EP0300892A1 - Safety equipment for a scaffolding winch - Google Patents

Safety equipment for a scaffolding winch Download PDF

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Publication number
EP0300892A1
EP0300892A1 EP88401861A EP88401861A EP0300892A1 EP 0300892 A1 EP0300892 A1 EP 0300892A1 EP 88401861 A EP88401861 A EP 88401861A EP 88401861 A EP88401861 A EP 88401861A EP 0300892 A1 EP0300892 A1 EP 0300892A1
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EP
European Patent Office
Prior art keywords
switch
winches
winch
nacelle
lever
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Granted
Application number
EP88401861A
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German (de)
French (fr)
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EP0300892B1 (en
Inventor
Michel Cavalieri
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/54—Safety gear
    • B66D1/58—Safety gear responsive to excess of load
    • 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
    • B66D1/54—Safety gear
    • 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
    • B66D1/605—Rope, cable, or chain winding mechanisms; Capstans adapted for special purposes scaffolding winshes
    • 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
    • B66D1/7489—Capstans having a particular use, e.g. rope ascenders

Definitions

  • the present invention relates to a safety assembly for motorized flying scaffolding using two electric winches, each of which is powered by a control circuit, which scaffolding comprises a gondola suspended with two legs mounted, directly or indirectly pivoting, respectively on each of said winches.
  • the nacelle is joined to a pair of winches which are controlled, either individually, which requires the presence of two operators or the alternative commissioning of the two winches, or simultaneously by means of a box. central electric to which the two winches are connected.
  • These scaffolds are provided with safety systems in the event that the nacelle takes, relative to the horizontal, a moderate or excessive inclination.
  • the present invention provides means automatically correcting the inclination of the nacelle when the latter remains below a predetermined threshold or causing the engines to stop when the inclination becomes excessive.
  • each tab carries a lug adapted to penetrate a slot provided in a pull tab to move to the left or to the right said pull tab according to the lack of horizontality of the nacelle, the movement of said pull tab being capable of bring into contact with a switch interposed in said control circuit by causing it to open.
  • the pull tab has three projections through which it is likely to come into contact with a first, a second or a third switch interposed in the control circuit of the winch motor, causing it to open.
  • the opening of the first switch (excess tilt sive of the nacelle) causes the engines of the two winches to stop completely, while the opening of the second or third switch (moderate inclination of the nacelle) interrupts the operation of the engine of that of the winches on the highest side , uphill, or on the lowest side, downhill.
  • the second and third switches close again as soon as the cause that caused their opening ceases.
  • motorized flying scaffolding In addition to the safety systems acting in the event of moderate or excessive inclination of the nacelle, motorized flying scaffolding must necessarily be equipped with safety means to detect an overload of the nacelle, or on the contrary a load lower than normal. This latter situation can occur when the basket, downhill, touches the ground or hangs an obstacle, for example a balcony.
  • overload detection is obtained: - either by measuring the electric current, - Either by means implementing the compression of a spring (load cell).
  • the measurement of the electric intensity is not very precise because the intensity varies with the network voltage and, in the specific case of flying scaffolding, the winches are powered by long lengths of electric wires, source of voltage drop.
  • the weighing system it is certainly economical and easily adjustable, but it tends to give a pianotage effect.
  • the present invention provides a safety assembly which is simple and reliable in construction and which employs means common to both types of detection.
  • each suspension lug of the nacelle is articulated on a lever capable of acting on two electrical contacts away from which it is kept by elastic means suitably calibrated as long as the force F, at which is subject to said tab, is less than a first threshold S1 and greater than a second threshold S2, the passage of the force F to a value greater than S1 (overload) causing a first element of said lever to act on, and open, the first aforementioned switch, and the passage of the force F to a value less than S2 (underload) causing a second element of said lever to act on, and open, a fourth switch interposed in the supply circuit of each winch.
  • lever means both a simple lever and a set of articulated levers.
  • a pivot point capable of occupying two stable positions defined by two stops, the first position being imposed on it by the force F ′ transmitted to it the lever from the lug when this force is greater than the tare of the elastic underload means and the second position being imposed on it by said elastic means when said force F ′ is less than said tare.
  • opening the first switch causes the motors to stop completely. This is what happens in the event of an overload.
  • the opening of the fourth switch only causes the motors to stop in the lowering direction, since the system must be able to allow the nacelle to rise to release it, for example from the obstacle to which she clung.
  • the fourth switch closes as soon as the cause which caused its opening ceases.
  • the same first switch is used for two types of security: overload and excessive tilting of the platform.
  • the safety assembly according to the invention can be included in a box interposed between a conventional winch and the nacelle, or better be incorporated into the winch itself, and the invention naturally extends its scope to said winches.
  • a nacelle 1 suspended by two legs 2 to a pair of winches 3a-3b whose carrying cables are designated by the reference 4 and whose safety cables are designated by the reference 5.
  • the winches 3a and 3b are identical, but mounted inverted so that in FIG. 1, one of the faces of the winch is seen on side 3a and the opposite face on side 3b.
  • the winch 3a called “monitor winch”, is joined to the sector by the electric wire 6 and it feeds via wire 7 the winch 3b called “follower winch”.
  • the winch 3a is provided with a control cable 8a connected to an operating button box 8b.
  • the carrying cables 4 and the safety cables 5 are anchored to the upper lines and counterweights are fixed to the lower end of the cables.
  • the reference 9 designates the winch casing 3a or 3b.
  • the carrying cable 4 enters this casing 9 and is wound around an adhesion pulley 10, in a groove provided for this purpose, then leaves the casing 9.
  • the safety cable 5 also passes through the casing 9 but no did not represent it for the clarity of the drawings.
  • a roller 10a is mounted on a lever 11, a first end 11a of which is pivotally mounted in a hinge 12 and the other end of which 11b is subjected to the effect of a spring 13. Before the self-tightening effect presses the roller 10a on the cable 4, it is the spring 13 which forces the roller 10a to press the cable 4 into the groove of the adhesion pulley 10.
  • the nacelle 1 is suspended from the tab 2 by means of bolts penetrating into suitable holes 2a, 2b (FIG. 2).
  • the tab 2 is pivotally mounted at 14c and is joined to a set of articulated levers which will now be described in detail.
  • This set of levers comprises a first lever arm 14, one end of which 14a is held stationary by a spring 15 as long as the load applied to the tab 2 does not exceed a first predetermined threshold S1.
  • the other end 14b of the lever 14 is joined in 16d to a second lever 16, one end 16a of which is joined to the lever 11 by means of a connecting rod 25 and the other end of which 16b is held stationary by a spring 17 both that the load applied to the tab 2 remains greater than a second predetermined threshold S2.
  • the threshold S1 is set by a appropriate calibration of the spring 15 and the threshold S2 and adjusted by an appropriate calibration of the spring 17.
  • the points 14b and 16d could be confused in practice.
  • the point 16c of the lever 16 is capable of occupying two stable positions, in abutment at the bottom or at the top of the buttonhole 18 so that it offers, depending on the load applied to the tab 2, two pivoting positions for the lever 16 .
  • the set of levers further comprises a lever 20, one end 20a of which faces the end 14a of the lever 14 and the other end of which 20b faces the member of command to open a microswitch 21 interposed on the motor control circuit.
  • the lever 20 is pivotally mounted around a point 20c. Friction means, not shown, are provided to maintain the lever 20 in the pivoted open position of the microswitch 21 as long as it is not returned to the neutral position using the manual pusher 22.
  • a stop 37 limits movement under the effect of pusher 22.
  • pull tab 23 slidably mounted in a guide 24 consisting of two formations projecting from the housing 9.
  • the spring 17 and the buttonhole 18 are mounted on the guide 24.
  • the pull tab 23 has a slot or light 34 in which projects a lug 35 depending on the tab 2.
  • the pull tab 23 has three active projections 26, 27 and 28. These projections are capable of coming into contact with rollers 29, 30 and 31 acting respectively on the opening control device for switches 32, 33 and 21.
  • the tab 2 takes an inclination between the obliques 36a and 36b.
  • the displacement of the lug 35 is such that it does not push not on the ends of light 34, nothing happens.
  • the displacement of the lug 35 is greater, it displaces the zipper 23 to the right or to the left. If the zipper is moved to the right, the active point 26 of the zipper comes into contact with the roller 29 by opening the switch 32. If the zipper is moved to the left, the active point 27 of the zipper comes into contact with the roller 30 of the switch 33 which it causes to open.
  • the active point 28 of the pull tab 23 of one of the winches equipping the scaffolding will come into contact with the roller 31 which, thus being raised, will open the switch 21 by causing the engines of the two winches to stop completely.
  • the pull tab 23 is an "inert" member which remains in the position in which the lug 35 drives it, and that, given the stroke offered to the lug 35 by the light 34, the pull tab 23 does not follow the lug 35 only with a certain latency.
  • the safety assembly is included in a separate housing 38 which can be added to a conventional winch.
  • FIG. 3 the structure of the safety assembly is very similar to that of FIG. 2 and the same references designate the same parts. The only difference is that the levers 14 and 16 of FIG. 2 are merged into a single lever 39 in FIG. 3, that, consequently, the points 14b and 16d of FIG. 2 are merged into a single point 39a, and that this lever 39 is independent of the structure of the winch.
  • the pull tab could have a notch offering the same possibilities of lateral movement to the lug 35.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wind Motors (AREA)
  • Movable Scaffolding (AREA)

