EP2206950A1 - Wärmebeständiges Gehäuse - Google Patents

Wärmebeständiges Gehäuse Download PDF

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Publication number
EP2206950A1
EP2206950A1 EP10250019A EP10250019A EP2206950A1 EP 2206950 A1 EP2206950 A1 EP 2206950A1 EP 10250019 A EP10250019 A EP 10250019A EP 10250019 A EP10250019 A EP 10250019A EP 2206950 A1 EP2206950 A1 EP 2206950A1
Authority
EP
European Patent Office
Prior art keywords
intumescent material
heat
resistant
housing
resistant casing
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Withdrawn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
EP10250019A
Other languages
English (en)
French (fr)
Inventor
Peter Anthony Bridgwater
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.)
Scolmore International Ltd
Original Assignee
Scolmore International Ltd
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 Scolmore International Ltd filed Critical Scolmore International Ltd
Publication of EP2206950A1 publication Critical patent/EP2206950A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F21V25/125—Flameproof or explosion-proof arrangements using intumescent material, i.e. using materials which swells up as a result of heat exposure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • F21S8/026—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
    • 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
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/02—Wall, ceiling, or floor bases; Fixing pendants or arms to the bases
    • F21V21/04—Recessed bases

Definitions

  • This invention relates to a new fire resistant casing for use with electrical fittings, particularly for use with lamp holders.
  • New building regulations require down-lighters fitted into ceilings to be provided with fire hoods to prevent or at least minimise the spread of fire.
  • Various types of fire hood have been proposed which include a fire resistant intumescent material that upon excessive heating (e.g. in the event of a fire) expand to many times their original volume, thus forming a fire barrier to minimise or prevent fire spread.
  • These hoods have been quite successful, but the aim is still to increase the efficiency of the built-in ventilation and fire/heat protection, whilst providing a cost effective and easy to install option.
  • An object of the present invention is to provide a new heat resistant casing (fire hood) which can be supplied already fitted with a lamp holder or other electrical fitting and which in use is efficient at minimising heat build up and also in preventing or minimising fire spread, should that occur. It is known to use a disc of solid fire resistant intumescent material the same size and shape as the interior of the top of a housing ('can'), but this is expensive as the intumescent material itself is costly and there is a great deal of wastage.
  • a heat-resistant casing for an electrical fitting in which the casing comprises a housing of a self-supporting substantially rigid construction of heat resistant material having a top supporting one or more side-walls, the top is provided with at least one aperture, and a first solid fire-resistant intumescent material is positioned within the housing so that when used with an electrical fitting it will be between the interior surface of the top and the electrical fitting, characterised in that the first solid fire-resistant intumescent material is smaller in area than the interior surface of the top of the housing.
  • the housing is usually provided with attachment means for an electrical fitting so that it can be supplied as a 'lamp ready' product.
  • the housing is preferably of substantially circular cross-section and of metal or plastic.
  • the top preferably has a plurality of apertures for ventilation (heat dissipation), passage of electrical cables and attachment means for the first fire resistant intumescent material.
  • the 'free edge' of the side wall i.e. the side wall remote from the top, preferably has an outwardly extending lip. This lip may be used for attachment of a cover for the electrical fitting.
  • the housing is further provided with a collar of a second solid fire-resistant intumescent material which extends substantially completely around the exterior surface of the side wall or walls.
  • the casing is particularly applicable for recessing into a support structure such as a ceiling or wall, especially when the support structure is being constructed.
  • the intumescent material may be based on graphite or other intumescent materials which upon exposure to extreme heat expand in volume.
  • the thickness of the intumescent material is usually in the range 0.4mm to 6mm, preferably in the range 0.6mm to 2mm and advantageously in the range 0.8mm to 1.5mm.
  • a graphite based material is that supplied by Technical Fibre Products Limited as 'Intumescent Material' and consists of a high temperature Rockwool fibre mat containing easily dispersed foliating graphite bonded in acrylic.
  • a second intumescent material e.g. as a collar which extends substantially completely around the exterior surface of the side wall or walls, it may be of the same composition as the first intumescent material, or different.
