé.According to an improved embodiment of such a system, a device for transmitting the rotation of the pulley, applying to the rollers whose axis is parallel to that of the pulley, drives these rollers in rotation in a direction and a linear peripheral speed which are identical to those printed on the link by the rotation of the pulley. According to a simplified embodiment of this device, only one of the rollers of the pair or pairs of rollers concerned is thus motorized, while the other roller is applied against the link by an adequate pressure means, so as to maintain contact constant between the link and the motorized roller.
Selon une variante, le brin mou du lien peut être récupéré par un système d'enroulement incorporé à l'appareil et muni d'un système de ressort le sollicitant constamment dans le sens de l'enroulement, quel que soit le sens de rotation dudit système d'enroulement. Toutefois, cette disposition ne permet pas de maintenir la tension du brin chargé en cas de suppression de l'application de la charge dans le sens de la descente.According to a variant, the soft strand of the link can be recovered by a winding system incorporated in the device and provided with a spring system which constantly urges it in the winding direction, regardless of the direction of rotation of said winding system. However, this arrangement does not make it possible to maintain the tension of the strand loaded in the event of the suppression of the application of the load in the direction of descent.
Pour bien faire comprendre le dispositif selon l'invention on en décrira ci-après, à titre d'exemples sans caractère limitatif, plusieurs formes d'exécution préférées en référence au dessin schématique annexé dans lequel :
- la figure 1 est une vue en élévation d'une première forme d'exécution d'un appareil selon l'invention pour l'entraînement d'une sangle comprenant un galet presseur monté sur un levier contraint par ressort et pivotant autour d'un point fixe ;
- la figure 2 est une vue en coupe verticale de l'appareil de la figure 1 ;
- la figure 3 est une vue en élévation d'une seconde forme d'exécution d'un appareil selon l'invention, utilisant une pluralité de galets presseurs indépendants ;
- la figure 4 est une vue en élévation de face d'un treuil auto-serreur à défilement de sangle constituant une troisième forme d'exécution du dispositif selon l'invention ;
- la figure 5 est une vue en coupe verticale de la poulie du treuil de la figure 4 ;
- la figure 6 est une vue en élévation d'une quatrième forme d'exécution d'un appareil d'entraînement pour sangle selon l'invention ;
- les figures 7 à 12 sont des vues en coupe verticale partielle qui montrent divers profils avantageux pouvant être présentés par la gorge de poulie d'un appareil selon l'invention et par les galets de serrage coopérant avec elle ;
- la figure 13 est une variante de l'appareil de la figure 1, comportant une deuxième poulie ;
- la figure 14 est une vue en élévation, partiellement en coupe, d'une cinquième forme d'exécution d'un appareil selon l'invention, équipé d'un dispositif de guidage ;
- la figure 15 est une vue d'un appareil du même genre que celui de la figure 14, mais comportant un dispositif de guidage différente ; et
- la figure 16 montre une variante du dispositif de la figure 15.
- Figure 1 is an elevational view of a first embodiment of an apparatus according to the invention for driving a strap comprising a pressure roller mounted on a lever constrained by spring and pivoting around a point fixed;
- Figure 2 is a vertical sectional view of the apparatus of Figure 1;
- Figure 3 is an elevational view of a second embodiment of an apparatus according to the invention, using a plurality of independent pressure rollers;
- Figure 4 is a front elevational view of a self-locking winch with strap running constituting a third embodiment of the device according to the invention;
- Figure 5 is a vertical sectional view of the winch pulley of Figure 4;
- Figure 6 is an elevational view of a fourth embodiment of a strap training apparatus according to the invention;
- Figures 7 to 12 are views in partial vertical section which show various advantageous profiles which can be presented by the pulley groove of an apparatus according to the invention and by the clamping rollers cooperating with it;
- Figure 13 is a variant of the apparatus of Figure 1, comprising a second pulley;
- Figure 14 is an elevational view, partially in section, of a fifth embodiment of an apparatus according to the invention, equipped with a guide device;
- Figure 15 is a view of an apparatus of the same kind as that of Figure 14, but having a different guide device; and
- FIG. 16 shows a variant of the device in FIG. 15.
