SE542936C2 - Ligthing device comprising a control means for altering its appearance and light dispersion pattern - Google Patents

Abstract

A lighting device (1) comprising a hub (2) and a plurality of arms (5, 6) attachable to the hub (2), wherein each arm (5, 6) at each distal end (7, 8) thereof comprises at least one blade connector (10) onto which at least one blade (9) is attachable, and wherein the lighting device (1) further comprises control means (40).

Description

LIGTHING DEVICE íÅfíšlvílPšåš fššíråífiš A ífíÅšiNïiRíÅšíi ÉJEEÅLXNS FÜEš. ,f-°°,íjfÉ' EÉiR El*J(Åš ETSfåPPïåfäššfåNifië if-'XNÜ Lí~GH"í“ ÜÉSi?'E.RSiÛNT PfÄJYTEiKN Technical Field The present invention relates to the technical field of lighting devices andillumination in general. More specifically, the present invention relates to a ceiling lightwhich allows adjustment of the dispersion of light from a light source as well asalteration of the visual appearance of the lighting device.

Prior ArtLighting devices for indoor lighting are often provided by manufacturers as preassembled units, which allows little or no room for in a simple manner adjusting thevisual appearance of the lighting device. In the case of lamps that uses lampshades, thelampshades may be replaced to alter the appearance of the lamp. But this naturallyentails having to find a new lamp shade, providing that such are still provided by themanufacturer. However, there is an increasing demand for lamps that allowsmodif1cation not only of the appearance of the lamp but also of the light dispersionthereof And while most lamps are sold preassembled, there is nevertheless a trend thatlighting devices are increasingly common being sold as products that require someassembly by the costumer. This is a natural step in the process of lamp manufacturers toreduce the environmental impact of their products, as well as an important part ofstreamlining the manufacturing process. The main environmental benefit is that itallows a reduction in the physical size of each product, and/or the packaging thereof,during distribution and storing. However, it does add an additional complexity when itcomes to developing lighting devices that comprises moveable parts. Consequently, it isdesired to provide a lighting device which may be provided as a unit that can beassembled by the costumer to some extent, and which allows altering of the appearanceand/or the light dispersion thereof Related prior art can be found in WO 2014/ 194937A1.

SummagIt is therefore an object of the invention to at least partly overcome one or more of the above-identified limitations of the prior art. In particular, it is an object to providea lighting device which in a simple way can manipulated in order to alter the visual appearance thereof and/or the light dispersion therefrom.

In a first aspect, a lighting device is provided. The lighting device comprises ahub and a plurality of arms attachable to the hub, each arm at each distal end thereofcomprises at least one blade connector onto Which at least one blade is attachable.Control means are arranged to control the position of each blade connector in relation toeach arrn. The angle of the blades in relation to the arrns, and thus to the hub and thelight source thereof can thereby by altered, providing a simple and convenient Way toalter the exterior of the lighting device. The light emitted from the light source may alsobe dimmed/dispersed depending on the position of the blades. Such a control meansmay for instance be a Wire connected to the blade connectors, an electric actuator suchas a linear motor, an electromagnet actuator etc. In one embodiment, control means arearranged in each arm, being separately controllable to control the position of the bladeconnectors on each arm individually.

The control means may be arranged at the hub and comprise a base portion andan actuating member. The position of each blade connector in relation to each arm maybe controlled by a movement of the actuating member in relation to the base portion.

Furthermore, each arm may comprise a moveable member attachable to theactuating member, and a main portion attachable to the base portion. The configurationof the arms allows them to be removed from the hub during distribution and storingWhile the assembly is kept simple and straightforWard.

At least one Wire connected to the moveable member may control themovement of each blade connector.

Each blade connector may further be connected to the arm by at least tWoconnections.

A first connection may be a hinge joint def1ning a pivot point and a secondconnection may be a sliding connection.

