EP1103728B1 - Limit switch for pneumatic or hydraulic power cylinder with end-position locking - Google Patents

Limit switch for pneumatic or hydraulic power cylinder with end-position locking Download PDF

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Publication number
EP1103728B1
EP1103728B1 EP00111722A EP00111722A EP1103728B1 EP 1103728 B1 EP1103728 B1 EP 1103728B1 EP 00111722 A EP00111722 A EP 00111722A EP 00111722 A EP00111722 A EP 00111722A EP 1103728 B1 EP1103728 B1 EP 1103728B1
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EP
European Patent Office
Prior art keywords
locking
end position
piston
contact
working cylinder
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
EP00111722A
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German (de)
French (fr)
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EP1103728A2 (en
EP1103728A3 (en
Inventor
Josef Büter
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Buemach Engineering International BV
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Buemach Engineering International BV
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Publication of EP1103728A3 publication Critical patent/EP1103728A3/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
    • F15B15/26—Locking mechanisms
    • F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions
    • 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
    • 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
    • F15B15/2892—Means for indicating the position, e.g. end of stroke characterised by the attachment means

Definitions

  • the invention refers to a transmitter for pneumatic or hydraulic working cylinder with end position locking, after locking in the respective end position responds.
  • a limit switch for working cylinders for non-contact scanning the position of a piston in a working cylinder is described in the document DE 29 16 500 C2, the a permanent magnet arranged in the housing and Hall generator has, wherein the permanent magnet arranged so is that the field lines transverse to the direction of a ferromagnetic piston and pass through baffles limited to more accurately detect the position of the piston.
  • This and other non-contact donors are to an exact position assignment too inaccurate, as they have a switching range, a certain Switch point is not reproducible, which is position-dependent Follow-up leads to problems.
  • Durckschrift US-A-3177780 shows a limit position sensor according to The preamble of claim 1. From the document US-A-4140045 is a working cylinder with respect to the cylinder housing electrically insulated contact pins, the act together with the piston as a final position known.
  • the object of the invention is to provide a Sensors for pneumatic or hydraulic working cylinders with end-position locking, after locking in the respective end position responds, within the working cylinder arranged with reproducible switching point, independent of temperature, pressure independent, robust and easy and cost-effective to implement
  • the essence of the invention consists in the formation of a, from an electrically isolated from the cylinder in this arranged contact pin and a locking piston Endlagenverriegelungsä existing as a closer encoder for pneumatically or hydraulically-acting working cylinder with Endlagenverriegelung, after locking in the final position an electrically conductive connection produces the potential of the working cylinder by the locking piston is limited beyond the necessary position for the actual locking position.
  • the advantages of the invention are in particular in closing the contact after the lock in the respective End position, so that misdirections to the actual End position are excluded.
  • the arrangement of contacts inside the working cylinder are not influenced from the outside, non-disruptive and reproducible switching points given, the temperature independent, pressure independent, maintenance-free, robust and simple and inexpensive to realize are.
  • Due to the modular arrangement on the working cylinder piston is the optional assembly for the required Endlagensignalgabe in one of the end positions as well as for both End positions possible.
  • Fig. 1 and Fig. 3 in particular a according to the principle of the known from the utility model DE 298 09 717.6 solution for Endlagenverriegelung hydraulic working cylinder acting cylinder essentially of a fixed to a piston rod 1 piston 2 in a cylinder tube 3 with a guide closure part 4 and a bottom closure part 5, wherein the piston 2, two mechanically acting modular units 6 for Endlagenverriegelung symmetrically to the main axis of the piston 2, preferably by screwing, according to Fig. 2 of a locking piston 7, a locking piston spring 8, a locking element carrier 9 and segmented blocking bodies 10th as locking elements whose hardness is lower to avoid damage to the inner wall of the cylinder tube 3, exist.
  • the segmented locking body 10 are moved accordingly to a position that they by means of the displacing by the bias of the locking piston spring 8 locking piston 7 due to its different diameter with conical transition Slidably inserted on the surface thereof in a recess 11 inserted in both the guide closure part 4 and in the bottom closure part 5, which has a chamfer 12 in the direction of movement of the piston 2 for easier unlocking, whereby a positive axial load-bearing detent, locking is effected.
  • the recess 11 is arranged in the guide closure part 4 and in the bottom closure member 5 so that the segmented locking body 10 with its inner surface 13 completely Edinburghlagern on a larger lateral surface 14 of the locking piston 7, which still has sufficient stroke to contact further in his move one in a screw housing 15 with an insulating bushing 16 electrically isolated both in the guide closure part 4 and in the bottom closure member 5 arranged contact pin 17 to produce electrically conductive.
  • the contact pin 17 is disposed in the vicinity of the recess 11 so that the contact between the locking piston 7 and the contact pin 17 is made only when the locking is done by means of the segmented locking body 10, but without the locking piston 7 its end position on assigned end stop 18 has already reached.
  • H G H K + H F
  • H F can be in a range of 2 to 4 millimeters, so that a reliable contact between the contact pin 17 and the locking piston 7 is ensured.
  • the evaluation of the contact produced can be done in a known manner, for example, at any point of the differential working cylinder, a ground connection 19 is made to a voltage source 20, wherein in the further connection of the voltage source 20 to the outer terminals of the contact pins 17 is a load 21 whose flowing Current or voltage drop is used with closed contact between the contact pin 17 and the locking piston 7 to ground for evaluation or signaling.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

