EP2645391B1 - Switch device and switch contact - Google Patents

Switch device and switch contact Download PDF

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Publication number
EP2645391B1
EP2645391B1 EP12161463.0A EP12161463A EP2645391B1 EP 2645391 B1 EP2645391 B1 EP 2645391B1 EP 12161463 A EP12161463 A EP 12161463A EP 2645391 B1 EP2645391 B1 EP 2645391B1
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EP
European Patent Office
Prior art keywords
accordance
snap disc
switch device
snap
circuit board
Prior art date
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Application number
EP12161463.0A
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German (de)
French (fr)
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EP2645391A1 (en
Inventor
Peter GLÜCK
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.)
Rafi GmbH and Co KG
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Rafi GmbH and Co KG
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Priority to EP12161463.0A priority Critical patent/EP2645391B1/en
Publication of EP2645391A1 publication Critical patent/EP2645391A1/en
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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
    • H01H13/48—Snap-action arrangements depending upon deformation of elastic members using buckling of disc springs
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2207/00—Connections
    • H01H2207/032—Surface mounted component
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2215/00—Tactile feedback
    • H01H2215/004—Collapsible dome or bubble

Definitions

  • the invention relates to a switching device for converting a mechanical movement into an electrical switching signal according to the preamble of claim 1 ..
  • a switching device according to the preamble of claim 1 is known from EP 1 670 012 A2 known.
  • the snap disk is encapsulated by a plastic housing.
  • the plastic housing is manufactured using the two-component injection molding process and has been successfully sold by the patent applicants for years under the product name Racon®.
  • the plastic housing also has a rigid as a support frame serving outer contour, in the center on the top of the housing a flexurally elastic thin-walled plastic layer is present, which rests directly on the top of the snap disk in the assembled state and which serves as a membrane.
  • a flexurally elastic thin-walled plastic layer is present, which rests directly on the top of the snap disk in the assembled state and which serves as a membrane.
  • Such switching devices are mass-produced articles, since they are often used to control a machine tool in considerable numbers.
  • the snap disc and the body form an air- or water-tight housing and characterized in that the snap disc is mounted directly on the circuit board and electrically conductive, for example by means of a soldered seam, connected thereto via the integrated or printed circuit boards in the circuit board, creates a resilient switching device in which the switching contact is encapsulated by the snap-action disc and the body, since the snap disc closes the electrical switching contact together with the body and the circuit board airtight or waterproof.
  • the snap-action disc is accessible from the outside in order to convert a mechanical actuation into an electrical switching signal.
  • An additional encapsulation or attachment of the snap-action disc for example by means of a plastic housing, is advantageously eliminated, so that in this way assembly and production costs are saved.
  • the switching contact is designed as a ball, because a positioning of the ball in the ground during the manufacturing process by injection molding is not necessary. Only the wall thickness of the body enclosing the ball in the form of a bottom is to be adapted to the diameter of the ball so that the ball protrudes on two opposite sides of the body to be accessible to the snap disk and to rest on the trace of the circuit board can , so that an electrically conductive contact between the ball made of an electrically conductive material and the respective conductor track is formed. It is also possible to design the electrical switching contact in its cross section as an H-shaped electrically conductive body. The bottom of the switching device extends between the two parallel legs of the H-shaped switching contact. The two outer sides of the legs of the H-shaped switching contact are freely accessible to bring them into operative connection with the snap-action disc and in electrical contact with the conductor track of the printed circuit board.
  • the snap-action disc Since forces are occasionally introduced on the snap-action disc when they are actuated, which lead to stresses, torsions or shears within the snap-action disc, it is necessary to make the snap-action disc as flexible as possible in bending in order to absorb such obliquely introduced forces.
  • at least two spaced-apart ring segments are on the outer circumference of the snap-action disc molded, or attached, which are aligned in the direction of the circuit board. These ring segments form inwardly angled feet for the snap-action disc on the circuit board and are connected to this mechanically and electrically conductive, for example by means of a soldered seam.
  • recesses are incorporated in the ring segments, which extend either almost over the entire length of the ring segments and parallel to the circuit board or which may also be aligned perpendicular to the circuit board.
  • the configuration and arrangement of the recesses usually depends on the expected actuation forces and their respective direction of introduction of these loads.
  • the snap disc and the body can thus be used simultaneously both as a housing and as a button, without further actuation or encapsulation aids are required.
  • the snap disc is rather freely accessible from the outside, to generate the corresponding switching contact.
  • FIG. 1 is a switching device 1 can be seen, which serves from a mechanical movement or actuation of a snap-action disc 6, an electrical switching signal for controlling a machine tool, an electrical device or the like. Serves.
  • Such switching devices 1 often form a switching field with adjacently arranged switching devices.
  • a circuit board 4 is provided, in which a plurality of interconnects 5 are incorporated or printed on the switching device 1 facing surface.
  • the snap disk 6 is associated with a body 2 in which a switching contact 3 is installed such that the switching contact 3 protrudes both in the direction of the snap disk 6 and in the direction of the circuit board 4 from the body 2 ,
  • the area of the switching contact 3 facing the printed circuit board 4 is connected in a stationary manner to the interconnect 5 present there.
  • the bottom of the body 2 is arranged at a distance from the printed circuit board 4. In essence, the body 2 is parallel to the circuit board 4th
  • the body 2 is made of an insulating material, such as plastic, ceramic or glass, and has a thin-walled wall thickness.
  • the wall thickness of the body 2 is dimensioned larger in its outer region 15, as in the center of the body 2.
  • Such a contour can be configured for example as a concave curved plane or as a spherical surface.
  • the body 2 together with the snap-action disc 6 forms a housing; Namely, the snap-action disk 6 surrounds the outer region 15 of the body 2, so that the interior space enclosed by the snap-action disk 6 and the body 2 is encapsulated airtight or watertight to the outside.
  • the snap disc 6 is designed such that it is curved in the unactuated state to the outside.
  • the peripheral outer edge of the snap-action disc 6 is bent in the direction of the body 2 or in the direction of the printed circuit board 4 and is firmly connected to the outer circumferential surface 2 'of the body 2.
  • the switching contact 3 is configured in cross-section as an H-shaped body 16.
  • the two parallel legs of the body 16 are arranged on the top and bottom of the body 2 and the middle connecting the legs web is encased by the body 2. Consequently, the body 16 projects beyond the thin-walled plastic body 2 both in the direction of the snap disk 6 and in the direction of the printed circuit board 4.
  • the snap disk 6 is made of a flexurally elastic electrically conductive material, so that on the one hand in the operation of the snap 6 it is pressed in the direction of the switching contact 3 from an upper reversal point to a lower reversal point, whereby a spring tension within the snap disk 6 is formed, and other in the effective contact between the underside of the snap-action disc 6 and the top of the switching contact 2, an electrically conductive connection between the snap-action disc 6 and the switching contact 3 is formed.
  • the switching contact 3 consists of a ball 17 which is inserted in the designed as a plastic body bottom 2, that the wall thickness of the bottom 2 is dimensioned smaller than the diameter of the ball 17.
  • the ball 17 dominates the ground 2 both in the direction of the snap disk 6 and in the direction of the circuit board 4th
  • FIG. 2a can be seen that four ring segments are formed or worked on the snap disk 6 on the outer circumferential surface, which are aligned in pairs in opposite directions to each other.
  • the ring segments 11 project beyond the body 2 and protrude in the direction of the printed circuit board 4.
  • the body segments 2 superior ring segments 11 are electrically conductively attached to the circuit board 4.
  • the free ends of the ring segments, which extend immediately adjacent to the printed circuit board 4, are designed plan and are in electrically conductive connection with the conductor tracks 5. Consequently, the snap disc 6 is electrically connected to the conductor tracks 5 of the printed circuit board 4.
  • FIGS. 2a . 2 B and FIGS. 3 and 4 show that a recess 12 has been incorporated into the respective ring segment 11.
  • the longitudinal axis of the recess 12 is designated by the reference numeral 14 and extends parallel to the printed circuit board 4 and arcuately about the center 7 of the snap-action disc 6.
  • Due the provided recesses 12 may be such resilient, so that such stresses, torsional forces or shear forces not directly to the free end of the respective ring segments 11th Tensions, torsions or shear forces that may arise within the snap disk 6 due to an oblique force or an off-center force application are transferred and thereby possibly the mechanical connection between the ring segments 11 and the circuit board 4 is destroyed.
  • the switching contact 3 is designed as a ball 17, can be dispensed with the appropriate orientation of the ball 17 in the manufacturing process; in contrast, in the H-shaped body 16, attention must be paid to its positioning during manufacture.
  • Both variants of the switching contact 3 have in common that the body 2 enveloping the respective switching contact 3 is injection-molded around the body 16 or the ball 17, and that parts of the body 16 and the ball 17 protrude out of the body 2.
  • Both the body 16 and the ball 17 are in the center of the bottom 2, so to be aligned with the center 7 of the snap-action disc 6.
  • a passage opening is incorporated in the body 2.
  • the snap-action disc 6 has at its center 7 the largest possible stroke.
  • the distance between the surface of the body 16 or the ball 17 and the underside of the snap-action disc 6 is identified by the reference numeral 9. It is particularly advantageous if the distance 9 between the snap-action disc 6 and the respective switching contact 3 is dimensioned so large that it corresponds exactly to the maximum stroke of the snap-action disc 6, from an upper reversal point, as in FIG. 2a shown in a lower reversal point, as in FIG. 2b pictured, can be transferred.
  • the snap-action disc 6 has resilient properties, so that the snap-action disc 6 springs back automatically when an actuating force no longer acts on the snap-action disc 6.
  • FIG. 4 it can be seen that the snap disk 6 can also be pressed by means of an actuator 10.
  • a cover 13 made of plastic or rubber is glued or snapped, which is thus firmly connected to the snap-6. Furthermore, the coating 13 has an actuating head, which extends centrally and thus in alignment with the center 7 of the snap-action disk 6.
  • the actuator head is used for improved power consumption.

