EP0244290A1 - Druckschalter mit zwei entgegengesetzten Schwellwerten - Google Patents

Druckschalter mit zwei entgegengesetzten Schwellwerten Download PDF

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Publication number
EP0244290A1
EP0244290A1 EP87400832A EP87400832A EP0244290A1 EP 0244290 A1 EP0244290 A1 EP 0244290A1 EP 87400832 A EP87400832 A EP 87400832A EP 87400832 A EP87400832 A EP 87400832A EP 0244290 A1 EP0244290 A1 EP 0244290A1
Authority
EP
European Patent Office
Prior art keywords
contact
insulating
conductive
cup
pressure switch
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
EP87400832A
Other languages
English (en)
French (fr)
Other versions
EP0244290B1 (de
Inventor
Yves Guillou
Christian Baux
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.)
Jaeger SA
Original Assignee
Jaeger SA
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 Jaeger SA filed Critical Jaeger SA
Publication of EP0244290A1 publication Critical patent/EP0244290A1/de
Application granted granted Critical
Publication of EP0244290B1 publication Critical patent/EP0244290B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a pressure switch, such as those allowing the monitoring of a working pressure whose variations, beyond a single predetermined, must be reported, and more particularly a pressure switch with two inverted thresholds.
  • Such devices are used to detect an abnormal drop in pressure, for example for the oil pressure of a motor vehicle oil pump, or to detect an abnormal increase in pressure, for example for enclosures containing gas at high pressure.
  • a warning light is then essential to avoid dangerous consequences created by such pressure variations beyond a predetermined threshold.
  • the qualifier "inverted" generally indicates that in the idle state, generally corresponding to a low pressure, that is to say a lower pressure at the low threshold to be detected, one of the two connection circuits associated with the thresholds to be detected is open, the other being closed, while with a two-threshold pressure switch which can be qualified as non-inverted, the two circuits are simultaneously open or closed in the idle state.
  • the device shown in the aforementioned patent comprises an insulating housing bearing contact blades, and having a cavity allows accommodate a movable insulating member supporting a first contact member, a fixed conductive cup, said cup being traversed by an insulating pusher which supports a second contact member and which is in abutment against a membrane whose other face is subjected to action of a pressure, and elastically deformable means tending to hold the contact members against their support, said contact members cooperating with said cup to open or close an electrical circuit comprising said contact tabs, as a function of the values of the pressure acting on the membrane with respect to two predetermined thresholds.
  • the structure of this device is complicated, in particular for the conductive fixed cup which is in the form of a timpani, the bottom of which is pierced with several openings, and for the contact member associated with three branches.
  • the constituent elements are arranged on either side of the bottom of the timpani, which has the consequence of complicating the structure and the operation.
  • the object of the invention is to provide a pressure switch with two inverted thresholds, allowing control and / or alert in the event of abnormal pressure variations, and which is of simple structure, and of lasting reliability and precision.
  • Another object of the invention is to produce a pressure switch which is resistant to sudden overpressures when looking at abnormal increases in pressure.
  • Another object of the invention is to have a pressure switch which can immediately replace an existing device, without complicated disassembly.
  • a pressure switch with two inverted thresholds comprising an insulating housing carrying contact tabs, and of which a cavity makes it possible to house at least one movable insulating member supporting contact members, a fixed conductive cup , said cup being traversed by a pusher which is in contact with a membrane whose other face is subjected to the action of a pressure, and elastically deformable means tending to hold the contact members against their support, said members cooperating contact with said cup for opening or closing an electrical circuit comprising said contact tabs, as a function of the values of the pressure acting on the membrane with respect to two predetermined thresholds, characterized in that it comprises a first movable insulating member, against the bottom of which a first contact member is maintained by the action of a first spring, and the central hole of which extends towards the membrane by a cylindrical appendage, a second mobile insulating member received telescopically in the first mobile insulating member, and against the bottom of which a second contact member is held by the action of
  • the first movable insulating member has tabs from its bottom for telescopic guidance of the second movable insulating member, and the first contact member has an internal cutout allowing the passage of the guide tabs, so as to be produced under an essentially flat shape; preferably, the legs of the first insulating movable member have an inclined rear face allowing the centering of the first retaining spring in cooperation with a peripheral rim of the first insulating movable member.
