EP1270103B1 - Hydraulic working machine - Google Patents

Hydraulic working machine Download PDF

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Publication number
EP1270103B1
EP1270103B1 EP02450122A EP02450122A EP1270103B1 EP 1270103 B1 EP1270103 B1 EP 1270103B1 EP 02450122 A EP02450122 A EP 02450122A EP 02450122 A EP02450122 A EP 02450122A EP 1270103 B1 EP1270103 B1 EP 1270103B1
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EP
European Patent Office
Prior art keywords
working
hydraulic
tool
pressure
valve
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 - Fee Related
Application number
EP02450122A
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German (de)
French (fr)
Other versions
EP1270103A3 (en
EP1270103A2 (en
Inventor
Manfred Kurz
Thomas Reissig
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.)
Hoerbiger Automatisierungstechnik Holding GmbH
Original Assignee
Hoerbiger Automatisierungstechnik Holding GmbH
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Publication date
Application filed by Hoerbiger Automatisierungstechnik Holding GmbH filed Critical Hoerbiger Automatisierungstechnik Holding GmbH
Publication of EP1270103A2 publication Critical patent/EP1270103A2/en
Publication of EP1270103A3 publication Critical patent/EP1270103A3/en
Application granted granted Critical
Publication of EP1270103B1 publication Critical patent/EP1270103B1/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D55/00—Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/28—Arrangements for preventing distortion of, or damage to, presses or parts thereof

Definitions

  • the invention relates to a hydraulic working machine, with at least one under pressure in the piston side working space a tool in the working movement moving cylinder, which has a greatly reduced compared to the piston side cross-section in the tool-pressure rod-side working space in the tool reset, and its outflow from the rod-side working space Emergency stop of the tool in the operation via the associated control valve can be shut off.
  • the present invention has for its object to avoid the disadvantages described and in particular to improve a hydraulic working machine of the type mentioned so that the emergency stop path can be significantly shortened, preferably to the range of about 1 mm.
  • the invention is based on the consideration that the always assumed in connection with hydraulic systems internal stiffness (non-compressibility of a liquid) of the system at the comparatively small cross-sections on the rod side of the described hydraulic working machines no longer given or at least significantly reduced.
  • the rod-side working space during emergency stop via a fast-switching emergency valve with a separate high-pressure hydraulic medium source is connectable. This can be ensured after the triggering of an emergency stop within a very short time an active braking of the working cylinder, so that the mentioned safety requirements are easy to fulfill.
  • the high-pressure hydraulic medium source is formed by a pressure accumulator which can be filled via a separate port. This can be done (in contrast, for example, to a separate high-pressure pump) extremely rapid provision of the required in the event of an emergency stop high-pressure medium, which can then be refilled again, for example, via a separate pump in the pressure accumulator.
  • the emergency valve is arranged in the immediate vicinity of the rod-side working space and controls a relation to the medium connections significantly larger cross-section. These too Measure serves to further improve the instantaneous and unimpeded response of the emergency stop system.
  • the piston-side working chamber 1 or its connecting line 9 is also controllable via the control valve 8 - further compensation or Nachsaugventile, pressure relief valves, connecting lines, pumps, tanks and similar for the operation of such machines usually required elements are not essential in the invention and in itself known for the sake of simplicity and clarity not shown.
  • a fast-switching emergency valve 12 is arranged over a, compared to the working medium connections (lines 9,9 ') significantly larger cross-section 10 having connecting hole 11, which at the emergency stop the rod-side working space 6 with a separate high pressure -Hydraulikmediumquelle 13 - here designed as a fillable via a separate terminal 14 pressure accumulator 15 - connects.
  • the piston 16 of the working cylinder 4 could also be at a momentary complete shut-off of the control valve 8 according to the very small effective Cross-section 7 of the rod-side working chamber 6 by the not unlimited high stiffness of the hydraulic medium therein still further decrease or oscillate, which may occur in accordance with heavy and thus massenträgem tool 2, a stop-way of up to 10 mm in practice. If, however, high-pressure medium is supplied from the pressure accumulator 15 via the relatively large cross-section 10 of the connecting bore 11 at the same time, this stop path can be drastically reduced - up to about 1 mm in the order of magnitude.
  • the quick-switching emergency valve 12 is formed in the example shown as a pilot operated 2/2-way seat valve whose axial connection is connected to the rod-side working chamber 6 and whose radial port is connected to the pressure accumulator 15. Via a nozzle in the valve cone, the control chamber of the seat valve is connected to the radial connection of the seat valve. Furthermore, the control chamber of the seat valve is shut off by a spring-loaded magnet armature, whose spring end face opposite is formed as a sealing cone with currentless magnet. In the illustrated de-energized state of the magnet, both the working space 6 and the pressure accumulator 15 are hermetically sealed.
  • the pressure in the reservoir 15 biases both the sealing cone of the spring-loaded magnet armature and the valve cone of the 2/2-way stub valve in the opening direction.
  • An energizing of the magnet shifts the armature against the compression spring and opens the control chamber of the seat valve to the tank.
  • the storage pressure acting only on the annular surface in the radial connection to the valve cone exerts a very high force on the valve cone in the opening direction and thus leads to a very short opening time.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)

