EP0058409A2 - Pressure-operated electric switching device - Google Patents

Pressure-operated electric switching device Download PDF

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Publication number
EP0058409A2
EP0058409A2 EP82101035A EP82101035A EP0058409A2 EP 0058409 A2 EP0058409 A2 EP 0058409A2 EP 82101035 A EP82101035 A EP 82101035A EP 82101035 A EP82101035 A EP 82101035A EP 0058409 A2 EP0058409 A2 EP 0058409A2
Authority
EP
European Patent Office
Prior art keywords
housing
leaf spring
snap switch
switch
spring
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.)
Granted
Application number
EP82101035A
Other languages
German (de)
French (fr)
Other versions
EP0058409A3 (en
EP0058409B1 (en
Inventor
Jacques Cutaya
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.)
BorgWarner Transmission Systems Monaco SAM
Original Assignee
Eaton SAM
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Filing date
Publication date
Application filed by Eaton SAM filed Critical Eaton SAM
Publication of EP0058409A2 publication Critical patent/EP0058409A2/en
Publication of EP0058409A3 publication Critical patent/EP0058409A3/en
Application granted granted Critical
Publication of EP0058409B1 publication Critical patent/EP0058409B1/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
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm
    • 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
    • H01H35/2657—Details with different switches operated at substantially different pressures

Definitions

  • the invention relates to a pressure-actuated electrical switching device with a housing, on which a cover is placed with the interposition of a diaphragm which can thereby be clamped and pressurized, and in which at least one snap-action switch is arranged, the movable switch contact carrier of which is essentially parallel to the diaphragm and in the housing attached leaf spring is formed, which is actuated by a pressure piece from the membrane in the sense of a perpendicular to the membrane switching, movement, and with two, fixed in the housing, fixed contacts for each snap switch, at least one of the fixed contacts adjustable is and for adjusting the switching point of each snap switch between each leaf spring and the housing, an additional spring is supported at one end on a screw screwed into the housing.
  • Such a switching device which is actuated by a pressurized membrane, is known, such as is used, for example, to control the water level in washing machines.
  • the Known switching device contains two snap switches arranged side by side, the movable contact carrier of which is designed as a leaf spring. A pressure piece engages on the leaf springs of both snap switches, into which an extension of a plate attached to the diaphragm of the pressure-actuated switching device engages.
  • the spring hardness and thus the switching point of each snap switch can be adjusted by an additional spring acting in the direction of the switching movement of the snap switch.
  • the pressure piece When the diaphragm is pressurized, the pressure piece is moved so that the snap switches switch one after the other depending on the amount of the movement.
  • the pressure-actuated electrical switching device is characterized in that in the actuating direction of the leaf spring of at least one snap switch between its leaf spring and the housing, a safety snap switch which can be actuated by the leaf spring and has two stop faces, of which at least one of the stop faces is designed as a contact.
  • the safety snap switch is constructed from two leaf springs which run essentially parallel to one another and are each clamped at one end, one of which is bent approximately in the shape of a hook at its free end, while between the hook-shaped end of a leaf spring and the free one At the end of the other leaf spring of the safety snap switch there is an omega spring.
  • the leaf springs of the safety snap switch are fastened with their clamped ends in a metal strip which is firmly seated in the housing and is designed as a plug outside the housing.
  • the switching point or the hysteresis of the safety snap switch can be determined independently of manufacturing tolerances, it is expedient if one of the stops of the safety snap switch is designed to be adjustable.
  • a rivet can be made electrically from the leaf spring of the assigned snap switch non-conductive material that actuates the safety snap switch.
  • the external electrical circuit is simpler if one of the fixed contacts of the safety snap switch is electrically connected to the leaf spring of the associated snap switch located above it.
  • pressure-actuated electrical switching apparatus 1 includes a substantially cylindrical housing 2 with a housing base 4, on which a corresponding lid '6 is mounted, which is retained on the housing 2 by means of a flanged ring 8. Between the cover 6 and the housing 2, a soft membrane 10 is clamped on the edge, on the underside of which a plate 12 is fastened, which carries a central extension 14 pointing downward.
  • the extension 14 is in a round recess 16 of an approximately triangular pressure piece 18, which transmits the actuating force of the membrane 10 to the snap switches 20, 20b and 20c arranged on the bottom 4 of the housing 2.
  • 18 are cylindrical at each corner of the triangular pressure piece molded-on extensions 22, which have a recess 22 at their lower end, the purpose of which is described below. Furthermore, a small bracket with a triangular tip 26 is formed on the lower end of the cylindrical extension 22, which rests on the respective snap switch 20, 20b, 20c.
  • the snap switches 20, 20b, 20c of the switching device 1 are identical to one another, so that it is sufficient if the snap switch 20 is described in detail below. In order to maintain clarity, only the snap switch 20 is shown in FIG. 2 and the snap switches 20b and 20c are omitted.
  • the snap switch 20 contains a relatively narrow and flat L-shaped angled metal strip 28, the long leg of which is seated in the base 4 and forms a plug outside the housing 2.
  • a leaf spring 34 which serves as a carrier for the movable contact 32 of the snap switch 20, is fastened to the short leg 30 of the sheet metal strip 28 inside the housing 2 by riveting or spot welding.
  • the metallic leaf spring 34 has the approximately rectangular shape shown in FIG. 1 with a centrally arranged, also approximately rectangular recess 36 and carries the movable contact 32 at its front free end. Through the recess 36 q , a spring tongue 38 can swing, which is more integral Is part of the leaf spring 34 and protrudes from the narrow side of the rectangular recess 36, which is adjacent to the attachment point of the leaf spring 34.
  • the spring tongue 38 is shorter than the longitudinal dimension of the recess 36 and carries at its free end a small extension 40 which has a corresponding extension 42 on the adjacent narrow side the rectangular recess 36 is opposite.
  • the two extensions 40 and 42 serve to hold a barrel-shaped coil spring 44, which is supported at one end on the narrow side of the recess 36 and at the other end on the free end of the spring tongue 38, so that, depending on the position of the movable contact 32, the spring tongue 38 either upwards or protrudes downward from the recess 36 of the leaf spring 34.
  • two fixed contacts 50 and 52 which are spaced from one another, are arranged on associated approximately L-shaped metal angles 46 and 48, between which the movable contact 32 can move back and forth.
  • the metal bracket 46 of the lower fixed contact 50 is also fixed in the bottom 4 of the housing 2 and forms a plug outside the housing 2.
  • the metal bracket 48 of the upper fixed contact 52 is also fastened in the base 4, but its contact-carrying leg is relatively long and is extended beyond the fixed contact 52.
  • the extension 54 formed in this way rests on an adjusting screw 56 screwed into the base 4, with which the position of the fixed contact 52 can be adjusted vertically in order to set the reversing switching point of the snap switch 20.
  • the spring tongue 38 In order to set the lower switching point of the snap switch or its actuating force, at which vertically directed force on the spring tongue 38, the movable contact 32 jumps from the lower fixed contact 50 to the upper fixed contact 52, the spring tongue 38 has in its front section an opening which is not visible for reasons of illustration, through which an approximately cylindrical extension 58 of an insert piece 60 protrudes, which has a larger diameter than the opening and abuts the spring tongue 38 from below.
  • the insert 60 is in a helical spring which is supported at the other end on an adjusting screw 62 screwed into a corresponding thread in the base 4.
  • the cylindrical extension 58 of the insert 60 protrudes into the recess 24 in the cylindrical extension 22 of the pressure piece 18 and together with this serves as an anti-rotation device and thus ensures that the pressure peaks 26 each lie opposite the associated spring tongue 38 of the respective snap switch 20, 20b, 20c.
  • the membrane 10 exerts a force on the triangular pressure piece 18 via the plate 12 and the extension 14, which in turn causes this Force is transmitted via the cylindrical extensions 22 at its corners and the triangular pressure peaks 26 formed thereon to the spring tongues 38 of the individual snap switches 20, 20b, 20c.
  • the spring tongue 38 moves downward.
  • the restoring force results essentially from the inherent elasticity of the spring tongue 38, the vertically upward force component of the barrel spring 44 and the spring by virtue of the vertical 62.
  • a safety snap switch 70 Arranged underneath the snap switch 20, as shown in FIG. 2, is a safety snap switch 70 which is designed as a snap switch and which contains two metallic leaf springs 72 and 74 which run approximately parallel and in the direction of the leaf spring 34 of the snap switch 20 and which are at a distance from one another.
  • the leaf springs 72, 74 are each fixed at one end in a sheet metal strip 76, which also protrudes through the bottom 4 and is fastened there; outside the housing 2, the sheet metal strip 76 forms a plug contact.
  • the upper leaf spring 74 is approximately hook-shaped at its free end, so that the angled end thus created is approximately at a distance from the free end of the leaf spring 72 located below.
  • the respectively opposite ends of the two leaf springs 72 and 74 are connected to one another by an omega spring 76, which is hooked onto corresponding extensions with corresponding openings, which cannot be seen in the figures, and which are formed on the free ends of the leaf springs 72 and 74.
  • the lower leaf spring 72 carries in the region of its front end a movable switch contact 80 which, depending on the position of the lower leaf spring 72, either bears on a lower stop formed by an adjusting screw 82 screwed into the base 4 or on a switching contact 84 located above it.
  • the switch contact sits on a sheet metal tab 86, which is integrally formed on the short section 30 of the metal strip 28, in fact the arrangement is such that the tab 86 from an area to the side of the leaf springs 34, 72 and 74 of the snap switch 20 and the safety snap switch 70 protrudes between the leaf springs 72 and 74.
  • the snap switch 20 flips over, the leaf spring 34 pressing the movable contact 32 against the fixed contact, so that a electrically conductive connection is established from the connector formed by the metal strip 28 to the connector formed by the metal bracket 48. If, due to an error in the device to be controlled by the switching device 1, the pressure on the diaphragm 10 continues to rise, the spring tongue 38 is bent further downward. Here it finally reaches a position in which it rests against the leaf spring 74 of the safety snap switch 70.
  • the spring tongue 38 carries a corresponding small insulator 89, for example in the form of a plastic rivet, in the region of the intended contact point with the leaf spring 74. If the pressure on the membrane 10 continues to rise, after the art has been applied Stoffniets 89 to the leaf spring 74 now moves the spring tongue 38 and the leaf spring 74 downwards, whereby after a certain downward movement the hook-shaped bent end of the leaf spring 74 reaches a position in which the leaf spring 72 with the arranged thereon by the action of the omega spring 78 Movable contact 80 is pressed upwards against the fixed contact 84 located above, so that a circuit can be closed via the plug formed by the metal strip 76 and the plug formed by the metal strip 28 and in the device controlled by the switching device 1, a safety circuit, for example switching on the pump motor.
  • a safety circuit for example switching on the pump motor.
  • the actuation paths of the snap switch 20 and the safety snap switch 70 are dimensioned such that the movable contact 32 of the snap switch 20 is pressed with sufficient force against the fixed contact 52 arranged above, even when the safety snap switch 70 is switched over.
  • the pressure on the diaphragm 10 drops, causing the spring tongue 38 and the leaf spring 74 to move upward again.
  • the hook-shaped bent end of the leaf spring 74 reaches a position in which the omega spring 78 moves the leaf spring 72 down again against the adjusting screw 82 and separates the movable contact 80 from the fixed contact 84.
  • the insulating rivet 89 is then released from the safety snap switch 70, so that the switching movement and the switching points of the snap switch 20 are completely free from interference by the safety Unit snap switches 70 are. It follows from this that a change in the elastic forces acting on the snap switch 20 only occurs when the contacts 32 and 52 are already connected to one another. In normal operation, however, the snap switch 20 operates unaffected by the safety snap switch 70.
  • the adjusting screw 82 with which the switching point of the safety snap switch 70 can be set, can also be designed as an electrical contact.
  • the adjusting screw 82 is screwed up, while turning the adjusting screw 82 shifts the switching point of the safety snap switch 70 in the direction of higher pressures on the diaphragm 10.
  • such a safety snap switch 70 can be arranged under each of the three snap switches 20, 20b, 20c.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Push-Button Switches (AREA)

