EP0037298A1 - Step-by-step jack with safety device - Google Patents

Step-by-step jack with safety device Download PDF

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Publication number
EP0037298A1
EP0037298A1 EP81400356A EP81400356A EP0037298A1 EP 0037298 A1 EP0037298 A1 EP 0037298A1 EP 81400356 A EP81400356 A EP 81400356A EP 81400356 A EP81400356 A EP 81400356A EP 0037298 A1 EP0037298 A1 EP 0037298A1
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EP
European Patent Office
Prior art keywords
clamps
detection member
winch according
support
pliers
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.)
Ceased
Application number
EP81400356A
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German (de)
French (fr)
Inventor
Bernard Fougea
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Coignet SA
Original Assignee
Coignet SA
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Filing date
Publication date
Application filed by Coignet SA filed Critical Coignet SA
Publication of EP0037298A1 publication Critical patent/EP0037298A1/en
Ceased legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/06—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
    • E04G11/20—Movable forms; Movable forms for moulding cylindrical, conical or hyperbolical structures; Templates serving as forms for positioning blocks or the like
    • E04G11/22—Sliding forms raised continuously or step-by-step and being in contact with the poured concrete during raising and which are not anchored in the hardened concrete; Arrangements of lifting means therefor
    • E04G11/24—Construction of lifting jacks or climbing rods for sliding forms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F1/00—Devices, e.g. jacks, for lifting loads in predetermined steps
    • B66F1/02—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts
    • B66F1/025—Devices, e.g. jacks, for lifting loads in predetermined steps with locking elements, e.g. washers, co-operating with posts the devices being operated by fluid pressure

