CN112204304A

CN112204304A - Light fitting for attaching a ceiling lamp to a ceiling

Info

Publication number: CN112204304A
Application number: CN201980036558.6A
Authority: CN
Inventors: 西娅·斯文松
Original assignee: Ikea Supply AG
Current assignee: Ikea Supply AG
Priority date: 2018-06-01
Filing date: 2019-05-29
Publication date: 2021-01-08
Also published as: EP3803202A1; WO2019231388A1; EP3803202A4; SE1850666A1; SE543904C2

Abstract

A light fitting (10, 20) for attaching a pendant light (30, 40) to a ceiling, the light fitting (10) comprising a first member (11, 21) attachable to a ceiling and a second member (12, 22) having a first end (121, 221) connected to the first member (11, 21) and a second end (122, 222) connected directly or indirectly to a pendant light (30, 40).

Description

Light fitting for attaching a ceiling lamp to a ceiling

Technical Field

The present invention relates to the field of light fittings and generally to lamps. More particularly, the present invention relates to a light fitting for attaching a lamp to a ceiling, a lamp comprising such a light fitting and a method for attaching a light fitting to a ceiling.

Background

Light fittings are well known products, for example for attaching lamps to ceilings. They typically include electrical connections and some means for supporting the weight of the lamp, in some cases electrical wires and in some cases separate wires or the like. Since the light fittings are usually mounted to the ceiling in a visible manner, they are preferably designed to be aesthetically pleasing and therefore they may comprise a cover or ceiling rose covering the internal components of the light fitting.

A light fitting configured to attach a light to a ceiling may be configured to attach to a ceiling in a variety of ways. Commonly used methods include screws and hooks pre-mounted to the ceiling, to name a few. A common problem is that it is difficult to achieve the desired suspension height of the lamp when mounting the pendant lamp, as this typically requires that the person suspending the lamp must tediously adjust the length of the cord/wire attaching the lamp to the light fitting. Access to the internal components of the light fitting, such as the electrical connectors and/or the means for suspending the light fitting, may also be limited.

In view of the above, it is therefore desirable to provide a light fitting and a lamp comprising such a light fitting that alleviate some of the problems of the prior art solutions.

Disclosure of Invention

It is therefore an object of the present invention to at least partially overcome one or more of the above limitations of the prior art. In particular, it is an object of the invention to provide a light fitting for attaching a ceiling lamp to a ceiling, a lamp comprising such a light fitting and a method for mounting a light fitting to a ceiling.

In a first aspect, a light fitting for attaching a ceiling lamp to a ceiling is provided. The light fitting includes a first member attachable to a ceiling, and a second member. The first end of the second member is connected to the first member and the second end is directly or indirectly connected to the lamp such that the second end protrudes outside or from the first member in a direction towards the pendant lamp. The length of the portion of the second member projecting outside the first member is adjustable. In some embodiments, the suspension height of the lamp can thus be conveniently adjusted by changing the length of the protrusion of the second member. In other embodiments, adjustment of the length of the portion of the second member protruding outside the first member allows for easy access when mounting the lamp.

In one embodiment, the light fitting further comprises a housing member configured to at least partially cover the first member. The housing member includes a first aperture through which the second member extends. The adjustable length of the projection of the second member facilitates installation of the housing member and simplifies access to the portion of the light fitting configured to be covered by the housing member.

The first bore of the housing member may be configured to be generally axially aligned with the first member.

The first member may include threads, and the light fitting further includes a nut through which the second member extends and which is configured to engage the threads of the first member.

In one embodiment, the nut is axially movable relative to the second member and rotatable relative to the light fitting. The nut may include a flange configured to vertically support the housing member. Since the second member is movable relative to the nut and the housing member that the nut supports, access during installation may be improved even when the housing member is installed to the light fitting.

In one embodiment, the second member is a wire.

Furthermore, the first member may be provided with a lock member configured to allow unrestricted movement of the wire in a direction towards the first member, and to restrict or even prevent movement of the wire in a direction away from the first member. Thus, a safe adjustability of the length of the wire projection is provided. Since the lock member has to be actively released, e.g. by pressing the lock release member, to extend the wire, undesired extension of the wire is avoided.

