EP0631057B1 - Sealing for pneumatically operated piston - Google Patents
Sealing for pneumatically operated piston Download PDFInfo
- Publication number
- EP0631057B1 EP0631057B1 EP94103900A EP94103900A EP0631057B1 EP 0631057 B1 EP0631057 B1 EP 0631057B1 EP 94103900 A EP94103900 A EP 94103900A EP 94103900 A EP94103900 A EP 94103900A EP 0631057 B1 EP0631057 B1 EP 0631057B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- supporting body
- housing
- sealing
- permanent magnet
- piston
- 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
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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 seal for a piston driven by a fluid medium, comprising a support body made of non-magnetizable material, which at least partially encompasses an annular permanent magnet and is connected to at least one sealing lip made of elastomeric material, the sealing lip projecting beyond the support body in the radial direction on the outside and can be sealingly engaged with the inner wall of a housing surrounding the piston.
- Such a seal is known from Italian utility model 53974-B / 86.
- the piston which is connected to a piston rod and is arranged so as to be axially movable in the cylindrical housing, is provided with a seal to seal the subspaces of the housing which are adjacent to one another in the axial direction.
- the seal is designed as a complete piston, which consists of three components.
- the two piston halves which consist of a non-magnetic carrier material and an elastomeric sealing material, enclose a permanent magnet that is required to query the position of the piston.
- the housing is provided on its outer circumferential side with magnetic field sensors, which are connected in a signal-conducting manner to a display device. Furthermore, the housing is provided with a compressed air connection on both sides of the piston in the axial direction.
- the invention has for its object to develop a seal of the known type such that it consists of fewer parts and is easier and cheaper to manufacture.
- the support body is formed in one piece and is connected to the permanent magnet.
- the advantage here is that the entire seal, which can be designed as a complete piston, consists of only one component.
- the permanent magnet is, for example, overmoulded by the polymeric material of the support body, the support body itself being overmolded with the elastomeric material of the sealing lip. The manufacture of such a component can be carried out in one work step, which is favorable in terms of production technology and is of importance in economic terms.
- the support body can completely enclose the permanent magnet, the permanent magnet being arranged on the side of the support body facing the housing.
- the permanent magnet is to be arranged in the area of the outer circumference of the support body with a view to the best possible signal transmission. Due to the complete sheathing, the permanent magnet is protected from external influences, such as impact loads that impair functionality, and is always in a defined position in the piston.
- the supporting body can be connected to two sealing lips which are axially spaced apart, the sealing lips being integrally merging into one another and each being arranged in the region of a boundary of the supporting body on the strin side.
- the arrangement of the two sealing lips to the two pressure chambers results in a good sealing result of the partial spaces to be sealed against one another, since the partial space with a relatively higher pressure is assigned a sealing lip which is increasingly pressed against the sealing surface of the housing which adjoins in the radial direction with increasing excess pressure.
- a guide ring can be arranged between the axially adjacent sealing lips, which is formed in one piece with the supporting body, the guide ring being slidably engageable with the housing.
- the seal it is advantageous here that tilting movements and tilting in relation to the housing are avoided.
- the elastomeric material of the two sealing lips can be left free in the area of the outer circumference of the support body, the material of the two sealing lips being integrally formed past one another past the inner circumference of the support body. This results in a sealing of the piston on the piston rod.
- the support body which also includes the guide ring, can consist of a suitable material or can be provided with a friction-reducing surface coating on the side facing the housing.
- the support body can be completely enclosed by the elastomeric material of the sealing lips, the elastomeric material having a circumferentially circumferential groove that is open to the outside in the radial direction between the sealing lips adjacent to one another with axial spacing, and one that slidably engages with the housing bringable guide ring is snapped into the groove.
- the seal can alternatively be used with and without a guide ring.
