WO1997033259A1 - Intrinsically safe emergency light and sound system - Google Patents

Intrinsically safe emergency light and sound system Download PDF

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Publication number
WO1997033259A1
WO1997033259A1 PCT/AU1996/000577 AU9600577W WO9733259A1 WO 1997033259 A1 WO1997033259 A1 WO 1997033259A1 AU 9600577 W AU9600577 W AU 9600577W WO 9733259 A1 WO9733259 A1 WO 9733259A1
Authority
WO
WIPO (PCT)
Prior art keywords
intrinsically safe
sound system
emergency light
item
opera
Prior art date
Application number
PCT/AU1996/000577
Other languages
French (fr)
Inventor
Mitchell Frank Jakeman
Original Assignee
J-Lec Systems Pty. Limited
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 J-Lec Systems Pty. Limited filed Critical J-Lec Systems Pty. Limited
Publication of WO1997033259A1 publication Critical patent/WO1997033259A1/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
    • G08B7/066—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources guiding along a path, e.g. evacuation path lighting strip
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B3/00—Devices or single parts for facilitating escape from buildings or the like, e.g. protection shields, protection screens; Portable devices for preventing smoke penetrating into distinct parts of buildings
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F11/00—Rescue devices or other safety devices, e.g. safety chambers or escape ways

