EP3734629B1 - Switching device - Google Patents
Switching device Download PDFInfo
- Publication number
- EP3734629B1 EP3734629B1 EP19172270.1A EP19172270A EP3734629B1 EP 3734629 B1 EP3734629 B1 EP 3734629B1 EP 19172270 A EP19172270 A EP 19172270A EP 3734629 B1 EP3734629 B1 EP 3734629B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductor tracks
- snap
- action disc
- action
- switching
- 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.)
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- 239000004020 conductor Substances 0.000 claims description 82
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 239000012777 electrically insulating material Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000284 resting effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Images
Classifications
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- 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
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/78—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites
- H01H13/807—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by the contacts or the contact sites characterised by the spatial arrangement of the contact sites, e.g. superimposed sites
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2203/00—Form of contacts
- H01H2203/036—Form of contacts to solve particular problems
- H01H2203/038—Form of contacts to solve particular problems to be bridged by a dome shaped contact
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2203/00—Form of contacts
- H01H2203/036—Form of contacts to solve particular problems
- H01H2203/044—Form of contacts to solve particular problems to achieve a predetermined sequence of switching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2203/00—Form of contacts
- H01H2203/056—Cuts or depressions in support, e.g. to isolate contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2205/00—Movable contacts
- H01H2205/016—Separate bridge contact
- H01H2205/024—Means to facilitate positioning
- H01H2205/028—Protuberances on substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/004—Collapsible dome or bubble
- H01H2215/012—Positioning of individual dome
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/004—Collapsible dome or bubble
- H01H2215/014—Avoiding permanent dome inversion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/004—Collapsible dome or bubble
- H01H2215/016—Collapsing to second stable position
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/004—Collapsible dome or bubble
- H01H2215/018—Collapsible dome or bubble unstressed in open position of switch
Definitions
- the invention relates to a switching device as an interface for an electrically operated machine tool or other electrical device and a human for converting a mechanical infeed movement into an electrical switching signal according to the preamble of patent claim 1.
- switching devices have proven themselves in the past as an interface between people and electrically operated devices or machine tools, since they reliably generate control signals when a mechanical infeed movement occurs on them.
- the structural design and operation of such switching devices can, for example, from EP 1 750 291 B1 be removed.
- the switching devices consist of a housing in which a printed circuit board with contact or conductor tracks is present. One or more recesses are incorporated into the housing. A snap-action disk made of an electrically conductive material, which is under prestress, is inserted into the respective recess.
- Such snap-action disks are in particular curved outwards in the shape of a dome, so that the snap-action disks protrude from the plane formed by the housing surface and are consequently freely accessible from the outside and can consequently be actuated mechanically.
- the outwardly protruding contours of the snap disks can be covered by safety mats or other actuating elements.
- the contour of the switch surface is both tactile and visually recognizable.
- buttons can be assigned a specific control function, which is recognizable to the respective person as the user by means of appropriately designed symbols or inscriptions.
- a printed circuit board which has two switching contacts. These switching contacts usually protrude from the plane formed by the printed circuit board in the direction of the snap disks. As soon as the snap-action disc is bent in the direction of the printed circuit board by a corresponding mechanical feed force acting on it, the underside of the snap-action disc bridges the distance between the two switching contacts of the printed circuit board. This results in an electrical short circuit, which generates an electrical switching signal and forwards it to a machine tool or other electrical device for control.
- the switching contacts are therefore arranged in the area of the maximum bulge of the snap-action disk and run directly aligned below the bulge of the snap-action disk. As soon as the manual feed force is no longer acting on the snap-action disc, the snap-action disc springs back into its starting position due to the preload force stored in it.
- a disadvantage of this structural design has been found to be that a snap-action disc can only generate an electrical switching signal, because the snap-action disc either bridges the distance between the two switching contacts and thereby generates the switching signal, or the snap-action disc is lifted or spaced apart from the two switching contacts that this electrical contact is open.
- the DE 2531841 A1 discloses a snap-action switch with an elastic sheet, which snaps over from a stable position to a metastable position when subjected to compressive stress by an actuating member, thereby closing or opening contacts.
- outer conductors In the unactuated state, outer conductors are electrically connected, whereas in the actuated state one of the outer conductors is electrically connected to another, inner conductor. Since one of the outer conductors is part of a closed circuit both in the unactuated and in the actuated state, there is no complete separation of the circuits.
