EP1459008B1 - Couvercles pour accessoires electriques - Google Patents

Couvercles pour accessoires electriques Download PDF

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Publication number
EP1459008B1
EP1459008B1 EP02785640A EP02785640A EP1459008B1 EP 1459008 B1 EP1459008 B1 EP 1459008B1 EP 02785640 A EP02785640 A EP 02785640A EP 02785640 A EP02785640 A EP 02785640A EP 1459008 B1 EP1459008 B1 EP 1459008B1
Authority
EP
European Patent Office
Prior art keywords
cover
fire
fabric
side wall
hood
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
EP02785640A
Other languages
German (de)
English (en)
Other versions
EP1459008A1 (fr
Inventor
Derek Alfred Ward
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.)
Environmental Seals Ltd
Original Assignee
Environmental Seals 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 Environmental Seals Ltd filed Critical Environmental Seals Ltd
Publication of EP1459008A1 publication Critical patent/EP1459008A1/fr
Application granted granted Critical
Publication of EP1459008B1 publication Critical patent/EP1459008B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • This invention relates to covers for electrical fittings and more especially but not exclusively to a cover for a recessed electrical fitting, such as a downlighter set in a plasterboard ceiling, which, in the event of a fire, isolates the fitting from the structure in which it is recessed to maintain the fire resistance thereof.
  • Light fittings recessed into ceilings are well known. Such light fittings are known as down lighters. The heat generated by such light fittings can be considerable and represents a fire hazard. Also the recess in which such a fitting is mounted can itself provide a path for fire and smoke to a room or area located above that ceiling.
  • Our European Patent 805903B discloses a fire-resistant cover for an electrical fitting to be recessed into a supporting structure.
  • the cover comprises a fabric hood coated or impregnated with a liquid based intumescent material and includes an aperture through which a cable can pass.
  • the cover is shaped to include a top supported by one or more upstanding side walls, and comprises an intumescent gasket including a card which overlies a fibrous sheet impregnated with carbon granules secured to the top of the cover.
  • a plurality of ventilation apertures is provided in the cover through one of which electrical wiring can pass to an electrical fitting protected by the cover, and means for connecting the cover to adjoining surfaces of the structure in which the electrical fitting is recessed.
  • An object of this invention is to provide an improved downlighter cover having fire resistance properties which match those achieved by covers in accordance with our earlier patent and which, additionally, exhibit good sound proofing properties.
  • a fire-resistant cover for an electrical fitting to be recessed into a supporting structure, the cover comprising a fabric hood shaped to include a top and one or more upstanding side walls each including a lining of a layer of flexible cellular fire-retardant foam or sponge coated with a primer solution including a sealant and with a flowable coating of fire-retardant material.
  • the lining may be applied to the internal surfaces of the fabric top and side wall(s) of the hood.
  • the lining may be sandwiched between two fabric sheets from which the top and side walls are made.
  • an intumescent gasket comprising a card which overlies a fibrous sheet impregnated with carbon granules is secured to the top or one of the walls of the cover.
  • One or more ventilation apertures may be provided in the cover which also pass through the top or wall(s) of the cover to enable electrical wiring to pass to an electrical fitting protected by the cover.
  • the cover may also include a plurality of fabric pieces secured to the lower margin of the side wall of the cover for attachment to surrounding structure of the ceiling space.
  • the connecting means may comprise at least one fixing strap secured to the interior fo the side wall(s) of the hood and deformable around an edge of the supporting structure to connect the hood to the supporting structure.
  • the fabric preferably is a fibrous cloth.
  • the primer solution may comprise an aqueous solution of an acrylic copolymer which includes ammonium polyphosphate.
  • the fire-retardant coating may comprise a chlorinated vinyl copolymer system which includes a quantity of ammonium polyphosphate, zinc borate and/or magnesium and/or calcium carbonates.
  • the foam or sponge may comprise polyurethane or alternatively a silicone coated with a silane primer.
  • the primer solution may be allowed to dry before the fire-retardant material is applied.
  • One or both coatings may be applied by brushing, rolling or spraying.
  • the cover illustrated in Figures 1 and 2 is produced from superimposed layers of a fibrous woven cloth 1 (e.g. a glass fibre woven cloth) between which are positioned one or more layers of flexible cellular fire-retardant foam or sponge 2.
  • foam or sponge layers therefore provide a lining for the cloth layers of the cover.
  • the thickness of the foam or sponge lining is between 5 and 20mm; preferred thicknesses are between 10 and 15mm.