Each arm at each distal end thereof may comprise a distal moveable member,the movement of the distal moveable member being controlled by the moveablemember. Each blade connector may be connected to a finger on the main portion and toa finger on the distal moveable member.

Furthermore, on each arm may at least one Wire connect the moveable memberWith each distal moveable member. The Wire transfers the force from the actuatingmember to the distal moveable member, and is suff1ciently strong to provide a pushing force to the distal moveable member.

The first connection may be between a blade connector and a finger on themain portion and the second connection may be between the blade connector and acorresponding finger on the distal moveable member.

The first connection may be radially outside of the second connection inrelation to the movement axis of the distal moveable member.

Each arm may comprise an upper distal end and a lower distal end protrudingangularly offset from each other in a vertical plane when the arm is mounted on the hub.Each distal end having a plurality of blade connectors, preferably five blade connectors,and wherein one blade is connectable to each blade connector.

The lighting device may comprise two types of arms, the distal ends on a firstarm being angularly offset from the distal ends on a second arm. The distal ends canthus be brought closer together, which allows a greater dimming effect by the blades.

The angular offset between the first arm and the second arm may further besuch that when six arms are arranged altematingly around the circumference of the hubwill the distal ends be arranged according to the vertices in a regular icosahedron or aspherical polyhedral, or a stellated dodecahedron or a regular dodecahedron. Such apattem provides a sufficient dimming capability by the blades, as well as a symmetricappearance to lighting device.

The hub may comprise a plurality of first connectors and a plurality of secondconnectors. The first and second connectors are arranged altematingly around thecircumference of the hub, and each arm type is only attachable to either the firstconnector or the second connector. Hence is assembly of the lighting device facilitated,as the arms cannot be attached in an incorrect position on the hub.

The base portion of the hub may comprise a leadscrew, the leadscrew beingrotatable in relation to the base portion of the hub, and the actuating member is athreaded ring axially moveable by rotation of the leadscrew.

The leadscrew may furtherrnore be rotatable by means of at least one string, theat least one string comprises two ends and a pulling force exerted on a first end causesaxial movement of the threaded ring in one direction, and a pulling force exerted on asecond end causes axial movement of the ring in the opposite direction. The appearanceand light dispersion of the lighting device can thereby be altered in a convenient andreliable fashion.

The position of the actuating member may be controlled by an electric motor,allowing the lighting device to be altered automatically without having to physicallytouch the lighting device.

The electric motor may further be in driving connection with the leadscrew.

Each blade may be attachable to a blade connector by means of a blade holder.The blade holder comprises a first part and a second part being confrgured to bearranged on opposite sides of the blade and being connectable to each other through atleast one hole in the blade. The first part is arranged on the side of the blade facing thehub, said first part being attachable to the blade connector. The blade holder facilitatesassembly of the lighting device, as well as distribution thereof It further facilitatesreplacement of the blades, so that new blades can be f1tted to, for instance, change theappearance of the lighting device.

The lighting device may be a pendant ceiling lamp.

Brief Description of the Drawings The present invention will be described further below by way of example andwith reference to the enclosed drawings. In the drawings: Fig. 1 shows a perspective view of a lighting device according to oneembodiment, Fig. 2 shows a perspective view of a lighting device according to oneembodiment, Fig. 3 shows a detail view of a hub of a lighting device according to oneembodiment, Figs 4 and 5 show detail views of a hub of a lighting device with the actuatingmember in its two axial end positions according to one embodiment, Figs 6 and 7 show a distal end according to one embodiment with the blades ina position corresponding to an actuating member position shown in Fig. 4, Figs 8 and 9 show a distal end according to one embodiment with the blades ina position corresponding to an actuating member position shown in Fig. 5, Fig. 10 shows a detail view of a distal end according to one embodiment, Fig. 11 shows a lighting device according to one embodiment, and Fig. 12 shows a distal end and an associated blade according to one embodiment.