Definitions

  • FIG 1 SHOWS AN EXAMPLE OF THE INTRINSICALLY SAFE LIGHT AND SOUND SYSTEM ACCORDING TO THIS INVENTION INCLUDING MOUNTING BRACKET, ROOF BOLT MOUNTING, CA TENARY BRACKET MOUNTING, AND MOUNTING SLOT.
  • FIG 2 SHOWS THE IP 54 RA TED METAL ENCLOSURE.
  • FIG 3 SHOWS THE IP54 RA TED METAL ENCLOSURE LID AND GLASS WINDOW.
  • FIG 4 SHOWS THE PRINTED CIRCUIT BOARD WITH ARRANGEMENT OF LIGHT EMITTING DIODES.
  • FIG 5 SHOWS THE APPLICA ⁇ ON OF THE SYSTEM TO A MINE SITU A TION AND INCLUDES INTRINSICALY SAFE POWER SUPPLY UNIT, INTRINSICALLY SAFE CABLE, CONTROL UNIT AND DISPLAY UNITS.
  • FIG 6 SHOWS THE CONTROL UNIT PRINTED CIRCUIT BOARD, INTRINSICALLY SAFE NI-CAD BA TTERY AND SPEAKER.
  • FIG 7 SHOWS THE 1P54 RA TED METAL ENCLOSURE LID WITH GLASS WINDOW AND METAL RETAINING BRACKET
  • FIG 8 SHOWS THE SIDE VIEW OF THE IP54 RA TED METAL ENCLOSURE LID, SIDE VIEW OF THE GLASS WINDOW, AND THE ASSEMBLY OF RETAINING BRACKET
  • FIG 9 SHOWS THE LAYOUT OF THE CERTIFICATION LABEL.
  • FIG 10 SHOWS THEPOSI ⁇ ONOF THE CERTIFICATION LABEL ON THE POWER DISTRIBUTOR UNIT TAKEN FROM FRONT AND SIDE VIEW.
  • FIG 11 SHOWS THE POSITION OF THE CER ⁇ FICA TIONIABEL ON THE CONTROL UNIT AND DISPLA Y UNITS TAKEN FROM FRONT AND SIDE
  • FIG I IT CAN BE SEEN THA T THE INTRINSICALLY SAFE LIGHT AND SOUND SYSTEM IS MOUNTED AND BRACKETED :
  • ITEM 1 ENCLOSURE MOUNTING BRACKET.
  • ITEM 2 ROOF BOLT MOUNTING HOLE 32MM DIAMETER.
  • ITEM 3 CA TENARY BRACKET MOUNTING HOLE 8MM DIAMETER.
  • ITEM 4 BRACKET MOUNTING SLOT 14MM WIDE.
  • FIG 2 THE PHYSICAL DIMENSIONS OF THE IP 54 RA TED METAL ENCLOSURE CAN BE SEEN :
  • IP54 RATED METAL ENCLOSURE REFERENCING FIG 3: THE LA YOUTAND DIMENSIONS OF THE METAL LID AND GLASS WINDOW OF THE IP54 RA TED METAL ENCLOSURE CAN BE
  • ITEM 7 GLASS WINDOW 65MM DIAMETER HOLE.
  • ITEM 8 PRINTED CIRCUIT BOARD.
  • ITEM 9 1200MCD RED LIGHT EMITTING DIODES.
  • FIG 5 IT CAN BE SEEN HOW THE INTRINSICALLY SAFE LIGHT AND SOUND SYSTEM OPERATES FROM SURFACE POWER VIA CABLE CONNEC ⁇ ON THROUGH TO CONTROL AND DISPLAY UNITS :
  • ITEM 10 240V AC TO 12VDC INTRINSICALLY SAFE POWER SUPPLY.
  • ITEM 11 INTRINSICALLY SAFE HEA VY DU ⁇ CABLE CARRYING 12VDC AT UP TO 2A.
  • ITEM 12 CONTROL UNIT ENCLOSURE CONTAINING BA TTERY SPEAKER AND PRINTED CIRCUIT BOARD.
  • ITEM 13 DISPLA Y UNITS WITH PRINTED CIRCUIT BOARD.
  • REFERENCING FIG 6 IT CAN BE SEEN HOW THE CONTROL UNIT IS LAID OUT WITH PRINTED CIRCUIT BOARD, INTRINSICALLY SAFE NI-CAD BA TTERYAND SPEAKER HOUSED WITHIN THE IP 54 RA TED METAL ENCLOSURE :
  • ITEM 15 INTRINSICALLY SAFE NI-CAD BA TTERY.
  • ITEM 16 SPEAKER - PROVIDES A UDIBLE WARNING TONES.
  • ITEM 17 GLASS WINDOW, 85MM DIAMETER.
  • ITEM 18 ENCLOSURE METAL LID - BOTTOM VIEW.
  • FIG 8 IT CAN BE SEEN FROM THE SIDE VIEW HOW THE IP 54 RA TED METAL ENCLOSURE LID IS LAID OUT :
  • ITEM 20 M4 PFH FASTENERS.
  • ITEM 21 ENCLOSURE METAL LID - SIDE VIEW.
  • ITEM 22 M4 HEX NUTS.
  • ITEM 23 GLASS WINDOW 3MM THICK.
  • ITEM 24 WINDOW METAL RETAINING BRACKET - SIDE VIEW.
  • ITEM 25 M4 STAR LOCK WASHERS.
  • ITEM 26 M4 HEX NUTS.
  • FIG 9 IT CAN BE SEEN HOW THE CERTIFICA TION LABEL IS AFFIXED EVIDENCING STA TVS AS AN APPROVED INTRINSICALLY SAFE LIGHT AND SOUND EGRESS SYSTEM :
  • FIG 10 IT CAN BE SEEN HOW THE CER ⁇ FICA TION LABEL IS AFFIXED TO THE POWER DISTRIBUTOR UNIT FROM FRONT AND SIDE VIEW :
  • ITEM 27 FRONT VIEW - POWER DISTRIBUTOR UNIT.
  • ITEM 28 LABEL POSITION - POWER DISTRIBUTOR UNIT.
  • ITEM 29 SIDE VIEW - POWER DISTRIBUTOR UNIT.
  • FIG 11 IT CAN BE SEEN HOW THE CERTIFICATION LABEL IS AFFIXED TO THE CONTROL UNIT AND THE DISPLAY UNITS FROM FRONT AND SIDE VIEW :
  • ITEM 30 FRONT VIEW - CONTROL UNIT AND DISIA Y UNIT
  • ITEM 31 CONTROL UNIT AND DISPLA Y UNIT - LABEL POSITIONING.
  • ITEM 32 SIDE VIEW - CONTROL UNIT AND DISPLA Y UNIT.
  • ITEM 33 ENCLOSURE MOUNTING BRACKET.