- the U.S. 2011/233037 A1 discloses a switching device with an elastic actuating disc which can be converted from an unactuated state to an actuated state.
- conductive contact rings are electrically connected via the actuating disk and the circuit is closed by the ends of the actuating disk resting on the outer contact ring and radially inwardly offset support legs on the underside of the actuating disk resting on the inner contact ring.
- the ends of the actuating disc are lifted away from the outer contact ring, breaking the circuit.
- the support legs on the underside of the actuating disk have both the function of a current-conducting element and the function of an abutment.
- the invention is therefore based on the object of further developing a switching device of the type mentioned at the outset in such a way that at least two electrical control signals can be generated by means of a snap-action disc.
- This respective short circuit can be detected by a control device and converted into an electrical switching signal.
- a control device When not actuated, there is therefore electrical contact between the outer conductor tracks and the legs located in the corner areas of the snap-action disc, whereas when the snap-action disc is actuated by lifting the legs from the outer conductor tracks, this contact opens, while the contact opens due to the snap-action disc swinging through closes the middle traces and thus shorts the two middle traces across their separation in the center.
- the printed circuit board consists of four spatially separated conductor tracks which have the corresponding arrangement of switching contacts and if support bodies are arranged between the switching contacts of the first, second and the third or fourth conductor tracks and between the center of the housing and the edge of the housing at right angles to the conductor tracks , on which the snap-action disc rests like a seesaw, then either the edge areas of the snap-action disc lift off the respective outer conductor tracks when pushed through and the two switching contacts provided in the center are short-circuited by the snap-action disc or the snap-action disc short-circuits the outer conductor tracks when not actuated , since these on the respective Traces rests, so that each snap-action disc thereby generates two different switching signals.
- the printed circuit board and its four conductor tracks are particularly advantageous to produce as a pressed screen from an electrically conductive material and then to encapsulate or encapsulate this pressed screen by means of an electrically insulating material, for example plastic. It is important to ensure that areas of the conductor tracks that face the subsequently installed snap disks are not covered by the insulating material, but rather are freely accessible. This is because these freely accessible areas of the conductor tracks serve as switching contacts for the snap-action disks and for generating the respective short circuits.
- the stamped grid overmoulded in this way can be manufactured cost-effectively and precisely, because its overmoulding creates the housing and the receiving opening required for receiving the snap-action disks, into which the respective snap-action disk is inserted and locked in a position-oriented manner.
- a switching device 1 can be seen as an interface for an electrically operated machine tool (not shown) or other electrical device and a human for converting a mechanical infeed movement 2 into an electrical switching signal.
- the device 1 consists of a housing 3 and an essentially rectangular recess 4 worked into this.
- a snap-action disc 9 made of an electrically conductive material is arranged between the actuating element 5 and the closed lower side of the housing 3 .
- the snap disk 9 has a dome-shaped bulge, which is designed in the direction of the actuating element 5 and interacts with it as explained in more detail below.
- the snap-action disk 9 has legs designed like a dome in the outside area. The bulge of the snap disk 9 protrudes beyond the outside area or the legs.
- the housing 4 supports four conductor tracks 21, 22, 23 and 24.
- the two outer first and second conductor tracks 21 and 22 run both parallel to one another and parallel to the two opposite walls of the recess 4.
- the snap-action disc 9 rests in the corner areas 15 with its legs on the outer conductor tracks 21, 22 and thus forms with the outer two conductor tracks 21 and 22 a closed electrical contact defined as the first electrical circuit.
- the conductor tracks 21, 22, 23 and 24 lie in a common plane.
- the two inner third and fourth conductor tracks 23 and 24 which are spatially separate from one another and are spaced apart from one another in the region of the center 6 of the recess 4 .
- the two conductor tracks 23 and 24 each have a switching contact 13, which each interact with the snap-action disk 9 when the bulge of the snap-action disk 9 is moved or rotated in the direction of the center 6.
- the distance between the two switching contacts 13 is consequently bridged by the snap disk 9 and a short circuit occurs. This switching state is defined as the second switching circuit.
- Supporting bodies 25 and 26 are arranged perpendicular to the conductor tracks 21, 22, 23 and 24, respectively.
- the supporting bodies 25 and 26 are each designed as a web which is formed on or fastened to the inner wall of the recess 4 .
- the support bodies 25 and 26 run perpendicular to the four conductor tracks 21, 22, 23 and 24.