Landscapes

  • Switches With Compound Operations (AREA)
  • Push-Button Switches (AREA)

Description

Schaltvorrichtung und SchaltkontaktSwitching device and switching contact

Die Erfindung bezieht sich auf eine Schaltvorrichtung zur Umwandlung einer mechanischen Bewegung in ein elektrisches Schaltsignal nach dem Oberbegriff des Patentanspruches 1..The invention relates to a switching device for converting a mechanical movement into an electrical switching signal according to the preamble of claim 1 ..

Eine Schaltvorrichtung nach dem Oberbegriff des Anspruches 1 ist aus der EP 1 670 012 A2 bekannt.A switching device according to the preamble of claim 1 is known from EP 1 670 012 A2 known.

Derartige Schaltvorrichtungen sind seit vielen Jahren bekannt und werden in unterschiedlichen Anwendungen zur Steuerung von Werkzeugmaschinen, elektrischen Geräten und dgl. eingesetzt. Üblicherweise wird dabei die Schnappscheibe von einem Kunststoff-Gehäuse gekapselt. Das Kunststoff-Gehäuse wird im ZweiKomponenten-Spritzguss-Verfahren hergestellt und von den Patentanmeldern seit Jahren erfolgreich unter dem Produktnamen Racon ® vertrieben.Such switching devices have been known for many years and are used in various applications for controlling machine tools, electrical equipment and the like. Usually, the snap disk is encapsulated by a plastic housing. The plastic housing is manufactured using the two-component injection molding process and has been successfully sold by the patent applicants for years under the product name Racon®.

