EP0141099B1 - Meldegerät - Google Patents

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Publication number
EP0141099B1
EP0141099B1 EP84109896A EP84109896A EP0141099B1 EP 0141099 B1 EP0141099 B1 EP 0141099B1 EP 84109896 A EP84109896 A EP 84109896A EP 84109896 A EP84109896 A EP 84109896A EP 0141099 B1 EP0141099 B1 EP 0141099B1
Authority
EP
European Patent Office
Prior art keywords
casing
warning device
tubular holder
explosion
appliance head
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
EP84109896A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0141099A2 (de
EP0141099A3 (en
Inventor
Reinhold Barlian
Martin Fischle
Karl-Heinz Lux
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT84109896T priority Critical patent/ATE59244T1/de
Publication of EP0141099A2 publication Critical patent/EP0141099A2/de
Publication of EP0141099A3 publication Critical patent/EP0141099A3/de
Application granted granted Critical
Publication of EP0141099B1 publication Critical patent/EP0141099B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F9/00—Devices preventing sparking of machines or apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/12—Flameproof or explosion-proof arrangements
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V31/00—Gas-tight or water-tight arrangements
    • F21V31/04—Provision of filling media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00

Definitions

  • the invention relates to an explosion-proof electrical signaling device with the features of the preamble of claim 1.
  • a warning lamp is known from the USA 4142179, which can be used in potentially explosive areas. This large-volume warning lamp is not intended for installation in a control cabinet or the like.
  • the lamp comprises a lighting element and control means which are electrically connected to the lighting element and are provided in a housing.
  • the housing has a passage that extends from the interior to the potentially explosive atmosphere and is so narrow that the atmosphere cannot enter the interior, but in the event of a short circuit, any hot gases can escape, which cool down, so that none Explosion can occur.
  • three quenching chambers are provided in the warning lamp for cooling the gas.
  • a control circuit is located in an explosion-proof enclosure of the warning lamp housing, which is connected upstream of the warning lamp. The prevention of an explosion in the event of damage is not achieved by electrotechnical intrinsic safety measures, but by fluidic cooling of the hot gases in the narrow threaded gaps of the warning lamp.
  • an explosion-proof indicator light is known, the light elements of which can consist of LEDs.
  • the light source is provided in a holder, in the explosion-proof interior of which the connections of the light source and a connecting line are firmly connected.
  • the interior is filled with casting resin.
  • the object of the invention is to develop a signaling device of the type described at the outset with the features of the preamble of claim 1 in such a way that pressure-resistant encapsulation is saved in the area of the device head and high intrinsic safety against explosion risk is achieved with simple means and the device head can be fastened in a control cabinet wall hole at any time can be assembled and disassembled or replaced in a potentially explosive atmosphere without special tools.
  • a western advantage is that there is a high level of electrical intrinsic safety against the risk of explosion, which means that pressure-tight encapsulation of the device head area is not necessary.
  • Another significant advantage is that the device head can be easily installed or replaced by hand in the potentially explosive area without the aid of special tools.
  • a separate insert body is provided, which is screwed to a front ring from behind and from the front.
  • a holding frame detachably connected to the device head is provided for the housing. A quickly connectable coaxial plug connection between the housing and the device head is achieved via a feed part.
  • the device head 1 shown in Fig. 1 is releasably attached to the front wall 2 of a cabinet or the like without special tools.
  • the device head has an insert body 3 which penetrates a hole 4 in the wall 2.
  • the insert body has a shoulder 5 which is supported on the outside 6 of the wall 2 with the interposition of a rubber-elastic seal 7.
  • a fastening nut 9, which is mounted on a threaded part 10 of the insert body 3, is screwed against the inside 8 of the wall 2.
  • the device head 1 also has a front ring 11 which is screwably mounted on a thread 12 formed on the shoulder 5 of the insert body 3 in the direction toward the outside 6 of the wall 2 and thereby overlaps a translucent cover 13 on its circumference and against the insert body 3 sets with the interposition of an elastic sealing washer 14.
  • the translucent cover 13 covers a lens 15, for example in the colors red, green, blue, yellow, etc., which in turn covers a signaling part designed here as a lighting element 16.
