EP0019574B1 - Lifting device, especially pulley block - Google Patents

Lifting device, especially pulley block Download PDF

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Publication number
EP0019574B1
EP0019574B1 EP19800440001 EP80440001A EP0019574B1 EP 0019574 B1 EP0019574 B1 EP 0019574B1 EP 19800440001 EP19800440001 EP 19800440001 EP 80440001 A EP80440001 A EP 80440001A EP 0019574 B1 EP0019574 B1 EP 0019574B1
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EP
European Patent Office
Prior art keywords
lifting device
sheave
rope
axis
shoe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP19800440001
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German (de)
French (fr)
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EP0019574A1 (en
Inventor
Edouard Singer
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.)
Individual
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Individual
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Filing date
Publication date
Priority claimed from FR7913298A external-priority patent/FR2456704A2/en
Priority claimed from FR8003533A external-priority patent/FR2476050B2/en
Application filed by Individual filed Critical Individual
Priority to AT80440001T priority Critical patent/ATE6417T1/en
Publication of EP0019574A1 publication Critical patent/EP0019574A1/en
Application granted granted Critical
Publication of EP0019574B1 publication Critical patent/EP0019574B1/en
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D3/00—Portable or mobile lifting or hauling appliances
    • B66D3/04—Pulley blocks or like devices in which force is applied to a rope, cable, or chain which passes over one or more pulleys, e.g. to obtain mechanical advantage
    • B66D3/06—Pulley blocks or like devices in which force is applied to a rope, cable, or chain which passes over one or more pulleys, e.g. to obtain mechanical advantage with more than one pulley
    • B66D3/10—Applications of braking or detent devices