Description

Die Erfindung betrifft eine hydraulische Arbeitsmaschine, mit zumindest einem unter Druck im kolbenseitigen Arbeitsraum ein Werkzeug im Arbeitsgang bewegenden Arbeitszylinder, der in dem bei der Werkzeugrückstellung unter Druck stehenden stangenseitigen Arbeitsraum einen gegenüber der Kolbenseite stark verkleinerten Querschnitt aufweist, und dessen Abfluß aus dem stangenseitigen Arbeitsraum zum Not-Stop des Werkzeuges im Arbeitsgang über das zugehörige Regelventil absperrbar ist.The invention relates to a hydraulic working machine, with at least one under pressure in the piston side working space a tool in the working movement moving cylinder, which has a greatly reduced compared to the piston side cross-section in the tool-pressure rod-side working space in the tool reset, and its outflow from the rod-side working space Emergency stop of the tool in the operation via the associated control valve can be shut off.

Bei derartigen Arbeitsmaschinen, wie etwa hydraulischen Abkantpressen od.dgl., geht speziell in den letzten Jahren der Trend immer mehr dahin, das Querschnittsverhältnis zwischen Kolbenraum und Stangenraum immer weiter zu vergrößern, da damit auf einfache Weise schnelle Rückzugsbewegungen des Werkzeugs (mit relativ geringer erforderlicher Kraft) und langsame Arbeitsbewegungen (mit möglichst hoher Kraft) realisierbar sind. Nachdem gleichzeitig auch im Bereich derartiger Arbeitsmaschinen die Sicherheitsauflagen immer weiter erhöht werden, hat sich gezeigt, daß die bisher üblichen Not-Stop-Anordnungen, bei denen entweder beide Arbeitsräume oder zumindest der stangenseitige Arbeitsraum im Arbeitsgang einfach über das zugehörige Regelventil abgesperrt werden, kein ausreichend schnelles Anhalten des zumeist große Massenträgheit aufweisenden Werkzeuges auf kurzem Wege erlauben. Speziell bei großen Abkantpressen u.dgl. Maschinen können bei heute üblichen Auslegungen durchaus Haltewege von 5 bis 10 mm auftreten, auch wenn (in der Praxis nicht realisierbare) Null-Schließzeiten der Regelventile angenommen werden.In such machines, such as hydraulic press brakes or the like., Especially in recent years, the trend is more and more to increase the cross-sectional relationship between the piston chamber and rod space ever further, since thus in a simple way rapid retraction movements of the tool (with relatively less required Force) and slow working movements (with the highest possible force) can be realized. After simultaneously increasing the safety requirements in the field of such machines, it has been shown that the usual emergency stop arrangements in which either both workrooms or at least the rod-side working space in the operation are simply shut off via the associated control valve, not sufficient allow rapid stopping of the usually large inertia having tool in a short way. Especially with large press brakes and the like. With today's usual designs, machines can certainly have holding paths of 5 to 10 mm, even if (in practice not realizable) zero closing times of the control valves are assumed.