Abstract

1. An electrical switch device actuated by pressure, and comprising a housing (2), a cover (6) mounted on the housing and thereby securing between them the edge portion of a diaphragm (10) subjected to the pressure, at least one snap-action (20, 20b, 20c) arranged in the housing, of which switch the contact carrier is in the form of a leaf spring (34) held in the housing and extending substantially parallel to the diaphragm (10), there being a tongue (38) cut out of the surface of the leaf spring (34), the root or origin of the tongue (38) being located at the securing point of the leaf spring (34) and the free end of the tongue (38) being braced through a spring (44) to the end of the leaf spring (34) carrying the switch contact (32), whereby this tongue (38) can be moved in the course of a switching action by the diaphragm (10) through a compression member (18) in a direction perpendicular to the diaphragm, such that the tongue acts through the spring (44) to bring the switch contact (32) at the end of the leaf spring (34) into contact with either one or the other of two fixed switch contacts (50, 52) ; wherein at least one of the fixed contacts (52) is adjustable and wherein as a further provision for the adjustement of the switching point of each snap-action switch (20, 20b, 20c) there is arranged between each tongue (38) and the housing (13) an additional spring (62) with one end braced against a bolt (64) which is screwed into the housing (13), characterized in that, in the direction of actuation of the leaf spring (34) of at least one of the first-mentioned snap switches (20, 20b, 20c), and between its tongue (38) and the housing (13), there is situated a safety snap-switch (70) which is operated directly and mechanically by the tongue (38) but which is insulated from it, said safety snap-switch having two detents (82, 84) of which at least one is in the form of a contact (84).

