US3794788A - Electrical switch - Google Patents

Electrical switch Download PDF

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Publication number
US3794788A
US3794788A US00298232A US3794788DA US3794788A US 3794788 A US3794788 A US 3794788A US 00298232 A US00298232 A US 00298232A US 3794788D A US3794788D A US 3794788DA US 3794788 A US3794788 A US 3794788A
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US
United States
Prior art keywords
toggle
leaf spring
spring
joint
contact means
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
US00298232A
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English (en)
Inventor
H Leibundgut
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.)
Johnson Electric Switzerland AG
Original Assignee
Johnson Electric Switzerland AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Johnson Electric Switzerland AG filed Critical Johnson Electric Switzerland AG
Application granted granted Critical
Publication of US3794788A publication Critical patent/US3794788A/en
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
    • 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
    • H01H13/26—Snap-action arrangements depending upon deformation of elastic members
    • H01H13/36—Snap-action arrangements depending upon deformation of elastic members using flexing of blade springs

Definitions

  • the present invention concerns an electrical switch, preferably a small or miniature switch, with a double toggle action, having at least one fixed pivot, two fixed contacts and a movable contact, and a movable actuating member.
  • a snap switch which comprises a toggle switch provided with an operating spring attached thereto and driven by means of a plunger and a return spring.
  • the system comprising a transmission arm and the operating spring, is set in motion before the zero point of the contact force is reached.
  • Another well-known small or miniature switch consists of a strip of band spring arcuately curved and loaded by an adjusting member near one clamped end and at the other clamped end having at least one longitudinally extending tongue, the free end of which bears against one of the two opposed operating points.
  • the object of the present invention is to construct a switch comprising a double toggle having none of the above disadvantages.
  • an electrical switch comprising a double toggle, with at least one stationary pivot, two fixed contacts, one movable contact and a movable actuating member, wherein a plurality of single toggles are nested one inside the other so that each member is simultaneously a component of at least two individual toggles, with at least two spanning members formed as pressure spring members acting in the same direction to ensure the positioning of the displaceable contact, all the substantially rigid links are pivotably connected together and only stressed in tension so that the sum on the differential ways of all the single toggles is less than the differential way of a single toggle, that the lag way is not functionally restricted and that the sum of the spring forces acting onthe movable contact changes its sign during the switching operation before the actuating member reaches the point of intersection of the extension of the spanning member disposed between a movable joint and a stationary pivot joint and the actuating line so that the condition contact pressure zero is not possible as a permanent condition at the fixed contacts.
  • the rigid connecting members are combined in a lamella.
  • FIG. 1 shows a schematic view of the present invention
  • FIG. 2 shows a diagram of the contact pressure of the double toggle of the present invention
  • FIG. 3 is a side view of a possible variant
  • FIG. 4 is a plan view of the double toggle shown in FIG. 3.
  • FIG. 1 shows the schematic design of a switch constructed according to the present invention wherein, for the sake of greater clarity, the switch housing, the electrical connections, the components for resetting and the like are omitted.
  • the FIG. 1 shows a fixed pivot 1, two fixed contacts 2 and 3, a movable contact 4, two auxiliary stops 5 and 6, two joints 7 and 8 which connect the two rigid links 9 and 10, which are under tensile load and non-positively but pivotably connected to the spanning members 11 and 12 with their compression springs 13, 14.
  • the FIG. 1 also shows a actuating line 15 along which an actuating member 16 is guided on operation.
  • the axis of symmetry 17 of the double toggle is shown, as also angles a and B and the contact pressure Pk indicated by the arrow 18.
  • FIG. 2 shows a graph of the contact pressure Pk.
  • the contact pressure Pk is shown on the ordinate 21 and the way of the actuating member 16 on line 15, on the abscissa 22.
  • the contact pressure Pk remains at first constant during the movement of the actuating member 16, to then gradually rise somewhat until the point 23 is reached where the joint 7 (FIG. 1) intersects the axis of the spanning member 12 (FIG. 1) whereon the pressure suddenly reverses at point 24 and intersects the abscissa.
  • the contact pressure Pk remains constant again substantially independently of the lag of the actuating member 16.
  • the return operation is effected in similar manner; the contact pressure Pk is practically constant again up to the point 26, in order to spring back through 27 to 28.
  • the difference way of the double toggle as a whole which is defined by the distance between the points 24 and 27, is equal to or, if all the parts are correctly designed, less than, for instance, the difference way of the single toggle formed by 9 and 11.
  • FIGS. 3 and 4 A practical embodiment of the double toggle switch of the present invention is shown in FIGS. 3 and 4, parts therein corresponding to those in FIG. 1, having the same reference numerals.
  • the two rigid connecting members 9 and 10 (FIG. 1) have been combined into an lamella 29, but without having lost the individual characteristics. Especially joint 7, the link 9 and the link 10 are unchanged.
  • the actuating member 16 is a plunger, the longitudinal axis of which corresponds to the actuating line 15.
  • the fixed pivot 1, on which the two compression springs 13 and 14 are mounted, is disposed on the edge of a carrier 31 anchored in the switch housing 30.
  • the two joints 7 and 8 are formed by specially shaped parts of the lamella 29 and serve as bearing points for the compression springs 13 and 14.
  • the two fixed contacts 2 and 3 are also unchanged, as well as the movable contact 4.
  • the axis of symmetry 17 corresponds to that of FIG. 1, as also the auxiliary stops 5 and 6.
  • the form of the lamella 29 and the arrangement of the compression springs 13 and 14 may be seen more easily from FIG. 4. It shows two recesses 32 and 33 formed in the lamella 29, which allow the positioning of the compression springs 13 and 14.
  • An electrical switch comprising a double toggle system including a first and second toggle interconnected by means of a toggle joint displaceable between two opposite end positions, said toggles extending in substantially opposite directions from said toggle joint, contact means displaceable between two opposite end positions and fixed at the free end of said first toggle, an actuating member, the end opposite said toggle joint of the second toggle being suspended for displacement by means of said actuating member in a direction substantially transversal to said directions of extension of said toggles, a first pressure spring disposed between said toggle joint and a fixed point and a second pressure spring disposed between said free end of said first toggle and a fixed point respectively, each of said toggles being subject to tension stresses by said springs, and said contact means being displaceable in a direction substantially transversal to said directions of extension of said toggles, said second toggle being reversible through an unstable position from one of its said end positions into the other of its end positions upon displacement of its end opposite said toggle joint by said actuating member, and said first toggle and contact means respectively being suddenly reversible by
  • a switch according to claim 3 wherein one end of said leaf spring is clamped in the switch casing, the clamped end of said leaf spring being interconnected with said second toggle by a weakened portion forming a joint.
  • An electrical switch comprising a double toggle system including a leaf spring having one end thereof fixed at the switch housing, contact means fixed at the free end of said leaf spring, said leaf spring having two weakened portions at a distance from each other and each at a distance from said spring ends, such weakened portions forming flexible joints, a spring section between said weakened portion and a spring section between the one weakened portion and said contact means respectively, each of said spring sections forming a toggle portion, stop means within reach of said contact means and of said weakened portion located nearer to the contact means for limiting flexion movement of the leaf spring in a direction substantially transverse to the flat extension of said leaf spring, an actuating member mounted for displacement in a direction substantially transverse to the flat extension of said leaf spring between said one end of the leaf spring and its weakened portion next to this one end, a pressure spring acting between a fixed point in said switch housing and said free end of the leaf spring and a pressure spring acting between a fixed point and said weakened portion nearest to said free end of the leaf spring, each of said toggle portions forming