Abstract

L'ensemble de sécurité pour échafaudage volant est motorisé à l'aide de deux treuils électriques dont chacun est alimenté par un circuit de commande, et l'échafaudage comporte une nacelle (1) suspendue à deux pattes (2) montées pivotantes, directement ou indirectement, respectivement sur chacun desdits treuils (3a, 3b). Chaque patte (2) porte un ergot (35) adaptés à pénétrer dans une lumière (34) prévue dans une tirette (23) pour déplacer vers la gauche ou vers la droite ladite tirette selon le défaut d'horizontalité de la nacelle (1), le déplacement de ladite tirette (23) étant susceptible de l'amener en contact avec un interrupteur (21, 32 ou 33) interposé dans ledit circuit de commande en en provoquant l'ouverture.The safety assembly for a flying scaffold is motorized using two electric winches, each of which is powered by a control circuit, and the scaffolding comprises a nacelle (1) suspended on two legs (2) pivotally mounted, directly or indirectly, respectively on each of said winches (3a, 3b). Each tab (2) carries a lug (35) adapted to penetrate into a light (34) provided in a pull tab (23) to move to the left or to the right said pull tab according to the lack of horizontality of the nacelle (1) , the movement of said pull tab (23) being capable of bringing it into contact with a switch (21, 32 or 33) interposed in said control circuit by causing it to open.

Description

La présente invention a pour objet un ensemble de sécurité pour échafaudage volant motorisé à l'aide de deux treuils électriques dont chacun est alimenté par un circuit de commande, lequel échafaudage comporte une nacelle suspen­due à deux pattes montées, directement ou indirectement pivotantes, respectivement sur chacun desdits treuils.The present invention relates to a safety assembly for motorized flying scaffolding using two electric winches, each of which is powered by a control circuit, which scaffolding comprises a gondola suspended with two legs mounted, directly or indirectly pivoting, respectively on each of said winches.

Dans les échafaudages connus de ce type, la nacelle est réunie à une paire de treuils qui sont commandés, soit individuellement, ce qui nécessite la présence de deux opérateurs ou la mise en service alternative des deux treuils, soit simultanément au moyen d'un coffret électrique central auquel sont reliés les deux treuils.In known scaffolding of this type, the nacelle is joined to a pair of winches which are controlled, either individually, which requires the presence of two operators or the alternative commissioning of the two winches, or simultaneously by means of a box. central electric to which the two winches are connected.

Ces échafaudages sont munis de systèmes de sécurité pour le cas où la nacelle prendrait, par rapport à l'horizontale, une inclinaison modérée ou excessive.These scaffolds are provided with safety systems in the event that the nacelle takes, relative to the horizontal, a moderate or excessive inclination.

Ces moyens utilisent généralement un pendule attaquant un minirupteur ou des ampoules à mercure, système placé dans le coffret électrique central. Cependant l'inertie du pendule ou du mercure a tendance à donner un effet de pianotage malgré la présence éventuelle d'amortisseurs.These means generally use a pendulum attacking a microswitch or mercury bulbs, a system placed in the central electrical box. However, the inertia of the pendulum or of mercury tends to give a strumming effect despite the possible presence of shock absorbers.

