EP0082480B1 - Pressure switch - Google Patents

Pressure switch Download PDF

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Publication number
EP0082480B1
EP0082480B1 EP82111664A EP82111664A EP0082480B1 EP 0082480 B1 EP0082480 B1 EP 0082480B1 EP 82111664 A EP82111664 A EP 82111664A EP 82111664 A EP82111664 A EP 82111664A EP 0082480 B1 EP0082480 B1 EP 0082480B1
Authority
EP
European Patent Office
Prior art keywords
contact arm
housing
pressure
abutment
contacts
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
Application number
EP82111664A
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German (de)
French (fr)
Other versions
EP0082480A1 (en
Inventor
René KÄGI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elektro-Apparatebau Olten AG
Original Assignee
Elektro-Apparatebau Olten AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Elektro-Apparatebau Olten AG filed Critical Elektro-Apparatebau Olten AG
Priority to AT82111664T priority Critical patent/ATE15113T1/en
Publication of EP0082480A1 publication Critical patent/EP0082480A1/en
Application granted granted Critical
Publication of EP0082480B1 publication Critical patent/EP0082480B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/2607—Means for adjustment of "ON" or "OFF" operating pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow

Definitions

  • the pressure pad extends from the clamped end of the contact arm towards the free end of the contact arm via the guide and that the contact surface of the pressure pad facing the contact arm extends from the clamped end of the contact arm free end of the contact arm extended.
  • the largest possible area of the cushion acts against the deflectable part of the contact arm, without the latter experiencing a deflection which interferes with the switching process between the two supports.
  • the pressure switch according to the invention which is designed as a changeover switch according to FIGS. 1 and 2, can also be designed as a normally open or normally closed switch by omitting the lower normally closed contact 6 or the upper normally open contact 8. Likewise, a multiple contact arrangement can be easily implemented.
  • a pressure cushion 10 formed from a relatively thin-walled film serves as the pressure transmission element, on which the movable contact arm 3 is supported in operative connection with the greater part of its areal extension. 2 clearly shows, the pressure pad 10 is inserted between the bottom 11 of the square housing 2 and the movable contact arm 3.
  • the pressure pad 10 can be connected to a pressure medium source (not shown) via a connecting nipple 12 which penetrates the base 11.
  • the pressure medium is usually air, but can also be a hydraulic medium.
  • Essential is u. a. that the effective area of the pressure pad 10 expands from the clamped end of the contact arm 3 towards the free end of the contact arm and has an effective area of approximately approximate drop or pear-shaped shape, as shown in particular in FIG. 3.
  • the movable contact arm 3 is supported near its deflection characteristic, thus avoiding uncontrolled deflection of the contact arm during its subsequent movement as a function of the pressure increase in the pressure cushion 10, which expands approximately wedge-shaped. This results in a particularly sensitive response characteristic, which allows the pressure switch according to the invention to be used in particular in the transition region to the vacuum. Furthermore, the arrangement allows contact adhesives to be overcome without the movable contact arm 3 being able to bulge.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

1. Pressure operated switch with a housing (2; 18) on which an elastic contact arm (3; 20, 21) is fixed and whose movable part projects into the housing and comprises a contact (5) co-operating with a contact (5, 8) integral with the housing, the movable part between the fixing zone and the contacts (5, 6, 8) abutting at one side against an abutment (15, 16; 22, 23) adjustable from the outside of the housing and being acted upon from the other side, at least between the abutment and the contacts, by a pressure pad (10; 24, 25), characterised in that a guide (13) is provided which is fast with the housing and which extends along the movable part of the contact arm (3; 20, 21), and that the abutment (15, 16; 22, 23) is mounted to be displaceable in the guide (13) between the fixing zone and the contacts, without modifying the spacing between the contacts (5, 6, 8) when the abutment (15, 16; 22, 23) is displaced.

Description

Die vorliegende Erfindung bezieht sich auf einen Druckschalter gemäß dem Oberbegriff des Patentanspruches 1.The present invention relates to a pressure switch according to the preamble of claim 1.