Fitted in a motion locking part (4) and/or a bottom locking part, an electrically insulated contact pin (17) opposite to a working cylinder is designed as a closer in contact with a locking piston (7) in a modular unit (6) for locking end of travel.

Description

Die Erfindung bezeichnet einen Geber für pneumatisch oder hydraulisch wirkende Arbeitszylinder mit Endlagenverriegelung, der nach der Verriegelung in der jeweiligen Endlage anspricht.The invention refers to a transmitter for pneumatic or hydraulic working cylinder with end position locking, after locking in the respective end position responds.

Aus dem Stand der Technik sind Geber zur Signalisierung und Auswertung der Endlagen von Arbeitszylindern in Form von zusätzlichen Einrichtungen bekannt, die auf dem Schließen von Kontakten basieren. Die Kontaktbetätigung kann abhängig oder unabhängig vom Druck des Fluids bzw. auch am Getriebe mechanisch angesteuert erfolgen. Des Weiteren sind berührungslos wirkende Signalgeber bekannt, die insbesondere das Prinzip der Auswertung von Magnetfeldänderungen beinhalten.From the prior art encoders for signaling and Evaluation of the end positions of working cylinders in the form of additional facilities known on the closing based on contacts. The contact operation may be dependent or regardless of the pressure of the fluid or on the transmission done mechanically controlled. Furthermore, they are contactless acting signal generator known, in particular the Principle of the evaluation of magnetic field changes.

Ein Endschalter für Arbeitszylinder zur berührungslosen Abtastung der Stellung eines Kolbens in einem Arbeitszylinder wird in der Druckschrift DE 29 16 500 C2 beschrieben, der einen im Gehäuse angeordneten Permanentmagneten und Hallgenerator aufweist, wobei der Permanentmagnet so angeordnet ist, daß die Feldlinien quer zur Bewegungsrichtung eines ferromagnetischen Kolbens verlaufen und durch Leitbleche begrenzt werden, um die Position des Kolbens genauer zu erfassen. Dieser und auch andere berührungslos arbeitende Geber sind hinsichtlich einer exakten Stellungszuordnung zu ungenau, da sie einen Schaltbereich aufweisen, ein bestimmter Schaltpunkt nicht reproduzierbar ist, was bei stellungsabhängigen Folgeschaltungen zu Problemen führt.A limit switch for working cylinders for non-contact scanning the position of a piston in a working cylinder is described in the document DE 29 16 500 C2, the a permanent magnet arranged in the housing and Hall generator has, wherein the permanent magnet arranged so is that the field lines transverse to the direction of a ferromagnetic piston and pass through baffles limited to more accurately detect the position of the piston. This and other non-contact donors are to an exact position assignment too inaccurate, as they have a switching range, a certain Switch point is not reproducible, which is position-dependent Follow-up leads to problems.

In der Druckschrift DE 33 02 255 A1 wird eine Vorrichtung für die Anzeige der Endstellung eines Kolbens in einem Zylinder offenbart, bei der in der zum Arbeitszylinder führenden Hydraulikleitung ein Meßzylinder mit einem Meßkolben und elektrischen Kontakten angeordnet ist, die bei dessen Endlage, die dem Erreichen der Endlage des Arbeitszylinders entspricht, geschlossen werden. Diese Lösung ist durch den komplizierten zusätzlichen Meßzylinder, der exakt dem jeweilig benutzten Arbeitszylinder anzupassen ist, aufwendig und kostenintensiv. Durch die unterschiedlichen Einbauorte können zudem durch Temperaturdifferenzen Fehlanzeigen auftreten.In the document DE 33 02 255 A1 discloses a device for indicating the end position of a piston in a cylinder disclosed in which leading to the working cylinder Hydraulic line a graduated cylinder with a volumetric flask and electrical contacts arranged at the End position, the reaching of the end position of the working cylinder corresponds to be closed. This solution is by the complicated additional measuring cylinder, which exactly the respective used working cylinder is to adapt, consuming and costly. Due to the different installation locations In addition, due to temperature differences, false readings can occur.

