EP1090659B1 - Method and device for maintenance within storage containers - Google Patents

Method and device for maintenance within storage containers Download PDF

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Publication number
EP1090659B1
EP1090659B1 EP00121573A EP00121573A EP1090659B1 EP 1090659 B1 EP1090659 B1 EP 1090659B1 EP 00121573 A EP00121573 A EP 00121573A EP 00121573 A EP00121573 A EP 00121573A EP 1090659 B1 EP1090659 B1 EP 1090659B1
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EP
European Patent Office
Prior art keywords
tank
hand rail
air
person
operators
Prior art date
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Expired - Lifetime
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EP00121573A
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German (de)
French (fr)
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EP1090659A1 (en
Inventor
M. Jean-Marc Delrieux
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Heaven Climber Travaux Speciaux SA
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Heaven Climber Travaux Speciaux SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/0093—Devices for cleaning the internal surfaces of the container and forming part of the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks

Definitions

  • the present invention relates to a maintenance method of material accumulators as well as an installation suitable for implement the process.
  • accumulators of materials we mean any type of building and reserve such as silos capable of containing materials to be stored and particularly materials powder.
  • One of them may receive a large amount of material and is seriously injured.
  • the object of the invention is to remedy the drawbacks of devices and methods currently in use.
  • Figure 1 is a schematic view of an accumulator in which human intervention is carried out.
  • the installation according to the invention firstly comprises at minus a handrail fixed on the walls 2 of the accumulator 1, in its upper part, so as to ensure 3 people from the top.
  • people intervention 3 can travel the periphery of accumulator 1 while progressing towards the bottom thereof.
  • the sectors of evolution of people 3 are offset around the periphery of the walls 2 by fractionation of the handrail.
  • the installation according to the invention also comprises ropes 4 as shown in Figure 1 to ensure each person 3.
  • the ropes connect, in the mode of illustrated realization, the intervention persons 3 to one winch located or attached to the top of the accumulator 1.
  • intervention persons 3 are insured from the top of the silo avoids any risk of entanglement of rope especially in people's feet.
  • the installation presents 5 pipes for feeding people intervention 3 in oxygen.
  • Breathing air is supplied through pipes 5 from one or more compressors 7a in particular electric capable of supplying outside air up to the intervention people.
  • compressors 7b may also allow material supply.
  • the reel 6 is used for the unwinding of 5 supply hoses.
  • an air reserve is provided at outside. It provides security in the sense that it provides a minimum breathable volume allowing, in the event of a problem, to evacuate people 3 without running out of oxygen.
  • the air present inside the accumulators 1 are often not very breathable, an air supply exterior will preferably be achieved through pipes 5.
  • This work can be done by means of drain.
  • the powdery materials thus released can be recovered from the bottom of the accumulator through everything current means and in particular vehicles or machines 8.
  • a safety reserve ensures the air supply until the evacuation of people.

Abstract

A handrail is placed around the top of the silo perimeter. The lowering of each person into the silo (1) is assured by two anchoring points located on the handrail. The silo internal perimeter is divided into as many sectors as there are persons so as to define a vertical displacement space for each person. Oxygen is supplied to each person through supply pipes (5). An Independent claim is also included for the apparatus for maintaining silo.

Description

La présente invention concerne un procédé d'entretien d'accumulateurs de matières ainsi qu'une installation apte à mettre en oeuvre le procédé.The present invention relates to a maintenance method of material accumulators as well as an installation suitable for implement the process.

On entend par accumulateurs de matières tout type de bâtiment et de réserve tels que des silos aptes à contenir des matières à stocker et particulièrement des matières pulvérulentes.By accumulators of materials we mean any type of building and reserve such as silos capable of containing materials to be stored and particularly materials powder.

Ce type de silos, en effet, ont souvent des dimensions très importantes ce qui nécessite des moyens d'intervention dans leur volume intérieur très particuliers.This type of silos, in fact, often have dimensions very important which requires means of intervention in their very particular interior volume.

Par ailleurs, le stockage de matières pulvérulentes engendre des problèmes spécifiques et notamment la présence résiduelle lors du vidage du silo, de matière tapissant les parois.In addition, the storage of powdery materials generates specific problems and in particular the presence residual during the emptying of the silo, of material lining the walls.