  • the second insulating member has internally at least one longitudinal groove corresponding to the number of fingers of the second contact member, formed in a central bore receiving the associated retaining spring.
  • the pusher can be made entirely of conductive material, but can also be of mixed structure: it then has a conductive part at the rear of its disc fixed to the membrane and on an adjacent portion of its free end, while the remaining portion said free end is insulating and ensures the centering of the second movable insulating member and of the second contact member through which it passes; in particular, the conductive portion of the free end of the pusher is a metal sleeve bearing against a central tab of the first contact member, while the remaining insulating portion of said free end passes through an associated opening of said central tab.
  • the pressure switch shown comprises an insulating housing 1 intended to be fixed, preferably by crimping, to a metal body 2 (generally hexagonal, and having a threaded end), the central bore 3 of which constitutes a pressure tapping orifice, for a liquid such as oil, the working pressure of which is shown diagrammatically by arrow 4.
  • the housing 1 has at one end, in a known manner, an open housing 5 allowing the insertion of lugs for the electrical connection with two flat contact tabs 6, 7 for a connection for the low pressure signals (low threshold ) and high pressure (high threshold) respectively.
  • the tongues 6, 7 pass through a wall 8 of the housing 1; on either side of this wall, each tongue has a conventional portion 6 ⁇ , 7 ⁇ , usual for connection from the outside of the housing with conventional connection sockets, and a portion 6 ⁇ , 7 ⁇ inside a cavity 9 of the housing in which are housed the movable contact members of the pressure switch.
  • FIG. 2 makes it possible to better distinguish the particular shape which can be adopted for the interior portions 6 ⁇ , 7 contact of the contact tabs 6, 7.
  • a conductive cup 11 is provided holding a membrane 12, the peripheral edge of which is pinched between an edge of the cup 11 and a sealing washer 13, the assembly being held by crimping maintaining the insulating housing 1 on the metal body 2 , this crimping ensuring a good seal of the assembly.
  • One face of the membrane 12 is therefore subjected to the working pressure, while the other face is in contact with a pusher 14 movable axially in response to fluctuations in the working pressure.
  • the conductive cup 11, in electrical connection with the metal body 2 has a general shape of a bowl, which ensures the maintenance of the membrane 12, avoids any pinching of the latter, whatever the position of the pusher 14 relative to the bottom of said cup.
  • the pressure switch comprises a first mobile insulating member 15, against the bottom of which is held a first contact member 16 by the action of a first spring 17, and the central hole of which extends in the direction of the membrane 12 by a cylindrical appendage 18, and a second insulating movable member 19 received telescopically in the first insulating movable member 15, and against the bottom of which is held a second contact member 20 by the action of a second spring 21 , said second contact member having at least one finger 22 passing through the bottom of the two insulating movable members 15, 19 in order to be able to contact the fixed conductive cup 11.
  • the pusher 14 whose free end slides in the cylindrical appendage 18 is conductive, and the fixed conductive cup 11 has a central hole 23 through which said cylindrical appendage passes, and serves as a bottom for the cavity 9 of the insulating housing.
  • a fundamental consequence of the structure of the pressure switch according to the invention lies in the fact that the insulating movable members 15, 19, the contact members 16, 20 and the retaining springs 17, 21 are all arranged on the same side of the conductive cup 11, which has many practical advantages, including the simplicity of structure and connection.
  • the first mobile insulating member 15 has a cup shape, the bottom 24 of which has on the one hand legs 25 (here three) for the telescopic guidance of the second mobile insulating member 19, and on the other hand openings 26 (here three) for the passage of the fingers 22 of the second contact member 20; we observe the substantially conical rear surface 27 of the legs 25, allowing the centering of the first spring 17 in cooperation with a peripheral rim 28 surrounding the bottom 24 of the movable insulating member.
  • the central hole 29 is extended on the other side of the bottom 24 by the cylindrical appendage 18 shown in FIG. 1.
  • This mobile insulating member 15 will for example be made of injected plastic, preferably glass-filled polyamide 6-6, for good resistance to hot spring pressure.
  • this contact member 16 is produced in the form of an essentially flat washer, having three successive peripheral cutouts 16 ⁇ , 16 ⁇ , 16 ′′′ giving very satisfactory operating reliability.
  • the first cut 16 ⁇ allows the passage of the guide tabs 25 of the first movable insulating member 15, while the second cut 16 ⁇ defines the central tab 30 which thus has great axial flexibility, said central tab itself being pierced (third cut 16 ′′′) For the passage of the free end of the pusher 14. Thanks to this advantageous structure, the behavior of the contact member is particularly satisfactory, and the axial flexibility obtained makes it possible to minimize any parasitic influence on the characteristic of the elastic membrane 12.
