EP0212454B1 - Contact mat - Google Patents

Contact mat Download PDF

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Publication number
EP0212454B1
EP0212454B1 EP86110883A EP86110883A EP0212454B1 EP 0212454 B1 EP0212454 B1 EP 0212454B1 EP 86110883 A EP86110883 A EP 86110883A EP 86110883 A EP86110883 A EP 86110883A EP 0212454 B1 EP0212454 B1 EP 0212454B1
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EP
European Patent Office
Prior art keywords
contact
plates
foil
contact mat
sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86110883A
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German (de)
French (fr)
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EP0212454A1 (en
Inventor
Manfred Weitzel
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.)
Huebner Gummi und Kunststoff GmbH
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Huebner Gummi und Kunststoff GmbH
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Filing date
Publication date
Application filed by Huebner Gummi und Kunststoff GmbH filed Critical Huebner Gummi und Kunststoff GmbH
Priority to AT86110883T priority Critical patent/ATE58258T1/en
Publication of EP0212454A1 publication Critical patent/EP0212454A1/en
Application granted granted Critical
Publication of EP0212454B1 publication Critical patent/EP0212454B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/14—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for operation by a part of the human body other than the hand, e.g. by foot
    • H01H3/141—Cushion or mat switches

Definitions

  • Contact mats are widely used switching devices. They are used, for example, in front of doors to open and close them “automatically". Such a contact mat is placed on the floor in the area of the door, the normal position of the door being its closed position. If a person enters the contact mat, an impulse is generated which causes the door to open; if the person has left the contact mat again, the impulse stops and the door returns to its closed position. In a similar manner, a contact mat can be assigned to a machine tool in order to shut it down when an operator approaches it and runs the risk of being injured on the machine tool. If the operator has left the danger zone and thus the contact mat again, the machine tool is started again.
  • the invention is based on a contact mat according to DE-A 2 101 193, in which two contact plates are made of electrically conductive plastic or rubber and an elastic intermediate layer between the contact plates is designed as a grid-shaped plate which is self-adhesive on both sides and thus with the is connected to both contact plates.
  • This unit consisting of two contact plates and an intermediate layer is completely enclosed by a protective cover made of rubber or plastic.
  • a contact mat is known from BE-A 844 836, which consists of two cover plates and a perforated intermediate plate, no further details being given as to how the three parts are brought together and held.
  • the object of the invention is therefore to create a structurally functional and simple contact mat.
  • the subject of the invention is characterized according to claim 1.
  • each contact plate is assigned a perforated film and in each case a contact plate and a film are held together by an edge profile or a border strip.
  • edge profile or a border strip.
  • two such subgroups with the perforated foils facing one another are connected to one another by an edge profile, for example by a common edge profile.
  • this solution appears to be more complex, but in fact it offers advantages in terms of manufacture by connecting two parts that can be moved against one another, namely a contact plate and a perforated film, by attaching an edge profile to the mutually aligned parts and then two assemblies prepared in this way, possibly in a corresponding manner with a further edge profile, are connected to one another.
  • An embodiment of the invention offers the advantage of creating differently sensitive areas of the contact mat, in that each film has holes of different diameters, but holes of both films with the same diameter are assigned to one another in pairs.
  • the contact mat has two identical plates 8, 9, which consist of an elastic sheet or film material made of, for example, natural or synthetic rubber, in which a large number of electrically conductive particles are embedded in a largely uniform distribution and in contact with one another (FIG. 2).
  • the two plates are therefore inherently resilient and have a uniform electrical conductivity over their entire surface.
  • An electrically conductive wire 10, 11 is connected at basically any point on the plates, and each wire leads to the positive or negative connection terminal of an electric battery 12.
  • a signal generator 13 is in turn included, the signal of which can be processed appropriately, for example a Shut down the machine tool when a person comes near them and thereby enters the contact mat and causes its load and thus the plates 8, 9 approach each other to close contacts.
  • Each plate 8, 9 is on the inside, i.e. on the side facing the other plate, provided with a perforated film 14, 15 made of electrically non-conductive material.
  • the plates together with the perforated film associated with the respective plate are surrounded all around by an edge profile 16, 17.
  • the contact mat is not loaded, the two plates 8, 9 are separated from one another by the foils 14, 15, the circuit is interrupted. If the contact mat is loaded, for example, by a person walking on it, the plate parts in the area of the holes 18 of the perforated foils pass through these holes and touch one another in these areas, so that the circuit is closed and the signal generator 13 is a processable in the manner described above Signal generated.
  • the perforated films expediently have holes of different diameters; However, it must be ensured that there are two holes in each of the two perforated films form a pair of holes, the holes of which are arranged axially and have the same diameter.
  • the distance between the plates 8, 9 in the "switch-off position" corresponds to the sum of the thicknesses of both perforated foils and the "switching path" of both plates 8, 9 each corresponds to a perforated film thickness, so that in the "switch-on position" the plates 8, 9 in the areas of the holes 18 meet in the plane in which the perforated foils 14, 15 lie against one another, this need not be done mathematically exactly and a plate can easily pass through the holes of the perforated foil assigned to it and partially into the holes of the other perforated foil, in which then enters the plate associated with this perforated film accordingly less.
  • FIG. 2 shows a cross section through one of the plates 8, 9 on a larger scale in order to show the distribution of elastic material 19 and electrically conductive particles 20 schematically.