  • the first intumescent material is usually a single component provided with at least one and advantageously a plurality of apertures. The apertures are for passage of electrical cables and/or for ventilation to dissipate heat that tends to build up in the casing when the electrical fitting is switched on.
  • the first solid fire-resistant intumescent material is spaced apart from the interior surface of the top so that there is a gap between it and the interior surface of the top of the housing.
  • a gap is preferably is in the range 2 to 8 mm, more preferably 2 to 5mm.
  • a plate is provided to support the first intumescent material, in which case the plate is usually provided with apertures, at least some of which coincide with those of the first intumescent material.
  • the apertures are conveniently circular holes punched through with a suitable tool.
  • the plate is preferably sized to fit snugly within the casing and may then be attached to the interior surface of the top by means of e.g. nuts and bolts. The nuts also serve to maintain the space (where desired) between the interior surface of the top and the first intumescent material supported on the plate.
  • At least one location means is preferably provided to aid location and retention of the first intumescent material in the assembly.
  • the location means could be one or more flanges positioned so that the intumescent material fits into a predetermined position.
  • a support plate is provided then that may be adapted to have location means e.g. there could be a plurality of upturned portions struck up from the plate by means of a suitable tool.
  • the shape of the first intumescent material is usually straight edged rather than curved and preferably triangular, advantageously an equilateral triangle as this offers the greatest cost saving and minimal waste. Alternatively it can be square or rectangular.
  • the area of the first intumescent material is preferably less than 75%, more preferably less than 50% and advantageously less than 25% of the internal surface area of the top of the housing. Where a plate is provided, this may conveniently be used for attachment of the electrical fitting e.g. by means of nuts and bolts.
  • the electrical fitting is preferably positioned within the housing so that it does not touch the internal surface of the side wall or walls.
  • the first picture shows how much intumescent material is wasted when a full circle is cut from a square sheet to fit completely over the inner surface of the top of a housing.
  • the second and third pictures show how much less intumescent material is used when an equilateral triangular or a square of intumescent material is cut to fit into a circular housing.
  • the triangle and the square have straight edges, there is far less wastage of intumescent material when these shapes are cut from a large sheet of such material.
  • 21% of the material is wasted.
  • a heat resistant casing 10 comprises a cylindrical pressed steel housing consisting of a top 11 supporting a side wall 12.
  • the side wall 12 has a lip 13 onto which may be clipped a cover (not shown) by means of spring clips 14a & 14b which are attached by a bracket 15 to the centre of the top 11.
  • a collar 16 of solid fire resistant intumescent material surrounds the side wall 12.
  • the collar 16 is 25mm high and 1 mm thick and is glued in place.
  • Within the housing is a steel plate 17 supporting a 1 mm thick layer of solid fire resistant intumescent material 18 in the shape of an equilateral triangle and positioned on the plate 17 by means of three locating flanges 19. Plate17 and layer 18 have corresponding apertures.
  • There is a gap between the top 11 and layer 18 which is chosen to be in the range 2 to 5mm.
  • the plate 17 is held in place by 4 nuts and bolts 20, which also keep the gap consistent.
  • a pressed steel lamp holder (not shown) can be attached to plate 17 by means of nuts and bolts.
  • the solid fire resistant intumescent material 18 expands to 9 times its volume, filling the gap between the top 11 and plate 17 and filling the aforementioned apertures. This expansion helps to prevent the fire from spreading e.g. to an upper floor when the housing is recessed into a ceiling.
  • the collar 16 of solid fire resistant intumescent material expands to nine times its volume, filling the space between the housing and the surrounding structure e.g. the ceiling. This expansion helps to prevent the fire from spreading.
  • the housing is of exactly the same construction as shown in Figures 2 and 3 but with a square intumescent material disc rather than a triangle. Using a square component allows the introduction of more apertures for cabling and/or ventilation.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Building Environments (AREA)
EP10250019A 2009-01-12 2010-01-07 Wärmebeständiges Gehäuse Withdrawn EP2206950A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0900420A GB0900420D0 (en) 2009-01-12 2009-01-12 Heat resistant casing

