EP0215037B1 - Schaltmatte und verfahren zu ihrer herstellung - Google Patents

Schaltmatte und verfahren zu ihrer herstellung Download PDF

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Publication number
EP0215037B1
EP0215037B1 EP86901354A EP86901354A EP0215037B1 EP 0215037 B1 EP0215037 B1 EP 0215037B1 EP 86901354 A EP86901354 A EP 86901354A EP 86901354 A EP86901354 A EP 86901354A EP 0215037 B1 EP0215037 B1 EP 0215037B1
Authority
EP
European Patent Office
Prior art keywords
contact
contact surfaces
pressure difference
switching mat
coating
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
Application number
EP86901354A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0215037A1 (de
Inventor
Fritz D. Buchien
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.)
Mayser GmbH and Co KG
Original Assignee
Mayser GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mayser GmbH and Co KG filed Critical Mayser GmbH and Co KG
Priority to AT86901354T priority Critical patent/ATE45644T1/de
Publication of EP0215037A1 publication Critical patent/EP0215037A1/de
Application granted granted Critical
Publication of EP0215037B1 publication Critical patent/EP0215037B1/de
Expired 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49105—Switch making

Definitions

  • the invention relates to a switch mat with two opposing, mutually movable, in particular flexible, and electrically conductive contact surfaces, which are separated from one another by electrically isolating spacers which form between contact windows and are elastically deformable in the direction perpendicular to the contact surfaces, and at least in the area of the contact windows one of the two contact surfaces projecting toward the opposite contact surface, which are formed by bulges of the contact surfaces, the distance between the contact projections and the opposite contact surface or the opposite contact projections being no greater than the elastic spring stroke of the spacers when the switching mat is not loaded.
  • Such a switch mat is known for example from GB-A-2 134 714.
  • Such safety mats are used, for example, as a protective device for closing edges that can be moved by a drive. In the event of an object in the area of movement of the closing edge touching the switching mat, contact is made in the manner of a closing switch via which a suitable safety measure, usually the switching off of the drive, can be initiated.
  • a suitable safety measure usually the switching off of the drive
  • Such switch mats are also used as a foot contact mat arranged in the range of movement of the closing edge, so that the drive cannot be actuated as long as there is a person on the switch mat.
  • a safety mat of this type is known from the magazine "The SAE Journal of automotive Engineering", vol. 79, no. 10, Oct. 1971, p. 22 and serves there as a sensor for whether the seat of a motor vehicle is occupied or not.
  • the contact surfaces consist of thin copper sheets into which the bulges are stamped.
  • the dimensional rigidity of these sheets required for stamping means that relatively high forces are required to make contact, such as occur when the body weight of a person is applied. For the rest, the forces have to act distributed over a relatively large surface area in order to bring the contact surfaces closer together and bring them into contact because of their high dimensional stability for making contact in this surface area. If, on the other hand, the switch mat is only loaded locally, no contact occurs with only small attacking forces, whereas with large forces, however, the contact surface is permanently deformed.
  • Another safety mat is also known from DE-A-2 418 856.
  • the bulges in the area of the contact windows are formed in the opposite direction, so that the contact areas in the window area are at a greater distance from one another than in the area of the spacers.
  • the bulges spring over to the opposite contact surface and thus bring about contact.
  • relatively high forces are also required for this, since the contact surfaces must also have sufficient dimensional rigidity.
  • the switch mat is sealed in a plastic sleeve to avoid the ingress of dirt or water, which loosely surrounds the contact surface.
  • the contact surfaces are flat and run parallel to one another in the unloaded state.
  • the upper contact surface to be loaded is made of heavy sheet metal that resists any deflection, while the lower contact surface is made of relatively light sheet metal material.
  • the lower contact surface is provided on its underside with foot-like projections which are arranged in the region of the contact window. When the switch mat is loaded, the foot-like projections push the lower contact surface in the area of the contact window upward and thus lead to contact.
  • considerable forces are required to trigger the switching function, especially since the lower contact surface must be deformed over the entire area because of the upper, rigid contact surface.
  • the covering has a greater thickness in the area of the contact window and likewise forms projections there, via which the contact surfaces are brought into mutual contact when the switch mat is loaded.
  • the two contact surfaces have a high degree of flexural rigidity, so that contact is only made at relatively high pressure forces acting on the switch mat.
  • the invention has for its object to design a safety mat of the type mentioned in such a way that reliable contact is ensured even at a relatively low pressure load and the risk of permanent deformation is largely excluded, and that it is sufficiently robust, in particular also walkable, with regard to heavy loads, and to specify a method for producing such safety mats.
  • This task is related to the safety mat solved according to the invention in that the contact surface provided with contact projections is formed by a shape-resistant film which carries on its side facing away from the other contact surface an elastic coating which fixes the bulges.
  • the advantage achieved by the invention consists essentially in the fact that at least one of the contact surfaces has a low bending stiffness, so that contact is already made with only selective contact with low force.
  • the intended contact projections which likewise reduce the forces necessary to deform the spacers until contact is made and cannot be introduced into the film in a dimensionally stable manner, are permanently fixed by the elastic coating. Due to the elasticity of the coating, there is even elastic contact in the area of the contact projections.
  • the coating completely surrounds the contact surfaces in an outwardly sealing manner. This means that it is no longer necessary to embed the safety mat in a separate cover.