  • the luminous element 16 is arranged in the region of a reflector 17, which in the present exemplary embodiment is preferably made of plastic and whose reflector surface is white. It may also be expedient to provide the reflector 17 with a metallic reflection layer, which can be produced, for example, by metallization in a high vacuum (metal vapor deposition).
  • the lighting element (16) is particularly advantageous here as an optoelectronic CERLED lightweight part executed by preferably six to eight CERLED components 19 are arranged on a carrier plate 18, it also being within the scope of the invention, less, for example three or four, or more, for example fifteen, CERLED on the carrier plate - Arrange components 19.
  • the CERLED components essentially consist of a small ceramic carrier on which an LED chip is attached.
  • the ceramic carrier of the CERLED component 19 can expediently be provided with a conductive coating on four sides (surface, underside and both end faces).
  • the ceramic carrier the dimensions of which can be, for example, about 3.2 by 1.27 by 0.6 millimeters, is bonded on the top with an LED chip.
  • a crystal-clear plastic lens about 0.6 millimeters high is arranged above the LED chip, which comprehensively protects the LED chip on the top of the ceramic carrier.
  • This module or CERLED component 19 can be attached to corresponding conductor tracks with its conductive underside and / or with the conductive end faces on the carrier plate 18. It is also possible to apply individual lighting parts directly to a larger ceramic circuit board, so that a CERLED lighting unit is thus formed.
  • the lighting element 16 can also have one or more glow lamps, incandescent lamps, filaments, light-emitting diodes and the like.
  • the entire light-emitting element 16 is embedded in the reflector 17 in a casting part 20 which is translucent, so that the light emitted by the lighting element 16 can radiate through the casting part 20, the lens 15 and the cover 13 to the outside.
  • the reflector 17 is associated with a luminaire housing 21, the base wall 22 of which is penetrated by a contact bolt 23 which projects out of the insert body 3 at the bottom.
  • the contact pin 23 has an inner axial conductor 24, from which a connecting conductor 25 is guided to the lighting element 16.
  • the axial conductor 24 is located in a tubular insulating sleeve 26 which is somewhat shorter than the axial conductor 24, so that an upper connection end for the connecting conductor 25 and a lower contact part protrude on the opposite end faces of the insulating sleeve 26.
  • the insulating sleeve 26 is in turn surrounded by a metallic sleeve conductor 27, which is somewhat shorter than the insulating sleeve 26, so that the latter protrudes from the sleeve conductor 27 on both ends.
  • the sleeve conductor 27 has a collar 28 which rests in the lamp housing 21 on the inner surface of the base wall 22 for support.
  • a further connecting conductor 29 is preferably connected to the collar 28 by means of a solder connection, which is also led to the lighting element 16.
  • a housing 30 is associated with the device head 1, as is shown essentially in FIGS. 2 and 3.
  • the device head 1 is releasably attached to the housing 30 or detachably coupled to the housing 30, so that a complete signaling device 31 is provided in the coupling state.
  • the contact pin 23 of the device head 1 is located in a pipe socket 32 of the housing 30.
  • the pipe socket 32 and the contact pin 23 inserted therein together form a supply part 33 for the voltage supply to the signaling part or lighting element 16.
  • the pipe socket 32 has an insertion bevel 34 for the contact bolt 23 on the free inner edge area facing the device head 1.
  • an end flange 35 is formed which is supported on an inner surface of the housing 30.
  • a closure cap 36 is arranged in the region of the end flange 35, which closes the pipe socket 32 at its lower end region.
  • the closure cover 36 has on its side facing the interior of the pipe socket 32 a trough 37 into which the free end of the contact bolt 23 or the auxiliary conductor 24 protruding from the device head 1 can penetrate.
  • two electrically conductive base webs 38, 38 ′ are arranged, which are diametrically opposite one another and extend in the longitudinal direction of the pipe socket 32.
  • the base webs 38, 38 ' are overlapped at their free ends pointing in the direction of the housing head 1 by inwardly projecting wall parts 39 of the tube mount 32, thereby ensuring that the base webs 38, 38' are firmly held in the tube mount 32.
  • the base web 38 is somewhat shorter than the opposite base web 38 '.
  • a contact spring 40 formed integrally with the material is located on the base web 38, while a further contact spring 40 'is formed on the base web 38'.
  • the contact springs 40, 40 ' are directed obliquely inwards towards the center of the axis and the closure cover 36 of the pipe socket 32, so that the contact bolt 23 of the device head 1 can be inserted into the pipe socket 32 without hindrance and a permanent bending of the contact springs 40, 40' is avoided is.