Abstract

An intrinsically safe emergency light and sound system comprising an impact resistant IP54 rated steel enclosure in which high intensity light emitting diodes are housed (13) together with a speaker (16). Their operation is controlled by a printed circuit board (14) and can be powered by an internal rechargeable battery (15). Enclosures are grouped in sets of three at intervals of five metres and connected by intrinsically safe heavy duty cable (11), and each set is located at intervals of between twenty and forty metres. When an incident or an explosion occurs causing smoke and dust the system can be activated by a switch signal to a remote trigger board. Alternatively when mains power is switched off the system will be activated, and sequentially flashing lights and audible tones set at a different pitch between sets will commence to operate. The system directs those who suffer reduced visibility and disorientation, due to smoke and dust, towards the safest direction of egress. Due to independence and severability of each set in the system, damage or removal of any one set will not disable the other sets from operating.

Description

INTRINSICALLY SAFE EMERGENCY LIGHT AND SOUND SYSTEM
THE INTRINSICALLY SAFE EMERGENCY LIGHT AND SOUND SYSTEM PROVIDES A LEAD LIGHT SYSTEM THAT COMPRISES HIGH INTENSITY LIGHT EMITTING DIODES OPERA TING IN TANDEM WITH A UDIBLE TONES
HOUSED IN AN IMPACT RESISTANT SEALED METAL ENCLOSURE THA T CAN BE ACTIVA TED BY LOSS OF MAINS POWER OR LOCAL CONTROL OR REMOTE RADIO SIGNAL IN AN EMERGENCY TO ASSIST MINERS LOCA TE A SAFE EXIT FROM MINE GALLERIES FILLED WITH SMOKE AND DUST WHICH MAY FOLLOW FIRE OR EXPLOSIONS OR BOTH IN MINES.
IN ONE FORM THE SYSTEMS USES HIGH INTENSITY LIGHT EMITTING DIODES AFFIXED IN AN INTRINSICALLY SAFE IMPACT RESISTANT SEALED METAL ENCLOSURE RA TED TO STANDARD IP 54 STRUNG ALONG THE HEAD OF THE MINE GALLERY IN A CONFIGURAΗON THAT PROVIDES DIRECπONAL FLASHING ARROWS TOWARDS THE DIRECTION TO THE EXIT.
IN ANOTHER FORM AND OPERATING SIMULTANEOUSLY DIRECTIONAL INSTRUCTIONS ARE PROVIDED BY SEQUENTIAL HIGH PITCHED A UDIO TONES EMITTED FROM A SPEAKER HOUSED WITHIN THE SEALED ENCLOSURE WITH THE NUMBER OF PULSES VARIABLE BETWEEN SETS AND PROGRAMMED TOWARDS THE DIRECTION OF THE DESIGNA TED EXI
THE LIGHTS AND AUDIBLE SIGNALS ARE ACTIVATED BY EITHER LOSS OF MAINS POWER WHICH IS FED INTO AN INDUSTRY STANDARD INTRINSICALLY SAFE 240VAC/12VDC POWER SUPPLY UNIT OR BY LOCAL CONTROL.