La présente invention apporte des moyens corrigeant automatiquement l'inclinaison de la nacelle lorsque celle-ci reste au-dessous d'un seuil prédéterminé ou provoquant l'arrêt des moteurs lorsque l'inclinaison devient excessive.The present invention provides means automatically correcting the inclination of the nacelle when the latter remains below a predetermined threshold or causing the engines to stop when the inclination becomes excessive.

A cet effet, chaque patte porte un ergot adapté à pénétrer dans une fente prévue dans une tirette pour déplacer vers la gauche ou vers la droite ladite tirette selon le défaut d'horizontalité de la nacelle, le déplacement de ladite tirette étant susceptible de l'amener en contact avec un interrupteur interposé dans ledit circuit de commande en en provoquant l'ouverture.To this end, each tab carries a lug adapted to penetrate a slot provided in a pull tab to move to the left or to the right said pull tab according to the lack of horizontality of the nacelle, the movement of said pull tab being capable of bring into contact with a switch interposed in said control circuit by causing it to open.

Plus précisément, la tirette comporte trois projections par l'intermédiaire desquelles elle est susceptible de venir en contact avec un premier, un deuxième ou un troisième interrupteur interposés dans le circuit de commande du moteur du treuil, en en provoquant l'ouverture.More specifically, the pull tab has three projections through which it is likely to come into contact with a first, a second or a third switch interposed in the control circuit of the winch motor, causing it to open.

L'ouverture du premier interrupteur (inclinaison exces­ sive de la nacelle) entraîne l'arrêt total des moteurs des deux treuils, tandis que l'ouverture du deuxième ou du troisième interrupteur (inclinaison modérée de la nacelle) interrompt le fonctionnement du moteur de celui des treuils se trouvant du côté le plus haut, en montée, ou du côté le plus bas, en descente.The opening of the first switch (excess tilt sive of the nacelle) causes the engines of the two winches to stop completely, while the opening of the second or third switch (moderate inclination of the nacelle) interrupts the operation of the engine of that of the winches on the highest side , uphill, or on the lowest side, downhill.

Les deuxième et troisième interrupteurs se referment dès que cesse la cause qui a provoqué leur ouverture. Par contre, il est prévu, d'une part, des moyens adaptés à empêcher que le premier interrupteur se referme de lui-même, même si la cause qui a provoqué son ouverture a cessé et, d'autre part, des moyens de fermeture manuels dudit premier interrupteur.The second and third switches close again as soon as the cause that caused their opening ceases. On the other hand, there are provided, on the one hand, means adapted to prevent the first switch from closing by itself, even if the cause which caused its opening has ceased, and, on the other hand, closing means manuals of said first switch.

Outre les systèmes de sécurité agissant en cas d'incli­naison modérée ou excessive de la nacelle, les échafaudages volants motorisés doivent nécessairement être équipés de moyens de sécurité pour détecter une surcharge de la nacelle, ou au contraire une charge inférieure à la normale. Cette dernière situation peut se produire lorsque la nacelle, en descente, touche le sol ou accroche un obstacle, par exemple un balcon.In addition to the safety systems acting in the event of moderate or excessive inclination of the nacelle, motorized flying scaffolding must necessarily be equipped with safety means to detect an overload of the nacelle, or on the contrary a load lower than normal. This latter situation can occur when the basket, downhill, touches the ground or hangs an obstacle, for example a balcony.

Dans les échafaudages volants connus, la détection de surcharge est obtenue :
- soit par une mesure de l'intensité électrique,
- soit par des moyens mettant en oeuvre la compression d'un ressort (peson).In known flying scaffolds, overload detection is obtained:
- either by measuring the electric current,
- Either by means implementing the compression of a spring (load cell).

La mesure de l'intensité électrique est peu précise car l'intensité varie avec la tension du réseau et, dans le cas spécifique des échafaudages volants, les treuils sont alimentés par de grandes longueurs de fils électriques, source de chute de tension. En ce qui concerne le système à peson, il est certes économique et facilement réglable, mais il a tendance à donner un effet de pianotage.The measurement of the electric intensity is not very precise because the intensity varies with the network voltage and, in the specific case of flying scaffolding, the winches are powered by long lengths of electric wires, source of voltage drop. Regarding the weighing system, it is certainly economical and easily adjustable, but it tends to give a pianotage effect.

Pour ce qui est de la détection d'une charge inférieure à la normale, on utilise à l'heure actuelle :
- soit la mesure de la raideur du câble porteur puisque, lorsque la nacelle repose sur un obstacle, le câble devient mou,
- soit la manoeuvre d'un interrupteur par un point d'appui sur l'ancrage de la nacelle ou le carter du treuil, lequel point d'appui est soumis, d'une part, à la charge et, d'autre part, à l'action opposée d'un ressort.For the detection of a load lower than normal, we currently use:
either the measurement of the stiffness of the carrying cable since, when the nacelle rests on an obstacle, the cable becomes soft,
- either the operation of a switch by a fulcrum on the anchoring of the nacelle or the winch casing, which fulcrum is subjected, on the one hand, to the load and, on the other hand, to the opposite action of a spring.

La mesure de la raideur du câble est relativement inefficace contre l'accrochage en descente car elle ne réagit que si la charge est totalement supprimée. Le déplacement d'un point d'appui à l'encontre d'un ressort est, par contre, une solution intéressante qui est exploitée selon la présente invention.Measuring the stiffness of the cable is relatively ineffective against hanging downhill because it only reacts if the load is completely removed. Moving a fulcrum against a spring is, on the other hand, an interesting solution which is exploited according to the present invention.

Comme il ressort de l'analyse qui précède, dans l'art antérieur, on utilise des moyens séparés pour détecter la surcharge et la sous-charge.As emerges from the preceding analysis, in the prior art, separate means are used to detect the overload and the underload.

La présente invention apporte, au contraire, un ensemble de sécurité de construction simple et fiable et qui met en oeuvre des moyens communs aux deux types de détection.The present invention, on the contrary, provides a safety assembly which is simple and reliable in construction and which employs means common to both types of detection.