Publications (1)

Publication Number Publication Date
EP2206950A1 true EP2206950A1 (de) 2010-07-14

Family

ID=40379440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10250019A Withdrawn EP2206950A1 (de) 2009-01-12 2010-01-07 Wärmebeständiges Gehäuse

Country Status (3)

Country Link
EP (1) EP2206950A1 (de)
CN (1) CN201412785Y (de)
GB (2) GB0900420D0 (de)

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US10139059B2 (en) 2014-02-18 2018-11-27 DMF, Inc. Adjustable compact recessed lighting assembly with hangar bars
US9964266B2 (en) 2013-07-05 2018-05-08 DMF, Inc. Unified driver and light source assembly for recessed lighting
US11060705B1 (en) 2013-07-05 2021-07-13 DMF, Inc. Compact lighting apparatus with AC to DC converter and integrated electrical connector
US11255497B2 (en) 2013-07-05 2022-02-22 DMF, Inc. Adjustable electrical apparatus with hangar bars for installation in a building
US10753558B2 (en) 2013-07-05 2020-08-25 DMF, Inc. Lighting apparatus and methods
US11435064B1 (en) 2013-07-05 2022-09-06 DMF, Inc. Integrated lighting module
US10563850B2 (en) 2015-04-22 2020-02-18 DMF, Inc. Outer casing for a recessed lighting fixture
US10551044B2 (en) 2015-11-16 2020-02-04 DMF, Inc. Recessed lighting assembly
GB2515649B (en) * 2014-06-09 2015-10-14 Kosnic Lighting Ltd Fire resistant downlight
GB2517081B (en) * 2014-07-28 2015-11-18 Scolmore Int Ltd Light Fitting
CA3102022C (en) 2015-05-29 2023-04-25 DMF, Inc. Lighting module for recessed lighting systems
USD851046S1 (en) 2015-10-05 2019-06-11 DMF, Inc. Electrical Junction Box
GB2563040B (en) * 2017-05-31 2020-10-07 Luceco Plc Downlight assembly
US10488000B2 (en) 2017-06-22 2019-11-26 DMF, Inc. Thin profile surface mount lighting apparatus
USD905327S1 (en) 2018-05-17 2020-12-15 DMF, Inc. Light fixture
WO2018237294A2 (en) 2017-06-22 2018-12-27 DMF, Inc. THIN-PROFILE SURFACE MOUNTING LIGHTING DEVICE
US11067231B2 (en) 2017-08-28 2021-07-20 DMF, Inc. Alternate junction box and arrangement for lighting apparatus
CA3083359A1 (en) 2017-11-28 2019-06-06 DMF, Inc. Adjustable hanger bar assembly
WO2019133669A1 (en) 2017-12-27 2019-07-04 DMF, Inc. Methods and apparatus for adjusting a luminaire
USD877957S1 (en) 2018-05-24 2020-03-10 DMF Inc. Light fixture
WO2019241198A1 (en) 2018-06-11 2019-12-19 DMF, Inc. A polymer housing for a recessed lighting system and methods for using same
USD903605S1 (en) 2018-06-12 2020-12-01 DMF, Inc. Plastic deep electrical junction box
CA3115146A1 (en) 2018-10-02 2020-04-09 Ver Lighting Llc A bar hanger assembly with mating telescoping bars
USD1012864S1 (en) 2019-01-29 2024-01-30 DMF, Inc. Portion of a plastic deep electrical junction box
USD901398S1 (en) 2019-01-29 2020-11-10 DMF, Inc. Plastic deep electrical junction box
USD966877S1 (en) 2019-03-14 2022-10-18 Ver Lighting Llc Hanger bar for a hanger bar assembly
WO2021051101A1 (en) 2019-09-12 2021-03-18 DMF, Inc. Miniature lighting module and lighting fixtures using same
USD990030S1 (en) 2020-07-17 2023-06-20 DMF, Inc. Housing for a lighting system
CA3124976A1 (en) 2020-07-17 2022-01-17 DMF, Inc. Polymer housing for a lighting system and methods for using same
CA3125954A1 (en) 2020-07-23 2022-01-23 DMF, Inc. Lighting module having field-replaceable optics, improved cooling, and tool-less mounting features

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2088014A (en) * 1980-11-06 1982-06-03 Secr Defence Lagging Pipes
GB2297609A (en) * 1995-01-25 1996-08-07 Environmental Seals Ltd Ventilated covers for electic fittings
GB2325728A (en) * 1997-05-29 1998-12-02 Euro Passive Fire Protection L Fire-resistant, ventilated covers for electrical fittings
EP1688663A2 (de) * 2005-01-27 2006-08-09 RD Europe Limited Feuerbeständige Beleuchtungseinrichtung
WO2008093056A1 (en) * 2007-01-30 2008-08-07 Scolmore International Limited Fire resistant back box
GB2454028A (en) * 2007-10-18 2009-04-29 Nvc Fire rated electric light fitting

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201149181Y (zh) * 2007-12-11 2008-11-12 武良举 一种带散热装置的嵌入式灯具

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2088014A (en) * 1980-11-06 1982-06-03 Secr Defence Lagging Pipes
GB2297609A (en) * 1995-01-25 1996-08-07 Environmental Seals Ltd Ventilated covers for electic fittings
GB2325728A (en) * 1997-05-29 1998-12-02 Euro Passive Fire Protection L Fire-resistant, ventilated covers for electrical fittings
EP1688663A2 (de) * 2005-01-27 2006-08-09 RD Europe Limited Feuerbeständige Beleuchtungseinrichtung
WO2008093056A1 (en) * 2007-01-30 2008-08-07 Scolmore International Limited Fire resistant back box
GB2454028A (en) * 2007-10-18 2009-04-29 Nvc Fire rated electric light fitting

Also Published As

Publication number Publication date
CN201412785Y (zh) 2010-02-24
GB201000221D0 (en) 2010-02-24
GB2466875B (en) 2013-02-20
GB2466875A (en) 2010-07-14
GB0900420D0 (en) 2009-02-11

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