Description

Die Erfindung betrifft eine druckbetätigte elektrische Schaltvorrichtung mit einem Gehäuse, auf dem unter Zwischenlage einer hierdurch randseitig eingespannten, druckbeaufschlagbaren Membrane ein Deckel aufgesetzt ist und in dem wenigstens ein Schnappschalter angeordnet ist, dessen beweglicher Schalterkontaktträger als im wesentlichen parallel zu der Membrane verlaufende und in dem Gehäuse befestigte Blattfeder ausgebildet ist, die über ein Druckstück von der Membrane im Sinne einer senkrecht zu der Membrane verlaufenden Schalt- , bewegung betätigbar ist,und mit jeweils zwei,in dem Gehäuse befestigten,feststehenden Kontakten für jeden Schnappschalter, wobei wenigstens einer der feststehenden Kontakte einstellbar ist und zur Verstellung des Schaltpunktes jedes Schnappschalters zwischen jeder Blattfeder und dem Gehäuse eine sich einenends auf einer in dem Gehäuse eingeschraubten Schraube abstützende Zusatzfeder angeordnet ist.The invention relates to a pressure-actuated electrical switching device with a housing, on which a cover is placed with the interposition of a diaphragm which can thereby be clamped and pressurized, and in which at least one snap-action switch is arranged, the movable switch contact carrier of which is essentially parallel to the diaphragm and in the housing attached leaf spring is formed, which is actuated by a pressure piece from the membrane in the sense of a perpendicular to the membrane switching, movement, and with two, fixed in the housing, fixed contacts for each snap switch, at least one of the fixed contacts adjustable is and for adjusting the switching point of each snap switch between each leaf spring and the housing, an additional spring is supported at one end on a screw screwed into the housing.

Aus der DE-OS 2 325 303 ist eine derartige, durch eine druckbeaufschlagte Membrane betätigende Schaltvorrichtung bekannt, wie sie beispielsweise zur Steuerung des Wasserstandes in Waschmaschinen verwendet wird. Die bekannte Schaltvorrichtung enthält in einem Gehäuse zwei nebeneinander angeordnete Schnappschalter, deren beweglicher Kontaktträger als Blattfeder ausgebildet ist. An den Blattfedern beider Schnappschalter greift ein Druckstück ein, in das seinerseits ein Fortsatz eines an der Membrane der druckbetätigten Schaltvorrichtung befestigten Tellers eingreift. Die Federhärte und damit der Schaltpunkt jedes Schnappschalters ist durch eine zusätzliche in Richtung der Schaltbewegung des Schnappschalters wirkende Zusatzfeder einstellbar.From DE-OS 2 325 303 such a switching device, which is actuated by a pressurized membrane, is known, such as is used, for example, to control the water level in washing machines. The Known switching device contains two snap switches arranged side by side, the movable contact carrier of which is designed as a leaf spring. A pressure piece engages on the leaf springs of both snap switches, into which an extension of a plate attached to the diaphragm of the pressure-actuated switching device engages. The spring hardness and thus the switching point of each snap switch can be adjusted by an additional spring acting in the direction of the switching movement of the snap switch.

Bei Druckbeaufschlagung der Membrane wird das Druckstück verschoben, so daß je nach Betrag der Verschiebebewegung, die Schnappschalter nacheinander umschalten.When the diaphragm is pressurized, the pressure piece is moved so that the snap switches switch one after the other depending on the amount of the movement.

Wenn mit dieser bekannten Schaltvorrichtung zwei unterschiedliche Wasserstandsfüllhöhen einer Waschmaschine gesteuert werden, ist es nicht mehr möglich, an die Schaltvorrichtung eine Sicherungsvorrichtung anzuschließen, ... so daß beim Überschreiten eines bestimmten oberen Wasserstandes im Betrieb der Waschmaschine eine Sicherheitsfunktion ausgelöst wird.If with this known switching device two different water levels of a washing machine are controlled, it is no longer possible to connect a safety device to the switching device, ... so that a safety function is triggered when a certain upper water level is exceeded during operation of the washing machine.

.Aufgabe der Erfindung ist es deshalb, die eingangs genannte druckbetätigte elektrische Schaltvorrichtung derart weiterzubilden, daß mit ihr beim Überschreiten eines vorgegebenen oberen Steuerdrucks eine Sicherheitsfunktion auslösbar ist.It is therefore the task of the invention to develop the pressure-operated electrical switching device mentioned at the outset in such a way that a safety function can be triggered when it exceeds a predetermined upper control pressure.

Zur Lösung dieser Aufgabe ist die erfindungsgemäße druckbetätigte elektrische Schaltvorrichtung dadurch gekennzeichnet, daß in Betätigungsrichtung der Blattfeder wenigstens eines Schnappschalters zwischen dessen Blattfeder und dem Gehäuse ein von der Blattfeder betätigbarer Sicherheitsschnappschalter mit zwei Anschlagflächen sitzt, von denen wenigstens eine der Anschlagflächen als Kontakt ausgebildet ist.To achieve this object, the pressure-actuated electrical switching device according to the invention is characterized in that in the actuating direction of the leaf spring of at least one snap switch between its leaf spring and the housing, a safety snap switch which can be actuated by the leaf spring and has two stop faces, of which at least one of the stop faces is designed as a contact.

Hierdurch ergibt sich der Vorteil, daß durch den zusätzlichen Sicherheitsschnappschalter die Grundfläche des Gehäuses nicht vergrößert wird. Außerdem besteht zwischen dem Sicherheitsschnappschalter und dem zugehörigen für die normale Steuerung verwendeten Schnappschalter eine Zwangskopplung, die dafür sorgt, daß immer zunächst der Schnappschalter für die normale Steuerung umspringt, ehe der Sicherheitsschnappschalter anspricht.This has the advantage that the base area of the housing is not enlarged by the additional safety snap switch. In addition, there is a positive coupling between the safety snap switch and the associated snap switch used for normal control, which ensures that the snap switch for normal control always jumps before the safety snap switch responds.

Eine sehr einfache Konstruktion der Schaltvorrichtung ergibt sich, wenn der Sicherheitsschnappschalter aus zwei im wesentlichen parallel zueinander verlaufenden und jeweils einenends eingespannten Blattfedern aufgebaut ist, von denen eine an ihrem freien Ende etwa hakenförmig gebogen ist, während zwischen dem hakenförmigen Ende der einen Blattfeder und dem freien Ende der anderen Blattfeder des Sicherheitsschnappschalters eine Omegafeder sitzt. Eine weitere Vereinfachung ergibt sich, wenn die Blattfedern des Sicherheitsschnappschalters mit ihren eingespannten Enden in einem Metallstreifen befestigt sind, der fest in dem Gehäuse sitzt und außerhalb des Gehäuses als Stecker ausgebildet ist.A very simple construction of the switching device is obtained if the safety snap switch is constructed from two leaf springs which run essentially parallel to one another and are each clamped at one end, one of which is bent approximately in the shape of a hook at its free end, while between the hook-shaped end of a leaf spring and the free one At the end of the other leaf spring of the safety snap switch there is an omega spring. A further simplification results if the leaf springs of the safety snap switch are fastened with their clamped ends in a metal strip which is firmly seated in the housing and is designed as a plug outside the housing.