- the manufacture of a seal designed in this way is particularly simple because the support body, which surrounds the permanent magnet, is completely enclosed by the elastomeric material of the sealing lips. If such a seal is to be used, for example, as a complete piston, there is the option of snapping a guide ring into the groove in order to avoid tilting during axial movements in the housing.
- the guide ring can be made of PTFE. Different polymer materials, which also have a low coefficient of friction and good resistance to abrasive wear, can also be used.
- Fig. 1 the seal according to the invention is shown in a housing and can be acted upon with compressed air.
- Fig. 2 the seal from Fig. 1 is shown as a single part.
- Fig. 3 a second embodiment of the seal is shown, in which the guide ring is snapped into a groove between the sealing lips.
- the seal according to the invention is shown as a complete piston which is arranged within a housing 6.
- the housing 6 is provided in the area of its limits on the strins side with a compressed air connection 9, 10 in order to alternately pressurize the piston 5 and to move it back and forth in the axial direction.
- magnetic field sensors 11, 11 are arranged on the housing and are connected in a signal-conducting manner to a display device 12. If the piston 5 moves under one of the magnetic field transducers 11, 11, a corresponding signal is output on the display device 12.
- the piston is mounted on a piston rod 13 with a stepped diameter, which is passed through the housing 6 on the one hand in the axial direction.
- the piston 5 from FIG. 1 is shown as an individual part.
- the piston 5 comprises a support body 1, which in this embodiment consists of PTFE.
- the support body 1 completely surrounds the permanent magnet 2 and is designed as a guide ring 7 in the region of its outer circumference.
- the outer 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 the production-related state, so that they touch the inner wall of the housing 6 in the installed state with a radial preload.
- the sealing lips 3.1, 3.2 are adjacent to the supporting body 1 on both sides in the axial direction and are integrally formed and merge.
- the elastomeric material of the sealing lips 3.1, 3.2 is also guided past the inner circumference of the support body 1, in the area in which it is supported on a piston rod 13.
- the entire complete piston is made in one piece.
- the support body 1 and the permanent magnet 2 are connected to one another, the permanent magnet 2 being completely enclosed on the circumference by the support body 1.
- the carrier body 1 is in turn adhesively connected to the sealing lip 3.
- FIG. 3 shows a second exemplary embodiment of a complete piston, the elastomeric material of the sealing lips 3.1, 3.2 surrounding the support body 1, which completely surrounds the permanent magnet 2, from the sealing material along its entire outer circumference.
- an outwardly open groove 8 is provided within the elastomeric material, into which a guide ring 7 can be snapped if necessary.
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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)
- Gasket Seals (AREA)
- Actuator (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
Die Erfindung betrifft eine Dichtung für einen von einem strömungsfähigen Medium angetriebenen Kolben, umfassend einen Tragkörper aus nicht magnetisierbarem Werkstoff, der einen ringförmigen Permanentmagnet zumindest teilweise umgreift und mit zumindest einer Dichtlippe aus elastomerem Werkstoff verbunden ist, wobei die Dichtlippe den Tragkörper in radialer Richtung außenseitig überragt und mit der Innenwandung eines den Kolben umgebenden Gehäuses dichtend in Eingriff bringbar ist.The invention relates to a seal for a piston driven by a fluid medium, comprising a support body made of non-magnetizable material, which at least partially encompasses an annular permanent magnet and is connected to at least one sealing lip made of elastomeric material, the sealing lip projecting beyond the support body in the radial direction on the outside and can be sealingly engaged with the inner wall of a housing surrounding the piston.
Eine solche Dichtung 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 des 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 seal is known from Italian utility model 53974-B / 86. The piston, which is connected to a piston rod and is arranged so as to be axially movable in the cylindrical housing, is provided with a seal to seal the subspaces of the housing which are adjacent to one another in the axial direction. The seal is designed as a complete piston, which consists of three components. The two piston halves, which consist of a non-magnetic carrier material and an elastomeric sealing material, enclose a permanent magnet that is required to query the position of the piston. The housing is provided on its outer circumferential side with magnetic field sensors, which are connected in a signal-conducting manner to a display device. Furthermore, the housing is provided with a compressed air connection on both sides of the piston in the axial direction. When designing the seal, however, it should be noted that it consists of several individual parts, which is unsatisfactory both in terms of production technology and economically.
