EP0334808A1 - Device for suspending loads from a hoist - Google Patents

Device for suspending loads from a hoist Download PDF

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Publication number
EP0334808A1
EP0334808A1 EP89810190A EP89810190A EP0334808A1 EP 0334808 A1 EP0334808 A1 EP 0334808A1 EP 89810190 A EP89810190 A EP 89810190A EP 89810190 A EP89810190 A EP 89810190A EP 0334808 A1 EP0334808 A1 EP 0334808A1
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EP
European Patent Office
Prior art keywords
piston
cylinder
load
communication
suspension device
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.)
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EP89810190A
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German (de)
French (fr)
Inventor
Charles Rerat
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Recomatic SA
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Recomatic SA
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Publication date
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Publication of EP0334808A1 publication Critical patent/EP0334808A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack

Definitions

  • a lifting device such as a hoist, overhead crane or crane for example.
  • devices are already known for suspending a load from a lifting device comprising a cylinder-piston assembly of which each of the parts, the cylinder and the piston, are provided with hooking means making it possible to hang them. one to the lifting device and the other to the load, and further comprising a means of communication with adjustable throttling between the two ends of the cylinder so that under the effect of the load, an incompressible fluid occupying the cylinder flows through the throttle with a regulated flow rate, thus regulating a displacement at constant speed of the piston in the cylinder.
  • these devices aim to ensure the displacement of the load with a set speed, slow and regular, which can be canceled in a precise manner at moment when the load comes into contact with the base on which it must rest.
  • the object of the present invention is to remedy this shortcoming. It follows from the observation that one of the shortcomings of the known devices was the difficulty there was in ensuring the tightness of the piston in the cylinder, throughout the long-term use of these devices which are subjected to service to shocks and brutal stresses.
  • the device according to the invention is characterized in that the piston comprises a piston disc integral with two coaxial rod segments and in that the cylinder has two end flanges each provided with a guide opening, each piston rod passing through one of these openings so as to produce a sealed guide ensuring a perfectly coaxial relative movement between the cylinder and the piston.
  • Fig. 2 shows the main elements constituting a form of the object of the invention.
  • the device consists of a cylinder 1 in which slides a piston 3 guided by bores provided in the flanges 18 and 19 which form the ends of the cylinder.
  • the cylinder 1 comprises, in addition to the flanges 18 and 19, a ferrule 29 forming its side wall.
  • the piston 3 itself comprises, in one piece, a piston disk 2 and two coaxial rod segments 30 and 31 which extend on both sides of the disc 2 and pass through guide openings in the flanges 18 and 19.
  • At the upper end of the rod 30 is fixed a hooking ring 20 while a lifting flange 21 is fixed to the flange 19.
  • the hooking ring 20 is hooked to the lifting device (hoist or other) while the load to be lifted is fixed to the lifting flange 21.
  • the piston disc 2 delimits two chambers, the main chamber 4 and the secondary chamber 5.
  • the chambers are connected to each other, on the one hand, by the conduits 6 and 7, between which the device d 'throttle 8 with needle screw closed in the rest position and, on the other hand, by the conduits 11 closed by the valve 10 when the device and under load.
  • the cylinder 1 is filled with oil and when the device is under load, that is to say when a tensile force is applied to the flange 21, and when the screw 32 of the device 8 is closed, c that is to say that its tip closes the segment of conduit 33 pierced in the body 34 of the device, the oil in the main chamber is pressurized, which generates a force on the upper surface of the valve 10.
  • a pressure gauge 22 (fig. 1) graduated in force units, connected to the orifice 17 will give the weight of the suspended load to the device, the hydraulic pressure being directly proportional to the applied load.
  • the return spring 9 When the device is no longer stressed by the load, the return spring 9 will push the cylinder upwards, the valve 10 opening and freeing the passage formed by the holes 11. The secondary chamber will therefore be emptied through this valve and the main chamber will fill with oil. When practically all the oil has thus been transferred to the main chamber, the valve 10 will close under the effect of its return spring 12 which is fixed to the rod 30 by the seat 13 and the elastic ring 14. The suspension device, after closing the needle, is again ready to operate. It should be noted that the device can be used in the inverted position, that is to say that the cylinder, by its lifting flange 21, can be hooked to the lifting machine and the load can be hooked to the attachment ring 20, integral with the rod, the function of the device remaining identical.
  • the needle screw device 8 can be replaced by any other means of adjusting the flow (ball adjustment, for example).
  • the manually controlled flow adjustment device can be replaced by a remote control adjustment device by means of an electric, pneumatic stepping motor or any other servo means.
  • Two threaded ports 15 and 16 one communicating with the main chamber and the other with the secondary chamber, are provided for the installation of such a remote control, this by means of two pipes connected on the one hand, to these orifices and on the other hand, to a needle flow regulation means by example.
  • the piston seal is designed to provide a seal at high pressure while having a minimum coefficient of friction against the interior surface of the cylinder.
  • it and consists of two elements: an O-ring 23 and an annular seal with rectangular section on PTFE or equivalent 24.
  • the sealing principle of this assembly is as follows: The groove constituting the cage of these seals has a width slightly greater than the width of the annular seal; the O-ring is placed at the bottom of this groove and the annular seal is housed so as to cover the O-ring.
  • a safety element preventing the load from going down to a high speed when the needle is fully opened, has been provided by means of a reduction in the section of one of the conduits 6 or 7 over a short distance, this constriction (not shown) having the effect of reducing the flow rate passing through the said conduits and consequently limiting the piston-cylinder translation speed.
  • a similar section reduction is provided on one or other of the conduits connected to the orifices 15 and 16.
  • Fig. 3 shows another embodiment of the suspension device which is the subject of the invention, in which an additional element has been integrated into the device as described above.
  • It is a handle 26, integral with a part 27 rigidly coupled to the body 25 of the needle screw device 8.
  • the function of this handle is twofold. On the one hand, it allows easier handling, using one hand, of the lifting device and, therefore, easily direct the load suspended from said device.
  • the second function of this handle is to open or close the passage of oil from the main chamber 4 to the secondary chamber 5, this in the following manner:
  • the valve body 25 of the seat of the needle screw is fixed to the flange 19 so as to allow a partial rotation of said body 25 in its housing.
  • a simple and known device such as, for example, a stud screw screwed into the flange 19 and the stud of which would engage in a groove machined in the body 25, makes it possible to obtain this effect.
  • a partial rotation of the handle 26 will either block the passage of the oil from the main chamber 4 to the secondary chamber 5, the axes of the channels 11 and 28 no longer being aligned and the channels no longer communicating, either to authorize the passage of the oil from the main chamber 4 to the secondary chamber 5, when the rotation of the handle 26 and, consequently of the body 25 is such, that the axes of the channels 11 and 28 are aligned.
  • the oil flow rate can be adjusted beforehand using the device 8 and no longer needs to be imperatively modified in the event of repeated use of the device under similar conditions.
  • this device which does not require any external energy input, provides great ease of handling in handling, since it allows them to descend very gently onto its location. .
  • This device can be built in different sizes, diameters, strokes and shapes as well as for different load values. Its operation is reliable and it supports the shocks inevitably resulting from its use.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