Damit der Schaltpunkt bzw. die Hysterese des Sicherheitsschnappschalters unabhängig von Fertigungstoleranzen festgelegt werden kann, ist es zweckmäßig, wenn einer der Anschläge des Sicherheitsschnappschalters einstellbar ausgebildet ist.So that the switching point or the hysteresis of the safety snap switch can be determined independently of manufacturing tolerances, it is expedient if one of the stops of the safety snap switch is designed to be adjustable.

Damit nicht beim Anlegen der Blattfeder des zugeordneten Schnappschalters für die normale Steuerung an den Sicherheitsschnappschalter vorzeitig ein elektrischer Stromkreis geschlossen wird, kann in der Blattfeder des zugeordneten Schnappschalters ein Niet aus einem elektrisch nicht leitenden Material sitzen, durch den der Sicherheitsschnappschalter betätigt wird.So that an electrical circuit is not closed prematurely when the leaf spring of the assigned snap switch for the normal control is connected to the safety snap switch, a rivet can be made electrically from the leaf spring of the assigned snap switch non-conductive material that actuates the safety snap switch.

Die äußere elektrische Beschaltung gestaltet sich einfacher, wenn einer der feststehenden Kontakte des Sicherheitsschnappschalters elektrisch mit der Blattfeder des darüber befindlichen zugeordneten Schnappschalters verbunden ist.The external electrical circuit is simpler if one of the fixed contacts of the safety snap switch is electrically connected to the leaf spring of the associated snap switch located above it.

In der Zeichnung ist ein Ausführungsbeispiel des Gegenstandes der Erfindung dargestellt. Es zeigen

  • Figur 1 eine druckbetätigte elektrische Schaltvorrichtung gemäß der Erfindung mit drei in dessen geöffnetem Gehäuse angeordneten Schnappschaltern in einer Draufsicht und Figur 2 die druckbetätigte elektrische Schaltvorrichtung nach Figur 1 mit entlang der Linie II-II nach Figur 1 aufgeschnittenem Gehäuse in einem anderen Maßstab und in einer Seitenansicht.
In the drawing, an embodiment of the object of the invention is shown. Show it
  • 1 shows a pressure-operated electrical switching device according to the invention with three snap switches arranged in its open housing in a plan view and FIG. 2 shows the pressure-operated electrical switching device according to FIG. 1 with the housing cut along the line II-II according to FIG. 1 in a different scale and in a side view .

Die in den Fig. 1 und 2 veranschaulichte druckbetätigte elektrische Schaltvorrichtung 1 enthält ein im wesentlichen zylinderförmiges Gehäuse 2 mit einem Gehäuseboden 4, auf das ein entsprechender Deckel'6 aufgesetzt ist, der mittels eines umgebördelten Ringes 8 auf dem Gehäuse 2 festgehalten ist. Zwischen dem Deckel 6 und dem Gehäuse 2 ist eine weiche Membrane 10 randseitig eingespannt, an deren Unterseite ein Teller 12 befestigt ist, der einen zentralen nach unten weisenden Fortsatz 14 trägt. Der Fortsatz 14 steckt in einer runden Ausnehmung 16 eines etwa dreieckförmigen Druckstücks 18, das die Betätigungskraft der Membrane 10 auf die auf dem Boden 4 des Gehäuses 2 angeordneten Schnappschalter 20, 20b und 20c überträgt. Hierzu sind an jeder Ecke des dreieckförmigen Druckstücks 18 zylindrische,nach unten weisende Fortsätze 22 angeformt, die an ihrem unteren Ende eine Ausnehmung 22 aufweisen, deren Zweck unten beschrieben ist. Ferner ist an dem unteren Ende des zylindrischen Fortsatzes 22 ein kleiner Ausleger mit einer dreieckförmigen Spitze 26 angeformt, die auf dem jeweiligen Schnappschalter 20, 20b, 20c aufliegt.The illustrated in FIGS. 1 and 2, pressure-actuated electrical switching apparatus 1 includes a substantially cylindrical housing 2 with a housing base 4, on which a corresponding lid '6 is mounted, which is retained on the housing 2 by means of a flanged ring 8. Between the cover 6 and the housing 2, a soft membrane 10 is clamped on the edge, on the underside of which a plate 12 is fastened, which carries a central extension 14 pointing downward. The extension 14 is in a round recess 16 of an approximately triangular pressure piece 18, which transmits the actuating force of the membrane 10 to the snap switches 20, 20b and 20c arranged on the bottom 4 of the housing 2. For this purpose, 18 are cylindrical at each corner of the triangular pressure piece molded-on extensions 22, which have a recess 22 at their lower end, the purpose of which is described below. Furthermore, a small bracket with a triangular tip 26 is formed on the lower end of the cylindrical extension 22, which rests on the respective snap switch 20, 20b, 20c.

Die Schnappschalter 20, 20b, 20c der Schaltvorrichtung 1 sind untereinander gleich, so daß es ausreicht, wenn im folgenden der Schnappschalter 20 im einzelnen beschrieben ist. Um die übersichtlichkeit zu wahren, ist deshalb in der Fig. 2 lediglich der Schnappschalter 20 dargestellt und die Schnappschalter 20b und 20c sind weggelassen.The snap switches 20, 20b, 20c of the switching device 1 are identical to one another, so that it is sufficient if the snap switch 20 is described in detail below. In order to maintain clarity, only the snap switch 20 is shown in FIG. 2 and the snap switches 20b and 20c are omitted.

Der Schnappschalter 20 enthält einen relativ schmalen und flachen L-förmig abgewinkelten Metallstreifen 28, dessen langer Schenkel in dem Boden 4 sitzt und außerhalb des Gehäuses 2 einen Stecker bildet. An dem kurzen innerhalb des Gehäuses 2 liegenden Schenkel 30 des Blechstreifens 28 ist eine als Träger für den beweglichen Kontakt 32 des Schnappschalters 20 dienende Blattfeder 34 durch Nieten oder Punktschweißen befestigt. Die metallische Blattfeder-34 weist die aus Fig. 1 ersichtliche etwa rechteckförmige Gestalt mit mittig angeordneter, ebenfalls etwa rechteckförmiger Ausnehmung 36 auf und trägt an ihrem vorderen freien Ende den beweglichen Kontakt 32. Durch die Ausnehmung 36qkann eine Federzunge 38 schwingen, die einstückiger Bestandteil der Blattfeder 34 ist und aus der Schmalseite der rechteckförmigen Ausnehmung 36 hervorsteht, die der Befestigungsstelle der Blattfeder 34 benachbart ist. Die Federzunge 38 ist kürzer als die Längsabmessung der Ausnehmung 36 und trägt an ihrem freien Ende einen kleinen Fortsatz 40, der einem entsprechenden Fortsatz 42 an der benachbarten Schmalseite der rechteckförmigen Ausnehmung 36 gegenüberliegt. Die beiden Fortsätze 40 und 42 dienen zum Halten einer tonnenförmigen Schraubenfeder 44, die sich einenends auf der Schmalseite der Ausnehmung 36 und anderenends auf dem freien Ende der Federzunge 38 abstützt, so daß je nach Lage des beweglichen Kontaktes 32 die Federzunge 38 wahlweise nach oben oder nach unten aus der Ausnehmung 36 der Blattfeder 34 hervorsteht.The snap switch 20 contains a relatively narrow and flat L-shaped angled metal strip 28, the long leg of which is seated in the base 4 and forms a plug outside the housing 2. A leaf spring 34, which serves as a carrier for the movable contact 32 of the snap switch 20, is fastened to the short leg 30 of the sheet metal strip 28 inside the housing 2 by riveting or spot welding. The metallic leaf spring 34 has the approximately rectangular shape shown in FIG. 1 with a centrally arranged, also approximately rectangular recess 36 and carries the movable contact 32 at its front free end. Through the recess 36 q , a spring tongue 38 can swing, which is more integral Is part of the leaf spring 34 and protrudes from the narrow side of the rectangular recess 36, which is adjacent to the attachment point of the leaf spring 34. The spring tongue 38 is shorter than the longitudinal dimension of the recess 36 and carries at its free end a small extension 40 which has a corresponding extension 42 on the adjacent narrow side the rectangular recess 36 is opposite. The two extensions 40 and 42 serve to hold a barrel-shaped coil spring 44, which is supported at one end on the narrow side of the recess 36 and at the other end on the free end of the spring tongue 38, so that, depending on the position of the movable contact 32, the spring tongue 38 either upwards or protrudes downward from the recess 36 of the leaf spring 34.

