GB2499722A - Fire resistant light fitting - Google Patents

Fire resistant light fitting Download PDF

Info

Publication number
GB2499722A
GB2499722A GB1302721.4A GB201302721A GB2499722A GB 2499722 A GB2499722 A GB 2499722A GB 201302721 A GB201302721 A GB 201302721A GB 2499722 A GB2499722 A GB 2499722A
Authority
GB
United Kingdom
Prior art keywords
fire resistant
light fitting
fitting according
lighting element
resistant body
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.)
Granted
Application number
GB1302721.4A
Other versions
GB201302721D0 (en
GB2499722B (en
Inventor
Daniel Hiscoke
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 GB201302721D0 publication Critical patent/GB201302721D0/en
Publication of GB2499722A publication Critical patent/GB2499722A/en
Application granted granted Critical
Publication of GB2499722B publication Critical patent/GB2499722B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/007Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages with provision for shipment or storage
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00Lighting devices intended for fixed installation
    • F21S8/02Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V21/00Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/02Wall, ceiling, or floor bases; Fixing pendants or arms to the bases
    • F21V21/04Recessed bases
    • F21V21/041Mounting arrangements specially adapted for false ceiling panels or partition walls made of plates
    • F21V21/042Mounting arrangements specially adapted for false ceiling panels or partition walls made of plates using clamping means, e.g. for clamping with panel or wall
    • F21V21/044Mounting arrangements specially adapted for false ceiling panels or partition walls made of plates using clamping means, e.g. for clamping with panel or wall with elastically deformable elements, e.g. spring tongues
    • F21V21/046Mounting arrangements specially adapted for false ceiling panels or partition walls made of plates using clamping means, e.g. for clamping with panel or wall with elastically deformable elements, e.g. spring tongues being tensioned by rotation of parts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00Arrangement of electric circuit elements in or on lighting devices
    • F21V23/02Arrangement of electric circuit elements in or on lighting devices the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00Arrangement of electric circuit elements in or on lighting devices
    • F21V23/02Arrangement of electric circuit elements in or on lighting devices the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
    • F21V23/026Fastening of transformers or ballasts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00Safety devices structurally associated with lighting devices
    • F21V25/12Flameproof or explosion-proof arrangements
    • F21V25/125Flameproof or explosion-proof arrangements using intumescent material, i.e. using materials which swells up as a result of heat exposure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00Lighting devices intended for fixed installation
    • F21S8/02Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • F21S8/026Lighting 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

Abstract

A fire resistant light fitting 10 for mounting in an aperture in a fire resistant panel comprises a fire resistant body 11, a support frame 17 secured to the body and having secured thereto a heat sink 21, and a LED array 22 secured to the heat sink in thermal contact therewith. The fire resistant body 11 has apertures 23 aligned with the LEDs to allow light to travel outwards. The fire resistant body 11 provides support for a layer of intumescent material 25 which is positioned between the fire resistant body 11 and lighting element 22.