Das Kunststoff-Gehäuse weist zudem eine biegesteife als Traggestell dienende Außenkontur auf, in deren Zentrum auf der Oberseite des Gehäuses eine biegeelastische dünnwandige Kunststoffschicht vorhanden ist, die unmittelbar auf der Oberseite der Schnappscheibe im montiertem Zustand aufliegt und die als Membrane dient. Durch das Kunststoff-Gehäuse ist folglich der gesamte elektrische Schaltkontakt und die Schnappscheibe nach außen luftdicht verschlossen. Denn das Kunststoff-Gehäuse ist fest mit der Leiterplatte verbunden.The plastic housing also has a rigid as a support frame serving outer contour, in the center on the top of the housing a flexurally elastic thin-walled plastic layer is present, which rests directly on the top of the snap disk in the assembled state and which serves as a membrane. As a result of the plastic housing, the entire electrical switching contact and the snap-action disc are hermetically sealed to the outside. Because the plastic housing is firmly connected to the circuit board.

Bei solchen Schaltvorrichtungen handelt es sich um Massenartikel, da diese oftmals zur Ansteuerung einer Werkzeugmaschine in einer erheblichen Anzahl zu verbauen sind.Such switching devices are mass-produced articles, since they are often used to control a machine tool in considerable numbers.

Darüberhinaus ist es auch bekannt, die Schnappscheibe zur Vergrößerung des Hubweges mittels eines an der Innenseite der biegeelastischen Kunststoffschicht des Gehäuses angeordneten Stößel zu betätigen. Es ist auch bekannt, den Stößel an der Unterseite einer Tastenkappe anzuformen und die Tastenkappe in dem Kunststoff-Gehäuse linear zur Zustellung in Richtung der Schnappscheibe zu führen.Moreover, it is also known to actuate the snap disc to increase the stroke by means of a arranged on the inside of the flexurally elastic plastic layer of the housing plunger. It is also known to mold the plunger on the underside of a key cap and to guide the key cap in the plastic housing linearly for delivery in the direction of the snap disk.

Obwohl solche zusätzlichen Bedienhilfen in Form von Zwei-Komponenten-Kunststoff-Gehäuse bzw. Tastenkappen mit Stößel, die linear in einem Gehäuse geführt sind, die Produktionskosten erheblich erhöhen und obwohl solche Schnappscheiben seit mehreren Jahren in einer Vielzahl von unterschiedlichen Anwendungen benötigt sind, ist nachteiligerweise eine Lösung zur Senkung der Herstellungskosten unter Beibehaltung der gewünschten Funktionalitäten solcher Schaltvorrichtungen aus dem bekannten Stand der Technik nicht zu entnehmen.Although such additional operating aids in the form of two-component plastic housing or key caps with plunger, which are guided linearly in a housing, significantly increase the production costs and although such domes have been required for several years in a variety of different applications, is disadvantageous a solution for reducing the manufacturing cost while retaining the desired functionality of such switching devices from the prior art not apparent.

Es ist daher Aufgabe der Erfindung, eine Schaltvorrichtung der eingangs genannten Gattung derart zu vereinfachen, dass zur Betätigung und zur Kapselung der Schnappscheibe und des elektrischen Schaltkontaktes keine zusätzlichen Bauteile in Form von Kunststoff-Gehäusen oder Tastenkappen mit Betätigungsstößel notwendig sind.Desweiteren ist es Aufgabe der Erfindung, einen Schaltkontakt der eingangs genannten Gattung bereit zu stellen, der auf einfache und schnelle sowie kostengünstige Weise herstellbar bzw. montierbar ist.It is therefore an object of the invention to simplify a switching device of the type mentioned in such a way that for actuation and encapsulation of the snap disk and the electrical switching contact no additional components in the form of plastic housings or keycaps with actuating plunger are necessary.Desweiteren it is the task of Invention to provide a switching contact of the type mentioned, which is in a simple and fast and cost-effective manner produced or assembled.

Die Aufgabe zur verbesserten und vereinfachten Kapselung des elektrischen Schaltkontaktes ist durch die Merkmale des kennzeichnenden Teils von Patentanspruch 1 gelöst.The object of the improved and simplified encapsulation of the electrical switching contact is achieved by the features of the characterizing part of patent claim 1.

Weitere vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.Further advantageous developments of the invention will become apparent from the dependent claims.

Dadurch, dass die Schnappscheibe und der Körper ein luft- bzw. wasserdichtes Gehäuse bilden und dadurch dass die Schnappscheibe unmittelbar auf der Leiterplatte befestigt ist und mit dieser über die in der Leiterplatte integrierten oder aufgedruckten Leiterbahnen elektrisch leitfähig, beispielsweise mittels einer Lötnaht, verbunden ist, entsteht eine belastbare Schaltvorrichtung, bei der der Schaltkontakt durch die Schnappscheibe und den Körper gekapselt ist, da die Schnappscheibe den elektrischen Schaltkontakt gemeinsam mit dem Körper und der Leiterplatte luftdicht oder wasserdicht verschließt. Gleichzeitig ist die Schnappscheibe von außen zugänglich, um eine mechanische Betätigung in ein elektrisches Schaltsignal umzuwandeln. Eine zusätzliche Kapselung oder Befestigung der Schnappscheibe, beispielsweise durch ein Kunststoff-Gehäuse, entfällt vorteilhafterweise, so dass hierdurch Montage- und Herstellungskosten eingespart sind.Characterized in that the snap disc and the body form an air- or water-tight housing and characterized in that the snap disc is mounted directly on the circuit board and electrically conductive, for example by means of a soldered seam, connected thereto via the integrated or printed circuit boards in the circuit board, creates a resilient switching device in which the switching contact is encapsulated by the snap-action disc and the body, since the snap disc closes the electrical switching contact together with the body and the circuit board airtight or waterproof. At the same time, the snap-action disc is accessible from the outside in order to convert a mechanical actuation into an electrical switching signal. An additional encapsulation or attachment of the snap-action disc, for example by means of a plastic housing, is advantageously eliminated, so that in this way assembly and production costs are saved.