Dans ce cadre, il est nécessaire de faire appel à une intervention humaine pour obtenir une vidange complète du silo.In this context, it is necessary to call upon a human intervention to obtain a complete emptying of the silo.

A l'heure actuelle, les interventions humaines dans les silos s'effectuent par des personnes attachées depuis le haut du silo et comportant des masques.At present, human interventions in the silos are made by people tied from the top silo and with masks.

Le travail effectué est ensuite purement manuel et souvent réalisé par plusieurs personnes à la fois pour des raisons d'efficacité.The work done is then purely manual and often carried out by several people at the same time for reasons efficiency.

Ce type d'intervention présente différents inconvénients qui peuvent être graves sur le plan de la sécurité des individus.This type of intervention has various disadvantages which can be serious from a safety point of view people.

En premier lieu, des chutes non contrôlées de matières pulvérulentes sont quelques fois occasionnées par le travail des personnes d'intervention.First, uncontrolled material scraps are sometimes caused by work intervention people.

Il se peut que l'une d'entre elles reçoive une grande quantité de matière et s'en trouve gravement blessée.One of them may receive a large amount of material and is seriously injured.

Par ailleurs, les interventions actuelles s'effectuent de manière peu pratique notamment parce qu'aucun dispositif n'est prévu pour faciliter le déplacement des personnels intervenant.In addition, current interventions are carried out impractical especially because no device is designed to facilitate the movement of personnel speaker.

De plus, de nombreux malaises sont constatés essentiellement par l'absorption de poussière et le caractère peu respirable de l'air présent dans les silos.In addition, many discomforts are noted essentially by dust absorption and character poorly breathable air present in silos.

L'invention a pour objet de remédier aux inconvénients des dispositifs et des procédés actuellement utilisés.The object of the invention is to remedy the drawbacks of devices and methods currently in use.

Elle présente pour ce faire un procédé et une installation particulièrement avantageux combinant une disposition particulière de mains courantes sur les parois des accumulateurs avec un déplacement calculé des personnes intervenant, toujours dans un secteur bien délimité dans l'accumulateur. To do this, it presents a method and an installation particularly advantageous combining a layout particular of handrails on the walls of accumulators with calculated displacement of people intervening, always in a well-defined sector in the accumulator.

De cette façon, les personnes peuvent travailler en parallèle à la même hauteur tout en se situant toujours au-dessus du produit.In this way, people can work in parallel to the same height while still lying above of the product.

On évite tout risque de chute du produit sur l'une d'entre elles.We avoid any risk of the product falling on one of they.

Par ailleurs, selon le procédé de l'invention, un nettoyage complet est effectué de par le caractère très méthodique de l'intervention.Furthermore, according to the method of the invention, a thorough cleaning is carried out due to the very methodical intervention.

D'autres buts et avantages apparaítront au cours de la description qui suit qui n'est cependant donnée qu'à titre indicative.Other goals and advantages will emerge during the description which follows which is however given only as Tentative.

La présente invention concerne un procédé d'entretien d'accumulateurs de matières tels des silos pour matières pulvérulentes dans lesquels s'introduisent une ou plusieurs personnes d'intervention, caractérisé par le fait que :

  • On met en place au moins une main courante sur tout le pourtour intérieur de l'accumulateur (1) par fixation sur les parois (2) dans leurs parties hautes;
  • On assure chaque personne (3) dans son mouvement vers la base de l'accumulateur (1), depuis le haut de l'accumulateur (1), par au moins deux points d'ancrage situés en haut de l'accumulateur (1) et dont l'un au moins est réalisé sur la main courante;
  • On divise le pourtour intérieur de l'accumulateur (1) en autant de secteurs qu'il y a de personnes (3) de façon à définir un espace vertical de déplacement distinct pour chaque personne (3),
afin de permettre un travail en parallèle de plusieurs personnes d'intervention dans des conditions favorables de sécurité.The present invention relates to a method for servicing material accumulators such as silos for pulverulent materials into which one or more intervention persons are introduced, characterized in that:
  • At least one handrail is placed over the entire inner periphery of the accumulator (1) by fixing to the walls (2) in their upper parts;
  • Each person (3) is ensured in his movement towards the base of the accumulator (1), from the top of the accumulator (1), by at least two anchoring points located at the top of the accumulator (1) and at least one of which is made on the handrail;
  • The inner circumference of the accumulator (1) is divided into as many sectors as there are people (3) so as to define a separate vertical displacement space for each person (3),
in order to allow several intervention persons to work in parallel in favorable security conditions.