Detailed Description of EmbodimentsThe disclosed embodiments will now be described more fully hereinafter withreference to the accompanying drawings, in which certain embodiments of the invention are shown. Like numbers refer to like elements throughout.

Fig. 1 shows a lighting device 1 according to one embodiment. The lightingdevice 1 shown is a pendant ceiling lamp 1, but it could just as well be embodied as atable lamp or any other type of lamp. As shown, the lighting device 1 comprises a hub2, forrning the central support structure onto which all other components of the lightingdevice 1 are attached. The hub 2 comprises an optional cover 33, which hides some ofthe interior components of the hub 2 from view and provides an aesthetically pleasingappearance. The cover 33 further protects the intemals of the hub 2 from dust and/ordirt, which may otherwise compromise the function of the lighting device 1. It may alsoprovide some protection to components that are susceptible to corrosion. To the hub 2are a number of arms 5, 6 attached. The arms 5, 6 are releasable, and may be providedas separate parts that require assembly and mounting to the hub 2 by the customer.

Each arm 5, 6 further comprises at least one distal end 7, 8 (distal in relation tothe hub 2), shown here as an upper distal end 7 and a lower distal end 8. Each distal end7, 8 comprises a number of blades 9, in the shown embodiment it is five blades 9 butnaturally may also fewer or more blades 9 be provided. The blades 9 disperses anddirects the light emitted by at least one light source, shown as a light bulb, at the hub 2.The distal ends 7, 8 on each arm 5, 6 are arranged or protrudes with equal verticalangular offset such that the distal ends 7, 8 on each arm 5, 6 are equally spaced in thevertical direction. What is also shown in Fig. 1 is that the lighting device 1 is providedwith two different types of arms 5, 6. A first arm type 5 has distal ends 7, 8 that areangularly offset vertically from the distal ends 7, 8 of a second arm type 6. The armtypes 5, 6 are further altematingly arranged around the hub 2, which results in a pattemof how the distal ends 7, 8 are arranged which essentially coincides with the vertices ofa regular icosahedral, or a spherical polyhedral, or a stellated dodecahedron or a regulardodecahedron. Other shapes are also possible, such as for instance a cubical or cuboidshape.

Each blade 9 is attached to the respective distal ends 7, 8 by means of a bladeconnector 10 (shown in Figs 7-11) which forms a part of the distal ends 7, 8. In order tochange the dispersion of light from the lighting device 1 and the visual appearancethereof, each blade connector 10 is moveable in relation to the arms 5, 6. The bladeconnectors 10 are controlled by control means 40. The control means 40 may forinstance be a wire connected to the blade connectors 10, an electric actuator such as anelectric motor, a linear motor, and/or an electromagnet actuator etc. A control means 40,such as an electric actuator, may furtherrnore be arranged in each arm 5, 6, and be separately controllable to control the position of the blade connectors 10 on each arm 5, 6 individually, or as a unit. The control means 40 may be controlled remotely by asuitable wireless signal such as optical signals or RF signals such as WIFI, Bluetooth®etc.

In the embodiment shown in Figs 1 to 5, the control means 40 for controllingthe movement of the blade connectors 10 comprises a base portion 3 and an actuatingmember 4 arranged at the hub 2, which will be described in further detail below. Theblade connector and hence the blade positions can consequently be altered from thatshown in Fig. 1, to that shown in Fig. 2, and preferably in a step-less manner that allowsthe blades 9 to attain any position between those shown as well. In Fig. 2, the lightingdevice 1 is shown with the blades 9 in a position providing more lightdispersion/dimming than in that of Fig. 1, and which gives the lighting device 1 analmost round appearance, or appearance of a spherical polyhedral, or a stellateddodecahedron.