Die Durckschrift US-A-3177780 zeigt einen Endlagengeber gemäß dem Oberbegriff des Patentanspruchs 1. Aus der Druckschrift US-A-4140045 ist ein Arbeitszylinder mit gegenüber dem Zylindergehäuse elektrisch isolierten Kontaktstiften, die zusammen mit dem kolben als Endlagengeber fungieren, bekannt.Durckschrift US-A-3177780 shows a limit position sensor according to The preamble of claim 1. From the document US-A-4140045 is a working cylinder with respect to the cylinder housing electrically insulated contact pins, the act together with the piston as a final position known.

Die Aufgabe der Erfindung besteht in der Ausbildung eines Gebers für pneumatisch oder hydraulisch wirkende Arbeitszylinder mit Endlagenverriegelung, der nach der Verriegelung in der jeweiligen Endlage anspricht, innerhalb des Arbeitszylinders mit reproduzierbarem Schaltpunkt angeordnet, temperaturunabhängig, druckunabhängig, robust sowie einfach und kostengünstig zu realisieren istThe object of the invention is to provide a Sensors for pneumatic or hydraulic working cylinders with end-position locking, after locking in the respective end position responds, within the working cylinder arranged with reproducible switching point, independent of temperature, pressure independent, robust and easy and cost-effective to implement

Die Aufgabe wird durch die im Patentanspruch 1 aufgeführten Merkmale gelöst. Bevorzugte Weiterbildungen ergeben sich aus den Unteransprüchen.The object is achieved by those listed in claim 1 Characteristics solved. Preferred developments emerge from the dependent claims.

Das Wesen der Erfindung besteht in der Ausbildung eines, aus einem elektrisch isoliert gegenüber dem Arbeitszylinder in diesem angeordneten Kontaktstift und einem Verriegelungskolben einer Endlagenverriegelungseinheit als Schließer bestehenden Gebers für pneumatisch oder hydraulisch wirkende Arbeitszylinder mit Endlagenverriegelung, der nach der Verriegelung in der Endlage eine elektrisch leitende Verbindung zum Potential des Arbeitszylinders herstellt, indem der Verriegelungskolben über die zur eigentlichen Verriegelung notwendige Lage hinaus begrenzt verschiebbar ist.
In einem Arbeitszylinder mit Endlagenverriegelung für beide Endstellungen ist die Anordnung jeweils eines Gebers für die zugeordnete Endlage möglich, wobei am Arbeitszylinderkolben beidseitig, symmetrisch zur vertikalen Hauptachse des Kolbens mittels einer lösbaren Verbindung eine verriegelungsfähige Modulareinheit mit einem über die zur Verriegelung notwendige Stellung begrenzt hinaus verschiebbaren Verriegelungskolben montiert werden.The essence of the invention consists in the formation of a, from an electrically isolated from the cylinder in this arranged contact pin and a locking piston Endlagenverriegelungseinheit existing as a closer encoder for pneumatically or hydraulically-acting working cylinder with Endlagenverriegelung, after locking in the final position an electrically conductive connection produces the potential of the working cylinder by the locking piston is limited beyond the necessary position for the actual locking position.
In a cylinder with Endlagenverriegelung for both end positions, the arrangement of a respective encoder for the associated end position is possible, wherein the working cylinder piston on both sides, symmetrically to the vertical main axis of the piston by means of a releasable connection lockable Modulareinheit with a limited beyond the position required for locking out locking piston to be assembled.