Abstract

The object of the application is an electrically operating contact mat which triggers a switching pulse that can be transmitted externally in the event of a change in the distance between its lower supporting surface (2) and its upper covering surface (1). Essentially, it is characterised in that, between the lower supporting surface and the upper covering surface, there are arranged a number of electrical switches (4, 5) which operate in the same sense in the event of changes to the distance between the two surfaces and are connected in a circuit containing a current source (6) and a signal generator (7). The upper covering surface and the lower supporting surface are preferably two plates of elastic material into which are embedded, in a largely even distribution, a large number of particles of electrically conductive material, each of which is provided with a perforated film of electrically non-conductive, elastic material. When no load is applied, these two plates are at a predetermined distance from one another (open switch position); on the other hand, when they are loaded, they move so far towards each other that a contact occurs facilitating the current flow (closed switch position). <IMAGE>

Description

Kontaktmatten sind vielfach angewendete Schaltmittel. Sie finden beispielsweise vor Türen Anwendung, um deren "automatisches" Öffnen und Schließen zu bewirken. Auf dem Fußboden ist im Bereich der Tür eine solche Kontaktmatte aufgelegt, wobei die Normalstellung der Tür deren geschlossene Stellung ist. Betritt eine Person die Kontaktmatte, so wird ein Impuls erzeugt, der das Öffnen der Tür veranlaßt, hat die Person die Kontaktmatte wieder verlassen, so hört der Impuls auf, die Tür kehrt in ihre Schließstellung zurück. In ähnlicher Weise kann eine Kontaktmatte einem Werkzeugautomaten zugeordnet sein, um diesen stillzusetzen, wenn sich ihm eine Bedienungsperson nähert und Gefahr läuft, an dem Werkzeugautomaten verletzt zu werden. Hat die Bedienungsperson den Gefahrenbereich und damit die Kontaktmatte wieder verlassen, so wird der Werkzeugautomat wieder in Gang gesetzt.Contact mats are widely used switching devices. They are used, for example, in front of doors to open and close them "automatically". Such a contact mat is placed on the floor in the area of the door, the normal position of the door being its closed position. If a person enters the contact mat, an impulse is generated which causes the door to open; if the person has left the contact mat again, the impulse stops and the door returns to its closed position. In a similar manner, a contact mat can be assigned to a machine tool in order to shut it down when an operator approaches it and runs the risk of being injured on the machine tool. If the operator has left the danger zone and thus the contact mat again, the machine tool is started again.

Die Erfindung geht von einer Kontaktmatte gemäß der DE-A 2 101 193 aus, bei der zwei Kontaktplatten aus elektrisch leitendem Kunststoff oder Gummi bestehen und eine elastische Zwischenlage zwischen den Kontaktplatten als gitterförmige Platte ausgebildet ist, die auf beiden Seiten selbstklebend ist und so mit den beiden Kontaktplatten verbunden ist. Diese Einheit aus zwei Kontaktplatten und einer Zwischenlage ist von einer Schutzhülle aus Gummi bzw. Kunststoff vollständig eingeschlossen.The invention is based on a contact mat according to DE-A 2 101 193, in which two contact plates are made of electrically conductive plastic or rubber and an elastic intermediate layer between the contact plates is designed as a grid-shaped plate which is self-adhesive on both sides and thus with the is connected to both contact plates. This unit consisting of two contact plates and an intermediate layer is completely enclosed by a protective cover made of rubber or plastic.