In one embodiment, the lock member is arranged concentrically around the wire.

In one embodiment, the second member is an elongated hook.

The hook may be configured to allow the hook to extend from the first member out of the first extension in a first rotational position relative to the first member and to allow the hook to extend from the first member out of the second extension in a second rotational position relative to the first member. The first extension is larger or longer than the second extension. Thus, the length of the projection of the hook is determined by the rotational position of the hook relative to the first member.

In one embodiment, the first rotational position and the second rotational position are offset by about 90 ° with respect to each other.

In a further embodiment, the hook comprises a pin at the first end of the hook, the pin protruding from at least one side of the hook in a direction substantially perpendicular to the extension of the hook. In one embodiment, the pin is disposed diametrically through the hook. The pin may be configured to be vertically movable in at least one vertical slot provided in the first member. The slot is limited by a slot stop disposed in the first end of the slot and defining a length of the first extension of the hook. The pin is rotatable in one or more recesses disposed in the second end of the slot to engage a shelf disposed in the second end of the slot, the shelf defining a length of the second extension of the hook.

Each shelf may include a shelf stop that requires the hook to be further inserted into the first member to allow rotation into and out of the first rotational position.

In a second aspect, there is provided a lamp for attachment to a ceiling, the lamp comprising a light fitting according to the first aspect.

In a third aspect, a method for mounting a luminaire accessory according to the first aspect to a ceiling is provided. The method comprises the following steps: attaching a first member of a light fitting to a ceiling and adjusting a length of a portion of a second member protruding from the first member. Thereby, after the light fitting is mounted to the ceiling, the suspension height of the lamp attached to the light fitting can be changed. Of course, the projection may also be changed when the light fitting is not yet mounted to the ceiling.

In one embodiment of the invention, a method for mounting a luminaire comprises the steps of: adjusting a length of a portion of the second member protruding from the first member to facilitate access to the first member; attaching a first member of a light fitting to a ceiling; attaching a nut to the first member and thereby attaching the shell member to the first member; and adjusting the length of the portion of the second member protruding from the first member to a desired length.

In yet another embodiment, a method for installing a light fixture accessory includes the steps of: adjusting a length of a portion of the wire protruding from the first member by unlocking the lock member to allow extension of the wire to a length that facilitates access to the first member; attaching a first member of a light fitting to a ceiling; attaching a nut to the first member and thereby attaching the shell member to the first member; and adjusting a length of a portion of the wire protruding from the first member to a desired length by feeding the wire toward the first member.

In one embodiment, a method for installing a light fixture accessory includes the steps of: adjusting a length of a portion of the hook protruding from the first member by rotating the hook to a first rotational position to allow an extension of the hook to extend to a length to facilitate access to the first member; attaching a first member of a light fitting to a ceiling; attaching a nut to the first member and thereby attaching the shell member to the first member; and adjusting the length of the portion of the hook protruding from the first member to a desired length by feeding the hook towards the first member and rotating the hook into the second rotational position.

Drawings

The invention will be further described, by way of example, with reference to the accompanying drawings. In the drawings:

figure 1 shows a pendant according to one embodiment,

figure 2 shows a pendant according to one embodiment,

figures 3 to 5 show a light fitting according to different embodiments,

figures 6 and 7 illustrate adjustment of the projection of the second member of the light fitting,

figure 8 shows a cross-sectional view of a light fitting according to one embodiment,

figure 9 shows a light fitting according to one embodiment,

figure 10 shows a light fitting according to one embodiment,

figure 11 shows a first member of a light fitting according to one embodiment,

figures 12a to 12b show a hook of a light fitting according to one embodiment,

figure 13 shows a pin for a hook of a light fitting according to one embodiment,

figures 14a to 14b illustrate adjustment of a protrusion of a hook of a light fitting according to one embodiment,

fig. 15-18 are schematic views of methods for attaching a light fitting to a ceiling according to various embodiments.