Gegenüber dem beweglichen Kontakt 32 sind auf zugehörigen ungefähr L-förmigen Metallwinkeln 46 und 48 zwei im Abstand zueinander befindliche feststehende Kontakte 50 und 52 angeordnet, zwischen denen sich der bewegliche Kontakt 32 hin- und herbewegen kann. Der Metallwinkel 46 des unteren feststehenden Kontaktes 50 ist ebenfalls in dem Boden 4 des Gehäuses 2 befestigt und bildet außerhalb des Gehäuses 2 einen Stecker. Auch der Metallwinkel 48 des oberen feststehenden Kontaktes 52 ist in dem Boden 4 befestigt, jedoch ist sein kontakttragender Schenkel relativ lang ausgebildet und über den festen Kontakt 52 hinaus verlängert. Die so gebildete Verlängerung 54 liegt auf einer in den Boden 4 eingeschraubten Einstellschraube 56 auf, mit der zur Einstellung des Umkehrschaltpunktes des Schnappschalters 20 die Lage des feststehenden Kontaktes 52 vertikal einstellbar ist. Hierzu besteht zwischen der Einstellschraube 56 und dem Metallwinkel 48 eine kraftschlüssige Verbindung, die von dessen Eigenelastizität herrührt, so daß die Verlängerung 54 mit relativ großer Kraft auf der Einstellschraube 56 aufliegt, damit die Lage des feststehenden Kontaktes 52 nicht durch den Kontaktdruck des beweglichen Kontaktes 32 verstellt wird.Opposite the movable contact 32, two fixed contacts 50 and 52, which are spaced from one another, are arranged on associated approximately L-shaped metal angles 46 and 48, between which the movable contact 32 can move back and forth. The metal bracket 46 of the lower fixed contact 50 is also fixed in the bottom 4 of the housing 2 and forms a plug outside the housing 2. The metal bracket 48 of the upper fixed contact 52 is also fastened in the base 4, but its contact-carrying leg is relatively long and is extended beyond the fixed contact 52. The extension 54 formed in this way rests on an adjusting screw 56 screwed into the base 4, with which the position of the fixed contact 52 can be adjusted vertically in order to set the reversing switching point of the snap switch 20. For this purpose, there is a non-positive connection between the adjusting screw 56 and the metal bracket 48, which results from its inherent elasticity, so that the extension 54 rests on the adjusting screw 56 with a relatively large force, so that the position of the fixed contact 52 is not affected by the contact pressure of the movable contact 32 is adjusted.

Um den unteren Schaltpunkt des Schnappschalters bzw. dessen Betätigungskraft einzustellen, bei der bei einer senkrecht gerichteten Kraft auf die Federzunge 38 der bewegliche Kontakt 32 von dem unteren feststehenden Kontakt 50 auf den oberen feststehenden Kontakt 52 umspringt, weist die Federzunge 38 in ihrem vorderen Abschnitt eine aus Darstellungsgründen nicht sichtbare Öffnung auf, durch die ein ungefähr zylindrischer Fortsatz 58 eines Einsatzstückes 60 hindurchragt, das einen größeren Durchmesser als die Öffnung aufweist und von unten an der Federzunge 38 anliegt. Das Einsatzstück 60 steckt in einer Schraubenfeder, die sich anderenends auf einer in ein entsprechendes Gewinde in dem Boden 4 eingeschraubten Einstellschraube 62 abstützt. Der zylindrische Fortsatz 58 des Einsatzstückes 60 ragt in die Ausnehmung 24 in dem zylindrischen Fortsatz 22 des Druckstückes 18 und dient zusammen mit dieser als Verdrehsicherung und gewährleistet somit, daß die Druckspitzen 26 jeweils gegenüber der zugeordneten Federzunge 38 des jeweiligen Schnappschalters20, 20b, 20c liegen.In order to set the lower switching point of the snap switch or its actuating force, at which vertically directed force on the spring tongue 38, the movable contact 32 jumps from the lower fixed contact 50 to the upper fixed contact 52, the spring tongue 38 has in its front section an opening which is not visible for reasons of illustration, through which an approximately cylindrical extension 58 of an insert piece 60 protrudes, which has a larger diameter than the opening and abuts the spring tongue 38 from below. The insert 60 is in a helical spring which is supported at the other end on an adjusting screw 62 screwed into a corresponding thread in the base 4. The cylindrical extension 58 of the insert 60 protrudes into the recess 24 in the cylindrical extension 22 of the pressure piece 18 and together with this serves as an anti-rotation device and thus ensures that the pressure peaks 26 each lie opposite the associated spring tongue 38 of the respective snap switch 20, 20b, 20c.

