US3042764A - Electric switch and sealing element therefor - Google Patents

Electric switch and sealing element therefor Download PDF

Info

Publication number
US3042764A
US3042764A US803945A US80394559A US3042764A US 3042764 A US3042764 A US 3042764A US 803945 A US803945 A US 803945A US 80394559 A US80394559 A US 80394559A US 3042764 A US3042764 A US 3042764A
Authority
US
United States
Prior art keywords
housing
sealing element
foil
sealing
switching unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US803945A
Other languages
English (en)
Inventor
Hermle Eduard
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3042764A publication Critical patent/US3042764A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/04—Cases; Covers
    • H01H13/06—Dustproof, splashproof, drip-proof, waterproof or flameproof casings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20396—Hand operated
    • Y10T74/20468—Sliding rod
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/2093—Slot closers and lever guards

Definitions

  • the present invention relates to improvements in electric switches, and more-particularly to devices of the type known as limit switches.
  • the invention also relates to a novel sealing element for use in such switches It is already known to utilize limit switches with one or more actuating elements which are operated from the outside, for example, by movable component parts of machine tools or the like. The movable part or parts of the machine tool would act against and axially displace the springbiased actuating element or elements of the limit switch whereupon each actuating element operates an electric switching unit built into the housing of the limit switch and comprising fixed and movable contact members of known construction.
  • each switching unit and the respective actuating element are preferably separated by a sealing plate of elastic material whose peripheral zones are rigidly held in the housing of the limit switch.
  • the elastic plate is subjected to considerable deformation during each movement of the actuating element or elements and, being positively held solely along its peripheral zone, the major portion of its body follows the movements of respective actuating elements when the operation'of one or more switching units is desired.
  • An important object of the present invention is to provide an electric switch which fully overcomes the aforementioned drawbacks of prior switching devices in that it positively prevents entry of foreign matter into the compartment. in which the switching unit or units aremounted; which isfreliable in operation over prolonged periods of actual use; which is of very simple construction; and which may be utilized as a single or as a multiple switch.
  • Another object of the invention is to provide a limit switch embodying a novel sealing element which is so constructed as to return into neutral or idle position after each deformation occurring whenever the switch is put to use; which cannot become distorted when the switch is actuated; which cannot be removed from sealing engagement with other component parts of the switchduring actual use; and which may be simultaneously utilized as a sealing means for two or more switching units.
  • a further object of the instant invention is to provide a limit switch of the above outlined character which is so constructed that the force with whichits actuating element or elements bear against the aforementioned sealing element may be adjusted within any desired range.
  • a still further object of the invention is to provide a limit switch embodying a novel sealing element of the above described type which is particularly suitable for use in connection with machine tools, and which is capable of being put to use in a number of different positions. 7
  • a yet further object of the invention is to provide an electric switch for use as a limit switch whose sealing element for the switching unit or units may be readily inserted into or removed from the housing of the switch, and whose switching unit or units may be actuated directly or indirectly over suitable motion and pressure transferring members.
  • an electric switch preferably of the type known as limit switch, which comprises a housing formed with a suitable chamber for reception of at least one switching unit of known construction, i.e. comprising a fixed and a movable contact member which latter extends therefrom and, upon depression thereof, operates the switching unit to establish or break the electric circuit in which the unit is installed.
  • the housing also supports actuating means for each switching unit, each actuating means comprising a spring biased pushbutton which may be so installed in the housingas to directly operate the movable contact member of the respective switching unit, or may be operatively connected with a second actuating element in the form of a stud or the like which latter is caused to engage a movable contact member whenever the push-button associated therewith is moved in a direction to extend further into the housing.
  • each actuating means comprising a spring biased pushbutton which may be so installed in the housingas to directly operate the movable contact member of the respective switching unit, or may be operatively connected with a second actuating element in the form of a stud or the like which latter is caused to engage a movable contact member whenever the push-button associated therewith is moved in a direction to extend further into the housing.
  • the novel sealing element which separates each actuating means from each switching unit comprises a rigid plate-like carrier, preferably made of a suitable metallic material and formed with one or more preferably circular apertures, one for each movable contact member, the apertures being located in surrounding relationship about the respective movable contact members.