  • the contact springs 40, 40 ' have corresponding contact tips at their free ends, the contact tip of the contact spring 40 resting on the free end region of the axial conductor 24 and the contact tip of the other contact spring 40' resting on the outer surface of the sleeve conductor 27.
  • Conductor connections 41, 41 ' are formed on the base webs 38, 38' and, in the present exemplary embodiment, in the region of the closure cover 36 are guided outwards at right angles in opposite directions out of the pipe socket 32.
  • Connections 42, 42 ′′, which lead to an electronic circuit board 43, are connected to the conductor connections 41, 41 ′.
  • the pipe socket 32 is surrounded on its outer circumference by a pressure piece 44 which is guided axially displaceably on the pipe socket 32 in its longitudinal direction.
  • the pressure piece 44 is spring-loaded in that a helical compression spring 45, which also surrounds the pipe socket 32, is supported at one end on the housing 30 and at the other end in a Ring groove of the pressure piece 44 engages and the latter pushes upwards towards the device head 1.
  • the housing 30 has an approximately hood-shaped holding frame 46, which is connected to the housing 30 by means of a releasable locking or clip lock.
  • a spring clip 47 is provided, which effects the releasable coupling between the device head 1 and the housing 30.
  • An explosion-proof, pressure-resistant space 48 is located under the pipe socket 32, approximately in the central region of the housing 30. At least one voltage limiter and a current limiter (not visible here) are stored in this pressure-proof space 48, so that the voltage supplied to the lighting element 16 in the device head 1 corresponds to the explosion protection Intrinsic safety (EN 50020) is limited to a maximum of 18 V and the maximum permissible current flowing here is limited to a maximum of 30 mA.
  • This provides a high level of explosion protection with simple means, without the device head 1 being subject to a special encapsulation and special fastening, but instead being able to be safely disconnected from the housing at any time without the voltage having to be switched off and other safety precautions being taken.
  • the device head 1 with the signaling part 16 and the feed part 33 is thus designed as an explosion protection intrinsic safety unit 49, starting from the outputs of the upstream voltage and current limiters in the pressure-resistant space 48.
  • the voltage limiter in the pressure-resistant space 48 of the housing 30 can advantageously be formed from two Zener diodes connected in parallel, while the current limiter can consist of an appropriately dimensioned resistor. Instead of the resistor, however, an electronic current limiter can also be provided.
  • the voltage limiter and the current limiter are expediently arranged on the electronic circuit board 43 in the pressure-resistant space 48.
  • a transformer 50 can also be arranged in the pressure-proof space 48, which, for example, transforms a higher voltage supplied to the signaling device 31 down to the operating voltage supplied to the signaling part 16.
  • a rectifier 51 can be arranged on the electronic circuit board 43, via which an AC voltage introduced is rectified for the operation of the lighting element 16.
  • it can be expedient to provide an electronic fuse 53 on the electronic circuit board 43 which can preferably be designed as a fuse.
  • the voltage limiter, the current limiter, the electronic circuit board 43, the transformer 50, the rectifier 51, the electrical fuse 52 and the connections 42, 42 ' are enclosed by a casting resin 53, so that a secure sealing seal against an explosion hazard.
  • An epoxy resin or a polyurethane can expediently be provided as the casting resin.
  • the casting resin 53 may be expedient to set the casting resin 53 or to select different designs in such a way that the parts stored in the pressure-resistant space 48, such as voltage limiters, current limiters, circuit board 43, transformer 50, rectifier 51 and electrical fuse 52, directly from an elastic, flexible wall area of the casting resin 53 or the like are enclosed and that the actual solid casting resin potting is subsequently formed on this elastic wall area. Due to the elastic wall area, a high level of serviceability is achieved even under extreme loads, such as vibrations and fluctuating temperature intervals, so that a high degree of long-term functionality is ensured in any case.
  • the parts stored in the pressure-resistant space 48 such as voltage limiters, current limiters, circuit board 43, transformer 50, rectifier 51 and electrical fuse 52, directly from an elastic, flexible wall area of the casting resin 53 or the like are enclosed and that the actual solid casting resin potting is subsequently formed on this elastic wall area. Due to the elastic wall area, a high level of serviceability is achieved even under extreme loads, such as vibrations and fluctuating temperature intervals,
