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 PDFInfo
- 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
- Authority
- 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
Links
Images
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.
Landscapes
- 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
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
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.
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
If the piston 2 is moved by application of a pressure medium in one of the end positions in the working cylinder, the segmented
The recess 11 is arranged in the
The total stroke of the
The evaluation of the contact produced can be done in a known manner, for example, at any point of the differential working cylinder, a
- 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)
- 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. - 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.
- 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.
- 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.
- 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.
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 |
Family
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 |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1103728B1 (en) |
AT (1) | ATE302347T1 (en) |
DE (2) | DE29920657U1 (en) |
Families Citing this family (1)
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 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
1999
- 1999-11-24 DE DE29920657U patent/DE29920657U1/en not_active Expired - Lifetime
-
2000
- 2000-06-02 DE DE50010966T patent/DE50010966D1/en not_active Expired - Lifetime
- 2000-06-02 EP EP00111722A patent/EP1103728B1/en not_active Expired - Lifetime
- 2000-06-02 AT AT00111722T patent/ATE302347T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP1103728A3 (en) | 2003-10-15 |
DE50010966D1 (en) | 2005-09-22 |
EP1103728A2 (en) | 2001-05-30 |
DE29920657U1 (en) | 2000-02-24 |
ATE302347T1 (en) | 2005-09-15 |
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Legal Events
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---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20000602 |
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