  • the cover is generally circular in cross-section and comprises an upstanding side wall 3, a top 4 and floor pieces 5 which extend inwardly from the lower margin of the side wall.
  • the foam or sponge lining 2 is positioned between the superimposed fabric sheets of the side wall 3 and the top 4 of the cover.
  • the side wall 3 is produced from lengths of sponge or foam lined glass fibre cloth which are sewn together at their ends, the top 4 then being secured to the upper margin of the side wall 3 again by sewing.
  • the floor pieces 5 are simply sewn to the lower margin of the side wall and are cut to enable the pieces 5 to lie flat on the adjoining surface of the suspended ceiling.
  • the side wall 3 and the top 4 are formed from a single fabric sheet lined internally with a layer of flexible cellular fire-retardant foam or sponge.
  • the outside diameter of the cover is 289mm and the height of the cover is typically 145mm.
  • the top or side wall of the cover has secured to it a circular piece of card 6 which overlies and is bonded to a similarly shaped piece of intumescent material to define an intumescent gasket.
  • This material typically comprises a fibrous sheet impregnated with an intumescent material such as carbon granules.
  • the gasket comprising the card and intumescent piece may simply be secured to the top or side wall of the cover by studs or rivets.
  • the gasket 6 has no holes formed in it for the passage of electrical cabling for the light fitting to be encompassed by the cover.
  • any holes which may be required are produced on site simply by forming one or more holes as required.
  • the gasket is formed with openings 7 through which can pass electrical cabling for the light fitting and ventilation apertures 8.
  • the outside diameter of the gasket is 60mm.
  • the ceiling opening through which the cover must pass when being fitted is relatively small. Because of the flexibility of the fabric material from which the cover and the gasket is formed, the cover can simply be squashed of folded to form a narrow tube which can readily pass through even the smallest ceiling opening for location about the margin of the opening. Before doing so, the electric cabling which carries current to the electrical fitting is passed through an opening formed or already present in the top 4 of the cover. Once sited, the floor pieces 5 of the cover are secured to the upper surface of the ceiling plasterboard using fixing pins 9 such as illustrated in Figure 4. Other simple forms of fixings may be employed. The fixing pins 9 have the advantage that they can be secured in place using finger pressure. Downlighting can then simply be connected to a source of electricity via the appropriate cabling and the opening formed in the plasterboard ceiling closed with a lens cover in the normal way.
  • the fire-retardant lining 2 for the wall and top of the cover comprises sheets of polyurethane foam material of, say, 10mm thickness impregnated with an aqueous solution of a fire-retardant material coated with a solution of an acrylic copolymer system which includes ammonium polyphosphate.
  • an acrylic copolymer system which includes ammonium polyphosphate.
  • the ammonium phosphate forms phosphoric acid which reacts with the fire-retardant coating of the polyurethane liner.
  • This primer coating has a viscosity similar to that of water and acts to seal the open cells of the polyurethane foam. The primer coating therefore seals the exposed surfaces of the polyurethane liner whilst retaining the flexibility characteristics of the liner.
  • the primer coating also provides a bond to which the subsequently applied fire-retardant coating can adhere.
  • the surfaces of the polyurethane liner are then coated with one or more coatings of a chlorinated vinyl copolymer system which includes a quantity of ammonium polyphosphate, zinc borate and/or magnesium and/or calcium carbonates.
  • a chlorinated vinyl copolymer system which includes a quantity of ammonium polyphosphate, zinc borate and/or magnesium and/or calcium carbonates.
  • the viscosity of this fire-retardant coating is more akin to an emulsion or paste.
  • the coatings may be applied by means of a brush, roller or spray.
  • the primer coating not only seals the open pores of the polyurethane block but also, as mentioned previously, provides a primed surface to which the fire-retardant coating can adhere.
  • the coated liner retains its flexibility and the bond between the respective coatings is sufficient to prevent cracking or other damage to the surface during handling of the liner.
  • the heat generated by downlighters recessed into ceilings can represent fire hazards.
  • the intumescent content of the cover liner and the gasket 6 quickly expands to isolate the fitting entirely from the surrounding structure thereby confining the fire and maintaining the fire resistance of the structure.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Building Environments (AREA)
  • Laminated Bodies (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Insulating Bodies (AREA)
  • Dry Shavers And Clippers (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Container Filling Or Packaging Operations (AREA)
  • Casings For Electric Apparatus (AREA)

