EP0631057B2 - Piston with a sealing - Google Patents

Piston with a sealing Download PDF

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Publication number
EP0631057B2
EP0631057B2 EP94103900A EP94103900A EP0631057B2 EP 0631057 B2 EP0631057 B2 EP 0631057B2 EP 94103900 A EP94103900 A EP 94103900A EP 94103900 A EP94103900 A EP 94103900A EP 0631057 B2 EP0631057 B2 EP 0631057B2
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EP
European Patent Office
Prior art keywords
piston
supporting body
housing
sealing
permanent magnet
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
EP94103900A
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German (de)
French (fr)
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EP0631057B1 (en
EP0631057A1 (en
Inventor
Gonzalo Barillas
Guido Destefanis
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Carl Freudenberg KG
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Carl Freudenberg KG
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Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Publication of EP0631057A1 publication Critical patent/EP0631057A1/en
Publication of EP0631057B1 publication Critical patent/EP0631057B1/en
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Classifications

    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2807—Position switches, i.e. means for sensing of discrete positions only, e.g. limit switches

Definitions

  • the invention relates to a piston with seal. According to the preamble of Claim 1.
  • Such a piston is from the Italian utility model 53974-B / 86 known.
  • the piston which is connected to a piston rod and im cylindrical housing is axially movable, is for sealing the in Axial direction adjacent sub-spaces, the housing with a Seal.
  • the seal is designed as a complete piston, whereby this consists of three components.
  • the two piston halves made up of one non-magnetic carrier material and an elastomeric sealing material exist, enclose a permanent magnet, which is used to query the position of the Piston is needed.
  • the housing is on its outer circumference Provide magnetic field sensors that conduct signals with a display device are connected. Furthermore, the housing is in the axial direction on both sides of the Provide the piston with a compressed air connection.
  • the seal should be noted that it consists of several individual parts exists, which is both in manufacturing technology and in economic Is not very satisfactory.
  • From DE-7 635 587 is a pneumatic or hydraulic piston-cylinder unit known, the at least one arranged on the cylinder Magnetic switch and a piston having at least one in a groove arranged magnetic element is provided.
  • the magnetic element is a flexible, slotted magnetic tape that fits into a groove of the one-piece piston is inserted, one around the magnetic tape Sliding guide band is arranged inside the cylinder.
  • the Guide belt is made of a slidable plastic and slides during of operation along the inner wall of the cylinder. Both that Magnetic element as well as the guide band can be due to the slot bent and with its cut edges on the circumference over the piston pushed and inserted into the groove.
  • the pistons are in radial Provided circumferential grooves sealing elements, the sealing lip protrudes outside the piston in the radial direction and with the inner wall of the cylinder can be sealingly engaged.
  • the magnetic element and that Piston receiving guide element is itself formed in one piece.
  • the invention has for its object a piston of the known type to develop in such a way that it consists of fewer individual parts as well is easier and cheaper to manufacture.
  • the support body is formed in one piece and is connected to the permanent magnet.
  • the entire seal, which is designed as a complete piston can consist of only one component.
  • the permanent magnet is for example encapsulated by the polymeric material of the support body, the support body also being molded is in turn encapsulated with the elastomeric material of the sealing lip.
  • the support body completely surrounds the permanent magnet, the Permanent magnet on the side of the support body facing the housing is arranged.
  • the permanent magnet is as good as possible To arrange signal transmission in the area of the outer circumference of the support body. Due to the complete sheathing, the permanent magnet is in front of the outside Influences, such as impact loads that impair functionality protected and is always in a defined position in the piston.
  • a guide ring is arranged between the axially adjacent sealing lips, which is formed in one piece with the support body, the guide ring is slidably engageable with the housing.
  • the seal is advantageous in that tilting movements and Tilting related to the housing can be avoided.
  • the elastomer The material of the two sealing lips can be in the area of Outer peripheral boundary of the support body, where the material of the two sealing lips past the inner circumference of the support body is integrally formed into one another. This is a seal of the piston on the piston rod.
  • the supporting body, which also Guide ring includes, can consist of a suitable material or on the side facing the housing with a friction-reducing Be surface coating
  • the support body can have an axial spacing from one another Be sealing lips connected, the sealing lips in one piece transiently formed and in each case in the area of a boundary on the strin side of the support body are arranged.
  • the guide ring can be made of PTFE. Different polymers Materials that also have a low coefficient of friction and a good one Can also be resistant to abrasive wear apply.
  • Fig. 1 the piston according to the invention with a seal as a complete piston shown, which is arranged within a housing 6.
  • the housing 6 is in Area of its limits on the strins side, each with a compressed air connection 9, 10 provided to alternately pressurize the piston 5 and move back and forth in the axial direction.
  • To query the position of the piston 5 In the housing 6 there are 6 magnetic field sensors 11, 11 on the housing arranged, which are connected in a signal-conducting manner to a display device 12.
  • the piston 5 moves under one of the magnetic field sensors 11, 11 through, there is a corresponding signal on the display device 12.
  • Der Piston is stepped on a diameter Piston rod 13 mounted in the axial direction on the one hand through the housing 6 is passed.
  • the piston 5 from FIG. 1 is shown as an individual part.
  • the piston 5 comprises a support body 1, which consists of PTFE in this embodiment.
  • the Support body 1 completely surrounds the permanent magnet 2 and is in the area formed on its outer circumference as a guide ring 7.
  • the Outside diameter of the guide ring 7 is smaller in the unassembled state, than the outer diameter of the two sealing lips 3.1, 3.2 in manufacturing-related condition, so that this in the installed state with a radial prestress touch the inner wall of the housing 6 sealingly.
  • the sealing lips 3.1, 3.2 are on both sides of the support body 1 in the axial direction assigned adjacent and integrally formed into one another.
  • Sealing lips 3.1, 3.2 also guided past the inner circumference of the supporting body 1, in the area in which it is supported on a piston rod 13.
  • the entire piston is made in one piece.
  • the support body 1 and the Permanent magnet 2 are connected to each other, the permanent magnet 2 is completely surrounded by the supporting body 1 on the circumference.
  • the supporting body 1 is in turn adhesively connected to the sealing lip 3.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Actuator (AREA)
  • Gasket Seals (AREA)