Elle concerne également une installation apte à mettre en oeuvre le procédé selon l'invention.It also relates to an installation suitable for implements the method according to the invention.

Selon l'invention, l'installation pour l'entretien d'accumulateurs de matières tels de silos pour matières pulvérulentes dans lesquels s'introduisent une ou plusieurs personnes d'intervention, apte à mettre en oeuvre le procédé, comprend :

  • Au moins une main courante sur tout le pourtour intérieur de l'accumulateur par fixation sur les parois en partie haute ;
  • Des cordages pour assurer chaque personne dans son mouvement vers la base de l'accumulateur depuis le haut de l'accumulateur.
  • Au moins deux ancrages pour les cordages situés en partie haute de l'accumulateur et dont l'un au moins est réalisé sur la main courante,
afin de permettre un travail en parallèle de plusieurs personnes d'intervention dans des conditions favorables de sécurité.According to the invention, the installation for the maintenance of accumulators of materials such as silos for pulverulent materials into which one or more intervention persons are introduced, capable of implementing the method, comprises:
  • At least one handrail around the entire inner periphery of the accumulator by fixing to the walls in the upper part;
  • Ropes to ensure each person in his movement towards the base of the accumulator from the top of the accumulator.
  • At least two anchors for the ropes located in the upper part of the accumulator and at least one of which is made on the handrail,
in order to allow several intervention persons to work in parallel in favorable security conditions.

Le procédé d'intervention humaine pourra se présenter suivant les modes de réalisation énoncés ci-après.

  • on réalise les deux points d'ancrage sur la main courante.
  • le deuxième point d'ancrage est réalisé par le biais d'un treuil depuis le sommet de l'accumulateur.
  • on apporte de l'oxygène aux personnes d'intervention depuis l'extérieur de l'accumulateur, par le biais de tuyaux d'alimentation.
  • on déroule les tuyaux d'alimentation de façon synchrone à l'évolution verticale des personnes vers la base de l'accumulateur.
  • on crée une réserve d'air de sécurité à l'extérieur de l'accumulateur.
  • on déclenche une alarme lorsque le volume d'air présent dans la réserve d'air est inférieur à un volume prédéterminé correspondant à la consommation en air de toutes les personnes pendant une durée prédéterminée.
The human intervention process may be presented according to the embodiments set out below.
  • the two anchor points are made on the handrail.
  • the second anchor point is made by a winch from the top of the accumulator.
  • oxygen is brought to the intervention personnel from outside the accumulator, via supply pipes.
  • the supply pipes are unwound synchronously with the vertical movement of people towards the base of the accumulator.
  • a reserve of safety air is created outside the accumulator.
  • an alarm is triggered when the air volume present in the air reserve is less than a predetermined volume corresponding to the air consumption of all people for a predetermined duration.

L'installation pourra se présenter sous les modes de réalisation suivants :

  • les deux ancrages sont réalisés sur la main courante.
  • elle comporte au moins un treuil par le biais duquel est réalisé le deuxième point d'ancrage, ledit treuil étant assuré depuis le sommet de l'accumulateur.
  • elle présente des tuyaux d'alimentation en oxygène. Elle présente un dévidoir pour le déroulement des tuyaux d'alimentation de façon synchrone de l'évolution des personnes, ledit dévidoir étant placé au sommet de l'accumulateur.
  • elle comporte une réserve d'air de sécurité à l'extérieur de l'accumulateur.
The installation can be presented in the following embodiments:
  • the two anchors are made on the handrail.
  • it comprises at least one winch through which the second anchoring point is made, said winch being provided from the top of the accumulator.
  • it has oxygen supply pipes. It has a reel for the unwinding of the supply pipes synchronously with the evolution of people, said reel being placed at the top of the accumulator.
  • it includes a reserve of safety air outside the accumulator.