Detailed Description

Referring to fig. 1-2, two embodiments of

ceiling lamps

30, 40 are shown. The

pendant lamp

30, 40 is typically suspended from the ceiling by means of the first member 11, 21 (fig. 3 and 9 respectively) of the associated

light fitting

10, 20, the

light fitting

10, 20 being most often included when purchasing the

pendant lamp

30, 40. Since the connectors and electrical connectors for attaching the

light fitting

10, 20 to the ceiling are generally desired to be hidden from view, a housing member 13, 23 (i.e., a ceiling rose box) that covers these portions of the

light fitting

10, 20 is generally provided.

The

light fitting

10, 20 further includes a

second member

12, 22 configured to be directly or indirectly connected to the

lamp

30, 40. As shown in fig. 1, the second member 12 is a wire 12 extending straight down from the ceiling to the lamp 30. In fig. 2, the second member 22 has the shape of an elongated hook 22. Then, the lamp 40 is indirectly connected to the hook 22 via the chain 41. Preferably, the

second member

12, 22 is different from the power cord PC. Thus, the

light fittings

10, 20 also support the power cord PC separately from the

second members

12, 22. This is particularly advantageous since the power cord PC does not need to carry the weight of the

ceiling lamps

30, 40.

Turning to fig. 3, the light fitting 10 is shown without the housing member 13. The light fitting 10 comprises a first member 11, the first member 11 serving as part of the fitting 10 that can be attached to a ceiling. In this case, a ceiling hook CH is attached to the ceiling, and the first member 11 includes a loop 114 attached to the hook CH. Other means for attaching the first member 11 to the ceiling are also envisaged.

The second member 12, i.e. the first end 121 of the wire 12, is attached to the first member 11, while the second end 122 of the second member 12 is attached directly or indirectly to the lamp as previously described. The first member 11 further comprises a lock member 111 in the shape of a linear lock 113, the lock member 111 having a resilient button 111a, the resilient button 111a allowing the second member 12 to move away from the first member 11 by sliding through the lock member 111, meaning downwards as shown in fig. 3, and towards the first member by sliding into the first member 11, meaning upwards as shown in fig. 3, when the resilient button 111a is pressed.

When the lock member 111 is in the non-depressed state, the second member 12 can still move but only in a direction towards the first member 11, i.e. upwards as shown in fig. 3. This results in one of the following solutions: a person hanging a light using the light fitting 10 described herein may simply fully extend the second member 12 while hanging the light to the ceiling, and then simply lift the light to the desired height while feeding the second member 12 into the first member 11. The first member 11 then supports the lamp at this new and desired height.

In fig. 4, an embodiment of the light fitting 10 is shown, wherein also the electrical wiring is shown, as well as how the connection box 115 is attached to the first member 11. It should be understood that the electrical wiring of the light fitting 10 is not an important part of the inventive concept and can be implemented in a variety of ways. For example, the electrical connector may be incorporated into the first member 11 or provided as a separate part which is then attached to the first member 11 or separately suspended from the ceiling.

The first member 11 shown in fig. 3 and 4 also has a cylindrical body 116, the cylindrical body 116 being provided with an external thread 112, the purpose of the external thread 112 becoming apparent when turning to fig. 5.

A part of the first member 11 and the second member 12 is covered by the case member 13. A housing member 13, sometimes referred to as a ceiling rose, protects the other components of the light fitting 10 and provides an overall aesthetic appearance of the light fitting. The housing member 13 is attached to the first member 11 by means of a nut 14, the nut 14 being configured to engage with the threads 112 of the first member 11 shown in fig. 3 and 4. The nut 14 includes a flange 141 as best shown in fig. 8. The flange 141 vertically supports the case member 13. Both the nut 14 and the housing member 13 include axially aligned bores 131, the bores 131 allowing the second member 12 to move relative to the nut 14 and the housing member 13, and allowing the nut 14 and the housing member 13 to move relative to the second member 12. This is important because the length of the portion of the second member 12 that protrudes from the first member 11 is also adjustable when the lamp 30 is fully assembled and mounted to the ceiling, as shown in fig. 6. If the lamp 30 is lowered, the elastic button 111a of the locking member 111 must be pressed.

As shown in fig. 6, the housing member 13 may include a second hole 132 through which the power cord PC may extend.