A cet effet, selon l'invention, chaque patte de suspension de la nacelle est articulée sur un levier susceptible d'agir sur deux contacts électriques à l'écart desquels il est maintenu par des moyens élastiques convena­blement tarés tant que la force F, à laquelle est soumise ladite patte, est inférieure à un premier seuil S1 et supérieure à un second seuil S2, le passage de la force F à une valeur supérieure à S1 (surcharge) amenant un premier élément dudit levier à agir sur, et ouvrir, le premier interrupteur précité, et le passage de la force F à une valeur inférieure à S2 (sous-charge) amenant un second élément dudit levier à agir sur, et ouvrir, un quatrième interrupteur interposé dans le circuit d'alimentation de chaque treuil.To this end, according to the invention, each suspension lug of the nacelle is articulated on a lever capable of acting on two electrical contacts away from which it is kept by elastic means suitably calibrated as long as the force F, at which is subject to said tab, is less than a first threshold S1 and greater than a second threshold S2, the passage of the force F to a value greater than S1 (overload) causing a first element of said lever to act on, and open, the first aforementioned switch, and the passage of the force F to a value less than S2 (underload) causing a second element of said lever to act on, and open, a fourth switch interposed in the supply circuit of each winch.

Il est entendu que, dans la présente description et dans les revendications, on entend par "levier" aussi bien un simple levier qu'un ensemble de leviers articulés.It is understood that, in the present description and in the claims, the term "lever" means both a simple lever and a set of articulated levers.

Selon une forme d'exécution préférée de l'invention, il est prévu un point de pivotement susceptible d'occuper deux positions stables définies par deux butées, la première position lui étant imposée par la force F′ que lui transmet le levier depuis la patte lorsque cette force est supérieure à la tare des moyens élastiques de sous-charge et la seconde position lui étant imposée par lesdits moyens élastiques lorsque ladite force F′ est inférieure à ladite tare.According to a preferred embodiment of the invention, there is provided a pivot point capable of occupying two stable positions defined by two stops, the first position being imposed on it by the force F ′ transmitted to it the lever from the lug when this force is greater than the tare of the elastic underload means and the second position being imposed on it by said elastic means when said force F ′ is less than said tare.

Comme on l'a vu plus haut, l'ouverture du premier interrupteur entraîne l'arrêt total des moteurs. C'est ce qui se produit en cas de surcharge. Par contre, en cas de sous-charge, l'ouverture du quatrième interrupteur n'entraîne que l'arrêt des moteurs dans le sens descente, puisque le système doit pouvoir permettre la remontée de la nacelle pour la dégager par exemple de l'obstacle auquel elle s'est accrochée.As seen above, opening the first switch causes the motors to stop completely. This is what happens in the event of an overload. On the other hand, in the event of an underload, the opening of the fourth switch only causes the motors to stop in the lowering direction, since the system must be able to allow the nacelle to rise to release it, for example from the obstacle to which she clung.

Dans une forme d'exécution préférée de l'invention, le quatrième interrupteur se referme dès que cesse la cause qui a provoqué son ouverture.In a preferred embodiment of the invention, the fourth switch closes as soon as the cause which caused its opening ceases.

Comme on le voit, le même premier interrupteur est utilisé pour deux types de sécurité : surcharge et inclinai­son excessive de la nacelle.As we can see, the same first switch is used for two types of security: overload and excessive tilting of the platform.

L'ensemble de sécurité selon l'invention peut être inclus dans un coffret interposé entre un treuil classique et la nacelle, ou mieux être incorporé au treuil lui-même, et l'invention étend naturellement sa portée auxdits treuils.The safety assembly according to the invention can be included in a box interposed between a conventional winch and the nacelle, or better be incorporated into the winch itself, and the invention naturally extends its scope to said winches.

D'autres caractéristiques et avantages de l'invention ressortiront de la description ci-après faite en référence aux dessins annexés dans lesquels :

  • - la figure 1 est une représentation schématique d'un échafaudage volant muni de deux treuils selon l'invention,
  • - la figure 2 est une représentation schématique des moyens de sécurité incorporés aux treuils de la figure 1 qui, dans ce cas particulier, sont des treuils auto-serrants, et
  • - la figure 3 est une représentation schématique d'un ensemble de sécurité isolé, adaptable à un treuil classique.
Other characteristics and advantages of the invention will emerge from the description below made with reference to the appended drawings in which:
  • FIG. 1 is a schematic representation of a flying scaffolding provided with two winches according to the invention,
  • FIG. 2 is a schematic representation of the safety means incorporated in the winches of FIG. 1 which, in this particular case, are self-tightening winches, and
  • - Figure 3 is a schematic representation of an isolated safety assembly, adaptable to a conventional winch.

Si l'on se reporte à la figure 1, on voit une nacelle 1 suspendue par deux pattes 2 à un couple de treuils 3a-3b dont les câbles porteurs sont désignés par la référence 4 et dont les câbles de sécurité sont désignés par la référence 5. Au branchement électrique près, les treuils 3a et 3b sont identiques, mais montés inversés de sorte qu'à la figure 1, on voit l'une des faces du treuil côté 3a et la face opposée côté 3b. Le treuil 3a, dit "treuil moniteur", est réuni au secteur par le fil électrique 6 et il alimente via le fil 7 le treuil 3b dit "treuil suiveur". Le treuil 3a est muni d'un câble de commande 8a relié à une boîte à boutons de manoeuvre 8b.If we refer to Figure 1, we see a nacelle 1 suspended by two legs 2 to a pair of winches 3a-3b whose carrying cables are designated by the reference 4 and whose safety cables are designated by the reference 5. Close to the electrical connection, the winches 3a and 3b are identical, but mounted inverted so that in FIG. 1, one of the faces of the winch is seen on side 3a and the opposite face on side 3b. The winch 3a, called "monitor winch", is joined to the sector by the electric wire 6 and it feeds via wire 7 the winch 3b called "follower winch". The winch 3a is provided with a control cable 8a connected to an operating button box 8b.

Les câbles porteurs 4 et la câbles de sécurité 5 sont ancrés aux suspentes supérieures et des contrepoids sont fixés à l'extrémité inférieure des câbles.The carrying cables 4 and the safety cables 5 are anchored to the upper lines and counterweights are fixed to the lower end of the cables.