Bekannt sind ferner Kontaktmatten, die aus Gummi bestehen und in die ein Druckschlauch eingelegt ist. Betritt eine Person diese Kontaktmatte, so wird der Schlauch komprimiert, es entsteht eine Druckwelle, die einen Schalter betätigt, der beispielsweise eine Maschine stillsetzt. Diese Kontaktmatten sind relativ vielteilig und arbeiten mit relativ großen Verzögerungen.Contact mats made of rubber and into which a pressure hose is inserted are also known. If a person enters this contact mat, the hose is compressed, resulting in a pressure wave that actuates a switch that, for example, stops a machine. These contact mats are relatively multi-part and work with relatively large delays.

Aus der BE-A 844 836 ist eine Kontaktmatte bekannt, die aus zwei Deckplatten und einer gelochten Zwischenplatte besteht, wobei keine näheren Angaben gemacht sind, wie die drei Teile zusammengebracht und -gehalten sind.A contact mat is known from BE-A 844 836, which consists of two cover plates and a perforated intermediate plate, no further details being given as to how the three parts are brought together and held.

Diese Lösung bietet bei der Serienfertigung gewisse Schwierigkeiten, weil während des Fertigungsprozesses jeweils drei Teile zueinander ausgerichtet werden müssen, wovon die Oberflächen des mittleren Teiles obendrein noch haftend ausgebildet sind, ein Verschieben der drei Teile gegeneinander nicht mehr möglich ist, alle drei Teile also "auf Anhieb" korrekt gegeneinander ausgerichtet sein müssen.This solution presents certain difficulties in series production, because during the manufacturing process three parts have to be aligned with each other, of which the surfaces of the middle part are still adherent, so that the three parts can no longer be shifted against each other, ie all three parts "on" Right away "must be correctly aligned with each other.

Aufgabe der Erfindung ist deshalb die Schaffung einer baulich funktionell und einfachen Kontaktmatte.The object of the invention is therefore to create a structurally functional and simple contact mat.

Der Erfindungsgegenstand ist gekennzeichnet gemäß dem Anspruch 1.The subject of the invention is characterized according to claim 1.

Von der bekannten Lösung unterscheidet sich die Erfindung im wesentlichen dadurch, daß jeder Kontaktplatte eine gelochte Folie zugeordnet ist und jeweils eine Kontaktplatte und eine Folie durch ein Randprofil bzw. eine Einfaßleiste zusammengehalten sind. Bei der fertigen Kontaktmatte sind zwei solche Untergruppen mit den Lochfolien einander zugekehrt aufeinanderliegend miteinander durch ein Randprofil verbunden, beispielsweise durch ein gemeinsames Randprofil.The invention differs from the known solution essentially in that each contact plate is assigned a perforated film and in each case a contact plate and a film are held together by an edge profile or a border strip. In the finished contact mat, two such subgroups with the perforated foils facing one another are connected to one another by an edge profile, for example by a common edge profile.

Auf den ersten Blick erscheint diese Lösung aufwendiger, tatsächlich bietet sie jedoch bei der Herstellung Vorteile, indem zwei von Haus aus gegeneinander verschiebliche Teile, nämlich eine Kontaktplatte und eine Lochfolie dadurch miteinander verbunden werden, daß auf die gegeneinander ausgerichteten Teile ein Randprofil aufgesteckt wird und dann zwei derart vorbereitete Baugruppen, gegebenenfalls in einer entsprechenden Weise mit einem weiteren Randprofil, miteinander verbunden werden.At first glance, this solution appears to be more complex, but in fact it offers advantages in terms of manufacture by connecting two parts that can be moved against one another, namely a contact plate and a perforated film, by attaching an edge profile to the mutually aligned parts and then two assemblies prepared in this way, possibly in a corresponding manner with a further edge profile, are connected to one another.

Ein Ausführungsbeispiel der Erfindung bietet den Vorteil, unterschiedlich empfindliche Bereiche der Kontaktmatte zu schaffen, indem jede Folie Löcher verschiedener Durchmesser aufweist, jedoch Löcher beider Folien mit gleichem Durchmesser paarweise einander zugeordnet sind.An embodiment of the invention offers the advantage of creating differently sensitive areas of the contact mat, in that each film has holes of different diameters, but holes of both films with the same diameter are assigned to one another in pairs.

Die Erfindung ist nachfolgend anhand der Zeichnung näher erläutert.The invention is explained below with reference to the drawing.