En référence aux figures 1 et 2 on a représenté un appareil comprenant une poulie 1 fixée en son centre sur un arbre d'entraînement 2. La partie périphérique 3 de la poulie 1 est réalisée en une matière synthétique à fort coefficient de friction et présente vers l'extérieur un profil plat sur lequel s'applique une sangle 4. La sangle 4 coopère avec la poulie 1 sur la plus grande partie de la partie périphérique 3 de celle-ci et, à l'un de ses brins 5 est attelée la charge (non représentée au dessin) à haler ou déhaler, alors que son autre brin 6 est libre.Referring to Figures 1 and 2 there is shown an apparatus comprising a pulley 1 fixed in its center on a
Le serrage de la sangle 4 sur la périphérie de la poulie 1 est assuré au moyen d'un galet presseur 7 monté fou à une extrémité d'un levier 8 dont l'autre extrémité est montée pivotante autour d'un point fixe 9. Un ressort de compression 1O, s'appuyant sur un élément de structure fixe 11, applique le galet presseur 7 contre la périphérie de la poulie en serrant la sangle 4 du côté du brin libre 6 de celle-ci. Comme on le voit sur la figure 2, le profil du galet presseur 7 correspond à celui de la périphérie de la poulie 1, c'est-à-dire est plat pour assurer le serrage de la sangle 4 sur toute la partie transversale de celle-ci.The tightening of the
La disposition du levier 8 est choisie de façon que la partie de la périphérie de la poulie 1 avec laquelle coopère la sangle 4 soit aussi grande que possible afin de rendre optimale l'adhérence de la sangle sur la poulie.The arrangement of the
En référence maintenant à la figure 3, on a représenté une autre forme d'exécution de l'appareil selon l'invention, suivant laquelle le serrage de la sangle 14 sur la périphérie de la poulie 12, fixée sur l'arbre 13, est assuré par une pluralité de galets indépendants 24 disposés tout autour de la poulie suivant des directions radiales. Chaque galet 24 est monté fou sur une chape 25 contrainte par un ressort 26, s'appuyant sur un carter 27, dans la direction de la poulie. Deux galets 28, montés fous sur des axes fixes 29, assurent le guidage de la sangle 14 au début et à la fin de son engagement.Referring now to Figure 3, there is shown another embodiment of the apparatus according to the invention, according to which the tightening of the strap 14 on the periphery of the
On comprend qu'avec ce montage à galets presseurs indépendants, on peut appliquer la charge indifféremment à l'un ou l'autre des deux brins 15,16 de la sangle 14.It is understood that with this assembly with independent pressure rollers, the load can be applied indifferently to one or the other of the two
Selon une autre forme d'exécution représentée aux figures 4 et 5, on a représenté un treuil comprenant un arbre d'entraînement 31 qui traverse l'ouverture centrale 32 d'une chape 33 constituée de deux flasques 34,35 assemblés l'un à l'autre au moyen de boulons 36 et d'entretoises 37. Sur l'arbre 31 est fixée une poulie 38 dont la périphérie 39 est réalisée en une matière synthétique à fort coefficient de friction. Vers l'extérieur, la partie périphérique 39 de la poulie 38 présente en section un profil en V très ouvert conçu pour une bonne coopération avec la partie intermédiaire d'une sangle 4O qui s'enroule autour de la poulie. A l'un des brins 41 de la sangle est attelée la charge (non représentée au dessin) à haler ou à déhaler, alors que l'autre brin 42 de la sangle est libre.According to another embodiment shown in Figures 4 and 5, there is shown a winch comprising a
Le serrage de la sangle 4O sur la périphérie de la poulie 38 est assuré par une chaîne à maillons constituée d'une succession de maillons 43 reliés entre eux par des axes 44, chaque axe 44 portant un galet 45 présentant un profil en V conjugué avec celui de la partie périphérique 39 de la poulie 38.The tightening of the
Un maillon terminal 43′, disposé du côté du brin chargé 41 de la sangle, est fixé à la chape de la poulie au moyen d'un axe 46. Sur cet axe 46 est articulé une extrémité d'une biellette 47 dont l'extrémité opposée porte l'axe d'un galet déflecteur 48 sur lequel passe le brin chargé 41 de la sangle. L'autre maillon terminal 43" de la chaîne est relié par son axe 44" à une extrémité d'une bielle 49 dont l'extrémité opposée est articulée sur un axe 5O solidaire de la chape. La bielle 49 présente axialement une pluralité d'ouvertures 51 permettant sélectivement, au moyen d'un axe 52 la fixation articulée réglable d'une extrémité d'une bielle de liaison 53 dont l'autre extrémité s'articule sur l'axe du galet déflecteur 48.A