Si l'on se réfère à la figure 2, la référence 9 désigne le carter du treuil 3a ou 3b. Le câble porteur 4 pénètre dans ce carter 9 et s'enroule autour d'une poulie d'adhérence 10, dans une gorge prévue à cet effet, puis ressort du carter 9. Le câble de sécurité 5 traverse également le carter 9 mais on ne l'a pas représenté pour la clarté des dessins. Un galet 10a est monté sur un levier 11 dont une première extrémité 11a est montée pivotante dans une articulation 12 et dont l'autre extrémité 11b est soumise à l'effet d'un ressort 13. Avant que l'effet d'auto-serrage appuie le galet 10a sur le câble 4, c'est le ressort 13 qui contraint le galet 10a à presser le câble 4 dans la gorge de la poulie d'adhérence 10.If reference is made to FIG. 2, the reference 9 designates the winch casing 3a or 3b. The carrying cable 4 enters this casing 9 and is wound around an adhesion pulley 10, in a groove provided for this purpose, then leaves the casing 9. The safety cable 5 also passes through the casing 9 but no did not represent it for the clarity of the drawings. A roller 10a is mounted on a lever 11, a first end 11a of which is pivotally mounted in a hinge 12 and the other end of which 11b is subjected to the effect of a spring 13. Before the self-tightening effect presses the roller 10a on the cable 4, it is the spring 13 which forces the roller 10a to press the cable 4 into the groove of the adhesion pulley 10.

Comme il ressort de la figure 1, la nacelle 1 est suspendue à la patte 2 au moyen de boulons pénétrant dans des perçages 2a, 2b appropriés (figure 2). La patte 2 est montée pivotante en 14c et elle est réunie à un ensemble de leviers articulés que l'on va maintenant décrire en détail.As can be seen from FIG. 1, the nacelle 1 is suspended from the tab 2 by means of bolts penetrating into suitable holes 2a, 2b (FIG. 2). The tab 2 is pivotally mounted at 14c and is joined to a set of articulated levers which will now be described in detail.

Cet ensemble de leviers comporte un premier bras de levier 14 dont une extrémité 14a est maintenue stationnaire par un ressort 15 tant que la charge appliquée sur la patte 2 n'excède pas un premier seuil prédéterminé S1. L'autre extrémité 14b du levier 14 est réunie en 16d à un second levier 16 dont une extrémité 16a est réunie au levier 11 par l'intermédiaire d'une bielle 25 et dont l'autre extrémité 16b est maintenue stationnaire par un ressort 17 tant que la charge appliquée sur la patte 2 demeure supérieure à un second seuil prédéterminé S2. La seuil S1 est réglé par un tarage approprié du ressort 15 et le seuil S2 et réglé par un tarage approprié du ressort 17. Les points 14b et 16d pourraient être confondus en pratique.This set of levers comprises a first lever arm 14, one end of which 14a is held stationary by a spring 15 as long as the load applied to the tab 2 does not exceed a first predetermined threshold S1. The other end 14b of the lever 14 is joined in 16d to a second lever 16, one end 16a of which is joined to the lever 11 by means of a connecting rod 25 and the other end of which 16b is held stationary by a spring 17 both that the load applied to the tab 2 remains greater than a second predetermined threshold S2. The threshold S1 is set by a appropriate calibration of the spring 15 and the threshold S2 and adjusted by an appropriate calibration of the spring 17. The points 14b and 16d could be confused in practice.

Le point 16c du levier 16 est susceptible d'occuper deux positions stables, en butée en bas ou en haut de la boutonnière 18 de sorte qu'il offre, selon la charge appliquée à la patte 2, deux positions de pivotement pour le levier 16.The point 16c of the lever 16 is capable of occupying two stable positions, in abutment at the bottom or at the top of the buttonhole 18 so that it offers, depending on the load applied to the tab 2, two pivoting positions for the lever 16 .

En vis-à-vis du ressort 17 et de l'extrémité 16b du levier 16 se trouve l'organe de commande d'ouverture d'un micro-interrupteur 19 interposé sur le circuit de commande électrique du moteur, non représenté, du treuil.Opposite the spring 17 and the end 16b of the lever 16 is the opening control member of a microswitch 19 interposed on the electrical control circuit of the winch motor, not shown. .

L'ensemble de leviers comporte en outre un levier 20, dont une extrémité 20a est en vis-à-vis de l'extrémité 14a du levier 14 et dont l'autre extrémité 20b est en vis-à-vis de l'organe de commande d'ouverture d'un micro-interrupteur 21 interposé sur le circuit de commande du moteur. Le levier 20 est monté pivotant autour d'un point 20c. Il est prévu des moyens de friction non représentés pour maintenir le levier 20 dans la position pivotée d'ouverture du micro-interrupteur 21 tant qu'il n'est pas ramené en position neutre à l'aide du poussoir manuel 22. Une butée 37 limite le déplacement sous l'effet du poussoir 22.The set of levers further comprises a lever 20, one end 20a of which faces the end 14a of the lever 14 and the other end of which 20b faces the member of command to open a microswitch 21 interposed on the motor control circuit. The lever 20 is pivotally mounted around a point 20c. Friction means, not shown, are provided to maintain the lever 20 in the pivoted open position of the microswitch 21 as long as it is not returned to the neutral position using the manual pusher 22. A stop 37 limits movement under the effect of pusher 22.

Il est en outre prévu une tirette 23 montée coulissante dans un guide 24 constitué de deux formations se projetant depuis le carter 9. Le ressort 17 et la boutonnière 18 sont montés sur le guide 24. La tirette 23 présente une fente ou lumière 34 dans laquelle se projette un ergot 35 dépendant de la patte 2. Comme on le voit, la tirette 23 comporte trois projections actives 26, 27 et 28. Ces projections sont susceptibles de venir en contact avec des galets 29, 30 et 31 agissant respectivement sur l'organe de commande d'ouverture des interrupteurs 32, 33 et 21.There is also a pull tab 23 slidably mounted in a guide 24 consisting of two formations projecting from the housing 9. The spring 17 and the buttonhole 18 are mounted on the guide 24. The pull tab 23 has a slot or light 34 in which projects a lug 35 depending on the tab 2. As can be seen, the pull tab 23 has three active projections 26, 27 and 28. These projections are capable of coming into contact with rollers 29, 30 and 31 acting respectively on the opening control device for switches 32, 33 and 21.

Le fonctionnement du dispositif est le suivant :The operation of the device is as follows:

En l'absence de charge, lorsque la nacelle 1 est au sol, le ressort 13 appuie le galet 10a sur le câble 4 pour assurer son entraînement. Des moyens, non représentés, sont prévus pour neutraliser manuellement, à ce stade, les organes détecteurs de sous-charge (17, 16b, 19).In the absence of a load, when the nacelle 1 is on the ground, the spring 13 presses the roller 10a on the cable 4 to ensure its drive. Means, not shown, are provided to manually neutralize, at this stage, the underload detection members (17, 16b, 19).