Definitions

  • the invention relates to a lifting device, in particular a muffle.
  • the user actuates the handwheel so that the spring is no longer under tension and the brake can easily move away from the sliding sheave but fixed in rotation.
  • the brake practically no longer acts on the rope and does not cause any blockage of the sliding device on said rope.
  • the second flange has a frustoconical flank leading, on the one hand, to the outer periphery of the flange and, on the other hand, to a shoulder whereas the first flange comprises only a frustoconical flank but no shoulder.
  • the latter tends to be wedged between the frustoconical flank of the first flange and the corner of the shoulder of the second flange and risks bearing against the screw.
  • a brake lifting pulley is known.
  • This pulley has a fixed yoke fitted with a hook that attaches to the suspension point. Inside the yoke a brake shoe is fixed under the hook. This shoe follows the shape of the pulley and has a similar and opposite throat.
  • the yoke is spring-loaded by two return springs. At rest, the return springs hold the pulley against the shoe, causing the rope to be crushed. If you want to maneuver, you must exert a traction on the pulley either by means of an auxiliary rope attached to a hook secured to the yoke, or by means of a traction exerted on the free strand of the rope, the load being attached to the other strand.
  • the shoe does not act on the pulley but on the rope and only a pinch of the latter leading to crushing makes it possible to avoid sliding of the rope between the throat of the pulley and the throat of the shoe.
  • a lifting device in particular a block consisting of a yoke, provided at its upper part with a fastening member and formed by two parallel wings, one of which has a a notch, an axis and a sheave, mobile on this axis and placed between the two wings of the yoke.
  • This muffle comprises at least one fixed sheave threaded on one end of the axis projecting with respect to the wing of the yoke in which the notch is produced and on which one of the strands of the cord wound around the mobile sheave is capable of being wound up after passage through the notch made in the wing of the yoke interposed between the mobile sheave and the fixed sheave (s).
  • the present invention aims to remedy these drawbacks.
  • the invention solves the problem of creating a safety block making it possible, on the one hand, to bring down a relatively large weight of the order of a hundred kilograms with a low holding force of the order of six kilograms and, on the other hand, increase safety by pinching the strand of cord wound on the second fixed sheave.
  • the device 101 comprises a yoke 102 consisting of two vertical wings 103, 104.
  • the upper end 105 of these vertical wings 103, 104 is crossed by an axis 106 serving as a connection between the yoke 102 and a hooking member 107 such that 'a hook.
  • the two wings 103, 104 are crossed right through by an axis of rotation 108 around which pivots a mobile sheave 109.
  • first fixed sheave 114 1 mounted on the axis of rotation 108.
  • This first fixed sheave 114 also has a groove 127 in which is placed the rope 113 held by the flange 122, cover 121 1 .
  • the lower edge 128 of this fixed sheave 114 is located on the same horizontal plane as the lower edge 129 of the vertical wing 104, which allows the passage of the rope 113 from the mobile sheave 109 to the first fixed sheave 114 1 .
  • a second fixed sheave 114 2 also threaded on the axis of rotation 108.
  • This second fixed sheave 114 2 has two conical sides 116, and 116 2 including the small base 119, , 119 2 is integral with the hub 120.
  • the cord 113 is held by the flange 122 2 of the cover 121 2 .
  • the device 101 comprises a shoe 131 forming a brake.
  • This shoe 131 made of a non-slip material and, in particular of rubber, is mounted on a sliding plate made of glass fibers 132.
  • This plate 132 includes a vertical light 133 through which passes an axis 134 serving as an element of connection between the plate 132 and the vertical wing 103 of the yoke 102.
  • the shoe 131 has, at its lower part 135, the shape of a half-sheave provided with a groove 136 adapted to the rope used 113 and, at its upper part 137, a semi-toric boss 138 coming, under the action of the force applied to the rope, enter the groove 112 of the mobile sheave 109.
  • the rope 113 is partially wound around the mobile sheave 109 (see Figures 1 and 2).
  • the guarantor 123 of the rope 113 is wound around the shoe 131 by engaging it in the groove 136 then around the fixed sheave 114 1 .
  • the plate 132 and shoe 131 assembly slides upwards and the semi-toric boss 138 is introduced into the groove 112 of the mobile sheave 109.
  • the passage of the guarantor of the cord 113 of the shoe 131 towards the fixed sheave 114, is possible because the lower edge 128 of the fixed sheave 114, and the lower edge 129 of the vertical wing 104 are on the same horizontal plane.
  • the lifting device 201 comprises the yoke 202 composed of two vertical wings 203, 204. These two wings 203, 204 are crossed at their upper end by an axis 206 on which is threaded a hub 239 crossed vertically by a threaded axis 240 on which is screwed a hook 241 of the hooking member 207. On the rod 242 of this hook 241 is threaded a sleeve 243 crossed by an axis 244 ensuring the connection between said sleeve 243 and a locking element 245. This locking element 245 cooperates with the tip 246 of the hook 241 to prevent the rope from coming out of the loop 247 of the hook 241.
  • the two vertical wings 203, 204 are crossed by the axis of rotation 208.
  • this axis 208 is threaded between the internal faces 210, 211 of the vertical wings 203, 204 a needle sleeve 248 serving as a connection between said axis 208 and the mobile sheave 209.
  • This axis 208 also serves as a support for the first fixed sheave 214 1 .
  • the immobility in rotation of this fixed sheave 214 is ensured by a tongue 249 of the external face 226 of the vertical wing 204 engaging in a groove 250 made in the external face 251 of the fixed sheave 214 1 .
  • the lateral displacement of the axis of rotation 208 is annihilated, on the one hand, by a clamping element 255 screwed on the threaded end 256 and, on the other hand, by a shoulder 257 pressing against the second external face 252 of the first fixed sheave 214 1 .
  • the second fixed sheave 214 2 is composed of two flanges 258, 259.
  • Each flange 258, 259 has a frustoconical flank 260, 261 leading, on the one hand, to the outer periphery 262, 263 and, on the other hand, to a shoulder 264, 265.
  • the two shoulders 264, 265 face each other and come to bear against one another as a result of the action of at least one elastic element 266.
  • the two frustoconical sides 260, 261 form between them the groove 267 in which the free strand of the rope is housed.
  • This stop ring 271 has a conical hole 273 in which the head 274 of the axis 208 is embedded.
  • the device 201 comprises a shoe 231 crossed by an axis 234 serving as a connecting element between the shoe 231 and the vertical wing 203.
  • a plate 232 is threaded on this axis 234 held by a stop flange 275.
  • the shoe 231 has a vertical light 276.
  • the plate 232 is provided with a light 233 as well as the stop flange 275. Therefore, the assembly formed by the pad 231, the plate 232 and the stop flange 275 can slide vertically.
  • the shoe 231 has at its lower part 235 a groove 236 in which the rope is housed and at its upper part 237 a semi-toric boss 238 which, in the event of operation, engages in the groove 212 of the mobile sheave 209 and blocks this last.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Emergency Lowering Means (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)

Description

L'invention concerne un dispositif de levage, en particulier une moufle.The invention relates to a lifting device, in particular a muffle.

On connaît déjà, par la DE-A n° 2 237 622, un dispositif permettant l'évacuation de personnes en cas d'incendie. Ce dispositif est conçu de telle façon que la charge glisse le long de la corde accrochée à un endroit déterminé, c'est-à-dire que le dispositif glisse vers le bas en cas d'utilisation. Pour éviter que la descente soit trop rapide, ce dispositif prévoit un frein qui est mis en contact avec le réa coulissant par l'intermédiaire d'un ressort mis sous tension par un volant de manoeuvre pouvant être vissé ou dévissé sur un axe fileté. On actionne le volant de manoeuvre pour bloquer le dispositif sur la corde pour éviter une chute et un glissement rapides lorsque l'usager enjambe le rebord de la fenêtre. Ainsi, l'interaction pour le blocage du frein et du réa coulissant se fait en phase de repos par blocage manuel.Already known from DE-A No. 2 237 622, a device for the evacuation of people in the event of fire. This device is designed in such a way that the load slides along the rope hung at a determined location, that is to say that the device slides down when used. To prevent the descent from being too rapid, this device provides a brake which is brought into contact with the sliding sheave by means of a spring energized by a handwheel which can be screwed or unscrewed on a threaded axis. The handwheel is actuated to lock the device on the rope to avoid a rapid fall and slip when the user spans the window sill. Thus, the interaction for locking the brake and the sliding sheave is done in the rest phase by manual locking.