In fig. 7, a process for extending the length of the portion of the second member 12 that protrudes from the first member 11 is shown. As already mentioned above, in order to allow the second member 12 to protrude further from the first member 11, the linear lock 113 forming the lock member 111 must in this case be operated by pressing the resilient button 111a, meaning pushing upwards as shown in fig. 7, to unlock the lock member 111, i.e. the linear lock, so that the second member 12 can be moved out of the first member 11, i.e. downwards as shown in fig. 7, to reach the lowered position of the lamp.

In fig. 8, the light fitting 10 is shown in cross-section, such that the internal components of the first member 11 are visible. To achieve adjustability of the protruding length of the second member 12, the first member 11 is provided with a lock member 111 in the form of a linear lock 113. The linear lock 113 is spring loaded and self locking for withdrawing the second member 12 from the first member 11. The resilient button 111a forms part of the wire type lock 113 such that, when the resilient button 111a is pressed, the resilient button 111a pushes against the force of the spring and thereby releases the locking engagement of the wire type lock 113 on the second member 12. The linear lock 113 is per se a conventional product known to the person skilled in the art; the wire type lock may be configured in a variety of ways to achieve the desired functionality. It should also be noted that another known type of lock member 111 may be arranged such that the lock member 111 is accessible even when the nut 14 and the housing member 13 are attached to the first member 11. This allows the second member 12 to also extend from the first member 11 when the nut 14 and the housing member 13 are attached, thereby further simplifying the adjustment of the height of the lamp 30.

Turning now to fig. 9, another embodiment of a light fitting 20 is shown. The light fitting 20 of fig. 9 comprises a first member 21 configured to be attached to a ceiling. Since many features and functions are common to all embodiments, the following description of the embodiments will focus primarily on features that differ from previously described embodiments. The light fitting 20 comprises a second member 22 in the form of an elongate hook 22. The second member 22 is attached to the first member 21 so that the length of the portion of the hook 22 protruding from the first member 21 can be adjusted.

The first member 21 is provided with threads 212, the threads 212 being configured to engage with corresponding internal threads of the nut 24. The purpose and function of the nut 24 is the same as that described for the previous embodiment and will therefore not be described in further detail.

In fig. 10, the light fitting 20 is provided with a housing member 23. The housing member 23 includes a first hole 231, and the nut 24 is fitted into the first hole 231 to hold the housing member 23 in place. A second aperture 232 may also be provided through which a wire may be inserted.

Referring to fig. 11 to 14 together, the following mechanism will be described: by this mechanism, the length of the portion of the hook 22 that protrudes from the first member 21 is adjustable relative to the first member 21. The second member 22 includes a pin 222 disposed at a first end 221 of the second member 22. The pins 222 are arranged to pass diametrically through the second member 22 and project outwardly on opposite sides of the second member 22, thereby forming a generally T-shaped first end 221. This is shown in fig. 12a and in particular also in fig. 12b, which shows an enlarged section of the first end 221 of the second member 22. The pin 222 is configured to mate with the interior of the first member 21, as shown in fig. 11. The first member 21 is provided with at least one, and preferably two vertically extending slots 216, the slots 216 being formed radially outwardly from a central aperture 218 in the first member 21. The second member 22 may move vertically in the central bore 218. The pin 222 slides in the slot 216, allowing axial movement of the second member 22 to be limited downwardly by the slot stop 213, wherein the slot stop 213 defines a first, maximum, protruding length of the second member 22. This first protruding length of the second member 22, which is the maximum length that the second member 22 can extend from the first member 21, is typically used when mounting the light fitting 20 to a ceiling. Thus, this first protruding length of the second member 22 will be the "mounting position".

