EP0802274A1 - Method of manufacturing a cord grommet and grommet thus obtained - Google Patents

Method of manufacturing a cord grommet and grommet thus obtained Download PDF

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Publication number
EP0802274A1
EP0802274A1 EP97450006A EP97450006A EP0802274A1 EP 0802274 A1 EP0802274 A1 EP 0802274A1 EP 97450006 A EP97450006 A EP 97450006A EP 97450006 A EP97450006 A EP 97450006A EP 0802274 A1 EP0802274 A1 EP 0802274A1
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EP
European Patent Office
Prior art keywords
diameter
rope
strop
core
end portions
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EP97450006A
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German (de)
French (fr)
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EP0802274B1 (en
Inventor
Guy Fargamel
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G. FARGAMEL, S.A.
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Individual
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    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/16—Auxiliary apparatus
    • D07B7/165—Auxiliary apparatus for making slings

Definitions

  • the present invention relates to a method of manufacturing a rope strop and the strop thus obtained.
  • a finished strop is thus obtained, that is to say a loop comprising five strands of the same rope on a core formed by the ends of this rope.
  • Known strops have only five strands, so that the resistance is decreased compared to a strop comprising six strands which is mechanically logical but also because of the tight stranding pitch which leads to more pronounced angles which makes lose resistance to the whole.
  • the number five is determined by the geometric rules which make it possible to accommodate six circles of a given diameter around and tangent to a central circle of the same diameter, but that it is impossible to accommodate six oval sections whose large diameter is substantially parallel to a tangent to the central circle.
  • the present invention provides a method of manufacturing a strand with six strands which is of a resistance of the order of 20% greater because on the one hand, a sixth strand is provided and on the other hand, The stranding angle is reduced to reduce the large diameter of the oval cross section of each strand so that it also contributes to the increase in final strength. Indeed, the pitch is much larger and it is no longer necessary to fill the clearances between the strands.
  • the method according to the invention is economical, especially in its main embodiment, and it does not require any investment for a company in the environment in question, manufacturing such products.
  • the subject of the invention is also the strand with six strands thus obtained.
  • FIG. 1 there is shown a strop 10 with, externally, strands on a core 12, symbolized in broken lines in this figure, with a point of penetration 14 of the free end portions 16 and 18 of the stranding cord 20 , forming said core, with a junction point 19.
  • the method according to the invention makes it possible to produce a strop whose cross section is shown in FIG. 3.
  • This strop comprises six strands I , II , III , IV , V and VI of a diameter D2 around a core 12 of a diameter D1 .
  • Each strand is an ellipse whose minor axis d1, equal to D2 , is of a dimension smaller than that of the major axis d2 .
  • the major axis d2 is very slightly less than or equal to D1 , since only six circles can be accommodated with a point of tangency at the periphery of a circle of the same diameter.
  • the diameter D2 must be less than D1 .
  • FIG. 4A Prior to the realization of the strop itself, a special treatment of the rope is provided, FIG. 4A, in order to reduce the diameter of this rope in a given area.
  • the rope is chosen from among the ropes made of a material which allows them to have a certain capacity to contract and therefore to restrict their diameter when they are stretched and which retains this reduced diameter even after traction has ceased.
  • the method consists in preparing a length of rope necessary for the realization of the strop, that is to say approximately 7.5 times the average perimeter C of this strop. Account must be taken of the elongation that this rope will undergo during the implementation of the method as will be explained later.
  • This rope has a nominal nominal diameter.
  • the rope is then immobilized in clamping means 20, symbolized in this FIG. 4A, at precise points located, in the case of a symmetrical core of a length C , at a minimum of 1/2 C of the free end.
  • a traction is then exerted between these two tightening means to ensure the stretching of the cord, in the only middle part, comprised between the tightening means, the diameter of the cord passing from D1 to D2 , with D2 ⁇ D1 .
  • the rope After loosening the tensile force, the rope retains this diameter D2 , in its middle part.
  • the middle part of the strop of the strop at diameter D2 is stranded on a mold 22 which is for example a steel wire, at diameter D1 .
  • the mold is then withdrawn through the strands to the right of the point of introduction 14 and, simultaneously, the end portions of the rope, of diameter D1 , are made to enter the free volume left by the progressive withdrawal of the mold, this with methods known to those skilled in the art.