Der Erfindung liegt die Aufgabe zugrunde, eine Dichtung der vorbekannten Art derart weiterzuentwickeln, daß sie aus weniger Einzelteilen besteht sowie einfacher und kostengünstiger herstellbar ist.The invention has for its object to develop a seal of the known type such that it consists of fewer parts and 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 characterizing feature of
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 Permanentmagnet 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. The advantage here is that the entire seal, which can be designed as a complete piston, consists of only one component. The permanent magnet is, for example, overmoulded by the polymeric material of the support body, the support body itself being overmolded with the elastomeric material of the sealing lip. The manufacture of such a component can be carried out in one work step, which is favorable in terms of production technology and is of importance in economic terms.
Nach einer ersten Ausgestaltung kann der Tragkörper den Permanentmagnet vollständig umschließen, 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.According to a first embodiment, the support body can completely enclose the permanent magnet, the permanent magnet being arranged on the side of the support body facing the housing. The permanent magnet is to be arranged in the area of the outer circumference of the support body with a view to the best possible signal transmission. Due to the complete sheathing, the permanent magnet is protected from external influences, such as impact loads that impair functionality, and is always in a defined position in the piston.
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 supporting body can be connected to two sealing lips which are axially spaced apart, the sealing lips being integrally merging into one another and each being arranged in the region of a boundary of the supporting body on the strin side. The arrangement of the two sealing lips to the two pressure chambers results in a good sealing result of the partial spaces to be sealed against one another, since the partial space with a relatively higher pressure is assigned a sealing lip which is increasingly pressed against the sealing surface of the housing which adjoins in the radial direction with increasing excess pressure.
Zwischen den axial benachbarten Dichtlippen kann ein Führungsring angeordnet sein, 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 sein.A guide ring can be arranged between the axially adjacent sealing lips, which is formed in one piece with the supporting body, the guide ring being slidably engageable with the housing. When using the seal as a complete piston, it is advantageous here that tilting movements and tilting in relation to the housing are avoided. For this purpose, the elastomeric material of the two sealing lips can be left free in the area of the outer circumference of the support body, the material of the two sealing lips being integrally formed past one another past the inner circumference of the support body. This results in a sealing of the piston on the piston rod. For this purpose, the support body, which also includes the guide ring, can consist of a suitable material or can be provided with a friction-reducing surface coating on the side facing the housing.
Nach einer davon abweichenden Ausgestaltung kann der Tragkörper vom elastomeren Werkstoff der Dichtlippen vollständig umschlossen sein, wobei der elastomere Werkstoff zwischen den einander mit axialem Abstand benachbarten Dichtlippen eine in radialer Richtung nach außen offene, umfangsseitig umlaufende Nut aufweist und wobei ein gleitend mit dem Gehäuse in Eingriff bringbarer Führungsring in die Nut eingeschnappt ist. Eine derartige Ausgestaltung ist dann von Vorteil, wenn die Dichtung alternativ mit und ohne Führungsring zur Anwendung gelangen kann. Die Herstellung einer derart ausgebildeten Dichtung ist besonders einfach möglich, da der Tragkörper, der den Permanentmagnet umschließt, vollständig vom elastomeren Werkstoff der Dichtlippen umschlossen ist. Soll eine derartige Dichtung beispielsweise als Komplettkolben zur Anwendung gelangen, besteht die Möglichkeit, einen Führungsring in die Nut einzuschnappen um eine Verkantung bei Axialbewegungen im Gehäuse zu vermeiden.According to a different configuration, the support body can be completely enclosed by the elastomeric material of the sealing lips, the elastomeric material having a circumferentially circumferential groove that is open to the outside in the radial direction between the sealing lips adjacent to one another with axial spacing, and one that slidably engages with the housing bringable guide ring is snapped into the groove. Such a configuration is advantageous if the seal can alternatively be used with and without a guide ring. The manufacture of a seal designed in this way is particularly simple because the support body, which surrounds the permanent magnet, is completely enclosed by the elastomeric material of the sealing lips. If such a seal is to be used, for example, as a complete piston, there is the option of snapping a guide ring into the groove in order to avoid tilting during axial movements in the housing.