  • the invention is characterized in that first the two contact surfaces separated from one another by the spacers forming the contact windows are sealed off from one another at the edges, and then a pressure difference is built up between the inside and outside of the switch mat such that the internal pressure is lower than the external pressure is that the bulges of the contact surface, which are directed toward the inside by the pressure difference in the area of the contact windows, are then fixed by an externally applied, in particular elastically curable, coating of sufficient dimensional rigidity which maintains the bulges even without a pressure difference, and finally, after the coating has cured, the pressure difference is broken down.
  • the particular advantage of this manufacturing process is that no deforming tools are required to form the contact projections, so that switch mats of various sizes and with any arrangement of the contact projections can be easily produced. It is immediately ensured that the contact projections are each arranged exactly in the area of the contact window specified by the spacers. Due to the constant pressure difference in the entire surface area of the switch mat, a very even formation of the contact projections is ensured. In particular, the pressure difference is expediently chosen so that the two contact surfaces touch one another. This ensures in a particularly simple manner that the contact distance when the switch mat is not loaded and thus the actuating force required to trigger the switching function is substantially the same over the entire surface of the switch mat.
  • the spacers Due to the lower internal pressure compared to the outside, the spacers are deformed in their actuation direction by a force that is essentially constant over the surface, this deformation path representing the actuation stroke required to make contact due to the mutual contact of the two contact surfaces after the pressure difference has been reduced.
  • one of the two contact surfaces can be provided with an elastic, but still having a stiffness in terms of shape or stiffness before the build-up of the pressure difference in order to prevent the bulges from occurring on this contact surface.
  • the pressure difference can be built up in a particularly simple manner by evacuating the interior of the switch mat by means of a cannula.
  • the edge-side sealing of the two contact surfaces required to build up the pressure difference can in principle be carried out using any conventional sealant. This can be carried out in a particularly simple manner in that the edge-side sealing is carried out by means of a first coating of small thickness which at least surrounds the switching mat at the edge. It is readily possible to coat the switch mat even over the entire surface if the layer thickness is sufficiently thin so that the bulges can still form due to the pressure difference to be built up.
  • the switching mat shown in the drawing consists of two opposing flexible and electrically conductive contact surfaces 1, 2.
  • the contact surfaces 1, 2 are separated from one another by elastically deformable spacers 3, the spacers 3 forming contact windows 4 between them.
  • contact projections 5 are provided on each of the two contact surfaces 1, which protrude toward the opposite contact surface 2.
  • the contact projections 5 are dimensioned such that the distance between the contact projections 5 and the opposite contact surface 2 is no greater than the elastic spring stroke of the spacers 3 when the switching mat is not loaded.
  • the contact surfaces 1, 2 are provided with corresponding contact projections 5.
  • the contact surface 1 is formed by a film which is provided with bulges forming the contact projections 5.
  • the film On its side facing away from the other contact surface 2, the film carries an elastic coating 6 which fixes the bulges and which, moreover, completely seals the entire switch mat to the outside.
  • the coating 6 can advantageously consist of a natural or synthetic casting compound which is present in a viscous form when it is cast by heating or by adding solvents or plasticizers or arises through chemical reaction of starting components.
  • the coating can also be in the form of foam, but can also be produced by sintering powdery starting materials, provided that the seal is guaranteed.
  • a PUR coating that is produced from two or more components has proven to be particularly suitable.
  • the spacers 3 are formed by a foam mat which has the cutouts forming the contact window 4.
  • the contact windows 4 can have a circular or square shape, for example, and can be punched out of the foam mat, the mutual arrangement of which can be selected such that the spacers 3 form only narrow webs.
  • the spacers 3 can also be formed by foam strips arranged in a grid-like manner with mutual spacing, the spaces between which form the contact windows 4.
  • the two contact surfaces 1, 2 separated from one another by the spacers 3 are first sealed off from one another at the edges. Then a pressure difference is built up between the inside and the outside of the switch mat, the internal pressure being lower than the external pressure. This pressure difference forms bulges in the area of the contact window 4 towards the inside of the switch mat, which are fixed by an elastically hardening coating 6 applied on the outside of sufficient dimensional rigidity which maintains the bulges even without a pressure difference. After they have hardened, the pressure difference is finally reduced again.
  • the pressure difference will be chosen so that the two contact surfaces 1, 2 touch each other, since then after the pressure difference has been reduced, the distance of the contact projection 5 from the opposite contact surface 2 or the opposite contact projection is equal to the spring travel of the spacer 3, by which it has been elastically deformed under the influence of the pressure difference.
  • One of the two contact surfaces 1, 2 can be provided with an elastic yet stiff coating or a stiff coating before the pressure difference is built up, so that no bulges occur on this contact surface, as is shown in FIGS. 1 and 2 for the contact surface 2 is shown.
  • the pressure difference is built up by evacuating the interior of the switch mat using a cannula, a pressure difference of approximately 0.5 atmospheres generally being sufficient.
  • the edge seal for the evacuation can be carried out in a particularly simple manner in that the switch mat is provided with a coating of such a small thickness that the bulges can easily form during the subsequent build-up of the pressure difference.

