US3303306A - Membrane switch with first and second independently movable portions - Google Patents

Membrane switch with first and second independently movable portions Download PDF

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Publication number
US3303306A
US3303306A US385186A US38518664A US3303306A US 3303306 A US3303306 A US 3303306A US 385186 A US385186 A US 385186A US 38518664 A US38518664 A US 38518664A US 3303306 A US3303306 A US 3303306A
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United States
Prior art keywords
membrane
actuating
portions
fluid
movable
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US385186A
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English (en)
Inventor
Fischer Max
Brink Gerhard
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • H01H35/2614—Means for adjustment of "ON" or "OFF" operating pressure by varying the bias on the pressure sensitive element
    • 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

  • Another object of the invention is to provide a membrane switch with independently movable membrane portions which individually control correlated contact means.
  • Another object of the invention is to provide a membrane switch in which each individually movable membrane portion is directly connected by rigid actuating means to a correlated electrical contact means, so that the linkages of the prior art are avoided.
  • Another object of the invention is to provide a membrane switch with a membrane having a plurality of individually movable membrane portions which are biased to respond to different actuating pressures of a controlling fluid acting on the membrane so that contact means are successively actuated.
  • Another object of the invention is to differently bias the electrical contact means of a membrane switch, and to connect each contact means to an independently movable portion or" a membrane so that different fluid pressures cause selective actuation of the contact means.
  • the present invention relates to a membrane switch which comprises a membrane mounted on a support and including a plurality of independently movable membrane portions which are, respectively, connected to a plurality of contact means for actuating the same when the respective membrane portion is displaced.
  • a plurality of biasing means is provided for applying different forces to one side of the membrane portions, preferably through actuating means connecting a contact means with the membrane portions, so that fluid pressure applied to the membrane portions will cause actuation of the contact means whose correlated membrane portions are displaced at different pressures by the pres sure fluid.
  • One embodiment of the invention comprises a support, such as a housing which is divided by the membrane into a chamber for the fluid, and another chamber in which the contact means are mounted.
  • Each contact means includes an actuating member on which a biasing means, preferably in the form of an adjustable spring acts.
  • the actuating member is connected by actuating means to a corresponding membrane portion of the membrane,
  • two membrane portions are separated by a fold in the membrane to be individually displaceable by the fluid pressure, and a segment-shaped plate is secured to each membrane portion.
  • a circular fold in the membrane separates a circular membrane portion from an outer annular membrane portion, and one actuating means which is connected to one contact means includes a plate secured to the inner portion, while the other actuating means cooperating with the other contact means, includes a bell-shaped member whose rim is secured to the annular membrane portion.
  • actuating members of the several contact means are directly connected to individually movable membrane portions, so that no linkages are required.
  • FIG. 1 is a longitudinal axial section illustrating one embodiment of the invention
  • FIG. 2 is a cross sectional view taken on line II-II in FIG. 1;
  • FIG. 3 is a side elevation, partly in axial section, illusstrating another embodiment of the invention.
  • the housing of the membrane switch is composed of a generally pot-shaped housing part 1 consisting of an insulating material, and being closed by a cover means having a crimped edge secured to a flange of housing part 1. Between cover 2 and housing part 1, the peripheral edge portion 3 of a membrane 4 is clamped so that the interior of the housing is divided into a chamber 7 and into a chamber 8.
  • Chamber 7 has a tubular inlet means 5 secured to cover 2 and provided with a throttle opening 6. Pressure fluid can be supplied through inlet means 5 into chamber 7, and will act on one side of membrane 4 to displace the same toward chamber 8.
  • a straight fold 17 is provided in membrane 4, dividing the same into two substantially segment-shaped membrane portions which are individually movable due to the provision of fold 17. For example, when one of the segment-shaped membrane portions is prevented from movement, the pressure of the pressure fluid in chamber 7 will still be able to displace the other membrane portion.
  • Each contact means constructed as snap-over switches, are disposed in chamber 8.
  • Each contact means has a frame-shaped arm 9, carrying a contact piece 10, and adapted to move between two positions including a circuit closing position in which contact piece 10 abuts another contact piece, not shown, on housing part 1.
  • An actuating tongue member 11 projects into the cutout of contact arm 9 and is connected by a spring 12 to the opposite part of contact arm 9.
  • Housing part 1 has two projections, in which springs 13 are mounted which respectively abut the ends of actuating tongue members 11 to bias the same to move toward membrane 4-.
  • Adjusting screws 14 are mounted in threaded parts of the projections on housing part 1, and are individually adjustable for adjusting the spring tension of biasing springs 13.
  • Actuating means 18 and 19 include plates 15 and 16 which are segmentshaped, as best seen in FIG. 2, and which are respectively secured to the two membrane portions and separated by fol-d 17 in membrane 4.
  • the straight edges 15 and 16' of the segmentashaped plates 15 and 16 are disposed directly adjacent the flexible fold 17.
  • FIG. 3 corresponds substantially to the embodiment described with reference to FIGS. 1 and 2, and corresponding parts are indicated by like reference numerals.
  • the embodiment of FIG. 3 provides an inner central substantially circular membrane portion separated bya circular inwardly convex told 22 from an outer annular membrane portion.
  • the actuating means for the contact means 9 on the left side of FIG. 3 include a circular plate 21 secured to the central portion of the, membrane, and having a perpendicu larly projecting arm 24 connected to the actuating member 11 of the respective contact means 9.