Pour descendre, l'usager actionne le volant de manoeuvre de sorte que le ressort n'est plus sous tension et le frein peut s'écarter facilement du réa coulissant mais fixe en rotation. En dévissant le volant de manoeuvre, le frein n'agit pratiquement plus sur la corde et ne provoque aucun blocage du dispositif coulissant sur ladite corde.To descend, the user actuates the handwheel so that the spring is no longer under tension and the brake can easily move away from the sliding sheave but fixed in rotation. By unscrewing the handwheel, the brake practically no longer acts on the rope and does not cause any blockage of the sliding device on said rope.

Toutefois, si, pour une raison ou pour une autre, l'usager n'a pas serré à fond le volant de manœuvre, en cas de chute, lorsque l'usager enjambe le rebord de la fenêtre, le dispositif glisse librement sur la corde.However, if, for one reason or another, the user has not fully tightened the handwheel, in the event of a fall, when the user spans the window sill, the device slides freely on the rope .

Par la DE-A n° 2 342 244, on connaît des perfectionnements apportés au dispositif ci-dessus. Ces perfectionnements concernent la fixation du dispositif d'évacuation sur le rebord de la fenêtre.From DE-A No. 2,342,244, improvements are made to the above device. These improvements relate to the fixing of the evacuation device on the window sill.

Toutefois, aucune modification n'a été apportée aux moyens de freinage formés par le frein, l'axe fileté, le ressort et le volant de manoeuvre. Les moyens utilisés, assurant le blocage du dispositif sur la corde, doivent permettre à l'usager d'enjamber le rebord de la fenêtre sans qu'il y ait risque de glissement du dispositif sur la corde. Lorsque l'usager s'est attaché au dispositif, il dévisse le volant de manoeuvre pour pouvoir descendre mais, en aucun cas, les moyens utilisés agissent lorsque, pour une raison ou pour une autre, l'usager fait une chute.However, no modification has been made to the braking means formed by the brake, the threaded pin, the spring and the handwheel. The means used, ensuring the blocking of the device on the rope, must allow the user to step over the window sill without there being any risk of the device sliding on the rope. When the user is attached to the device, he unscrews the handwheel in order to be able to descend but, in no case, the means used act when, for one reason or another, the user falls.

Par la DE-A n° 2 258 424, on connaît d'autres perfectionnements apportés au dispositif ci-dessus. Malgré la pluralité des pièces (six réas mobiles et deux freins), le système est le même. En effet, après avoir mis en place le dispositif et avant de l'utiliser, l'usager doit fortement serrer les moyens de freinage à l'aide de deux volants de manoeuvre avant d'enjamber le rebord de la fenêtre. Après s'être accroché et après avoir enjambé le rebord de la fenêtre, il est nécessaire que l'usager desserre les moyens de freinage à l'aide du premier volant de manoeuvre et, le cas échéant, le second volant de manoeuvre pour glisser vers le sol.From DE-A No. 2 258 424, other improvements made to the above device are known. Despite the plurality of parts (six mobile sheaves and two brakes), the system is the same. Indeed, after having set up the device and before using it, the user must tighten the braking means strongly using two handwheels before stepping over the window sill. After hanging on and after stepping over the window sill, the user must release the braking means using the first handwheel and, if necessary, the second handwheel to slide towards floor.

On connaît également par la DE-B n° 1 300 409 une moufle se composant de deux flasques. Le premier flasque peut être rapproché ou éloigné du second flasque en vissant ou en dévissant le flasque sur un moyeu fileté du second flasque, ceci en fonction du diamètre de la corde. Après réglage effectué en raison de ce diamètre, on agit sur des vis dont leurs extrémités s'engagent dans des évidements prévus dans le premier flasque pour éviter, lors de la rotation du réa mobile, un éloignement ou un rapprochement involontaire des deux flasques. Seul le second flasque comporte un flanc tronconique aboutant, d'une part, au pourtour extérieur du flasque et, d'autre part, à un épaulement alors que le premier flasque comporte uniquement un flanc tronconique mais pas d'épaulement. Ainsi, en cas d'écartement des deux flasques dû à une traction exercée sur la corde, cette dernière a tendance à se coincer entre le flanc tronconique du premier flasque et le coin de l'épaulement du second flasque et risque de prendre appui contre les vis.We also know from DE-B n ° 1 300 409 a muffle consisting of two flanges. The first flange can be moved towards or away from the second flange by screwing or unscrewing the flange on a threaded hub of the second flange, this depending on the diameter of the cord. After adjustment made because of this diameter, one acts on screws whose ends engage in recesses provided in the first flange to avoid, during the rotation of the mobile sheave, an involuntary distancing or bringing together of the two flanges. Only the second flange has a frustoconical flank leading, on the one hand, to the outer periphery of the flange and, on the other hand, to a shoulder whereas the first flange comprises only a frustoconical flank but no shoulder. Thus, in the event of separation of the two flanges due to a traction exerted on the cord, the latter tends to be wedged between the frustoconical flank of the first flange and the corner of the shoulder of the second flange and risks bearing against the screw.