The shank (2) is integral with a piston which is able to slide up and down inside the cylinder (1), this being when the marker screw (8) is partly open, the result of which is a downward translational movement, at an adjustable speed, of the load attached to the cylinder by the flange (21). The translational speed may thus be adjusted in order that the load is lowered very slowly and gently into position. …<IMAGE>…

Description

On connaît les difficultés qu'il y a à poser des charges sans choc sur des machines-outils ou au­tres, ceci lorsque l'on utilise un appareil de levage tel que palan, pont-roulant ou grue par exemple. Pour remédier à ces difficultés, on connaît déjà des dispo­sitifs de suspension d'une charge à un appareil de le­vage comportant un ensemble cylindre-piston dont chacu­ne des parties, le cylindre et le piston, sont pourvues de moyens d'accrochage permettant de les accrocher l'u­ne à l'appareil de levage et l'autre à la charge, et comportant en outre un moyen de communication à étran­glement réglable entre les deux extrémités du cylindre de manière que sous l'effet de la charge, un fluide in­compressible occupant le cylindre s'écoule par l'étran­glement avec un débit réglé, réglant ainsi un déplace­ment à vitesse constante du piston dans le cylindre.We know the difficulties there are in placing loads without impact on machine tools or other, this when using a lifting device such as a hoist, overhead crane or crane for example. To overcome these difficulties, devices are already known for suspending a load from a lifting device comprising a cylinder-piston assembly of which each of the parts, the cylinder and the piston, are provided with hooking means making it possible to hang them. one to the lifting device and the other to the load, and further comprising a means of communication with adjustable throttling between the two ends of the cylinder so that under the effect of the load, an incompressible fluid occupying the cylinder flows through the throttle with a regulated flow rate, thus regulating a displacement at constant speed of the piston in the cylinder.