Die Kontaktmatte weist zwei identische Platten 8, 9 auf, die aus einem elastischen Bahn- oder Folienmaterial aus beispielsweise Natur- oder Kunstgummi bestehen, in das eine Vielzahl elektrisch leitender Partikel in weitestgehend gleichmäßiger Verteilung und einander leitend berührend eingebettet sind (Fig. 2). Die beiden Platten sind demzufolge in sich elastisch nachgiebig und haben über ihre gesamte Fläche hinweg eine gleichmäßige elektrische Leitfähigkeit. An grundsätzlich beliebigen Stellen der Platten ist ein elektrisch leitender Draht 10, 11 angeschlossen, und jeder Draht führt zur positiven bzw. negativen Anschlußklemme einer elektrischen Batterie 12. In diesen Stromkreis ist wiederum ein Signalgeber 13 eingeschlossen, dessen Signal zweckentsprechend weiterverarbeitet werden kann, beispielsweise eine Werkzeugmaschine stillsetzen, wenn eine Person in ihre Nähe kommt und dabei die Kontaktmatte betritt und deren Belastung bewirkt und so die Platten 8, 9 zum Schließen von Kontakten einander nähert.The contact mat has two identical plates 8, 9, which consist of an elastic sheet or film material made of, for example, natural or synthetic rubber, in which a large number of electrically conductive particles are embedded in a largely uniform distribution and in contact with one another (FIG. 2). The two plates are therefore inherently resilient and have a uniform electrical conductivity over their entire surface. An electrically conductive wire 10, 11 is connected at basically any point on the plates, and each wire leads to the positive or negative connection terminal of an electric battery 12. In this circuit, a signal generator 13 is in turn included, the signal of which can be processed appropriately, for example a Shut down the machine tool when a person comes near them and thereby enters the contact mat and causes its load and thus the plates 8, 9 approach each other to close contacts.

Jede Platte 8, 9 ist auf der Innenseite, d.h. auf der der jeweils anderen Platte zugekehrten Seite, mit einer Lochfolie 14, 15 aus elektrisch nicht leitendem Material versehen. Außerdem sind die Platten zusammen mit der der jeweiligen Platte zugehörigen Lochfolie ringsum von einem Randprofil 16, 17 eingefaßt.Each plate 8, 9 is on the inside, i.e. on the side facing the other plate, provided with a perforated film 14, 15 made of electrically non-conductive material. In addition, the plates together with the perforated film associated with the respective plate are surrounded all around by an edge profile 16, 17.

Ist die Kontaktmatte unbelastet, so sind die beiden Platten 8, 9 durch die Folien 14, 15 voneinander getrennt, der Stromkreis ist unterbrochen. Wird die Kontaktmatte z.B. durch eine darauf tretende Person belastet, so treten die Plattenteile im Bereich der Löcher 18 der Lochfolien durch diese Löcher hindurch und berühren sich einander in diesen Bereichen, so daß der Stromkreis geschlossen wird und der Signalgeber 13 ein in der vorbeschriebenen Weise weiterverarbeitbares Signal erzeugt. Die Lochfolien haben zweckmäßigerweise Löcher unterschiedlicher Durchmesser; es ist aber darauf zu achten, daß jeweils zwei Löcher beider Lochfolien ein Lochpaar bilden, dessen Löcher achsgleich angeordnet sind und gleichen Durchmesser haben.If the contact mat is not loaded, the two plates 8, 9 are separated from one another by the foils 14, 15, the circuit is interrupted. If the contact mat is loaded, for example, by a person walking on it, the plate parts in the area of the holes 18 of the perforated foils pass through these holes and touch one another in these areas, so that the circuit is closed and the signal generator 13 is a processable in the manner described above Signal generated. The perforated films expediently have holes of different diameters; However, it must be ensured that there are two holes in each of the two perforated films form a pair of holes, the holes of which are arranged axially and have the same diameter.

Es ist auf diese Weise eine extrem einfache preiswert herzustellende und betriebssichere Kontaktmatte mit großer Ansprechempfindlichkeit gegeben.In this way there is an extremely simple, inexpensive to manufacture and reliable contact mat with great responsiveness.