Abstract

Seal for a piston operated by a fluidic medium, containing a supporting body (1) of non-magnetisable material, which at least partly encloses an annular permanent magnet (2) and is connected to at least one sealing lip (3) of elastomeric material, in which arrangement the sealing lip (3) projects on the outside beyond the supporting body (1) in the radial direction and can be brought into sealing engagement with the inner wall (4) of a housing (6) surrounding the piston (5). The supporting body (1) is of one-piece design and is connected to the permanent magnet (2). <IMAGE>

Description

Die Erfindung betrifft einen Kolben mit Dichtung.gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a piston with seal. According to the preamble of Claim 1.

Ein solcher Kolben ist aus dem italienischen Gebrauchsmuster 53974-B/86 bekannt. Der Kolben, der mit einer Kolbenstange verbunden und im zylindrischen Gehäuse axial beweglich angeordnet ist, ist zur Abdichtung der in axialer Richtung zueinander benachbarten Teilräume das Gehäuses mit einer Dichtung versehen. Die Dichtung ist als Komplettkolben ausgebildet, wobei dieser aus drei Bauteilen besteht. Die beiden Kolbenhälften, die aus einem nichtmagnetischen Trägerwerkstoff und einem elastomeren Dichtungswerkstoff bestehen, umschließen einen Permanentmagnet, der zur Positionsabfrage des Kolbens benötigt wird. Das Gehäuse ist auf seiner Außenumfangsseite mit Magnetfeldaufnehmern versehen, die signalleitend mit einem Anzeigegerät verbunden sind. Ferner ist das Gehäuse in axialer Richtung beiderseits des Kolbens jeweils mit einem Druckluftanschluß versehen. Bei der Ausgestaltung der Dichtung ist allerdings zu beachten, daß diese aus mehreren Einzelteilen besteht, was sowohl in fertigungstechnischer als auch in wirtschaftlicher Hinsicht wenig befriedigend ist. Such a piston is from the Italian utility model 53974-B / 86 known. The piston, which is connected to a piston rod and im cylindrical housing is axially movable, is for sealing the in Axial direction adjacent sub-spaces, the housing with a Seal. The seal is designed as a complete piston, whereby this consists of three components. The two piston halves made up of one non-magnetic carrier material and an elastomeric sealing material exist, enclose a permanent magnet, which is used to query the position of the Piston is needed. The housing is on its outer circumference Provide magnetic field sensors that conduct signals with a display device are connected. Furthermore, the housing is in the axial direction on both sides of the Provide the piston with a compressed air connection. When designing However, the seal should be noted that it consists of several individual parts exists, which is both in manufacturing technology and in economic Is not very satisfactory.