Definitions

  • the present invention relates to a winch with stepping drive with safety device, this winch being of the type in which a cable or other traction support is actuated relative to two sets of clamps, one of which is fixed relative to a reference location and the other mobile, the clamps of one of the sets must be in a tight position against the cable or support while those of the other set are in the released position while the two sets are distant from one the other under the action of motor means such as at least one jack, the clamps initially tightened then being placed in the released position and the clamps initially released having to be in the clamped position while the two games are brought together. 'other under the action of said motor means.
  • Winches of this type such as gripper elevators are commonly used in construction techniques, but their operation can be seriously disturbed if, as a result of an incident, the two sets of grippers are simultaneously in the released position , if only for a short time; in this case, the downward movement of the cable or support can occur quickly and suddenly with extremely serious consequences.
  • these winches include safety devices preventing any beginning of loosening of a set of pliers until the other set is not perfectly tight; these safety devices are generally operated in function tion of the fluid pressure in pre-tightening cylinders against the cable secured to at least one of the sets of clamps; this results in an indication of pressure, and, only if there is pressure, the clamps to be released are actuated; however, it may happen that an anomaly occurs in the operation of the pre-tightening cylinders, causing the loosening of one set of pliers while the other is not yet fully tightened.
  • the object of the present invention is to remedy this drawback and for this purpose relates to a winch with stepping drive with safety device, of the type according to which a traction support such as a cable is actuated by a first set of movable pliers relative to a second set of clamps fixed relative to a reference location, one of the sets of clamps being tightened against the traction support and the other loosened during the separation of the two sets, the set tightened and the set loosened during their distance from each other being respectively loosened and tightened during their approaching winch characterized in that at least one set of clamps is provided with a safety device comprising at least one member for detecting movement of the support of traction to detect any movement of the latter at the level of this clearance when said clearance should be tightened, and a closure release member cooperating with the scroll detection member to then tighten the other j had pliers.
  • the elevator-tractor described here and intended to raise a cable A comprises for this purpose two closing members 1, 2 for clamps 3, 4,. Placed at a certain distance one above the other, between which are inserted said respective clamps 3, 4 formed in the form of corners and arranged around the cable A so as to be capable of coming against it in the clamped position, or to pass into the loosened position.
  • the clamped or loosened position is obtained thanks to the "wedge" effect caused by the cooperation of inclined surfaces provided respectively inside the closing members 1, 2 and outside of the clamps 3, 4.
  • the lower closure member 2 is assumed to be fixed relative to a frame not shown, the upper closure member 1 being made movable relative to it by at least one hydraulic or pneumatic cylinder (also not represented).
  • the two sets of closure members 1, 2 and clamps 3, 4 are in the clamped position, the cylinder being in the retracted position so that these games are relatively close to each other ;
  • FIG. 2 shows a phase during which, the jacks being in extension, the lower clearance 2, 4 is in the released position, and the upper clearance 1, 3 in the tight position, which causes the rope to rise in relation at the lower clearance 2, 4 therefore with respect to the frame;
  • FIG. 1 shows a phase during which, the jacks being in extension, the lower clearance 2, 4 is in the released position, and the upper clearance 1, 3 in the tight position, which causes the rope to rise in relation at the lower clearance 2, 4 therefore with respect to the frame;
  • FIG. 3 again shows the two sets of closing members 1, 2 and of clamps 3, 4 in the tight position, the jack being this time in the extended position, so that these games are in their position of maximum separation ;
  • FIG. 4 shows the phase during which the jack is in retraction, the lower clearance 2, 4 is in the clamped position and the upper clearance 1, 3 in the released position, so that the latter returns to its initial position from the FIG. 1, the cable A being held in position by virtue of the lower clearance 2, 4.
  • Pre-tightening cylinders giving an indication of pressure and allowing, if there is pressure on a set of pliers, therefore in principle tightening against the cable A, to loosen the other set of pliers, are not shown.
  • the safety device shown in FIGS. 5 to 8 is intended, in the event of false information given by the pre-tightening cylinders, to stop the running of the cable A between the sets of pliers 3, 4; for this purpose, provision is made to detect any movement of the cable by reference to the set of pliers assumed to be closed in order to trigger the closing of the second set of pliers (that is to say of the one which has just opened) and to stop the cable run.
  • the lift-tractor the operation of which has been described above, comprises at least one safety device of this type, for example one or more devices on each set of pliers.
  • This device comprises, in a housing 11, a feeler 12 intended to come into contact with the cable A, secured to a substantially horizontal lever 13 fixed to the upper part of one or more deformable supports 14, for example made of neoprene, carried by said housing 11.
  • the housing 11 also carries, under the lever 13, a switch 15 (here a micro-switch) provided with a pressure contact 151 at its upper part.
  • the probe 12 is constituted by a jaw having a partially cylindrical surface, opposite the cable A, of the same radius as that of this cable.
  • This jaw is positioned so that when the corresponding clamp is in the released position ( Figure 6) or even in the clamped position ( Figure 7) without cable running, the generatrix of its cylindrical surface is slightly inclined relative to the longitudinal axis of the cable, the lever 13 is horizontal, and the deformable support is not deformed (or is slightly deformed, in the tight position), the force exerted on it being only radial; on the other hand, the positioning is such that in the tight position with the cable A running ( Figure 8), the cylindrical surface of the jaw is almost entirely in contact with that of the cable A under the action of the movement of the cable, the lever 13 being inclined downwards towards of said cable, the support 14 being deformed, the inclination of the lever 13 being such that the contact 151 of the breaker 15 is pressed and maintained in this position by said lever 13.
  • the breaker 15 being inserted in an appropriate circuit, the information corresponding to the fact that it is pressed is transmitted to the clamp closing members, causing the closure of the other set of pliers, which had just opened.
  • the stroke of the lever 13 is limited by a stop 16, in order to avoid the crushing of the breaker 15 or any deformation of the housing 11 and the tearing of the deformable support 14.
  • the lever 13 is formed under the shape of a rectangular plate, and two deformable supports 14 are provided to fix this lever 13.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Electric Cable Installation (AREA)
  • Mechanical Control Devices (AREA)

Abstract

The invention relates to a step-by-step jack with safety device, in which a traction support such as a cable (A) is actuated by a set of clamps which is mobile relative to a set of clamps fixed at a reference position, one of the two sets of clamps being clamped against the traction support and the other unclamped while the two sets are being moved apart, and conversely while they are being moved together. The jack is characterised in that at least one set of clamps is provided with a safety device possessing a detection member (12) for detecting any movement of the traction support at the level of this set while the latter should be clamped, and a closure trigger member (15) for clamping the other set of clamps in this situation. The invention may be used in construction techniques. <IMAGE>