Landscapes

  • Mechanisms For Operating Contacts (AREA)
  • Push-Button Switches (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
US00298232A 1971-11-08 1972-10-17 Electrical switch Expired - Lifetime US3794788A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1618871A CH544994A (de) 1971-11-08 1971-11-08 Elektrischer Schalter mit Doppelkipper

Publications (1)

Publication Number Publication Date
US3794788A true US3794788A (en) 1974-02-26

Family

ID=4415162

Family Applications (1)

Application Number Title Priority Date Filing Date
US00298232A Expired - Lifetime US3794788A (en) 1971-11-08 1972-10-17 Electrical switch

Country Status (4)

Country Link
US (1) US3794788A (de)
JP (1) JPS4858377A (de)
CH (1) CH544994A (de)
DE (1) DE2245206C3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH708894A1 (de) * 2013-11-26 2015-05-29 Werner Zumbrunn Sprungschalter mit konstanter Kontaktkraft.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62501317A (ja) * 1984-12-03 1987-05-21 フセソユズニ　ナウチノ−イススレドバテルスキ，プロエクトノ−コンストルクトルスキ　イ　テフノロギチエスキ　インステイテユト　フズリ−ボザスチスチエンノゴ　イ　ルドニチノゴ　エレクトロオボルドバニア マイクロスイツチ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2414778A (en) * 1945-11-05 1947-01-21 Clarence E Threedy Snap-action switch
US2688058A (en) * 1952-07-28 1954-08-31 Allen Bradley Co Snap switch apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2414778A (en) * 1945-11-05 1947-01-21 Clarence E Threedy Snap-action switch
US2688058A (en) * 1952-07-28 1954-08-31 Allen Bradley Co Snap switch apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH708894A1 (de) * 2013-11-26 2015-05-29 Werner Zumbrunn Sprungschalter mit konstanter Kontaktkraft.

Also Published As

Publication number Publication date
CH544994A (de) 1973-11-30
DE2245206B2 (de) 1974-02-07
JPS4858377A (de) 1973-08-16
DE2245206A1 (de) 1973-06-07
DE2245206C3 (de) 1974-08-29

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