- the support bodies 25 and 26 are arranged between the snap-action disc 9 and the conductor tracks 21, 22, 23 and 24.
- the respective movement of the snap disk 9 can be taken as a function of the manual feed forces acting on it.
- the snap disk 9 is in its initial position and a manual feed force 2 does not act on it.
- the legs of the snap-action disc 9 lie in the corner areas 15 of the recess 4 on the two outer first and second conductor tracks 21 and 22 so that the respective first and second conductor tracks 21 and 22 are electrically short-circuited by the snap-action disc 9 .
- This electrical switching state can be picked up via an electrical contact, such as a soldering connection 14, in the outer area of the housing 4 at the ends of the conductor tracks 21, 22, 23, 24 that lead to the outside and forwarded to a control device (not shown) for switching an electrical device and evaluated and converted there.
- an electrical contact such as a soldering connection 14
- a control device not shown
- the snap-action disc 9 As soon as a mechanical advancing force, for example by a human finger, acts on the snap-action discs 9 or the externally accessible actuating element 5 , the snap-action disc 9 is bent in the direction of the two inner third and fourth conductor tracks 23 and 24 .
- the two supporting bodies 25 and 26 accordingly form a rotating or supporting surface for the snap-action disk 9, whereby the movement of the snap-action disk 9 in the direction of the two inner conductor tracks 23 and 24 is not impeded and at the same time the outer edge regions of the snap-action disk 9 in the corner regions 15 is lifted from the outer conductor tracks 21 and 22.
- Such a movement can also be seen as a kind of see-saw in the technical sense.
- a corresponding projection in the form of a bulge or dome can be provided on the underside of the snap-action disc 9 in its central area.
- FIG 4 A particularly cost-effective manufacturing method for the printed circuit board 10 is shown.
- the circuit board 10 consists of a pressed screen 20 made of electrically conductive material. Consequently, the four conductor tracks 21, 22, 23 and 24 are first to be positioned in a mold 19 in a position-oriented manner and are then encapsulated or encapsulated by means of a liquid plastic material 18 .
- the mold 19 is designed in such a way that on the one hand the housing 3 with the recess 4 is formed and on the other hand certain areas of the conductor tracks 21, 22, 23 and 24 are not covered by the electrically insulating plastic 18, ie are freely accessible.
- buttons 12 and 13 serve as buttons 12 and 13 for the switching device 1 according to the invention, because the snap-action disc 9 lies on the buttons 12 of the two outer conductor tracks 21 and 22 in the non-actuated state - as above explained - and when the snap-action disc 9 is moved by the manual feed force 2 in the direction of the two inner conductor tracks 23 and 24, the outer areas of the snap-action disc 9 lift off the buttons 12 and at the same time come into an operative electrical connection with the buttons or Contacts 13 of the two inner conductor tracks 23 and 24 .
- the supporting bodies 25 and 26 can be produced at the same time.
- the support bodies 25 and 26 run between the respective buttons 12 of the two outer conductor tracks 21 and 22 and the two buttons 13 of the inner conductor tracks 23 and 24 and are approximately the same distance from the respective buttons 12 and 13 .
Description
Die Erfindung bezieht sich auf eine Schalt-Vorrichtung als Schnittstelle für eine elektrisch betriebene Werkzeugmaschine oder ein sonstiges elektrisches Gerät und einem Menschen zur Umwandlung einer mechanischen Zustellbewegung in ein elektrisches Schaltsignal nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a switching device as an interface for an electrically operated machine tool or other electrical device and a human for converting a mechanical infeed movement into an electrical switching signal according to the preamble of
Solche Schaltvorrichtungen haben sich in der Vergangenheit als Schnittstelle zwischen Menschen und elektrisch betriebenen Geräten bzw. Werkzeugmaschinen bewährt, da diese zuverlässig Steuersignale generieren, wenn eine mechanische Zustellbewegung auf diese erfolgt. Der konstruktive Aufbau und die Funktionsweise solcher Schaltvorrichtungen können beispielsweise aus der
Die Schnappscheibe bzw. der darüber liegende Betätigungshebel bilden demnach eine Schaltfläche. Jeder Schaltfläche kann dabei eine bestimmte Steuerfunktion zugewiesen sein, die mittels entsprechend ausgestalteter Symbolik oder Beschriftung für den jeweiligen Menschen als Benutzer erkennbar ist.The snap-action disk or the actuating lever lying above it therefore form a button. Each button can be assigned a specific control function, which is recognizable to the respective person as the user by means of appropriately designed symbols or inscriptions.