Par ailleurs, on connaît par le brevet français n° 715 418, une poulie de levage à frein. Cette poulie comporte une chape fixe munie d'un crochet qui s'attache au point de suspension. A l'intérieur de la chape un sabot de frein est fixé sous le crochet. Ce sabot épouse la forme de la poulie et porte une gorge semblable et de sens contraire. La chape est rappelée élastiquement par deux ressorts de rappel. Au repos, les ressorts de rappel maintiennent la poulie contre le sabot en provoquant un certain écrasement de la corde. Si l'on veut manœuvrer, il faut exercer une traction sur la poulie soit par l'intermédiaire d'une corde auxiliaire attachée à un crochet solidaire de la chape, soit par l'intermédiaire d'une traction exercée sur le brin libre de la corde, la charge étant accrochée à l'autre brin. Toutefois, le sabot n'agit pas sur la poulie mais sur la corde et seul un pincement de celle-ci entraînant un écrasement permet d'éviter un glissement de la corde entre la gorge de la poulie et la gorge du sabot.Furthermore, from French Patent No. 715,418, a brake lifting pulley is known. This pulley has a fixed yoke fitted with a hook that attaches to the suspension point. Inside the yoke a brake shoe is fixed under the hook. This shoe follows the shape of the pulley and has a similar and opposite throat. The yoke is spring-loaded by two return springs. At rest, the return springs hold the pulley against the shoe, causing the rope to be crushed. If you want to maneuver, you must exert a traction on the pulley either by means of an auxiliary rope attached to a hook secured to the yoke, or by means of a traction exerted on the free strand of the rope, the load being attached to the other strand. However, the shoe does not act on the pulley but on the rope and only a pinch of the latter leading to crushing makes it possible to avoid sliding of the rope between the throat of the pulley and the throat of the shoe.

On connaît également, par la demande de brevet européen n° 675, un dispositif de levage, en particulier une moufle constituée d'une chape, pourvue à sa partie supérieure d'un organe d'accrochage et formée de deux ailes parallèles dont une présente une échancrure, d'un axe et d'un réa, mobile sur cet axe et placé entre les deux ailes de la chape. Cette moufle comporte au moins un réa fixe enfilé sur une extrémité de l'axe faisant saillie par rapport à l'aile de la chape dans laquelle l'échancrure est réalisée et sur lequel l'un des brins de la corde enroulée autour du réa mobile est susceptible d'être enroulé après passage à travers l'échancrure réalisée dans l'aile de la chape interposée entre le réa mobile et le ou les réas fixes.Also known from European patent application No. 675 is a lifting device, in particular a block consisting of a yoke, provided at its upper part with a fastening member and formed by two parallel wings, one of which has a a notch, an axis and a sheave, mobile on this axis and placed between the two wings of the yoke. This muffle comprises at least one fixed sheave threaded on one end of the axis projecting with respect to the wing of the yoke in which the notch is produced and on which one of the strands of the cord wound around the mobile sheave is capable of being wound up after passage through the notch made in the wing of the yoke interposed between the mobile sheave and the fixed sheave (s).

Toutefois, on a constaté que, lorsque l'on enroule le brin libre de la corde autour du second réa fixe, l'utilisateur agissant fréquemment d'une manière affolée, cet enroulement n'est pas assez serré et on risque que la corde continue à glisser, notamment lorsque la charge suspendue à l'autre brin de la corde est lourde et que la traction exercée sur ce brin est forte et brutale par suite d'une chute de la charge.However, it has been found that, when the free strand of the rope is wrapped around the second fixed sheave, the user frequently acting in a panic, this winding is not enough tight and there is a risk that the rope continues to slide, especially when the load suspended on the other strand of the rope is heavy and that the traction exerted on this strand is strong and brutal as a result of a fall in the load.

Par ailleurs, il s'est avéré nécessaire, au cours d'expériences, de bloquer également le réa mobile de sorte qu'aucune pièce constituant le dispositif de levage ne soit en mouvement.Furthermore, it has proved necessary, during experiments, to also block the mobile sheave so that no part constituting the lifting device is in motion.

La présente invention a pour but de remédier à ces inconvénients.The present invention aims to remedy these drawbacks.

L'invention, telle qu'elle est caractérisée dans les revendications, résout le problème consistant à créer une moufle de sécurité permettant, d'une part, de faire descendre un poids relativement important de l'ordre d'une centaine de kilogrammes avec une force de retenue faible de l'ordre de six kilogrammes et, d'autre part, augmenter la sécurité en pinçant le brin de corde enroulé sur le second réa fixe.The invention, as characterized in the claims, solves the problem of creating a safety block making it possible, on the one hand, to bring down a relatively large weight of the order of a hundred kilograms with a low holding force of the order of six kilograms and, on the other hand, increase safety by pinching the strand of cord wound on the second fixed sheave.

L'invention est exposée ci-après plus en détail à l'aide de dessins représentant seulement un mode d'exécution.