Die Platten 8, 9 einerseits und ihre Lochfolien 14, 15 andererseits sowie die Lochfolien 14, 15 liegen unmittelbar aufeinander. Der Abstand zwischen den Platten 8, 9 in der "Ausschaltstellung" entspricht der Summe der Dicken beider Lochfolien und der "Schaltweg" beider Platten 8, 9 entspricht jeweils einer Lochfoliendicke, so daß in der "Einschaltstellung" die Platten 8, 9 in den Bereichen der Löcher 18 in der Ebene aufeinandertreffen, in der die Lochfolien 14, 15 aneinanderliegen, wobei dies nicht mathematisch exakt erfolgen muß und ohne weiteres eine Platte durch die Löcher der ihr zugeordneten Lochfolie hindurch- und in die Löcher der anderen Lochfolie teilweise eintreten kann, in die dann die dieser Lochfolie zugehörige Platte entsprechend weniger weit eintritt.The plates 8, 9 on the one hand and their perforated films 14, 15 on the other hand and the perforated films 14, 15 lie directly on top of one another. The distance between the plates 8, 9 in the "switch-off position" corresponds to the sum of the thicknesses of both perforated foils and the "switching path" of both plates 8, 9 each corresponds to a perforated film thickness, so that in the "switch-on position" the plates 8, 9 in the areas of the holes 18 meet in the plane in which the perforated foils 14, 15 lie against one another, this need not be done mathematically exactly and a plate can easily pass through the holes of the perforated foil assigned to it and partially into the holes of the other perforated foil, in which then enters the plate associated with this perforated film accordingly less.

In Fig. 2 ist ein Querschnitt durch eine der Platten 8, 9 in größerem Maßstab gezeigt, um die Verteilung von elastischem Material 19 und elektrisch leitenden Partikeln 20 schematisiert darzustellen.FIG. 2 shows a cross section through one of the plates 8, 9 on a larger scale in order to show the distribution of elastic material 19 and electrically conductive particles 20 schematically.

Claims (2)

1. A contact mat comprising two superposed electrically conductive contact sheets (8, 9) consisting of an elastic electrically non-conductive material (19), and of a plurality of particles (20) of electrically conductive material provided therein in at least approximately distribution, and an intermediate layer (14, 15), the latter and the contact sheets (8, 9) being interconnected, characterised in that a perforate foil (14, 15) is associated with each contact sheet (8, 9) on the side facing the other contact sheet (9, 8) in each case, each contact sheet (8, 9) and its associated perforate foil (14, 15) being interconnected by an edge profile (16) to form a sheet/foil combination and the sheet/foil combinations formed in this way are interconnected by another edge profile (17) in such manner that the holes (18) in the perforate foils (14, 15) in the two sheet/foil pairs are in each case co-axial to one another.
2. A contact mat according to claim 1, characterised in that each perforate foil (14, 15) has holes (18) of different diameters.
EP86110883A 1985-08-07 1986-08-06 Contact mat Expired - Lifetime EP0212454B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86110883T ATE58258T1 (en) 1985-08-07 1986-08-06 CONTACT MAT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853528382 DE3528382A1 (en) 1985-08-07 1985-08-07 CONTACT MAT
DE3528382 1985-08-07

Publications (2)

Publication Number Publication Date
EP0212454A1 EP0212454A1 (en) 1987-03-04
EP0212454B1 true EP0212454B1 (en) 1990-11-07

Family

ID=6277961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86110883A Expired - Lifetime EP0212454B1 (en) 1985-08-07 1986-08-06 Contact mat

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EP (1) EP0212454B1 (en)
AT (1) ATE58258T1 (en)
DE (2) DE3528382A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1210778B (en) * 1987-06-02 1989-09-20 Leda Logarithmic Elect Devices TWO-DIMENSIONAL ELECTRIC CONDUCTOR WITH FUNCTION OF ELECTRIC SWITCH
DE29702383U1 (en) * 1997-02-12 1998-06-04 Giersiepen Gira Gmbh Electrical switch contact mat
DE10018475A1 (en) * 2000-04-14 2001-10-18 Karlheinz Beckhausen Electrical contact mat with device for quiescent current monitoring

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE232464C (en) *
DE1981909U (en) * 1968-01-08 1968-03-28 Ver Baubeschlag Gretsch Co CONTACT MAT.
DE2101193A1 (en) * 1971-01-12 1972-08-03 Ver Baubeschlag Gretsch Co Contact mat
DE2138919A1 (en) * 1971-08-04 1973-02-15 Ver Baubeschlag Gretsch Co CONTACT MAT
DE2148760C3 (en) * 1971-09-30 1981-07-16 Siemens AG, 1000 Berlin und 8000 München Pedal switch device actuating electrical contacts
BE844836A (en) * 1976-08-03 1976-12-01 ELECTRICAL SWITCH SYSTEM
US4105899A (en) * 1977-01-12 1978-08-08 Velosa Joseph M Safety mat switch for machine tools and their like
GB2128031B (en) * 1982-09-30 1986-06-25 Minnesota Mining & Mfg Pressure sensitive switchmats

Also Published As

Publication number Publication date
EP0212454A1 (en) 1987-03-04
DE3528382A1 (en) 1987-02-12
ATE58258T1 (en) 1990-11-15
DE3675461D1 (en) 1990-12-13

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