Abstract

The cord pulley block strap is formed by cutting a length of cord to form a strap of a given circumference (C). A section of the cord, for the central core, is taken at each end of a length which is one half C. The cord thickness is modified, at the centre and end sections, to give one dia. (D1) at the ends and a second dia. (D2) at the centre. the cord is twisted six times round a former with the first dia. (D1) to form a hawser. The former is withdrawn, and the ends are inserted into the opening to form the core.

Description

La présente invention concerne un procédé de fabrication d'une estrope en cordage et l'estrope ainsi obtenue.The present invention relates to a method of manufacturing a rope strop and the strop thus obtained.

On connaît les estropes qui sont des cordages en boucle fermée, multitorons dont les extrémités sont réintroduites en tant qu'âme de la boucle coaxialement au grelin extérieur, enroulé de façon hélicoïdale.We know strops which are closed loop, multi-strand ropes whose ends are reintroduced as the core of the loop coaxially with the outer shroud, wound helically.

Actuellement, les estropes connues sont réalisées par la succession des étapes suivantes :

  • utilisation d'un moule, c'est-à-dire d'une forme d'un diamètre sensiblement identique au diamètre du cordage dans lequel l'estrope doit être réalisée, d'une longueur correspondant sensiblement à celle de la longueur développée de l'estrope à obtenir,
  • toronnage d'un cordage cinq fois sur ledit moule avec un pas suffisamment serré pour limiter les jeux entre les cordages et immobiliser ces torons les uns contre les autres,
  • retrait du moule en un point dit de pénétration, avec introduction simultanée des extrémités libres du cordage ayant servi au toronnage, la longueur des extrémités libres ayant été calculée pour assurer la pénétration du cordage sur une longueur voulue, prédéterminée, en fonction du coefficient de frottement du cordage et d'autres paramètres relevant du savoir-faire et non de l'invention. Cette longueur est généralement égale à une 1/2 longueur développée de l'estrope.
Currently, the known strops are produced by the succession of the following stages:
  • use of a mold, that is to say of a shape with a diameter substantially identical to the diameter of the rope in which the strop is to be made, of a length corresponding substantially to that of the developed length of the strop to get,
  • stranding a line five times on said mold with a sufficiently tight pitch to limit the clearances between the lines and immobilize these strands against each other,
  • withdrawal of the mold at a point of penetration, with simultaneous introduction of the free ends of the cord used for stranding, the length of the free ends having been calculated to ensure the penetration of the cord over a desired length, predetermined, according to the coefficient of friction stringing and other parameters relating to know-how and not to the invention. This length is generally equal to a 1/2 developed length of the strop.

On obtient ainsi une estrope finie, c'est-à-dire une boucle comprenant cinq toronnages du même cordage sur une âme constituée par les extrémités de ce cordage.A finished strop is thus obtained, that is to say a loop comprising five strands of the same rope on a core formed by the ends of this rope.

Les estropes connues n'ont que cinq toronnages, si bien que la résistance est diminuée par rapport à une estrope comprenant six toronnages ce qui est mécaniquement logique mais aussi à cause du pas resserré de toronnage qui conduit à des angles plus prononcés ce qui fait perdre de la résistance à l'ensemble.Known strops have only five strands, so that the resistance is decreased compared to a strop comprising six strands which is mechanically logical but also because of the tight stranding pitch which leads to more pronounced angles which makes lose resistance to the whole.

Le nombre cinq est déterminé par les règles géométriques qui font qu'il est possible de loger six cercles d'un diamètre donné autour d'un cercle central de même diamètre et tangents à celui-ci, mais qu'il est impossible de loger six sections ovales dont le grand diamètre est sensiblement parallèle à une tangente au cercle central.The number five is determined by the geometric rules which make it possible to accommodate six circles of a given diameter around and tangent to a central circle of the same diameter, but that it is impossible to accommodate six oval sections whose large diameter is substantially parallel to a tangent to the central circle.

En effet, le cordage étant toronné de façon hélicoïdale sur le cordage central formant âme ou sur le moule lors de la fabrication, sur la figure 2 "art antérieur", une coupe droite de l'estrope montre bien cette section ovale et non ronde des torons, le cordage central ou le moule ayant une section parfaitement ronde, et on comprend l'impossibilité de disposer six torons.In fact, the cord being twisted helically on the central cord forming the core or on the mold during manufacture, in FIG. 2 "prior art", a straight section of the strop clearly shows this oval and non-round section of the strands, the central cord or the mold having a perfectly round section, and we understand the impossibility of having six strands.