  • the actuating means for the contact means on the right side of FIG. 3, include a bell-shaped member 2t) whose lower rim is secured to the annular membrane portion outside of fold 22, and whose top has an opening 24 through which projecting arm 23 of member 21 passes.
  • the central portion of the ,top of bell-shaped member 21 has a guide portion 26 with a guide bore through which a guide pin 25 secured to the plate member 21 passes.'
  • the free end of guide pin 25 is lguided in a guide means 27 provided on housing part 1.
  • Bell-shaped member 20 has a projection 29 on its top connected to actuating member 11 so that the pressure of spring 13 on The other V 4'. the right side of FIG. 3 is transmitted to the bell-shaped member 2% and from there to the outer annular membrane portion.
  • Guide members 25, 2d and 27' which are parallel to projection 29 and projecting arm 23, assure a parallel movement of members 20 and 21, and the centering of member 20 relative to member 21. In the embodiment of PEG.
  • a lesser pressure of the fluid in chamber 7 will be sufiicient to displace the annular membrane portion and to shift actuating means 20, 26 so that contact means 9 on the right side of FIG. 3 is first actuated.
  • the pressure of the fluid is increased, it is sufficient to displace the central membrane portion with member 21 so that contact means 9 on the left side is actuated.
  • a membrane switch comprising, in combination, a support; membrane means mounted on said support and including a first movable membrane portion, a second movable membrane portion, and means intermediate said first and second movable membrane portions and including a poition of said membrane means and permitting said movable membrane portions to move substantially independently of each other; a plurality of contact means mounted on said support, each contact means including an actuating member movable between two positions; biasing means on said support for holding said members in one of said positions, said biasing means acting on said actuating members with different forces; a plurality of actuating means connecting said membrane portions with said actuating members, respectively, so that different forces are transmitted to said membrane portions and movement of each membrane portion causes movement of the correlated actuating member to the other position thereof; and means for applying a fluid to said membrane portions so that said actuating'mem bers are individually operated by saidmembrane portions moved by the fluid when the increasing pressure of the fluid successively overcomes said different forces.
  • a membrane switch according to claim 1 said actuating means including plates respectively secured to said membrane portions. 7
  • a membrane switch according to claim 1 said actuating means connecting one side of said membrane portions with said actuating members, respectively, said fluid being applied to the other side of said membrane portions.
  • a membrane switch comprising, in combination, a support; membrane means mounted on said support and including a fold and a plurality of independently movable membrane portions separated by'said fold; a plurality of contact means mounted on said support, each contact means including an actuating member movable between two positions; biasing means on said support for holding said members in one of said positions, said biasing means acting on said actuating members with different forces; a plurality of actuating means connecting said membrane portions with said actuating members, respectively, so that different forces are transmitted to said membrane portions and movement of each membrane portion causes movement of the correlated actuating member to the other position thereof; and means for applying a fluid to said membrane portions so that said actuating members are individually operated by said membrane portions moved b the fluid when the increasing pressure of the fluid successively overcomes said different forces.
  • a membrane switch according to claim 3, said support comprising a housing, said membrane means mounted on said housing and dividing said housing into two chambers, said contact means mounted on said housing in one of said chambers, and said means for applying a fluid to the other side of said membrane portions connected to the other of said chambers.
  • a membrane switch comprising, in combination a housing; membrane means mounted on said housing and including a fold means and a plurality of independently movable membrane portions separated by said fold means, said membrane means dividing said housing into two chambers; a plurality of contact means mounted on said housing in one of said chambers, each contact means including an actuating member movable between two positions; biasing means on said housing for holding said members in one of said positions, said biasing means acting on said actuating members with different forces; a plurality of actuating means connecting one side of said membrane portions with said actuating members and including plates respectively secured to said membrane portions so that different forces are transmitted to said membrane portions and movement of each membrane portion causes movement of the correlated actuating member to the other position thereof; and means connected to the other of said chambers for applying a fluid to the other side of said membrane portions so that said actuating members are individually operated by said membrane portions moved by the fluid when the increasing pressure of the fluid successively overcomes said different forces.
  • a membrane switch comprising, in combination, a support; membrane means mounted on said support and including straight fold means and two independently movable membrane portions separated by said fold means; a plurality of contact means mounted on said support, each contact means including an actuating member movable between two positions; biasing means on said support for holding said members in one of said positions, said biasing means acting on said actuating members with different forces; a plurality of actuating means connecting one side of said membrane portions with said actuating members, respectively, so that different forces are transmitted to said membrane portions and movement of each membrane portion causes movement of the correlated actuating member to the other position thereof, said actuating means including segment-shaped plates respectively secured to said membrane portions, said segment-shaped plates having straight edges located on opposite sides of, and adjacent said straight fold of said membrane means; and means for applying a fluid to the other side of said membrane portions so that said actuating members are individually operated by said membrane portions moved by the fluid when the increasing pressure of the fluid successively overcomes said different forces.
  • a membrane switch comprising, in combination, a support; membrane means mounted on said support and including a circular fold, an inner movable membrane portion surrounded by said fold, and an outer annular membrane portion surrounding said fold so that said membrane portions are movable independently of each other; a plurality of contact means mounted on said support,