Die Vorteile der Erfindung bestehen insbesondere im Schließen des Kontakts nach der erfolgten Verriegelung in der jeweiligen Endlage, so dass Fehlweisungen zur tatsächlichen Endlage ausgeschlossen sind. Mit der Anordnung der Kontakte innerhalb des Arbeitszylinders sind von außen nicht beeinflußbare, nicht störbare und reproduzierbare Schaltpunkte gegeben, die temperaturunabhängig, druckunabhängig, wartungsfrei, robust sowie einfach und kostengünstig zu realisieren sind. Durch die modulare Anordnung am Arbeitszylinderkolben ist die wahlweise Montage für die benötigte Endlagensignalgabe in einer der Endlagen als auch für beide Endlagen möglich.The advantages of the invention are in particular in closing the contact after the lock in the respective End position, so that misdirections to the actual End position are excluded. With the arrangement of contacts inside the working cylinder are not influenced from the outside, non-disruptive and reproducible switching points given, the temperature independent, pressure independent, maintenance-free, robust and simple and inexpensive to realize are. Due to the modular arrangement on the working cylinder piston is the optional assembly for the required Endlagensignalgabe in one of the end positions as well as for both End positions possible.

Die Erfindung wird als Ausführungsbeispiel an Hand von

  • Fig. 1 als Schnitt durch einen Differentialarbeitszylinder am kolbenseitigen Ende im verriegelten Zustand
  • Fig. 2 als Schnitt einer Modulareinheit zur Detaildarstellung des geschlossenen Kontakts im Differentialarbeitszylinder nach der Endlagenverriegelung
  • Fig. 3 als Teilschnitt eines Differentialarbeitszylinders mit Anordnung von Kontakten zur Signalgabe nach der Verriegelung für beide Endlagen näher erläutert.
    • The invention will be described as an embodiment of hand
  • Fig. 1 as a section through a differential working cylinder at the piston end in the locked state
  • Fig. 2 as a section of a modular unit for detailed representation of the closed contact in the differential working cylinder after the Endlagenverriegelung
  • Fig. 3 as a partial section of a differential working cylinder with arrangement of contacts for signaling after locking for both end positions explained in more detail.