Ein derartiger Druckschalter ist aus der FR-A-2 213 572 bekannt. Zum Verstellen des Ansprechdruckes ist darin das verstellbare Auflager als Schraube ausgebildet, die in einem gehäusefesten Muttergewinde senkrecht gegen den Kontaktarm verschiebbar ist. Diese Vorrichtung hat den Nachteil, daß es bei der Verwendung von Normgewinden schwierig ist, den Ansprechdruck fein abgestuft und reproduzierbar einzustellen. Insbesondere ist es schwierig, an der Schraube eine Marke anzuordnen und diese mit einer gehäuseseitigen Skala in Verbindung zu bringen, um eine rasche Reproduzierbarkeit des Ansprechdruckes zu erreichen.Such a pressure switch is known from FR-A-2 213 572. To adjust the response pressure, the adjustable support is designed as a screw which can be moved vertically against the contact arm in a nut thread fixed to the housing. This device has the disadvantage that when using standard threads it is difficult to set the response pressure in a graduated and reproducible manner. In particular, it is difficult to arrange a mark on the screw and to associate it with a scale on the housing side in order to achieve rapid reproducibility of the response pressure.

Das gleiche Problem zeigt sich bei der DE-C-470106, bei der die gehäuseseitige Kontaktstelle durch eine Schraube gebildet wird, welche in einem gehäusefesten Muttergewinde senkrecht gegen den Kontaktarm verstellt werden kann.The same problem is shown in DE-C-470106, in which the housing-side contact point is formed by a screw which can be adjusted vertically against the contact arm in a nut thread fixed to the housing.

Die US-A-2 602 350 offenbart, in einer gattungsfremden Vorrichtung, einen Kontaktarm als schwenkbar gelagerten, zweiarmigen Hebel auszubilden und an jedem Hebelarm eine Kraft angreifen zu lassen. Der die Kontaktstelle aufweisende Hebelarm ist unter der Wirkung der Kraft elastisch verformbar. Mit dem Hebel fest verbunden ist eine längs dem elastischen Hebelarm verlaufende Führung, längs der ein Auflager verschiebbar gelagert ist. Durch ein Verschieben des Auflagers wird die Form des zweiarmigen Hebels und damit der Ansprechbereich der Meßvorrichtung verändert. Zum Verstellen des Auflagers ist hier das Gehäuse zu öffnen, eine Arretierschraube zu lösen und das Auflager, gleich wie das Schiebegewicht einer Hebelwaage, zu verschieben. Eine Feinsteinstellung an dieser Vorrichtung dürfte mit vernünftigem Zeitaufwand kaum möglich sein, weshalb das Auflager mittels einer Stellschraube zusätzlich höhenverstellbar ausgebildet ist.US-A-2 602 350 discloses, in a non-generic device, to form a contact arm as a pivotably mounted, two-armed lever and to have a force act on each lever arm. The lever arm having the contact point is elastically deformable under the action of the force. Fixed to the lever is a guide running along the elastic lever arm, along which a support is slidably mounted. Moving the support changes the shape of the two-armed lever and thus the response range of the measuring device. To adjust the support, open the housing, loosen a locking screw and move the support, just like the sliding weight of a lever scale. A fine stone setting on this device should hardly be possible with a reasonable amount of time, which is why the support is additionally height-adjustable by means of an adjusting screw.

Den Gegenständen der vorstehend angeführten Entgegenhaltungen ist gemeinsam, daß der Abstand zwischen den Kotakten verändert werden muß, wenn der Ansprechbereich des Schalters verändert werden soll, wodurch eine flache Bauweise erschwert wird.The objects of the documents cited above have in common that the distance between the contact clocks must be changed if the response range of the switch is to be changed, which makes a flat construction difficult.

Die vorliegende Erfindung stellt sich die Aufgabe, einen Druckschalter der eingangs erwähnten Art derart zu verbessern, daß unter Wahrung einer kleinen und gewünschtenfalls auch flachen Gehäusebauweise ein genaueres Einstellen des Ansprechdruckes möglich ist.The present invention has for its object to improve a pressure switch of the type mentioned in such a way that a more precise setting of the response pressure is possible while maintaining a small and, if desired, flat housing design.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.This object is achieved by the characterizing features of claim 1.