Im Inneren des Gehäuses ist eine Leiterplatte angeordnet, die zwei Schaltkontakte aufweist. Diese Schaltkontakte stehen üblicherweise aus der von der Leiterplatte gebildeten Ebene in Richtung der Schnappscheiben über. Sobald die Schnappscheibe durch eine entsprechend auf diese einwirkende mechanische Zustellkraft in Richtung der Leiterplatte durchgebogen ist, überbrückt die Unterseite der Schnappscheibe den Abstand zwischen den beiden Schaltkontakten der Leiterplatte. Somit entsteht ein elektrischer Kurzschluss, durch den ein elektrisches Schaltsignal generiert und zur Steuerung an eine Werkzeugmaschine oder ein sonstiges elektrisches Gerät weitergeleitet ist. Die Schaltkontakte sind demnach im Bereich der maximalen Auswölbung der Schnappscheibe angeordnet und verlaufen unmittelbar fluchtend unterhalb der Wölbung der Schnappscheibe. Sobald die manuelle Zustellkraft auf die Schnappscheibe nicht mehr einwirkt, springt die Schnappscheibe in ihre Ausgangsposition aufgrund der in ihr gespeicherten Vorspannkraft zurück.Inside the housing there is a printed circuit board which has two switching contacts. These switching contacts usually protrude from the plane formed by the printed circuit board in the direction of the snap disks. As soon as the snap-action disc is bent in the direction of the printed circuit board by a corresponding mechanical feed force acting on it, the underside of the snap-action disc bridges the distance between the two switching contacts of the printed circuit board. This results in an electrical short circuit, which generates an electrical switching signal and forwards it to a machine tool or other electrical device for control. The switching contacts are therefore arranged in the area of the maximum bulge of the snap-action disk and run directly aligned below the bulge of the snap-action disk. As soon as the manual feed force is no longer acting on the snap-action disc, the snap-action disc springs back into its starting position due to the preload force stored in it.
Als nachteilig bei diesem konstruktiven Aufbau hat sich herausgestellt, dass eine Schnappscheibe ausschließlich ein elektrisches Schaltsignal erzeugen kann, denn die Schnappscheibe überbrückt entweder den Abstand zwischen den beiden Schaltkontakten und erzeugt dadurch das Schaltsignal oder die Schnappscheibe ist von den beiden Schaltkontakten abgehoben bzw. beabstandet, so dass dieser elektrische Kontakt geöffnet ist.A disadvantage of this structural design has been found to be that a snap-action disc can only generate an electrical switching signal, because the snap-action disc either bridges the distance between the two switching contacts and thereby generates the switching signal, or the snap-action disc is lifted or spaced apart from the two switching contacts that this electrical contact is open.
Die
Die
Der Erfindung liegt daher die Aufgabe zugrunde, eine Schalt-Vorrichtung der eingangs genannten Gattung derart weiterzubilden, dass mittels einer Schnappscheibe mindestens zwei elektrische Steuersignale generierbar sind.The invention is therefore based on the object of further developing a switching device of the type mentioned at the outset in such a way that at least two electrical control signals can be generated by means of a snap-action disc.
Diese Aufgabe ist durch die Merkmale des kennzeichnenden Teils von Patentanspruch 1 gelöst.This object is solved by the features of the characterizing part of
Weitere vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.Further advantageous developments of the invention result from the dependent claims.
