EP0538501B1 - Accumulateur à cylindre avec dispositif pour déconnecter l'huile de charge, incorporé dans un circuit hydraulique - Google Patents

Accumulateur à cylindre avec dispositif pour déconnecter l'huile de charge, incorporé dans un circuit hydraulique Download PDF

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Publication number
EP0538501B1
EP0538501B1 EP91117885A EP91117885A EP0538501B1 EP 0538501 B1 EP0538501 B1 EP 0538501B1 EP 91117885 A EP91117885 A EP 91117885A EP 91117885 A EP91117885 A EP 91117885A EP 0538501 B1 EP0538501 B1 EP 0538501B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
switch
space
gas
rod
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 - Lifetime
Application number
EP91117885A
Other languages
German (de)
English (en)
Other versions
EP0538501A1 (fr
Inventor
Manfred Wege
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.)
Bolenz & Schafer Maschinenfabrik GmbH
Original Assignee
Bolenz & Schafer Maschinenfabrik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bolenz & Schafer Maschinenfabrik GmbH filed Critical Bolenz & Schafer Maschinenfabrik GmbH
Priority to ES91117885T priority Critical patent/ES2069170T3/es
Priority to AT91117885T priority patent/ATE116409T1/de
Priority to DE59104086T priority patent/DE59104086D1/de
Priority to EP91117885A priority patent/EP0538501B1/fr
Publication of EP0538501A1 publication Critical patent/EP0538501A1/fr
Application granted granted Critical
Publication of EP0538501B1 publication Critical patent/EP0538501B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61D—BODY DETAILS OR KINDS OF RAILWAY VEHICLES
    • B61D7/00—Hopper cars
    • B61D7/14—Adaptations of hopper elements to railways
    • B61D7/16—Closure elements for discharge openings
    • B61D7/24—Opening or closing means
    • B61D7/28—Opening or closing means hydraulic or pneumatic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/31—Accumulator separating means having rigid separating means, e.g. pistons
    • F15B2201/312—Sealings therefor, e.g. piston rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/411—Liquid ports having valve means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/413—Liquid ports having multiple liquid ports
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/415—Gas ports
    • F15B2201/4155—Gas ports having valve means