Die Erfindung hat den Vorteil, daß auf der Gehäuseaußenseite mit einem verhältnismäßig großen Meßmarkenabstand eine fein gestufte Skala der Ansprechdrucke angebracht werden kann, welche mit einer am verschiebbaren Auflager angebrachten Marke zusammenwirkt.The invention has the advantage that a finely graduated scale of the response pressures can be attached to the outside of the housing with a relatively large measuring mark spacing, which cooperates with a mark attached to the displaceable support.

Ein weiterer Vorteil besteht darin, daß das Einstellen ausschließlich von Hand, d. h. ohne Werkzeug erfolgen kann.Another advantage is that the adjustment only by hand, i. H. can be done without tools.

Vorzugsweise ist vorgesehen, daß das Druckkissen aus zwei entlang seinen Rändern miteinander verbundenen Folien besteht und zwischen dem Boden des Schaltergehäuses und dem Kontaktarm auch im entlüfteten Zustand raumfüllend eingelegt ist. Hierdurch wird eine besonders kleinvolumige und flache Bauweise möglich, wobei die Größe des Schaltergehäuses nur gering die Länge des beweglichen Kontaktarmes und dessen Hubhöhe überschreiten muß.It is preferably provided that the pressure pad consists of two foils connected to one another along its edges and is inserted between the bottom of the switch housing and the contact arm in a space-filling manner even in the vented state. This enables a particularly small-volume and flat design, the size of the switch housing only having to exceed the length of the movable contact arm and its lifting height.

Damit der Schalter bereits bei sehr geringem Druck anspricht, wird vorgeschlagen, daß sich das Druckkissen vom eingespannten Ende des Kontaktarmes in Richtung gegen das freie Kontaktarmende über die Führung hinaus erstreckt und daß sich die dem Kontaktarm zugewandte Wirkungsfläche des Druckkissens vom eingespannten Ende des Kontaktarmes her zum freien Ende des Kontaktarmes hin erweitert. Dadurch wirkt immer eine möglichst große Fläche des Kissens gegen den auslenkbaren Teil des Kontaktarmes, ohne daß dieser zwischen den beiden Auflagern eine den Schaltvorgang beeinträchtigende Durchbiegung erfährt.So that the switch responds even at very low pressure, it is proposed that the pressure pad extends from the clamped end of the contact arm towards the free end of the contact arm via the guide and that the contact surface of the pressure pad facing the contact arm extends from the clamped end of the contact arm free end of the contact arm extended. As a result, the largest possible area of the cushion acts against the deflectable part of the contact arm, without the latter experiencing a deflection which interferes with the switching process between the two supports.

Nach einer vorteilhaften Ausbildung des erfindungsgemäßen Schalters als Druckdifferenzschalter ist der Kontaktarm nach zwei Seiten hin beweglich in seiner Mitte eingespannt, wobei seine freien Enden je einerseits unter der Wirkung des Auflagers und anderseits unter der Wirkung des Druckkissens stehen.According to an advantageous embodiment of the switch according to the invention as a differential pressure switch, the contact arm is clamped movably in the middle on two sides, its free ends each being under the action of the support and on the other hand under the action of the pressure pad.

Beispielsweise Ausführungsformen des Erfindungsgegenstandes sind nachfolgend anhand der Zeichnung näher erläutert. Es zeigt

  • Fig. 1 einen erfindungsgemäßen Druckschalter in schaubildartiger Darstellung,
  • Fig. 2 einen Druckschalter gemäß Fig. 1 im Längsschnitt,
  • Fig. 3 und 4 in Draufsicht und in Seitenansicht das Funktionsprinzip des Druckschalters gemäß den Fig. 1 und 2 und
  • Fig. 5 den erfindungsgemäßen Druckschalter in Form eines Druckdifferenzschalters.
For example, embodiments of the subject matter of the invention are explained in more detail below with reference to the drawing. It shows
  • 1 shows a pressure switch according to the invention in a diagram-like representation,
  • 2 shows a pressure switch according to FIG. 1 in longitudinal section,
  • 3 and 4 in plan view and side view of the principle of operation of the pressure switch according to FIGS. 1 and 2 and
  • Fig. 5 shows the pressure switch according to the invention in the form of a pressure differential switch.