Description

1
LIGHT FITTING
This invention relates to a light fitting and in particular, though not exclusively, to a heat/fire resistant light fitting, such as a light fitting of a solid state type in which light emitting diodes are employed as the source of illumination.
Building regulations often require that down lighters which are fitted into ceilings shall be provided with fire hoods to inhibit the spread of fire. Although many types of fire hood have been proposed and generally have performed successfully, there is a continuing aim to increase the efficiency of the built-in ventilation and fire/heat protection.
An object of the present invention is to provide a fire resistant light fitting in which disadvantages of hitherto known light fittings are mitigated or overcome.
In accordance with one aspect of the present invention there is provided a fire resistant light fitting suitable for mounting in an aperture in a fire resistant panel, said light fitting comprising a fire resistant body;
a support frame secured to the body and having secured thereto at least a heat sink, and a lighting element secured to the heat sink in thermal contact therewith, wherein the fire resistant body comprises at least one aperture aligned with a lighting element whereby light may travel from the lighting element outwards through said aperture, and said fire resistant body providing support for a layer of intumescent material which is positioned between the fire resistant body and lighting element.
Preferably the layer of intumescent material closely surrounds the or each aperture in the fire resistant body. Preferably the intumescent material is fire resistant.
2
Preferably the intumescent layer is spaced from the lighting element thereby to provide a ventilation space and facilitate heat dissipation. Thus it will be understood that said spacing will at least in part compensate for the effect of the thermal insulation properties of the intumescent layer the presence of which, in the case of a lighting element in direct contact with the intumescent layer, would restrict the conduction of heat from the lighting element to the fire resistant body as compared with a construction in which the lighting element is in direct contact with a metallic fire resistant body.
However the invention does not exclude the provision of intumescent layer in a position sandwiched between and in contact with each of the fire resistant body and lighting element.
It is further preferred that the fire resistant body is not in direct thermal contact with the lighting element and/or heat sink.
Preferably the lighting element is secured to a heat sink which is in turn secured, at a first end region remote from the lighting element, to the support frame. The support frame may have a second end region which is remote from the first end region and said second end region may be secured to the fire resistant housing.
The support frame preferably is of an open construction whereby it does not inhibit air flow for convection cooling of the heat sink.
Said support frame may be employed in a conventional manner for providing support and location for fixing means such as springs and clasps for assisting in retention of the light fitting in a fire resistant panel, and for support of a transformer, for example a transformer in the form of a so-called driver for use with a light emitting diode.
Preferably the fire resistant body is constructed from a material, such as pressed steel, that can withstand temperatures of up to 900°C, and more preferably up to 1000°C.
3
Preferably the intumescent material is spaced from the lighting element but said spacing and the properties of the intumescent material are selected such that in the event of fire the intumescent material will expand sufficiently to substantially fully occupy the space originally present between that material and the lighting element.
Additionally fire resistant intumescent material may be positioned around the fire resistant body, in use to lie between the fire resistant body and a panel or the like to which the light fitting is secured.
One suitable fire resistant intumescent material is a graphite based material such as that supplied by Technical Fibre Products Limited under the name "Intumescent Material" and which consists of a high temperature Rockwool fibre mat containing easily dispersed foliating graphite bonded in acrylic.
One embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings in which:-
Figure 1 is a part sectional view of a fire resistant light fitting, and
Figure 2 shows in perspective a lower part of the light fitting of Figure 1 and from which the support frame and items secured to the support frame have been omitted.
The fire resistant light fitting 10 comprises a fire resistant body 11 which,
when the light fitting is in situ in a fire resistant panel extends substantially wholly over the aperture provided in the fire resistant panel for location of the light fitting.
As viewed in transverse cross-section in a plain perpendicular to the view of Figure 1, and as depicted in Figure 2, the light fitting is of the conventional circular shape.
4
The fire resistant body 11 defines an outer flange formation 12 which provides support for a moisture seal 13 which in use lies between the flange and fire resistant panel (not shown) to which the light fitting is secured. That flange also provides support for a decorative facia 14.
In Figure 2 a part of the moisture seal is shown upturned to reveal the flange formation 12 and facia 14.
Radially inwards from the flange 12 the fire resistant body comprises a substantially annular rib formation 15 the upper surface 16 of which provides support and location for a support frame 17.
The support frame 17 in turn provides support and location for a pair of spring loaded clips 18 which, in use, bear against a rear face of the fire resistant panel and thereby hold the moisture seal 13 in firm contact with the front face of the panel.
The frame 18 additionally provides support for a transformer 19 and also supports the upper end 20 of a heat sink 21. The other end of the heat sink has secured thereto, in thermal contact therewith a lighting element in the form of an LED array 22 comprising three LEDs. The array 22 is secured to the heat sink by a screw 35.
At an end 27 of the frame, opposite the end 26 which supports the transformer 19 and heat sink 21, the frame is secured to the fire resistant body by means of screws 34 which engage in screw threaded apertures in the upper face 16 of the annular rib 15.
Inwards of the annular rib 15 the fire resistant body is of a generally circular form and comprises three apertures 23 which are each aligned with and spaced from a respective one of three LEDs of the array 22.
The inner face of the fire resistant body, being the face opposite the LED array 22, provides support for a layer of intumescent material 25 which is
5
formed with three small apertures each aligned with a respective one of the three apertures 23 in the fire resistant body 11. A lens 28 extends over the outwardly facing surface of a central part of the fire resistant body.
Individual LEDs extend downwards through the apertures 23 of the intumescent layer and the fire resistant body to align in known manner with conventional formations in the lens 28. Although the individual LEDs extend downwards through the apertures in the intumescent layer and the fire resistant body the remainder of the LED array formation is slightly spaced from the intumescent material and is secured to and in thermal contact with the heat sink
In the event of a fire the associated heat causes expansion of the intumescent layer 25 such that it then fully occupies the space 29 that originally was present between that layer and the LED array 22.
Although not essential, optionally an intumescent band 30 may be provided around the annular rib 15 of the fire resistant body and be expandable in response to heat from a fire to assist in achieving and enhancing a seal between the fire resistant body and a fire resistant panel
6

Claims (19)