Die vorliegende Erfindung setzt sich zur Aufgabe, die beschriebenen Nachteile zu vermeiden und insbesonders eine hydraulische Arbeitsmaschine der eingangs angesprochenen Art so zu verbessern, daß der Not-Halt-Weg signifikant verkürzt werden kann, vorzugsweise bis in den Bereich von etwa 1 mm.The present invention has for its object to avoid the disadvantages described and in particular to improve a hydraulic working machine of the type mentioned so that the emergency stop path can be significantly shortened, preferably to the range of about 1 mm.

Die Erfindung geht aus von der Überlegung, daß die in Zusammenhang mit hydraulischen Systemen stets angenommene innere Steifigkeit (Nichtkomprimierbarkeit einer Flüssigkeit) des Systems bei den vergleichsweise kleinen Querschnitten auf der Stangenseite der beschriebenen hydraulischen Arbeitsmaschinen keineswegs mehr gegeben bzw. zumindest signifikant verringert ist. Um der damit auf der Stangenseite gegebenen Kompressibilität des Mediumvolumens zu begegnen, wird zur Lösung der gestellten Aufgabe gemäß der vorliegenden Erfindung vorgesehen, daß der stangenseitige Arbeitsraum beim Not-Stop über ein schnell schaltendes Not-Ventil mit einer separaten Hochdruck-Hydraulikmediumquelle verbindbar ist. Damit kann nach dem Auslösen eines Not-Stops binnen kürzester Zeit ein aktives Abbremsen des Arbeitszylinders sichergestellt werden, womit die angesprochenen Sicherheitsauflagen einfach erfüllbar sind.The invention is based on the consideration that the always assumed in connection with hydraulic systems internal stiffness (non-compressibility of a liquid) of the system at the comparatively small cross-sections on the rod side of the described hydraulic working machines no longer given or at least significantly reduced. In order to counteract the given on the rod side compressibility of the medium volume, is provided for solving the problem according to the present invention that the rod-side working space during emergency stop via a fast-switching emergency valve with a separate high-pressure hydraulic medium source is connectable. This can be ensured after the triggering of an emergency stop within a very short time an active braking of the working cylinder, so that the mentioned safety requirements are easy to fulfill.

Es ist an dieser Stelle anzumerken, daß in gewisser Weise ähnliche Vorkehrungen im Pneumatikbereich in Zusammenhang mit dem Abbremsen des Kolbens in einem pneumatischen Arbeitszylinder, z.B. im Bereich seiner Bewegungsendstellungen bekannt sind, wobei allerdings bei diesen pneumatischen Anwendungen nur relativ geringfügige Einflußnahmen auf die Kolbenbewegung möglich und erwünscht sind - ein Not-Stop bzw. ein präzises Anund Festhalten erfolgt bei diesen Anwendungen stets über separat angeordnete mechanische Bremsen, Rastensperren od.dgl.It should be noted at this point that somewhat similar arrangements in the pneumatic field related to the deceleration of the piston in a pneumatic cylinder, e.g. are known in the field of movement end positions, although only relatively minor influence on the piston movement are possible and desirable in these pneumatic applications - an emergency stop or a precise Anund detention always takes place in these applications via separately arranged mechanical brakes, tiller locks or the like ,

Zur weiteren Verbesserung der Stop-Sicherheit bzw. Verkürzung des Stopweges ist in bevorzugter Ausgestaltung der Erfindung vorgesehen, daß die Hochdruck-Hydraulikmediumquelle von einem Druckspeicher gebildet ist, der über einen separaten Anschluß befüllbar ist. Damit kann ein (im Gegensatz beispielsweise zu einer separaten Hochdruck-Pumpe) extrem rasches Zurverfügungstellen des im Falle eines Not-Stops erforderlichen Hochdruckmediums erfolgen, welches anschließend wieder beispielsweise über eine separate Pumpe in den Druckspeicher nachgefüllt werden kann.To further improve the stop safety or shortening of the stop path is provided in a preferred embodiment of the invention that the high-pressure hydraulic medium source is formed by a pressure accumulator which can be filled via a separate port. This can be done (in contrast, for example, to a separate high-pressure pump) extremely rapid provision of the required in the event of an emergency stop high-pressure medium, which can then be refilled again, for example, via a separate pump in the pressure accumulator.