Description

La présente invention concerne un treuil à entraînement pas à pas à dispositif de sécurité, ce treuil étant du type dans lequel un câble ou un autre support de traction est actionné par rapport à deux jeux de pinces dont l'un est fixe par rapport à un emplacement de référence et l'autre mobile, les pinces de l'un des jeux devant être en position serrée contre le câble ou support tandis que celles de l'autre jeu sont en position desserrée pendant que les deux jeux sont éloignés l'un de l'autre sous l'action de moyens moteurs tels qu'au moins un vérin, les pinces initialement serrées étant ensuite mises en position desserrée et les pinces initialement desserrées devant être en position serrée pendant que les deux jeux sont rapporchés l'un de l'autre sous l'action desdits moyens moteurs.The present invention relates to a winch with stepping drive with safety device, this winch being of the type in which a cable or other traction support is actuated relative to two sets of clamps, one of which is fixed relative to a reference location and the other mobile, the clamps of one of the sets must be in a tight position against the cable or support while those of the other set are in the released position while the two sets are distant from one the other under the action of motor means such as at least one jack, the clamps initially tightened then being placed in the released position and the clamps initially released having to be in the clamped position while the two games are brought together. 'other under the action of said motor means.

Les treuils de ce type, tels que les élévateurs-tracteurs à pinces sont couramment utilisés dans les techniques de construction, mais leur fonctionnement peut être gravement perturbé si, par suite d'un incident, les deux jeux de pinces se trouvent simultanément en position desserrée, ne serait-ce qu'un court instant ; dans ce cas, le défilement du câble ou support vers le bas peut survenir rapidement et brutalement avec des conséquences extrêmement graves.Winches of this type, such as gripper elevators are commonly used in construction techniques, but their operation can be seriously disturbed if, as a result of an incident, the two sets of grippers are simultaneously in the released position , if only for a short time; in this case, the downward movement of the cable or support can occur quickly and suddenly with extremely serious consequences.

Aussi, ces treuils comportent des dispositifs de sécurité empêchant tout commencement de desserrage d'un jeu de pinces tant que l'autre jeu n'est pas parfaitement serré ; ces dispositifs de sécurité sont en général actionnés en fonction de la pression de fluide dans des vérins de pré-serrage contre le câble solidaires d'au moins l'un des jeux de pinces; il en résulte une indication de pression, et, seulement s'il y a pression, les pinces à desserrer sont actionnées ; néanmoins, il peut arriver que survienne une anomalie dans le fonctionnement des vérins de pré-serrage, provoquant le desserrage d'un jeu de pinces alors que l'autre n'est pas encore parfaitement serré.Also, these winches include safety devices preventing any beginning of loosening of a set of pliers until the other set is not perfectly tight; these safety devices are generally operated in function tion of the fluid pressure in pre-tightening cylinders against the cable secured to at least one of the sets of clamps; this results in an indication of pressure, and, only if there is pressure, the clamps to be released are actuated; however, it may happen that an anomaly occurs in the operation of the pre-tightening cylinders, causing the loosening of one set of pliers while the other is not yet fully tightened.