  • the carrier is securely fixed into the housing and is in face-to-face contact with the second component of the sealing element which consists of an elastic foil or sheet, preferably made of rubber, of an elastic synthetic plastic, or of a highly elastic metallic sheet material.”
  • the foil seals each aperture in the carrier and is rigidly secured thereto, e.g. by means of an adhesive or in any other suitable way.
  • That portion of the foil which seals an aperture in the carrier constitutes a flexible diaphragm which is formed with an endless, preferably circular, corrugation or bead surrounding a preferably reinforced portion of the foil therewithin, this reinforced portion serving as a means for transmitting motion to the movable contact member of a selected switching unit when the respective push-button is depressed in a direction to extend further into the housing.
  • each diaphragm may be of circular shape and may extend at least slightly into the respective aperture in the carrier. If desired, a
  • preferably metallic insert of cylindrical or other shape may be embedded, e.g. vulcanized, into the motion transmitting portion to directly engage with the adjacent movable contact member when it is directly or indirectly displaced by the push-button of respective actuating means.
  • the housing of the switch may comprise two or more switching units and an equal number of push-buttons which may be arranged in a single row or in pairs, depending upon the intended use of the apparatus.
  • the novel sealing element constitutes an airand water-tight sealing means between the actuating means and the spears i switching units and, as the diaphragms may be of comparatively small diameters, their exposed surfaces are not likely to be rapidly destroyed by molsture, 011, dust .or other foreign matter.
  • novel sealing element may be separated from atmosphere by suitable cover plates and sealing rings which latter, however, are then formed with adequate openings to permit reciprocating movements of certain components of the actuating means into contact with the diaphragm or diaphragms of the above described foil which forms part of the novel sealing element.
  • Adjusting means may be provided for controlling the extent to which the movable element or elements of actuating means may displace the respective diaphragm or diaphragms, i.e. to control the extent to which the respective movable contact member or members are depressed when a switching unit is operated.
  • the foil may consist of a single homogeneous body of elastic material, or it may consist of several smaller units individually secured to the carrier.
  • FIG. 1 is a transverse section through a limit switch embodying my invention, the section being taken on line 1-1 of FIG. 2, as seen in the direction of arrows;
  • FIG. 2 is a section through the limit switch taken on line 2-2 of FIG. 1, as seen in the direction of arrows;
  • FIG. 3 is top plan view of a plate-like sealing element constituting a component part of the limit switch shown in FIGS. 1 and 2;
  • FIG. 4 is a transverse section taken substantially along the line 4-4 of FIG. 3, as seen in the direction of arrows;
  • FIG. 5 is a greatly enlarged fragmentary sectional view illustrating a detail of the sealing element, the section being taken on line 55 of FIG. 3;
  • FIG. 6 is a similar fragmentary sectional view showing a detail of a modified sealing element.
  • the device therein shown is a so-called multiple limit switch consisting of four individual switch assemblies which are arranged in a single row.
  • the multiple switch comprises a housing or casing 10 whose open lower end is closed in actual use by a cover or lid 11 with a packing in the form of a sealing plate 12 interposed between parts 10 and 11. Adjacent to the inner side of sealing plate 12, the housing 10 defines a space or chamber 14. Flanges 15, connected to and extending from the outer sides of housing 10, facilitate connection of the multiple switch at any point of desired use, for example, to a machine tool or the like.
  • FIG. 1 in FIG. 1 comprises an actuating element or push-button 20 whose upper end extends beyond the housing 10 and is bounded by a pair of inclined surfaces 21.
  • the main body portion of actuating element 20- is reciprocably received for axial movements in a vertical bore 10a formed in housing 10, and has a coaxial blind bore 20a receiving a helical expansion spring 36.
  • the flange 28 at the upper end of a holder 29 is adjacent to the underside of. sealing element 26 which latter is shown in greater detail in FIGS. 3 to 5.
  • a sealing ring 30 is disposed between the upper end wall of chamber 14 and the upper side of cover plate 24, and a similar sealing ring 33 is inserted between the underside of sealing element 26 and the upper side of flange 28'.
  • Parts 24, 26, 28-49, 30 and 33 are fixed to the housing or casing 10 by one or more screws 32.
  • the lower end of aforementioned expansion spring 36 extends through an opening in sealing ring 30 and is received in a shallow groove formed in the upper side of plate 24.
  • spring 36 constantly urges the upper end of actuating element 20 in a direction away from housing 10 to the extent determined by collar 35 which then abuts against the upper end wall of a recess or cavity 70 separated from chamber 14 therebelow by sealing ring 30.
  • a bolt 38 is installed in the bore 10b of housing 01' casing 1t) .and is preferably parallel with the axis of pushbutton or actuating element 20.
  • the second actuating element or bolt 38 is formed with an annulus 40 whose frustoconical lower half tapers inwardly and downwardly and is connected to or integral with a downwardly extending cylindrical stud 39.