Nach einer weiters bevorzugten Ausgestaltung der Erfindung ist vorgesehen, daß das Notventil in unmittelbarer Nähe des stangenseitigen Arbeitsraumes angeordnet ist und einen gegenüber den Mediumanschlüssen signifikant größeren Querschnitt steuert. Auch diese Maßnahme dient einer weiteren Verbesserung des möglichst unverzögerten und unbehinderten Ansprechens des Not-Stop-Systems.According to a further preferred embodiment of the invention it is provided that the emergency valve is arranged in the immediate vicinity of the rod-side working space and controls a relation to the medium connections significantly larger cross-section. These too Measure serves to further improve the instantaneous and unimpeded response of the emergency stop system.

Die Erfindung wird im folgenden anhand des in der Zeichnung schematisch dargestellten Ausführungsbeispiels näher erläutert.The invention will be explained in more detail below with reference to the embodiment schematically illustrated in the drawing.

Von einer hydraulischen Arbeitsmaschine, beispielsweise einer hydraulischen Abkantpresse, ist hier nur ein unter Druck im kolbenseitigen Arbeitsraum 1 ein symbolisch angedeutetes Werkzeug 2 im Arbeitsgang (Richtung des Pfeiles 3) bewegender Arbeitszylinder 4 dargestellt, der in dem bei der Werkzeugrückstellung (Richtung des Pfeiles 5) unter Druck stehenden stangenseitigen Arbeitsraum 6 einen gegenüber der Kolbenseite (1) stark verkleinerten Querschnitt 7 aufweist und dessen Abfluß aus dem stangenseitigen Arbeitsraum 6 zum Not-Stop des Werkzeuges 2 im Arbeitsgang (Pfeil 3) über das zugehörige Regelventil 8 absperrbar ist.From a hydraulic working machine, for example a hydraulic press brake, only one under pressure in the piston-side working space 1 a symbolically indicated tool 2 in the operation (direction of arrow 3) moving working cylinder 4 is shown in the in the tool reset (direction of arrow 5) under pressure rod-side working space 6 has a relation to the piston side (1) greatly reduced cross-section 7 and its drain from the rod-side working space 6 for emergency stop of the tool 2 in the operation (arrow 3) via the associated control valve 8 can be shut off.

Der kolbenseitige Arbeitsraum 1 bzw. dessen Anschlußleitung 9 ist ebenfalls über das Regelventil 8 steuerbar - weitere Ausgleichs- bzw. Nachsaugventile, Druckbegrenzungsventile, Verbindungsleitungen, Pumpen, Tanks und ähnliche für den Betrieb derartiger Arbeitsmaschinen üblicherweise erforderliche Elemente sind als im Rahmen der Erfindung nicht weiter wesentlich und an sich bekannt der Einfachheit und der Übersichtlichkeit wegen nicht dargestellt.The piston-side working chamber 1 or its connecting line 9 is also controllable via the control valve 8 - further compensation or Nachsaugventile, pressure relief valves, connecting lines, pumps, tanks and similar for the operation of such machines usually required elements are not essential in the invention and in itself known for the sake of simplicity and clarity not shown.