On comprend que, lors de l'entraînement en rotation de la poulie 38 (au moyen d'un système d'entraînement non représenté au dessin), la transmission de ce mouvement à la sangle 4O est assurée de façon efficace par le serrage de cette dernière entre la gorge de poulie et les galets presseurs 44, la force de serrage étant d'autant plus élevée que la charge attachée au brin 41 de la sangle est importante en raison de l'action du galet déflecteur 48 et de la bielle de liaison 53. La possiblité de réglage de la liaison entre les bielles 49 et 53 permet de faire varier, pour une valeur donnée de la charge, l'effort de traction exercé, sous l'influence de celle-ci, par le galet déflecteur 48 sur l'extrémité libre de la chaîne.It is understood that, during the rotational drive of the pulley 38 (by means of a drive system not shown in the drawing), the transmission of this movement to the
Selon la forme d'exécution représentée maintenant à la figure 6 le serrage de la sangle 54, sur la périphérie d'une poulie 55 montée sur un arbre 56, s'effectue au moyen d'une chaîne à maillons. Les maillons successifs 57 constituant la chaîne sont reliés entre eux par des axes 58 portant chacun un galet presseur 59. Du côté du brin chargé 6O de la sangle 54, l'axe 58′ portant le dernier galet presseur 59′ est relié à un point fixe. La position de ce dernier est déterminée de façon à maintenir au moins le galet 59′ en contact avec la sangle 54. A l'autre extrémité le dernier maillon 57 est relié à l'axe du galet 61 monté en bout d'un levier 62 pivotant autour d'un axe fixe 63. Selon la disposition déjà décrite à la figure 1, un ressort 64 s'appuyant sur un point fixe 65 contraint le levier 62 vers sa position pressant la chaîne contre la périphérie de la poulie.According to the embodiment now shown in Figure 6 the tightening of the
A la figure 7 on a représenté la périphérie 69 de la poulie 68 d'un appareil selon l'invention, avec une gorge à courbure concave 71 de forme elliptique, le galet presseur 72 serrant la sangle 7O dans la gorge ayant un profil exactement complémentaire. La forme concave du profil de gorge peut bien sûr être différente, par exemple circulaire.In Figure 7 there is shown the
A la figure 8, le profil représenté de la gorge de la poulie 73 présente un fond plat 74 accueillant le galet 75. A la figure 9 le profil de la périphérie 76 de la poulie 77 a la forme d'un V de grande ouverture 78 dont le fond est constitué par un arc tangent aux deux branches du V. A la figure 1O le profil de la gorge de la poulie 79 a la forme d'un V de grande ouverture 8O dont le fond est plat. A la figure 11 le profil de gorge 81 de la poulie 82 a une forme convexe circulaire, mais on comprend que cette forme convexe pourrait être elliptique. Enfin, à la figure 12, le profil de gorge 83 de la poulie 84 a une forme convexe en V renversé de très grande ouverture, dont le sommet est aplati. On comprend toutefois que le sommet pourrait être effilé ou encore arqué.In FIG. 8, the profile shown of the groove of the
En référence maintenant à la figure 13, on a représenté une autre forme de réalisation de l'appareil selon l'invention associant deux dispositifs tels que celui représenté aux figures 1 et 2, sur les poulies 85,86 desquels la sangle 87 passe successivement selon une trajectoire en S. Avec une telle disposition, on augmente bien sûr très sensiblement les possibilités de l'appareil.Referring now to Figure 13, we have represented another embodiment of the apparatus according to the invention associating two devices such as that represented in FIGS. 1 and 2, on the
Dans la forme d'exécution de la figure 14, on a représenté en 91 la poulie motrice sur la périphérie de laquelle circule une sangle 92. On a représenté en 93 un galet monté sur un bras pivotant 94 et pressant la sangle 92 sur la poulie 91 sous l'action d'un ressort 95. On a désigné en 96 le brin chargé de la sangle 92 et en 97 le brin mou de celle-ci.In the embodiment of Figure 14, there is shown in 91 the drive pulley on the periphery of which circulates a