Darüberhinaus ist es besonders vorteilhaft, wenn der Schaltkontakt als Kugel ausgestaltet ist, denn eine Positionierung der Kugel in den Boden während des Herstellungsverfahrens im Spritzguss ist nicht notwendig. Lediglich die Wandstärke des die Kugel ummantelnden Körpers in Form eines Bodens ist an den Durchmesser der Kugel derart anzupassen, dass die Kugel an zwei gegenüberliegenden Seiten aus dem Körper übersteht, um für die Schnappscheibe zugänglich zu sein und um auf die Leiterbahn der Leiterplatte aufliegen zu können, so dass ein elektrisch leitfähiger Kontakt zwischen der aus einem elektrisch leitfähigen Werkstoff hergestellten Kugel und der jeweiligen Leiterbahn entsteht. Es ist dabei auch möglich, den elektrischen Schaltkontakt in seinem Querschnitt als H-förmigen elektrisch leitenden Körper auszugestalten. Der Boden der Schaltvorrichtung verläuft dabei zwischen den beiden parallelen Schenkeln des H-förmigen Schaltkontaktes. Die beiden Außenseiten der Schenkel des H-förmigen Schaltkontaktes sind dabei frei zugänglich, um diese in Wirkverbindung mit der Schnappscheibe und im elektrischen Kontakt mit der Leiterbahn der Leiterplatte zu bringen.Moreover, it is particularly advantageous if the switching contact is designed as a ball, because a positioning of the ball in the ground during the manufacturing process by injection molding is not necessary. Only the wall thickness of the body enclosing the ball in the form of a bottom is to be adapted to the diameter of the ball so that the ball protrudes on two opposite sides of the body to be accessible to the snap disk and to rest on the trace of the circuit board can , so that an electrically conductive contact between the ball made of an electrically conductive material and the respective conductor track is formed. It is also possible to design the electrical switching contact in its cross section as an H-shaped electrically conductive body. The bottom of the switching device extends between the two parallel legs of the H-shaped switching contact. The two outer sides of the legs of the H-shaped switching contact are freely accessible to bring them into operative connection with the snap-action disc and in electrical contact with the conductor track of the printed circuit board.

Da mitunter auf die Schnappscheibe bei deren Betätigung Kräfte eingeleitet sind, die innerhalb der Schnappscheibe zu Spannungen, Torsionen oder Scherungen führen, ist es erforderlich, die Schnappscheibe möglichst biegeelastisch auszugestalten, um solche schräg eingeleiteten Kräfte abzufedern. Zu diesem Zweck sind an den Außenumfang der Schnappscheibe mindestens zwei zueinander beabstandete Ringsegmente angeformt, bzw. angebracht, die in Richtung der Leiterplatte ausgerichtet sind. Diese Ringsegmente bilden nach innen abgewinkelte Standfüße für die Schnappscheibe auf der Leiterplatte und sind mit dieser, beispielsweise mittels einer Lötnaht, mechanisch und elektrisch leitend verbunden.Since forces are occasionally introduced on the snap-action disc when they are actuated, which lead to stresses, torsions or shears within the snap-action disc, it is necessary to make the snap-action disc as flexible as possible in bending in order to absorb such obliquely introduced forces. For this purpose, at least two spaced-apart ring segments are on the outer circumference of the snap-action disc molded, or attached, which are aligned in the direction of the circuit board. These ring segments form inwardly angled feet for the snap-action disc on the circuit board and are connected to this mechanically and electrically conductive, for example by means of a soldered seam.

Um den Spannungsabbau in diesen Ringsegmenten und damit der Schnappscheibe weiter zu erhöhen, sind in die Ringsegmente Aussparungen eingearbeitet, die entweder nahezu über die gesamte Länge der Ringsegmente und parallel zu der Leiterplatte verlaufen oder die auch senkrecht in Richtung der Leiterplatte ausgerichtet sein können. Die Ausgestaltung und Anordnung der Aussparungen hängt üblicherweise von den zu erwartenden Betätigungskräften und deren jeweiliger Einleitungsrichtung dieser Belastungen ab.In order to further increase the stress relief in these ring segments and thus the snap disk, recesses are incorporated in the ring segments, which extend either almost over the entire length of the ring segments and parallel to the circuit board or which may also be aligned perpendicular to the circuit board. The configuration and arrangement of the recesses usually depends on the expected actuation forces and their respective direction of introduction of these loads.

Durch die erfindungsgemäße Ausgestaltung und Anordnung der Schnappscheibe und des Körpers können diese somit sowohl als Gehäuse und als Taste gleichzeitig verwendet werden, ohne dass weitere Betätigungs- oder Kapselungshilfen erforderlich sind. Die Schnappscheibe ist vielmehr von außen frei zugänglich, um den entsprechenden Schaltkontakt zu generieren.Due to the inventive design and arrangement of the snap disc and the body, these can thus be used simultaneously both as a housing and as a button, without further actuation or encapsulation aids are required. The snap disc is rather freely accessible from the outside, to generate the corresponding switching contact.

In den Zeichnungen sind Beispiele einer Schnappscheibe und zwei verschiedene Ausgestaltungen von Schaltkontakten für eine Schaltvorrichtung abgebildet, die nachfolgend näher erläutert sind. Im Einzelnen zeigt:

Figur 1
eine Schaltvorrichtung mit einem in einem Körper eingesetzten im Querschnitt H-förmig ausgestalteten ersten Schaltkontakt, mit einer den Körper umgreifenden Schnappscheibe, durch die eine mechanische Betätigung in ein elektrisches Schaltsignal umgewandelt ist, und mit einer Leiterplatte, auf die die Schnappscheibe mit vier plan verlaufenden Ringsegmenten befestigt ist, im Schnitt,
Figur 2a
die Schaltvorrichtung gemäß Figur 1 mit einer zweiten Ausführungsvariante des Schaltkontaktes, der als Kugel ausgestaltet ist, im unbetätigten Zustand,
Figur 2b
die Schaltvorrichtung gemäß Figur 2a im betätigten Zustand,
Figur 2c
die Schaltvorrichtung gemäß Figur 1 mit vier nach außen abgewinkelten Ringsegmenten,
Figur 2d
eine erfindungsgemäße Schnappscheibe nach Figur 1 mit vier nach innen abgewinkelten Ringsegmenten
Figur 3
die Schaltvorrichtung gemäß Figur 1, in Draufsicht und
Figur 4
die Schaltvorrichtung gemäß Figur, 1 in Seitenansicht
In the drawings, examples of a snap-action disc and two different embodiments of switching contacts for a switching device are shown, which are explained in more detail below. In detail shows:
FIG. 1
a switching device with a used in a body in cross-section H-shaped first switching contact, with a body surrounding the snap disc, by which a mechanical actuation is converted into an electrical switching signal, and with a circuit board to which the snap disc with four planar ring segments is attached, on average,
FIG. 2a
the switching device according to FIG. 1 with a second embodiment of the switching contact, which is designed as a ball, in the unactuated state,
FIG. 2b
the switching device according to FIG. 2a in the actuated state,
Figure 2c
the switching device according to FIG. 1 with four outwardly angled ring segments,
Figure 2d
a snap disk according to the invention FIG. 1 with four inwardly angled ring segments
FIG. 3
the switching device according to FIG. 1 , in top view and
FIG. 4
the switching device according to FIG. 1 in side view

In Figur 1 ist eine Schaltvorrichtung 1 zu entnehmen, die dazu dient aus einer mechanischen Bewegung bzw. Betätigung einer Schnappscheibe 6 ein elektrisches Schaltsignal zur Steuerung einer Werkzeugmaschine, eines elektrischen Gerätes oder dgl. dient. Solche Schaltvorrichtungen 1 bilden oftmals ein Schaltfeld mit benachbart angeordneten Schaltvorrichtungen.In FIG. 1 is a switching device 1 can be seen, which serves from a mechanical movement or actuation of a snap-action disc 6, an electrical switching signal for controlling a machine tool, an electrical device or the like. Serves. Such switching devices 1 often form a switching field with adjacently arranged switching devices.

Um die von den jeweiligen Schaltvorrichtungen 1 erzeugten elektrischen Schaltsignale an die Werkzeugmaschine oder das technische Gerät zu übertragen, ist eine Leiterplatte 4 vorgesehen, in der eine Vielzahl von Leiterbahnen 5 eingearbeitet sind bzw. auf der der Schaltvorrichtung 1 zugewandten Oberfläche aufgedruckt sind.In order to transmit the electrical switching signals generated by the respective switching devices 1 to the machine tool or the technical device, a circuit board 4 is provided, in which a plurality of interconnects 5 are incorporated or printed on the switching device 1 facing surface.

Um die mechanischen Zustellbewegungen in die elektrischen Schaltsignale umzuwandeln, ist der Schnappscheibe 6 ein Körper 2 zugeordnet, in dem ein Schaltkontakt 3 derart eingebaut ist, dass der Schaltkontakt 3 sowohl in Richtung der Schnappscheibe 6 als auch in Richtung der Leiterplatte 4 aus dem Körper 2 übersteht. Zudem ist der der Leiterplatte 4 zugewandte Bereich des Schaltkontaktes 3 ortsfest mit der dort vorhandenen Leiterbahn 5 verbunden. Die Unterseite des Körpers 2 ist beabstandet zu der Leiterplatte 4 angeordnet. Im Wesentlichen verläuft der Körper 2 parallel zu der Leiterplatte 4.In order to convert the mechanical feed movements in the electrical switching signals, the snap disk 6 is associated with a body 2 in which a switching contact 3 is installed such that the switching contact 3 protrudes both in the direction of the snap disk 6 and in the direction of the circuit board 4 from the body 2 , In addition, the area of the switching contact 3 facing the printed circuit board 4 is connected in a stationary manner to the interconnect 5 present there. The bottom of the body 2 is arranged at a distance from the printed circuit board 4. In essence, the body 2 is parallel to the circuit board 4th

Der Körper 2 ist aus einem isolierenden Werkstoff, beispielsweise Kunststoff, Keramik oder Glas, hergestellt und weist eine dünnwandige Wandstärke auf. Zudem ist die Wandstärke des Körpers 2 in dessen Außenbereich 15 größer bemessen, als im Zentrum des Körpers 2. Eine solche Kontur kann beispielsweise als konkav gekrümmte Ebene oder als sphärische Fläche ausgestaltet sein.The body 2 is made of an insulating material, such as plastic, ceramic or glass, and has a thin-walled wall thickness. In addition, the wall thickness of the body 2 is dimensioned larger in its outer region 15, as in the center of the body 2. Such a contour can be configured for example as a concave curved plane or as a spherical surface.

Darüberhinaus bildet der Körper 2 gemeinsam mit der Schnappscheibe 6 ein Gehäuse; die Schnappscheibe 6 umgreift nämlich den Außenbereich 15 des Körpers 2, so dass der von der Schnappscheibe 6 und dem Körper 2 eingeschlossene Innenraum nach außen luftdicht oder wasserdicht gekapselt ist.Moreover, the body 2 together with the snap-action disc 6 forms a housing; Namely, the snap-action disk 6 surrounds the outer region 15 of the body 2, so that the interior space enclosed by the snap-action disk 6 and the body 2 is encapsulated airtight or watertight to the outside.

Die Schnappscheibe 6 ist derart ausgestaltet, dass diese in unbetätigtem Zustand nach außen gewölbt ist. Die umlaufende Außenkante der Schnappscheibe 6 ist in Richtung des Körpers 2 bzw. in Richtung der Leiterplatte 4 gebogen und ist fest mit der Außenmantelfläche 2' des Körpers 2 verbunden.The snap disc 6 is designed such that it is curved in the unactuated state to the outside. The peripheral outer edge of the snap-action disc 6 is bent in the direction of the body 2 or in the direction of the printed circuit board 4 and is firmly connected to the outer circumferential surface 2 'of the body 2.