Wenn das Volumen zwischen der Membrane 10 und dem Deckel 6 beispielsweise über den an dem Deckel 6 angeformten Schlauchanschluß 66 mit Druck beaufschlagt wird, übt die Membrane 10 über den Teller 12 und den Fortsatz 14 eine Kraft auf das dreieckförmige Druckstück 18 aus, das seinerseits diese Kraft über die zylindrischen Fortsätze 22 an seinen Ecken und die daran angeformten dreieckförmigen Druckspitzen 26 auf die Federzungen 38 der einzelnen Schnappschalter 20, 20b, 20c weiterleitet. Wenn die von der Membrane 10 über die einzelnen Glieder weitergeleitete Kraft an einer Federzunge 38 deren Rückstellkraft übersteigt, bewegt sich die Federzunge 38 nach unten. Die Rückstellkraft ergibt sich hierbei im wesentlichen aus der Eigenelastizität der Federzunge 38, der vertikal nach oben wirkenden Kraftkomponente der Tonnenfeder 44 sowie der Federkraft der vertikal nach oben wirkenden Einstellfeder 62. Sobald die Federzunge 38 eine bestimmte Lage erreicht hat, springt unter der Wirkung der Tonnenfeder 44 die Blattfeder 34 um und preßt den beweglichen Kon- takt 32 an den oberen feststehenden Kontakt 52. Nach Absinken des Drucks in dem Volumen zwischen der Membrane 10 und dem Deckel 6 kehrt sich die Bewegung der Blattfeder 34 und der Federzunge 38 um, so daß beim Überschreiten einer bestimmten Lage der Federzunge 38 der bewegliche Kontakt 32 durch die Blattfeder und die Tonnenfeder 34 wieder auf den unteren feststehenden Kontakt 50 gepreßt wird.If the volume between the membrane 10 and the cover 6 is pressurized, for example via the hose connection 66 formed on the cover 6, the membrane 10 exerts a force on the triangular pressure piece 18 via the plate 12 and the extension 14, which in turn causes this Force is transmitted via the cylindrical extensions 22 at its corners and the triangular pressure peaks 26 formed thereon to the spring tongues 38 of the individual snap switches 20, 20b, 20c. When the force transmitted by the membrane 10 via the individual members on a spring tongue 38 exceeds its restoring force, the spring tongue 38 moves downward. The restoring force results essentially from the inherent elasticity of the spring tongue 38, the vertically upward force component of the barrel spring 44 and the spring by virtue of the vertical 62. upward acting adjusting As soon as the spring tongue 38 has reached a certain position, the leaf spring 34 moves under the action of the barrel spring 44 around and presses the movable K on- clock 32 52 to the upper fixed contact After the pressure in the volume between the membrane 10 and the cover 6, the movement of the leaf spring 34 and the spring tongue 38 reverses, so that when a certain position of the spring tongue 38 is exceeded, the movable contact 32 by the leaf spring and the barrel spring 34 again on the lower fixed Contact 50 is pressed.

Unterhalb des Schnappschalters 20 ist, wie Fig. 2 zeigt, ein als Sprungschalter ausgebildeter Sicherheitschnappschalter 70 angeordnet, der zwei unterschiedlich lange etwa parallel und in Richtung der Blattfeder 34 des Schnappschalters 20 verlaufende metallische Blattfedern 72 und 74 enthält, die im Abstand zueinander übereinanderliegen. Die Blattfedern 72, 74 sind jeweils mit einem Ende in einem Blechstreifen 76 befestigt, der ebenfalls durch den Boden 4 ragt und dort befestigt ist; außerhalb des Gehäuses 2 bildet der Blechstreifen 76 einen Steckkontakt. Die obere Blattfeder 74 ist an ihrem freien Ende etwa hakenförmig gekrümmt, so daß das so entstehende abgewinkelte Ende etwa dem freien Ende der untenliegenden Blattfeder 72 im Abstand gegenübersteht. Die sich jeweils gegenüberliegenden Enden der beiden Blattfedern 72 und 74 sind durch eine Omegafeder 76 miteinander verbunden, die mit entsprechenden in den Figuren nicht erkennbaren Öffnungen auf entsprechenden Fortsätzen eingehakt ist, die an den freien Enden der Blattfedern 72 und 74 angeformt sind.Arranged underneath the snap switch 20, as shown in FIG. 2, is a safety snap switch 70 which is designed as a snap switch and which contains two metallic leaf springs 72 and 74 which run approximately parallel and in the direction of the leaf spring 34 of the snap switch 20 and which are at a distance from one another. The leaf springs 72, 74 are each fixed at one end in a sheet metal strip 76, which also protrudes through the bottom 4 and is fastened there; outside the housing 2, the sheet metal strip 76 forms a plug contact. The upper leaf spring 74 is approximately hook-shaped at its free end, so that the angled end thus created is approximately at a distance from the free end of the leaf spring 72 located below. The respectively opposite ends of the two leaf springs 72 and 74 are connected to one another by an omega spring 76, which is hooked onto corresponding extensions with corresponding openings, which cannot be seen in the figures, and which are formed on the free ends of the leaf springs 72 and 74.

Die untere Blattfeder 72 trägt im Bereich ihres vorderen Endes einen beweglichen Schalterkontakt 80, der je nach Lage der unteren Blattfeder 72 entweder auf einem unteren durch eine in den Boden 4 eingeschraubte Einstellschraube 82 gebildeten Anschlag oder an einem darüber befindlichen Schaltkontakt 84 anliegt. Der Schaltkontakt sitzt auf einer Blechlasche 86, die einstückig an den kurzen Abschnitt 30 des Metallstreifens 28 angeformt ist, und zwar ist die Anordnung derart getroffen, daß die Lasche 86 von einem Bereich seitlich der Blattfedern 34, 72 und 74 des Schnappschalters 20 und des Sicherheitsschnappschalters 70 zwischen die Blattfedern 72 und 74 hineinragt.The lower leaf spring 72 carries in the region of its front end a movable switch contact 80 which, depending on the position of the lower leaf spring 72, either bears on a lower stop formed by an adjusting screw 82 screwed into the base 4 or on a switching contact 84 located above it. The switch contact sits on a sheet metal tab 86, which is integrally formed on the short section 30 of the metal strip 28, in fact the arrangement is such that the tab 86 from an area to the side of the leaf springs 34, 72 and 74 of the snap switch 20 and the safety snap switch 70 protrudes between the leaf springs 72 and 74.