  • the bifurcated portion 37 of external collar 35 at the lower end of push-button 20 engages with the underside of annulus 4t) and thus determines the extent to which the bolt 58 can move in downward direction under the action of a helical expansion spring 41 which latter operates between the upper end wall of bore 1% and the annular i the outer end faces 76 of respective members 75.
  • Spring 41 is weaker thanthe first-men-.
  • tioned spring 36 in the bore 20a of actuating element 20.
  • the upper end of the second actuating element or bolt 33 extends into the bore 42 of a terminal screw 43 which latter is retained in the switch housing 10.
  • the holder 29 comprises a series of spaced vertical Webs or walls 45 (see FIG. 2) defining a series of recesses for reception of switching boxes or units 48 fixed to webs 45 by anchor bolts 50.
  • Each unit 48 comprises an upwardly extending contact pin 51, and opposite thereto terminals 48a are provided to which wires 48b are attached as by soldering.
  • An adjusting screw 53 is threaded into a tapped horizontal bore 10c formed in the casing 10. This screw is formed with a conical end portion 54 which cooperates with the frusto-conical lower half of annulus 40' at lower end of bolt 38. i
  • the sealing element 26 is shown in full detail in FIGS. 3 to 5. It comprises a plate or carrier 60 made preferably of a metallic material, e.g. steel, and a homogeneous sealing sheet or foil 72 which is in face-to-face sealing contact with member 60', e.g. it may be glued, vulcanized or otherwise securely connected thereto.
  • Carrier or plate 60' is formed with circular cutouts or apertures 61, one for each cylindrical stud 39, enabling the latter to act against the contact pins 51 of respective switching units 48.
  • the circular zones of foil 72 which cover the apertures 61 constitute four diaphragms 74 each of which is formed with a reinforced median portion 75 whose purpose is to transfer pressure and motion from respective stud 39 to adjacent contact pin 51.
  • FIGS. 4 and 5 left-hand ends of pressure and motion trans mitting members or portions 75 projectto a certain extent into the respective cutouts 61 in carrier 60. ends of cylindrical studs 39 are adapted to engage with Each the i
  • the relatively small and preferably, though not necessarily, circular membrane 74 comprises an endless annular corrugation or bead 73 which surrounds the respective pressure transmitting member 75.
  • the material of which the sheet or foil 72 is made may be rubber, an elastic synthetic plastic, or a highly elastic metallic substance. It is equally possible to utilize a number of individual foils each of which then covers one of apertures 61 in carrier 60 and has its peripheral zone rigidly fastened to the latter. However, a homogeneous, unitary foil is preferred because its material is less likely to show signs of fatigue or breakdown and, consequently, remains operative during a practically unlimited number of switching operations even under very unfavorable operating conditions. This is particularly important when the novel switch is utilized in expensive machine tools.,
  • the multiple switch operates as follows:
  • the recess 70 is practically perfectly sealed from chamber 14 therebelow by ring 30, cover plate 24 and by the cylindrical studs 39 which latter are snugly received in openings provided therefor in member 24.
  • An additional and even more perfect seal between chamber 14 and recess 70 is provided by the sealing element 26' whose continuous foil "/2 is tightly pressed against the underside of cover plate 24 by screws 32.
  • the lower end of chamber 14 is completely sealed from atmosphere by the packing 12 and lid-11; thus, the switching units 48 are fully protected from dust, moisture, or any other foreign matter.
  • FIG. 6 illustrates a modified sealing element 26a conwhich is securely embedded therein;
  • the diaphragm 82 consists of rubber or an elastic synthetic plastic substance
  • the rigid insert 83 may be vulcanized. or glued into its reinforced portion 84-.
  • the function of this combined sealing and pressure transferring element 26a is identical with that of composite member 26.
  • foil 72 or 86 Another important advantage of foil 72 or 86 is in that, due to the provision of corrugations 73, 86, re-
  • push-buttons 20 may be formed with extensions similar to studs 39 and so installed in housing 10 as to act directly against members 75 or '83, inwhich case the bolts 38 may be omitted together with springs 41 and annuli 40.
  • An electric limit switch comprising, in combination: a housing; at least one actuating means each including a spring biased push-button reciprocably installed in said housing and constantly urged in a direction to extend from the housing, a spring biased bolt reciprocably received in said housing and parallel with the respective push-button, each bolt comprising an annulus and a stud, stop means connected with each push button and engageable with the annulusof respective bolt, and spring means for constantly urging the annulus of each bolt into engagement with the respective stop means; a switching unit for each actuating means received in said housing, each switching unit including a movable contact member operable by the respective stud when the push-button associated therewith is displaced in a direction to extend further into said housing and the stop means connected therewith is displaced; and a sealing element installed, in said housing for separating each stud from each Contact member, said sealing element comprising a plate-like carrier of metallic material having an aperture for and adjacent to the contact member of each switching unit, and a foil of elastic material connected and in permanent surface-to