Ainsi, par réglage de la section d'un étran­glement souvent au moyen d'une vis à pointeau, ces dis­positifs visent à assurer le déplacement de la charge avec une vitesse réglée, lente et régulière, qui peut être annulée d'une manière précise au moment où la charge entre en contact avec l'embase sur laquelle elle doit reposer.Thus, by adjusting the section of a throttle often by means of a needle screw, these devices aim to ensure the displacement of the load with a set speed, slow and regular, which can be canceled in a precise manner at moment when the load comes into contact with the base on which it must rest.

Des dispositifs de ce genre sont décrits no­tamment dans les documents suivants: US-A-2,860,908, DE-A-2,317,555, FR-A-1,497,666, DE-C-941,021 et US-A-2,500,459.Devices of this kind are described in particular in the following documents: US-A-2,860,908, DE-A-2,317,555, FR-A-1,497,666, DE-C-941,021 and US-A-2,500,459.

Cependant, aucun des appareils décrits dans ces documents ne s'est avéré d'un usage facile et fia­ble dans la pratique, de sorte que le besoin d'un dis­positif satisfaisant dans les faits aux exigences indi­quées se faisait encore sentir.However, none of the devices described in these documents has been found to be easy and reliable to use in practice, so that there is still a need for a device which in fact satisfies the requirements indicated.

La présente invention a pour but de remédier à cette lacune. Elle découle de la constatation que l'une des déficiences des dispositifs connus était la diffi­culté qu'il y avait à assurer l'étanchéité du piston dans le cylindre, tout au long d'une utilisation de longue durée de ces appareils qui sont soumis en servi­ce à des chocs et des sollicitations brutales.The object of the present invention is to remedy this shortcoming. It follows from the observation that one of the shortcomings of the known devices was the difficulty there was in ensuring the tightness of the piston in the cylinder, throughout the long-term use of these devices which are subjected to service to shocks and brutal stresses.

Dans ce but, le dispositif selon l'invention est caractérisé en ce que le piston comporte un disque de piston solidaire de deux segments de tige coaxiaux et en ce que le cylindre présente deux flasques d'ex­trémité munis chacun d'une ouverture de guidage, chaque tige de piston traversant une de ces ouvertures de ma­nière à réaliser un guidage étanche assurant un dépla­cement relatif parfaitement coaxial entre le cylindre et le piston.For this purpose, the device according to the invention is characterized in that the piston comprises a piston disc integral with two coaxial rod segments and in that the cylinder has two end flanges each provided with a guide opening, each piston rod passing through one of these openings so as to produce a sealed guide ensuring a perfectly coaxial relative movement between the cylinder and the piston.

On va décrire ci-après, à titre d'exemple, une forme de réalisation de l'objet de l'invention en se référant au dessin annexé dont:

  • la fig. 1 est une vue en élévation du disposi­tif en position de travail, accroché à un engin de le­vage et supportant une charge,
  • la fig. 2 est une vue en coupe axiale d'une forme d'exécution du dispositif,
  • la fig. 3 est une vue en coupe axiale d'une autre forme d'exécution du dispositif.
An embodiment of the object of the invention will be described below, by way of example, with reference to the attached drawing, in which:
  • fig. 1 is an elevational view of the device in the working position, attached to a lifting device and supporting a load,
  • fig. 2 is an axial section view of an embodiment of the device,
  • fig. 3 is an axial sectional view of another embodiment of the device.

La fig. 2 montre les éléments principaux cons­tituant une forme de l'objet de l'invention. Le dispo­sitif est composé d'un cylindre 1 dans lequel coulisse un piston 3 guidé par des alésages prévus dans les flasques 18 et 19 qui forment les extrémités du cylindre. Le cylindre 1 comporte outre les flasques 18 et 19 une virole 29 formant sa paroi latérale. Le pis­ton 3 comporte lui-même, en une pièce, un disque de piston 2 et deux segments de tige coaxiaux 30 et 31 qui s'étendent des deux côtés du disque 2 et traversent des ouvertures de guidage ménagées dans les flasques 18 et 19. A l'extrémite supérieure de la tige 30 est fixé un anneau d'accrochage 20 alors qu'une bride de levage 21 est fixée au flasque 19. L'anneau d'accrochage 20 est accroché à l'appareil de levage (palan ou autre) alors que la charge à soulever est fixée à la bride de levage 21.Fig. 2 shows the main elements constituting a form of the object of the invention. The device consists of a cylinder 1 in which slides a piston 3 guided by bores provided in the flanges 18 and 19 which form the ends of the cylinder. The cylinder 1 comprises, in addition to the flanges 18 and 19, a ferrule 29 forming its side wall. The piston 3 itself comprises, in one piece, a piston disk 2 and two coaxial rod segments 30 and 31 which extend on both sides of the disc 2 and pass through guide openings in the flanges 18 and 19. At the upper end of the rod 30 is fixed a hooking ring 20 while a lifting flange 21 is fixed to the flange 19. The hooking ring 20 is hooked to the lifting device (hoist or other) while the load to be lifted is fixed to the lifting flange 21.