Néanmoins, la présente invention propose un procédé de fabrication d'une estrope à six torons qui est d'une résistance de l'ordre de 20 % supérieure car d'une part, il est prévu un sixième toron et d'autre part, l'angle de toronnage est diminué pour faire en sorte de diminuer le grand diamètre de la section droite ovale de chaque toron si bien que cela contribue aussi à l'augmentation de la résistance finale. En effet, le pas est beaucoup plus grand et il n'est plus nécessaire de combler les jeux entre les torons.However, the present invention provides a method of manufacturing a strand with six strands which is of a resistance of the order of 20% greater because on the one hand, a sixth strand is provided and on the other hand, The stranding angle is reduced to reduce the large diameter of the oval cross section of each strand so that it also contributes to the increase in final strength. Indeed, the pitch is much larger and it is no longer necessary to fill the clearances between the strands.

De plus le procédé selon l'invention est économique, surtout dans son mode principal de réalisation, et il n'oblige à aucun investissement pour une entreprise du milieu considéré, fabriquant de tels produits.In addition, the method according to the invention is economical, especially in its main embodiment, and it does not require any investment for a company in the environment in question, manufacturing such products.

A cet effet, le procédé de fabrication d'une estrope de périmètre C selon l'invention, à partir d'un seul et même cordage de diamètre D1, comprenant une âme sur laquelle sont positionnés des torons, les extrémités dudit cordage constituant cette âme avec un point de pénétration de ces extrémités, se caractérise en ce qu'il comprend les étapes suivantes :

  • découpe d'une longueur de cordage L nécessaire pour la fabrication de l'estrope de périmètre C,
  • détermination d'une partie médiane du cordage pour former l'âme centrale et de deux portions d'extrémité, sensiblement égale à 1/2 C, réservées de part et d'autre de la partie médiane,
  • modification des diamètres relatifs de la partie médiane et des portions d'extrémité, pour conférer un diamètre D1 aux portions d'extrémités et un diamètre D2 à la partie médiane,
  • toronnage de six torons autour d'un moule de diamètre D1, à partir d'un point dit de pénétration de l'estrope,
  • retrait du moule par le point de pénétration, et
  • introduction des portions d'extrémité en lieu et place du moule pour former l'âme de l'estrope.
To this end, the method of manufacturing a strop of perimeter C according to the invention, from a single rope of diameter D1, comprising a core on which strands are positioned, the ends of said rope constituting this core with a point of penetration of these ends, is characterized in that it comprises the following stages:
  • cutting a length of rope L necessary for the manufacture of the strop of perimeter C ,
  • determination of a middle part of the rope to form the central core and of two end portions, substantially equal to 1/2 C , reserved on either side of the middle part,
  • modification of the relative diameters of the middle part and the end portions, to give a diameter D1 to the end portions and a diameter D2 to the middle part,
  • stranding of six strands around a mold of diameter D1 , from a point called penetration of the strop,
  • withdrawal of the mold by the point of penetration, and
  • introduction of the end portions in place of the mold to form the core of the strop.

Selon un mode de réalisation préféré du procédé, la modification de diamètre est obtenue par les étapes suivantes :

  • utilisation d'un cordage de diamètre nominal ayant des capacités à conserver un diamètre restreint D2 lorsqu'il est étiré,
  • étirage de la partie médiane pour lui conférer un diamètre D2<D1, le diamètre D1 des portions d'extrémité étant conservé, afin que les torons soient réalisés à partir d'un cordage de diamètre D2, autour d'une âme de diamètre D1.
According to a preferred embodiment of the method, the diameter modification is obtained by the following steps:
  • use of a nominal diameter rope having the capacity to keep a restricted diameter D2 when it is stretched,
  • stretching the middle part to give it a diameter D2 <D1, the diameter D1 of the end portions being preserved, so that the strands are made from a rope of diameter D2, around a core of diameter D1.

Selon une variante du procédé :

  • on utilise un cordage de diamètre nominal D1,
  • on réalise une surépaisseur des portions d'extrémité pour leur conférer un diamètre D'2 telle que D'2>D1, afin que les torons soient réalisés à partir d'un cordage de diamètre D1, autour d'une âme de diamètre D'2.
According to a variant of the process:
  • a rope of nominal diameter D1 is used ,
  • an extra thickness is made of the end portions to give them a diameter D'2 such that D'2 > D1 , so that the strands are made from a rope of diameter D1 , around a core of diameter D'2.