Der in den Fig. 1 und 2 veranschaulichte Druckschalter 1 umfaßt ein längliches Vierkantgehäuse 2, in welchem sich ein beweglicher Kontaktarm 3 erstreckt, der an seinem AnschlußEnde federnd im Vierkantgehäuse 2 eingespannt ist und nach außen in eine Lötfahne 4 übergeht. Das freie Ende des Kontaktarmes 3 trägt hier den Doppelkontakt 5, der in der gezeigten Ruhelage an einem Ruhekontakt 6 mit einer gegebenen Vorspannung im Kontaktarm 3 anliegt. Dieser Ruhekontakt 6 geht nach außen in eine Lötfahne 7 über. Wird der Kontaktarm 3 angehoben, so kommt der Doppelkontakt 5 mit einem Arbeitskontakt 8 in Berührung, der nach außen in eine Lötfahne 9 übergeht.The pressure switch 1 illustrated in FIGS. 1 and 2 comprises an elongated square housing 2, in which extends a movable contact arm 3 which is resiliently clamped in the square housing 2 at its connection end and merges outwards into a soldering lug 4. The free end of the contact arm 3 here carries the double contact 5, which in the rest position shown bears against a break contact 6 with a given bias in the contact arm 3. This normally closed contact 6 merges into a solder tail 7. If the contact arm 3 is raised, the double contact 5 comes into contact with a working contact 8, which merges into a soldering lug 9 to the outside.

Schon hier ist erkennbar, daß der erfindungsgemäße Druckschalter, der gemäß Fig. 1 und 2 als Umschalter ausgeführt ist, durch Weglassen des unteren Ruhekontaktes 6 oder des oberen Arbeitskontaktes 8 auch als Arbeitskontakt - oder Ruhekontaktschalter ausgebildet sein kann. Ebenso ist eine Mehrfachkontaktanordnung ohne weiteres realisierbar.Already here it can be seen that the pressure switch according to the invention, which is designed as a changeover switch according to FIGS. 1 and 2, can also be designed as a normally open or normally closed switch by omitting the lower normally closed contact 6 or the upper normally open contact 8. Likewise, a multiple contact arrangement can be easily implemented.

Als Druckübertragungselement dient hier ein aus einer relativ dünnwandigen Folie gebildetes Druckkissen 10, auf dem sich der bewegliche Kontaktarm 3 mit dem größeren Teil seiner flächigen Ausdehnung in Wirkungsverbindung abstützt. Wie Fig. 2 deutlich zeigt, ist dabei das Druckkissen 10 zwischen dem Boden 11 des Vierkantgehäuses 2 und dem beweglichen Kontaktarm 3 eingelegt. Das Druckkissen 10 ist über einen, den Boden 11 durchdringenden Anschlußnippel 12 an eine Druckmediumquelle (nicht gezeigt) anschließbar. Das Druckmedium ist in der Regel Luft, kann aber auch ein hydraulisches Medium sein.A pressure cushion 10 formed from a relatively thin-walled film serves as the pressure transmission element, on which the movable contact arm 3 is supported in operative connection with the greater part of its areal extension. 2 clearly shows, the pressure pad 10 is inserted between the bottom 11 of the square housing 2 and the movable contact arm 3. The pressure pad 10 can be connected to a pressure medium source (not shown) via a connecting nipple 12 which penetrates the base 11. The pressure medium is usually air, but can also be a hydraulic medium.

Von wesentlicher Bedeutung ist u. a., daß sich die Wirkungsfläche des Druckkissens 10 vom eingespannten Ende des Kontaktarmes 3 her zum freien Ende des Kontaktarmes hin erweitert und eine Wirkungsfläche von etwa angenähert tropfen- oder birnenförmiger Gestalt aufweist, wie dies insbesondere Fig. 3 zeigt.Essential is u. a. that the effective area of the pressure pad 10 expands from the clamped end of the contact arm 3 towards the free end of the contact arm and has an effective area of approximately approximate drop or pear-shaped shape, as shown in particular in FIG. 3.