Wenn, wie oben beschrieben, durch Druckeinwirkung auf die Membrane 10 die Federzunge 38 durch die zwischengeschalteten Übertragungsglieder gegen die Rückstellkraft nach unten bewegt wird, springt der Schnappschalter 20 um, wobei die Blattfeder 34 den beweglichen Kontakt 32 an den feststehenden Kontakt anpreßt, so daß eine elektrisch leitende Verbindung von dem durch den Metallstreifen 28 gebildeten Stecker zu dem durch den Metallwinkel 48 gebildeten Stecker hergestellt wird. Wenn nun, bedingt durch einen Fehler in dem durch die Schaltvorrichtung 1 zu steuernden Gerät der auf der Membrane 10 lastende Druck weiter ansteigt, wird die Federzunge 38 weiter nach unten gebogen. Hierbei erreicht sie schließlich eine Stellung, in der sie sich an die Blattfeder 74 des Sicherheitsschnappschalters 70 anlegt. Damit bei diesem Anlegen kein Stromkreis geschlossen wird, trägt die Federzunge 38 im Bereich der beabsichtigten Berührungsstelle mit der Blattfeder 74 einen entsprechenden kleinen Isolator 89, beispielsweise in Form eines Kunststoffniets. Wenn der auf der Membran 10 lastende i Druck weiterhin steigt, werden nach Anlage des Kunststoffniets 89 an die Blattfeder 74 nunmehr die Federzunge 38 und die Blattfeder 74 gleichzeitig nach unten bewegt, wobei nach einer bestimmten Abwärtsbewegung das hakenförmig abgebogene Ende der Blattfeder 74 eine Lage erreicht, bei der durch die Wirkung der Omegafeder 78 die Blattfeder 72 mit dem darauf angeordneten beweglichen Kontakt 80 nach oben gegen den darüberliegenden feststehenden Kontakt 84 gedrückt wird, so daß sich ein Stromkreis über den durch den Metallstreifen 76 gebildeten Stecker und den durch den Metallstreifen 28 gebildeten Stecker schließen kann und in dem durch die Schaltvorrichtung 1 gesteuerten Gerät eine Sicherheitsschaltung, beispielsweise das Einschalten des Pumpenmotors, auslöst.If, as described above, the spring tongue 38 is moved downward by the intermediate transmission members against the restoring force by pressure acting on the diaphragm 10, the snap switch 20 flips over, the leaf spring 34 pressing the movable contact 32 against the fixed contact, so that a electrically conductive connection is established from the connector formed by the metal strip 28 to the connector formed by the metal bracket 48. If, due to an error in the device to be controlled by the switching device 1, the pressure on the diaphragm 10 continues to rise, the spring tongue 38 is bent further downward. Here it finally reaches a position in which it rests against the leaf spring 74 of the safety snap switch 70. So that no circuit is closed during this application, the spring tongue 38 carries a corresponding small insulator 89, for example in the form of a plastic rivet, in the region of the intended contact point with the leaf spring 74. If the pressure on the membrane 10 continues to rise, after the art has been applied Stoffniets 89 to the leaf spring 74 now moves the spring tongue 38 and the leaf spring 74 downwards, whereby after a certain downward movement the hook-shaped bent end of the leaf spring 74 reaches a position in which the leaf spring 72 with the arranged thereon by the action of the omega spring 78 Movable contact 80 is pressed upwards against the fixed contact 84 located above, so that a circuit can be closed via the plug formed by the metal strip 76 and the plug formed by the metal strip 28 and in the device controlled by the switching device 1, a safety circuit, for example switching on the pump motor.

Die Betätigungswege des Schnappschalters 20 und des Sicherheitsschnappschalters 70 sind derart bemessen, daß auch bei umgeschaltetem Sicherheitsschnappschalter 70 der bewegliche Kontakt 32 des Schnappschalters 20 mit ausreichender Kraft gegen den darüber angeordneten feststehenden Kontakt 52 angepreßt wird.The actuation paths of the snap switch 20 and the safety snap switch 70 are dimensioned such that the movable contact 32 of the snap switch 20 is pressed with sufficient force against the fixed contact 52 arranged above, even when the safety snap switch 70 is switched over.

Sobald die Fehlersituation innerhalb des von der Schaltvorrichtung 1 gesteuerten Gerätes beseitigt ist, fällt der auf der Membrane 10 lastende Druck, womit sich die Federzunge 38 und die Blattfeder 74 wieder nach oben bewegen. Hierbei erreicht das hakenförmig abgebogene Ende der Blattfeder 74 eine Lage, bei der die Omegafeder 78 die Blattfeder 72 wieder nach unten gegen die Einstellschraube 82 bewegt und den beweglichen Kontakt 80 von dem feststehenden Kontakt 84 trennt. Bei einem weiteren Druckabfall kommt dann der isolierende Niet 89 von dem Sicherheitsschnappschalter 70 frei, so daß die Schaltbewegung und die Schaltpunkte des Schnappschalters 20 völlig frei von einer Beeinflussung durch den Sicherheitsschnappschalter 70 sind. Hieraus ergibt sich, daß eine Änderung der an dem Schnappschalter 20 angreifenden elastischen Kräfte erst auftritt , wenn die Kontakte 32 und 52 bereits miteinander verbunden sind. Im Normalbetrieb jedoch arbeitet der Schnappschalter 20 unbeeinflußt durch den Sicherheitsschnappschalter 70.As soon as the fault situation within the device controlled by the switching device 1 is eliminated, the pressure on the diaphragm 10 drops, causing the spring tongue 38 and the leaf spring 74 to move upward again. Here, the hook-shaped bent end of the leaf spring 74 reaches a position in which the omega spring 78 moves the leaf spring 72 down again against the adjusting screw 82 and separates the movable contact 80 from the fixed contact 84. In the event of a further drop in pressure, the insulating rivet 89 is then released from the safety snap switch 70, so that the switching movement and the switching points of the snap switch 20 are completely free from interference by the safety Unit snap switches 70 are. It follows from this that a change in the elastic forces acting on the snap switch 20 only occurs when the contacts 32 and 52 are already connected to one another. In normal operation, however, the snap switch 20 operates unaffected by the safety snap switch 70.

Es ist ersichtlich, daß die Einstellschraube 82, mit der der Schaltpunkt des Sicherheitsschnappschalters 70 eingestellt werden kann, auch als elektrischer Kontakt ausgebildet werden kann.It can be seen that the adjusting screw 82, with which the switching point of the safety snap switch 70 can be set, can also be designed as an electrical contact.

Wenn der Sicherheitsschnappschalter 70 bereits nach einem relativ kurzen Betätigungsweg der Blattfeder 74 ansprechen soll, wird die Einstellschraube 82 nach oben geschraubt, während ein Zurückdrehen der Einstellschraube 82 den Schaltpunkt des Sicherheitsschnappschalters 70 in Richtung auf höhere Drücke an der Membrane 10 verlagert.If the safety snap switch 70 is to respond after a relatively short actuation path of the leaf spring 74, the adjusting screw 82 is screwed up, while turning the adjusting screw 82 shifts the switching point of the safety snap switch 70 in the direction of higher pressures on the diaphragm 10.

Außerdem ist ersichtlich, daß unter jedem der drei Schnappschalter 20, 20b, 20c ein derartiger Sicherheitsschnappschalter 70 angeordnet werden kann.It can also be seen that such a safety snap switch 70 can be arranged under each of the three snap switches 20, 20b, 20c.

Claims (6)