In unmittelbarer Nähe des stangenseitigen Arbeitsraumes 6 ist über eine, gegenüber den Arbeitsmediumanschlüssen (Leitungen 9,9') signifikant größeren Querschnitt 10 aufweisende Verbindungsbohrung 11 ein schnell schaltendes Not-Ventil 12 angeordnet, welches beim Not-Stop den stangenseitigen Arbeitsraum 6 mit einer separaten Hochdruck-Hydraulikmediumquelle 13 - hier ausgebildet als über einen separaten Anschluß 14 befüllbarer Druckspeicher 15 - verbindet.In the immediate vicinity of the rod-side working space 6, a fast-switching emergency valve 12 is arranged over a, compared to the working medium connections (lines 9,9 ') significantly larger cross-section 10 having connecting hole 11, which at the emergency stop the rod-side working space 6 with a separate high pressure -Hydraulikmediumquelle 13 - here designed as a fillable via a separate terminal 14 pressure accumulator 15 - connects.

Wie leicht einsichtig ist, könnte der Kolben 16 des Arbeitszylinders 4 auch bei einem momentanen kompletten Absperren des Regelventils 8 zufolge des sehr kleinen wirksamen Querschnitts 7 des stangenseitigen Arbeitsraumes 6 durch die nicht unbegrenzt hohe Steifigkeit des darin befindlichen Hydraulikmediums noch weiter absinken bzw. schwingen, wodurch bei entsprechend schwerem und damit massenträgem Werkzeug 2 noch ein Stop-Weg von bis zu 10 mm in der Praxis auftreten kann. Wenn nun aber gleichzeitig über den relativ großen Querschnitt 10 der Verbindungsbohrung 11 Hochdruckmedium vom Druckspeicher 15 her zugeführt wird, kann dieser Stop-Weg drastisch reduziert werden - größenordnungsmäßig bis auf etwa 1 mm.As can easily be appreciated, the piston 16 of the working cylinder 4 could also be at a momentary complete shut-off of the control valve 8 according to the very small effective Cross-section 7 of the rod-side working chamber 6 by the not unlimited high stiffness of the hydraulic medium therein still further decrease or oscillate, which may occur in accordance with heavy and thus massenträgem tool 2, a stop-way of up to 10 mm in practice. If, however, high-pressure medium is supplied from the pressure accumulator 15 via the relatively large cross-section 10 of the connecting bore 11 at the same time, this stop path can be drastically reduced - up to about 1 mm in the order of magnitude.

Das schnell schaltende Notventil 12 ist im dargestellten Beispiel als vorgesteuertes 2/2-Wege-Sitzventil ausgebildet, dessen axialer Anschluss mit dem stangenseitigen Arbeitsraum 6 verbunden ist und dessen radialer Anschluss mit dem Druckspeicher 15 verbunden ist. Über eine Düse im Ventilkegel ist der Steuerraum des Sitzventils mit dem radialen Anschluss des Sitzventils verbunden. Des weiteren wird der Steuerraum des Sitzventils durch einen federbelasteten Magnetanker, dessen der Feder gegenüberliegende Stirnseite als Dichtkegel ausgebildet ist, bei stromlosem Magneten abgesperrt. Im dargestellten stromlosen Zustand des Magneten sind sowohl der Arbeitsraum 6 als auch der Druckspeicher 15 hermetisch abgedichtet. Der Druck im Speicher 15 spannt sowohl den Dichtkegel des federbelasteten Magnetankers als auch den Ventilkegel des 2/2-Wege-Stizventils in Öffnungsrichtung vor. Ein Bestromen des Magneten verschiebt den Magnetanker gegen die Druckfeder und öffnet den Steuerraum des Sitzventils zum Tank. Der nur noch auf die Ringfläche im radialen Anschluss auf den Ventilkegel wirkende Speicherdruck übt eine sehr hohe Kraft auf den Ventilkegel in Öffnungsrichtung aus und führt so zu einer sehr kurzen Öffnungszeit.The quick-switching emergency valve 12 is formed in the example shown as a pilot operated 2/2-way seat valve whose axial connection is connected to the rod-side working chamber 6 and whose radial port is connected to the pressure accumulator 15. Via a nozzle in the valve cone, the control chamber of the seat valve is connected to the radial connection of the seat valve. Furthermore, the control chamber of the seat valve is shut off by a spring-loaded magnet armature, whose spring end face opposite is formed as a sealing cone with currentless magnet. In the illustrated de-energized state of the magnet, both the working space 6 and the pressure accumulator 15 are hermetically sealed. The pressure in the reservoir 15 biases both the sealing cone of the spring-loaded magnet armature and the valve cone of the 2/2-way stub valve in the opening direction. An energizing of the magnet shifts the armature against the compression spring and opens the control chamber of the seat valve to the tank. The storage pressure acting only on the annular surface in the radial connection to the valve cone exerts a very high force on the valve cone in the opening direction and thus leads to a very short opening time.

