GB2571974A

GB2571974A - Light fitting

Info

Publication number: GB2571974A
Application number: GB1804130.1A
Authority: GB
Inventors: Hiscoke Daniel
Original assignee: Scolmore International Ltd
Current assignee: Scolmore International Ltd
Priority date: 2018-03-15
Filing date: 2018-03-15
Publication date: 2019-09-18
Anticipated expiration: 2038-03-15
Also published as: GB2571974B; GB201804130D0; CN209540680U

Abstract

A light fitting 10 for installing in a partition panel comprises a light emitting component, a power source for supply of electrical power to the light emitting component, and two chassis sections 20 to support each of the power source and light emitting component. Each chassis section comprises a one piece metallic pressing which provides a mounting platform 21 relative to which each of the light emitting component and power source are secured. Each chassis section has two location formations 24, 25 integral with the mounting platform. One location formation 25 defines a flange 26 which in use abuts one side of a partition panel. The other location formation 24 defines a support 29 for a retention arm 34 which in use bears against the other side of the partition panel.

Description

LIGHT FITTING

This invention relates to a light fitting, known also as a luminaire, and in particular but not exclusively to a light fitting of the so-called fire resistant type, being of the type resistant to heat and/or fire, and suitable for installing in a partition panel such as that of a ceiling or wall.

The invention further relates in particular, but not exclusively, to a light fitting comprising a solid-state lighting device such as an LED type lighting device.

Typically the light fitting will be installed within an aperture in a ceiling or other partition panel and for a fire resistant type of light fitting it is important that in the event of a fire at least a sufficient part of the light fitting remains in situ to inhibit the spread of flames or hot gases through the partition for an acceptable period of time.

Various constructions have been proposed for a fire resistant type light fitting, including those of the type comprising a solid-state lighting device, but either the fire resistant properties are less than entirely satisfactory or the cost of the light fitting is undesirably greater than that of a light fitting that is not fire resistant. Thus typically the known constructions have required provision of a supporting body in the form of a deep drawn can or of an assembly of components that are secured together by welding, screws or rivets. Constructions of such types are expensive to produce.

The present invention seeks to provide a light fitting, for example afire resistant light fitting, which is suitable for installing in a partition panel and which is economical to produce.

The invention seeks also to provide a chassis for supporting a light emitting component and a power source of a light fitting.

In accordance with one aspect of the present invention a light fitting for installing in a partition panel comprises a light emitting component, a power source for supply of electrical power to the light emitting component and at least one chassis section to support each of said power source and light emitting component, said chassis section comprising a one piece metallic pressing and said pressing providing a mounting platform relative to which each of the light emitting component and power source are secured, the chassis section further comprising two location formations each integral with the mounting platform, one location formation defining a flange which is positioned in use to abut one side of a partition panel and the other location formation defining a support for a retention arm which, in use, bears against the other side of the partition panel.

The term “power source” is used herein to relate to a component that delivers electrical power to a light source but typically does not necessarily generate electricity. Thus the power source may be a battery but more typically will be a connector or driver for a light source, utilising an external supply of electricity. The power source may comprise a light source, such as an LED light source, operable to direct light to the light emitting component.

The light fitting may comprise at least one retention arm and said retention arm may be of a spring loaded type, for example of a type known per se.

The light fitting may be provided with a single said chassis section or a plurality of chassis sections. It may comprise two chassis sections.

If the light fitting comprises a single chassis section, said chassis section preferably provides two location formations for support of a pair of retention arms.

A single said chassis section may comprise two or more flanges or a single flange which may be in the form of a peripherally continuous, annular flange which may bear against a side of a partition panel.

If the flange is not peripherally continuous, preferably two flanges are provided and each aligned at least in part with the position of a location formation that, in use, supports a retention arm when considered in a direction perpendicular to the plane of the partition panel.

As an alternative to a single said chassis section, the light fitting may comprise two chassis sections which each may comprise a single flange and a single location formation for a retention arm. The two chassis sections of the pair may be provided with formations which enable the two sections each to engage with a complementary formation of the light emitting component and or the power source, or inter engage with one another. The two chassis sections of a pair may be identical in shape.

The light fitting may comprise a chassis section having a mounting section in the form of a platform which may be substantially planar. A planar mounting section platform may be arranged in use to lie in a plane substantially parallel with that of a planar partition panel.

The chassis section or plurality of chassis sections may define at least in part a cavity region for locating the light emitting component. A rear face of the mounting platform, opposite that side of the mounting platform that in part defines the cavity region, preferably has secured relative thereto the power source, such as that of an LED unit.

The mounting platform preferably is provided with or in part defines an aperture through which extends a part of one of the light emitting component and power source whereby said light emitting component and power source are in operative communication but reside substantially at opposite sides of the mounting platform.