L'invention a aussi pour objet l'estrope à six torons ainsi obtenue.The subject of the invention is also the strand with six strands thus obtained.

Le procédé selon l'invention est décrit ci-après selon un mode de réalisation particulier, non-limitatif, en regard des dessins annexés, sur lesquels les figures représentent :

  • figure 1, une vue en perspective d'une estrope,
  • figure 2, une vue d'une section d'une estrope selon l'art antérieur,
  • figure 3, une vue d'une section d'une estrope selon la présente invention,
  • figures 4A à figures 4C, une vue des différentes étapes du procédé de fabrication de l'estrope selon la présente invention, montrée figure 3.
The method according to the invention is described below according to a particular, non-limiting embodiment, with reference to the appended drawings, in which the figures represent:
  • FIG. 1, a perspective view of a strop,
  • FIG. 2, a view of a section of a strop according to the prior art,
  • FIG. 3, a view of a section of a strop according to the present invention,
  • FIGS. 4A to FIGS. 4C, a view of the different stages of the method of manufacturing the strop according to the present invention, shown in FIG. 3.

Sur la figure 1, on a représenté une estrope 10 avec, extérieurement, des torons sur une âme 12, symbolisée en trait discontinu sur cette figure, avec un point de pénétration 14 des portions libres d'extrémité 16 et 18 du cordage 20 de toronnage, formant ladite âme, avec un point de jonction 19.In Figure 1, there is shown a strop 10 with, externally, strands on a core 12, symbolized in broken lines in this figure, with a point of penetration 14 of the free end portions 16 and 18 of the stranding cord 20 , forming said core, with a junction point 19.

Sur la figure 2, la section droite d'une estrope de l'art antérieur fait apparaître cinq torons, a, b, c, d, e du cordage 20, disposés sur l'âme 12. On remarque la section ovale des torons tandis que la section de la portion libre d'extrémité 16 ou 18 du cordage ayant servi à la réalisation des torons, en position centrale, formant l'âme, est parfaitement ronde.In Figure 2, the cross section of a strop of the prior art shows five strands, a , b , c , d , e of the rope 20, arranged on the core 12. We note the oval section of the strands while that the section of the free end portion 16 or 18 of the rope used to produce the strands, in the central position, forming the core, is perfectly round.

Il n'est pas possible de disposer six torons de façon hélicoïdale car seuls six cercles d'un diamètre D peuvent être disposés avec un point de tangence en périphérie d'un cercle central de même diamètre D.It is not possible to have six strands helically because only six circles of diameter D can be arranged with a point of tangency at the periphery of a central circle of the same diameter D.

De plus sur ce cordage à cinq torons, le grand axe de l'ellipse est assez grand pour que les torons enroulés viennent au contact les uns des autres en se bloquant, ce qui oblige à un pas de toronnage court et un angle d'enroulement hélicoïdal important. On sait que cela diminue la résistance totale de l'estrope dans des proportions très significatives.In addition, on this five-strand rope, the long axis of the ellipse is large enough for the coiled strands to come into contact with each other by locking, which requires a short stranding pitch and a winding angle. important helical. We know that this decreases the total resistance of the strop in very significant proportions.

Le procédé selon l'invention permet de réaliser une estrope dont la section droite est montrée sur la figure 3.The method according to the invention makes it possible to produce a strop whose cross section is shown in FIG. 3.

Cette estrope comprend six torons I, II, III, IV, V et VI d'un diamètre D2 autour d'une âme 12 d'un diamètre D1. Chaque toron est une ellipse dont le petit axe d1, égal à D2, est d'une dimension inférieure à celle du grand axe d2.This strop comprises six strands I , II , III , IV , V and VI of a diameter D2 around a core 12 of a diameter D1 . Each strand is an ellipse whose minor axis d1, equal to D2 , is of a dimension smaller than that of the major axis d2 .

Le grand axe d2 est très faiblement inférieur ou égal à D1, puisque seuls six cercles peuvent être logés avec un point de tangence à la périphérie d'un cercle de même diamètre. Le diamètre D2 doit être inférieur à D1.The major axis d2 is very slightly less than or equal to D1 , since only six circles can be accommodated with a point of tangency at the periphery of a circle of the same diameter. The diameter D2 must be less than D1 .

Pour arriver à un tel résultat, le procédé de mise en oeuvre est décrit ci-après en se référant aux figures 4A à 4C.To achieve such a result, the implementation method is described below with reference to FIGS. 4A to 4C.