  • each contact means including an actuating member movable between two positions; biasing means on said support for holding said members in one of said positions, said biasing means acting on said actuating members with different forces; a plurality of actuating means connecting one side of said membrane portions with said actuating members, respectively, so that different forces are transmitted to said membrane portions and movement of each membrane portion causes movement of the correlated actuating member to the other position thereof, one of said actuating means including a circular member secured to said inner membrane portion, and another actuating means including an annular member secured to said outer annular membrane portion; and means for applying a fluid to the other side of said membrane portions so that said actuating members are individually operated by said membrane portions moved by the fluid when the increasing pressure of the fluid successively overcomes said different forces.
  • a membrane switch comprising, in combination, a housing; membrane means mounted on said housing and including straight fold and two independently movable membrane portions separated by said fold, said membrane means dividing said housing into two chambers; a plurality of contact means mounted on said housing in one of said chambers, each contact means including an actuating member movable between two positions; biasing means on said housing for holding said members in one of said positions, said biasing means acting on said actuating members with different forces; a plurality of actuating means connecting one side of said membrane portions with said actuating members, respectively, so that different forces are transmitted to said membrane portions and movement of each membrane portion causes movement of the correlated actuating member to the other position thereof, said actuating means including segmentshaped plates respectively secured to said membrane portions, said segment-shaped plates having straight edges located on opposite sides of, and adjacent said straight fold of said membrane means; and means connected to the other of said chambers for applying a fluid to the other side of said membrane portions so that said actuating members are individually operated by said membrane portions moved by the fluid when the increasing
  • a membrane switch comprising, in combination, a housing; membrane means mounted on said housing and including a circular fold, an inner movable membrane portion surrounded by said fold, and an outer annular membrane portion surrounding said fold so that said membrane portions are movable independently of each other, said membrane means dividing said housing into two chambers; a plurality of contact means mounted on said housing in one of said chambers, each contact means including an actuating member movable between two positions; biasing means on said housing for holding said members in one of said positions, said biasing means acting on said actuating members with diflerent forces; a plurality of actuating means connecting one side of said membrane portions with said actuating members, respectively, so that different forces are transmitted to said membrane portions and movement of each membrane portion causes movement of the correlated actuating member to the other position thereof, one of said actuating means including a circular member secured to said inner membrane portion, and another actuating means including an annular member secured to said outer annular membrane portion; and means connected to the other of said chambers
  • a membrane switch comprising, in combination, a M
  • a membrane means mounted in said housing and including an inner membrane portion and an outer annular membrane portion surrounding said inner membrane portion, said membrane means including an additional portion intermediate said inner and outer membrane portions, said additional portion being constructed and arranged to permit movement of said inner and outer membrane portions independently of each other, said membrane means forming in said housing at one side thereof a chamber for a fluid adapted to act on said membrane means;
  • two contact means mounted on said housing on the other side of said membrane means, each contact means including an actuating member movable between two positions; biasing means on said support for holding said actuating members in one of said positions, respectively, said biasing means acting on said actuating members with different forces;
  • a first actuating means including a bellshaped member having an annular rim secured to said annular membrane portion at said other side of said membrane means, and a projection connected with one of said actuating members, said bell-shaped member having an opening spaced from said projection;
  • a second actuating means including a plate secured to said inner membrane portion and a projecting arm passing
  • a membrane switch as set forth in claim 15 wherein said plate is circular, and wherein said projecting arm and said projecting portion project from the periphery of said plate perpendicularly to the same and are located diametrically opposite each other; and including a guide pin projecting from the center of said plate'perpendicularly to the same, said bell-shaped member having in the top thereof a guide bore for the passage of said guide pin; and guide means on said housing for guiding the free end of said guide pin.
  • said intermediate additional portion of said membrane means is a circular fold convex toward the other side of said membrane means.
  • a membrane switch comprising, in combination, a
  • membrane means mounted on said support and including a first movable membrane portion, a second movable membrane portion, :and means intermediate said first and second movable membrane portions and includ ing a portion of said membrane means and permitting said movable membrane portions to move substantially independently of each other; a plurality of contact means mounted on said support; a plurality of actuating means connecting said contact means with said movable membrane portions, respectively, so that movement of the latter causes actuation of said contact means, respectively; a plurality of biasing means for applying different forces to one side or" said membrane portions; and means for applying fluid pressure to the other side of said membrane portions so that said contact means are individually actuated when different fluid pressures act on and displace said membrane portions.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Push-Button Switches (AREA)
US385186A 1963-07-25 1964-07-27 Membrane switch with first and second independently movable portions Expired - Lifetime US3303306A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB72838A DE1214302B (de) 1963-07-25 1963-07-25 Elektrischer Membrandruckschalter

