EP0464231A1 - Panneau à contact de sécurité - Google Patents

Panneau à contact de sécurité Download PDF

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Publication number
EP0464231A1
EP0464231A1 EP90112534A EP90112534A EP0464231A1 EP 0464231 A1 EP0464231 A1 EP 0464231A1 EP 90112534 A EP90112534 A EP 90112534A EP 90112534 A EP90112534 A EP 90112534A EP 0464231 A1 EP0464231 A1 EP 0464231A1
Authority
EP
European Patent Office
Prior art keywords
hose
circuit board
cover plate
safety circuit
board according
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.)
Withdrawn
Application number
EP90112534A
Other languages
German (de)
English (en)
Inventor
Thomas Ing Peisler
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.)
PEISLER GmbH
Original Assignee
PEISLER GmbH
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 PEISLER GmbH filed Critical PEISLER GmbH
Publication of EP0464231A1 publication Critical patent/EP0464231A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • H01H2003/147—Special aspects regarding the peripheral edges of the mat switches
    • 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
    • H01H2003/148—Cushion or mat switches the mat switch being composed by independently juxtaposed contact tiles, e.g. for obtaining a variable protected area
    • 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
    • H01H3/142—Cushion or mat switches of the elongated strip type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/0271—Bases, casings, or covers structurally combining a switch and an electronic component