La présente invention a pour but de remédier à cet inconvénient et concerne à cet effet un treuil à entraînement pas à pas à dispositif de sécurité, du type selon lequel un support de traction tel qu'un câble est actionné par un premier jeu de pinces mobile par rapport à un second jeu de pinces fixe par rapport à un emplacement de référence, l'un des jeux de pinces étant serré contre le support de traction et l'autre desserré pendant l'éloignement des deux jeux, le jeu serré et le jeu desserré pendant leur éloignement l'un de l'autre étant respectivement desserré et serré pendant leur rapprochement treuil caractérisé en ce qu'au moins un jeu de pinces est muni d'un dispositif de sécurité comportant au moins un organe de détection de défilement du support de traction pour détecter tout défilement de çelui-ci au niveau de ce jeu alors que ledit jeu devrait être serré, et un organe de déclenchement de fermeture coopérant avec l'organe de détection de défilement pour serrer alors l'autre jeu de pinces. Grâce à ce dispositif, si un défilement de la corde ou support survient par suite par exemple du desserrage simultané des deux jeux de pinces, l'un des jeux peut être immédiatement resserré, empêchant ainsi la poursuite du défilement.The object of the present invention is to remedy this drawback and for this purpose relates to a winch with stepping drive with safety device, of the type according to which a traction support such as a cable is actuated by a first set of movable pliers relative to a second set of clamps fixed relative to a reference location, one of the sets of clamps being tightened against the traction support and the other loosened during the separation of the two sets, the set tightened and the set loosened during their distance from each other being respectively loosened and tightened during their approaching winch characterized in that at least one set of clamps is provided with a safety device comprising at least one member for detecting movement of the support of traction to detect any movement of the latter at the level of this clearance when said clearance should be tightened, and a closure release member cooperating with the scroll detection member to then tighten the other j had pliers. With this device, if a scrolling of the rope or support occurs as a result, for example, of the simultaneous loosening of the two sets of pliers, one of the sets can be immediately tightened, thus preventing further scrolling.

Les caractéristiques et avantages de l'invention ressortiront d'ailleurs de la description qui va suivre, en référence aux dessins annexés dans lesquels :

  • les figures 1 à 4 représentent schématiquement les phases successives de l'élévation d'un câble à l'aide d'un élévateur-tracteur ;
  • la figure 5 est une vue schématique de dessus d'un dispositif de sécurité équipant un treuil, tel qu'un élévateur-tracteur, selon l'invention ;
  • les figures 6 à 8 sont des vues en coupe de profil du dispositif de la figure 5, dans divers cas de fonctionnement.
The characteristics and advantages of the invention will become apparent from the description which follows, with reference to the accompanying drawings in which:
  • Figures 1 to 4 schematically represent the successive phases of the elevation of a cable using a lift-tractor;
  • Figure 5 is a schematic top view of a safety device fitted to a winch, such as an eleva tractor tractor according to the invention;
  • Figures 6 to 8 are sectional side views of the device of Figure 5, in various cases of operation.

L'élévateur-tracteur ici décrit et destiné à élever un câble A comporte à cet effet deux organes de fermeture 1, 2 pour des pinces 3, 4,.placés à une certaine distance l'un au-dessus de l'autre, entre lesquels sont insérées lesdites pinces 3, 4 respectives constituées sous forme de coins et disposées autour du câble A afin d'être susceptibles de venir contre lui en position serrée, ou de passer en position desserrée. La position serrée ou desserrée est obtenue grâce à l'effet "de coin" provoqué par la coopération de surfaces inclinées prévues respectivement à l'intérieur des organes de fermeture 1, 2 et à l'extérieur des pinces 3, 4.The elevator-tractor described here and intended to raise a cable A comprises for this purpose two closing members 1, 2 for clamps 3, 4,. Placed at a certain distance one above the other, between which are inserted said respective clamps 3, 4 formed in the form of corners and arranged around the cable A so as to be capable of coming against it in the clamped position, or to pass into the loosened position. The clamped or loosened position is obtained thanks to the "wedge" effect caused by the cooperation of inclined surfaces provided respectively inside the closing members 1, 2 and outside of the clamps 3, 4.