Aus der DE-7 635 587 ist eine pneumatische oder hydraulische Kolben-Zylinder-Einheit bekannt, die mindestens einen am Zylinder angeordneten Magnetschalter und einen Kolben aufweist, welcher mit mindestens einem in einer Nut angeordneten Magnetelement versehen ist. Das Magnetelement ist ein flexibles, geschlitztes Magnetband, das in eine vom Umfang her offene Nut des einteiligen Kolbens eingelegt ist, wobei um das Magnetband ein an der Zylinderinnenwandung gleitendes Führungsband angeordnet ist. Das Führungsband besteht aus einem gleitfähigen Kunststoff und gleitet während des Betriebes an der Innenwandung des Zylinders entlang. Sowohl das Magnetelement als auch das Führungsband kann aufgrund des Schlitzes aufgebogen und mit seinen Schnittkanten umfangsseitig über den Kolben geschoben und in die Nut eingelegt werden. An dem Kolben sind in radialen Umfangsnuten angeordnete Dichtungselemente vorgesehen, deren Dichtlippe den Kolben in radialer Richtung außenseitig überragt und mit der Innenwandung des Zylinders dichtend in Eingriff bringbar ist. Der das Magnetelement und das Führungselement aufnehmende Kolben ist selbst einstückig ausgebildet. From DE-7 635 587 is a pneumatic or hydraulic piston-cylinder unit known, the at least one arranged on the cylinder Magnetic switch and a piston having at least one in a groove arranged magnetic element is provided. The magnetic element is a flexible, slotted magnetic tape that fits into a groove of the one-piece piston is inserted, one around the magnetic tape Sliding guide band is arranged inside the cylinder. The Guide belt is made of a slidable plastic and slides during of operation along the inner wall of the cylinder. Both that Magnetic element as well as the guide band can be due to the slot bent and with its cut edges on the circumference over the piston pushed and inserted into the groove. The pistons are in radial Provided circumferential grooves sealing elements, the sealing lip protrudes outside the piston in the radial direction and with the inner wall of the cylinder can be sealingly engaged. The magnetic element and that Piston receiving guide element is itself formed in one piece.

Der Erfindung liegt die Aufgabe zugrunde, einen Kolben der vorbekannten Art derart weiterzuentwickeln, daß er aus weniger Einzelteilen besteht sowie einfacher und kostengünstiger herstellbar ist.The invention has for its object a piston of the known type to develop in such a way that it consists of fewer individual parts as well is easier and cheaper to manufacture.

Diese Aufgabe wird erfindungsgemäß mit dem kennzeichnenden Merkmal von Anspruch 1 gelöst. Auf vorteilhafte Ausgestaltungen nehmen die Unteransprüche Bezug.This object is achieved with the characteristic feature of Claim 1 solved. The subclaims take on advantageous embodiments Reference.

Bei der erfindungsgemäßen Dichtung ist es vorgesehen, daß der Tragkörper einstückig ausgebildet und mit dem Permanentmagnet verbunden ist. Hierbei ist von Vorteil, daß die gesamte Dichtung, die als Komplettkolben ausgebildet sein kann, aus nur einem Bauteil besteht. Der Permamentmagnet ist beispielsweise vom polymeren Werkstoff des Tragkörpers umspritzt wobei auch der Tragkörper seinerseits mit dem elastomeren Werkstoff der Dichtlippe umspritzt ist. Die Herstellung eines derartigen Bauteils kann in einem Arbeitsgang erfolgen, was in fertigungstechnischer Hinsicht günstig und in wirtschaftlicher Hinsicht von hervorzuhebender Bedeutung ist.In the seal according to the invention it is provided that the support body is formed in one piece and is connected to the permanent magnet. Here is It is advantageous that the entire seal, which is designed as a complete piston can consist of only one component. The permanent magnet is for example encapsulated by the polymeric material of the support body, the support body also being molded is in turn encapsulated with the elastomeric material of the sealing lip. The Such a component can be produced in one operation, what cheap in terms of production technology and economical in terms of is to be emphasized.