  • a latching device 54 is arranged above the pressure-proof space 48 to the right of the pipe socket 32, which has two switching locks for a shift lever by means of a corresponding link guide.
  • the locking device 54 is assigned to the pressure piece 44 and is actuated by this.
  • a stroke compensation part 55 is actuated via the pressure piece 44, which has a pot bolt 56 in which a helical compensation spring 57 is mounted.
  • the stroke compensation part 55 is covered at the top by the holding frame 46.
  • a plunger 59 which penetrates the wall 61 in an axially displaceable manner in a cylindrical, explosion-proof gap passage 60 and projects into an explosion-proof, pressure-tightly encapsulated chamber 62.
  • this chamber 62 is located to the right of the pressure-proof space 48 or next to the electrical fuse 52.
  • a microswitch 63 is mounted in the pressure-proof chamber 62, and the plunger 59 acts against the switching pin 64 thereof. For certain switching functions, it may be expedient to arrange two microswitches in the chamber 62.
  • the pressure-resistant chamber 62 like the pressure-resistant space 48, is encapsulated with explosion-proof casting resin 53.
  • the end of a hose line 65 is cast in the casting resin 53 in the area under the pressure-resistant space 48.
  • the hose line 65 has individual conductors 66 which are associated with the corresponding electrical functional parts in the housing 30.
  • a further electrical component for a further function can advantageously be used in the free spaces, in particular in the pressure-resistant chamber 62. It can also be advantageous to supply the supplied voltage at the correct level (18 V) so that the transformer 50 in the pressure-resistant space 48 can be saved. In this case, the resulting free space can be used advantageously for other parts, such as electronic components (control elements, relays, microprocessors, etc.). This provides further expedient possible uses for the signaling device 31 according to the invention.
  • the housing 30 in contrast to the housing 30 of FIG. 2, the housing 30 'has line terminals 67, to which conductor parts 68 are associated, which are embedded in the casting resin 53. No hose line is provided here, but the housing 30 'can be connected to busbars or the like.
  • the signaling device 31 also has a device head 1 'which is designed as an explosion-protected illuminated pushbutton, switching light unit or light switch attachment.
  • the lamp housing 21, in which the lighting element 16 is mounted is designed somewhat differently.
  • the lens 15 ' is surrounded by a rubber-elastic sleeve 69 and mounted on a push button 70 which is axially displaceable in the direction against the housing 30' in the device head 1 '.
  • a pressure sleeve 71 is assigned to the pushbutton 70 in the insert body 3.
  • This pressure sleeve 71 has a helical spring 72 and acts upon actuation of the push button 70 against the pressure piece 40 surrounding the pipe socket 32, through which the switching stroke is transmitted via the latching device 54, the stroke compensation part 55 and the plunger 59 to the microswitch 63. It is therefore realized in this embodiment, a pressure switch signaling device, which has a light element 16 in the push button 70 for display, the feed part to the device head 1 'and this itself being fully explosion-proof, so that no additional safety precautions are necessary.
  • the device head 1 'with the lighting element 16 and the push button 70 is designed in particular as an explosion-protected switching light unit, which, independently of the proposed invention, already has the particular advantage in itself that a switch or button and a light unit are integrated into a single structural unit are explosion-proof.
  • an explosion protection switching light unit is not yet known.
  • a temperature fuse in the pressure-tightly encapsulated space 48. This ensures that a maximum outside temperature of, for example, 80 ° C is never exceeded.
  • Another essential feature of the invention is that in the device head 1, 1 'different colored and different types of light displays can be replaced easily and without special safety precautions, so that an optimal function display can always be achieved according to the respective requirements.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • Electromagnetism (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Emergency Alarm Devices (AREA)
  • Audible And Visible Signals (AREA)
  • Burglar Alarm Systems (AREA)
  • Casings For Electric Apparatus (AREA)
  • Alarm Systems (AREA)
  • Telephone Function (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
EP84109896A 1983-09-14 1984-08-20 Meldegerät Expired - Lifetime EP0141099B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84109896T ATE59244T1 (de) 1983-09-14 1984-08-20 Meldegeraet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3333135A DE3333135C2 (de) 1983-09-14 1983-09-14 Explosionsgeschütztes elektrisches Meldegerät
DE3333135 1983-09-14