Dadurch, dass vier der vorhandenen Leiterbahnen räumlich voneinander getrennt und paarweise zusammengeschaltet sind und jedes Paar der Leiterbahnen einen Schaltkreis bilden, dass senkrecht zu den vier Leiterbahnen zwei zueinander beabstandete Stutzkörper vorgesehen sind, die in einer Ebene angeordnet sind, die zwischen den vier Leiterbahnen und der Schnappscheibe verläuft, und dass die Schnappscheibe während der Zustellbewegung von dem Stützkörper nach Art einer Wippe abgestützt ist, derart, dass der außenseitig zu dem Stützkörpern verlaufende Bereich der Schnappscheibe von der ersten und zweiten Leiterbahn abgehoben ist und gleichzeitig die Schnappscheibe auf den inneren dritten und vierten Leiterbahnen aufliegt und mit diesen elektrisch verbunden ist, ist erreicht, dass die Schnappscheibe sowohl in ihrer Ausgangsposition als auch in ihrer durchgedrückten Schnappposition jeweils verschiedene Leiterbahnen berührt und kurzschließt. Dieser jeweilige Kurzschluss kann durch eine Steuereinrichtung erkannt und in ein elektrisches Schaltsignal umgewandelt werden. Unbetätigt liegt somit eine elektrische Kontaktierung der äußeren Leiterbahnen mit den jeweils in den Eckbereichen der Schnappscheibe befindlichen Beinchen vor, wohingegen bei der Betätigung der Schnappscheibe durch Abheben der Beinchen von den äußeren Leiterbahnen diese Kontaktierung sich öffnet, während sich der Kontakt durch das Durchschwingen der Schnappscheibe auf die mittleren Leiterbahnen schließt und somit die zwei mittleren Leiterbahnen über deren Trennung im Zentrum hinweg kurzschließt.Due to the fact that four of the existing conductor tracks are spatially separated from one another and connected in pairs and each pair of conductor tracks form a circuit, that two supporting bodies are provided perpendicular to the four conductor tracks, which are spaced apart from one another and are arranged in a plane between the four conductor tracks and the snap-action disk runs, and that the snap-action disk is supported by the support body in the manner of a seesaw during the infeed movement, such that the area of the snap-action disk running on the outside to the support bodies is lifted off the first and second conductor track and at the same time the snap-action disk is lifted onto the inner third and fourth rests conductor tracks and is electrically connected to them, it is achieved that the snap-action disk touches and short-circuits different conductor tracks both in its initial position and in its pushed-through snap position. This respective short circuit can be detected by a control device and converted into an electrical switching signal. When not actuated, there is therefore electrical contact between the outer conductor tracks and the legs located in the corner areas of the snap-action disc, whereas when the snap-action disc is actuated by lifting the legs from the outer conductor tracks, this contact opens, while the contact opens due to the snap-action disc swinging through closes the middle traces and thus shorts the two middle traces across their separation in the center.
Wenn nämlich die Leiterplatte aus vier räumlich voneinander getrennten Leiterbahnen besteht, die die entsprechende Anordnung von Schaltkontakten aufweisen und wenn zwischen den Schaltkontakten der ersten, zweiten und der dritten oder vierten Leiterbahnen und zwischen dem Zentrum des Gehäuses und dem Gehäuserand rechtwinklig zu den Leiterbahnen Stützkörper angeordnet sind, auf denen die Schnappscheibe nach Art einer Wippe aufliegt, dann heben sich entweder die Randbereiche der Schnappscheibe beim Durchdrücken von den jeweiligen äußeren Leiterbahnen ab und die beiden im Zentrum vorgesehenen Schaltkontakten werden durch die Schnappscheibe kurzgeschlossen oder die Schnappscheibe schließt im unbetätigten Zustand die äußeren Leiterbahnen kurz, da diese auf den jeweiligen Leiterbahnen aufliegt, so dass jede Schnappscheibe dadurch zwei unterschiedliche Schaltsignale erzeugt.Namely, if the printed circuit board consists of four spatially separated conductor tracks which have the corresponding arrangement of switching contacts and if support bodies are arranged between the switching contacts of the first, second and the third or fourth conductor tracks and between the center of the housing and the edge of the housing at right angles to the conductor tracks , on which the snap-action disc rests like a seesaw, then either the edge areas of the snap-action disc lift off the respective outer conductor tracks when pushed through and the two switching contacts provided in the center are short-circuited by the snap-action disc or the snap-action disc short-circuits the outer conductor tracks when not actuated , since these on the respective Traces rests, so that each snap-action disc thereby generates two different switching signals.
Die derart definierte Bewegung der Schnappscheibe, insbesondere deren Eckbereiche beim Herunterdrücken der Auswölbung der Schnappscheibe in Richtung der beiden mittleren Leiterbahnen führt zu zwei unterschiedlichen Schaltsituationen, denen jeweils ein unterschiedliches Schaltsignal zugeordnet werden kann.The movement of the snap-action disk defined in this way, in particular its corner areas when the bulge of the snap-action disk is pressed down in the direction of the two central conductor tracks, leads to two different switching situations, to which a different switching signal can be assigned in each case.