1. Druckbetätigte elektrische Schaltvorrichtung mit einem Gehäuse, auf dem unter Zwischenlage einer hierdurch randseitig eingespannten,druckbeaufschlagbaren Membrane ein Deckel aufgesetzt ist und in dem wenigstens ein Schnappschalter angeordnet ist, dessen beweglicher Schalterkontaktträger als im wesentlichen parallel zu der Membrane verlaufende und in dem Gehäuse befestigte Blattfeder ausgebildet ist, die über ein Druckstück.von der Membrane im Sinne einer senkrecht zu der Membrane verlaufenden Schaltbewegung betätigbar ist,und mit jeweils zwei, in dem Gehäuse befestigten,feststehenden Kontakten für jeden Schnappschalter, wobei wenigstens einer der feststehenden Kontakte einstellbar ist und zur Verstellung des Schaltpunktes jedes Schnappschalters zwischen jeder Blattfeder und dem Gehäuse eine sich einenends auf einer in dem Gehäuse eingeschraubten Schraube abstützende Zusatzfeder angeordnet ist, dadurch gekennzeichnet, daß in Betätigungsrichtung der Blattfeder (34) wenigstens eines Schnappschalters (20, 20b, 20c) zwischen dessen Blattfeder (34) und dem Gehäuse (2) ein von der Blattfeder (34).'betätigbarer Sicherheitsschnappschalter (70) mit zwei Anschlägen (82, 84) sitzt, von denen wenigstens einer als Kontakt (84) ausgebildet ist.1. Pressure-actuated electrical switching device with a housing, on which a cover is placed with the interposition of a diaphragm which can thereby be clamped and pressurized and in which at least one snap-action switch is arranged, the movable switch contact carrier of which is a leaf spring which runs essentially parallel to the diaphragm and is fastened in the housing is formed, which can be actuated via a thrust piece from the diaphragm in the sense of a switching movement running perpendicular to the diaphragm, and with two fixed contacts for each snap switch fastened in the housing, at least one of the fixed contacts being adjustable and for adjustment of the switching point of each snap switch between each leaf spring and the housing, an additional spring is supported at one end on a screw screwed into the housing, characterized in that in the actuating direction of the leaf spring (34) at least one Sc Snap switch (20, 20b, 20c) between its leaf spring (34) and the housing (2) is a safety snap switch (70) which can be actuated by the leaf spring (34) and has two stops (82, 84), at least one of which acts as a contact (84) is formed. 2. Schaltvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Sicherheitsschnappschalter (70) aus zwei im wesentlichen parallel zueinander verlaufenden, jeweils einenends eingespannten Blattfedern (72, 74) aufgebaut ist, von denen eine an ihrem freien Ende etwa hakenförmig gebogen ist,und daß zwischen dem hakenförmigen Ende dieser Blattfeder (74) und dem freien Ende der anderen Blattfeder (72) des Sicherheitsschnappschalters (70) eine Omegafeder (78) sitzt.2. Switching device according to claim 1, characterized in that the safety snap switch (70) from two substantially parallel, each having one end clamped leaf springs (72, 74) is constructed, one of which is bent approximately hook-shaped at its free end, and that between the hook-shaped end of this leaf spring (74) and the free end of the other leaf spring (72) of the safety snap switch (70) is an omega spring (78). 3. Schaltvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Blattfedern (72, 74) mit ihren eingespannten Enden in einem Metallstreifen (76) befestigt sind, der fest in dem Gehäuse (2) sitzt und außerhalb des Gehäuses (2) als 'Stecker ausgebildet ist.3. Switching device according to claim 2, characterized in that the leaf springs (72, 74) are fastened with their clamped ends in a metal strip (76) which is fixed in the housing (2) and outside the housing (2) as a ' plug is trained. 4. Schaltvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß wenigstens einer der Anschläge (82, 84) des Sicherheitsschnappschalters (70) einstellbar ist.4. Switching device according to claim 1, characterized in that at least one of the stops (82, 84) of the safety snap switch (70) is adjustable. 5. Schaltvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Blattfeder (34) des über dem Sicherheitsschnappschalter (70) angeordneten Schnappschalters (20) an der Eingriffsstelle mit dem Sicherheitsschnappschalter (70) einen Niet (89) aus einem elektrisch nicht leitenden Material trägt.5. Switching device according to claim 1, characterized in that the leaf spring (34) of the above the safety snap switch (70) arranged snap switch (20) at the point of engagement with the safety snap switch (70) carries a rivet (89) made of an electrically non-conductive material. 6. Schaltvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß einer der feststehenden'Kontakte (84) des Sicherheitsschnappschalters (70) elektrisch mit der Blattfeder (34) des darüber befindlichen Schnappschalters (20) verbunden ist.6. Switching device according to claim 1, characterized in that one of the fixed 'contacts (84) of the safety snap switch (70) is electrically connected to the leaf spring (34) of the snap switch (20) located above it.
EP19820101035 1981-02-12 1982-02-12 Pressure-operated electric switching device Expired EP0058409B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19818103768 DE8103768U1 (en) 1981-02-12 1981-02-12 "Pressure Operated Electrical Switching Device"
DE8103768U 1981-02-12

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EP0058409A2 true EP0058409A2 (en) 1982-08-25
EP0058409A3 EP0058409A3 (en) 1983-04-06
EP0058409B1 EP0058409B1 (en) 1985-09-11

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EP (1) EP0058409B1 (en)
AU (1) AU8043782A (en)
DE (1) DE8103768U1 (en)
ES (1) ES263186Y (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0516544A1 (en) * 1991-05-29 1992-12-02 Dav Electric switch, especially for controlling vehicle equipment and accessoires
EP0542695A2 (en) * 1991-11-15 1993-05-19 MA-TER S.r.l. Touch pressure switch including a manually operated safety microswitch
EP0542696A2 (en) * 1991-11-15 1993-05-19 MA-TER S.r.l. Pressure switch having a manually operated safety microswitch
EP3772081A1 (en) * 2019-07-31 2021-02-03 Saginomiya Seisakusho, Inc. Pressure switch

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004041403B3 (en) * 2004-08-26 2005-11-24 Elektromanufaktur Zangenstein Hanauer Gmbh & Co. Kgaa Integrated pressure dependent switch such as for pressure sensors in household appliances such as washing machines having a pressure sensing elastic element connected to one end of a lever

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1543230A (en) * 1900-01-01 Improvements to built-in safety thermal adjustment devices
FR2121794A1 (en) * 1971-01-12 1972-08-25 Danfoss As
FR2184479A2 (en) * 1972-05-18 1973-12-28 Europ Manufact Ring

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1543230A (en) * 1900-01-01 Improvements to built-in safety thermal adjustment devices
FR2121794A1 (en) * 1971-01-12 1972-08-25 Danfoss As
FR2184479A2 (en) * 1972-05-18 1973-12-28 Europ Manufact Ring

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0516544A1 (en) * 1991-05-29 1992-12-02 Dav Electric switch, especially for controlling vehicle equipment and accessoires
FR2677167A1 (en) * 1991-05-29 1992-12-04 Dav ELECTRICAL SWITCH, IN PARTICULAR FOR THE CONTROL OF AUTOMOTIVE EQUIPMENT AND ACCESSORIES.
EP0542695A2 (en) * 1991-11-15 1993-05-19 MA-TER S.r.l. Touch pressure switch including a manually operated safety microswitch
EP0542696A2 (en) * 1991-11-15 1993-05-19 MA-TER S.r.l. Pressure switch having a manually operated safety microswitch
EP0542696A3 (en) * 1991-11-15 1993-07-28 Ma-Ter S.R.L. Pressure switch having a manually operated safety microswitch
EP0542695A3 (en) * 1991-11-15 1993-07-28 Ma-Ter S.R.L. Touch pressure switch including a manually operated safety microswitch
EP3772081A1 (en) * 2019-07-31 2021-02-03 Saginomiya Seisakusho, Inc. Pressure switch

Also Published As

Publication number Publication date
EP0058409A3 (en) 1983-04-06
ES263186U (en) 1982-07-16
ES263186Y (en) 1984-03-01
AU8043782A (en) 1982-08-19
DE8103768U1 (en) 1981-09-24
EP0058409B1 (en) 1985-09-11

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