Claims (3)

  1. A hydraulic working machine, with at least one working cylinder (4) moving a tool (2) in the working direction (arrow 3) under pressure in the working chamber (1) on the piston side, which cylinder has, in the working chamber (6) on the rod side that is under pressure during retraction of the tool (arrow 5), a greatly reduced cross-section (7) relative to the piston side, and the outflow of said cylinder from the working chamber (6) on the rod side can be blocked off via the associated regulating valve (8) to effect an emergency stop of the tool (2) in the working direction (arrow 3),
    characterized in that
    during an emergency stop the working chamber (6) on the rod side can be connected to a separate high-pressure hydraulic medium source via a fast-switching emergency valve (12).
  2. The hydraulic working machine according to Claim 1,
    characterized in that
    the high-pressure hydraulic medium source is formed from a pressure reservoir (15), which can be filled via a separate connection (14).
  3. The hydraulic working machine of Claim 1 or 2,
    characterized in that
    the emergency valve (12) is arranged in the immediate vicinity of the working chamber (6) on the rod side, and controls a significantly greater cross-section relative to the working medium connections (14).
EP02450122A 2001-06-27 2002-05-22 Hydraulic working machine Expired - Fee Related EP1270103B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT9972001A AT410469B (en) 2001-06-27 2001-06-27 HYDRAULIC WORKING MACHINE
AT9972001 2001-06-27

Publications (3)

Publication Number Publication Date
EP1270103A2 EP1270103A2 (en) 2003-01-02
EP1270103A3 EP1270103A3 (en) 2005-10-05
EP1270103B1 true EP1270103B1 (en) 2008-04-02

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Application Number Title Priority Date Filing Date
EP02450122A Expired - Fee Related EP1270103B1 (en) 2001-06-27 2002-05-22 Hydraulic working machine

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EP (1) EP1270103B1 (en)
AT (1) AT410469B (en)
DE (1) DE50212001D1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08121416A (en) * 1994-10-24 1996-05-14 Tokyo Isuzu Jidosha Kk Hydraulic system with accumulator

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2542665C2 (en) * 1975-09-25 1986-02-06 Hartmann & Lämmle GmbH & Co KG, 7255 Rutesheim Arrangement for the impact-free decompression of a pressure medium-operated, in particular hydraulic system
DE2856583C2 (en) * 1978-12-22 1985-02-07 Alfred Dipl.-Ing. 1000 Berlin Ulrich Three-point hitch for a tractor with a rear and / or front attachment
JPH03229003A (en) * 1989-12-04 1991-10-11 Hitachi Constr Mach Co Ltd Hydraulic motor driving circuit
JPH07119860A (en) * 1993-10-20 1995-05-12 Nisshinbo Ind Inc Liquid pressure direction control device and liquid pressure operating device using the control device
DE4416955A1 (en) * 1994-05-13 1994-12-01 Ulrich Keller Relief valve
DE19711207A1 (en) * 1997-03-18 1998-09-24 Schuler Pressen Gmbh & Co Pulling device for a press
AT408851B (en) * 1998-03-03 2002-03-25 Hoerbiger Hydraulik HYDRAULIC PRESS

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08121416A (en) * 1994-10-24 1996-05-14 Tokyo Isuzu Jidosha Kk Hydraulic system with accumulator

Also Published As

Publication number Publication date
EP1270103A3 (en) 2005-10-05
DE50212001D1 (en) 2008-05-15
EP1270103A2 (en) 2003-01-02
AT410469B (en) 2003-05-26
ATA9972001A (en) 2002-09-15

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