Il convient de prendre un cordage avec lequel doit être réalisée l'estrope, le diamètre et la texture étant choisis tout d'abord pour répondre au cahier des charges prescrit et à la rupture ou à la charge maximale d'utilisation.It is advisable to take a cord with which the strop must be carried out, the diameter and the texture being chosen first of all to meet the prescribed specifications and at break or at the maximum load of use.

Préalablement à la réalisation de l'estrope elle-même, il est prévu un traitement particulier du cordage, figure 4A, pour réduire sur une zone donnée le diamètre de ce cordage.Prior to the realization of the strop itself, a special treatment of the rope is provided, FIG. 4A, in order to reduce the diameter of this rope in a given area.

Le cordage est choisi parmi les cordages en un matériau qui leur permet d'avoir une certaine capacité à se contracter et donc à se restreindre en diamètre lorsqu'ils sont étirés et qui conserve ce diamètre réduit même après que la traction a cessé.The rope is chosen from among the ropes made of a material which allows them to have a certain capacity to contract and therefore to restrict their diameter when they are stretched and which retains this reduced diameter even after traction has ceased.

On connaît par exemple les cordages commercialisés sous la marque DYNÉMA, qui présentent cette caractéristique.We know for example the ropes sold under the brand DYNÉMA, which have this characteristic.

Aussi, le procédé consiste à préparer une longueur de cordage nécessaire pour la réalisation de l'estrope, soit environ 7,5 fois le périmètre C moyen de cette estrope. Il faut tenir compte de l'allongement que va subir ce cordage lors de la mise en oeuvre du procédé comme cela sera expliqué ultérieurement.Also, the method consists in preparing a length of rope necessary for the realization of the strop, that is to say approximately 7.5 times the average perimeter C of this strop. Account must be taken of the elongation that this rope will undergo during the implementation of the method as will be explained later.

Ce cordage a un diamètre nominal nominal.This rope has a nominal nominal diameter.

Le cordage est ensuite immobilisé dans des moyens de serrage 20, symbolisés sur cette figure 4A, en des points précis situés, dans le cas d'une âme symétrique d'une longueur C, à un minimum d'1/2 C de l'extrémité libre.The rope is then immobilized in clamping means 20, symbolized in this FIG. 4A, at precise points located, in the case of a symmetrical core of a length C , at a minimum of 1/2 C of the free end.

Une traction est ensuite exercée entre ces deux moyens de serrage pour assurer l'étirage du cordage, dans la seule partie médiane, comprise entre les moyens de serrage, le diamètre du cordage passant de D1 à D2, avec D2< D1.A traction is then exerted between these two tightening means to ensure the stretching of the cord, in the only middle part, comprised between the tightening means, the diameter of the cord passing from D1 to D2 , with D2 < D1 .

Le diamètre D2 est déterminé par les différents paramètres que sont :

  • le pas de toronnage,
  • le diamètre D1 qui donne la valeur maximale du grand axe d2 de l'ellipse, et
  • la détermination du petit axe d1 de l'ellipse qui donne la valeur maximale de D2.
The diameter D2 is determined by the different parameters that are:
  • no stranding,
  • the diameter D1 which gives the maximum value of the major axis d2 of the ellipse, and
  • the determination of the minor axis d1 of the ellipse which gives the maximum value of D2.

Les deux portions d'extrémité, en dehors des moyens de serrage conservent le diamètre D1 initial.The two end portions, apart from the clamping means, retain the initial diameter D1 .

Après relâchement de l'effort de traction, le cordage conserve ce diamètre D2, dans sa partie médiane.After loosening the tensile force, the rope retains this diameter D2 , in its middle part.

Sur la figure 4B, on toronne la partie médiane du cordage de l'estrope au diamètre D2, sur un moule 22 qui est par exemple un fil d'acier, au diamètre D1.In FIG. 4B, the middle part of the strop of the strop at diameter D2 is stranded on a mold 22 which is for example a steel wire, at diameter D1 .

On réalise successivement six passages pour former un grelin à six torons.Six passages are made successively to form a six-strand grelin.

On retire ensuite le moule à travers les torons au droit du point d'introduction 14 et, simultanément, on fait pénétrer les portions d'extrémité du cordage, au diamètre D1, dans le volume libre laissé par le retrait progressif du moule, ceci avec les méthodes connues de l'homme de l'art.The mold is then withdrawn through the strands to the right of the point of introduction 14 and, simultaneously, the end portions of the rope, of diameter D1 , are made to enter the free volume left by the progressive withdrawal of the mold, this with methods known to those skilled in the art.