  • An electric limit switch comprising, in combination: a housing; at least one actuating means each including a spring .biased push-button reciprocably installed in said housing'and constantly urged in a direction to extend from the housing, a spring biased bolt reciprocably received in said housing and parallel with the respective push-button, each bolt comprising an annulus and a stud, stop means connected with each push button and engageable with the annulus of respective bolt, and spring means for constant- 13 urging the annulus of each bolt into engagement with the respective stop means; adjusting means comprising a member located in the path of each annulus for controlling the extent to which the respective bolt is movable by said spring means; a switching unit for each actuating means received in said housing, each switching unit including a movable contact member operable by the respective stud when the push-button associated therewith is displaced in a direction to extend further into said housing and the stop means connected therewith is displaced; and a sealing element installed in said housing for separating each stud from each contact member, said sealing element compris
  • a sealing element comprising a rigid flat carrier member adapted to be arranged between said actuating meansand said switching units and having a plurality of apertures passing therethrough and each adapted to be located between one of said actuating means and the corresponding switching unit, said rigid fiat carraliy of surface portions each surrounding one of said apertures; and a foil of elastic material covering said surface of said rigid carrier permanently sealed at least to said surface portions thereof along said apertures, said foil thus forming over each of saidapertures a diaphragm covering the respective aperture, said foil including an annular corrugation in each of said diaphragms whereby, the portion of each diaphragm surrounded by the respective annular corrugation is movable relative to said rigid flat carrier member by the corresponding actuating means, while due to the sealing of said foil of elastic material to said surface
  • a sealing element comprising a rigid flat carrier member adapted to be arranged between said actuating means and said switching units and having a plurality of aligned apertures passing therethrough and each adapted to be located between one of said actuating means and the corresponding switching unit, said rigid fiat carrier having on one side thereof a surface surrounding said aligned aperturesj and a foil of elastic material covering said surface of said rigid carrier permanently sealed thereto, said foil thus forming over v each of said aligned apertures a diaphragm covering the respective aperture, said foil including an annular corru-.
  • each actuating means is positively limited to the corresponding switching unit.
  • An electric switch comprising in combination, a housing; a plurality of actuating means arranged within said housing side by side and reciprocably relative to said housing; a plurality of switching units arranged also in said housing side by side, each of said switching units including a movable contact member located opposite one of said actuating means and adapted to be moved by the latter; and a sealing element arranged in said housing for separating said plurality of actuating means'from said plurality of switching units, said sealing element comprising a rigid flat carrier member arranged within said housing with said plurality of actuating means located on one side of said rigid flat carrier member and with said plurality of switching units located on the other side of said rigid ilat carrier member separated from said plurality of actuating means by said rigid flat carrier member, said rigid ilat carrier member having a plurality of apertures, each located between one of said actuating means andthe corresponding switching unit and each having an area substantially greater than the area of the actuating means adapted to engage the movable contact member of the corresponding switching unit,
  • An electric switch comprising in combination, a
  • said sealing element comprising a rigid flat carrier member arranged within said housing with said plurality of actuating means located on one side of said rigid flat carrier member and with said plurality of switching units located on the other side of said rigid flat carrier member separated from said plurality of actuating means by said rigid fiat carrier member, said rigid fiat carrier member having a plurality of apertures, each located between one of said actuating ineansand the corresponding switching unit and each having an area substantially greater than the area of the actuating means adapted to engage the movable contact member of the corresponding switching unit, said rigid flat carrier member having on one side thereof a surface including a plurality of surface portions each surrounding one of said apertures, and foil means of elastic material located on said surface and sealed at least to said surface portions surrounding said apertures, said foil means forming within each of said apertures a diaphragm and including within each of said diaphragms a resilient annular portion sub- (References on following page) 1 References Cited?1 the file of this patent
US803945A 1958-04-12 1959-04-03 Electric switch and sealing element therefor Expired - Lifetime US3042764A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEH32967A DE1089037B (de) 1958-04-12 1958-04-12 Wasserdichte Anordnung mehrerer elektrischer Stoesselschalter
DEH35522A DE1105027B (de) 1958-04-12 1959-02-02 Wasserdichte Anordnung mehrerer elektrischer Stoesselschalter