Landscapes

  • Push-Button Switches (AREA)
EP86901354A 1985-03-06 1986-03-03 Schaltmatte und verfahren zu ihrer herstellung Expired EP0215037B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86901354T ATE45644T1 (de) 1985-03-06 1986-03-03 Schaltmatte und verfahren zu ihrer herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3507922 1985-03-06
DE19853507922 DE3507922A1 (de) 1985-03-06 1985-03-06 Schaltmatte und verfahren zu ihrer herstellung

Publications (2)

Publication Number Publication Date
EP0215037A1 EP0215037A1 (de) 1987-03-25
EP0215037B1 true EP0215037B1 (de) 1989-08-16

Family

ID=6264368

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86901354A Expired EP0215037B1 (de) 1985-03-06 1986-03-03 Schaltmatte und verfahren zu ihrer herstellung

Country Status (4)

Country Link
US (1) US4773155A (enrdf_load_stackoverflow)
EP (1) EP0215037B1 (enrdf_load_stackoverflow)
DE (1) DE3507922A1 (enrdf_load_stackoverflow)
WO (1) WO1986005317A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8493081B2 (en) 2009-12-08 2013-07-23 Magna Closures Inc. Wide activation angle pinch sensor section and sensor hook-on attachment principle
US9234979B2 (en) 2009-12-08 2016-01-12 Magna Closures Inc. Wide activation angle pinch sensor section