POWER TO EACH CONTROL UNIT IS PROVIDED BY AN INTERNAL 4.8VDC INTRINSICALLY SAFE NI-CAD BATTERY WHICH WILL PROVIDE POWER FOR TWO HOURS AND CAN BE RECHARGED WHEN MAINS POWER IS RESTORED. THE HIGH INTENSITY LIGHT EMITTING DIODES ARE MADE FROM GALLIUM ARSENIDE PHOSPHIDE SILICON SUBSTRA TE WITH PLASΗC LENS AND ARE ASSEMBLED TOGETHER WITH NICKEL COATED COPPER LEADS WHILE THE HIGH PITCHED A UDIBLE SOUNDS EMANA TE FROM A SPEAKER HOUSED WITHIN EACH IMPACT RESISTANT METAL UNIT WITH A CLEAR GLASS
WINDOW RATED TO IP54 STANDARD.
TO ASSIST WITH UNDERSTANDING THE INVENTION REFERENCE WILL NOW BE MADE TO THE ACCOMPANYING DRA WINGS WHICH SHOW AN EXAMPLE OF THE INVENTION.
IN THE DRA WINGS:
FIG 1: SHOWS AN EXAMPLE OF THE INTRINSICALLY SAFE LIGHT AND SOUND SYSTEM ACCORDING TO THIS INVENTION INCLUDING MOUNTING BRACKET, ROOF BOLT MOUNTING, CA TENARY BRACKET MOUNTING, AND MOUNTING SLOT.
FIG 2: SHOWS THE IP 54 RA TED METAL ENCLOSURE.
FIG 3: SHOWS THE IP54 RA TED METAL ENCLOSURE LID AND GLASS WINDOW.
FIG 4: SHOWS THE PRINTED CIRCUIT BOARD WITH ARRANGEMENT OF LIGHT EMITTING DIODES.
FIG 5: SHOWS THE APPLICA ΩON OF THE SYSTEM TO A MINE SITU A TION AND INCLUDES INTRINSICALY SAFE POWER SUPPLY UNIT, INTRINSICALLY SAFE CABLE, CONTROL UNIT AND DISPLAY UNITS.
FIG 6: SHOWS THE CONTROL UNIT PRINTED CIRCUIT BOARD, INTRINSICALLY SAFE NI-CAD BA TTERY AND SPEAKER. FIG 7: SHOWS THE 1P54 RA TED METAL ENCLOSURE LID WITH GLASS WINDOW AND METAL RETAINING BRACKET
FIG 8: SHOWS THE SIDE VIEW OF THE IP54 RA TED METAL ENCLOSURE LID, SIDE VIEW OF THE GLASS WINDOW, AND THE ASSEMBLY OF RETAINING BRACKET
FIG 9: SHOWS THE LAYOUT OF THE CERTIFICATION LABEL.
FIG 10: SHOWS THEPOSIΗONOF THE CERTIFICATION LABEL ON THE POWER DISTRIBUTOR UNIT TAKEN FROM FRONT AND SIDE VIEW.
FIG 11: SHOWS THE POSITION OF THE CERΗFICA TIONIABEL ON THE CONTROL UNIT AND DISPLA Y UNITS TAKEN FROM FRONT AND SIDE
VIEW.
REFERENCING FIG I: IT CAN BE SEEN THA T THE INTRINSICALLY SAFE LIGHT AND SOUND SYSTEM IS MOUNTED AND BRACKETED :
ITEM 1: ENCLOSURE MOUNTING BRACKET.
ITEM 2: ROOF BOLT MOUNTING HOLE 32MM DIAMETER.
ITEM 3: CA TENARY BRACKET MOUNTING HOLE 8MM DIAMETER.
ITEM 4: BRACKET MOUNTING SLOT 14MM WIDE.
REFERENCING FIG 2: THE PHYSICAL DIMENSIONS OF THE IP 54 RA TED METAL ENCLOSURE CAN BE SEEN :
ITEMS: IP54 RATED METAL ENCLOSURE. REFERENCING FIG 3: THE LA YOUTAND DIMENSIONS OF THE METAL LID AND GLASS WINDOW OF THE IP54 RA TED METAL ENCLOSURE CAN BE
SEEN :