Le disque de piston 2 délimite deux chambres, la chambre principale 4 et la chambre secondaire 5. Les chambres sont reliées l'une à l'autre, d'une part, par les conduits 6 et 7, entre lesquels est placé le dispo­sitif d'étranglement 8 à vis pointeau obturé en posi­tion de repos et, d'autre part, par les conduits 11 ob­turés par la soupape 10 lorsque l'appareil et sous charge. Le cylindre 1 est rempli d'huile et lorsque l'appareil est sous charge, c'est-à-dire lorsque l'on applique une force de traction sur la bride 21, et lorsque la vis 32 du dispositif 8 est fermée, c'est-à-dire que sa pointe obture le segment de conduit 33 percé dans le corps 34 du dispositif, l'huile dans la chambre principale est mise sous pression, ce qui engendre une force sur la surface supérieure de la sou­pape 10. Le ressort 12 maintient cette soupape fermée et le piston 3 reste dans une position relative fixe par rapport au cylindre 1. Un manomètre 22 (fig. 1) gradué en unités de force, connecté à l'orifice 17 don­nera le poids de la charge suspendue à l'appareil, la pression hydraulique étant directement proportionnelle à la charge appliquée.The piston disc 2 delimits two chambers, the main chamber 4 and the secondary chamber 5. The chambers are connected to each other, on the one hand, by the conduits 6 and 7, between which the device d 'throttle 8 with needle screw closed in the rest position and, on the other hand, by the conduits 11 closed by the valve 10 when the device and under load. The cylinder 1 is filled with oil and when the device is under load, that is to say when a tensile force is applied to the flange 21, and when the screw 32 of the device 8 is closed, c that is to say that its tip closes the segment of conduit 33 pierced in the body 34 of the device, the oil in the main chamber is pressurized, which generates a force on the upper surface of the valve 10. The spring 12 keeps this valve closed and the piston 3 remains in a fixed relative position relative to the cylinder 1. A pressure gauge 22 (fig. 1) graduated in force units, connected to the orifice 17 will give the weight of the suspended load to the device, the hydraulic pressure being directly proportional to the applied load.

Lorsque l'on désire obtenir un déplacement de la charge vers le bas, il suffit d'ouvrir la liaison entre les conduits 6 et 7 en dévissant la vis-pointeau 32, ce qui permet à l'huile contenue dans la chambre principale 4 de s'écouler dans la chambre secondaire 5, provoquant par là une translation vers le bas du cylin­dre 1 et, par conséquent, de la charge. La vitesse de descente se règle par le degré d'ouverture du conduit 33 par le pointeau de la vis 32 qui module le débit d'huile s'écoulant de la chambre supérieure vers la chambre inférieure. La vis pointeau peut être munie de graduations facilitant un réglage répétitif de la vi­tesse de descente d'une charge donnée.When it is desired to obtain a displacement of the load downwards, it suffices to open the connection between the conduits 6 and 7 by unscrewing the needle screw 32, which allows the oil contained in the main chamber 4 to flow into the secondary chamber 5, thereby causing a downward translation of the cylinder 1 and, consequently, of the load. The descent speed is regulated by the degree of opening of the conduit 33 by the needle of the screw 32 which modulates the flow of oil flowing from the upper chamber to the lower chamber. The needle screw can be provided with graduations facilitating a repetitive adjustment of the rate of descent of a given load.