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4661664A (en) * 1985-12-23 1987-04-28 Miller Norman K High sensitivity mat switch
US5027552A (en) * 1990-08-16 1991-07-02 Miller Edge, Inc. Redundant sensing edge for a door for detecting an object in proximity to the door edge
US5066835A (en) * 1990-09-19 1991-11-19 Miller Edge, Inc. Sensing edge
GB9027066D0 (en) * 1990-12-13 1991-02-06 Samco Strong Ltd Cutting press
US5793125A (en) * 1991-02-25 1998-08-11 Tarng; Min Ming Smart integrated socket automation system
DE4117374A1 (de) * 1991-05-28 1992-12-03 Ingolf Zimmer Vorrichtung fuer das tennis-aufschlagtraining mit ballplazierung
GB2261115A (en) * 1991-10-29 1993-05-05 Eja Eng Plc Pressure sensitive mat
US5299387A (en) * 1992-02-14 1994-04-05 Miller Edge, Inc. Sensing edge for a gate
DE4323542C2 (de) * 1993-07-14 1996-12-19 Hans Juergen Hennig Elektrischer Schalter
US5554835A (en) * 1994-07-27 1996-09-10 Bed-Check Corporation Traversing conductor pressure sensitive switch
JPH08161959A (ja) * 1994-12-01 1996-06-21 Fujitsu Ltd スイッチ及びその製造方法
DE19604128C1 (de) * 1996-02-06 1997-08-07 Mayser Gmbh & Co Schaltanordnung
DE19606745C2 (de) * 1996-02-23 1998-12-03 Wampfler Ag Schließkantensicherung
ES2165587T3 (es) 1996-10-03 2002-03-16 Iee Sarl Procedimiento y dispositivo para determinar varios parametros de una persona sentada en un asiento.
LU90046B1 (de) * 1997-04-04 1998-10-05 Iee Sarl Vorrichtung zur Einklemmerkennung bei einem kraftbetaetigten Schliesselement
US5965951A (en) * 1998-03-10 1999-10-12 Lear Automotive Dearborn, Inc. Modular wire harness and carpet for vehicle
DE19906037A1 (de) * 1999-02-12 2000-08-31 Trw Automotive Electron & Comp Schalter, insbesondere Kfz-Bremslichtschalter
US6450886B1 (en) * 1999-04-09 2002-09-17 Konami Co., Ltd. Foot switcher, foot switch sheet and mat for use in the same
GB2350932A (en) * 1999-06-08 2000-12-13 Lui Mei Chu Film-type switch
DE10221315A1 (de) * 2002-05-07 2003-11-20 Mayser Gmbh & Co Elektrische Schaltanordnung und Verfahren sowie Vorrichtung zu ihrer Herstellung
EP1861838A4 (en) * 2005-02-16 2013-05-15 Miller Edge Inc BIDIRECTIONAL DETECTION EDGE FOR BARRIER
US9775768B2 (en) 2009-01-26 2017-10-03 Ii Keith Duane Cheatham Interactive therapeutic mat
DE102010011842A1 (de) 2010-03-11 2011-09-15 Mayser Gmbh & Co. Kg Verfahren zum Herstellen einer Schaltmatte und Schaltmatte
DE102010012851A1 (de) * 2010-03-25 2011-09-29 Ssp Europe Gmbh Erfassungseinrichtung zur Erfassung eines Zugriffs durch Unbefugte auf eine Informationstechnikanlage, flüchtige Speichereinrichtung, Schutzvorrichtung, Schutzverfahren sowie Schutzsystem
DE102012105039B4 (de) * 2012-06-12 2020-11-12 BBC BircherAG Verfahren zur Herstellung einer Schaltmatte und eine Schaltmatte
CN110223862B (zh) * 2019-07-02 2020-01-17 山东穆柯传感器有限公司 一种安全地毯及其生产工艺
AT522685B1 (de) * 2019-11-19 2021-01-15 Zwisler Georg Schaltvorrichtung

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DE72862C (de) * J. WEBER in Plötzensee bei Berlin Eine Vorrichtung, um Linien vermittelst Schatten hervorzubringen
DE1169001B (de) * 1958-10-02 1964-04-30 Stanley Works Als elektrischer Schalter ausgebildete Fussmatte
US3654407A (en) * 1970-06-08 1972-04-04 Sylvania Electric Prod Compression switch
US3722086A (en) * 1970-08-21 1973-03-27 Lanson Ind Inc Process for making floor mat switches
US3718791A (en) * 1971-09-16 1973-02-27 Gen Motors Corp Pressure responsive switch
DE7142981U (de) * 1971-11-15 1972-05-18 Hirschler W Elektrische Sicherheits-Schaltmatte
GB1411281A (en) * 1972-02-26 1975-10-22 Clifford Covering Co Ltd Electrical swit- hes
US3812313A (en) * 1973-02-20 1974-05-21 Switches Inc Tread type switch for use in passenger seats or the like
US3821500A (en) * 1973-02-26 1974-06-28 Marc Mfg Inc Floor mat with electrical switch
US3830991A (en) * 1973-07-24 1974-08-20 Essex International Inc Pressure sensitive mat switch construction
DE2418856A1 (de) * 1974-04-19 1975-11-20 Crawley Druckbeeinflusster schalter
US4172216A (en) * 1978-05-19 1979-10-23 Sprague Electric Company Pressure sensitive switch
JPS5866216A (ja) * 1981-10-16 1983-04-20 信越ポリマ−株式会社 キ−ボ−ド装置
DE3248607A1 (de) * 1982-12-30 1984-07-12 Petri Ag, 8750 Aschaffenburg Signalgeber fuer kraftfahrzeuge

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8493081B2 (en) 2009-12-08 2013-07-23 Magna Closures Inc. Wide activation angle pinch sensor section and sensor hook-on attachment principle
US9234979B2 (en) 2009-12-08 2016-01-12 Magna Closures Inc. Wide activation angle pinch sensor section
US9417099B2 (en) 2009-12-08 2016-08-16 Magna Closures Inc. Wide activation angle pinch sensor section

Also Published As

Publication number Publication date
US4773155A (en) 1988-09-27
DE3507922A1 (de) 1986-09-11
EP0215037A1 (de) 1987-03-25
DE3507922C2 (enrdf_load_stackoverflow) 1987-10-08
WO1986005317A1 (fr) 1986-09-12

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