Lorsque la nacelle s'élève et que la charge est normale, c'est-à-dire comprise entre les seuils S1 et S2, la patte 2 transmet cette charge au levier 14, via les points 14c, 14b, 16d. Les points 14a et 16b étant respectivement maintenus stationnaires par les ressorts 15 et 17, le point pivot 16c est en butée en partie basse dans la boutonnière 18. Une force proportionnelle à la charge est ainsi transmise via le levier 16 au levier 11, et par suite au galet presseur 10a. On comprend que plus la charge appliquée à la patte 2 est grande, plus grande est la pression exercée par le galet 10a sur le câble 4.When the nacelle rises and the load is normal, that is to say between the thresholds S1 and S2, the tab 2 transmits this load to the lever 14, via the points 14c, 14b, 16d. The points 14a and 16b being respectively kept stationary by the springs 15 and 17, the pivot point 16c is in abutment at the bottom in the buttonhole 18. A force proportional to the load is thus transmitted via the lever 16 to the lever 11, and by following the pressure roller 10a. It will be understood that the greater the load applied to the tab 2, the greater the pressure exerted by the roller 10a on the cable 4.

En cas de surcharge, la traction exercée sur la patte 2 soumet le ressort 15, par l'intermédiaire du levier 14, à une force supérieure à celle dudit ressort et le levier 14 pivote en amenant le point 14a au contact de l'extrémité 20a du levier 20. Il s'ensuit que le levier 20 pivote autour du point 20c et agit sur l'interrupteur 21. L'ouverture de l'interrupteur 21 interposé dans le circuit de commande du moteur du treuil, entraîne l'arrêt dudit moteur. Comme on l'a vu plus haut, même si la surcharge qui a causé cet arrêt est supprimée, l'interrupteur 21 ne se referme pas de lui-même. Il est nécessaire d'agir manuellement sur le poussoir 22 pour ramener le levier 20 en position neutre.In the event of an overload, the traction exerted on the tab 2 subjects the spring 15, by means of the lever 14, to a force greater than that of the said spring and the lever 14 pivots bringing the point 14a into contact with the end 20a of the lever 20. It follows that the lever 20 pivots around the point 20c and acts on the switch 21. The opening of the switch 21 interposed in the winch motor control circuit, causes said motor to stop . As seen above, even if the overload which caused this stop is removed, the switch 21 does not close by itself. It is necessary to act manually on the pusher 22 to return the lever 20 to the neutral position.

En cas de charge inférieure au seuil S2, la force transmise à l'extrémité 16b du levier 16 devient inférieure à celle du ressort 17 et celui-ci pousse alors le levier 16 qui pivote autour du point 16a pour actionner l'interrupteur 19. Le point 16c se trouve maintenant en butée haute dans la boutonnière 18. L'ouverture de l'interrupteur 19, interposé sur le circuit de commande du moteur du treuil, interdit le fonctionnement du treuil en descente, mais autorise ce fonctionnement en montée.In the event of a load below the threshold S2, the force transmitted to the end 16b of the lever 16 becomes less than that of the spring 17 and the latter then pushes the lever 16 which pivots around the point 16a to actuate the switch 19. The point 16c is now in the upper stop in the buttonhole 18. The opening of the switch 19, interposed on the control circuit of the winch motor, prohibits the operation of the winch downhill, but allows this operation uphill.

En cas d'inclinaison modérée de la nacelle, la patte 2 prend une inclinaison comprise entre les obliques 36a et 36b. Tant que le déplacement de l'ergot 35 est tel qu'il ne pousse pas sur les extrémités de la lumière 34, il ne se passe rien. Si, par contre, le déplacement de l'ergot 35 est plus important, il déplace la tirette 23 vers la droite ou vers la gauche. Si la tirette est déplacée vers la droite, le point actif 26 de la tirette vient en contact avec le galet 29 en ouvrant l'interrupteur 32. Si la tirette est déplacée vers la gauche, le point actif 27 de la tirette vient en contact avec le galet 30 de l'interrupteur 33 dont il provoque l'ouvertu­re. Selon l'inclinaison prise par la nacelle, on obtiendra ainsi un arrêt du moteur de celui des treuils qui se trouve le plus haut en cas de montée, ou le plus bas en cas de descente, et par suite un réajustement automatique de l'horizontalité de la nacelle.In case of moderate inclination of the nacelle, the tab 2 takes an inclination between the obliques 36a and 36b. As long as the displacement of the lug 35 is such that it does not push not on the ends of light 34, nothing happens. If, on the other hand, the displacement of the lug 35 is greater, it displaces the zipper 23 to the right or to the left. If the zipper is moved to the right, the active point 26 of the zipper comes into contact with the roller 29 by opening the switch 32. If the zipper is moved to the left, the active point 27 of the zipper comes into contact with the roller 30 of the switch 33 which it causes to open. Depending on the inclination taken by the nacelle, one will thus obtain a stop of the engine of that of the winches which is the highest in case of ascent, or the lowest in case of descent, and consequently an automatic readjustment of the horizontality of the gondola.

Si l'inclinaison de la nacelle excède un seuil prédé­terminé, le point actif 28 de la tirette 23 de l'un des treuils équipant l'échafaudage, viendra en contact avec le galet 31 qui, se trouvant ainsi soulevé, ouvrira l'inter­rupteur 21 en provoquant l'arrêt total des moteurs des deux treuils.If the inclination of the nacelle exceeds a predetermined threshold, the active point 28 of the pull tab 23 of one of the winches equipping the scaffolding, will come into contact with the roller 31 which, thus being raised, will open the switch 21 by causing the engines of the two winches to stop completely.

On comprend que la tirette 23 est un organe "inerte" qui reste dans la position où l'entraîne l'ergot 35, et que, vu la course offerte à l'ergot 35 par la lumière 34, la tirette 23 ne suit l'ergot 35 qu'avec une certaine latence.It is understood that the pull tab 23 is an "inert" member which remains in the position in which the lug 35 drives it, and that, given the stroke offered to the lug 35 by the light 34, the pull tab 23 does not follow the lug 35 only with a certain latency.