Claims
1. A fire resistant light fitting suitable for mounting in an aperture in a fire resistant panel, said light fitting comprising a fire resistant body;
a support frame secure to the body and having secured thereto at least a heat sink, and a lighting element secured to the heat sink in thermal contact therewith, wherein the fire resistant body comprises at least one aperture aligned with a lighting element whereby light may travel from the lighting element outwards through said aperture, and said fire resistant body providing support for a layer of intumescent material which is positioned between the fire resistant body and lighting element.
2. A light fitting according to claim 1 wherein the intumescent layer is spaced from the lighting element.
3. A light fitting according to claim 2 wherein in the event of fire the intumescent material will expand to substantially fully occupy the space originally present between the intumescent material and the lighting element.
4. A light fitting according to claim 1 wherein the intumescent layer is sandwiched between and in contact with each of the fire resistant body and the lighting element.
5. A light fitting according to any one of the preceding claims wherein the fire resistant body is not in direct thermal contact with the lighting element.
6. A light fitting according to claim 5 wherein the lighting element is secured to a heat sink and said heat sink is secured to the support frame at a position remote from the lighting element.
7
7. A light fitting according to claim 6 wherein an end of the support frame remote from the end to which the heat sink is secured thereto is secured to the fire resistant body.
8. A light fitting according to any one of the preceding claims wherein the fire resistant body is able to withstand temperatures of up to 900°c.
9. A light fitting according to claim 8 wherein the fire resistant body is able to withstand temperatures of up to 1000°c.
10. A light fitting according to any one of the preceding claims wherein the fire resistant body comprises a substantially annual rib formation between a central region of the body and an outwardly extending flange.
11. A light fitting according to claim 10 wherein said rib formation provides a mounting position for the support frame.
12. A light fitting according claim 10 or claim 11 wherein the layer of intumescent material substantially wholly occupies said central region of the fire resistant body.
13. A light fitting according to any one of the preceding claims wherein the layer of intumescent material closely surrounds the or each aperture in the fire resistant body.
14. A light fitting according to any one of the preceding claims wherein the fire resistant body comprises at least three apertures each for transmission of light outwards from the lighting element.
15. A light fitting according to any one of the preceding claims wherein the lighting element comprises an LED which extends at least in part through an aperture in the fire resistant body.
8
16. A light fitting according to any one of the preceding claims intumescent material extends around the fire resistant body.
17. A light fitting according to claim 16 wherein the fire resistant body comprises a substantially annular rib formation and a radially outwardly facing surface of said rib formation provides support for fire resistant intumescent material.
18. A light fitting according to any one of the preceding claims and comprising intumescent material which is fire resistant.
19. A lighting element according to claim 1 and substantially as hereinbefore described.
GB1302721.4A 2012-02-23 2013-02-15 Light fitting Active GB2499722B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB1203260.3A GB201203260D0 (en) 2012-02-23 2012-02-23 Lighting accessories

Publications (3)

Publication Number Publication Date
GB201302721D0 GB201302721D0 (en) 2013-04-03
GB2499722A true GB2499722A (en) 2013-08-28
GB2499722B GB2499722B (en) 2014-06-04

Family

ID=45991709

Family Applications (3)

Application Number Title Priority Date Filing Date
GBGB1203260.3A Ceased GB201203260D0 (en) 2012-02-23 2012-02-23 Lighting accessories
GB1302721.4A Active GB2499722B (en) 2012-02-23 2013-02-15 Light fitting
GB1302715.6A Active GB2499721B (en) 2012-02-23 2013-02-15 Lighting accessory

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB1203260.3A Ceased GB201203260D0 (en) 2012-02-23 2012-02-23 Lighting accessories

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB1302715.6A Active GB2499721B (en) 2012-02-23 2013-02-15 Lighting accessory

Country Status (3)

Country Link
CN (1) CN203273777U (en)
GB (3) GB201203260D0 (en)
WO (1) WO2013124609A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2510717A (en) * 2013-02-11 2014-08-13 Scolmore Int Ltd Heat resistant casing
CN105765302A (en) * 2013-09-23 2016-07-13 奥罗拉有限公司 A lighting device and improvements thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110578913B (en) * 2018-06-11 2021-10-12 卡任特照明解决方案有限公司 Mounting assembly, lighting system and method for fixing mounting strip

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005124225A1 (en) * 2004-06-18 2005-12-29 Scolmore International Limited Heat resistant casing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6402350B1 (en) * 1999-10-21 2002-06-11 Lucifer Lighting Company Lighting fixture and method for use in non-accessible locations
JP2003249115A (en) * 2002-02-25 2003-09-05 Matsushita Electric Works Ltd Downlight
EP2223013A1 (en) * 2007-12-21 2010-09-01 Daxtor APS Mounting device for mounting electric components
EP2180241B1 (en) * 2008-10-22 2012-08-29 Toshiba Lighting & Technology Corporation Lighting Apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005124225A1 (en) * 2004-06-18 2005-12-29 Scolmore International Limited Heat resistant casing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2510717A (en) * 2013-02-11 2014-08-13 Scolmore Int Ltd Heat resistant casing
GB2510717B (en) * 2013-02-11 2014-12-24 Scolmore Int Ltd Heat resistant casing
CN105765302A (en) * 2013-09-23 2016-07-13 奥罗拉有限公司 A lighting device and improvements thereof
CN105765302B (en) * 2013-09-23 2020-11-17 奥罗拉有限公司 Improvements in and relating to lighting apparatus

Also Published As

Publication number Publication date
GB201302721D0 (en) 2013-04-03
CN203273777U (en) 2013-11-06
GB2499721A (en) 2013-08-28
GB2499722B (en) 2014-06-04
GB2499721B (en) 2014-09-17
WO2013124609A1 (en) 2013-08-29
GB201302715D0 (en) 2013-04-03
GB201203260D0 (en) 2012-04-11

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