    • Nach Fig. 1 und Fig. 3 besteht insbesondere ein nach dem Prinzip der aus dem Gebrauchsmuster DE 298 09 717.6 bekannten Lösung zur Endlagenverriegelung hydraulischer Arbeitszylinder wirkender Arbeitszylinder im wesentlichen aus einem an einer Kolbenstange 1 befestigten Kolben 2 in einem Zylinderrohr 3 mit einem Führungsverschlußteil 4 sowie einem Bodenverschlußteil 5, wobei mit dem Kolben 2 zwei mechanisch wirkende Modulareinheiten 6 zur Endlagenverriegelung symmetrisch zur Hauptachse des Kolbens 2, vorzugsweise durch Verschrauben verbunden sind, die nach Fig. 2 aus einem Verriegelungskolben 7, einer Verriegelungskolbenfeder 8, einem Verriegelungselementeträger 9 sowie segmentierten Sperrkörpern 10 als Verriegelungselemente, deren Härte zur Vermeidung der Schädigung der Innenwandung des Zylinderrohres 3 demgegenüber geringer ist, bestehen.
    Wird der Kolben 2 durch Beaufschlagung mit einem Druckmedium in eine der Endlagen im Arbeitszylinder bewegt, so werden die segmentierten Sperrkörper 10 entsprechend in eine Position verschoben, daß sie mittels des sich durch die Vorspannung der Verriegelungskolbenfeder 8 verschiebenden Verriegelungskolbens 7 infolge dessen unterschiedlichen Durchmessers mit konischem Übergang auf dessen Oberfläche gleitend in eine sowohl im Führungsverschlußteil 4 als auch im Bodenverschlußteil 5 eingebrachte Aussparung 11, die zur leichteren Entriegelung eine Fase 12 in Bewegungsrichtung des Kolbens 2 aufweist, gedrückt werden, wodurch eine formschlüssige axiale lasttragende Rastung, Verriegelung bewirkt wird.
    Die Aussparung 11 ist im Führungsverschlußteil 4 und im Bodenverschlußteil 5 so angeordnet, daß die segmentierten Sperrkörper 10 mit ihrer inneren Oberfläche 13 vollständig auf einer größeren Mantelfläche 14 des Verriegelungskolbens 7 auflagern, wobei dieser noch ausreichend Hub aufweist, um bei seinem weiteren Verschieben den Kontakt zu einem in einem Schraubgehäuse 15 mit einer Isolierbuchse 16 elektrisch isoliert sowohl im Führungsverschlußteil 4 als auch im Bodenverschlußteil 5 angeordneten Kontaktstift 17 elektrisch leitend herzustellen. Vorzugsweise wird der Kontaktstift 17 in der Nähe der Aussparung 11 so angeordnet, daß der Kontakt zwischen dem Verriegelungskolben 7 und dem Kontaktstift 17 erst hergestellt wird, wenn die Verriegelung mit Hilfe der segmentierten Sperrkörper 10 erfolgt ist, jedoch ohne dass der Verriegelungskolben 7 seine Endlage am zugeordneten Endanschlag 18 bereits erreicht hat. Zur sicheren Funktionsweise des Kontaktes kann der Kontaktstift 17 optional teleskopisch federnd oder auch der für den Kontakt erforderliche Bereich des Verriegelungskolbens 7 elastisch verformbar ausgeführt sein.
    Der Gesamthub des Verriegelungskolbens 7 ist demzufolge größer zu wählen als der zur Schließung des Kontakt notwendige Hub. Der Gesamthub HG ergibt sich aus der Summe des erforderlichen Hubes zum Schließen des Kontakts HK und dem freien Hub bis zum Erreichen des Endanschlags 18 HF nach Herstellung des Kontakts. HG = HK + HF In einem praktischen Ausführungsbeispiel kann HF in einem Bereich von 2 bis 4 Millimetern liegen, so dass eine sichere Kontaktgabe zwischen dem Kontaktstift 17 und dem Verriegelungskolben 7 gewährleistet ist.
    Die Auswertung des hergestellten Kontaktes kann in bekannter Weise erfolgen, indem beispielsweise an beliebiger Stelle des Differentialarbeitszylinders eine Masseverbindung 19 zu einer Spannungsquelle 20 hergestellt wird, wobei in der weiteren Verbindung der Spannungsquelle 20 zu den äußeren Anschlüssen der Kontaktstifte 17 eine Last 21 liegt, deren fließender Strom oder Spannungsabfall bei geschlossenem Kontakt zwischen dem Kontaktstift 17 und dem Verriegelungskolben 7 zur Masse zur Auswertung oder Signalisierung benutzt wird.     According to Fig. 1 and Fig. 3, in particular a according to the principle of the known from the utility model DE 298 09 717.6 solution for Endlagenverriegelung hydraulic working cylinder acting cylinder essentially of a fixed to a piston rod 1 piston 2 in a cylinder tube 3 with a guide closure part 4 and a bottom closure part 5, wherein the piston 2, two mechanically acting modular units 6 for Endlagenverriegelung symmetrically to the main axis of the piston 2, preferably by screwing, according to Fig. 2 of a locking piston 7, a locking piston spring 8, a locking element carrier 9 and segmented blocking bodies 10th as locking elements whose hardness is lower to avoid damage to the inner wall of the cylinder tube 3, exist.
    If the piston 2 is moved by application of a pressure medium in one of the end positions in the working cylinder, the segmented locking body 10 are moved accordingly to a position that they by means of the displacing by the bias of the locking piston spring 8 locking piston 7 due to its different diameter with conical transition Slidably inserted on the surface thereof in a recess 11 inserted in both the guide closure part 4 and in the bottom closure part 5, which has a chamfer 12 in the direction of movement of the piston 2 for easier unlocking, whereby a positive axial load-bearing detent, locking is effected.
    The recess 11 is arranged in the guide closure part 4 and in the bottom closure member 5 so that the segmented locking body 10 with its inner surface 13 completely auflagern on a larger lateral surface 14 of the locking piston 7, which still has sufficient stroke to contact further in his move one in a screw housing 15 with an insulating bushing 16 electrically isolated both in the guide closure part 4 and in the bottom closure member 5 arranged contact pin 17 to produce electrically conductive. Preferably, the contact pin 17 is disposed in the vicinity of the recess 11 so that the contact between the locking piston 7 and the contact pin 17 is made only when the locking is done by means of the segmented locking body 10, but without the locking piston 7 its end position on assigned end stop 18 has already reached. For safe operation of the contact of the contact pin 17 may optionally be telescopically resilient or the area required for the contact area of the locking piston 7 to be designed elastically deformable.
    The total stroke of the locking piston 7 is therefore greater to choose than the necessary to close the contact stroke. The total stroke H G results from the sum of the required stroke to close the contact H K and the free stroke until reaching the end stop 18 H F after the contact has been made. H G = H K + H F In a practical embodiment, H F can be in a range of 2 to 4 millimeters, so that a reliable contact between the contact pin 17 and the locking piston 7 is ensured.
    The evaluation of the contact produced can be done in a known manner, for example, at any point of the differential working cylinder, a ground connection 19 is made to a voltage source 20, wherein in the further connection of the voltage source 20 to the outer terminals of the contact pins 17 is a load 21 whose flowing Current or voltage drop is used with closed contact between the contact pin 17 and the locking piston 7 to ground for evaluation or signaling.