Publications (1)

Publication Number Publication Date
US3042764A true US3042764A (en) 1962-07-03

Family

ID=25979477

Family Applications (1)

Application Number Title Priority Date Filing Date
US803945A Expired - Lifetime US3042764A (en) 1958-04-12 1959-04-03 Electric switch and sealing element therefor

Country Status (5)

Country Link
US (1) US3042764A (fr)
CH (1) CH366579A (fr)
DE (2) DE1089037B (fr)
FR (1) FR1219451A (fr)
GB (1) GB848538A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192350A (en) * 1961-12-06 1965-06-29 Paramount Textile Mach Co Sealed electrical switching control unit using linear cam actuator
US3372246A (en) * 1964-08-14 1968-03-05 Itt Waterproof pushbutton telephone subset
US3663781A (en) * 1970-11-23 1972-05-16 Scm Corp Electrical switch having a flexible one-piece actuator
US3694606A (en) * 1971-06-29 1972-09-26 Ibm Elastic diaphragm switch actuator
JPS49109160U (fr) * 1973-01-11 1974-09-18
US3890480A (en) * 1974-05-23 1975-06-17 Cincinnati Milacron Inc Hermetic sealing structure for electronic keyboard apparatus
US4071718A (en) * 1976-10-22 1978-01-31 Bowmar Instrument Corporation Flat keyboard assembly having cover type membrane with protrusions to align switch components
US4695681A (en) * 1985-05-22 1987-09-22 Velleman-Switch, Naamloze Vennootschap Membrane for membrane switches and composing elements thereof
US6291784B1 (en) * 1997-03-11 2001-09-18 Itt Automotive Europe, Gmbh Snap switch
US9671813B2 (en) * 2011-09-06 2017-06-06 Omron Corporation Trigger switch

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1227117B (de) * 1962-11-23 1966-10-20 Siemens Ag Anordnung zum fluessigkeitsdichten Abschluss von Gehaeusen
JPS5634661Y2 (fr) * 1976-12-07 1981-08-15
JPS55155424A (en) * 1979-05-24 1980-12-03 Omron Tateisi Electronics Co Dip switch

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR844387A (fr) * 1937-10-06 1939-07-24 Burgess Products Co Ltd Perfectionnements aux interrupteurs et commutateurs électriques à déclic
US2537308A (en) * 1945-06-15 1951-01-09 Dole Valve Co Diaphragm gasket
DE760755C (de) * 1941-07-24 1953-01-05 Busch Jaeger Luedenscheider Me In ein Gehaeuse eingebauter wasserdichter Druckknopfschalter mit zwei Druckknoepfen oder mit einer Schaltwippe, der durch Eindruecken einer am Gehaeuserand wasser- und druckdicht festgeklemmten Membran betaetigt wird
US2757689A (en) * 1952-12-22 1956-08-07 Hydril Co Accumulator or pulsation dampener
US2764097A (en) * 1953-03-04 1956-09-25 Lindsay H Browne Pump
US2766350A (en) * 1953-11-17 1956-10-09 Marcel E Gres Diaphragm actuated snap action switch
US2769882A (en) * 1952-11-10 1956-11-06 Maurice B Vitus Electric switches
US2804516A (en) * 1954-02-25 1957-08-27 Gen Electric Sump pump liquid level control switch