In Fig. 3, the hub 2 of the lighting device 1 is shown with the cover 33removed and only one arm 5, 6 attached. The lighting device, as mentioned, comprisescontrol means 40, shown as an actuating member 4 that is moveable in relation to thebase portion 3. The control means 40 may thus form a part of the hub 2. The arm 5, 6 isattached to the hub 2 such that a moveable member 16 of the arm 5, 6 is attached to theactuating member 4 of the hub 2. Furthermore, a main portion 15 of the arm 5, 6 isattached to the base portion 3 of the hub 2. The main portion 15 is the stationary part ofthe arms 5, 6 and functions as the supporting structure of the distal ends 7, 8.

Preferably are snap-lock connectors used for simple attachment of the arms 5,6 to the hub 2. Further simplifying the assembly of the lighting device 1, the hub 2 isprovided with two different connectors 24, 25, which are altemated around thecircumference of the base portion 3. These will facilitate that the correct arm type 5, 6 isattached to the correct position on the hub 2, as the different arm types 5, 6 will only beattachable to the positions with the correct corresponding connector 24, 25. As can beseen, a first connector 24 has a round shape and will thus only be attachable to the mainportion 15 of an arm 5, 6 with a corresponding round opening into which the firstconnector 24 will fit. A second connector 25 has a rectangular shape, and will thusconsequently only be attachable to an arm 5, 6 with a corresponding rectangularopening.

The altemating connectors 24, 25 are shown being arranged on the base portion3, with the actuating member 4 being provided with snap-lock connectors 37 that are all essentially identical. However, it is also conceivable that altemating connectors 24, 25 also are arranged on the actuating member 4, or that the altemating connectors 24, 25are only arranged on the actuating member 4 with identical snap-lock connectors 37being arranged on the base portion 3.

It is also to be noted that the connectors 24, 25, 37 are all accessible when thearms 5, 6 are mounted, which is required for a user to able manipulate the snap-lockconnectors 24, 25, 37 to remove the arms 5, 6 from the hub 2, once the lighting device 1has been assembled.

The moveable member 16 of each arm 5, 6 is moveable in relation to the mainportion 15. The moveable member 16 is connected to the blade connectors 10 via wires11, 12. The wires 11, 12 are arranged largely hidden inside the main portion 15 of thearms 5, 6 and preferably is one wire 11, 12 per distal end 7, 8 provided. The wires 11,12 are preferably metal wires due to the benef1cial durability and strength thereof;however, elongated plastic wires/threads may just as well be used.

Tuming now to the hub 2, of which the base portion 3 is configured to bestationary. The base portion 3 comprises pillars 31, preferably three but fewer or morepillars 31 may also be used. The pillars 31 connects the lower part of the base portion 3with the upper part. The actuating member 4 is preferably a threaded ring 4, axiallymoveable by the rotation of a leadscrew 19. The leadscrew 19 is rotatably arrangedbetween the upper and lower part of the base portion 3. During the axial motion of theactuating member 4, the pillars 31, which extends through openings the actuatingmember 4, will ensure that the actuating member 4 does not rotate with the leadscrew19. The leadscrew 19 is preferably in self-locking engagement with the ring 4, such thatan axial force on the ring 4 will not cause rotation of the leadscrew 19.

The leadscrew 19 is to be taken as a preferred altemative for achieving theaxial motion of the actuating member 4. However, it is also possible that other types oflinear actuators can be used for achieving this movement. For instance may a linearmotor be used, or a pinion gear/ gear rack arrangement.

In one embodiment, the leadscrew 19 is driven by an electric motor. Thecontrol of the electric motor may in one embodiment be achieved remotely by a suitablewireless signal such as optical signals or RF signals such as WIFI, Bluetooth® etc.