A light emitting component may be supported relative to the chassis section(s) by being attached to the power source which in turn is secured to the chassis section(s). Alternatively the light emitting component may be supported within the cavity region by being directly secured to the mounting platform, or other part of the chassis section such as a wall section extending between the mounting platform and the flange of a location formation. In a further alternative the light emitting component and power source may be secured to one another with the mounting platform sandwiched therebetween. Each of the light emitting components and power source may be secured directly to the chassis section, preferably directly to the mounting platform.

The light emitting component may comprise a light source, or a light source, such as an LED light source, may be a part of the power source. In the latter case the light emitting component may be in the form of an optics unit such as one comprising a lens or transparent lens or cover from which light from a light source may be emitted.

Optionally a chassis section, or pair of chassis sections, may define a substantially part cylindrically or substantially part frusto conically shaped wall section that defines an outer boundary of the aforementioned cavity region. The chassis section(s) may comprise a peripherally discontinuous wall section that extends between the mounting platform and the flange thereby to space the flange from the mounting platform. The wall section may be defined by a part of the location formation that defines the flange.

For a light fitting of a fire resistant type intumescent material, such as an intumescent graphite seal may be provided in or around the cavity region, either to lie within a wall section, or external of a wall section.

In accordance with another aspect of the present invention a chassis for supporting a light emitting component and power source of a light fitting comprises a one piece metallic pressing shaped to provide a central mounting platform adapted for support of the light emitting component and power source and two location formations which extend in opposite directions from the mounting platform, one, a first of the location formations comprising a flange and a wall section which extends between the flange and mounting platform, said flange lying inclined relative to the length of the wall section, and the other, a second of the location formations comprising a retention section and a spacer section which extends between the retention section and the mounting platform, said retention section having a profile for interlocking with a retention arm of a light fitting.

The two said location formations preferably extend from opposite positions of the mounting platform. Said location formations may extend in directions which are substantially parallel. One or each of said location formations may extend in a direction substantially perpendicular to the mounting platform in the case of a mounting platform that is planar.

The mounting platform may comprise a positioning formation such as an aperture or an upstanding region in use for interengaging with a complementary formation defined by one of a light emitting component and a power source. The positioning formation may be employed, in use, to resist sliding of the light emitting component and power source relative to the mounting platform in at least one direction.

The mounting platform may comprise two or more of said first location formations. Additionally or alternatively it may comprise two or more of said second location formations.

The mounting platform may define a central aperture through which the light emitting component and power source may be operatively interconnected. Alternatively, in the case of a chassis which is one of a pair of chassis sections that are employed together to support the light emitting component and power source, the mounting platform of each chassis section may define a part of said aperture, typically one half of the aperture if two identical chassis sections a re employed.

The retention section of said second location formation may comprise a pair of spaced apart limbs that extend towards one another in use to support respective ends of a torsion spring provided to spring load a retention arm.

For provision of a light fitting of a compact constructions the spacing of the retention section from the mounting platform preferably is less than the length (from the mounting platform) of the first location comprising the flange and wall section.

A chassis for use as a chassis section of a light fitting in accordance with the present invention may be a metallic pressing of steel, an alloy or other metallic material such as aluminium or brass. For use as part of a fire resistant type of light fitting the metallic pressing preferably is formed from a material such as steel or an alloy having a melting point greater than 700 degrees centigrade.

The chassis may comprise an aperture through which, in use, a retainer such as a screw may extend to secure together a light emitting component and a power source to lie at opposite faces of the mounting platform.

An 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 cross-sectional view of a light fitting in accordance with the present invention in situ secured to a partition panel;

Figure 2 is an exploded perspective view of the light fitting of Figure 1;

Figure 3 is a perspective view of the blank from which a part of the light fitting is formed;

Figure 4 is an exploded perspective view of part of the light fitting of Figure 1, as viewed in a direction substantially opposite to that of Figure 2;

Figure 5 is a sectional view corresponding to that of Figure 1 with the light emitting component separated from the remainder of the light fitting, and

Figure 6 corresponds to part of Figure 5 and shows the heat transmission paths.

A light fitting 10 of a fire resistant type is shown in Figure 1 when secured to an aperture 12 provided in a partition member which is in the form of a horizontally disposed ceiling plasterboard 11.

The light fitting comprises an LED optical unit 13 having at one end 14 a lens from which light is emitted. The other end 16 of the optical unit lies adjacent an LED light source 17 associated with a driver unit 18 whereby light from the LED 17 is directed to the lens 14.

The light fitting is secured to the ceiling board 11 by means of two identically shaped chassis sections 20 and each is formed from a single piece of pressed sheet steel.