Au moment où l'appareil n'est plus sollicité par la charge, le ressort de rappel 9 repoussera le cy­lindre vers le haut, la soupape 10 s'ouvrant et libé­rant le passage constitué par les trous 11. La chambre secondaire sera par conséquent vidée à travers cette soupape et la chambre principale se remplira d'huile. Lorsque pratiquement toute l'huile aura ainsi été transvasée dans la chambre principale, la soupape 10 se refermera sous l'effet de son ressort de rappel 12 qui est fixé à la tige 30 par le le siége 13 et l'anneau élas­tique 14. Le dispositif de suspension, après avoir re­fermé le pointeau, est à nouveau prêt à fonctionner. Il est à noter que le dispositif peut être utilisé en po­sition inversée c'est-à-dire que le cylindre, de par sa bride de levage 21, peut être accroché a l'engin de levage et la charge peut être accrochée à l'anneau d'accrochage 20, solidaire de la tige, la fonction du dispositif restant identique. En outre, le dispositif 8 à vis pointeau peut être remplacé par tout autre moyen de réglage de débit (réglage à bille, par exemple). De plus, le dispositif de réglage de débit à commande ma­nuelle peut être remplacé par un dispositif de réglage commandé à distance au moyen d'un moteur pas à pas électrique, pneumatique ou tout autre moyen d'asservissement.When the device is no longer stressed by the load, the return spring 9 will push the cylinder upwards, the valve 10 opening and freeing the passage formed by the holes 11. The secondary chamber will therefore be emptied through this valve and the main chamber will fill with oil. When practically all the oil has thus been transferred to the main chamber, the valve 10 will close under the effect of its return spring 12 which is fixed to the rod 30 by the seat 13 and the elastic ring 14. The suspension device, after closing the needle, is again ready to operate. It should be noted that the device can be used in the inverted position, that is to say that the cylinder, by its lifting flange 21, can be hooked to the lifting machine and the load can be hooked to the attachment ring 20, integral with the rod, the function of the device remaining identical. In addition, the needle screw device 8 can be replaced by any other means of adjusting the flow (ball adjustment, for example). In addition, the manually controlled flow adjustment device can be replaced by a remote control adjustment device by means of an electric, pneumatic stepping motor or any other servo means.

Deux orifices filetés 15 et 16, communiquant l'un avec la chambre principale et l'autre avec la chambre secondaire, sont prévus pour l'installation d'une telle commande à distance, ceci par l'intermé­diaire de deux tuyaux branchés d'une part, à ces ori­fices et d'autre part, à un moyen de régulation de dé­bit à pointeau par exemple.Two threaded ports 15 and 16, one communicating with the main chamber and the other with the secondary chamber, are provided for the installation of such a remote control, this by means of two pipes connected on the one hand, to these orifices and on the other hand, to a needle flow regulation means by example.

Le joint d'étanchéité du piston est prévu pour assurer une étanchéité à haute pression tout en ayant un coefficient de frottement minimal contre la surface intérieure du cylindre. Dans la forme d'exécution, ci­itée à titre d'exemple, il et constitué de deux élé­ments: un joints torique 23 et un joint annulaire à sec­tion rectangulaire on PTFE ou équivalent 24. Le princi­pe d'étanchéité de cet ensemble est le suivant: La gor­ge constituant la cage de ces joints a une largeur lé­gèrement supérieure à la largeur du joint annulaire; le joint torique est placé au fond de cette gorge et le joint annulaire est logé de telle manière à recouvrir le joint torique. Lorsque la chambre principale est sous pression, l'huile s'écoule dans la gorge exerçant une pression sur le joint torique qui se déforme et vient exercer une pression contre le joint annulaire qui est, de ce fait, plaqué contre la face interne de la paroi 29 du cylindre assurant par là une étanchéité optimale et un faible coefficient de frottement entre le joint annulaire et la paroi du cylindre, ceci de par les caractéristiques propres du matériau employé pour la réalisation du joint annulaire. Ces deux éléments - une parfaite étanchéité et un glissement aisé du piston dans le cylindre - sont des caractéristiques essentielles au bon fonctionnement du dispositif de suspension objet de l'invention.The piston seal is designed to provide a seal at high pressure while having a minimum coefficient of friction against the interior surface of the cylinder. In the embodiment, cited by way of example, it and consists of two elements: an O-ring 23 and an annular seal with rectangular section on PTFE or equivalent 24. The sealing principle of this assembly is as follows: The groove constituting the cage of these seals has a width slightly greater than the width of the annular seal; the O-ring is placed at the bottom of this groove and the annular seal is housed so as to cover the O-ring. When the main chamber is under pressure, the oil flows into the groove exerting pressure on the O-ring which deforms and exerts pressure against the annular seal which is, therefore, pressed against the internal face of the wall 29 of the cylinder thereby ensuring optimum sealing and a low coefficient of friction between the annular seal and the wall of the cylinder, this by the specific characteristics of the material used for the production of the annular seal. These two elements - perfect sealing and easy sliding of the piston in the cylinder - are essential characteristics for the proper functioning of the suspension device object of the invention.