  • La figure 1 représente, en vue en élévation, le dispositif de levage réalisé conformément à la présente invention, le réa mobile étant en phase d'utilisation normale ;
  • la figure 2 représente une vue latérale de la figure 1 ;
  • la figure 3 représente, en vue en élévation, le dispositif de levage réalisé conformément à la présente invention, le réa mobile étant en phase d'utilisation en descenseur ;
  • la figure 4 représente une vue latérale de la figure 3 ;
  • la figure 5 représente, en vue en élévation, le dispositif de levage réalisé conformément à la présente invention, le réa mobile étant bloqué ;
  • la figure 6 représente une vue latérale de la figure 5 ;
  • la figure 7 représente, en vue en coupe et en élévation, le dispositif de levage pourvu d'un réa fixe élastique.
The invention is set out below in more detail with the aid of drawings representing only one embodiment.
  • FIG. 1 shows, in elevation view, the lifting device produced in accordance with the present invention, the mobile sheave being in the normal use phase;
  • Figure 2 shows a side view of Figure 1;
  • FIG. 3 shows, in elevation view, the lifting device produced in accordance with the present invention, the mobile sheave being in the phase of use in a descender;
  • Figure 4 shows a side view of Figure 3;
  • FIG. 5 shows, in elevation view, the lifting device produced in accordance with the present invention, the mobile sheave being blocked;
  • Figure 6 shows a side view of Figure 5;
  • Figure 7 shows, in sectional view and in elevation, the lifting device provided with a fixed elastic sheave.

On se réfère aux figures 1 à 6.We refer to Figures 1 to 6.

Le dispositif 101 comporte une chape 102 constituée de deux ailes verticales 103, 104. L'extrémité supérieure 105 de ces ailes verticales 103, 104 est traversée par un axe 106 servant de liaison entre la chape 102 et un organe d'accrochage 107 tel qu'un crochet. Les deux ailes 103, 104 sont traversées de part en part par un axe de rotation 108 autour duquel pivote un réa mobile 109.The device 101 comprises a yoke 102 consisting of two vertical wings 103, 104. The upper end 105 of these vertical wings 103, 104 is crossed by an axis 106 serving as a connection between the yoke 102 and a hooking member 107 such that 'a hook. The two wings 103, 104 are crossed right through by an axis of rotation 108 around which pivots a mobile sheave 109.

On applique contre la face externe 126 de l'aile verticale 104 un premier réa fixe 1141 monté sur l'axe de rotation 108. Ce premier réa fixe 114, comporte également une gorge 127 dans laquelle vient se placer la corde 113 maintenue par le rebord 122, du capot 1211. Le bord inférieur 128 de ce réa fixe 114, est situé sur un même plan horizontal tel que le chant inférieur 129 de l'aile verticale 104, ce qui permet le passage de la corde 113 depuis le réa mobile 109 vers le premier réa fixe 1141.Is applied against the outer face 126 of the vertical wing 104 a first fixed sheave 114 1 mounted on the axis of rotation 108. This first fixed sheave 114, also has a groove 127 in which is placed the rope 113 held by the flange 122, cover 121 1 . The lower edge 128 of this fixed sheave 114 is located on the same horizontal plane as the lower edge 129 of the vertical wing 104, which allows the passage of the rope 113 from the mobile sheave 109 to the first fixed sheave 114 1 .

On dispose contre la face externe 130 du premier réa fixe 114, un second réa fixe 1142 également enfilé sur l'axe de rotation 108. Ce second réa fixe 1142 comporte deux flancs coniques 116, et 1162 dont la petite base 119,, 1192 est solidaire du moyeu 120. La corde 113 est maintenue par le rebord 1222 du capot 1212.There is against the external face 130 of the first fixed sheave 114, a second fixed sheave 114 2 also threaded on the axis of rotation 108. This second fixed sheave 114 2 has two conical sides 116, and 116 2 including the small base 119, , 119 2 is integral with the hub 120. The cord 113 is held by the flange 122 2 of the cover 121 2 .

Selon l'invention, le dispositif 101 comporte un patin 131 formant frein. Ce patin 131, réalisé dans une matière anti-dérapante et, en particulier en caoutchouc, est monté sur une plaque coulissante en fibres de verre 132. Cette plaque 132 comporte une lumière verticale 133 à travers laquelle passe un axe 134 servant d'élément de liaison entre la plaque 132 et l'aile verticale 103 de la chape 102.According to the invention, the device 101 comprises a shoe 131 forming a brake. This shoe 131, made of a non-slip material and, in particular of rubber, is mounted on a sliding plate made of glass fibers 132. This plate 132 includes a vertical light 133 through which passes an axis 134 serving as an element of connection between the plate 132 and the vertical wing 103 of the yoke 102.