The leadscrew 19 may also be manually actuated and be provided with at leastone string 20 as an altemative to the electric motor or in combination therewith. The atleast one string 20 is wound around the leadscrew 19 with a first end 21 and a secondend 22 hanging below the hub 2. The first end 21 connects via a wheel 34 essentially tangentially to the leadscrew 19, while the second end 22 connects to the leadscrew 19 via a wheel 34 similarly to the first end but in the opposite tangential direction to that ofthe first end 21. As follows will a pulling force exerted on the first end 21 and thesecond end 22 respectively cause opposite rotational directions of the leadscrew 19 andthus also oppositely directed axial movements of the actuating member 4. The at leastone string 20 may be a single string 20 wound around the leadscrew 19 or two separatestrings 20.

In Figs 4 and 5 is the actuating member 4 shown in its two axial end positions.Fig. 4 shows the actuating member 4 in its upperrnost axial position, in which the wires11, 12 are as extracted from the main portion 15 of the arms 5, 6 as possible. Thisposition of the actuating member 4 corresponds to the blade connector 10/blade 9positions shown in Figs 8 and 9.

In Fig. 5, the actuating member 4 is instead arranged in the lowerrnost axialposition where the wires 11, 12 as a result are arranged almost entirely inserted into themain portion 15. This position of the actuating member 4 corresponds to the bladeconnector 10/blade 9 positions shown in Figs 6 and 7.

Figs 6 and 7 shows a distal end 7, 8 of an arm 5, 6. Each distal end 7, 8comprises a plurality of blades 9, preferably 5 blades, and each blade 9 is connected to ablade connector 10. The blade connector 10 in tum is connected to a distal moveablemember 23 and to the main portion 15, or more specifically to fingers 17, 18 on therespective parts. The distal moveable member 23 is via one of the wires 11, 12connected to the actuating member 4, which thus controls the movement thereof inrelation to the main portion 15. The blade connector 10 therefore comprises a firstconnection 13 and a second connection 14, where the first connection 13 is defined asthe connection between each connector 10 and a corresponding finger 18 on the mainportion 15. The second connection 14 is defined as the connection 14 between eachconnector 10 and the distal moveable member 23, preferably a finger 17 thereof.

The distal moveable member 23 and the main portion 15 comprises the sameamount of fingers 17, 18, which corresponds to the number of blade connectors 10 oneach distal end 7, 8. The fingers 18 on the main portion 15 are arranged radially outsideof the fingers 17 on the axially moveable member 23, and thus is the first connection 13arranged radially outside of the second connection 14. The radial direction beingdefined by the movement axis of the distal moveable member 23. Preferably are fivefingers 17, 18 arranged on the main portion 15 and the distal moveable member 23.

The first connection 13 is preferably a hinge connection, forrning a pivot point around which the blade connector 10 (and hence the blade 9) pivots. The second connection 14 is preferably a sliding connection, as each blade connector 10 comprisesa slot 38 in which a pin 39 on the corresponding finger 17 slides. Having the pivot pointof the connector 10 on the fingers 18 of the main portion 15 is benef1cial as it allowspositioning of each distal end 7, 8 closer to the adjacent one. However, it is alsopossible that the sliding connection is arranged between each blade connector 10 and acorresponding finger 18 on the main portion 15, with the pivot point of the distalmoveable member 23. For assembly purposes, the slot 38 may comprise an expansionor opening that allows insertion of the pin 39 into the slot 38. The expansion ispreferably arranged in a position of the slot 38 that is unreachable by the pin 39 duringnormal use of the lighting device 1, to avoid that the pin 39 unintentionally falls out ofengagement from the slot 38.

Each distal moveable member 23 further comprises a rod 35 that is reciprocallymoveable in the base portion 15 and to which one of the wires 11, 12 is attached. Therod 35 guides the motion of the distally moveable member 23, and is preferablyconf1gured such that rotational movement of the distally moveable member 23 inrelation to the main portion 15 is prevented.

Generally, the distal moveable members 23 generates little resistance duringtheir reciprocal movement, and the pushing force from the wires 11, 12 being forcedinto the main portion 15 by the actuating member 4 is thus sufficient for attaining thepositions shown in Figs 6 and 7. However, in one embodiment, a spring may beprovided which provides a biasing force on each distal moveable member 23 towardsthe position shown in Figs 6 and 7 and which thus reduces the pushing force required byeach wire 11, 12.