En outre, un élément de sécurité, empêchant la charge de descendre à une vitese élevée lorsque le pointeau est ouvert au maximum, a été prévu au moyen d'une diminution de la section de l'un des conduits 6 ou 7 sur une courte distance, cet étranglement (non représenté) ayant pour effet de réduire le débit pas­sant par les dits conduits et limitant, par conséquent, la vitesse de translation piston-cylindre. Une diminu­tion de section semblable est prévue sur l'un ou l'au­tre des conduits reliés aux orifices 15 et 16.In addition, a safety element, preventing the load from going down to a high speed when the needle is fully opened, has been provided by means of a reduction in the section of one of the conduits 6 or 7 over a short distance, this constriction (not shown) having the effect of reducing the flow rate passing through the said conduits and consequently limiting the piston-cylinder translation speed. A similar section reduction is provided on one or other of the conduits connected to the orifices 15 and 16.

Il va sans dire qu'un orifice de remplissage de fluide hydraulique ainsi qu'un orifice de purge d'air (non représentés) sont prévus.It goes without saying that a hydraulic fluid filling orifice and an air purge orifice (not shown) are provided.

La fig. 3 montre une autre forme d'exécution du dispositif de suspension objet de l'invention, dans laquelle un élément supplémentaire a été intégré au dispositif tel que décrit ci-avant. Il s'agit d'une poignée 26, solidaire d'une pièce 27 accouplée rigide­ment au corps 25 du dispositif à vis pointeau 8. La fonction de cette poignée est double. D'une part, elle permet une manutention plus aisée, à l'aide d'une seule main, du dispositif de levage et, par conséquent, de diriger facilement la charge suspendue audit dispositif. D'autre part, la deuxième fonction de cette poignée est d'ouvrir ou de fermer le passage de l'huile de la chambre principale 4 à la chambre secondaire 5, ceci de la manière suivante: Le corps de robinet 25 du siège de la vis pointeau est fixé à la bride 19 de tel­le manière à autoriser une rotation partielle dudit corps 25 dans son logement. Un dispositif simple et connu tel, par exemple, qu'une vis à téton vissée dans la bride 19 et dont le téton s'engagerait dans une rai­nure usinée dans le corps 25, permet d'obtenir cet effet.Fig. 3 shows another embodiment of the suspension device which is the subject of the invention, in which an additional element has been integrated into the device as described above. It is a handle 26, integral with a part 27 rigidly coupled to the body 25 of the needle screw device 8. The function of this handle is twofold. On the one hand, it allows easier handling, using one hand, of the lifting device and, therefore, easily direct the load suspended from said device. On the other hand, the second function of this handle is to open or close the passage of oil from the main chamber 4 to the secondary chamber 5, this in the following manner: The valve body 25 of the seat of the needle screw is fixed to the flange 19 so as to allow a partial rotation of said body 25 in its housing. A simple and known device such as, for example, a stud screw screwed into the flange 19 and the stud of which would engage in a groove machined in the body 25, makes it possible to obtain this effect.

Une rotation partielle de la poignée 26 aura pour conséquence, soit de bloquer le passage de l'huile de la chambre principale 4 à la chambre secondaire 5, les axes des canaux 11 et 28 n'étant plus alignés et les canaux ne communiquant plus, soit d'autoriser le passage de l'huile de la chambre principale 4 à la chambre secondaire 5, lorsque la rotation de la poignée 26 et, par conséquent du corps 25 est telle, que les axes des canaux 11 et 28 sont alignés. Le débit d'huile peut être préalablement réglé à l'aide du dispositif 8 et n'a plus besoin d'être impérativement modifié en cas d'utilisation répétitive du dispositif sous des conditions semblables.A partial rotation of the handle 26 will either block the passage of the oil from the main chamber 4 to the secondary chamber 5, the axes of the channels 11 and 28 no longer being aligned and the channels no longer communicating, either to authorize the passage of the oil from the main chamber 4 to the secondary chamber 5, when the rotation of the handle 26 and, consequently of the body 25 is such, that the axes of the channels 11 and 28 are aligned. The oil flow rate can be adjusted beforehand using the device 8 and no longer needs to be imperatively modified in the event of repeated use of the device under similar conditions.