Wie Fig. 4 deutlich macht, erfolgt damit eine Druckunterstützung des beweglichen Kontaktarmes 3 nahe dessen Auslenkungskennlinie, womit unkontrollierte Kontaktarmausbiegungen bei dessen Folgebewegung in Abhängigkeit der Druckzunahme im Druckkissen 10, welches sich dabei etwa keilförmig ausdehnt, vermieden werden. Dies ergibt eine besonders empfindliche Ansprechcharakteristik, was erlaubt, den erfindungsgemäßen Druckschalter insbesondere auch im Übergangsbereich zum Vakuum einzusetzen. Ferner gestattet die Anordnung die Überwindung von Kontaktklebern, ohne daß dabei der bewegliche Kontaktarm 3 ausbauchen kann.4 makes it clear that the movable contact arm 3 is supported near its deflection characteristic, thus avoiding uncontrolled deflection of the contact arm during its subsequent movement as a function of the pressure increase in the pressure cushion 10, which expands approximately wedge-shaped. This results in a particularly sensitive response characteristic, which allows the pressure switch according to the invention to be used in particular in the transition region to the vacuum. Furthermore, the arrangement allows contact adhesives to be overcome without the movable contact arm 3 being able to bulge.

Zum Einstellen der Ansprechkraft des erfindungsgemäßen Druckschalters 1 durch Veränderung der freien Bewegungslänge des beweglichen Kontaktarmes 3 dient ein am Vierkantgehäuse 2 in einem Längsschlitz 13 entlang einer Einstellskala 14 verschiebbar geführter Schieber 15, der sich innenseitig über einen Druckteil 16 am beweglichen Kontaktarm 3 abstützt. Dieser Druckteil 16 kann ein gekrümmtes Federelement oder ein angelenkter Stempel oder dgl. sein.To adjust the response force of the pressure switch 1 according to the invention by changing the free movement length of the movable contact arm 3, a slide 15, which is displaceably guided on the square housing 2 in a longitudinal slot 13 along an adjustment scale 14, is supported on the inside via a pressure part 16 on the movable contact arm 3. This pressure part 16 can be a curved spring element or a hinged stamp or the like.

Aus dem Vorbeschriebenen geht hervor, daß der erfindungsgemäße Druckschalter alle vorgenannten Anforderungen zu erfüllen vermag und insbesondere robust, einfach, schaltempfindlich und von geringem Bauvolumen ist.From the above it is apparent that the pressure switch according to the invention is able to meet all of the above requirements and is in particular robust, simple, sensitive to switching and of a small construction volume.

Zudem läßt sich der erfindungsgemäße Druckschalter 1 auch zu einem sternförmigen oder linearen Mehrfachschalter zusammenbauen, wie dies in Fig. 1 angedeutet ist. Hierfür kann es zweckmäßig sein, die Einzelgehäuse der Druckschalter zum Zusammenstecken auszugestalten oder für alle Druckschalter ein gemeinsames Gehäuse vorzusehen.In addition, the pressure switch 1 according to the invention can also be assembled into a star-shaped or linear multiple switch, as indicated in FIG. 1. For this purpose, it can be expedient to design the individual housings of the pressure switches for plugging together or to provide a common housing for all pressure switches.

Weiter ist es möglich, den erfindungsgemäßen Druckschalter als Druckdifferenzschalter 17 auszubilden, wie dies Fig. 5 mehr im Einzelnen zeigt. Hierfür umfaßt der Druckdifferenzschalter 17 einen im Schaltergehäuse 18 mittig eingespannten, nach zwei Seiten hin beweglichen Kontaktarm 19, dessen freie Enden 20 und 21 je einerseits unter der Wirkung eines Schiebers 22 bzw. 23 und anderseits unter der Wirkung eines Druckkissens 24 bzw. 25 stehen.It is also possible to design the pressure switch according to the invention as a pressure differential switch 17, as shown in more detail in FIG. 5. For this purpose, the pressure differential switch 17 comprises a contact arm 19 clamped in the center of the switch housing 18 and movable on two sides, the free ends 20 and 21 of which are on the one hand under the action of a slide 22 or 23 and on the other hand under the action of a pressure pad 24 or 25.