Dans l'exemple choisi, l'organe de fermeture inférieur 2 est supposé fixe par rapport à un bâti non représenté, l'organe de fermeture supérieur 1 étant rendu mobile par rapport à lui grâce à au moins un vérin hydraulique ou pneumatique (également non représenté). Sur la figure 1, les deux jeux d'organes de fermeture 1, 2 et de pinces 3, 4 sont en position serrée, le vérin étant en position rétractée de telle sorte que.ces jeux soient relativement proches l'un de l'autre ; la figure 2 montre une phase au cours de laquelle, les vérins étant en extension, le jeu inférieur 2, 4 est en position desserrée, et le jeu supérieur 1, 3 en position serrée, ce qui entraîne l'élévation de la corde par rapport au jeu inférieur 2, 4 donc par rapport au bâti ; la figure 3 représente à nouveau les deux jeux d'organes de fermeture 1, 2 et de pinces 3, 4 en position serrée, le vérin étant cette fois en position allongée, de telle sorte que ces jeux soient dans leur position d'éloignement maximal ; la figure 4 montre la phase au cours de laquelle le vérin étant en rétraction, le jeu inférieur 2, 4 est en position serrée et le jeu supérieur 1, 3 en position desserrée, de telle sorte que ce dernier revient à sa position initiale de la figure 1, le câble A étant maintenu en position grâce au jeu inférieur 2, 4.In the example chosen, the lower closure member 2 is assumed to be fixed relative to a frame not shown, the upper closure member 1 being made movable relative to it by at least one hydraulic or pneumatic cylinder (also not represented). In Figure 1, the two sets of closure members 1, 2 and clamps 3, 4 are in the clamped position, the cylinder being in the retracted position so that these games are relatively close to each other ; FIG. 2 shows a phase during which, the jacks being in extension, the lower clearance 2, 4 is in the released position, and the upper clearance 1, 3 in the tight position, which causes the rope to rise in relation at the lower clearance 2, 4 therefore with respect to the frame; FIG. 3 again shows the two sets of closing members 1, 2 and of clamps 3, 4 in the tight position, the jack being this time in the extended position, so that these games are in their position of maximum separation ; FIG. 4 shows the phase during which the jack is in retraction, the lower clearance 2, 4 is in the clamped position and the upper clearance 1, 3 in the released position, so that the latter returns to its initial position from the FIG. 1, the cable A being held in position by virtue of the lower clearance 2, 4.

Les vérins de pré-serrage donnant une indication de pression et permettant, s'il y a pression sur un jeu de pinces, donc en principe serrage contre le câble A, de desserrer l'autre jeu de pinces, ne sont pas représentés.Pre-tightening cylinders giving an indication of pressure and allowing, if there is pressure on a set of pliers, therefore in principle tightening against the cable A, to loosen the other set of pliers, are not shown.

Le dispositif de sécurité représenté sur les figures 5 à 8 est destiné, en cas de fausse information donnée par les vérins de pré-serrage, à arrêter le défilement du câble A entre les jeux de pinces 3, 4 ; à cet effet, il est prévu de détecter tout défilement du câble par rappport au jeu de pinces supposé fermé pour déclencher la fermeture du deuxième jeu de pinces (c'est-à-dire de celui qui vient de s'ouvrir) et arrêter le défilement du câble. L'élévateur-tracteur, dont le fonctionnement a été exposé plus haut, comporte au moins un dispositif de sécurité de ce type, par exemple un ou plusieurs dispositifs sur chaque jeu de pinces.The safety device shown in FIGS. 5 to 8 is intended, in the event of false information given by the pre-tightening cylinders, to stop the running of the cable A between the sets of pliers 3, 4; for this purpose, provision is made to detect any movement of the cable by reference to the set of pliers assumed to be closed in order to trigger the closing of the second set of pliers (that is to say of the one which has just opened) and to stop the cable run. The lift-tractor, the operation of which has been described above, comprises at least one safety device of this type, for example one or more devices on each set of pliers.

Ce dispositif comporte, dans un boîtier 11, un palpeur 12 destiné à venir au contact du cable A, solidarisé à un levier 13 sensiblement horizontal fixé à la partie supérieure d'un ou plusieurs appuis déformables 14, par exemple en néoprène, portés par ledit boîtier 11. Le boîtier 11 porte également, sous le levier 13, un rupteur 15 (ici un micro- rupteur) muni d'un contact à pression 151 à sa partie supé- riéure.This device comprises, in a housing 11, a feeler 12 intended to come into contact with the cable A, secured to a substantially horizontal lever 13 fixed to the upper part of one or more deformable supports 14, for example made of neoprene, carried by said housing 11. The housing 11 also carries, under the lever 13, a switch 15 (here a micro-switch) provided with a pressure contact 151 at its upper part.