Publications (3)

Publication Number Publication Date
EP0141099A2 EP0141099A2 (de) 1985-05-15
EP0141099A3 EP0141099A3 (en) 1987-08-12
EP0141099B1 true EP0141099B1 (de) 1990-12-19

Family

ID=6209031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84109896A Expired - Lifetime EP0141099B1 (de) 1983-09-14 1984-08-20 Meldegerät

Country Status (5)

Country Link
US (1) US4600977A (enrdf_load_stackoverflow)
EP (1) EP0141099B1 (enrdf_load_stackoverflow)
JP (1) JPS6095698A (enrdf_load_stackoverflow)
AT (1) ATE59244T1 (enrdf_load_stackoverflow)
DE (2) DE3333135C2 (enrdf_load_stackoverflow)

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* Cited by examiner, † Cited by third party
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DE3531052A1 (de) 1985-08-30 1987-03-12 Bbc Brown Boveri & Cie Leuchtdrucktaster
DE3844484C2 (de) * 1988-12-31 1993-10-14 Priesemuth W Tastschalter
DE8908885U1 (de) * 1989-07-21 1990-11-15 Barlian, Reinhold, Dipl.-Ing. (FH), 97980 Bad Mergentheim Elektrotechnische Einrichtung
WO1994013004A1 (en) * 1992-12-02 1994-06-09 Emc Corporation Inrush current limiter
US5722767A (en) * 1996-10-22 1998-03-03 Formosa Industrial Computing Inc. LED display panel structure
DE19809253A1 (de) * 1998-03-05 1999-09-09 Aqua Signal Ag Unterflurleuchte und Gruppe von Unterflurleuchten
EP0945714B1 (de) * 1998-03-17 2010-10-20 Endress+Hauser (Deutschland) AG+Co. KG Elektronisches Gerät für den Einsatz in explosionsgefährdeten Bereichen
DE19838492A1 (de) * 1998-08-25 2000-03-09 Stahl R Schaltgeraete Gmbh Explosionsgeschützte Steckverbindungsanordnung
US7048423B2 (en) * 2001-09-28 2006-05-23 Visteon Global Technologies, Inc. Integrated light and accessory assembly
US6974234B2 (en) * 2001-12-10 2005-12-13 Galli Robert D LED lighting assembly
DE10210919B4 (de) * 2002-03-13 2006-07-27 Bartec Gmbh Meldeleuchte
DE10210984B4 (de) * 2002-03-13 2008-04-30 Bartec Gmbh Meldeleuchte
US20080025030A9 (en) * 2003-09-23 2008-01-31 Lee Kong W Ceramic packaging for high brightness LED devices
US7854535B2 (en) * 2003-09-23 2010-12-21 Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. Ceramic packaging for high brightness LED devices
TWM353308U (en) * 2008-06-09 2009-03-21 qiu-shuang Ke LED illumination device
US8408724B2 (en) * 2008-12-26 2013-04-02 Toshiba Lighting & Technology Corporation Light source module and lighting apparatus
EP2365525A3 (en) * 2010-03-12 2013-05-29 Toshiba Lighting & Technology Corporation Illumination apparatus having an array of red and phosphour coated blue LEDs
DE102013111374A1 (de) 2013-10-15 2015-04-16 R. Stahl Schaltgeräte GmbH Explosionsgeschützte Anordnung für elektrische und/oder elektronische Bauelemente
CN103648249B (zh) * 2013-12-19 2016-03-02 王轶丹 电器呼吸防爆方法及呼吸防爆柜
RU2698700C1 (ru) * 2015-09-09 2019-08-29 Фишер Контролз Интернешнел Ллс Модули визуального индикатора для применения с панелями управления и связанные с ними способы
CN108709114B (zh) * 2018-05-25 2020-09-08 东阳市维创工业产品设计有限公司 一种具有散热功能防护性能好的灯具防护装置
GB2587199B (en) * 2019-09-17 2021-11-03 Caterpillar Global Mining Europe Gmbh Warning device for control module
CN113819415A (zh) 2020-06-15 2021-12-21 伊顿智能动力有限公司 防爆照明设备

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DE1180444B (de) * 1962-09-12 1964-10-29 Merten Geb Elektrischer Schalter mit auswechselbarem Druckknopf
DE1962550U (de) * 1967-04-15 1967-06-22 Neumann Elektronik Gmbh Explosionsgeschuetztes fernsprech-, wechselsprech-, gegensprech- oder lautsprechgeraet.
DE1949791B2 (de) * 1969-10-02 1980-01-24 Neumann Elektronik Gmbh, 4330 Muelheim Schaltung fuer Anruf- und Besetztmeldung in WL-Anlagen
US4142179A (en) * 1971-04-19 1979-02-27 Lowndes Roy B W Safety warning lamps for adverse or hazardous atmospheres
CH542401A (de) * 1971-08-19 1973-09-30 Mueller Max Niederspannungsleuchte
DE2531968C2 (de) * 1975-07-17 1986-02-13 R. Stahl Schaltgeräte GmbH, 7118 Künzelsau Explosionsgeschützter Leuchtmelder
GB1559495A (en) * 1976-04-06 1980-01-23 Gossling C C Electrically illuminated push buttons and indicators
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US4435744A (en) * 1981-08-10 1984-03-06 Pauluhn Electric Manufacturing Co., Inc. Explosion-proof fluorescent light fixture

Also Published As

Publication number Publication date
EP0141099A2 (de) 1985-05-15
ATE59244T1 (de) 1991-01-15
DE3333135C2 (de) 1989-06-08
JPH0410674B2 (enrdf_load_stackoverflow) 1992-02-26
JPS6095698A (ja) 1985-05-29
DE3333135A1 (de) 1985-03-28
DE3483773D1 (de) 1991-01-31
EP0141099A3 (en) 1987-08-12
US4600977A (en) 1986-07-15

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