Les dessins ci-joints sont donnés à titre d'exemples indicatifs et non limitatifs. Ils représentent un mode de réalisation préféré selon l'invention. Ils permettront de comprendre aisément l'invention.The attached drawings are given as examples indicative and not limiting. They represent a mode of preferred embodiment according to the invention. They will allow easily understand the invention.

La figure 1 est une vue schématique d'un accumulateur dans lequel une intervention humaine est réalisée.Figure 1 is a schematic view of an accumulator in which human intervention is carried out.

L'installation selon l'invention comprend tout d'abord au moins une main courante fixée sur les parois 2 de l'accumulateur 1, en sa partie supérieure, de façon à assurer les personnes 3 depuis le haut.The installation according to the invention firstly comprises at minus a handrail fixed on the walls 2 of the accumulator 1, in its upper part, so as to ensure 3 people from the top.

En suivant les mains courantes, les personnes d'intervention 3 peuvent parcourir la périphérie de l'accumulateur 1 tout en progressant vers le bas de celui-ci.By following the handrails, people intervention 3 can travel the periphery of accumulator 1 while progressing towards the bottom thereof.

Selon l'invention, les secteurs d'évolution des personnes 3 sont décalés sur le pourtour des parois 2 par fractionnement de la main courante.According to the invention, the sectors of evolution of people 3 are offset around the periphery of the walls 2 by fractionation of the handrail.

De cette façon, un travail en parallèle à la même hauteur de plusieurs personnes d'intervention 3 est possible.In this way, working in parallel at the same height of several intervention persons 3 is possible.

On évite ainsi tout risque de chute de matières sur l'une ou l'autre des personnes d'intervention.This avoids any risk of falling materials on one either of the intervention people.

De plus, la mise en place de mains courantes et la répartition des personnes 3 assurent une progression régulière de chaque personne pour couvrir et intervenir sur toute la surface des parois 2.In addition, the installation of handrails and the distribution of people 3 ensure a steady progression of each person to cover and intervene on the whole wall surface 2.

L'installation selon l'invention comprend également des cordages 4 tels que représentés en figure 1 pour assurer chaque personne 3. Les cordages relient, dans le mode de réalisation illustré, les personnes d'intervention 3 à un treuil localisé ou fixé sur le haut de l'accumulateur 1.The installation according to the invention also comprises ropes 4 as shown in Figure 1 to ensure each person 3. The ropes connect, in the mode of illustrated realization, the intervention persons 3 to one winch located or attached to the top of the accumulator 1.

Le fait que les personnes d'intervention 3 soient assurées depuis le haut du silo évite tout risque d'enchevêtrement de cordage notamment dans les pieds des personnes.The fact that intervention persons 3 are insured from the top of the silo avoids any risk of entanglement of rope especially in people's feet.

De plus, elles sont associées par deux points d'ancrages au minimum, dont l'un est réalisé sur la main courante.In addition, they are associated by two anchor points at least, one of which is made on the handrail.

Dans un mode préféré de réalisation, l'installation présente des tuyaux 5 pour l'alimentation des personnes d'intervention 3 en oxygène.In a preferred embodiment, the installation presents 5 pipes for feeding people intervention 3 in oxygen.

Ces tuyaux sont également représentés en figure 1.These pipes are also shown in Figure 1.

L'alimentation en air respirable s'effectue par le biais des tuyaux 5 depuis un ou plusieurs compresseurs 7a notamment électriques aptes à faire parvenir de l'air extérieur jusqu'aux personnes d'intervention.Breathing air is supplied through pipes 5 from one or more compressors 7a in particular electric capable of supplying outside air up to the intervention people.

D'autres compresseurs 7b peuvent par ailleurs permettre l'alimentation du matériel.Other compressors 7b may also allow material supply.

A l'heure actuelle, une telle alimentation en air respirable n'est pas réalisée, ce qui est préjudiciable à la santé des personnes d'intervention 3.At present, such an air supply breathable is not performed, which is detrimental to health of responders 3.

Par ailleurs, pour éviter tout enchevêtrement de câble ou de tuyaux, le dévidoir 6 est utilisé pour le déroulement des tuyaux 5 d'alimentation.Furthermore, to avoid any entanglement of cable or of pipes, the reel 6 is used for the unwinding of 5 supply hoses.