Le guide de déflexion 98 est constitué par une plaque métallique pliée présentant une face supérieure arquée 99 de même rayon de courbure que celui de la poulie 91. La face 99 du guide 98 est destinée à épouser la forme de la périphérie de la poulie 91 sur sa partie non couverte par l'enroulement de la sangle 92 et s'étend de l'un à l'autre des deux points d'insertion de la sangle 92 sur la poulie. Deux faces latérales 1OO prolongent la face arquée 99 et guident chacune le parcours souhaité de la sangle 92 à l'intérieur de l'appareil. Les extrémités des faces 1OO sont jointes par une face inférieure 1O1 reposant sur les supports 1O2 solidaires du carter de l'appareil, de façon que la face arquée 99 soit maintenue en place en position d'extrême proximité de l'arc de la poulie 91 qu'elle recouvre.The deflection guide 98 is constituted by a folded metal plate having an arcuate
On comprend qu'ainsi, lors d'une opération de levage de la charge attelée au brin 96, il n'y a aucun risque que le brin mou 97 sortant de la poulie 91 puisse venir accidentellement s'engager entre la périphérie de la poulie et le brin chargé 96 s'engageant sur celle-ci. De même lors d'une opération de déhalage, si l'action de la charge venait à ne plus s'appliquer sur le brin 96 par exemple à la suite de la rencontre d'un obstacle, il n'y aurait pas de risque que le brin 96 puisse s'engager entre la périphérie de la poulie et le brin mou rentrant 97.It is understood that thus, during a lifting operation of the load coupled to the
A la figure 15 on a représenté une variante de l'appareil de la figure 14 avec un dispositif de déflexion 1O4 différent comprenant une face arquée 1O5 réalisée en une matière élastique et qui présente un rayon de courbure sensiblement inférieur à celui de la poulie 1O6. Les extrémités de la face arquée 1O5 sont appliquées en friction sur la périphérie de la poulie 1O6 sous l'action d'un ressort 1O7 agissant dans la direction de l'axe de symétrie de la face 1O5. Le ressort 1O7 s'appuie sur un point fixe 1O8 solidaire du carter de l'appareil par l'intermédiaire d'un dispositif 1O9 qui permet de repérer et de régler la compression du ressort.In Figure 15 there is shown a variant of the apparatus of Figure 14 with a different deflection device 1O4 comprising an arcuate face 1O5 made of an elastic material and which has a radius of curvature substantially less than that of the pulley 1O6. The ends of the arcuate face 1O5 are applied in friction to the periphery of the pulley 1O6 under the action of a spring 1O7 acting in the direction of the axis of symmetry of the face 1O5. The
De plus, comme on l'a représenté sur la figure 15, le brin chargé 11O et le brin mou 111 de la sangle 112 passent chacun entre deux galets 113,114 d'axes parallèles à l'axe de la poulie 1O6. Les galets 113 sont entraînés en rotation, par la poulie 1O6, au moyen d'une courroie 115, avec une vitesse linéaire périphérique de rotation qui est égale à la vitesse linéaire imprimée par la poulie 1O6 à la sangle 112. Les galets 114 sont à rotation libre et pressent la sangle 112 contre les galets 113 sous l'action de ressorts 116. On comprend que le brin de la sangle 112 sortant de la poulie 1O6 est entraîné par les galets 113,114 à la même vitesse de rotation que celle de la poulie 1O6, ce qui empêche la formation accidentelle d'une boucle de ce brin susceptible de pouvoir s'engager entre la poulie et le brin de la sangle 112 rentrant sur celle-ci.In addition, as shown in Figure 15, the loaded
En variante, comme représenté à la figure 14, le système de galets 113,114 est remplacé, du côté du brin mou 97 de la sangle 92, par un tambour d'enrouglement 118 de ce brin 97 muni d'un ressort 119 le sollicitant constamment dans le sens de l'enroulement (sens de la flèche A) quel que soit le sens de rotation du tambour 118.Alternatively, as shown in FIG. 14, the roller system 113,114 is replaced, on the side of the
Enfin, comme on l'a représenté pour la variante de la figure 16, à chaque paire de galets 113,114 est associée une paire de galets 12O,121 orientés perpendiculairement à ceux-ci pour encadrer la sangle et montés en rotation libre. L'association des galets motorisés 113,114 et des galets 12O,121 applique sur le brin de la sangle avec lequel ces galets coopèrent une tension permettant d'éviter que le brin de la sangle ne vienne, se coincer en raison de sa flexibilité.Finally, as shown for the variant of Figure 16, each pair of rollers 113,114 is associated with a pair of rollers 120, 121 oriented perpendicularly to these to frame the strap and mounted in free rotation. The association of motorized rollers 113,114 and rollers 12O, 121 applies a tension on the strap strand with which these rollers cooperate, making it possible to prevent the strap strand from coming into wedge because of its flexibility.