Definitions

  • the invention relates to a cylinder pressure accumulator with a flying piston dividing the cylinder space into an oil space and a gas space in a hydraulic system, in particular on non-self-propelled vehicles for bulk goods with a hydraulically operated unloading device, with a pipeline leading into the oil space of the pressure accumulator
  • Check valve for the charging oil flow and an outgoing pipeline with a check valve for the working oil flow are connected and the gas space is equipped with a gas filling valve.
  • Cylinder pressure accumulators with these generic features are known in connection with hydraulic systems for actuating the unloading device on vehicles for bulk goods by prior use. Such devices are in use on railway wagons for bulk goods.
  • a wheelset pump is non-positively connected to a carriage axle, through which hydraulic oil is pumped into a cylinder pressure accumulator when the carriage moves.
  • a pressure shut-off valve is actuated, which redirects the charging oil flow to an oil reservoir without pressure.
  • the discharge device can be actuated without supplying any other energy, e.g. the side walls of the wagon or bulk goods flaps provided therein can be opened.
  • the pressure accumulator is recharged by the wheelset pump after the pressure shut-off valve is closed.
  • the pressure shut-off valve is a valve that only switches via the pressure prevailing in the charge oil flow. It works with a switch-off tolerance of 10%. As a result, the filling level of the pressure accumulator can also fluctuate by 10%. In addition, fluctuations in the level in the pressure accumulator that are dependent on the ambient temperature must be taken into account. The level is lower at a high ambient temperature than at a low ambient temperature. Because of this on the one hand from the shutdown tolerance of the pressure shutoff valve and on the other hand from the
  • a central part of the cylinder cover protruding from the cylinder is pierced by an oil channel which crosses the cylinder axis and which can be closed by a switching valve which is arranged in the cylinder axis and is in contact with the tappet of the shift rod and opens when it is pushed, and the inlet side of which is closed by a pressure accumulator bridging bypass pipeline is connected to the pipeline leading into the oil space for the charging oil flow.
  • the object of the present application is based on the task of creating a leak-free gas seal for the pressure accumulator.
  • the cylinder pressure accumulator essentially consists of a cylinder 1 , which is sealed oil-tight or gas-tight at one end by a cylinder base 2 and at the other end by a cylinder cover 3 , and a flying piston that divides the cylinder space into an oil space 4 and a gas space 5 6 .
  • a connecting bore 7 for a in-leading pipe 8 with a non-return valve 9 for the charging oil flow and a connection bore 10 for a lead-out conduit 11 with a check valve 12 are provided in each case for the working-oil flow.
  • the cylinder cover 3 closing the gas space 5 is provided with a gas filler valve 13 .
  • To the gas chamber side cylinder cover 3 is an axially projecting into the gas space 5 shift rod 14 in a gastight manner in the axial direction against the action of a spring assembly 15 and movably supported by the piston 6, which carries a protruding from the gas seal plunger 16 at its cylinder cover side end.
  • a central part 3a of the cylinder cover 3 protruding from the cylinder 1 is pierced by an oil channel 17a , 17b which crosses the cylinder axis and which is arranged by a switching valve 18 which is arranged in the cylinder axis and is in contact with the tappet 16 of the switching rod 14 and opens when it is pushed is lockable.
  • the input part 17a of the oil channel is connected by a pipe 19 bridging the pressure accumulator to the pipe 8 leading into the oil space 4 for the charging oil flow.
  • the plunger 16 fastened to the end of the shift rod 14 on the cylinder cover side has a cylindrical cam 16a in continuation of the shift rod 14 .
  • a prestressed helical spring 20, which is supported on an annular shoulder 16b of the plunger 16 and acts against the closing body 18a of the switching valve 18 is arranged thereon.
  • the housing of the switching valve 18 is closed by a screw plug 22 which is screwed in oil-tight axially from the outside into the central part 3a of the cylinder cover 3 .