Claims (10)

  1. Un couvercle ignifuge pour raccord électrique à enfoncer dans une structure de support, le couvercle comprenant un dispositif d'occultation à structure tissée ayant une forme pour comporter un sommet (4) et une ou plusieurs parois latérales orientées vers le haut (3) chacune comportant un revêtement d'une couche (2) d'une mousse ou éponge ignifuge flexible enduite d'une solution de couche primaire comportant un joint et enduite d'un revêtement fluide de matière ignifuge.
  2. Un couvercle revendiqué selon la revendication 1, dans lequel le revêtement (2) est appliqué sur la surface interne du sommet de la structure tissée (4) et des parois latérales (3) de la structure d'obturation.
  3. Un couvercle revendiqué selon la revendication 1, dans lequel le revêtement (2) est pris en sandwich entre deux feuilles tissées (1) à partir desquelles le sommet (4) et les parois latérales (3) sont réalisées.
  4. Un couvercle revendiqué selon l'une quelconque des revendications précédentes, dans lequel un filet intumescent comprenant une carte (6) qui recouvre la feuille fibreuse imprégnée de granules de carbone et fixée au sommet (4) ou une des parois (3) du couvercle.
  5. Un couvercle revendiqué selon la revendication 4, dans lequel le filet comprend une pluralité d'ouvertures de ventilation (8) qui passent également au travers du sommet (4) ou des parois (3) du couvercle et au travers d'une desquelles (7) le câblage électrique est passé vers le raccord électrique protégé par le couvercle.
  6. Un couvercle revendiqué selon l'une quelconque des revendications précédentes, qui comprend également une pluralité de pièces à structure tissée fixées au bord inférieur de la paroi latérale (3) du couvercle pour une fixation pour entourer la structure du vide du plafond.
  7. Un couvercle revendiqué selon la revendication 6, dans lequel les pièces à structure tissée (5) s'étendent à l'intérieur depuis le bord inférieur des parois latérales (3) et dans lequel le dispositif de raccordement coopère avec les pièces à structure tissée pour fixer le couvercle aux surfaces adjacentes de la structure.
  8. Un couvercle revendiqué selon la revendication 7, dans lequel le dispositif de raccordement comprend au moins une bande de fixation fixée à l'intérieur des parois latérales (3) du couvercle et déformable autour d'un bord de la structure de support pour raccorder la structure d'obturation à la structure de support.
  9. Un couvercle revendiqué selon l'une quelconque des revendications précédentes, dans lequel le tissus de la pièce d'obturation est un tissu fibreux.
  10. Un couvercle revendiqué selon l'une quelconque des revendications précédentes, dans lequel la mousse ou l'éponge comprend un polyuréthane ou un silicone enduit d'une couche primaire de silane.
EP02785640A 2001-12-21 2002-12-10 Couvercles pour accessoires electriques Expired - Lifetime EP1459008B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0130869 2001-12-21
GBGB0130869.1A GB0130869D0 (en) 2001-12-21 2001-12-21 Covers for electrical fittings
PCT/GB2002/005598 WO2003056233A1 (fr) 2001-12-21 2002-12-10 Couvercles pour accessoires electriques

Publications (2)

Publication Number Publication Date
EP1459008A1 EP1459008A1 (fr) 2004-09-22
EP1459008B1 true EP1459008B1 (fr) 2006-07-12

Family

ID=9928345

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02785640A Expired - Lifetime EP1459008B1 (fr) 2001-12-21 2002-12-10 Couvercles pour accessoires electriques

Country Status (6)

Country Link
EP (1) EP1459008B1 (fr)
AT (1) ATE333070T1 (fr)
AU (1) AU2002350927A1 (fr)
DE (1) DE60213130D1 (fr)
GB (1) GB0130869D0 (fr)
WO (1) WO2003056233A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2422191B (en) * 2005-01-27 2007-01-10 Rd Europe Ltd Fire-resistant lighting fitting
GB2424693B (en) * 2005-03-29 2009-08-05 Laurence Kovacs Fire hood
BE1016906A3 (nl) * 2005-12-22 2007-09-04 Fleury Albert Brandwerende kap voor het afschermen van een inbouwlamp of dergelijke.
GB202217957D0 (en) * 2022-11-29 2023-01-11 Intumescent Systems Ltd Covers for electrical appliances
GB2625713A (en) * 2022-11-29 2024-07-03 Hoody Speaker Hoods Ltd Covers for electrical appliances

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB593235A (en) * 1945-07-19 1947-10-10 Holophane Co Inc Improvements in and relating to light fittings for ceilings designed for acoustical purposes
NL9001840A (nl) * 1990-08-17 1992-03-16 Rockwool Lapinus Bv Geluiddempende kap en werkwijze voor het vervaardigen daarvan.
DE4423281A1 (de) * 1994-07-05 1996-01-11 Schmitt Juergen Unterdecke
GB9501391D0 (en) * 1995-01-25 1995-03-15 Environmental Seals Ltd Ventilated covers for electrical fittings
GB2348603B (en) * 1999-03-23 2002-02-13 Uri Friedlander Fire barrier for electrical fittings

Also Published As

Publication number Publication date
DE60213130D1 (de) 2006-08-24
EP1459008A1 (fr) 2004-09-22
WO2003056233A1 (fr) 2003-07-10
ATE333070T1 (de) 2006-08-15
GB0130869D0 (en) 2002-02-06
AU2002350927A1 (en) 2003-07-15

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