Comme on peut aisément le constater, cet appa­reil, qui ne nécessite pas d'apport d'énergie extérieu­re, apporte dans la manutention une grande facilité de mise en place de charges, car il permet à celles-ci une descente très douce sur son emplacement. Cet appareil peut être construit en différentes grandeurs, diamè­tres, courses et formes ainsi que pour différentes valeurs de charges. Son fonctionnement est fiable et il supporte les chocs résultant inévitablement de son emploi.As can easily be seen, this device, which does not require any external energy input, provides great ease of handling in handling, since it allows them to descend very gently onto its location. . This device can be built in different sizes, diameters, strokes and shapes as well as for different load values. Its operation is reliable and it supports the shocks inevitably resulting from its use.

Claims (11)

1. Dispositif de suspension d'une charge à un appareil de levage comportant un ensemble cylin­dre-piston dont chacune des parties, le cylindre et le piston, sont pourvues de moyens d'accrochage permettant de les accrocher l'une à l'appareil de levage et l'au­tre à la charge, et comportant en outre un moyen de communication à étranglement réglable entre les deux extrémités du cylindre de manière que sous l'effet de la charge, un fluide incompressible occupant le cylin­dre s'écoule par l'étranglement avec un débit réglé, réglant ainsi un déplacement à vitesse constante du piston dans le cylindre, caractérisé en ce que le pis­ton comporte un disque de piston solidaire de deux seg­ments de tige coaxiaux et en ce que le cylindre présen­te deux flasques d'extrémité munis chacun d'une ouver­ture de guidage, chaque tige de piston traversant une de ces ouvertures de manière à réaliser un guidage étanche assurant un déplacement relatif parfaitement coaxial entre le cylindre et le piston.1. A device for suspending a load from a lifting device comprising a cylinder-piston assembly, each of the parts of which, the cylinder and the piston, are provided with hooking means enabling them to be hooked one to the lifting and the other to the load, and further comprising a means of communication with adjustable throttle between the two ends of the cylinder so that under the effect of the load, an incompressible fluid occupying the cylinder flows through the throttle with a regulated flow rate, thus regulating a displacement at constant speed of the piston in the cylinder, characterized in that the piston comprises a piston disc integral with two coaxial rod segments and in that the cylinder has two end flanges each provided a guide opening, each piston rod passing through one of these openings so as to produce a sealed guide ensuring a perfectly coaxial relative movement between the cylinder and the piston. 2. Dispositif de suspension selon la revendi­cation 1, caractérisé en ce que des moyens de réglage de débit sont constitués par une vis à pointeau capable de s'engager partiellement dans un segment de forure faisant partie des moyens de communication de manière que l'étranglement soit défini par le pointeau de la vis et la paroi du segment de forure.2. Suspension device according to claim 1, characterized in that the flow adjustment means are constituted by a needle screw capable of partially engaging in a bore segment forming part of the communication means so that the throttle is defined by the screw needle and the wall of the drilling segment. 3. Dispositif de suspension selon les revendi­cations 1 ou 2, caractérisé en ce que les ouvertures de guidage des deux flasques comportent chacun un alésage ajusté à un des segments de tige et une ou plusieurs gorges annulaires débouchant dans l'alésage et munies d'anneaux d'étanchéité.3. Suspension device according to claims 1 or 2, characterized in that the guide openings of the two flanges each have a bore adjusted to one of the rod segments and one or more annular grooves opening into the bore and provided sealing rings. 4. Dispositif de suspension selon l'une des revendications 1 à 3, caractérisé en ce qu'il comporte un moyen de rappel tendant à ramener le piston dans une position initiale, au contact d'un des flasques, en l'absence de charge sur le moyen d'accrochage correspondant.4. Suspension device according to one of claims 1 to 3, characterized in that it comprises a return means tending to return the piston to an initial position, in contact with one of the flanges, in the absence of load on the corresponding attachment means. 5. Dispositif selon la revendication 4, carac­térisé en ce que le moyen de rappel est un ressort placé entre le piston et un des flasques et en ce qu'un passage à grand débit, obturé par une soupape et per­mettant un rappel rapide du piston dans la dite position initiale est prévu dans le disque de piston.5. Device according to claim 4, characterized in that the return means is a spring placed between the piston and one of the flanges and in that a high-flow passage, closed by a valve and allowing a rapid return of the piston in said initial position is provided in the piston disc. 6. Dispositif selon la revendication 5, carac­térisé en ce que la soupape est constituée par un man­chon monté sur celui des segments de tige qui traverse l'espace occupé par le ressort de rappel, ce manchon étant lui-même sollicité par un ressort relié au dit segment de tige, ce manchon obturant une ou plusieurs forures qui traversent le piston et forment ensemble le dit passage à grand débit.6. Device according to claim 5, characterized in that the valve consists of a sleeve mounted on that of the rod segments which crosses the space occupied by the return spring, this sleeve itself being biased by a spring connected to the said rod segment, this sleeve closing one or more holes which pass through the piston and together form the said passage at high flow rate. 7. Dispositif de suspension selon la revendi­cation 1, caractérisé en ce que le piston est muni d'un joint d'étanchéité constitué de deux éléments: un joint torique (23) et un joint annulaire à section rectangu­laire (24).7. Suspension device according to claim 1, characterized in that the piston is provided with a seal consisting of two elements: an O-ring (23) and an annular seal with rectangular section (24). 8. Dispositif de suspension selon la revendi­cation 1, caractérisé en ce que les moyens de communi­cation comportent deux conduits distincts mnis d'étran­glements réglables, l'un d'eux étant agencé de manière à permettre l'installation d'une commande à distance.8. Suspension device according to claim 1, characterized in that the communication means comprise two separate conduits provided with adjustable throttles, one of them being arranged so to allow the installation of a remote control. 9. Dispositif de suspension selon la revendi­cation 8, caractérisé en ce que les moyens de réglage fin de débit du fluide sont réalisés sur les deux con­duits de communication à l'aide de vis pointeau.9. Suspension device according to claim 8, characterized in that the means for fine adjustment of the fluid flow rate are produced on the two communication conduits using needle screws. 10. Dispositif de suspension selon la revendi­cation 1, caractérisé en ce qu'un orifice communiquant avec la chambre principale est prévu afin d'y connecter un manomètre indiquant la force exercée par la charge suspendue.10. Suspension device according to claim 1, characterized in that an orifice communicating with the main chamber is provided in order to connect a pressure gauge indicating the force exerted by the suspended load. 11. Revendication sans priorité
Dispositif selon la revendication 2, caracté­risé en ce que les dits moyens de communication compor­tent un corps de robinet, une poignée solidaire de ce corps, un logement ouvert dans une surface extérieure du cylindre, un premier conduit et un second conduit partiels débouchant tous deux dans le dit logement, le dit segment de forure étant ménagé dans le corps de ro­binet, et ce dernier étant équipé de la vis à pointeau et monté dans le logement de manière que dans une posi­tion de la poignée il ouvre le moyen de communication et assure un débit réglé dans l'étranglement alors que l'autre position de la poignée ferme le moyen de communication.11. Claim without priority
Device according to claim 2, characterized in that said means of communication comprise a valve body, a handle integral with this body, an open housing in an external surface of the cylinder, a first conduit and a second partial conduit both opening into said housing, said drilling segment being formed in the valve body, and the latter being equipped with the needle screw and mounted in the housing so that in a position of the handle it opens the means of communication and ensures a flow rate set in the throttle while the other position of the handle closes the means of communication.
EP89810190A 1988-03-24 1989-03-10 Device for suspending loads from a hoist Withdrawn EP0334808A1 (en)