In Figur 1 ist der Schaltkontakt 3 im Querschnitt als H-förmiger Körper 16 ausgestaltet. Dabei sind die beiden parallel verlaufenden Schenkel des Körpers 16 auf der Ober- und Unterseite des Körpers 2 angeordnet und der mittlere die Schenkel verbindende Steg wird von dem Körper 2 ummantelt. Folglich überragt der Körper 16 den dünnwandigen Kunststoff-Körper 2 sowohl in Richtung der Schnappscheibe 6 als auch in Richtung der Leiterplatte 4.In FIG. 1 the switching contact 3 is configured in cross-section as an H-shaped body 16. In this case, the two parallel legs of the body 16 are arranged on the top and bottom of the body 2 and the middle connecting the legs web is encased by the body 2. Consequently, the body 16 projects beyond the thin-walled plastic body 2 both in the direction of the snap disk 6 and in the direction of the printed circuit board 4.

Die Schnappscheibe 6 ist aus einem biegeelastischen elektrisch leitfähigen Werkstoff hergestellt, so dass zum einen bei der Betätigung der Schnappscheibe 6 diese in Richtung des Schaltkontaktes 3 von einem oberen Umkehrpunkt zu einem unteren Umkehrpunkt gedrückt wird, wodurch eine Federspannung innerhalb der Schnappscheibe 6 entsteht, und zum anderen bei dem Wirkkontakt zwischen der Unterseite der Schnappscheibe 6 und der Oberseite des Schaltkontaktes 2 eine elektrisch leitende Verbindung zwischen der Schnappscheibe 6 und dem Schaltkontakt 3 entsteht.The snap disk 6 is made of a flexurally elastic electrically conductive material, so that on the one hand in the operation of the snap 6 it is pressed in the direction of the switching contact 3 from an upper reversal point to a lower reversal point, whereby a spring tension within the snap disk 6 is formed, and other in the effective contact between the underside of the snap-action disc 6 and the top of the switching contact 2, an electrically conductive connection between the snap-action disc 6 and the switching contact 3 is formed.

Aus Figur 2a ist ersichtlich, dass der Schaltkontakt 3 aus einer Kugel 17 besteht, die derart in dem als Kunststoff-Körper ausgestalteten Boden 2 eingesetzt ist, dass die Wandstärke des Bodens 2 kleiner bemessen ist als der Durchmesser der Kugel 17. Somit überragt die Kugel 17 den Boden 2 sowohl in Richtung der Schnappscheibe 6 als auch in Richtung der Leiterplatte 4.Out FIG. 2a It can be seen that the switching contact 3 consists of a ball 17 which is inserted in the designed as a plastic body bottom 2, that the wall thickness of the bottom 2 is dimensioned smaller than the diameter of the ball 17. Thus, the ball 17 dominates the ground 2 both in the direction of the snap disk 6 and in the direction of the circuit board 4th

Desweiteren ist Figur 2a zu entnehmen, dass an der Schnappscheibe 6 an deren Außenmantelfläche vier Ringsegmente angeformt bzw. angearbeitet sind, die jeweils paarweise fluchtend gegenüberliegend zueinander ausgerichtet sind. Die Ringsegmente 11 überragen dabei den Körper 2 und stehen in Richtung der Leiterplatte 4 ab. Mittels einer Lötnaht 19 sind die den Körper 2 überragenden Ringsegmente 11 an der Leiterplatte 4 elektrisch leitend befestigt. Die freien Enden der Ringsegmente, die unmittelbar benachbart zu der Leiterplatte 4 verlaufen, sind plan ausgestaltet und stehen in elektrisch leitender Verbindung mit den Leiterbahnen 5. Folglich ist die Schnappscheibe 6 elektrisch mit den Leiterbahnen 5 der Leiterplatte 4 verbunden. Sobald, wie in Figur 2b gezeigt, die Schnappscheibe aus der unbetätigten Stellung nach Figur 2a in Wirkkontakt mit der Kugel 17 bzw. einem beliebig ausgestalteten Schaltkontakt 3 gelangt, entsteht ein Kurzschluss, wodurch das elektrische Schaltsignal generiert ist.Furthermore is FIG. 2a can be seen that four ring segments are formed or worked on the snap disk 6 on the outer circumferential surface, which are aligned in pairs in opposite directions to each other. The ring segments 11 project beyond the body 2 and protrude in the direction of the printed circuit board 4. By means of a solder seam 19, the body segments 2 superior ring segments 11 are electrically conductively attached to the circuit board 4. The free ends of the ring segments, which extend immediately adjacent to the printed circuit board 4, are designed plan and are in electrically conductive connection with the conductor tracks 5. Consequently, the snap disc 6 is electrically connected to the conductor tracks 5 of the printed circuit board 4. Once, as in FIG. 2b shown, the snap disc from the unactuated position after FIG. 2a comes into operative contact with the ball 17 and an arbitrarily designed switching contact 3, a short circuit, whereby the electrical switching signal is generated.

In den Figuren 2c und 2d ist eine konstruktive abgewandelte Variation der Ringsegmente 11 zu entnehmen. Die der Leiterplatte 4 zugewandten freien Enden der Ringsegmente 11 sind nunmehr gemäß Figur 2c nach außen und gemäß Figur 2d nach innen abgewinkelt. Die freien Enden der Ringsegmente 11 sind nach innen abgewinkelt, so stehen diese von dem Körper 2 nicht ab, sondern umgreifen diesen, so dass Platz eingespart und der Körper 2 von der Schnappscheibe 6 umgriffen ist. Die abgewinkelten freien Enden der Ringsegmente 11 liegen demnach flächig auf der Leiterbahn 5 auf und sind mit dieser, beispielsweise mittels einer Lötnaht 19, fest verbunden.In the Figures 2c and 2d is a constructive modified variation of the ring segments 11 refer. The printed circuit board 4 facing free ends of the ring segments 11 are now according to Figure 2c outward and according to Figure 2d angled inwards. The free ends of the ring segments 11 are angled inward, so they do not depend on the body 2, but embrace this, so that saves space and the body 2 is encompassed by the snap disk 6. The angled free ends of the ring segments 11 are therefore flat on the conductor 5 and are fixedly connected to this, for example by means of a solder seam 19.