Dans la forme d'exécution de la figure 3, l'ensemble de sécurité est inclus dans un boîtier distinct 38 que l'on peut adjoindre à un treuil classique. On pourra soit fixer le boîtier au carter du treuil et suspendre la nacelle à la patte 2 du boîtier 38 (cas de la figure 3), soit fixer le boîtier à la nacelle 1 et suspendre ledit boîter par une patte articulée au carter du treuil.In the embodiment of Figure 3, the safety assembly is included in a separate housing 38 which can be added to a conventional winch. We can either attach the housing to the winch housing and suspend the nacelle to the lug 2 of the housing 38 (case of Figure 3), or fix the housing to the nacelle 1 and suspend said housing by a hinged lug to the housing of the winch.

A la figure 3, la structure de l'ensemble de sécurité est très similaire à celle de la figure 2 et les mêmes références désignent les mêmes pièces. La seule différence est que les leviers 14 et 16 de la figure 2 sont confondus en un levier unique 39 à la figure 3, que, par suite, les points 14b et 16d de la figure 2 sont confondus en un point unique 39a, et que ce levier 39 est indépendant de la structure du treuil.In FIG. 3, the structure of the safety assembly is very similar to that of FIG. 2 and the same references designate the same parts. The only difference is that the levers 14 and 16 of FIG. 2 are merged into a single lever 39 in FIG. 3, that, consequently, the points 14b and 16d of FIG. 2 are merged into a single point 39a, and that this lever 39 is independent of the structure of the winch.

Ces différences n'entraînent aucune modification du fonctionnement du système de sécurité qu'il est donc inutile de décrire à nouveau.These differences do not entail any modification of the functioning of the security system which it is therefore unnecessary to describe again.

Il est bien entendu que l'invention n'est pas limitée aux formes d'exécution décrites et représentées.It is understood that the invention is not limited to the embodiments described and shown.

En particulier, au lieu d'une lumière 34, la tirette pourrait présenter une encoche offrant les mêmes possibilités de mouvement latéral à l'ergot 35.In particular, instead of a light 34, the pull tab could have a notch offering the same possibilities of lateral movement to the lug 35.

On pourrait également combiner les mâchoires agissant de manière classique sur le câble de sécurité 5 des treuils de la figure 1 et les moyens selon l'invention en soumettant ces mâchoires à une commande par un circuit électrique incorpo­rant un électro-aimant et un ou plusieurs des micro-inter­rupteurs des moyens de sécurité selon l'invention.One could also combine the jaws acting in a conventional manner on the safety cable 5 of the winches of FIG. 1 and the means according to the invention by subjecting these jaws to control by an electrical circuit incorporating an electromagnet and one or more of the microswitches of the safety means according to the invention.

Claims (8)

1- Ensemble de sécurité pour échafaudage volant motorisé à l'aide de deux treuils électriques dont chacun est alimenté par un circuit de commande, lequel échafaudage comporte une nacelle (1) suspendue à deux pattes (2) montées pivotantes, directement ou indirectement, respectivement sur chacun desdits treuils (3a, 3b), caractérisé en ce que chaque patte (2) porte un ergot (35) adapté à pénétrer dans une lumière (34) prévue dans une tirette (23) pour déplacer vers la gauche ou vers la droite ladite tirette selon le défaut d'horizontalité de la nacelle (1), le déplacement de ladite tirette (23) étant susceptible de l'amener en contact avec un interrupteur (21, 32 ou 33) interposé dans ledit circuit de commande en en provoquant l'ouverture.1- Safety assembly for motorized flying scaffolding using two electric winches, each of which is powered by a control circuit, which scaffolding comprises a nacelle (1) suspended on two legs (2) pivotally mounted, directly or indirectly, respectively on each of said winches (3a, 3b), characterized in that each tab (2) carries a lug (35) adapted to penetrate into a light (34) provided in a pull tab (23) for moving to the left or to the right said pull tab according to the lack of horizontality of the nacelle (1), the displacement of said pull pull (23) being capable of bringing it into contact with a switch (21, 32 or 33) interposed in said control circuit by causing it the opening. 2- Ensemble selon la revendication 1, caractérisé en ce que la tirette (23) comporte trois projections (28, 26, 27) par l'intermédiaire desquelles elle est susceptible de venir en contact avec un premier interrupteur (21) (inclinaison excessive de la nacelle) ou un deuxième ou troisième interrupteur (32 ou 33) (inclinaison modérée de la nacelle) interposés dans le circuit de commande du moteur du treuil en en provoquant l'ouverture.2- An assembly according to claim 1, characterized in that the pull tab (23) comprises three projections (28, 26, 27) by means of which it is capable of coming into contact with a first switch (21) (excessive inclination of the nacelle) or a second or third switch (32 or 33) (moderate inclination of the nacelle) interposed in the winch motor control circuit by causing it to open. 3- Ensemble selon la revendication 2, caractérisé en ce que l'ouverture du premier interrupteur (21) interrompt l'alimentation des moteurs des deux treuils (3a, 3b).3- An assembly according to claim 2, characterized in that the opening of the first switch (21) interrupts the supply of the motors of the two winches (3a, 3b). 4- Ensemble selon la revendication 2 ou 3, caractérisé en ce que l'ouverture du deuxième ou troisième interrupteur (32 ou 33) interrompt le fonctionnement du moteur de celui des treuils (3a, 3b) se trouvant du côté le plus haut en montée ou du côté le plus bas en descente.4- The assembly of claim 2 or 3, characterized in that the opening of the second or third switch (32 or 33) interrupts the operation of the engine that of the winches (3a, 3b) located on the highest side uphill or on the lowest side downhill. 5- Ensemble selon l'une quelconque des revendications 2 à 4, caractérisé en ce qu'il comporte, d'une part, des moyens adaptés à empêcher que le premier interrupteur (21) se referme de lui-même, même si la cause qui a provoqué son ouverture a cessé, et d'autre part des moyens de fermeture manuels (22) dudit interrupteur.5- An assembly according to any one of claims 2 to 4, characterized in that it comprises, on the one hand, means adapted to prevent the first switch (21) from closing by itself, even if the cause which caused its opening has ceased, and on the other hand manual closing means (22) of said switch. 6- Ensemble selon l'une quelconque des revendications 1 à 5, caractérisé en ce que chacune desdites pattes (2) est articulée sur un levier susceptible d'agir sur deux contacts électriques (19, 21) à l'écart desquels il est maintenu par des moyens élastiques convenablement tarés (15, 17) tant que la force (F) à laquelle est soumise la patte (2) est inférieure à un premier seuil (S1) et supérieure à un second seuil (S2), le passage de la force F à une valeur supérieure à S1 (surcharge) amenant un premier élément (14a, 20) dudit levier à agir sur, et ouvrir, ledit premier interrupteur (21) et le passage de la force (F) à une valeur inférieure à S2 (sous-charge) amenant un second élément (16b) dudit levier à agir sur, et ouvrir, un quatrième interrupteur (19) interposé dans ledit circuit de commande du moteur du treuil.6- An assembly according to any one of claims 1 to 5, characterized in that each of said legs (2) is articulated on a lever capable of acting on two electrical contacts (19, 21) away from which it is kept by suitably tared elastic means (15, 17) as long as the force (F) to which the tab (2) is subjected is less than a first threshold (S1) and greater than a second threshold (S2), the passage of the force F to a value greater than S1 (overload) causing a first element (14a, 20) of said lever to act on, and open, said first switch (21) and the passage of force (F) to a value less than S2 (underload) causing a second element (16b) of said lever to act on, and open, a fourth switch (19) interposed in said control circuit of the winch motor. 7- Ensemble selon la revendication 6, caractérisé en ce qu'il comprend un point (16c) de pivotement susceptible d'occuper deux positions stables définies par deux butées (18), la première position lui étant imposée par la force (F′) que lui transmet le levier depuis la patte (2) lorsque cette force est supérieure à la tare des moyens élastiques de sous-charge (17) et la seconde position lui étant imposée par lesdits moyens élastiques (17) lorsque ladite force (F′) est inférieure à ladite tare.7- An assembly according to claim 6, characterized in that it comprises a pivot point (16c) capable of occupying two stable positions defined by two stops (18), the first position being imposed on it by force (F ′) that the lever transmits to it from the lug (2) when this force is greater than the tare weight of the elastic underload means (17) and the second position being imposed on it by said elastic means (17) when said force (F ′) is less than said tare. 8- Système de deux treuils pour échafaudage volant utilisant des treuils qui incorporent l'ensemble de sécurité selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'un des treuils (3a), dit "treuil moniteur", est pourvu d'une alimentation électrique (6) reliée au secteur et en ce que l'autre treuil (3b), dit "treuil suiveur", est alimenté (selon 7) via le treuil moniteur (3a).8- System of two winches for flying scaffolding using winches which incorporate the safety assembly according to any one of claims 1 to 7, characterized in that one of the winches (3a), called "monitor winch", is provided with an electrical supply (6) connected to the sector and in that the other winch (3b), called "follower winch", is supplied (according to 7) via the monitor winch (3a).
EP88401861A 1987-07-21 1988-07-19 Safety equipment for a scaffolding winch Expired - Lifetime EP0300892B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8710276 1987-07-21
FR8710276A FR2618421B1 (en) 1987-07-21 1987-07-21 SAFETY ASSEMBLY FOR FLYING SCAFFOLD WINCH