Le patin 131 a, à sa partie inférieure 135, la forme d'un demi-réa pourvu d'une gorge 136 adaptée à la corde employée 113 et, à sa partie supérieure 137, un bossage semi-torique 138 venant, sous l'action de la force appliquée sur la corde, s'introduire dans la gorge 112 du réa mobile 109.The shoe 131 has, at its lower part 135, the shape of a half-sheave provided with a groove 136 adapted to the rope used 113 and, at its upper part 137, a semi-toric boss 138 coming, under the action of the force applied to the rope, enter the groove 112 of the mobile sheave 109.

En cas d'utilisation normale du dispositif 101, la corde 113 s'enroule partiellement autour du réa mobile 109 (voir figures 1 et 2).In normal use of the device 101, the rope 113 is partially wound around the mobile sheave 109 (see Figures 1 and 2).

En phase de descenseur (voir figures 3 et 4), on enroule le garant 123 de la corde 113 autour du patin 131 en l'engageant dans la gorge 136 puis autour du réa fixe 1141. Sous l'effet de l'action appliquée à la corde 113, l'ensemble plaque 132 et patin 131 coulisse vers le haut et le bossage semi-torique 138 s'introduit dans la gorge 112 du réa mobile 109. Le passage du garant de la corde 113 du patin 131 vers le réa fixe 114, est possible du fait que le bord inférieur 128 du réa fixe 114, et le chant inférieur 129 de l'aile verticale 104 sont sur un même plan horizontal.In the descender phase (see FIGS. 3 and 4), the guarantor 123 of the rope 113 is wound around the shoe 131 by engaging it in the groove 136 then around the fixed sheave 114 1 . Under the effect of the action applied to the rope 113, the plate 132 and shoe 131 assembly slides upwards and the semi-toric boss 138 is introduced into the groove 112 of the mobile sheave 109. The passage of the guarantor of the cord 113 of the shoe 131 towards the fixed sheave 114, is possible because the lower edge 128 of the fixed sheave 114, and the lower edge 129 of the vertical wing 104 are on the same horizontal plane.

Pour bloquer le dispositif 101, il suffit de continuer l'enroulement du garant et de le passer depuis le premier réa fixe 114, sur le second réa fixe 1142 (voir figures 5 et 6).To block the device 101, it suffices to continue winding the guarantor and pass it from the first fixed sheave 114, to the second fixed sheave 114 2 (see FIGS. 5 and 6).

On se réfère à la figure 7.We refer to figure 7.

Le dispositif de levage 201 comporte la chape 202 composée de deux ailes verticales 203, 204. Ces deux ailes 203, 204 sont traversées à leur extrémité supérieure par un axe 206 sur lequel est enfilé un moyeu 239 traversé verticalement par un axe fileté 240 sur lequel est vissé un crochet 241 de l'organe d'accrochage 207. Sur la tige 242 de ce crochet 241 est enfilée une douille 243 traversée par un axe 244 assurant la liaison entre ladite douille 243 et un élément de verrouillage 245. Cet élément de verrouillage 245 coopère avec la pointe 246 du crochet 241 pour éviter que la corde ne sorte de la boucle 247 du crochet 241.The lifting device 201 comprises the yoke 202 composed of two vertical wings 203, 204. These two wings 203, 204 are crossed at their upper end by an axis 206 on which is threaded a hub 239 crossed vertically by a threaded axis 240 on which is screwed a hook 241 of the hooking member 207. On the rod 242 of this hook 241 is threaded a sleeve 243 crossed by an axis 244 ensuring the connection between said sleeve 243 and a locking element 245. This locking element 245 cooperates with the tip 246 of the hook 241 to prevent the rope from coming out of the loop 247 of the hook 241.

Par ailleurs, les deux ailes verticales 203, 204 sont traversées par l'axe de rotation 208. On enfile sur cet axe 208 entre les faces internes 210, 211 des ailes verticales 203, 204 une douille à aiguilles 248 servant de liaison entre ledit axe 208 et le réa mobile 209. Cet axe 208 sert également de support au premier réa fixe 2141. L'immobilité en rotation de ce réa fixe 214, est assurée par une languette 249 de la face externe 226 de l'aile verticale 204 s'engageant dans une rainure 250 pratiquée dans la face externe 251 du réa fixe 2141. Sur la seconde face externe 252 du réa fixe 2141 est appliqué le capot en élastomère 221. Celui-ci comporte sur sa face externe 230 une rainure 253 dans laquelle s'engage une languette 254 du second réa fixe 2142.Furthermore, the two vertical wings 203, 204 are crossed by the axis of rotation 208. On this axis 208 is threaded between the internal faces 210, 211 of the vertical wings 203, 204 a needle sleeve 248 serving as a connection between said axis 208 and the mobile sheave 209. This axis 208 also serves as a support for the first fixed sheave 214 1 . The immobility in rotation of this fixed sheave 214 is ensured by a tongue 249 of the external face 226 of the vertical wing 204 engaging in a groove 250 made in the external face 251 of the fixed sheave 214 1 . On the second external face 252 of the fixed sheave 214 1 is applied the elastomer cover 221. This comprises on its external face 230 a groove 253 in which engages a tongue 254 of the second fixed sheave 214 2 .