To enable the pin 222 to enter the slot 216, the second member 22 must be rotated into a first rotational position in which the pin 222 is aligned with the slot 216. In order to lock the second member 22 at the second protruding position corresponding to the insertion position, i.e., the shorter length of the portion of the hook 22 protruding outside the first portion member 21, a recess 214 is provided. After the light fitting 20 has been mounted to the ceiling and the light is ready for use, a second projection length of the second member 22 is typically used, which is the minimum length that the second member 22 can extend from the first member 21. Thus, this second protruding length of the second member 22 will be the normal "use position". The recess 214 is arranged at an upper portion of the first member 21 and is substantially mirrored in a cross-sectional plane as shown in fig. 11. The second member 22 is rotated into a second position relative to the first member 21, whereby the pin 222 enters the recess 214 and whereby the second member 22 is vertically supported by the interaction between the pin 222 and a respective shelf 217 arranged at the lower end of the recess 214. A shelf stop 215 may be provided, the shelf stop 215 preventing accidental rotation of the second member 22, by which shelf stop 215 the pin 222 leaves the shelf 217 and drops out of the recess 214 and to the slot stop 213. Alternatively or in combination with the shelf stop 215, the surface of each shelf 217 may be slightly inclined so that the pin 222 slides into the vertically lowest position in the recess 214. This will also help to secure the second member 22 in the second rotational position. Preferably, the first and second rotational positions are separated or offset by approximately 90 °.

In fig. 14a to 14b, a method of reducing the length of the portion of the second member protruding from the first part 21 is shown. It is beneficial if the second member 22 is held at the maximum extended length while the light fitting 20 is mounted to the ceiling, as this will facilitate access to components that would otherwise be hidden by the housing member 23. In fig. 14a, the second member 22 is shown when protruding from the first member 21 (the first member being hidden by the housing member 23) by a maximum distance d 1. Thereafter, when the first member 21 is attached to the ceiling and the electric wiring is completed, the case member 23 can be attached at a preferable height of the case member 23 by using the nut 24. Then, as indicated in fig. 14b, the second member 22 is simply pushed upwards towards the first member 21. When the pin 222 arranged in the first end 221 reaches the recess 214, the second member 22 is free to rotate into the second rotational position, whereby the second member 22 is vertically supported by the pin 222 resting on the shelf 217 arranged in the recess 214. Thus, the second member 22 is held in place by the reduced length, indicated by distance d2, protruding from the first member 21. For final height adjustment of the lamp, a chain is used and, as known per se, the desired height of the lamp is achieved by hanging appropriate links of the chain to the ends of the hooks 22.

In fig. 15, an outline of a method for mounting the

light fitting

10, 20 to a ceiling is shown. The method comprises a step 101 of attaching the

first member

11, 21 of the

light fitting

10, 20 to a ceiling, followed by a step 102 of the length of the portion of the

second member

12, 22 protruding from the

first member

11, 21. Thereby, after mounting the

light fitting

10, 20 to the ceiling, the height at which the lamp is suspended from the

light fitting

10, 20 can be adjusted.

Turning to fig. 16, an overview of another embodiment of a method for mounting a light fitting to a ceiling is shown. The method shown in fig. 16 comprises a step 201 of adjusting the length of the portion of the

second member

12, 22 protruding from the

first member

11, 21 in order to access the

first member

11, 21. That is, in step 201, the second member 22 is extended to a maximum or preferred length. In a subsequent step 202, the

first member

11, 21 of the

light fitting

10, 20 is attached to the ceiling, after which a step 203 is performed, in which step 203 the

nut

14, 24 is attached to the

first member

11, 21. In this step, the

housing members

13, 23 are attached to the

first members

11, 21 and the

light fitting

10, 20 is fixed against the ceiling. Then, in step 204, the length of the portion of the

second member

12, 22 protruding from the

first member

11, 21 may be conveniently adjusted to a desired length.

In fig. 17, a method for installing the light fitting of the embodiment shown in fig. 1 and 3 to 8 is shown. First, step 301 is performed, in which step 301 the length of the wire 12 protruding from the first member 11 is adjusted by unlocking the lock member 111 to allow extension to a length convenient for access to the first member 11. The length of the wire 12 protruding from the first member 11 may extend to a maximum length or any given length deemed sufficient. Then, in step 302, the first member 11 may be attached to the ceiling. Note that these two first steps may also be performed in the reverse order, i.e. the wires 12 may also be elongated while the light fitting 10 is suspended from the ceiling. To attach the housing member 13 to the first member 11, the nut 14 is attached to the first member 11 in step 303. As mentioned above, by tightening the nut 14, the housing member 13 is pressed up against the ceiling, which secures the light fitting 10. While the light fitting 10 is being fixed, the length of the wire 12 protruding from the first member 11 may be adjusted to a desired length in step 304. This is achieved by simply lifting the lamp and feeding the wire 12 towards and into the first member 11. The linear lock 113 of the first member 11 will allow the wire 12 to travel in an upward direction, but will automatically lock upon application of a downward force to the wire 12. It is also contemplated that the lock member 111 may also be operable after the nut 14 is attached to the first member 11. This will allow the wire 12 to be elongated even when the housing member 13 is mounted to the ceiling.