Dans le cas de l'exemple décrit, le palpeur 12 est constitué par une mâchoire présentant une surface partiellement cylindrique, en regard du câble A, de même rayon que celui de ce câble. Cette mâchoire est positionnée de telle sorte que lorsque la pince correspondante est en position desserrée (Figure 6) ou même en position serrée (Figure 7) sans défilement du câble, la génératrice de sa surface cylindrique soit légèrement inclinée par rapport à l'axe longitudinal du câble, le levier 13 soit horizontal, et l'appui déformable ne soit pas déformé (ou soit peu déformé, en position serrée), l'effort exercé sur lui étant uniquement radial ; par contre,le positionnement est tel qu'en position serrée avec défilement du câble A (Figure 8), la surface cylindrique de la mâchoire soit dans sa quasi totalité au contact de celle du câble A sous l'action du mouvement du câble, le levier 13 étant incliné vers le bas en direction dudit câble, l'appui 14 étant déformé, l'inclinaison du levier 13 étant telle que le contact 151 du rupteur 15 soit enfoncé et maintenu dans cette position par ledit levier 13. Le rupteur 15 étant inséré dans un circuit approprié, l'information correspondant au fait qu'il est enfoncé est transmise aux organes de fermeture des pinces, entraînant la fermeture de l'autre jeu de pinces, qui venait de s'ouvrir. La course du levier 13 est limitée par une butée 16, afin d'éviter l'écrasement du rupteur 15 ou toute déformation du boîtier 11 et l'arrachement de l'appui déformable 14. Dans le cas présent, le levier 13 est constitué sous la forme d'une plaque rectangulaire, et deux appuis déformables 14 sont prévus pour y fixer ce levier 13. Ainsi, les pinces étant en position desserrée (Figure 6), la mâchoire 12 n'est pas en contact avec le câble A, le levier 13 est en position de repos (horizontale) sous l'action des appuis 14, et le contact 151 du rupteur 15 est sorti ; en position serrée sans défilement (Figure 7) la mâchoire 12 arrive au contact du câble A, mais la force qui s'exerce sur elle et, par conséquent, sur les appuis 14 est sensiblement horizontale, et, le levier 13 étant toujours horizontal, le contact 151 est encore sorti ; si la bande se met à défiler, une force dirigée vers le bas s'exerce sur la mâchoire 12, les appuis 14 se déforment notablement sous l'action du levier 13, et celui-ci entraîne également l'enfoncement du contact 151, provoquant le resserrement de l'autre pince et très rapidement l'immobilisation du câble A, sans autre dommage.In the case of the example described, the probe 12 is constituted by a jaw having a partially cylindrical surface, opposite the cable A, of the same radius as that of this cable. This jaw is positioned so that when the corresponding clamp is in the released position (Figure 6) or even in the clamped position (Figure 7) without cable running, the generatrix of its cylindrical surface is slightly inclined relative to the longitudinal axis of the cable, the lever 13 is horizontal, and the deformable support is not deformed (or is slightly deformed, in the tight position), the force exerted on it being only radial; on the other hand, the positioning is such that in the tight position with the cable A running (Figure 8), the cylindrical surface of the jaw is almost entirely in contact with that of the cable A under the action of the movement of the cable, the lever 13 being inclined downwards towards of said cable, the support 14 being deformed, the inclination of the lever 13 being such that the contact 151 of the breaker 15 is pressed and maintained in this position by said lever 13. The breaker 15 being inserted in an appropriate circuit, the information corresponding to the fact that it is pressed is transmitted to the clamp closing members, causing the closure of the other set of pliers, which had just opened. The stroke of the lever 13 is limited by a stop 16, in order to avoid the crushing of the breaker 15 or any deformation of the housing 11 and the tearing of the deformable support 14. In the present case, the lever 13 is formed under the shape of a rectangular plate, and two deformable supports 14 are provided to fix this lever 13. Thus, the clamps being in the released position (Figure 6), the jaw 12 is not in contact with the cable A, the lever 13 is in the rest position (horizontal) under the action of the supports 14, and the contact 151 of the switch 15 is out; in the clamped position without scrolling (FIG. 7) the jaw 12 comes into contact with the cable A, but the force exerted on it and, consequently, on the supports 14 is substantially horizontal, and, the lever 13 being always horizontal, contact 151 is still out; if the strip begins to run, a force directed downwards is exerted on the jaw 12, the supports 14 are deformed notably under the action of the lever 13, and the latter also causes the depression of the contact 151, causing the tightening of the other clamp and very quickly the immobilization of the cable A, without further damage.