Desweiteren ist den Figuren 2a, 2b sowie 3 und 4 zu entnehmen, dass in das jeweilige Ringsegment 11 eine Aussparung 12 eingearbeitet ist. Die Längsachse der Aussparung 12 ist mit der Bezugsziffer 14 gekennzeichnet und verläuft parallel zu der Leiterplatte 4 bzw. bogenförmig um den Mittelpunkt 7 der Schnappscheibe 6. Aufgrund der vorgesehenen Aussparungen 12 können Spannungen, Torsionen oder Scherkräfte, die innerhalb der Schnappscheibe 6 aufgrund einer schrägen Krafteinleitung oder eine außermittigen Krafteinleitung entstehen können, derart federnd abgebaut sein, dass solche Spannungen, Torsionskräfte bzw. Scherkräfte nicht unmittelbar an das freie Ende der jeweiligen Ringsegmente 11 übertragen sind und dadurch möglicherweise die mechanische Verbindung zwischen den Ringsegmenten 11 und der Leiterplatte 4 zerstört ist.Furthermore, the FIGS. 2a . 2 B and FIGS. 3 and 4 show that a recess 12 has been incorporated into the respective ring segment 11. The longitudinal axis of the recess 12 is designated by the reference numeral 14 and extends parallel to the printed circuit board 4 and arcuately about the center 7 of the snap-action disc 6. Due the provided recesses 12 may be such resilient, so that such stresses, torsional forces or shear forces not directly to the free end of the respective ring segments 11th Tensions, torsions or shear forces that may arise within the snap disk 6 due to an oblique force or an off-center force application are transferred and thereby possibly the mechanical connection between the ring segments 11 and the circuit board 4 is destroyed.

Wenn der Schaltkontakt 3 als Kugel 17 ausgestaltet ist, kann auf die entsprechende Ausrichtung der Kugel 17 bei dem Herstellungsverfahren verzichtet werden; im Gegensatz dazu ist bei dem H-förmigen Körper 16 exakt auf dessen Positionierung während der Herstellung zu achten. Beiden Ausführungsvarianten des Schaltkontaktes 3 ist gemeinsam, dass der den jeweiligen Schaltkontakt 3 ummantelnde Körper 2 im Spritzgussverfahren um den Körper 16 bzw. die Kugel 17 gespritzt ist, und dass Teile des Körpers 16 bzw. der Kugel 17 aus dem Körper 2 überstehen. Sowohl der Körper 16 als auch die Kugel 17 sind dabei im Mittelpunkt des Bodens 2, also fluchtend zu dem Mittelpunkt 7 der Schnappscheibe 6 anzuordnen. Zu diesem Zweck ist in den Körper 2 eine Durchgangsöffnung eingearbeitet.If the switching contact 3 is designed as a ball 17, can be dispensed with the appropriate orientation of the ball 17 in the manufacturing process; in contrast, in the H-shaped body 16, attention must be paid to its positioning during manufacture. Both variants of the switching contact 3 have in common that the body 2 enveloping the respective switching contact 3 is injection-molded around the body 16 or the ball 17, and that parts of the body 16 and the ball 17 protrude out of the body 2. Both the body 16 and the ball 17 are in the center of the bottom 2, so to be aligned with the center 7 of the snap-action disc 6. For this purpose, a passage opening is incorporated in the body 2.

Die Schnappscheibe 6 weist nämlich in ihrem Mittelpunkt 7 den größtmöglichen Hubweg auf. Der Abstand zwischen der Oberfläche des Körpers 16 bzw. der Kugel 17 und der Unterseite der Schnappscheibe 6 ist mit der Bezugsziffer 9 gekennzeichnet. Es ist besonders vorteilhaft, wenn der Abstand 9 zwischen der Schnappscheibe 6 und dem jeweiligen Schaltkontakt 3 derart groß bemessen ist, dass dieser exakt den maximalen Hubweg der Schnappscheibe 6 entspricht, die von einem oberen Umkehrpunkt, wie in Figur 2a dargestellt, in einen unteren Umkehrpunkt, wie in Figur 2b abgebildet, überführt werden kann. Die Schnappscheibe 6 weist federnde Eigenschaften auf, so dass die Schnappscheibe 6 selbstständig zurückfedert, wenn eine Betätigungskraft auf die Schnappscheibe 6 nicht länger einwirkt.Namely, the snap-action disc 6 has at its center 7 the largest possible stroke. The distance between the surface of the body 16 or the ball 17 and the underside of the snap-action disc 6 is identified by the reference numeral 9. It is particularly advantageous if the distance 9 between the snap-action disc 6 and the respective switching contact 3 is dimensioned so large that it corresponds exactly to the maximum stroke of the snap-action disc 6, from an upper reversal point, as in FIG. 2a shown in a lower reversal point, as in FIG. 2b pictured, can be transferred. The snap-action disc 6 has resilient properties, so that the snap-action disc 6 springs back automatically when an actuating force no longer acts on the snap-action disc 6.

Aus Figur 4 kann entnommen werden, dass die Schnappscheibe 6 auch mittels eines Betätigers 10 eingedrückt werden kann.Out FIG. 4 it can be seen that the snap disk 6 can also be pressed by means of an actuator 10.