  • the shift rod 14 is surrounded by a spacer tube 23 which limits the path of the piston 6 to the gas side, which is welded at one end to a spacer tube base 23a which has a central opening and is fastened to the inside of the cylinder cover 3 by means of screws 23b .
  • the switching rod 14 projects beyond the piston-free edge of the spacer tube 23 by a partial distance of the opening path of the switching valve 18 .
  • the shift rod 14 carries at its piston end an abutment 27 which is held by a nut 28 screwed onto the end of the shift rod 14 and which holds the plate springs 26 under prestress.
  • the nut 28 protrudes over the edge of the spacer tube 23 and serves as a switching stop for the switching rod 14 for the piston 6 on its way to the gas space during the charging process.
  • the spacer tube 23 thus limits on the one hand the path of the piston 6 to the gas side and on the other hand the path of the switching rod 14 to the switching valve 18 .
  • the opposite path of the shift rod 14 is limited by a shoulder-like thickening 14a of the shift rod 14 with which it abuts the inside of the intermediate floor 25 .
  • a hollow cylindrical projection 29 is fastened coaxially to the inside of the cylinder cover 3 by means of screws 24 , which on a part of the shift rod 14 leaves a space free of their length.
  • the cavity of the extension 29 continues in a recess 30 of the same diameter in the cylinder cover 3 , which merges into a shoulder-like taper 31 in the interior of the cylinder cover 3 .
  • the gas seal between the shift rod 14 and the cylinder cover 3 which enables the shift rod 14 to move axially, consists of an axially elastic metal bellows 32 surrounding the shift rod 14 at a short distance. This is welded gas-tight at one end to the plunger 16 designed as a screw cap and screwed onto the end of the switching rod 14 and at its other end to the free edge of the hollow cylindrical projection 29 .
  • the input part 17a and the output part 17b of the oil channel 17a , 17b leading through the part 3a of the cylinder bottom 3 protruding from the cylinder 1 are offset in the direction of the cylinder axis in such a way that the input part 17a opens radially into the switching valve 18 behind the closing body 18a in the closing direction , while the output part 17b leads radially in the closing direction in front of the closing body 18a out of the taper 31 forming a section of the oil channel of the axial bore 30 of the cylinder cover 3 .
  • the operation of the cylinder pressure accumulator according to the invention is as follows:
  • the gas space 5 is filled with gas up to a predetermined pressure by the gas filler valve 13 .
  • the pressure of the charging oil flow is transferred through the bypass pipeline 19 into the input part 17a of the oil channel leading through the extension 3a of the cylinder cover 3 to the rear of the closing body 18a in the switching valve 18 .
  • the pressure of the charging oil flow together with the helical spring 21 located on the rear side of the closing body 18a, keeps the switching valve 18 closed against the action of the helical spring 20 located on the cam 16a of the tappet 16 at the end of the switching rod 14 .
  • the pipeline 11 coming from the oil space 4 for the working oil flow leads to the consumer (not shown in the drawing) in the form of a hydraulic system for actuating the unloading device. It is kept closed there until the unloading device is actuated.
  • the piston 6 When filling the oil space 4 , the piston 6 is pressed against the gas space 5 . At the end of the filling process, it bumps against the nut 28 on the shift rod 14 . This initiates the opening of the switching valve 18 with the cam 16a located at its other end. At the beginning of the valve opening, oil is discharged from the oil charging flow through the output part 17b of the oil channel containing the switching valve 18 . The pressure of the charging oil flow on the valve closing body 18a is reduced. The helical spring 20 arranged on the cam 16a with pretension suddenly abruptly opens the switching valve 18 . The original charging oil flow is now passed without pressure through the bypass line 19 and the oil channel 17a , 17b via the switching valve 18 past the pressure accumulator into an oil tank, not shown in the drawing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Vehicle Body Suspensions (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Claims (7)