On obtient ainsi l'estrope dont la coupe est montrée sur la figure 3.The strop is thus obtained, the section of which is shown in FIG. 3.

Ce procédé est particulièrement facile à mettre en oeuvre, il requiert des moyens de traction pour l'étirage du cordage, qui sont présents dans les entreprises du domaine technique considéré et la réalisation proprement dite de l'estrope par toronnage et introduction des portions d'extrémité en lieu et place du moule, est de type connu.This process is particularly easy to implement, it requires traction means for stretching the rope, which are present in companies in the technical field considered and the actual production. of the strop by stranding and introduction of the end portions in place of the mold, is of known type.

Selon une variante de réalisation de l'invention, il est aussi possible de conserver le cordage au diamètre nominal D1 dans la partie médiane et de grossir les portions d'extrémité à un diamètre D'2 sur une longueur correspondant sensiblement à un minimum d'1/2 périmètre C. Cette augmentation de diamètre passe, par exemple par un toronnage simple d'un cordage de diamètre adéquat autour de ces portions d'extrémité.According to an alternative embodiment of the invention, it is also possible to keep the rope at the nominal diameter D1 in the middle part and to enlarge the end portions to a diameter D'2 over a length corresponding substantially to a minimum of 1/2 perimeter C. This increase in diameter passes, for example by a simple stranding of a cord of adequate diameter around these end portions.

Ceci permet également de loger six torons de diamètre D1 à la périphérie de l'âme de diamètre D'2, tout en conservant un cordage unique, monolithique.This also makes it possible to accommodate six strands of diameter D1 at the periphery of the core of diameter D'2, while retaining a single, monolithic rope.

Cette variante est tout à fait réalisable mais industriellement on lui préfère le mode principal de mise en oeuvre du procédé car il paraît être le moins cher et de plus il n'y a aucun élément rapporté de façon artificielle pour augmenter le diamètre.This variant is entirely feasible but industrially it is preferred the main mode of implementation of the method because it appears to be the cheapest and moreover there is no element artificially added to increase the diameter.

Néanmoins, on remarque la possibilité offerte par cette variante de fabriquer des estropes avec des cordages n'ayant pas de capacité à conserver le diamètre réduit par traction.However, we note the possibility offered by this variant to manufacture strops with ropes having no ability to keep the reduced diameter by traction.

Certains cordages ont des capacités à conserver un diamètre réduit mais avec un certain relâchement si bien que, lors de la fabrication, il faut tenir compte de ce relâchement.Some ropes have the capacity to keep a reduced diameter but with a certain looseness so that, during manufacture, it is necessary to take this loosening into account.

Dans tous les cas, il convient impérativement de ne pas dégrader les caractéristiques mécaniques du cordage par des efforts de traction trop importants durant l'étirage et on a remarqué, dans le cas du DYNÉMA, qu'une traction au 1/5 de la résistance à la rupture était un bon compromis.In all cases, it is imperative not to degrade the mechanical characteristics of the rope by excessive tensile forces during stretching and we have noticed, in the case of DYNEMA, that a traction at 1/5 of the resistance at break was a good compromise.

Claims (4)