Es ist besonders vorteilhaft, die Leiterplatte und deren vier Leiterbahnen als Stanzgitter aus einem elektrisch leitfähigen Werkstoff herzustellen und dieses Stanzgitter nachfolgend mittels eines elektrisch isolierenden wirkenden Werkstoffes, beispielsweise Kunststoff, zu umspritzen oder zu ummanteln. Dabei ist darauf zu achten, dass Bereiche der Leiterbahnen, die der nachfolgend eingebauten Schnappscheiben zugewandt sind, von dem isolierenden wirkenden Werkstoff nicht abgedeckt, sondern vielmehr frei zugänglich sind. Diese frei zugänglichen Bereiche der Leiterbahnen dienen nämlich als Schaltkontakte für die Schnappscheiben und zur Erzeugung der jeweiligen Kurzschlüsse. Das derart umspritzte Stanzgitter kann kostengünstig und präzise hergestellt sein, denn durch dessen Umspritzung entsteht das Gehäuse und die zur Aufnahme der Schnappscheiben erforderliche Aufnahmeöffnung, in die die jeweilige Schnappscheibe eingesetzt und lageorientiert arretiert ist.It is particularly advantageous to produce the printed circuit board and its four conductor tracks as a pressed screen from an electrically conductive material and then to encapsulate or encapsulate this pressed screen by means of an electrically insulating material, for example plastic. It is important to ensure that areas of the conductor tracks that face the subsequently installed snap disks are not covered by the insulating material, but rather are freely accessible. This is because these freely accessible areas of the conductor tracks serve as switching contacts for the snap-action disks and for generating the respective short circuits. The stamped grid overmoulded in this way can be manufactured cost-effectively and precisely, because its overmoulding creates the housing and the receiving opening required for receiving the snap-action disks, into which the respective snap-action disk is inserted and locked in a position-oriented manner.
In der Zeichnung ist ein erfindungsgemäßes Ausführungsbeispiel dargestellt, das nachfolgend näher erläutert ist. Im Einzelnen zeigt:
Figur 1- eine Schalt-Vorrichtung bestehend aus einem Gehäuse, in dem eine im Wesentlichen rechteckförmige Aussparung eingearbeitet ist, aus einer in der Aussparung angeordneten Schnappscheibe und aus vier räumlich voneinander beabstandeten Leiterbahnen, in perspektivischer Ansicht,
Figur 2- eine Draufsicht auf die Schalt-Vorrichtung der
mit zwei parallel und senkrecht zu den vier Leiterbahnen verlaufenden Stützkörpern, die an dem Gehäuse angeformt sind und die zwischen den Leiterbahnen und der Schnappscheibe verlaufen,Figur 1 - Figur 3a
- die Schalt-Vorrichtung gemäß
im Schnitt parallel und im Bereich der mittleren Leiterbahnen im unbetätigten Zustand und,Figur 1 - Figur 3b
- die Schalt-Vorrichtung gemäß
Figur 3a im betätigten Zustand und Figur 4- ein Herstellungsverfahren für die als Stanzgitter ausgestalteten Leiterbahnen und deren Gehäuse für eine Vorrichtung gemäß den vorgenannten Figuren.
- figure 1
- a switching device consisting of a housing in which an essentially rectangular recess is incorporated, a snap-action disc arranged in the recess and four conductor tracks spatially spaced apart from one another, in a perspective view,
- figure 2
- a plan view of the switching device
figure 1 with two support bodies running parallel and perpendicular to the four conductor tracks are formed on the housing and run between the conductor tracks and the snap disk, - Figure 3a
- the switching device according to
figure 1 parallel in section and in the area of the central conductor tracks in the non-actuated state and, - Figure 3b
- the switching device according to
Figure 3a in the actuated state and - figure 4
- a manufacturing method for the conductor tracks designed as a stamped grid and their housing for a device according to the aforementioned figures.
In den
Zwischen dem Betätigungselement 5 und der geschlossenen unteren Seite des Gehäuses 3 ist eine Schnappscheibe 9 angeordnet, die aus einem elektrisch leitfähigen Werkstoff hergestellt ist. Die Schnappscheibe 9 weist eine domförmige Auswölbung auf, die in Richtung des Betätigungselementes 5 ausgestaltet ist und mit diesem wie nachfolgend näher erläutert zusammenwirkt. Die Schnappscheibe 9 weist im Außenbereich domartig ausgestaltete Beinchen auf. Die Auswölbung der Schnappscheibe 9 überragt den Außenbereich bzw. die Beinchen.A snap-
Insbesondere aus
Die Leiterbahnen 21, 22, 23 und 24 liegen in einer gemeinsamen Ebene.The conductor tracks 21, 22, 23 and 24 lie in a common plane.