ITEM 6: ENCLOSURE METAL LID.
ITEM 7: GLASS WINDOW 65MM DIAMETER HOLE.
REFERENCING FIG 4: THE LA YOIIT OF THE PRINTED CIRCUIT BOARD AND THE ARRAY OF THE LIGHT EMITTING DIODES CAN BE SEEN :
ITEM 8: PRINTED CIRCUIT BOARD.
ITEM 9: 1200MCD RED LIGHT EMITTING DIODES.
REFERENCING FIG 5: IT CAN BE SEEN HOW THE INTRINSICALLY SAFE LIGHT AND SOUND SYSTEM OPERATES FROM SURFACE POWER VIA CABLE CONNECΩON THROUGH TO CONTROL AND DISPLAY UNITS :
ITEM 10: 240V AC TO 12VDC INTRINSICALLY SAFE POWER SUPPLY.
ITEM 11 : INTRINSICALLY SAFE HEA VY DUΗ CABLE CARRYING 12VDC AT UP TO 2A.
ITEM 12: CONTROL UNIT ENCLOSURE CONTAINING BA TTERY SPEAKER AND PRINTED CIRCUIT BOARD.
ITEM 13: DISPLA Y UNITS WITH PRINTED CIRCUIT BOARD. REFERENCING FIG 6: IT CAN BE SEEN HOW THE CONTROL UNIT IS LAID OUT WITH PRINTED CIRCUIT BOARD, INTRINSICALLY SAFE NI-CAD BA TTERYAND SPEAKER HOUSED WITHIN THE IP 54 RA TED METAL ENCLOSURE :
ITEM 14: CONTROL UNIT PRINTED CIRCUIT BOARD.
ITEM 15: INTRINSICALLY SAFE NI-CAD BA TTERY.
ITEM 16: SPEAKER - PROVIDES A UDIBLE WARNING TONES.
REFERENCING FIG 7: IT CAN BE SEEN HOW THE INTERNAL REVERSE
SURFACE OF THE IP54 RA TED METAL ENCLOSURE IS VIEWED SHOWING GLASS WINDOW AND METAL RETAINING BRACKET :
ITEM 17: GLASS WINDOW, 85MM DIAMETER.
ITEM 18: ENCLOSURE METAL LID - BOTTOM VIEW.
ITEM 19: WINDOW METAL RETAINING BRA CKE
REFERENCING FIG 8: IT CAN BE SEEN FROM THE SIDE VIEW HOW THE IP 54 RA TED METAL ENCLOSURE LID IS LAID OUT :
ITEM 20: M4 PFH FASTENERS.
ITEM 21: ENCLOSURE METAL LID - SIDE VIEW.
ITEM 22: M4 HEX NUTS.
ITEM 23: GLASS WINDOW 3MM THICK. ITEM 24: WINDOW METAL RETAINING BRACKET - SIDE VIEW.
ITEM 25: M4 STAR LOCK WASHERS.
ITEM 26: M4 HEX NUTS.
REFERENCING FIG 9: IT CAN BE SEEN HOW THE CERTIFICA TION LABEL IS AFFIXED EVIDENCING STA TVS AS AN APPROVED INTRINSICALLY SAFE LIGHT AND SOUND EGRESS SYSTEM :
REFERENCING FIG 10: IT CAN BE SEEN HOW THE CERΗFICA TION LABEL IS AFFIXED TO THE POWER DISTRIBUTOR UNIT FROM FRONT AND SIDE VIEW :
ITEM 27: FRONT VIEW - POWER DISTRIBUTOR UNIT.
ITEM 28: LABEL POSITION - POWER DISTRIBUTOR UNIT.
ITEM 29: SIDE VIEW - POWER DISTRIBUTOR UNIT.
REFERENCING FIG 11: IT CAN BE SEEN HOW THE CERTIFICATION LABEL IS AFFIXED TO THE CONTROL UNIT AND THE DISPLAY UNITS FROM FRONT AND SIDE VIEW :
ITEM 30: FRONT VIEW - CONTROL UNIT AND DISIA Y UNIT
ITEM 31: CONTROL UNIT AND DISPLA Y UNIT - LABEL POSITIONING.
ITEM 32: SIDE VIEW - CONTROL UNIT AND DISPLA Y UNIT.
ITEM 33: ENCLOSURE MOUNTING BRACKET.