Der Führungsring können 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 polymer materials, which also have a low coefficient of friction and good resistance to abrasive wear, can also be used.
Die erfindungsgemäße Dichtung wird nachfolgend anhand der beigefügten Zeichnungen näher erläutert. Diese zeigen zwei Ausführungsbeispiele in schematischer Darstellung.The seal according to the invention is explained in more detail below with reference to the accompanying drawings. These show two exemplary embodiments in a schematic representation.
In Fig. 1 ist die erfindungsgemäße Dichtung in einem Gehäuse gezeigt und mit Druckluft beaufschlagbar.In Fig. 1, the seal according to the invention is shown in a housing and can be acted upon with compressed air.
In Fig. 2 ist die Dichtung aus Fig. 1 als Einzelteil dargestellt.In Fig. 2 the seal from Fig. 1 is shown as a single part.
In Fig. 3 ist ein zweites Ausführungsbeispiel der Dichtung gezeigt, bei der der Führungsring in eine Nut zwischen den Dichtlippen eingeschnappt ist.In Fig. 3 a second embodiment of the seal is shown, in which the guide ring is snapped into a groove between the sealing lips.
In Fig. 1 ist die erfindungsgemäße 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 her zu bewegen. Zur Positionsabfrage 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 seal according to the invention is shown as a complete piston which is arranged within a
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
In Fig. 3 ist ein zweites Ausführungsbeispiel eines Komplettkolbens gezeigt, wobei der elastomere Werkstoff der Dichtlippen 3.1, 3.2 den Tragkörper 1, der den Permanentmagnet 2 vollständig umschließt, entlang seines gesamten Außenumfangs von dem Dichtungswerkstoff umschlossen ist. In axialer Richtung zwischen den beiden Dichtlippen 3.1, 3.2 ist eine nach außen offene Nut 8 innerhalb des elastomeren Werkstoffs vorgesehen, in den bedarfsweise ein Führungsring 7 einschnappbar ist.FIG. 3 shows a second exemplary embodiment of a complete piston, the elastomeric material of the sealing lips 3.1, 3.2 surrounding the
Claims (6)
- A seal for a piston (5) which is driven by a fluid medium, comprising a supporting body (1) made of nonmagnetizable material, which at least partially surrounds an annular permanent magnet (2) 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, characterized in that the supporting body (1) is of one-piece design and is connected to the permanent magnet (2).
- A seal according to claim 1, characterized in that the supporting body (1) completely surrounds the permanent magnet (2) and in that the permanent magnet (2) is arranged on that side of the supporting body (1) which faces the housing (6).
- A seal according to either of claims 1 and 2, characterized in that the supporting body (1) is connected to two 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).
- A seal according to any of claims 1 to 3, characterized in that a guide ring (7) is arranged between the axially adjacent sealing lips (3.1, 3.2), in that the guide ring (7) and the supporting body (1) are of one-piece design and in that the guide ring (7) can be brought in a sliding manner into engagement with the housing (6).
- A seal according to any of claims 1 to 3, characterized in that the supporting body (1) is completely surrounded by the elastomeric material of the sealing lips (3.1, 3.2), in that the elastomeric material has, between the sealing lips (3.1, 3.2) located adjacent to one another at an axial distance, a groove (8) which is open to the outside in a radial direction and runs around the circumference, and in that a guide ring (7) which can be brought in a sliding manner into engagement with the housing (6) is snapped into the groove (8).