Zwischen den beiden äußeren Leiterbahnen 21 und 22 sind die beiden innenliegenden und räumlich voneinander getrennten dritten und vierten Leiterbahnen 23 und 24 vorgesehen, die im Bereich des Zentrums 6 der Aussparung 4 voneinander beabstandet sind. In dem Bereich des Zentrums 6 weisen die beiden Leiterbahnen 23 und 24 jeweils einen Schaltkontakt 13 auf, die jeweils mit der Schnappscheibe 9 zusammenwirken, wenn die Auswölbung der Schnappscheibe 9 in Richtung des Zentrums 6 bewegt bzw. gedreht ist. Der Abstand zwischen den beiden Schaltkontakten 13 wird folglich durch die Schnappscheibe 9 überbrückt und es entsteht ein Kurzschluss. Dieser Schaltzustand ist als zweiter Schaltkreis definiert.Provided between the two outer conductor tracks 21 and 22 are the two inner third and fourth conductor tracks 23 and 24 which are spatially separate from one another and are spaced apart from one another in the region of the
Senkrecht zu den Leiterbahnen 21, 22, 23 und 24 sind Stützkörper 25 bzw. 26 angeordnet. Die Stützkörper 25 und 26 sind dabei jeweils als Steg ausgebildet, der an der Innenwand der Aussparung 4 angeformt oder befestigt ist. Die Stützkörper 25 und 26 verlaufen senkrecht zu den vier Leiterbahnen 21, 22, 23 und 24. Zudem sind die Stützkörper 25 und 26 zwischen der Schnappscheibe 9 und den Leiterbahnen 21, 22, 23 und 24 angeordnet.Supporting
Aus den
Sobald auf die Schnappscheiben 9 oder das von außen zugängliche Betätigungselement 5 eine mechanische Zustellkraft, beispielsweise durch einen menschlichen Finger, einwirkt, ist die Schnappscheibe 9 in Richtung der beiden inneren dritten und vierten Leiterbahnen 23 und 24 durchgebogen. Die Schnappscheibe 9, insbesondere deren maximale Auswölbung, schnappt demnach zwischen den beiden parallel zueinander verlaufenden und zueinander beabstandeten Stützkörpern 25 und 26 in Richtung der Leiterbahnen 23 und 24 durch, taucht also zwischen den Stützkörper 25 und 26 hindurch, und zwar solange, bis die Unterseite der Schnappscheibe 9 auf den beiden Schaltkontakten 13 der inneren Leiterbahnen 23 und 24 aufliegt. Aufgrund der derart erzeugten Durchbiegung der Schnappscheiben 9 sind die beiden Schaltkontakte 13 der inneren Leiterbahnen 23 und 24 elektrisch kurzgeschlossen und gleichzeitig ist die Schnappscheibe 9 in den Eckbereichen 15 von den beiden äußeren Leiterbahnen 21 und 22 abgehoben. Demnach hat sich der Schaltzustand gegenüber der Ausgangssituation nach
Um die elektrische Verbindung zwischen der Schnappscheibe 9 und den jeweiligen Schaltkontakten 12, 13 zu verbessern, kann an der Unterseite der Schnappscheibe 9 in deren Zentralbereich eine entsprechende Anformung in Form einer Wölbung oder Kuppel vorgesehen sein.In order to improve the electrical connection between the snap-
In
Durch das erfindungsgemäße Herstellungsverfahren gemäß
Claims (8)
- Device (1) as an interface for an electrically operated machine tool or other electrical device and a person for converting a mechanical feed movement (2) into an electrical switching signal (12), consisting of:- a housing (3) in which at least one recess (4) is incorporated,- a snap-action disc (9) which is held so as to be pretensioned in the housing (3) and arranged in the region of the recess (4) and which in the non-actuated state is curved in the direction of the opening of the recess (4) and- a printed circuit board (10) which is arranged in the housing (3) and is formed from electrically conductive conductor tracks (21, 22, 23, 24), in the actuated state, the snap-action disc (9) entering into electrical operative contact with two conductor tracks (23, 24),characterized inthat four of the existing conductor tracks (21, 22, 23, 24) are spatially separated from one another and interconnected in pairs, and each pair of the conductor tracks (21, 22, 23, 24) form a circuit,in that two support bodies (25, 26) spaced apart from one another perpendicularly to the four conductor tracks (21, 22, 23, 24) are provided, which support bodies are arranged in a plane which extend between the four conductor tracks (21, 22, 23, 24) and the snap-action disc (9),and in that the snap-action disc (9) is supported by the support body (25, 26) in the manner of a rocker during the feed movement in such a way that the region of the snap-action disc (9), which region extends on the outside of the support bodies (25, 26), is lifted off the first and second conductor tracks (21, 22) and at the same time the snap-action disc (9) rests on the inner third and fourth conductor tracks (23, 24) and is electrically connected therewith.