Definitions

  • the invention relates to a safety circuit board for triggering an alarm and / or control function when driving or entering with a housing, with an edge profile provided on its edge, with a cover plate held freely movable from the edge profile above the floor and with a between the floor and cover plate arranged, responsive to pressure of the cover plate and connected with its two ends to a signal evaluation device.
  • Safety circuit boards of this type are known. For example, they are embedded in the floor next to presses, rollers, robots and other dangerous machines in workshops. As soon as a worker steps on the plate or approaches a vehicle when approaching the machine, the circuit board responds and gives an electrical signal. This can be used to switch off the machine and / or to trigger an optical or acoustic alarm.
  • a known circuit board (DE-OS 3 715 871)
  • conductive and non-conductive layers are arranged alternately one above the other between the base and cover plates. These layers form a signal generator. Each conductive layer is electrically connected at one end to the next-but-one conductive layer. The other ends of the conductive layers are connected to a voltage supply and to a signal evaluation device.
  • the non-conductive layers can be compressed elastically. When the cover plate and thus the layers are pressed, the conductive layers become compressed due to the non-conductive layers Connected through layers.
  • the signal evaluation device recognizes this change in state. It supplies a signal indicating this change in state.
  • the known circuit board is widely used. It has proven itself in practice. However, malfunctions are conceivable in which it does not fulfill its task. This allows oil to penetrate the circuit board and isolate the conductive layers from each other. When the cover plate is pressed, the conductive layers then remain insulated from one another despite the compression of the non-conductive layers. This affects the functionality of the known circuit board.
  • the invention has for its object to design a circuit board so that it maintains its functionality even in the event of oil penetration and other conceivable malfunctions.
  • the very strict safety requirements of the professional associations should also be met. Among other things, these require so-called diversified redundancy. This means that the functionality must be monitored in various ways.
  • the solution to the problem arises according to the invention in that the signal transmitter consists of a tube laid between the bottom and the cover plate with substantially uniform mutual spacing with a conductive layer on its bottom and a conductive layer under its top, which is in the idle state of the Hose are isolated from each other, and the two conductive layers are connected to the signal evaluation device.
  • the signal transmitter thus essentially consists of an elastic and self-contained hose. Oil, grease and water cannot penetrate the hose without damaging it.
  • the cover plate protects the hose sufficiently against possible damage. This results in great security for the entire circuit board and its function.
  • Hoses with a conductive layer on the bottom and another conductive layer under the top are known. The diameter, their wall thickness, the elasticity of their material and the shape are chosen and coordinated so that the two conductive layers are sufficiently far apart in the relaxed state of rest. When the cover plate is pressed, the hose is compressed at least at one point so far that the two conductive layers touch. This closes a circuit in which the voltage supply and the signal evaluation device are located. The signal evaluation device triggers an alarm, switches off a machine and the like.
  • the circuit via which the voltage supply, the hose and the signal evaluation device are connected to one another is known. Such a circuit is described for example in DE-OS 3 715 871.
  • the hose runs spirally inwards from a point on the edge of the housing, reverses its direction of rotation there, runs outward again parallel to the inward-extending windings to the edge and there again next to the point mentioned above ends.
  • the ends of the conductive layers can thus also be easily connected to the voltage supply and the signal evaluation device.
  • the switching of the voltage supply, the connection of the conductive layers of the hose to the voltage supply and the signal evaluation device belong to the state of the art. To simplify, part of the following description not referred to the voltage supply and assumed that it is part of the signal evaluation device.
  • the two conductive layers of the two ends of the hose lying next to one another at the edge of the housing are expediently all connected to this signal evaluation device. So the hose has four connections. Two of these are connected to the actual voltage supply and two more are connected to the actual signal evaluation device.
  • the hose expediently runs parallel to the edges of the housing. In its corners it changes its direction by 90 °. With this form of installation, the hose also lies in the corners of the housing. There are no areas in which the circuit board is insensitive and does not react to pressure.
  • the hose is expediently fastened to a base plate of the housing. It can also be attached under the cover plate. For example, it is glued to one of these plates.
  • the cover plate suitably consists of several individual, interconnected sections. H-shaped connectors are used to connect them. The division of the cover plate into several sections facilitates the assembly of the housing. It also increases the sensitivity of the circuit board. A pressure exerted selectively on a single section of the cover plate is transmitted to the hose section located underneath and is not intercepted by the cover plate over its entire surface.
  • the connecting pieces are expediently designed such that they have a web and flanges extending from its two ends and these can be pushed onto the individual sections of the cover plate with a close fit.
  • the employers' liability insurance associations monitor the operational readiness of the Demand circuit boards.
  • the hose is at a pressure above atmospheric pressure, is connected to a pressure gauge, and this triggers an alarm if the pressure drops. If the hose is damaged despite its secure position in the housing or if it becomes porous, its internal pressure drops. This is noticed immediately.
  • the edge profile is fastened to the base plate, the edge profile has a stop on its inside at the level of the cover plate and a protrusion over this cover plate. There should be a game between the inner edge of the stop and the cover plate.
  • the two ends of the hose lie side by side on the edge of the housing. From an electrical point of view, the electrical input and the electrical output of the hose are also next to each other. For this purpose, the hose is returned to the entrance after it has passed through the housing.