Bien entendu, l'invention n'est pas limitée à la forme de réalisation ci-dessus décrite et représentée, à titre d'exemple, et on pourra prévoir d'autres formes de réalisation, par exemple des treuils munis de dispositifs de sécurité mécaniques, électriques, électroniques, magnétiques, pneumatiques, ou hydrauliques, sans pour autant sortir du cadre de l'invention.Of course, the invention is not limited to the embodiment described above and shown, by way of example, and provision may be made for other embodiments, for example winches provided with mechanical safety devices. , electric, electronic, magnetic, pneumatic, or hydraulic, without departing from the scope of the invention.

Claims (9)

1. Treuil à entraînement pas à pas à dispositif de sécurité, du type selon lequel un support de traction tel qu'un câble (A) est actionné par un premier jeu de pinces (3), mobile par rapport à un second jeu de pinces (4) fixe par rapport à un emplacement de référence, l'un des jeux de pinces étant serré contre le support de traction (A) et l'autre desserré pendant l'éloignement des deux jeux (3, 4), le jeu serré et le jeu desserré pendant leur éloignement l'un de l'autre étant respectivement desserré et serré pendant leur rapprochement, treuil caractérisé en ce qu'au moins un jeu de pinces (3, 4) est muni d'un dispositif de sécurité comportant au moins un organe de détection de défilement (12) du support de traction (A) pour détecter tout défilement de celui-ci au niveau de ce jeu alors que ledit jeu devrait être serré, et un organe de déclenchement de fermeture (15) coopérant avec l'organe de détection de défilement pour serrer alors l'autre jeu de pinces (4, 3).1. Winch with stepping drive with safety device, of the type according to which a traction support such as a cable (A) is actuated by a first set of pliers (3), movable relative to a second set of pliers (4) fixed relative to a reference location, one of the sets of pliers being tightened against the traction support (A) and the other loosened during the separation of the two sets (3, 4), the set tightened and the game released during their distance from one another being respectively released and tightened during their approach, winch characterized in that at least one set of clamps (3, 4) is provided with a safety device comprising at less a movement detection member (12) of the traction support (A) for detecting any movement of the latter at this clearance when said clearance should be tightened, and a closure release member (15) cooperating with the scroll detection member to then tighten the other set of pliers (4, 3). 2. Treuil selon la revendication 1, caractérisé en ce qu'il comporte deux dispositifs de sécurité solidaires chacun d'un jeu de pinces (3, 4).2. Winch according to claim 1, characterized in that it comprises two safety devices each secured to a set of clamps (3, 4). 3. Treuil selon l'une quelconque des revendications 1, 2, caractérisé en ce qu'il comporte au moins un dispositif de sécurité électromécanique où l'organe de détection de défilement (12) est entraîné mécaniquement sous l'action du défilement du support de traction (A), et où l'organe de déclenchement de la fermeture (15) est un rupteur dont le contact (151) est actionné lors du mouvement de l'organe de détection (12).3. Winch according to any one of claims 1, 2, characterized in that it comprises at least one electromechanical safety device where the scroll detection member (12) is mechanically driven under the action of the scrolling of the support traction (A), and where the shutter release member (15) is a breaker whose contact (151) is actuated during the movement of the detection member (12). 4. Treuil selon la revendication 3, caractérisé en ce que l'organe de détection de défilement (12) est relié à un levier (13) porté par au moins un appui déformable (14) solidaire du jeu de pinces (3, 4), ce levier (13) actionnant le contact (151) du rupteur (15) lors du mouvement de l'organe de détection (12).4. Winch according to claim 3, characterized in that the scroll detection member (12) is connected to a lever (13) carried by at least one deformable support (14) secured to the set of clamps (3, 4) , this lever (13) actuating the contact (151) of the breaker (15) during the movement of the detection member (12). 5. Treuil selon la revendication 4, caractérisé en ce que l'appui déformable (14) est solidaire du jeu de pinces (3, 4) par l'intermédiaire d'un boîtier (11) portant également le rupteur (15).5. Winch according to claim 4, characterized in that the deformable support (14) is integral with the set of clamps (3, 4) via a housing (11) also carrying the breaker (15). 6. Treuil selon l'une quelconque des revendications 4, 5, caractérisé en ce que le rupteur (15) est positionné sous le levier (13).6. Winch according to any one of claims 4, 5, characterized in that the breaker (15) is positioned under the lever (13). 7. Treuil selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'organe de détection de défilement (12) est une mâchoire présentant une surface partiellement cylindrique en regard du support de traction (A).7. Winch according to any one of claims 1 to 6, characterized in that the running detection member (12) is a jaw having a partially cylindrical surface opposite the traction support (A). 8. Treuil selon l'une quelconque des revendications 6, 7, caractérisé en ce que la mâchoire (1-2) est entraînée dans le sens du défilement du support de traction (A), sa surface partiellement cylindrique ayant alors sa génératrice disposée parallèlement à la direction du défilement.8. Winch according to any one of claims 6, 7, characterized in that the jaw (1-2) is driven in the direction of travel of the traction support (A), its partially cylindrical surface then having its generatrix arranged in parallel to the direction of scrolling. 9. Treuil selon l'une quelconque des revendications 3 à 8, caractérisé en ce que le mouvement de l'organe de détection de défilement (12) est limité par une butée (16).9. Winch according to any one of claims 3 to 8, characterized in that the movement of the scroll detection member (12) is limited by a stop (16).
EP81400356A 1980-03-20 1981-03-09 Step-by-step jack with safety device Ceased EP0037298A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8006190 1980-03-20
FR8006190A FR2478612A1 (en) 1980-03-20 1980-03-20 WINCH NOT TRAINING WITH A SECURITY DEVICE