In fig. 18, a method for installing the light fitting 20 of the embodiment of fig. 2 and 9-14 is shown. First, in step 401, the length of the portion of the hook 22 extending outside the first member 21 is adjusted by rotating the hook 22 to a first rotational position to allow for extension to a length that facilitates access to the first member 21. In this position, pin 222 of hook 22 rests on slot stop 213 shown in fig. 11. The extension of the hook 22 allows the housing member 23 to be moved away from the first member 21 and this simplifies the mounting of the first member 21 to the ceiling and any other mounting tasks that may be required. In step 402, the first member 21 is attached to the ceiling by, for example, hanging the first member 21 from a pre-installed ceiling hook or using screws or other means for securing the first member 21 to the ceiling. While the first member 21 is secured to the ceiling, in step 403, the nut 24 may be attached to the first member 21, thereby attaching the shell member 23 to the first member 21. Then, in step 404, the length of the protruding portion of the hook 22 may be adjusted by feeding the hook 22 towards the first member 21 and then rotating the hook 22 into the second rotational position. The pin 222 then latches into the recess 214 to rest on the shelf 217 and support the hook 22 protruding to a lesser extent from the first member 21.

It should be mentioned that the inventive concept is in no way limited to the embodiments described herein, and that several modifications are possible without departing from the scope of the appended claims. In the claims, the term "comprising" does not exclude the presence of other elements or steps. Additionally, although individual features may be included in different claims, these may possibly advantageously be combined, and the inclusion in different claims does not imply that a combination of features is not feasible and/or advantageous. Furthermore, singular references do not exclude a plurality. The terms "a", "an", "first", "second", etc. do not exclude a plurality. Reference signs used in the claims are provided merely as a clarifying example and shall not be construed as limiting the scope of the claims in any way.

Claims

1. A light fitting (10, 20) for attaching a ceiling lamp (30, 40) to a ceiling, the light fitting (10, 20) comprising a first member (11, 21) and a second member (12, 22), the first member (11, 21) being attachable to the ceiling, the second member (12, 22) having a first end (121, 221) and a second end (122, 222), the first end (121, 221) being connected to the first member (11, 21), the second end (122, 222) being directly or indirectly connected to the ceiling lamp (30, 40), such that the second end (122, 222) protrudes from the first member (11, 21) in a direction towards the pendant (30, 40), wherein the length of the portion of the second member (12, 22) protruding from the first member (11, 21) is adjustable.

2. The light fixture accessory (10, 20) of claim 1, further comprising a housing member (13, 23) configured to at least partially cover the first member (11, 21), the housing member (13, 23) including a first aperture (131, 231) through which the second member (12, 22) extends.

3. The light fixture fitting (10, 20) of claim 2 wherein the first bore (131, 231) of the housing member (13, 23) is configured to be generally axially aligned with the first member (11, 21).

4. A light fitting (10, 20) according to claim 2 or 3, wherein said first member (11, 21) comprises a thread (112, 212), and wherein said light fitting (10, 20) further comprises a nut (14, 24), said second member (12, 22) extends through said nut (14, 24), and said nut (14, 24) is configured to engage with said thread (112, 212) of said first member (11, 21).

5. Lamp fitting (10, 20) according to claim 4 wherein the nut (14, 24) is axially movable relative to the second member (12, 22), the nut (14, 24) is rotatable relative to the lamp fitting (10, 20), and the nut (14, 24) comprises a flange (141, 241) configured to vertically support a housing member (13, 23).

6. The light fitting (10) according to any one of the preceding claims, wherein said second member (12) is a wire (12).

7. The light fixture fitting (10) according to claim 6, wherein the first member (11) is provided with a lock member (111), the lock member (111) being configured to allow unrestricted movement of the wire (12) in a direction towards the first member (11) and to restrict movement of the wire (12) in a direction away from the first member (11).