Le déroulement des tuyaux 5 est synchrone à l'évolution des personnes 3 ce qui évite tout déplacement de tuyaux ou de câbles en dessous des personnes d'intervention.The course of the pipes 5 is synchronous to the evolution people 3 which prevents any displacement of pipes or cables below the intervention persons.

Préférentiellement, une réserve d'air est prévue à l'extérieur. Elle offre une sécurité en ce sens qu'elle assure un volume respirable minimum permettant, en cas de problème, d'évacuer les personnes 3 sans qu'elles manquent d'oxygène. Preferably, an air reserve is provided at outside. It provides security in the sense that it provides a minimum breathable volume allowing, in the event of a problem, to evacuate people 3 without running out of oxygen.

Le procédé d'entretien ici présenté est réalisé de façon très efficace.The maintenance process presented here is carried out so very effective.

Dans un premier temps, on met en place les mains courantes sur les parois 2 de l'accumulateur 1. Cette mise en place pourra être effectuée de façon courante par le biais de pitons.First, we put the handrails in place on the walls 2 of the accumulator 1. This installation can be performed routinely through pitons.

Il y aura autant de mains courantes que de personnes d'intervention 3.There will be as many handrails as there are people intervention 3.

Dans un mode préféré, deux personnes interviennent dans l'accumulateur 1 et on utilisera deux mains courantes décalées à 180 °.In a preferred mode, two people intervene in accumulator 1 and we will use two offset handrails 180 °.

Durant tout leur déplacement au sein des accumulateurs 1, les personnes 3 sont assurées depuis le haut de l'accumulateur 1.During their entire movement within the accumulators 1, 3 people are insured from the top of the accumulator 1.

Par ailleurs, l'air présent à l'intérieur des accumulateurs 1 étant souvent peu respirable, un apport d'air extérieur sera réalisé préférentiellement par le biais de tuyaux 5.In addition, the air present inside the accumulators 1 are often not very breathable, an air supply exterior will preferably be achieved through pipes 5.

Dans le cadre de la vidange d'un silo, les personnes d'intervention 3 vont essentiellement éliminer le résidu de matières pulvérulentes accroché aux parois 2.When emptying a silo, people intervention 3 will essentially remove the residue from pulverulent materials attached to the walls 2.

Ce travail peut être effectué par le biais de barres de vidange.This work can be done by means of drain.

Les matières pulvérulentes ainsi dégagées peuvent être récupérées dans le bas de l'accumulateur par le biais de tout moyen courant et notamment des véhicules ou engins d'évacuation 8.The powdery materials thus released can be recovered from the bottom of the accumulator through everything current means and in particular vehicles or machines 8.

En cas de problème, une réserve de sécurité assure l'alimentation en air jusqu'à l'évacuation des personnes.In the event of a problem, a safety reserve ensures the air supply until the evacuation of people.

Une alarme peut être alors déclenchée quand le volume d'air dans la réserve passe sous un seuil critique correspondant au volume nécessaire à l'alimentation des personnes pendant une durée fixée. Le treuil 9 qui permet d'assurer les personnes par un point d'ancrage pourra par ailleurs suivre l'évolution des personnes 3 vers la base de l'accumulateur 1. De cette façon, les personnes disposeront d'un recours immédiat pour l'évacuation en urgence. An alarm can then be triggered when the volume of air in the reserve falls below a critical threshold corresponding to the volume required to supply the people for a fixed period. Winch 9 which allows to insure people by an anchor point may by elsewhere follow the evolution of people 3 towards the base of accumulator 1. In this way, people will have immediate recourse for emergency evacuation.

REFERENCESREFERENCES

  • 1. Accumulateur1. Accumulator
  • 2. Parois2. Walls
  • 3. Personne d'intervention3. Intervention person
  • 4. Cordages4. Ropes
  • 5. Tuyaux5. Pipes
  • 6. Dévidoir6. Hose reel
  • 7. Compresseur (7a : compresseur personnel - 7b : compresseur matériel)7. Compressor (7a: personal compressor - 7b: compressor equipment)
  • 8. Engin d'évacuation8. Evacuation device
  • 9. Treuil9. Winch

    • Claims (13)