Der Tragkörper umschließt den Permanentmagnet vollständig, wobei der Permanentmagnet auf der dem Gehäuse zugewandten Seite des Tragkörpers angeordnet ist. Der Permanentmagnet ist im Hinblick auf eine möglichst gute Signalübertragung im Bereich des Außenumfangs des Tragkörpers anzuordnen. Durch die vollständige Ummantelung ist der Permanentmagnet vor äußeren Einflüssen, beispielsweise funktionsbeeinträchtigende Stoßbelastungen geschützt und befindet sich immer in einer definierten Stellung im Kolben.The support body completely surrounds the permanent magnet, the Permanent magnet on the side of the support body facing the housing is arranged. The permanent magnet is as good as possible To arrange signal transmission in the area of the outer circumference of the support body. Due to the complete sheathing, the permanent magnet is in front of the outside Influences, such as impact loads that impair functionality protected and is always in a defined position in the piston.

Zwischen den axial benachbarten Dichtlippen ist ein Führungsring angeordnet, der mit dem Tragkörper einstückig ausgebildet ist, wobei der Führungsring gleitend mit dem Gehäuse in Eingriff bringbar ist. Bei Verwendung der Dichtung als Komplettkolben ist hierbei von Vorteil, daß Kippbewegungen und Verkantungen bezogen auf das Gehäuse vermieden werden. Der elastomere Werkstoff der beiden Dichtlippen kann dazu im Bereich der außenumfangsseitigen Begrenzung des Tragkörpers ausgespart sein, wobei der Werkstoff der beiden Dichtlippen am Innenumfang des Tragkörpers vorbei einstückig ineinander übergehend ausgebildet ist. Dadurch ist eine Abdichtung des Kolbens auf der Kolbenstange bedingt. Der Tragkörper, der auch den Führungsring umfaßt, kann dazu aus einem geeigneten Werkstoff bestehen oder auf der dem Gehäuse zugewandten Seite mit einer reibungsverringernden Oberflächenbeschichtung versehen seinA guide ring is arranged between the axially adjacent sealing lips, which is formed in one piece with the support body, the guide ring is slidably engageable with the housing. When using the seal as a complete piston is advantageous in that tilting movements and Tilting related to the housing can be avoided. The elastomer The material of the two sealing lips can be in the area of Outer peripheral boundary of the support body, where the material of the two sealing lips past the inner circumference of the support body is integrally formed into one another. This is a seal of the piston on the piston rod. The supporting body, which also Guide ring includes, can consist of a suitable material or on the side facing the housing with a friction-reducing Be surface coating

Der Tragkörper kann mit zwei einen axialen Abstand voneinander aufweisenden Dichtlippen verbunden sein, wobei die Dichtlippen einstückig ineinander übergehend ausgebildet und jeweils im Bereich einer strinseitigen Begrenzung des Tragkörpers angeordnet sind. Durch die Anordnung der beiden Dichtlippen zu den beiden Druckräumen wird ein gutes Abdichtungsergebnis der gegeneinander abzudichtenden Teilräume bedingt, da dem Teilraum mit relativ höherem Druck jeweils eine Dichtlippe zugeordnet ist, die mit zunehmender Überdruckbeaufschlagung verstärkt an die in radialer Richtung angrenzende Dichtfläche des Gehäuses angedrückt wird.The support body can have an axial spacing from one another Be sealing lips connected, the sealing lips in one piece transiently formed and in each case in the area of a boundary on the strin side of the support body are arranged. By arranging the two sealing lips a good sealing result of the two pressure rooms subspaces to be sealed against each other due to the fact that the subspace is relative higher pressure is assigned a sealing lip, which with increasing Overpressurization increases to that adjacent in the radial direction Sealing surface of the housing is pressed.

Der Führungsring kann aus PTFE bestehen. Davon abweichende polymere Werkstoffe, die ebenfalls einen geringen Reibungskoeffizienten und eine gute Widerstandsfähigkeit gegen abrasiven Verschleiß aufweisen, können ebenfalls zur Anwendung gelangen.The guide ring can be made of PTFE. Different polymers Materials that also have a low coefficient of friction and a good one Can also be resistant to abrasive wear apply.

Der erfindungsgemäße Kolben mit Dichtung wird nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen zwei Ausführungsbeispiele in schematischer Darstellung.