Each chassis section 20 (see Figure 3) comprises a substantially planar mounting platform 21 having opposite end regions 22, 23 from which extend two location formations 24, 25.

A first 24 of the location formations comprises a flange 26 and a wall section 27 which extends between the flange and mounting platform.

A second 25 of the location formations comprises a retention section 29 and a spacer section 30 that extends between the retention section and mounting platform.

As best seen in Figure 4, the two location formations 24, 25 extend in opposite directions from the mounting platform, and the wall section 27 and spacer section 30 of the two location formations extend substantially parallel with one another.

The flange 26 extends at right angles to the wall section 37, outwards from a cavity space 31 defined in part by the pair of wall sections 27 of the two chassis sections 20 and the lower face 32 (see Figure 6) of the mounting platform. In use the flange 26 bears against an outer face 37 of the ceiling board 11.

The retention section 29 comprises a pair of spaced apart limbs 33 (see Figure 3) that extend towards one another and provide support for two ends of a torsion spring 35 that, in use in a conventional manner, biases one of a pair of retention arms 34 against a first face 36 of the ceiling board 11.

When the two chassis sections are positioned side by side in the manner shown in Figure 4 it will be seen that the first formation 24 of one chassis section and the second formation 25 of the other chassis section are substantially aligned as considered in the plane of the mounting platform. Additionally (see Figure 3) the retention section 29 of the second location formation 25 extends sideways from the associated spacer section 25, in a direction opposite that in which the curved outer edge 40 of the platform extends from the spacer section. In consequence in the assembly as shown in Figure 4 the retention arm will bear against the ceiling board at a position aligned with the flange 26 of the other chassis, thereby resulting in a uniform, aligned loading of the plasterboard material sandwiched therebetween.

The mounting platform of each chassis section is provided with an aperture 42 by means of which one of a pair of screws 49 may extend through the power source 18 to engage with the optical unit and thereby secure them together with the mounting platforms firmly sandwiched therebetween. Additionally the power source and optical unit 13 are secured together by means of a pair of screws 50 that engage with apertures in the power source.

Each chassis section 20 is formed with a pair of positioning formations each in the form of an upstanding lug 44 (see Figures 3 and 4) which engages with a respective complementary recess in the power source 18, in the plane of the mounting platform.

The mounting platform of each chassis section has a semi-circular radially inner edge 45 which in part defines a central aperture 46 of the assembly of two chassis sections 21. The central aperture permits the optical unit 13 to extend through the mounting section and abut the LED 17 of the power source driver unit 18. The optical unit additionally provides location for a conventional bezel 47.

Within the cavity 31 the light unit is provided with a cylindrically shaped intumescent foam band 48. However in an alternative embodiment a light fitting that is not required to be fire resistant may be constructed substantially as described with reference to he accompanying drawings but omitting the intumescent foam band.

Although the invention has been described with reference to the drawings in relation to a light fitting having two chassis sections, it is to be understood that alternatively a single chassis may be employed and may have a shape corresponding to that of the aforedescribed pair of chassis sections 20.

It will be realised from the foregoing that the present invention advantageously provides a low cost chassis for supporting other components of a light fitting relative to a partition panel, and that it achieves that in a manner that permits installation and use in accordance with conventional practices.

Claims

1. A light fitting for installing in a partition panel, said light fitting comprising a light emitting component, a power source for supply of electrical power to the light emitting component and at least one chassis section to support each of said power source and light emitting component, said chassis section comprising a one piece metallic pressing and said pressing providing a mounting platform relative to which each of the light emitting component and power source are secured, the chassis section further comprising two location formations each integral with the mounting platform, one location formation defining a flange which is positioned in use to abut one side of a partition panel and the other location formation defining a support for a retention arm which, in use, bears against the other side of the partition panel.

2. A light fitting according to claim 1 wherein the mounting platform defines at least in part an aperture through which extends a part of one of the light emitting component and power source whereby said light emitting component and power source are in operative communication but reside substantially at opposite sides of the mounting platform.

3. A light fitting according to claim 1 or claim 2 wherein the light emitting component is supported relative to the chassis section by being attached to the power source which is secured to the chassis section.

4. A light fitting according to claim 1 or claim 2 wherein the light emitting component is supported relative to the chassis section by being secured directly to the chassis section

5. A light fitting according to claim 1 or claim 2 wherein at least one of the light emitting component and power source are each secured directly to the mounting platform of the chassis section.

6. A light fitting according to claim 1 or claim 2 wherein the light emitting component and power source are secured to one another thereby to sandwich the mounting platform therebetween.

7. A light fitting according to any one of the preceding claims wherein the mounting section is a substantially planar platform.