Es ist bei dieser Anordnung natürlich möglich, die beiden Schieber 22 und 23 geeignet miteinander zu verbinden (nicht gezeigt), um eine symmetrische Ansprechempfindlichkeitsveränderung für beide Druckseiten zu erreichen.With this arrangement it is of course possible to suitably connect the two slides 22 and 23 to one another (not shown) in order to achieve a symmetrical change in sensitivity for both pressure sides.

Claims (4)

1. Pressure operated switch with a housing (2; 18) on which an elastic contact arm (3; 20, 21) is fixed and whose movable part projects into the housing and comprises a contact (5) co-operating with a contact (5, 8) integral with the housing, the movable part between the fixing zone and the contacts (5, 6, 8) abutting at one side against an abutment (15, 16; 22, 23) adjustable from the outside of the housing and being acted upon from the other side, at least between the abutment and the contacts, by a pressure pad (10; 24, 25), characterised in that a guide (13) is provided which is fast with the housing and which extends along the movable part of the contact arm (3; 20, 21), and that the abutment (15, 16; 22, 23) is mounted to be displaceable in the guide (13) between the fixing zone and the contacts, without modifying the spacing between the contacts (5, 6, 8) when the abutment (15, 16; 22, 23) is displaced.
2. Pressure operated switch according to claim 1, characterised in that the pressure pad (10; 24, 25) consists of two sheet elements connected together along their edges and is situated to fill the space between the bottom (11) of the switch housing (2; 18) and the contact arm (3; 20, 21 ) even in the air-evacuated state.
3. Pressure operated switch according to claim 1 or 2, characterised in that the pressure pad (10; 24, 25) extends from the fixed end of the contact arm (3; 20, 21) in the direction towards the free contact arm end beyond the guide (13), and that the operative surface of the pressure pad (10), which surface faces towards the contact arm, widens from the fixed end of the contact arm (3; 20, 21) to the free end of the contact arm.
4. Pressure operated switch according to claim 1, constructed as a differential pressure switch (17), characterised by a centrally fixed contact arm (19) which is movable towards two sides and whose free ends (20, 21) in each case are on the one hand under the influence of the abutment (22 or 23 respectively) and on the other hand under the influence of the pressure pad (24 or 25 respectively).
EP82111664A 1981-12-21 1982-12-15 Pressure switch Expired EP0082480B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82111664T ATE15113T1 (en) 1981-12-21 1982-12-15 PRESSURE SWITCH.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH8154/81A CH655199A5 (en) 1981-12-21 1981-12-21 PRESSURE SWITCH.
CH8154/81 1981-12-21

Publications (2)

Publication Number Publication Date
EP0082480A1 EP0082480A1 (en) 1983-06-29
EP0082480B1 true EP0082480B1 (en) 1985-08-21

Family

ID=4335996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82111664A Expired EP0082480B1 (en) 1981-12-21 1982-12-15 Pressure switch

Country Status (4)

Country Link
EP (1) EP0082480B1 (en)
AT (1) ATE15113T1 (en)
CH (1) CH655199A5 (en)
DE (1) DE3265666D1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE470106C (en) * 1927-04-29 1929-01-05 Valentin L Fey Electric horn that closes the contact with compressed air
US2602350A (en) * 1949-12-21 1952-07-08 Barber Colman Co Condition responsive instrument
FR1601303A (en) * 1968-06-17 1970-08-17
SE361975B (en) * 1972-07-18 1973-11-19 S O Jansson
DE2365188A1 (en) * 1973-01-04 1974-07-18 Steven Robert Guma DIFFERENTIAL PRESSURE TRANSDUCER
US4101747A (en) * 1976-01-30 1978-07-18 Ranco Incorporated Differential pressure operated switch
DE7726599U1 (en) * 1977-08-27 1977-12-01 Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart Electric pressure switch

Also Published As

Publication number Publication date
ATE15113T1 (en) 1985-09-15
CH655199A5 (en) 1986-03-27
EP0082480A1 (en) 1983-06-29
DE3265666D1 (en) 1985-09-26

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