Le déplacement latéral de l'axe de rotation 208 est annihilé, d'une part, par un élément de serrage 255 vissé sur l'extrémité filetée 256 et, d'autre part, par un épaulement 257 s'appliquant contre la seconde face externe 252 du premier réa fixe 2141.The lateral displacement of the axis of rotation 208 is annihilated, on the one hand, by a clamping element 255 screwed on the threaded end 256 and, on the other hand, by a shoulder 257 pressing against the second external face 252 of the first fixed sheave 214 1 .

Le second réa fixe 2142 se compose de deux flasques 258, 259. Chaque flasque 258, 259 comporte un flanc tronconique 260, 261 aboutant, d'une part, au pourtour externe 262, 263 et, d'autre part, à un épaulement 264, 265. Les deux épaulements 264, 265 se font face et viennent s'appliquer l'un contre l'autre par suite de l'action d'au moins un élément élastique 266. Les deux flancs tronconiques 260, 261 forment entre eux la gorge 267 dans laquelle vient se loger le brin libre de la corde. L'élément élastique 266, disposé dans un logement 268 pratiqué dans la face externe 269 du second flasque 259, est maintenu, d'une part, par le fond 270 du logement 268 et, d'autre part, par une bague d'arrêt 271 coulissant dans un décrochement 272 aboutant au logement 268. Cette bague d'arrêt 271 présente un trou conique 273 dans lequel est noyée la tête 274 de l'axe 208.The second fixed sheave 214 2 is composed of two flanges 258, 259. Each flange 258, 259 has a frustoconical flank 260, 261 leading, on the one hand, to the outer periphery 262, 263 and, on the other hand, to a shoulder 264, 265. The two shoulders 264, 265 face each other and come to bear against one another as a result of the action of at least one elastic element 266. The two frustoconical sides 260, 261 form between them the groove 267 in which the free strand of the rope is housed. The elastic element 266, disposed in a housing 268 formed in the external face 269 of the second flange 259, is held, on the one hand, by the bottom 270 of the housing 268 and, on the other hand, by a stop ring 271 sliding in a recess 272 leading to the housing 268. This stop ring 271 has a conical hole 273 in which the head 274 of the axis 208 is embedded.

Lorsque l'utilisateur enroule le brin libre de la corde autour du second réa fixe 2142, le flasque 259 s'écarte du flasque 258 et l'élément élastique 266 est comprimé. En relâchant la traction exercée sur ce brin libre, l'élément élastique 266 agit et pousse le second flasque 259 vers le flasque 258. De ce fait, le brin libre de la corde est pincé entre les deux flancs tronconiques 260, 261.When the user winds the free strand of the rope around the second fixed sheave 214 2 , the flange 259 moves away from the flange 258 and the elastic element 266 is compressed. By releasing the traction exerted on this free strand, the elastic element 266 acts and pushes the second flange 259 towards the flange 258. As a result, the free strand of the cord is pinched between the two frustoconical flanks 260, 261.

Le dispositif 201 comporte un patin 231 traversé par un axe 234 servant d'élément de liaison entre le patin 231 et l'aile verticale 203. On enfile sur cet axe 234 une plaque 232 maintenue par un flasque d'arrêt 275. Le patin 231 présente une lumière verticale 276. De même, la plaque 232 est pourvue d'une lumière 233 ainsi que le flasque d'arrêt 275. De ce fait, l'ensemble formé par le patin 231, la plaque 232 et le flasque d'arrêt 275 peut coulisser verticalement. Le patin 231 comporte à sa partie inférieure 235 une gorge 236 dans laquelle est logée la corde et à sa partie supérieure 237 un bossage semi-torique 238 qui, en cas de fonctionnement, s'engage dans la gorge 212 du réa mobile 209 et bloque ce dernier.The device 201 comprises a shoe 231 crossed by an axis 234 serving as a connecting element between the shoe 231 and the vertical wing 203. A plate 232 is threaded on this axis 234 held by a stop flange 275. The shoe 231 has a vertical light 276. Similarly, the plate 232 is provided with a light 233 as well as the stop flange 275. Therefore, the assembly formed by the pad 231, the plate 232 and the stop flange 275 can slide vertically. The shoe 231 has at its lower part 235 a groove 236 in which the rope is housed and at its upper part 237 a semi-toric boss 238 which, in the event of operation, engages in the groove 212 of the mobile sheave 209 and blocks this last.