Auf die Schnappscheibe 6 nach Figur 1 ist ein Überzug 13 aus Kunststoff oder Gummi aufgeklebt oder aufgerastet, der somit fest mit der Schnappscheibe 6 verbunden ist. Desweiteren weist der Überzug 13 einen Betätigungskopf auf, der zentrisch und somit fluchtend zu dem Mittelpunkt 7 der Schnappscheibe 6 verläuft.On the snap 6 after FIG. 1 a cover 13 made of plastic or rubber is glued or snapped, which is thus firmly connected to the snap-6. Furthermore, the coating 13 has an actuating head, which extends centrally and thus in alignment with the center 7 of the snap-action disk 6.

Der Betätigungskopf dient zur verbesserten Kraftaufnahme.The actuator head is used for improved power consumption.

Claims (13)

  1. A switch device (1) for converting a mechanical movement into an electrical switch signal, consisting of an electrical switch contact (3), a circuit board (4) which is electrically connected to the switch contact (3),
    characterised in that,,
    a snap disc (6) comprising a flexibly elastic and electrically conductive material and a thin-walled body (2) form a housing by means of which the electrical switch contact (3) is encapsulated so as to be air or water-tight, that at least two ring segments (11) are formed on or attached to the snap disc (6), the free end of which ring segments (11) facing the circuit board (4) is firmly connected to it in an electrically conductive connection, and that the snap disc (6) encloses the outside edge (15) of the body (2).
  2. The switch device in accordance with Claim 1,
    characterised in that,
    the snap disc (6) and the body (2) are firmly connected together by means of an injection moulding process and that the body (2) consists of an insulating material, preferably plastic, ceramic or glass.
  3. The switch device in accordance with Claim 1 or 2,
    characterised in that,
    the ring segments (11) are spaced apart from one another, and that the free ends of the ring segments (11) are angled towards the inside and are in direct electrical contact with a via (5) of the circuit board (4) and in a preferred embodiment they are soldered on.
  4. The switch device in accordance with Claim 3,
    characterised in that,
    at least one recess (12) is worked into the ring segments (11) for increasing the elasticity of the snap disc (6).
  5. The switch device in accordance with Claim 4,
    characterised in that,
    the longitudinal axis (14) of the recess (12) in question is aligned at right angles or parallel to the circuit board (4).
  6. The switch device in accordance with one of the aforementioned claims,
    characterised in that,
    the body (2) is arranged at a distance from the circuit board (4) and that the outer edge area of the body (2) has a greater wall thickness than the centre of the body (2).
  7. The switch device in accordance with one of the aforementioned claims,
    characterised in that,
    the snap disc (6) is covered with a flexible elastic covering (13), preferably
    made from plastic, rubber or a plastic/rubber blend.
  8. The switch device in accordance with one of the aforementioned claims,
    characterised in that,
    a passage opening (20) is worked into the body (2), in a preferred embodiment in its centre.
  9. The switch device in accordance with one of the aforementioned claims,
    characterised in that,
    the cross section of the switch contact (3) is a H-shaped body (16) or a ball (17) or a hemisphere, that the particular switch contact (3) is manufactured from an electrically conductive material and that the switch contact (3) projects from the body (2) of the switching device (1) in the direction of the snap disc (6) and the circuit board (4) and is electrically connected to the circuit board (4) or electrically interacts with the snap disc (6) to establish contact.
  10. The switch device in accordance with Claim 9,
    characterised in that,
    the body (2) reaches around or encloses the spherical switch contact (17) in its central plane (18) in a ring shape.
  11. The switch device in accordance with Claim 9 or 10,
    characterised in that,
    the distance (9) between the unactuated snap disc (6) and the upper side of the switch contact (3, 16, 17) facing the snap disc (6) is sized so that the stroke length which the snap disc (6) covers from the top to the bottom reversing point corresponds to this distance (9).
  12. The switch device in accordance with one of the aforementioned claims,
    characterised in that,
    the centre point (7) of the snap disc (6) is aligned flush with the geometrical centre point (8) of the switch contact (3, 16, 17).
  13. The switch device in accordance with one of the aforementioned claims,
    characterised in that,
    a plastic or rubber covering (13) is glued or snapped onto the top side of the snap disc (6) and/or that an actuation head is formed onto the surface of a covering (13) which is at a distance from the snap disc (6).
EP12161463.0A 2012-03-27 2012-03-27 Switch device and switch contact Active EP2645391B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12161463.0A EP2645391B1 (en) 2012-03-27 2012-03-27 Switch device and switch contact

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12161463.0A EP2645391B1 (en) 2012-03-27 2012-03-27 Switch device and switch contact

Publications (2)

Publication Number Publication Date
EP2645391A1 EP2645391A1 (en) 2013-10-02
EP2645391B1 true EP2645391B1 (en) 2016-10-12

Family

ID=46027577

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12161463.0A Active EP2645391B1 (en) 2012-03-27 2012-03-27 Switch device and switch contact

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Country Link
EP (1) EP2645391B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3084793B1 (en) 2013-12-19 2017-11-22 Eaton Electrical IP GmbH & Co. KG Contact element
EP3046126B1 (en) 2015-01-14 2018-10-10 RAFI GmbH & Co. KG Switching device
EP3244430B1 (en) * 2016-05-09 2018-08-29 RAFI GmbH & Co. KG Device for converting mechanical movements into an electrical switching signal

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5849546Y2 (en) * 1979-11-15 1983-11-11 松下電器産業株式会社 push-on switch
US4924046A (en) * 1988-09-27 1990-05-08 Delta Systems, Inc. Trim switch
US5898147A (en) * 1997-10-29 1999-04-27 C & K Components, Inc. Dual tact switch assembly
DE19823894C1 (en) * 1998-04-18 2000-01-05 Inovan Stroebe Snap disc switch with fastener
JP4371987B2 (en) * 2004-12-07 2009-11-25 ホシデン株式会社 Push-on switch
DE102009022687B3 (en) * 2009-03-12 2010-07-08 Erbe Elektromedizin Gmbh Sensing device e.g. electrically operated diagnostic and therapeutic instrument, has switching spring-counter contact projected in hollow space below switching spring and guided opposite to housing part through another housing part

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