  • In Fig. 1 ist der erfindungsgemäße Kolben mit Dichtung in einem Gehäuse gezeigt und mit Druckluft beaufschlagbar.
  • In Fig. 2 ist der Kolben aus Fig. 1 als Einzelteil dargestellt.
    • The piston with seal according to the invention is explained below with reference to the accompanying drawings. These show two exemplary embodiments in a schematic representation.
  • In Fig. 1 the piston according to the invention is shown with a seal in a housing and can be acted upon with compressed air.
  • In Fig. 2 the piston from Fig. 1 is shown as a single part.

    • In Fig. 1 ist der erfindungsgemäße Kolben mit Dichtung als Komplettkolben gezeigt, der innerhalb eines Gehäuses 6 angeordnet ist. Das Gehäuse 6 ist im Bereich seiner strinseitigen Begrenzungen jeweils mit einem Druckluftanschluß 9, 10 versehen um den Kolben 5 wechselseitig mit Druck zu beaufschlagen und in axialer Richtung hin und herzu bewegen. Zur Positionsabf rage des Kolbens 5 im Gehäuse 6 sind auf dem Gehäuse 6 Magnetfeldaufnehmer 11, 11 angeordnet, die signalleitend mit einem Anzeigegerät 12 verbunden sind. Bewegt sich der Kolben 5 unter einem der Magnetfeldaufnehmer 11, 11 hindurch, erfolgt ein entsprechendes Signal auf dem Anzeigegerät 12. Der Kolben ist auf einer in ihrem Durchmesser stufenförmig abgesetzten Kolbenstange 13 montiert, die in axialer Richtung einerseits durch das Gehäuse 6 hindurchgeführt ist.In Fig. 1 the piston according to the invention with a seal as a complete piston shown, which is arranged within a housing 6. The housing 6 is in Area of its limits on the strins side, each with a compressed air connection 9, 10 provided to alternately pressurize the piston 5 and move back and forth in the axial direction. To query the position of the piston 5 In the housing 6 there are 6 magnetic field sensors 11, 11 on the housing arranged, which are connected in a signal-conducting manner to a display device 12. The piston 5 moves under one of the magnetic field sensors 11, 11 through, there is a corresponding signal on the display device 12. Der Piston is stepped on a diameter Piston rod 13 mounted in the axial direction on the one hand through the housing 6 is passed.

    In Fig. 2 ist der Kolben 5 aus Fig. 1 als Einzelteil gezeigt. Der Kolben 5 umfaßt einen Tragkörper 1, der in diesem Ausführungsbeispiel aus PTFE besteht. Der Tragkörper 1 umschließt den Permanentmagnet 2 vollständig und ist im Bereich seines Außenumfanges als Führungsring 7 ausgebildet. Der Außendurchmesser des Führungsringes 7 ist im unmontierten Zustand kleiner, als der Außendurchmesser der beiden Dichtlippen 3.1, 3.2 im herstellungsbedingten Zustand, so daß diese im eingebauten Zustand mit einer radialen Vorspannung die Innenwandung des Gehäuses 6 dichtend berühren. Die Dichtlippen 3.1, 3.2 sind in axialer Richtung beiderseits dem Tragkörper 1 benachbart zugeordnet und einstückig ineinander übergehend ausgebildet. Um eine zuverlässige Abdichtung zu gewährleisten, ist der elastomere Werkstoff der Dichtlippen 3.1, 3.2 auch am Innenumfang des Tragkörpers 1 vorbeigeführt, in dem Bereich, in dem dieser auf einer Kolbenstange 13 abgestützt ist. Der gesamte Komplettkolben ist einstückig ausgebildet. Der Tragkörper 1 und der Permanentmagnet 2 sind miteinander verbunden, wobei der Permanentmagnet 2 vom Tragkörper 1 umfangsseitig vollständig umschlossen ist. Der Tragkörper 1 ist seinerseits adhäsiv mit der Dichtlippe 3 verbunden.2, the piston 5 from FIG. 1 is shown as an individual part. The piston 5 comprises a support body 1, which consists of PTFE in this embodiment. The Support body 1 completely surrounds the permanent magnet 2 and is in the area formed on its outer circumference as a guide ring 7. The Outside diameter of the guide ring 7 is smaller in the unassembled state, than the outer diameter of the two sealing lips 3.1, 3.2 in manufacturing-related condition, so that this in the installed state with a radial prestress touch the inner wall of the housing 6 sealingly. The sealing lips 3.1, 3.2 are on both sides of the support body 1 in the axial direction assigned adjacent and integrally formed into one another. Around Ensuring a reliable seal is the elastomeric material Sealing lips 3.1, 3.2 also guided past the inner circumference of the supporting body 1, in the area in which it is supported on a piston rod 13. The entire piston is made in one piece. The support body 1 and the Permanent magnet 2 are connected to each other, the permanent magnet 2 is completely surrounded by the supporting body 1 on the circumference. The supporting body 1 is in turn adhesively connected to the sealing lip 3.