Applications Claiming Priority (2)

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CH1107/88 1988-03-24
CH1107/88A CH681005A5 (en) 1988-03-24 1988-03-24

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EP89810190A Withdrawn EP0334808A1 (en) 1988-03-24 1989-03-10 Device for suspending loads from a hoist

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EP (1) EP0334808A1 (en)
CH (1) CH681005A5 (en)

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FR2885610B1 (en) * 2005-05-12 2009-01-16 Airbus France Sas SLEEPING DEVICE WITH EFFORT COMPENSATION AND LIFT SYSTEM COMPRISING SAME
CA2765189C (en) * 2009-06-22 2017-01-10 Aoki Machinery Co., Ltd. Lifting hook device
CN107200269B (en) * 2017-06-30 2018-10-19 江苏永钢集团有限公司 The tipple tumbled for liquid metal packet
US11608251B1 (en) 2021-01-20 2023-03-21 United States Of America As Represented By The Administrator Of Nasa Pneumatically adjustable lifting apparatus

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DE941021C (en) * 1954-08-21 1956-03-29 Karl Oehlmann Load hook for hoists with fine adjustment device
US2860908A (en) * 1956-04-12 1958-11-18 Walter R Peterson Hydraulic material handling apparatus
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AU637243B2 (en) * 1990-07-26 1993-05-20 Pujol Y Tarrago, S.A. Hydraulic self-adjusting device for control cables of clutches
US5265710A (en) * 1990-07-26 1993-11-30 Pujol Y Tarrago S.A. Hydraulic self-adjusting device for clutch control cables

Also Published As

Publication number Publication date
CH681005A5 (en) 1992-12-31
US4930828A (en) 1990-06-05

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