  1. Accumulateur hydraulique à cylindre comportant un cylindre tubulaire (1) fermé sur les deux côtés et un piston mobile (8) subdivisant l'espace du cylindre en un espace d'huile (4) et un espace de gaz (5), susceptible d'être utilisé dans une installation hydraulique, dans lequel :
    a) une conduite tubulaire d'entrée (8) pour le flux d'huile de charge munie d'un clapet anti-retour (9) et une conduite tubulaire de sortie (11) pour le flux d'huile de travail munie d'un clapet anti-retour (12) sont raccordées respectivement à l'espace d'huile (4) et l'espace de gaz (5) est équipé d'une soupape de remplissage de gaz (13).
    b) sur le couvercle (3) du cylindre côté espace de gaz, est logée axialement de manière étanche au gaz une tige de commande (14) qui fait saillie dans l'espace de gaz (5) et peut se déplacer à travers le piston (6) dans la direction axiale à l'encontre de l'action d'un agencement élastique (15), cette tige se terminant, à son extrémité côté couvercle du cylindre, par un coulisseau (16) dépassant du logement et portant, à son extrémité côté piston, une butée (27) qui peut se déplacer avec lui,
    c) une partie centrale (3a) du couvercle (3) du cylindre faisant saillie du cylindre (1) est traversée par un canal d'huile (17a, 17b) coupant l'axe du cylindre, qui peut être fermé par une soupape de commande (18) agencée dans l'axe du cylindre, venant en contact avec le coulisseau (16) de la tige de commande (14) et s'ouvrant lorsqu'elle est pressée, et son côté d'entrée (17a) est connecté à la conduite tubulaire (8) menant à l'espace d'huile (4) pour le courant d'huile de charge via une conduite tubulaire de dérivation (19) qui contourne l'accumulateur hydraulique,
    caractérisé en ce que :
    d) la tige de commande (14) est entourée coaxialement par un tube d'écartement (23) limitant le chemin du piston (6) vers le côté de gaz, ce tube étant fixé par une extrémité à la face interne du couvercle (3) du cylindre, la tige de commande (14) dépassant du bord libre côté piston du tube d'écartement (23) sur une section partielle de la voie d'ouverture de la soupape de commande (18),
    e) à une certaine distance de l'extrémité côté piston du tube d'écartement (23) est agencé un fond intermédiaire (25) et entre celui-ci et la butée (27) est prévu un agencement élastique pré-tendu (15) agissant via la butée (27) sur la tige de commande (14) et s'appuyant sur le fond intermédiaire 25,
    f) la garniture d'étanchéité aux gaz permettant un mouvement axial de la tige de commande (14) entre la tige de commande (14) et le couvercle (3) du cylindre est constituée d'un soufflet métallique (32) élastique axialement et entourant la tige de commande (14) à faible distance, ledit soufflet étant fixé respectivement de manière étanche aux gaz, à sa première extrémité, sur le coulisseau (16) de la tige de commande (14) conformé en bouchon fileté et, à son autre extrémité, sur le bord côté piston d'une butée (29) en forme de cylindre creux agencée dans l'ouverture centrale du fond (23a) du tube d'écartement, la butée (29) étant fixée pour sa part de manière étanche aux gaz à la face interne du couvercle (3) du cylindre par un agencement intermédiaire d'un joint torique d'étanchéité (33) inséré dans une rainure annulaire.
  2. Accumulateur hydraulique à cylindre selon la revendication 1, caractérisé en ce que, sur une butée cylindrique axiale (16b) du coulisseau (16) à l'extrémité côté espace de gaz de la tige de commande (14), est agencé un ressort hélicoïdal (20) sous pré-tension qui s'appuie sur un épaulement annulaire (16b) du coulisseau (16) et agit contre le corps de fermeture (18a) de la soupape de fermeture (18), tandis que, sur la face arrière du corps de fermeture (18a) de la soupape, est agencé un ressort hélicoïdal (21) qui s'appuie sur le boîtier de la soupape et agit dans la direction de fermeture contre le corps de fermeture (18a) de la soupape, ledit ressort hélicoïdal étant plus faible que le ressort hélicoïdal (20) agencé sur la saillie (16a) du coulisseau (16).
  3. Accumulateur hydraulique à cylindre selon l'une quelconque des revendications 1 et 2, caractérisé en ce que le tube d'écartement (23) a, sur son extrémité côté couvercle du cylindre, un fond (23a) fixé à la face interne du couvercle (3) du cylindre, ce fond présentant coaxialement une butée (29) en forme de cylindre creux faisant saillie dans le tube d'écartement (23) et entourant la tige de commande (14) pour dégager un espace intermédiaire (30), l'espace creux de l'épaulement (29) se prolongeant par un alésage de même diamètre dans le couvercle (3) du cylindre, lequel alésage se convertit à l'intérieur du couvercle (3) du cylindre en un rétrécissement (31) en forme d'épaulement.
  4. Accumulateur hydraulique à cylindre selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'agencement élastique (15) prévu dans la section terminale libre du tube d'écartement (23) est constitué d'un paquet de ressorts à disques (26), qui est pré-tendu par un écrou (28) opérant sur la butée (27) et vissé sur un filet de l'extrémité côté piston de la tige de commande (14), l'écrou (28) faisant saillie du bord du tube d'écartement (23) dans une mesure correspondant à l'ouverture théorique de la soupape de commande (18) dans le canal d'huile (17a, 17b) du couvercle (3) du cylindre et servant de butée pour le piston (6) dans son chemin vers l'espace de gaz lors d'une opération de charge.
  5. Accumulateur hydraulique à cylindre selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le tube d'écartement (23) est fixé à la face interne du couvercle (3) du cylindre par des vis (23b) passant à travers le fond (23a) du tube d'écartement.
  6. Accumulateur hydraulique à cylindre selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le boitier de la soupape de commande (18) est fermé de manière accessible par un bouchon fileté (22) vissé axialement de l'extérieur et de manière étanche à l'huile dans le couvercle (3) du cylindre.
  7. Accumulateur hydraulique à cylindre selon l'une quelconque des revendications 1 à 6, caractérisé en ce que, sur le côté du corps de fermeture (18a) de la soupape tourné vers le siège (18c) de la soupape de commande (18) est agencée une garniture d'étanchéité annulaire (18d) constituée d'une matière élastique ou d'une matière similaire.
EP91117885A 1991-10-19 1991-10-19 Accumulateur à cylindre avec dispositif pour déconnecter l'huile de charge, incorporé dans un circuit hydraulique Expired - Lifetime EP0538501B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES91117885T ES2069170T3 (es) 1991-10-19 1991-10-19 Acumulador de presion del tipo de cilindro con dispositivo de desconexion de la corriente de aceite de carga en una instalacion hidraulica.
AT91117885T ATE116409T1 (de) 1991-10-19 1991-10-19 Zylinder-druckspeicher mit lade- ölstromabschalteinrichtung in einer hydraulikanlage.
DE59104086T DE59104086D1 (de) 1991-10-19 1991-10-19 Zylinder-Druckspeicher mit Lade-Ölstromabschalteinrichtung in einer Hydraulikanlage.
EP91117885A EP0538501B1 (fr) 1991-10-19 1991-10-19 Accumulateur à cylindre avec dispositif pour déconnecter l'huile de charge, incorporé dans un circuit hydraulique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91117885A EP0538501B1 (fr) 1991-10-19 1991-10-19 Accumulateur à cylindre avec dispositif pour déconnecter l'huile de charge, incorporé dans un circuit hydraulique