    1. System for maintenance work on storage tanks (1) such as hoppers for powdered substances that several maintenance operators (3) may enter, characterized in that
      At least one hand rail is installed around all the inside of the tank (1) by fixation on the walls (2) in their upper parts;
      Each person (3) is secured in its movement from the top towards the bottom of the tank (1) by at least two anchor points situated at the top of the tank (1), one of which at least is executed on the hand rail;
      The inside of the tank (1) is divided into as many sectors as there are persons (3) in order
      to define a separate vertical space for each person
      so that several operators can work at the same time in conditions of safety.
    2. System according to claim 1, characterized in that
         the two anchor points are both executed on the hand rail.
    3. System according to claim 1, characterized in that
         the second anchor point takes the form of a winch lowered from the top of the tank (1).
    4. System according to any one of claims 1 to 3, characterized in that
         oxygen is supplied to the operators (3) from outside the tank (1), through supply pipes (5).
    5. System according to claim 4, characterized in that
         the supply pipes (5) is unwound to match the vertical movement of the persons (3) towards the bottom of the tank (1).
    6. System according to any one of the claims 4 or 5, characterized in that
         a standby air tank is created outside the tank (1).
    7. System according to claim 6, characterized in that
         an alarm is tripped when the volume of air present in the air tank is less than a predetermined volume corresponding to the air consumption of all the maintenance operators (3) during a predetermined period.
    8. Installation for maintaining storage tanks (1) of material such as silos for powdered substances into which one or several maintenance operators (3) enter, capable of setting up the system according to any one of the claims 1 to 7, characterized in that it includes:
      At least one hand rail around all the inside of the tank (1) fixed on the walls (2) in the upper part;
      Lines (4) for securing each person (3) in his/her movements towards the bottom of the storage tank (1) from the top;
      At least two anchors for the lines (4) situated in the upper part of the tank (1), one of which at least is executed on the hand rail,
      in order to allow several persons to work in parallel in conditions of safety.
    9. Installation according to claim 8, characterized in that
         the two anchors are executed on the hand rail.
    10. Installation according to claim 8, characterized in that
         it includes at least one winch (9) by which the second anchor point is created, the said winch being secured from the top of the tank (1).
    11. Installation according to any one of the claims 8 to 10, characterized in that
         it has oxygen supply pipes (5).
    12. Installation according to claim 11, characterized in that
         it has a reel (6) for unwinding the supply pipes (5) to match the movements of the maintenance operators (3), the said reel (6) being placed at the top of the tank (1).
    13. Installation according to claim 11, characterized in that
         it includes a standby air tank positioned outside the storage tank (1).
    EP00121573A 1999-10-04 2000-10-02 Method and device for maintenance within storage containers Expired - Lifetime EP1090659B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9912340 1999-10-04
    FR9912340A FR2799130B1 (en) 1999-10-04 1999-10-04 METHOD AND DEVICE FOR MAINTENANCE WITHIN MATERIAL ACCUMULATOR

    Publications (2)

    Publication Number Publication Date
    EP1090659A1 EP1090659A1 (en) 2001-04-11
    EP1090659B1 true EP1090659B1 (en) 2002-12-04

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    EP (1) EP1090659B1 (en)
    AT (1) ATE228872T1 (en)
    DE (1) DE60000907T2 (en)
    ES (1) ES2188468T3 (en)
    FR (1) FR2799130B1 (en)

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    DE102018125075B4 (en) * 2018-10-10 2020-12-17 Indutec Umwelttechnik Gmbh & Co. Kg Method and system for cleaning the interior of an industrial boiler

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    US3556252A (en) * 1968-09-17 1971-01-19 Milo E Atkins Boom rigging
    FR2521541A1 (en) * 1982-02-17 1983-08-19 Huchez & Cie Personnel hoist safety mechanism e.g. silo - uses automatic brake actuated by lack of motor current and by cable tension, and has security cable and manual winding facility
    US5526989A (en) * 1994-08-08 1996-06-18 Staples; Wesley A. Method of operation of positive guidance system for a tank-cleaning device

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    EP1090659A1 (en) 2001-04-11
    ES2188468T3 (en) 2003-07-01
    DE60000907D1 (en) 2003-01-16
    ATE228872T1 (en) 2002-12-15
    DE60000907T2 (en) 2003-08-14
    FR2799130B1 (en) 2001-11-30
    FR2799130A1 (en) 2001-04-06

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