    Claims (3)

    1. A piston (5) with a seal driven by a fluid medium, comprising a supporting body (1) made of nonmagnetizable material, which at least partially surrounds an annular permanent magnet (2) arranged on that side of the supporting body (1) which faces the housing (6) and is connected to at least one sealing lip (3) made of elastomeric material, the sealing lip (3) projecting radially beyond the supporting body (1) at the outside and being capable of being brought into sealing engagement with the inner wall (4) of a housing which surrounds the piston, the supporting body (1) being of a one-piece design and being connected to the permanent magnet (2), and a guide ring (7) being arranged between the axially adjacent sealing lips (3.1, 3.2), the said guide ring being capable of being brought in a sliding manner into engagement with the housing (6) characterized in that the supporting body (1) completely surrounds the permanent magnet (2) and in that the guide ring (7) and the supporting body (1) are of a one-piece design.
    2. A piston according to claim 1, characterized in that the supporting body (1) is connected to sealing lips (3.1, 3.2) at an axial distance from one another and in that the sealing lips (3.1, 3.2) are designed so as to merge integrally into one another and are in each case arranged in the region of an end boundary of the supporting body (1).
    3. A piston according to claim 1 or 2, characterized in that supporting body (1) and the guide ring (7) are composed of PTFE.
    EP94103900A 1993-06-23 1994-03-14 Piston with a sealing Expired - Lifetime EP0631057B2 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE4320840 1993-06-23
    DE4320840A DE4320840C1 (en) 1993-06-23 1993-06-23 Seal for a pneumatically driven piston

    Publications (3)

    Publication Number Publication Date
    EP0631057A1 EP0631057A1 (en) 1994-12-28
    EP0631057B1 EP0631057B1 (en) 1997-08-20
    EP0631057B2 true EP0631057B2 (en) 2000-11-29

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP94103900A Expired - Lifetime EP0631057B2 (en) 1993-06-23 1994-03-14 Piston with a sealing

    Country Status (4)

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    EP (1) EP0631057B2 (en)
    AT (1) ATE157144T1 (en)
    DE (2) DE4320840C1 (en)
    ES (1) ES2107069T5 (en)

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    GB9708815D0 (en) 1997-05-01 1997-06-25 Zeneca Ltd Process for making particulate compositions
    DE19925083A1 (en) * 1999-06-01 2000-12-14 Festo Ag & Co Piston for a working cylinder and process for its manufacture
    JP3467213B2 (en) * 1999-07-12 2003-11-17 Ｓｍｃ株式会社 Pilot operated switching valve with position detection function
    JP3468454B2 (en) * 1999-07-12 2003-11-17 Ｓｍｃ株式会社 Switching valve with position detection function
    DE19959664A1 (en) 1999-12-10 2001-06-13 Bayerische Motoren Werke Ag Method and device for determining the relative position of two vehicle parts
    DE10238402A1 (en) * 2002-08-22 2004-03-04 Zf Sachs Ag Piston-cylinder unit
    DE102006006677A1 (en) * 2006-02-14 2007-08-23 Parker Hannifin Gmbh & Co. Kg Magnetic piston for pneumatic cylinders
    EP2107256A1 (en) 2008-03-31 2009-10-07 Carl Freudenberg KG Pneumatic cylinder with cushioned end stroke
    EP2256381A1 (en) 2009-05-27 2010-12-01 Carl Freudenberg KG Piston and its use
    WO2012052485A1 (en) 2010-10-22 2012-04-26 Seal-Mart Engineered Plastics Kg Piston for a pneumatic system

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    EP0351317A1 (en) † 1988-07-13 1990-01-17 Automax Improved actuator

    Also Published As

    Publication number Publication date
    ES2107069T5 (en) 2001-02-16
    EP0631057B1 (en) 1997-08-20
    DE4320840C1 (en) 1994-12-15
    ATE157144T1 (en) 1997-09-15
    EP0631057A1 (en) 1994-12-28
    DE59403770D1 (en) 1997-09-25
    ES2107069T3 (en) 1997-11-16

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