8. A light fitting according to claim 7 wherein the planar mounting section platform is positioned within the light fitting in use to lie in a plane substantially parallel with that of a planar partition panel.

9. A light fitting according to any one of the preceding claims wherein the chassis section defines at least in part a cavity region for locating the light emitting component.

10. A light fitting according to claim 9 wherein the mounting platform comprises a rear face, opposite that side of the mounting platform that at least in part defines said cavity region, and has secured relative thereto the power source.

11. A light fitting according to claim 9 or claim 10 wherein the chassis section defines a substantially part cylindrically or part frusto conically shaped wall section which defines an outer boundary of said cavity section.

12. A light fitting according to claim 11 wherein the chassis section comprises a peripherally discontinuous wall section that extends between mounting platform and flange thereby to space the flange from the mounting platform.

13. A light fitting according to claim 11 or claim 12 wherein the wall section is defined by a part of that location formation which defines the flange.

14. A light fitting according to any one of claims 9 to 13 wherein intumescent material is provided in or around the cavity region.

15. A light fitting according to any one of the preceding claims wherein the light emitting component comprises a light source.

16. A light fitting according to any one of claims 1 to 15 wherein the power source comprises a light source.

17. A light fitting according to claim 15 or claim 16 wherein the light emitting component comprise an optics unit comprising a lens from which light from a light source may be emitted.

18. A light fitting according to any one of the preceding claims and comprising a single chassis section.

19. A light fitting according to claim 18 wherein said single chassis section provides two location formations for support of a pair of retention arms.

20. A light fitting according to claim 18 or claim 19 wherein said single chassis section comprises at least two flanges.

21. A light fitting according to any one of claims 18 to claim 20 wherein the single chassis section comprises a peripherally continuous annular flange in use for bearing against the side of a partition panel.

22. A light fitting according to any one of claims 18 to 21 wherein the chassis section comprises two flanges each aligned at least in part with the position of a location formation that, in use, supports a retention arm as considered in a direction perpendicular to the plane of the partition pane.

23. A light fitting according to any one of claims 1 to 17 and comprising two chassis sections.

24. A light fitting according to 23 wherein each chassis section comprises a single flange and a single location formation for a retention arm.

25. A light fitting according to claim 23 or claim 24 wherein the two chassis sections are provided with formations which enable the two sections each to engage with a complementary formation of at least one of the light emitting component and power source or to inter-engage with one another.

26. A light fitting according to any one of claims 23 to 25 wherein the two chassis sections are identical in shape.

27. A chassis for supporting the light emitting component and power source of a light fitting, said chassis comprising a one piece metallic pressing shaped to provide a central mounting platform adapted for support of the light emitting component and power source and two location formations which extend in opposite directions from the mounting platform, one, a first of the location formations comprising a flange and a wall section which extends between the flange and mounting platform, said flange lying inclined relative to the length of the wall section, and the other, a second of the location formations comprising a retention section and a spacer section which extends between the retention section and the mounting platform, said retention section having a profile for interlocking with a retention arm of a light fitting.

28. A chassis according to claim 27 and comprising two location formations which extend from opposite positions of the mounting platform.

29. A chassis according to claim 28 wherein the mounting platform is planar and at least one of the location formations extends in a direction substantially perpendicular to the plane of the mounting platform.

30. A chassis according to any one of claims 27 to 29 wherein the mounting platform comprises a positioning formation in use for inter-engaging with a complementary formation defined by at least one of a light emitting component and a power source.

31. A chassis according to claim 30 wherein the positioning formation is adapted to resist sliding of the light emitting component and power source relative to the mounting platform in at least one direction.

32. A chassis according to any one of claims 27 to 31 wherein the mounting platform comprises at least two said first location formations.

33. A chassis according to any one of claims 27 to 32 wherein the mounting platform comprises at least two said second location formations.

34. A chassis according to any one of claims 27 to 33 wherein the mounting platform defines a central aperture through which the light emitting component and power source of a light fitting may be operatively interconnected.

35. A chassis according to any one of claims 27 to 33 wherein the chassis is one of a pair of chassis sections employed together to support the light emitting component and power source of the light fitting, the mounting platform of each chassis section defining part of an aperture which facilitates operative interconnection of a light emitting component and a power source.

36. A chassis according to any one of claims 27 to 35 wherein the retention section of the second location formation comprises a pair of spaced apart limbs that extend towards one another in use to support respective ends of a torsion spring which spring loads a retention arm.

37. A light fitting according to any one of claims 1 to 26 or a chassis according to any one of claims 27 to 36 wherein the first formation extends from the mounting platform by a distance less than the spacing of the retention section of the second formation from the mounting platform.