Publications (1)

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EP0037298A1 true EP0037298A1 (en) 1981-10-07

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EP81400356A Ceased EP0037298A1 (en) 1980-03-20 1981-03-09 Step-by-step jack with safety device

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EP (1) EP0037298A1 (en)
FR (1) FR2478612A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB838373A (en) * 1957-07-05 1960-06-22 Edouard Dubois Improvements in or relating to means for controlling jacks for moving sliding moulds
US2944403A (en) * 1953-09-04 1960-07-12 Raymond Int Inc Hydraulic jacking assembly for marine platforms
FR1320847A (en) * 1962-01-31 1963-03-15 Improvements in level control of slip formwork jacks
US3247930A (en) * 1964-03-31 1966-04-26 Dresser Ind Crane cab safety brake
US3250402A (en) * 1964-03-17 1966-05-10 Dresser Ind Safety brake
US3685801A (en) * 1969-12-22 1972-08-22 Ahlgren Nils H Jack assemblies
FR2257044A1 (en) * 1974-01-09 1975-08-01 Mediterranee Const Navales Ind Safety stop for lift or escalator - has rack oscillating cranked sprung lever to rack locking position

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2944403A (en) * 1953-09-04 1960-07-12 Raymond Int Inc Hydraulic jacking assembly for marine platforms
GB838373A (en) * 1957-07-05 1960-06-22 Edouard Dubois Improvements in or relating to means for controlling jacks for moving sliding moulds
FR1320847A (en) * 1962-01-31 1963-03-15 Improvements in level control of slip formwork jacks
US3250402A (en) * 1964-03-17 1966-05-10 Dresser Ind Safety brake
US3247930A (en) * 1964-03-31 1966-04-26 Dresser Ind Crane cab safety brake
US3685801A (en) * 1969-12-22 1972-08-22 Ahlgren Nils H Jack assemblies
FR2257044A1 (en) * 1974-01-09 1975-08-01 Mediterranee Const Navales Ind Safety stop for lift or escalator - has rack oscillating cranked sprung lever to rack locking position

Also Published As

Publication number Publication date
FR2478612B1 (en) 1982-06-18
FR2478612A1 (en) 1981-09-25

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