Publications (1)

Publication Number Publication Date
US3303306A true US3303306A (en) 1967-02-07

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ID=6977608

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US385186A Expired - Lifetime US3303306A (en) 1963-07-25 1964-07-27 Membrane switch with first and second independently movable portions

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US (1) US3303306A (de)
AT (1) AT240955B (de)
BE (1) BE650861A (de)
CH (1) CH425953A (de)
DE (1) DE1214302B (de)
GB (1) GB1033475A (de)
NL (1) NL6408494A (de)
SE (1) SE218749C1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786212A (en) * 1971-05-31 1974-01-15 E Weber Condition responsive control device with capacity for independent adjustment of control points
US8420965B2 (en) 2010-08-17 2013-04-16 Apple Inc. Button assembly with drive assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2668852B1 (fr) * 1990-11-06 1994-05-13 Eaton Sam Pressostat pour la securite thermique d'une machine a laver ou appareil analogue.
EP0512937A1 (de) * 1991-05-07 1992-11-11 Fagor, S.Coop. Ltda. Verbesserungen an Druckschaltern

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975251A (en) * 1958-02-20 1961-03-14 Controls Co Of America Pressure switch
US3064094A (en) * 1959-09-28 1962-11-13 American Radiator & Standard Pressure switch for washing machine tub level control
US3187136A (en) * 1961-10-16 1965-06-01 Robertshaw Controls Co Multiple pressure switch construction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2975251A (en) * 1958-02-20 1961-03-14 Controls Co Of America Pressure switch
US3064094A (en) * 1959-09-28 1962-11-13 American Radiator & Standard Pressure switch for washing machine tub level control
US3187136A (en) * 1961-10-16 1965-06-01 Robertshaw Controls Co Multiple pressure switch construction

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786212A (en) * 1971-05-31 1974-01-15 E Weber Condition responsive control device with capacity for independent adjustment of control points
US8420965B2 (en) 2010-08-17 2013-04-16 Apple Inc. Button assembly with drive assembly
US8809708B2 (en) 2010-08-17 2014-08-19 Apple Inc. Button assembly with drive assembly

Also Published As

Publication number Publication date
BE650861A (de) 1964-11-16
DE1214302B (de) 1966-04-14
CH425953A (de) 1966-12-15
SE218749C1 (de) 1968-02-13
AT240955B (de) 1965-06-25
GB1033475A (en) 1966-06-22
NL6408494A (de) 1965-01-26

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