- A seal according to any of claims 1 to 5, characterized in that ring (7) is composed of PTFE.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4320840A DE4320840C1 (en) | 1993-06-23 | 1993-06-23 | Seal for a pneumatically driven piston |
| DE4320840 | 1993-06-23 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0631057A1 EP0631057A1 (en) | 1994-12-28 |
| EP0631057B1 true EP0631057B1 (en) | 1997-08-20 |
| EP0631057B2 EP0631057B2 (en) | 2000-11-29 |
Family
ID=6491014
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)
| Country | Link |
|---|---|
| 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 |
| JP3468454B2 (en) * | 1999-07-12 | 2003-11-17 | Ｓｍｃ株式会社 | Switching valve with position detection function |
| JP3467213B2 (en) * | 1999-07-12 | 2003-11-17 | Ｓｍｃ株式会社 | Pilot operated 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7836994U1 (en) * | 1979-03-22 | Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen | Pistons for working cylinders especially operated with compressed air | |
| US3388915A (en) * | 1965-07-19 | 1968-06-18 | Gen Motors Corp | Sealing means |
| DE7635587U1 (en) † | 1976-11-11 | 1977-03-10 | Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen | Pneumatic or hydraulic piston-cylinder unit |
| NL182098C (en) * | 1977-02-05 | 1988-01-04 | Freudenberg Carl | PISTON, ESPECIALLY FOR USE IN A PNEUMATIC CYLINDER. |
| US4171818A (en) * | 1977-04-04 | 1979-10-23 | Ferrofluidics Corporation | Dynamic lip seal using ferrofluids as sealant/lubricant |
| DE2730112C2 (en) † | 1977-07-04 | 1982-04-15 | Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen | Piston arrangement, especially for dry running compressors |
| NL7908203A (en) * | 1978-12-14 | 1980-06-17 | Festo Maschf Stoll G | PISTON, ESPECIALLY FOR A PRESSURE AIR CYLINDER. |
| DE2947516C2 (en) * | 1979-11-24 | 1981-09-03 | Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen | Piston for contactless scanning of the piston position |
| DE3015258C2 (en) † | 1980-04-21 | 1987-05-07 | Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen | Inductive piston position transmitter |
| DE8209420U1 (en) * | 1982-04-02 | 1983-09-15 | Robert Bosch Gmbh, 7000 Stuttgart | PISTON FOR CONTACTLESS PISTON POSITION SENSING |
| DE3442463A1 (en) * | 1984-11-22 | 1986-05-28 | Kaco Gmbh + Co, 7100 Heilbronn | Sealing ring |
| JPS63122902A (en) * | 1986-11-13 | 1988-05-26 | Ckd Controls Ltd | Apparatus for confirming position of moving body |
| DE3644697C1 (en) * | 1986-12-30 | 1988-02-11 | Manfred Dipl-Ing Diesing | Sealing device with ferrofluid |
| FR2634256B1 (en) † | 1988-07-13 | 1992-12-31 | Automax | IMPROVED CYLINDER |
-
1993
- 1993-06-23 DE DE4320840A patent/DE4320840C1/en not_active Expired - Fee Related
-
1994
- 1994-03-14 DE DE59403770T patent/DE59403770D1/en not_active Expired - Fee Related
- 1994-03-14 AT AT94103900T patent/ATE157144T1/en not_active IP Right Cessation
- 1994-03-14 EP EP94103900A patent/EP0631057B2/en not_active Expired - Lifetime
- 1994-03-14 ES ES94103900T patent/ES2107069T5/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ES2107069T5 (en) | 2001-02-16 |
| DE4320840C1 (en) | 1994-12-15 |
| EP0631057B2 (en) | 2000-11-29 |
| DE59403770D1 (en) | 1997-09-25 |
| ES2107069T3 (en) | 1997-11-16 |
| ATE157144T1 (en) | 1997-09-15 |
| EP0631057A1 (en) | 1994-12-28 |
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