Publications (2)

Publication Number Publication Date
EP0538501A1 EP0538501A1 (fr) 1993-04-28
EP0538501B1 true EP0538501B1 (fr) 1994-12-28

Family

ID=8207269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91117885A Expired - Lifetime EP0538501B1 (fr) 1991-10-19 1991-10-19 Accumulateur à cylindre avec dispositif pour déconnecter l'huile de charge, incorporé dans un circuit hydraulique

Country Status (4)

Country Link
EP (1) EP0538501B1 (fr)
AT (1) ATE116409T1 (fr)
DE (1) DE59104086D1 (fr)
ES (1) ES2069170T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109058183B (zh) * 2018-10-16 2024-05-03 安徽博一流体传动股份有限公司 一种气液混合蓄压器
CN112728156B (zh) * 2020-12-31 2024-06-11 湖南鸿辉科技有限公司 一种具有速度分段控制的换向阀及应用装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB559648A (en) * 1942-07-22 1944-02-29 Vickers Armstrongs Ltd Improvements in or relating to hydraulic accumulator systems
CH246524A (de) * 1945-08-08 1947-01-15 & Giesserei Netstal Ag Maschf Druckmittel-Akkumulieranlage mit Aufladepumpe, insbesondere für den Einzelantrieb von hydraulisch betätigten Maschinen.
US2880746A (en) * 1957-06-07 1959-04-07 Gen Motors Corp Combination accumulator and unloading valve
FR1281356A (fr) * 1960-11-28 1962-01-12 Dispositif de commande pour circuit hydraulique
DE1185025B (de) * 1962-06-13 1965-01-07 Montan Hydraulik G M B H & Co Druckoelspeicher fuer hydraulische Einrichtungen mit Steuerung durch ein Ventil
FR2270465A1 (en) * 1974-04-02 1975-12-05 Alsthom Cgee Internal control for oil pressure accumulator - with relief valve actuated by irregular piston position

Also Published As

Publication number Publication date
EP0538501A1 (fr) 1993-04-28
ATE116409T1 (de) 1995-01-15
DE59104086D1 (de) 1995-02-09
ES2069170T3 (es) 1995-05-01

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