- Device according to claim 1,
characterized in
that the first and the second outer conductor track (21, 22) extend in parallel with one another, in that the third and the fourth inner conductor track (23, 24) are arranged in parallel with the first and the second conductor track (21, 22) and are arranged therebetween, in that the third and fourth conductor tracks (23, 24) extend so as to be in alignment with one another, are aligned in the region of the center (6) of the recess (4) and are spatially separated from one another there. - Device according to either claim 1 or claim 2,
characterized in
that the four conductor tracks (21, 22, 23, 24) are arranged in a common plane, and in that in the non-actuated state, the outer periphery of the snap-action disc (9) rests on the first and the second conductor track (21, 22) in the corner regions of the recess (4) on the outer conductor tracks 21 and 22. - Device according to any of the preceding claims,
characterized in
that the support bodies (25, 26) are designed as projections and in that the projections (25, 26) are fastened to or are incorporated on the inner wall of the receiving opening (4) of the housing (3). - Device according to any of the preceding claims,
characterized in
that the snap-action disc (9) is curved outwardly in the shape of a dome and is prestressed against the movement direction by the pressure piece (5). - Device according to any of the preceding claims,
characterized in
that the printed circuit board (10) is produced as a punch grid (20) consisting of the four conductor tracks (21, 22, 23, 24). - Device according to claim 6,
characterized in
that the punch grid (20) is overmolded or sheathed with an electrically insulating material, preferably made of plastics material, in that regions of the conductor tracks (21, 22, 23, 24) are open or freely accessible in the direction of the snap-action disc (9) and in that the freely accessible regions of the conductor tracks (21, 22, 23, 24) are used as switching surfaces (12, 13) for the snap-action disc (9). - Device according to either claim 6 or claim 7,
characterized in
that the support bodies (25, 26) are arranged between the switching surfaces (12, 13) and are equally spaced apart from the switching contacts (12) of the first and second conductor tracks (21, 22) and the switching contacts (13) of the third and fourth conductor tracks (23, 24).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES19172270T ES2951583T3 (en) | 2019-05-02 | 2019-05-02 | Switching device |
EP19172270.1A EP3734629B1 (en) | 2019-05-02 | 2019-05-02 | Switching device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19172270.1A EP3734629B1 (en) | 2019-05-02 | 2019-05-02 | Switching device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3734629A1 EP3734629A1 (en) | 2020-11-04 |
EP3734629B1 true EP3734629B1 (en) | 2023-06-07 |
Family
ID=66529754
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19172270.1A Active EP3734629B1 (en) | 2019-05-02 | 2019-05-02 | Switching device |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3734629B1 (en) |
ES (1) | ES2951583T3 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2531841C3 (en) * | 1975-07-16 | 1981-02-26 | Rudolf Schadow Gmbh, 1000 Berlin | Electrical snap switch |
FR2841037B1 (en) * | 2002-06-13 | 2004-11-26 | Itt Mfg Enterprises Inc | NORMALLY CLOSED MINIATURIZED ELECTRIC SWITCH WITH TACTILE EFFECT |
DE102005037613A1 (en) | 2005-08-05 | 2007-02-08 | Rafi Gmbh & Co. Kg | microswitch |
US8173913B2 (en) * | 2010-03-26 | 2012-05-08 | Curbell Medical Products, Inc. | Normally closed dome switch |
-
2019
- 2019-05-02 EP EP19172270.1A patent/EP3734629B1/en active Active
- 2019-05-02 ES ES19172270T patent/ES2951583T3/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3734629A1 (en) | 2020-11-04 |
ES2951583T3 (en) | 2023-10-23 |
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