Procédé de fabrication d'une estrope de périmètre C à partir d'un seul et même cordage de diamètre D1, comprenant une âme sur laquelle sont positionnés des torons, les extrémités dudit cordage constituant cette âme avec un point de pénétration de ces extrémités, caractérisé en ce qu'il comprend les étapes suivantes : - découpe d'une longueur de cordage L nécessaire pour la fabrication de l'estrope de périmètre C, - détermination d'une partie médiane du cordage pour former l'âme centrale et de deux portions d'extrémité, sensiblement égale à ½ C, réservées de part et d'autre de la partie médiane, - modification des diamètres relatifs de la partie médiane et des portions d'extrémité, pour conférer un diamètre D1 aux portions d'extrémités et un diamètre D2 à la partie médiane, - toronnage six fois d'un même cordage autour d'un moule de diamètre D1, à partir d'un point dit de pénétration de l'estrope, afin de former un grelin, - retrait du moule par le point de pénétration, et - introduction des portions d'extrémité en lieu et place du moule pour former l'âme de l'estrope. Method of manufacturing a strop of perimeter C from a single rope of diameter D1 , comprising a core on which strands are positioned, the ends of said rope constituting this core with a point of penetration of these ends, characterized in that it includes the following steps: - cutting a length of rope L necessary for the manufacture of the strop of perimeter C, - determination of a middle part of the rope to form the central core and of two end portions, substantially equal to ½ C, reserved on either side of the middle part, - modification of the relative diameters of the middle part and the end portions, to give a diameter D1 to the end portions and a diameter D2 to the middle part, - stranding six times of the same rope around a mold of diameter D1, from a point called penetration of the strop, in order to form a grelin, - withdrawal of the mold by the point of penetration, and - introduction of the end portions in place of the mold to form the core of the strop. Procédé selon la revendication 1, caractérisé en ce que pour réaliser la modification de diamètre : - on utilise un cordage de diamètre nominal ayant des capacités à conserver un diamètre restreint D2 lorsqu'il est étiré, - on étire la partie médiane pour lui conférer un diamètre D2<D1, le diamètre D1 des portions d'extrémité étant conservé, afin que les torons soient réalisés à partir d'un cordage de diamètre D2, autour d'une âme de diamètre D1. Method according to claim 1, characterized in that to carry out the modification of diameter: - a nominal diameter rope is used which has the capacity to keep a restricted diameter D2 when it is stretched, - the middle part is stretched to give it a diameter D2 <D1, the diameter D1 of the end portions being preserved, so that the strands are made from a rope of diameter D2, around a core of diameter D1 . Procédé selon la revendication 1, caractérisé en ce que pour réaliser la modification de diamètre : - on utilise un cordage de diamètre nominal D1, - on réalise une surépaisseur des portions d'extrémité pour leur conférer un diamètre D'2 telle que D'2>D1, afin que les torons soient réalisés à partir d'un cordage de diamètre D1, autour d'une âme de diamètre D'2. Method according to claim 1, characterized in that to carry out the modification of diameter: - a rope of nominal diameter D1 is used, - We make an extra thickness of the end portions to give them a diameter D'2 such as D'2> D1, so that the strands are made from a rope of diameter D1, around a core of diameter D '2. Estrope à six torons obtenue par le procédé selon l'une quelconque des revendications 1 à 3.Six strand strop obtained by the process according to any one of Claims 1 to 3.
EP19970450006 1996-04-19 1997-04-18 Method of manufacturing a cord grommet and grommet thus obtained Expired - Lifetime EP0802274B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9605185 1996-04-19
FR9605185A FR2747696B1 (en) 1996-04-19 1996-04-19 METHOD OF MANUFACTURING A STRAP A STRAP AND A STRAP OBTAINED THEREBY

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EP0802274A1 true EP0802274A1 (en) 1997-10-22
EP0802274B1 EP0802274B1 (en) 2001-09-05

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DE (1) DE69706465T2 (en)
FR (1) FR2747696B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20170954A1 (en) * 2017-06-13 2018-12-14 Van Beest Norway As A chain formed of linked flexible loops, and an apparatus and a method of manufacture of said loops
DE202018105723U1 (en) * 2018-10-05 2018-11-09 Westdeutscher Drahtseil-Verkauf Dolezych Gmbh & Co. Kg Chain, especially heavy load chain

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216922A (en) * 1939-05-19 1940-10-08 Macwhyte Company Method of making grommets
DE948040C (en) * 1951-07-10 1956-08-23 Hans Baur Jun Process and device for the production of endless ropes with a core
DE2755605A1 (en) * 1977-12-14 1979-06-21 Guenter Dipl Ing Scheffler Endless rope - which is twisted from single cord producing five outer strands and a core which in region of splicing of free end is reduced in dia.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2216922A (en) * 1939-05-19 1940-10-08 Macwhyte Company Method of making grommets
DE948040C (en) * 1951-07-10 1956-08-23 Hans Baur Jun Process and device for the production of endless ropes with a core
DE2755605A1 (en) * 1977-12-14 1979-06-21 Guenter Dipl Ing Scheffler Endless rope - which is twisted from single cord producing five outer strands and a core which in region of splicing of free end is reduced in dia.

Also Published As

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FR2747696A1 (en) 1997-10-24
EP0802274B1 (en) 2001-09-05
DE69706465T2 (en) 2003-01-16
DE69706465D1 (en) 2001-10-11
FR2747696B1 (en) 1998-07-17

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