Claims (8)

1. A lifting device, especially a pulley block composed of a shell (102 ; 202) provided, in its upper part, with a hanging element (107 ; 207) and made of two parallel wings (103, 104; 203, 204) one of which (104 ; 204) has a notch (115) ; an axis (108 ; 208) ; a sheave (109 ; 209) movable on said axis (108 ; 208) and situated between the two wings (103, 104 ; 203, 204) of the shell (102 ; 202) ; and at least two fixed sheaves (1141, 1142 ; 2141, 2142) placed on an end of the axis (108 ; 208) projecting with respect to the wing (104 204) of the shell (102 ; 202) in which the notch (115) is realized, fixed sheaves on which one of the tackle-falls (123) of the rope (113) wound about the movable sheave (109 ; 209) is apt to be wound after passage through the notch (115) made in the wing (104) of the shell (102) interposed between the movable sheave (109 ; 209) and the fixed sheaves (1141, 1142 ; 2141, 2142), characterized in that it comprises a shoe (131 ; 231) co-operating with the movable sheave (109 ; 209) in order to be able to immobilize the latter, the shoe (131 ; 231) being mounted on a sliding plate (132 ; 232) brought back toward the centre of the movable sheave (109 : 209) by the tackle- fall (123) of the rope (113) passed, in downward step, on the lower part (135 ; 235) of the shoe (131 ; 231) before to be passed on the fixed sheaves (1141, 1142 ; 2141, 2142).
2. A lifting device according to claim 1, wherein the shoe (131 ; 231) comprises a lower part (135 ; 235) having the shape of a half-sheave provided with a groove (136 ; 236) adapted to the used rope (113).
3. A lifting device according to claim 1, wherein the plate (132 ; 232), composed of glass fibres, comprises a vertical aperture (133 ; 233) through which passes an axis (134 ; 234) serving as linking element between the whole shoe (131 ; 231), plate (132 ; 232) and one of the vertical wings (103 ; 203) of the shell (102 ; 202) being used as support for the movable sheave (109 ; 209).
4. A lifting device according to claim 1, wherein the second fixed sheave (2142) comprises a mobile web (259) provided with means of automatic return (266) bringing back the mobile web (259) to its rest position after its spacing from the fixed web (258) due to a tractive effort exerted by the rope.
5. A lifting device according to claim 4, wherein the mobile web (259) comprises a housing (268) made in its external face (269), in which is placed at least a resilient element (266) ensuring the elastic return of the mobile web (259).
6. A lifting device according to any one of the claims 4 and 5, wherein the housing (268) comprises an unhooking (272) serving as housing for a stop-collar (271) maintaining the elastic elements (266) under tension.
7. A lifting device according to claim 6, wherein the stop-collar (271) comprises a cone-shaped hole (273) in which is counter sunk the head (274) of the axis (208).
8. A lifting device according to claim 1, wherein the second fixed sheave comprises a groove (267) whose bottom is made of two shoulders (264, 265) and whose sides are composed of the truncated cone-shaped flanks (260, 261) of the two webs (258, 259).
EP19800440001 1979-05-18 1980-05-09 Lifting device, especially pulley block Expired EP0019574B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80440001T ATE6417T1 (en) 1979-05-18 1980-05-09 LIFTING DEVICE, PARTICULARLY PULLEY LIFT.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR7913298A FR2456704A2 (en) 1977-07-27 1979-05-18 Braking system for pulley block - utilises tension in rope to press rubber shoe into pulley groove
FR7913298 1979-05-18
FR8003533A FR2476050B2 (en) 1977-07-27 1980-02-14 LIFTING DEVICE, PARTICULARLY MOUFLE
FR8003533 1980-02-14

Publications (2)

Publication Number Publication Date
EP0019574A1 EP0019574A1 (en) 1980-11-26
EP0019574B1 true EP0019574B1 (en) 1984-02-29

Family

ID=26221176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800440001 Expired EP0019574B1 (en) 1979-05-18 1980-05-09 Lifting device, especially pulley block

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Country Link
EP (1) EP0019574B1 (en)
DE (1) DE3066740D1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2494247A2 (en) * 1980-11-19 1982-05-21 Singer Edouard LIFTING DEVICE IN PARTICULAR MITTEN

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE128109C (en) *
NL28404C (en) * 1900-01-01
FR442199A (en) * 1911-04-26 1912-08-26 Charles Dewever Friction winch for rescue in case of fire
US1636273A (en) * 1927-01-15 1927-07-19 Arnold W Baker Pulley block
GB287907A (en) * 1927-03-29 1928-05-31 Ane Pieter Schat Improvements in pulley blocks
FR677148A (en) * 1929-06-20 1930-03-04 Hoist for goods, bicycles, etc.
FR715418A (en) * 1930-08-21 1931-12-03 Brake hoist pulley
FR1408799A (en) * 1964-07-06 1965-08-20 Usines Du Paquis Sa Des Mitten
GB1132211A (en) * 1966-01-26 1968-10-30 Paul Bert Elvstrom A sheave device
JPS499333Y1 (en) * 1970-11-24 1974-03-05
DE2342244A1 (en) * 1972-07-31 1975-02-27 Heri Dipl Ing Schuller Abseil appts for fire rescue - has securing pin guided relative to bollard axis and brake surface nails to bound cable motion
DE2237622C3 (en) * 1972-07-31 1975-02-20 Heri Dipl.-Ing. 8124 Seeshaupt Schuller Descender for rescue from fire hazard
DE2258424A1 (en) * 1972-11-29 1974-05-30 Heri Dipl-Ing Schuller SINGLE-ROPE DESCENT DEVICE

Also Published As

Publication number Publication date
EP0019574A1 (en) 1980-11-26
DE3066740D1 (en) 1984-04-05

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