  • the invention provides yet another embodiment in which the hose does not have to be returned to the entrance.
  • This embodiment is characterized in that the signal evaluation device consists of a voltage source connected to the electrical input of the hose and an electrical one connected to the electrical output of the hose Closing element exists and this emits a signal when the voltage acting on it deviates from a desired value and this is detected by the voltage source.
  • the voltage source is expediently a DC voltage source and contains a filter for detecting the signal emitted by the electrical terminating element.
  • the hose is inserted into the housing at any point on the edge thereof. It ends at a location that is independent of this point of entry. There the electrical terminating element is connected to it. At the same time, the hose is closed pressure-tight. In this embodiment, the hose is completely detached from the electrical requirements resulting from the voltage supply and signal evaluation device, in the housing. It is only guided under the housing in such a way that it runs as evenly as possible.
  • the safety circuit board 12 includes a bottom plate 14 and a top plate 16. Generally, these two plates are divided into several sections. According to the illustration in FIG. 4, there is a non-slip support 18 on the cover plate 16. According to the illustration in FIG. 4, the base plate 14 projects beyond the cover plate 16. The edge profile 20 is located on this protruding edge. It is firmly connected to the base plate 14, for example glued to it. This edge profile 20 runs along the four edges or edges of the entire safety circuit board 12. The hose 22 lies in numerous turns between the base plate 14 and the cover plate 16. The edge profile 20 has a plurality of feet 24. With these it stands on the base plate 14. The edge profile 20 also has a vertical web 26.
  • the tube 22 is not circular when relaxed, but has a compressed shape. He points a flat bottom 32, a curved upper side 34 and side walls 36 connecting them.
  • the lower conductive layer 38 runs on the bottom 32.
  • the upper conductive layer 40 runs below the curved upper side 34.
  • the two conductive layers 38 and 40 are at a distance from one another and are at a distance from one another thus electrically isolated from each other.
  • the base plate 14 and the cover plate 16 are composed of several sections.
  • 1 shows two sections for the base plate 14 and two sections for the cover plate 16.
  • the sections forming the base plate 14 are firmly connected to one another, for example welded.
  • the sections forming the cover plate 16, on the other hand, are movably connected to one another.
  • the connection is made via a connecting piece 42.
  • This has a web 44 and flanges 46 extending from it.
  • the flanges 46 overlap the edges of the sections of the cover plate 16. They are pushed onto them with a close fit.
  • Fig. 5 shows an embodiment without a base plate of the housing.
  • the hose 22 is fastened under the cover plate 16, for example glued to it, and lies directly on the floor 48 of the room, for example a production hall.
  • FIG. 6 shows the safety circuit board 12 from above, partially cut away.
  • the base plate 14, the circumferential edge profile 20 and the individual knobs of the non-slip support 18 can be seen.
  • the course of the hose 22 can also be seen.
  • the two hose ends, which are to be called the beginning and end of the hose, are at the bottom right in the illustration in FIG. 6 .
  • the beginning of the hose is shown in solid lines. This beginning of the hose is placed in a counterclockwise direction on the base plate 14. It runs parallel to the edges and is bent by 90 ° in the ceiling. In this way, it runs up to about the middle of the base plate 14. There it reverses its direction. It runs clockwise to the outside.
  • These outward turns, the so-called hose end are shown in dashed lines.
  • the hose end is right next to the start of the hose.
  • the beginning and end of the hose each have a lower conductive layer 38 and an upper conductive layer 40. This results in four connections. These are connected to
  • the dimensions of the various parts, the elasticity of the hose 22 and the weight of the cover plate 16 are coordinated with one another in such a way that the hose 22 bears the weight of the cover plate 16 in the idle state and this shows that shown in FIGS. 1, 4 and 5 Takes position.
  • the conductive layers 38 and 40 are separated and insulated.
  • the cover plate 16 is almost freely movable. As shown in FIG. 4 or FIG. 5, it can move from top to bottom when pressure is applied. There is sufficient play between its edge and the stops 28. The same applies to the edge of the non-slip pad 18 and the protrusion 30.
  • the cover plate 16 compresses the hose 22 over a smaller or greater part of its length.
  • the image shown in FIG. 3 is created.
  • the two conductive layers 38 and 40 touch and make electrical contact.
  • An electrical circuit is closed. This has the consequence, for example, that the two ends of the two conductive layers 38 and 40 connected to the signal evaluation device become dead. This is recognized by the signal evaluation device. This triggers an alarm. If necessary, a machine is also switched off. Depending on the resistance of the two conductive layers 38 and 40, a short circuit occurs at the voltage supply. This is also recognized and can be used to trigger an alarm.
  • Signal evaluation devices operating with direct voltage and with alternating voltage can be used in the embodiments according to FIGS. 1 to 6. It was stated that the hose 22 is pressurized. If the hose or a supply line is damaged, this overpressure drops. This is also recognized.
  • the signal evaluation device contains an electrical terminating element 50 connected to the end of the hose 22.
  • the beginning of the hose is inserted into the housing 14 at the edge thereof.
  • the voltage source which is not shown, is connected to the hose 22.
  • the hose 22 can be guided in a variety of forms in the housing when using the electrical termination element 50. It is only necessary to ensure that it is distributed as uniformly as possible over the housing surface.
  • the voltage source applies direct voltage to the hose 22.
  • the electrical termination element 50 contains a chip, a microprocessor or the like. When DC voltage is applied, it sends out a signal. This is detected at the voltage source, for example using a filter.
  • the electrical termination element 50 When the hose 22 is compressed, a short circuit occurs.
  • the electrical termination element 50 is de-energized. The signal just mentioned is no longer transmitted. This is determined at the output of the filter. An alarm is triggered.
  • the signal emitted by the electrical terminating element 50 also changes if, when the hose is damaged, a DC voltage deviating from the nominal voltage is applied to it. This is also detected. An alarm is triggered.