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE351809C (de) * 1920-09-11 1922-04-13 Siemens & Halske Akt Ges Elektrischer Druckkontakt
US2368926A (en) * 1941-09-29 1945-02-06 M L Jeffrey Corp Submergible switch
US2431747A (en) * 1943-07-15 1947-12-02 First Ind Corp Switch mechanism
US2618718A (en) * 1949-10-31 1952-11-18 Siemens Ag High-speed electric switching apparatus
US2650964A (en) * 1952-01-28 1953-09-01 Razdow Adolph Snap switch
DE1075705B (de) * 1953-06-22 1960-02-18 Haydon Switch, Incorporated, Waterbury Conn (V. St A) Schnappschalter
DE970015C (de) * 1953-07-31 1958-08-14 Siemens Ag Abdichtung von in einer Wanddurchbrechung angebrachten Betaetigungsdruckknoepfen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR844387A (fr) * 1937-10-06 1939-07-24 Burgess Products Co Ltd Perfectionnements aux interrupteurs et commutateurs électriques à déclic
DE760755C (de) * 1941-07-24 1953-01-05 Busch Jaeger Luedenscheider Me In ein Gehaeuse eingebauter wasserdichter Druckknopfschalter mit zwei Druckknoepfen oder mit einer Schaltwippe, der durch Eindruecken einer am Gehaeuserand wasser- und druckdicht festgeklemmten Membran betaetigt wird
US2537308A (en) * 1945-06-15 1951-01-09 Dole Valve Co Diaphragm gasket
US2769882A (en) * 1952-11-10 1956-11-06 Maurice B Vitus Electric switches
US2757689A (en) * 1952-12-22 1956-08-07 Hydril Co Accumulator or pulsation dampener
US2764097A (en) * 1953-03-04 1956-09-25 Lindsay H Browne Pump
US2766350A (en) * 1953-11-17 1956-10-09 Marcel E Gres Diaphragm actuated snap action switch
US2804516A (en) * 1954-02-25 1957-08-27 Gen Electric Sump pump liquid level control switch

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192350A (en) * 1961-12-06 1965-06-29 Paramount Textile Mach Co Sealed electrical switching control unit using linear cam actuator
US3372246A (en) * 1964-08-14 1968-03-05 Itt Waterproof pushbutton telephone subset
US3663781A (en) * 1970-11-23 1972-05-16 Scm Corp Electrical switch having a flexible one-piece actuator
US3694606A (en) * 1971-06-29 1972-09-26 Ibm Elastic diaphragm switch actuator
JPS49109160U (fr) * 1973-01-11 1974-09-18
US3890480A (en) * 1974-05-23 1975-06-17 Cincinnati Milacron Inc Hermetic sealing structure for electronic keyboard apparatus
US4071718A (en) * 1976-10-22 1978-01-31 Bowmar Instrument Corporation Flat keyboard assembly having cover type membrane with protrusions to align switch components
US4695681A (en) * 1985-05-22 1987-09-22 Velleman-Switch, Naamloze Vennootschap Membrane for membrane switches and composing elements thereof
US6291784B1 (en) * 1997-03-11 2001-09-18 Itt Automotive Europe, Gmbh Snap switch
US9671813B2 (en) * 2011-09-06 2017-06-06 Omron Corporation Trigger switch

Also Published As

Publication number Publication date
FR1219451A (fr) 1960-05-18
DE1105027B (de) 1961-04-20
CH366579A (de) 1963-01-15
DE1089037B (de) 1960-09-15
GB848538A (en) 1960-09-21

Similar Documents

Publication Publication Date Title
US3042764A (en) Electric switch and sealing element therefor
US5258592A (en) Waterproof switch apparatus for electronic device
US3267233A (en) Pneumatic transducer
US5898147A (en) Dual tact switch assembly
US2984726A (en) Sealed push button control switch
US5510584A (en) Sequentially operated snap action membrane switches
US4659881A (en) Multidome multistage switch assembly
US4091249A (en) Pressure sensitive electrical switch having a snap element
CA1317334C (fr) Interrupteur a cupture brusque
KR970029942A (ko) 푸시온 스위치
GB1298290A (en) An electrical switch
GB1398884A (en) Switching device
US3378656A (en) Adjustment means for electrical switch
US4803321A (en) Axial load resistant key switch
US3018338A (en) Control switches
FI59219C (fi) Elastiskt membranomkopplartangentbord
JPH03291820A (ja) 圧力応答スイッチ
GB2054268A (en) Double-domed conductive disc
US6774330B2 (en) Multi-stage push button switch apparatus
US4931605A (en) Multi-pole switch
US2494213A (en) Fluid operated switch assembly
US7723631B2 (en) Keyboards
US2787681A (en) Pressure actuated switches
GB1445272A (en) Electrical switching devices
GB2132415A (en) Diaphragm pressure switch