  • the second mobile insulating member 19 has a form of timpani whose bottom 30 ⁇ has, in addition to a central hole 31 for the passage of the free end of the pusher 14, three openings 32 arranged at 120 °, and extending each a longitudinal groove 33 formed over the entire height of the movable insulating member. Thanks to this structure, the second contact member 20, the shape of which is illustrated in FIG. 6, is perfectly maintained and guided: in fact, the three contact fingers 22 projecting radially from the crown 34 and folded substantially perpendicular to the plane of this crown, pass through the aforementioned openings 32, and the contact member 20 is perfectly guided by the associated grooves 33 when the latter is caused to move relative to the movable insulating member 19 against the retaining spring associated 21.
  • the mobile insulating member 19 will advantageously be made of injected plastic, in particular the same as that constituting the first mobile insulating member 15.
  • the pusher 14 is conductive so as, as will be described later, to ensure the passage of current between the fixed conductive cup 11 and the first contact member 16 through the first movable insulating member 15.
  • an entirely metallic push button for example made of silver-plated copper, the free end of which could abut against the central part of the first member contact, and ensure the passage of current when its disc comes to bear on the fixed conductive cup (in this case, the bottom 30 second of the second insulating movable member 19 would not have the central hole 31 visible in Figure 5); it is also possible to choose a pusher 14 made of insulating material, but the particular areas of which are affected by the contact are coated with a conductive material, in accordance with the embodiment illustrated in FIG.
  • bosses 38 for example three bosses at 120 °
  • bosses 38 acting as a contact stop for the conductive face 35 of the disc of the pusher 14.
  • the two connection circuits for a high pressure or low pressure signal will be opened or closed according to the respective position of the various constituent bodies: for the low pressure signal, the closed connection circuit successively comprises the conductive fixed cup 11, the second contact member 20, the associated retaining spring 21, and the contact tab 6, while for the high pressure signal, the closed connection successively comprises the conductive fixed cup 11, the conductive pusher 14 (in particular its conductive portions 35, 36), the first contact member 16, the associated retaining spring 17, and the contact tongue 7.
  • the position illustrated in Figure 1 is a rest position, occupied by the pressure switch in the absence of pressure. In this position, the high pressure connection circuit is open, while the low pressure connection circuit is closed, since the second contact member 20 is supported by its fingers 22 on the fixed conductive cup 11 due to the action of its associated retaining spring 21.
  • the nominal pressure (arrow 4) is applied, the pusher 14 is set in motion, and slides in the cylindrical appendage 18 of the first movable insulating member 15.
  • the sleeve 36 causes the second insulating movable member 19 to be raised, then the fingers 22 away from the contact member 20 relative to the fixed conductive cup 11, which has the effect of opening the connection circuit associated with the low signal pressure: thus, as soon as the first pressure threshold to be detected is reached, the two connection circuits are open.
  • connection circuit corresponding to the low pressure signal is naturally always open, but the circuit associated with the high pressure signal is then closed on contact between push-button and fixed conductive cup, the pressure detected then reaches the second threshold to be detected.
  • indicator lights indicating the closing of the high pressure and low pressure connection circuits.
  • the pressure switch of the invention has just been described in relation to pressure variations to be detected going in the upward direction; however, the pressure switch can work naturally in both directions: if one is in fact interested in pressure variations in the direction of a vacuum, the position in which the pusher is in contact with the fixed conductive cup then becomes the position at nominal pressure; if the pressure decreases, the conductive pusher leaves its support position against the fixed conductive cup, this is the first threshold, and if the pressure decreases further, the second contact member arrives in turn against said cup by its fingers connection, and this is the second threshold corresponding to Figure 1.
  • the invention is not limited to the embodiment which has just been described, and encompasses any variant incorporating with equivalent means the characteristics appearing in the claims.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Push-Button Switches (AREA)
EP87400832A 1986-04-15 1987-04-13 Druckschalter mit zwei entgegengesetzten Schwellwerten Expired - Lifetime EP0244290B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8605376A FR2597257B1 (fr) 1986-04-15 1986-04-15 Mano-contact a deux seuils inverses
FR8605376 1986-04-15