8. The light fitting according to claim 7, wherein said lock member (111) is arranged concentrically around said wire (12).

9. The light fixture accessory (20) according to any of claims 1-5, wherein the second member (22) is an elongated hook (22).

10. The light fixture accessory (20) of claim 9, wherein the hook (22) is configured to allow the hook (22) to extend a first extension from the first member (21) in a first rotational position relative to the first member (21) and to allow the hook (22) to extend a second extension from the first member (21) in a second rotational position relative to the first member (21), wherein the first extension is longer than the second extension.

11. The light fixture accessory (20) of claim 10, wherein the first and second rotational positions are offset by approximately 90 ° with respect to each other.

12. The light fitting (20) according to any of claims 10 to 11, wherein the hook (22) comprises a pin (222) at a first end (221) of the hook (22), the pin (222) protruding from at least one side of the hook (22) in a direction substantially perpendicular to the extension of the hook (22), the pin (222) being configured to be vertically movable in at least one vertical slot (216) provided in the first member (21), the slot (216) being limited by a slot stop (213), the slot stop (213) being arranged in a first end of the slot (216) and defining a length of the first extension of the hook (22), wherein the pin (222) is rotatable in at least one recess (214) arranged in the second end of the slot (216), to engage with a shelf (217) arranged in the second end of the slot (216), the shelf (217) defining the length of the second extension of the hook (22).

13. The light fixture accessory (20) of claim 12, wherein said at least one shelf (217) includes a shelf stop (215), said shelf stop (215) requiring said hook (22) to be further inserted into said first member (21) to allow rotation into and out of said second rotational position.

14. A lamp (30, 40) for attachment to a ceiling, the lamp (30, 40) comprising a light fitting (10, 20) according to any one of claims 1 to 13.

15. A method for mounting a light fitting (10, 20) according to any of claims 1 to 13 to a ceiling, the method comprising the steps of:

-attaching (101) the first member (11, 21) of the luminaire accessory (10, 20) to the ceiling, and

-adjusting (102) the length of the portion of the second member (12, 22) protruding from the first member (11, 21).

16. A method for mounting a light fitting (10, 20) according to claim 4 or any preceding claim dependent on claim 4 to a ceiling, the method comprising the steps of:

-adjusting (201) the length of the portion of the second member (12, 22) protruding from the first member (11, 21) in order to access the first member (11, 21),

-attaching (202) the first member (11, 21) of the light fitting (10, 20) to the ceiling,

-attaching (203) the nut (14, 24) to the first member (11, 21) and thereby attaching the housing member (13, 23) to the first member (11, 21),

-adjusting (204) the length of the portion of the second member (12, 22) protruding from the first member (11, 21) to a desired length.

17. A method for mounting a light fitting (10) according to claims 4 and 7 or any preceding claim dependent on claim 4 and claim 7 to a ceiling, the method comprising the steps of:

-adjusting (301) the length of the portion of the wire (12) protruding from the first member (11) by unlocking the lock member (111) to allow extending the extension of the wire (12) to a length convenient for accessing the first member (11),

-attaching (302) the first member (11) of the light fitting (10) to the ceiling,

-attaching (303) the nut (14) to the first member (11) and thereby attaching the housing member (13) to the first member (11), and

-adjusting (304) the length of the portion of the wire (12) protruding from the first member (11) to a desired length by feeding the wire (12) towards the first member (11).

18. A method for mounting a light fitting (20) according to claims 4 and 10 or any claim dependent on claims 4 and 10 to a ceiling, the method comprising the steps of:

-adjusting (301) the length of the portion of the hook (22) protruding from the first member (21) by rotating the hook (22) to the first rotational position to allow the extension of the hook (22) to extend to a length that facilitates access to the first member (21),

-attaching (302) the first member (21) of the luminaire accessory (20) to the ceiling,

-attaching (303) the nut (24) to the first member (21) and thereby attaching the housing member (23) to the first member (21),

-adjusting (304) the length of the portion of the hook (22) protruding from the first member (21) to a desired length by feeding the hook (22) towards the first member (21) and then rotating the hook (22) into the second rotational position.