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 apportée sans sortir du cadre de l'invention déterminé par les revendications qui suivent.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 thereto without departing from the scope of the invention determined by the claims which follow.
Claims (11)
- Device for driving a load comprising a pulley (1, 12, 38, 91, 106) driven in rotation, a flexible belt (4, 14, 40, 54, 70, 92, 112) which unwinds on the periphery of the said pulley, the load being fixed to a run of the said belt, and constraining means for pressing the belt (4, 14, 40, 54, 70, 92, 112) onto the peripheral surface of the pulley, the said means consisting principally of at least one roller (7, 24, 45, 59, 72, 93), and the peripheral surface of the pulley (1, 12, 38, 91, 106) being profiled to receive the coil of such a belt in co-operation with a counter-profile, characterised in that the belt (4, 14, 40, 54, 70, 92, 112) is flat, and the counter-profile corresponds to the profile of the peripheral surface of the pulley and belongs to the peripheral surface of the pressure roller or rollers (7, 24, 45, 59, 72, 93).
- Device as claimed in claim 1, characterised in that the peripheral surface of the pulley (73) has a profile (74) intended to ensure the centering of the flat belt (70), when it is unwinding, with respect to the median plane, the said profile (74) being flat and framed by flanges, whilst the peripheral profile of the pressure element (75) is equally flat.
- Device as claimed in claim 1, characterised in that the peripheral surface (39, 69, 76) of the pulley (38, 68, 77, 79) has a profile intended to ensure the centering of the flat belt (40, 70), when it is unwinding, with respect to the median plane, the said profile (71, 78, 80) being concave with an elliptical shape or in a very flattened V shape, possibly with a flat base or a base formed by an arc tangent on the two branches of the V, the peripheral profile of the pressure element (45, 72) being the counter-profile corresponding to the peripheral profile of the pulley.
- Device as claimed in claim 1, characterised in that the peripheral surface of the pulley (82, 84) has a profile intended to ensure the centering of the flat belt (70), when it is unwinding, with respect to the median plane, the said profile (81, 83) being convex with an elliptical shape or in the shape of a very flattened V, possibly with a flat base or a base formed by an arc tangent on the two branches of the V, the peripheral profile of the pressure element being the counter-profile corresponding to the peripheral profile of the pulley.
- Device as claimed in any one of the preceding claims, characterised by a deflecting guide (98, 104) associated with the pulley (91, 106) between the two points where the flexible flat belt (92, 112) comes into contact and goes out of contact with the pulley, according to the direction of rotation of the latter, and the said deflecting guide deflects the run of the belt coming from the pulley out of the circular path which the latter, by its movement, tends to impart thereto.
- Device as claimed in claim 5, characterised in that the deflecting guide (98) has a curved face (102) placed facing and in the extreme proximity of the arc portion of the pulley (91) which is prevents from having access to the run of the flexible flat belt (92) coming from the pulley, the said curved surface (102) being concentric with the arc of the pulley.
- Device as claimed in claim 5, characterised in that the deflecting guide (104) has a curved face (105) placed facing and in the extreme proximity of the arc portion of the pulley (106) which it prevents from having access to the run of the flexible flat belt (112) coming from the pulley, the radius of curvature of the said face (105) being substantially less than that of the pulley and its two ends being applied in friction against the periphery of the pulley, possibly in a position which is movable towards the centre of the pulley under the effect of a spring (107), the said position being capable of being regulated for a more or less strong friction or to break the contact of the two ends of the said face (105) with the periphery of the pulley.
- Device as claimed in claim 6, characterised in that the curved face (102) of the deflecting guide (98) is prolonged at each of its ends by a lateral face (100) according to an arrangement for orientating the unwinding of the run of the belt (92) towards an outlet opening in the housing of the apparatus.