Publications (2)

Publication Number Publication Date
EP0244290A1 true EP0244290A1 (de) 1987-11-04
EP0244290B1 EP0244290B1 (de) 1991-01-23

Family

ID=9334244

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87400832A Expired - Lifetime EP0244290B1 (de) 1986-04-15 1987-04-13 Druckschalter mit zwei entgegengesetzten Schwellwerten

Country Status (6)

Country Link
US (1) US4778963A (de)
EP (1) EP0244290B1 (de)
BR (1) BR8701821A (de)
DE (1) DE3767551D1 (de)
ES (1) ES2019951B3 (de)
FR (1) FR2597257B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5198631A (en) * 1991-09-11 1993-03-30 General Electric Company Pressure responsive control device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2513313A1 (fr) * 1981-09-22 1983-03-25 Turatti Mario Transmetteur electrique de pression, utilisable pour commander des signaleurs electriques de la pression d'huile dans le circuit de lubrification de moteurs a combustion interne
FR2521341A1 (fr) * 1982-02-08 1983-08-12 Jaeger Contacteur manometrique pour vehicules automobiles et procede de realisation du support isolant des elements conducteurs pour celui-ci

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3064094A (en) * 1959-09-28 1962-11-13 American Radiator & Standard Pressure switch for washing machine tub level control
US3127586A (en) * 1962-06-01 1964-03-31 Chrysler Corp Lubrication warning signal
US3524031A (en) * 1968-05-22 1970-08-11 Sanders Associates Inc Fluid acceleration switch
GB1304085A (de) * 1970-09-01 1973-01-24
GB1368426A (en) * 1970-09-18 1974-09-25 Lucas Industries Ltd Electrical switches
GB1440756A (en) * 1972-07-26 1976-06-23 Lucas Electrical Ltd Fluid pressure operated switch
US4049935A (en) * 1974-06-11 1977-09-20 Allied Chemical Corporation Pressure switch with diaphragm
US4006083A (en) * 1975-10-09 1977-02-01 Caterpillar Tractor Co. Pressure differential switch
US4160139A (en) * 1977-08-29 1979-07-03 Bunker Ramo Corporation Pressure sensitive switch
US4214137A (en) * 1978-10-13 1980-07-22 Product Research And Development Pressure switch with snap element
US4343974A (en) * 1979-05-29 1982-08-10 Hi-Stat Manufacturing Company, Inc. Multi-circuit electrical switch
US4255630A (en) * 1979-05-29 1981-03-10 Hi-Stat Manufacturing Company, Inc. Multi-circuit electrical switch
FR2576145B1 (fr) * 1985-01-11 1987-04-03 Jaeger Mano-contact a deux seuils
US4593166A (en) * 1985-02-06 1986-06-03 Tgk Company, Limited Dual action pressure switch

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2513313A1 (fr) * 1981-09-22 1983-03-25 Turatti Mario Transmetteur electrique de pression, utilisable pour commander des signaleurs electriques de la pression d'huile dans le circuit de lubrification de moteurs a combustion interne
FR2521341A1 (fr) * 1982-02-08 1983-08-12 Jaeger Contacteur manometrique pour vehicules automobiles et procede de realisation du support isolant des elements conducteurs pour celui-ci

Also Published As

Publication number Publication date
EP0244290B1 (de) 1991-01-23
FR2597257A1 (fr) 1987-10-16
DE3767551D1 (de) 1991-02-28
FR2597257B1 (fr) 1988-08-05
BR8701821A (pt) 1988-01-26
US4778963A (en) 1988-10-18
ES2019951B3 (es) 1991-07-16

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