    Verwendete BezugszeichenUsed reference signs

    11
    Kolbenstangepiston rod
    22
    Kolbenpiston
    33
    Zylinderrohrcylinder tube
    44
    FührungsverschlußteilGuide closure part
    55
    BodenverschlußteilBase closure part
    66
    ModulareinheitModular unit
    77
    Verriegelungskolbenlocking piston
    88th
    VerriegelungskolbenfederLocking piston spring
    99
    VerriegelungselementeträgerLocking element carrier
    1010
    segmentierte Sperrkörpersegmented blocking body
    1111
    Aussparungrecess
    1212
    Fasechamfer
    1313
    innere Oberflächeinner surface
    1414
    Mantelflächelateral surface
    1515
    Schraubgehäusescrew shell
    1616
    Isolierbuchseinsulating bush
    1717
    Kontaktstiftpin
    1818
    Endanschlagend stop
    1919
    Masseverbindungground connection
    2020
    Spannungsquellevoltage source
    2121
    Lastload

    Claims (5)

    1. End position sensor for pneumatically or hydraulically acting working cylinders with end position locking, which responds after locking in the respective end position,
      characterised in that
      in a guide closure part (4) and/or in a base closure part (5) a contact pin (17), which is electrically isolated with respect to the working cylinder, is disposed and is formed as a closer in association with a locking piston (7) of a modular unit (6) for end position locking.
    2. End position sensor as claimed in claim 1, characterised in that the electrically conductive connection is from the isolated contact pin (17) to the potential of the working cylinder after mechanical locking in the end position has been effected.
    3. End position sensor as claimed in claim 1 or 2, characterised in that the locking piston (7) acting as a closer can be displaced in a limited manner beyond the position required for the actual locking.
    4. End position sensor as claimed in any one of claims 1 to 3, characterised in that the contact pin (17) is formed in a telescopic and resilient manner.
    5. End position sensor as claimed in any one of claims 1 to 4, characterised in that the contact-closing region of the locking piston (7) is elastically deformable.
    EP00111722A 1999-11-24 2000-06-02 Limit switch for pneumatic or hydraulic power cylinder with end-position locking Expired - Lifetime EP1103728B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE29920657U DE29920657U1 (en) 1999-11-24 1999-11-24 End position transmitter for pneumatic or hydraulic working cylinders with end position locking
    DE29920657U 1999-11-24

    Publications (3)

    Publication Number Publication Date
    EP1103728A2 EP1103728A2 (en) 2001-05-30
    EP1103728A3 EP1103728A3 (en) 2003-10-15
    EP1103728B1 true EP1103728B1 (en) 2005-08-17

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    ID=8082044

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP00111722A Expired - Lifetime EP1103728B1 (en) 1999-11-24 2000-06-02 Limit switch for pneumatic or hydraulic power cylinder with end-position locking

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    EP (1) EP1103728B1 (en)
    AT (1) ATE302347T1 (en)
    DE (2) DE29920657U1 (en)

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE102022101020A1 (en) 2022-01-18 2023-07-20 Schaeffler Technologies AG & Co. KG Hydraulic system and method of operating a hydraulic system

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    US3177780A (en) * 1963-05-27 1965-04-13 Roger K Andersen Locking cylinder
    FR2170922B1 (en) 1972-02-08 1975-03-21 Messier Hispano Sa
    US4140045A (en) * 1975-11-19 1979-02-20 Fenix & Scisson, Inc. Piston positioning indicator
    US4207564A (en) 1978-06-12 1980-06-10 Midland-Ross Corporation Piston overtravel indicator
    DE2916500A1 (en) 1979-04-24 1980-11-06 Bosch Gmbh Robert Contactless end switch for piston inside cylinder - includes piston with magnet reacting with Hall generator and magnet on cylinder
    DE3302255A1 (en) 1983-01-24 1984-07-26 Paul Pleiger Maschinenfabrik, 5810 Witten Device for indicating the end position of a piston in a cylinder
    DE29809717U1 (en) 1998-05-29 1998-08-20 Bümach Engineering International B.V., Emmen End position locking of hydraulic working cylinders

    Also Published As

    Publication number Publication date
    DE29920657U1 (en) 2000-02-24
    EP1103728A2 (en) 2001-05-30
    EP1103728A3 (en) 2003-10-15
    DE50010966D1 (en) 2005-09-22
    ATE302347T1 (en) 2005-09-15

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