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EP0300892A1 true EP0300892A1 (en) 1989-01-25
EP0300892B1 EP0300892B1 (en) 1991-05-02

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EP (1) EP0300892B1 (en)
DE (1) DE3862620D1 (en)
FR (1) FR2618421B1 (en)

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FR2427997A1 (en) * 1978-06-09 1980-01-04 Tractel Sa AUTOMATIC INTERVENTION DEVICE FOR STOPPING THE TILT MOVEMENT OF A NACELLE SUSPENDED FROM TWO OR MORE WINCHES
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US1710442A (en) * 1927-04-27 1929-04-23 Shepard Co Lewis Four-post hoisting machine
SU626187A1 (en) * 1977-04-25 1978-09-30 Всесоюзный Строительный Трест По Механизации Работ "Энергомеханизация" Scaffold

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US3586125A (en) * 1969-04-23 1971-06-22 Pomagalski Jean Sa Scaffolding winch with motor
DE2634116A1 (en) * 1975-07-30 1977-02-17 Europ Levage Manutention AUTOMATIC LIFTING DEVICE FOR MOTOR OPERATED HOISTING EQUIPMENT
BE838434A (en) * 1976-02-11 1976-05-28 SAFETY DEVICE FOR SUSPENSION BRIDGES AND THE LIKE
DE2732516A1 (en) * 1977-07-19 1979-02-01 Mannesmann Ag Emergency brake for building facade suspended work platform - has brake actuating linkage sensitive to inclination of platform
FR2427997A1 (en) * 1978-06-09 1980-01-04 Tractel Sa AUTOMATIC INTERVENTION DEVICE FOR STOPPING THE TILT MOVEMENT OF A NACELLE SUSPENDED FROM TWO OR MORE WINCHES
GB2110632A (en) * 1979-06-01 1983-06-22 Tractel Sa Cable traction or hoisting apparatus
US4462484A (en) * 1981-09-03 1984-07-31 Platforms And Power, Inc. Tension sensing device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0401099A1 (en) * 1989-05-29 1990-12-05 Tractel S.A. Apparatus for driving a load carrying strap with a coordinated device for deflection of the load and guiding of the strap
FR2746783A1 (en) * 1996-03-27 1997-10-03 Fontanel Robert Balanced support for lifting loads
EP1008550A1 (en) * 1998-12-10 2000-06-14 BMG Baugeräte und Maschinen GmbH Mechanical arrangement for limiting the movement of working platforms
FR2921165A1 (en) * 2007-09-19 2009-03-20 Fixator Soc Par Actions Simpli PLATFORM ORIENTATION MAINTENANCE SUPPORT DEVICE AND RELATED ELEVATION DEVICE
EP2040138A1 (en) 2007-09-19 2009-03-25 Fixator Device to help maintain the orientation of a platform and associated raising device
WO2013004663A1 (en) * 2011-07-04 2013-01-10 Tractel Greifzug Gmbh Endless cable winch
US9422140B2 (en) 2011-07-04 2016-08-23 Tractel Greifzug Gmbh Endless cable winch with overload protection

Also Published As

Publication number Publication date
US4821842A (en) 1989-04-18
FR2618421A1 (en) 1989-01-27
FR2618421B1 (en) 1990-01-05
DE3862620D1 (en) 1991-06-06
EP0300892B1 (en) 1991-05-02

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