Landscapes

  • Push-Button Switches (AREA)
  • Measuring Fluid Pressure (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
EP90112534A 1990-06-30 1990-06-30 Panneau à contact de sécurité Withdrawn EP0464231A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9007245U DE9007245U1 (de) 1990-06-30 1990-06-30 Sicherheits-Schaltplatte
DE4020974A DE4020974A1 (de) 1990-06-30 1990-06-30 Sicherheits-schaltplatte

Publications (1)

Publication Number Publication Date
EP0464231A1 true EP0464231A1 (fr) 1992-01-08

Family

ID=25894638

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90112534A Withdrawn EP0464231A1 (fr) 1990-06-30 1990-06-30 Panneau à contact de sécurité

Country Status (2)

Country Link
EP (1) EP0464231A1 (fr)
DE (2) DE4020974A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29716609U1 (de) * 1997-09-16 1997-11-20 FRABA Sicherheitssysteme GmbH, 51063 Köln Schaltmatte
DE10331284B4 (de) * 2003-07-10 2005-06-16 Gummi-Welz Gmbh & Co. Kg Fußschutzleiste

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE540187C (de) * 1929-11-27 1931-12-11 Leopold Rado Bei Belastung ansprechende Kontaktvorrichtung fuer elektrische Signalanlagen
DE2538050A1 (de) * 1975-08-27 1977-03-10 Kabel Metallwerke Ghh Elektrische kontaktmatte zur ausloesung einer warnanlage
US4075616A (en) * 1975-11-12 1978-02-21 Rait Joseph M Detector for alarm system
WO1980000044A1 (fr) * 1978-06-06 1980-01-10 Multisafe Ag Conduites a l'abri d'actes de sabotage, pour installations de securite et leur installation dans un grillage de protection
DE3715871A1 (de) * 1987-05-08 1988-11-17 Thomas Peisler Schaltungsanordnung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1971111U (de) * 1967-04-26 1967-10-26 Kurt Huebner Kontaktmatte fuer tritte u. dgl.
GB2172748A (en) * 1985-02-07 1986-09-24 Cyril John Peachey Pressure mat switch assemblies
DE8909161U1 (de) * 1989-07-28 1989-10-26 Zimmermann, Uwe, 74821 Mosbach Trittplatte

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE540187C (de) * 1929-11-27 1931-12-11 Leopold Rado Bei Belastung ansprechende Kontaktvorrichtung fuer elektrische Signalanlagen
DE2538050A1 (de) * 1975-08-27 1977-03-10 Kabel Metallwerke Ghh Elektrische kontaktmatte zur ausloesung einer warnanlage
US4075616A (en) * 1975-11-12 1978-02-21 Rait Joseph M Detector for alarm system
WO1980000044A1 (fr) * 1978-06-06 1980-01-10 Multisafe Ag Conduites a l'abri d'actes de sabotage, pour installations de securite et leur installation dans un grillage de protection
DE3715871A1 (de) * 1987-05-08 1988-11-17 Thomas Peisler Schaltungsanordnung

Also Published As

Publication number Publication date
DE4020974A1 (de) 1992-01-09
DE9007245U1 (de) 1990-10-04
DE4020974C2 (fr) 1992-05-27

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