- Device as claimed in any one of claims 1 to 8, characterised in that a pair of rollers (113, 114) arranged on either side of the flat belt (92, 112), between the pulley (91, 106) and the opening of the apparatus, at least on the side of the slack run, the axes of the said rollers being parallel to that of the pulley, and the pair of rollers is applied in constant contact with each of the flat faces of the said belt in such a way as to accompany its movement, one (114) of the rollers being pressed for this purpose against the said run by a spring (116) and one (113) of these rollers being driven at the same peripheral speed as the pulley.
- Device as claimed in claim 9, characterised in that the pair or pairs of rollers (113, 114) is or are completed by a pair of rollers (120, 121) situated near to them, the axes of which are perpendicular to the axes of the first ones in such a way as to frame the run in question on all its faces.
- Device as claimed in one of claims 1 to 10, characterised in that it includes a system (118) for winding up the slack run (97), acted on constantly by a spring mechanism (119) in the direction of winding, whatever the direction of rotation of the said winding system (118) may be.
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8806635 | 1988-05-18 | ||
FR8806635A FR2631616B1 (en) | 1988-05-18 | 1988-05-18 | SELF-TIGHTENING WINCH FOR TRIPPING A STRAP |
FR8807409 | 1988-06-03 | ||
FR8807409A FR2632374B1 (en) | 1988-06-03 | 1988-06-03 | APPARATUS FOR DRIVING A FLEXIBLE LINK SUCH AS A STRAP OR BELT |
FR8807611A FR2632622B2 (en) | 1988-05-18 | 1988-06-08 | SELF-TIGHTENING WINCH FOR THE STRAPPING OF A STRAP |
FR8807611 | 1988-06-08 | ||
FR8814700A FR2638802B2 (en) | 1988-06-03 | 1988-11-10 | APPARATUS FOR DRIVING A FLEXIBLE LINK SUCH AS A STRAP OR BELT |
FR8814700 | 1988-11-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0343063A1 EP0343063A1 (en) | 1989-11-23 |
EP0343063B1 true EP0343063B1 (en) | 1992-09-16 |
Family
ID=27446624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890401356 Expired - Lifetime EP0343063B1 (en) | 1988-05-18 | 1989-05-17 | Winch for driving a strap |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0343063B1 (en) |
DE (1) | DE68902870T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3573918B1 (en) * | 2017-01-27 | 2023-10-04 | PLANETA-Hebetechnik GmbH | Continuous cable winch |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ZM4889A1 (en) * | 1989-12-29 | 1990-05-28 | Giuseppe Raimo Zambia | Cableway transportation |
GB2292723A (en) * | 1994-09-01 | 1996-03-06 | Trewhella Bros | Multi-roll capstan |
SG154361A1 (en) * | 2008-01-30 | 2009-08-28 | Seow Tiong Bin | A hoist |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE13494C (en) * | W. SCHUFFENHAUER in Zehlendorf | Machine for lifting loads | ||
BE520967A (en) * | ||||
FR378795A (en) * | 1907-02-19 | 1907-10-16 | Eloesser Kraftband Ges Mit Bes | Control for power transmission |
FR1121039A (en) * | 1955-02-01 | 1956-07-19 | Logging winch | |
AT297988B (en) * | 1969-11-11 | 1972-04-25 | Dickertmann Hebezeugfabrik A G | Winch |
US3608389A (en) * | 1969-12-05 | 1971-09-28 | George C Christian | Load responsive gripping device for flexible cable drives and the like |
GB1362514A (en) * | 1970-03-16 | 1974-08-07 | Teleflex Ltd | Winches |
DE2041993A1 (en) * | 1970-08-25 | 1972-03-02 | Carl Kaeufer | Winch for hanging frames |
SG60232G (en) * | 1979-02-13 | 1985-06-07 | Sky Safety Engineering Pte Ltd | A drive mechanism |
GB2171973A (en) * | 1985-03-05 | 1986-09-10 | Fitzgerald Smith Lt Col James | In-line Capstan Winch |
-
1989
- 1989-05-17 EP EP19890401356 patent/EP0343063B1/en not_active Expired - Lifetime
- 1989-05-17 DE DE1989602870 patent/DE68902870T2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3573918B1 (en) * | 2017-01-27 | 2023-10-04 | PLANETA-Hebetechnik GmbH | Continuous cable winch |
Also Published As
Publication number | Publication date |
---|---|
DE68902870D1 (en) | 1992-10-22 |
DE68902870T2 (en) | 1993-05-06 |
EP0343063A1 (en) | 1989-11-23 |
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