Claims

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:
(1) THE INTRINSICALLY SAFE EMERGENCY LIGHT AND SOUND SYSTEM PROVIDES AN AID TO SAFE EGRESS FOR PERSONNEL WORKING IN HAZARDOUS AREAS BEING CLASS I ZONE 1 AND CLASS 1 ZONE 0 WITHIN UNDERGROUND COAL MINES THA T OPERA TES DURING INCIDENT AND
EMERGENCY CONDITIONS BY PROVIDING LIGHTS AND SOUNDS DIRECTIONAL INDICA TORS ENCLOSED IN IP 54 RA TED ENCLOSURES AFFIXED ALONG THE HEAD OF THE GALLERY WHICH WILL LEAD PERSONNEL AWAY FROM THE INCIDENT TOWARDS SAFE AREAS.
(2) THE INTRINSICALLY SAFE EMERGENCY LIGHT AND SOUND SYSTEM OF CLAIM (1) OPERA TES TO PROVIDE SAFE EGRESS WHEN MAINS POWER AND LIGHΩNG IS LOST AND VISIBILITY IS REDUCED BY OPERA ΗNG INDEPENDENTLY FROM ITS OWN INTERNAL BA TTERY POWER SUPPLY.
(3) THE INTRINSICALLY SAFE EMERGENCY LIGHT AND SOUND SYSTEM OF CLAIM (1) OPERA TES A UTOMA ΩCALLY WHEN MAINS POWER IS
SWITCHED OFF OR WHEN ACΗVA TED BY REMOTE SWITCHING DEVICE.
(4) THE INTRINSICALLY SAFE EMERGENCY LIGHT AND SOUND SYSTEM OF CLAIM (1) PROVIDES FOR INDIVIDUAL AND SEPARA TE OPERA TION OF EACH UNIT IN A SEQUENCE AND IS NOT DISABLED AS A MEANS LOCA ΗNG SAFE EGRESS SHOULD ANY ONE UNIT IN THE SEQUENCE BE RENDERED INOPERABLE.
(5) THE INTRINSICALLY SAFE EMERGENCY LIGHT AND SOUND SYSTEM AS HEREIN DESCRIBED WITH REFERENCE TO THE ACCOMPANYING DRAWINGS.
PCT/AU1996/000577 1996-03-04 1996-09-13 Intrinsically safe emergency light and sound system WO1997033259A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPN8403 1996-03-04
AUPN8403A AUPN840396A0 (en) 1996-03-04 1996-03-04 Intrinsically safe emergency light and sound system

Publications (1)

Publication Number Publication Date
WO1997033259A1 true WO1997033259A1 (en) 1997-09-12

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PCT/AU1996/000577 WO1997033259A1 (en) 1996-03-04 1996-09-13 Intrinsically safe emergency light and sound system

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WO (1) WO1997033259A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001097913A1 (en) * 2000-06-19 2001-12-27 Richard Francis Mclean Warning and guidance apparatus
WO2004104971A1 (en) * 2003-05-23 2004-12-02 Dbt Gmbh Mine lighting device
CN103670505A (en) * 2012-09-24 2014-03-26 江苏凯力德科技有限公司 Gas compressing and spraying device of coal mine underground emergency system
CN105673077A (en) * 2016-01-19 2016-06-15 淮南师范学院 Coal mine safety warning device
DE102011103242B4 (en) 2011-06-03 2018-10-18 Marco Systemanalyse Und Entwicklung Gmbh Intrinsically safe lamp
CN110715216A (en) * 2019-11-23 2020-01-21 江苏蒂格机械科技有限公司 Special working state indicating device for underground coal mine

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001097913A1 (en) * 2000-06-19 2001-12-27 Richard Francis Mclean Warning and guidance apparatus
GB2380589A (en) * 2000-06-19 2003-04-09 Richard Francis Mclean Warning and guidance apparatus
GB2380589B (en) * 2000-06-19 2004-10-06 Richard Francis Mclean Warning and guidance apparatus
WO2004104971A1 (en) * 2003-05-23 2004-12-02 Dbt Gmbh Mine lighting device
GB2416240A (en) * 2003-05-23 2006-01-18 Dbt Gmbh Mine lighting device
GB2416240B (en) * 2003-05-23 2007-06-20 Dbt Gmbh Mining lamp
DE102011103242B4 (en) 2011-06-03 2018-10-18 Marco Systemanalyse Und Entwicklung Gmbh Intrinsically safe lamp
CN103670505A (en) * 2012-09-24 2014-03-26 江苏凯力德科技有限公司 Gas compressing and spraying device of coal mine underground emergency system
CN105673077A (en) * 2016-01-19 2016-06-15 淮南师范学院 Coal mine safety warning device
CN110715216A (en) * 2019-11-23 2020-01-21 江苏蒂格机械科技有限公司 Special working state indicating device for underground coal mine

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