Figs 8 and 9 show a distal end 7, 8 where the blade connectors 10 and theblades 9 are arranged in the position corresponding to the actuating member 4 positionshown in Fig. 4.

Fig. 10 shows a detail view of a blade connector 10. The finger 18 on the mainportion 15 as well as the finger 17 on the distal moveable member 23 are shown and therespective connections 13, 14 to the blade connector 10. As can also be seen, the bladeconnector 10 connects to a blade holder 30, the blade holder 30 in tum holds the blade9. The slot 38 into which the pin 39 on the finger 17 of the distally moveable member23 is arranged is also visible.

Fig. 11 shows how the at least one string 20 of the lighting device 1 is directedfrom the hub 2 and downwards past the light source. A horizontal support ring 32 is also shown, to which each of the arms 5, 6 is attachable and which provides stability to arms5, 6 of the lighting device 1.

Undemeath the ring 32 is a U-shaped frame 33 attached to the underside of thering 32 such that it extends below the light source from one side of the ring 32 to theother opposite side. The two ends 21, 22 of the at least one string is then threadedthrough respective oppositely arranged holes in the ring 32 and then through arespective side of the hollow U-shaped member 33. Both ends 21, 22 exits and extendsthrough a central opening in the U-shaped member 33 and hangs freely therefrom belowthe lighting device 1, such that they may be easily reached in order to alter theappearance and light dispersion of the lighting device 1.

Tuming now to Fig. 12, which shows how a blade 9 is connected to the bladeconnector 10. Each blade 9 is attached to a blade holder 30. The blade holder 30comprises a first part 26 and a second part 27 that are conf1gured to be arranged onopposite sides of the blade 9 and which are connectable to each other through at leastone hole 28, 29 in the blade 9. Preferably, two holes 28, 29 are arranged on each blade9. The first part 26 and the second part 27 are preferably releasable from each otheronce connected, so that the blades 9 can be replaced or switched when desired. Theblade holders 30 are also releasable from the blade connectors 10, which facilitatesreplacement of the blades 9. As can be seen, the first part 26, which is arranged on theside of the blade 9 facing the hub 2, comprises a protrusion 36 that is configured to bereceived by the blade connector 10 and thus attaches the blade holder 30 with the blade9 to the blade connector 10.

It should be mentioned that the inventive concept is by no means limited to theembodiments described herein, and several modifications are feasible without departingfrom the scope of the appended claims. In the claims, the term “comprises/comprising”does not exclude the presence of other elements or steps. Additionally, althoughindividual features may be included in different claims, these may possiblyadvantageously be combined, and the inclusion in different claims does not imply that acombination of features is not feasible and/or advantageous. In addition, singular a: aa a:a, references do not exclude a plurality. The terms , an”, “first”, “second” etc. do notpreclude a plurality. Reference signs 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 (20)

1. A lighting device (1) comprising a hub (2) and a plurality of arms (5, 6)attachable to the hub (2), Wherein each arm (5, 6) at each distal end (7, 8) thereofcomprises at least one blade connector (10) onto Which at least one blade (9) isattachable, characterized in that control means (40) are arranged to control the position of each blade connector (10) in relation to each arrn (5, 6).

2. Lighting device (1) according to claim 1, Wherein said control means (40) isarranged at said hub (2) and comprises a base portion (3) and an actuating member (4),Wherein the position of each blade connector (10) in relation to each arrn (5, 6) is controlled by a movement of the actuating member (4) in relation to the base portion (3)-

3. Lighting device (1) according to claim 2, Wherein each arrn (5, 6) comprisesa moveable member (16) attachable to the actuating member (4), and a main portion(15) attachable to the base portion (3).

4. Lighting device (1) according to claim 3, Wherein at least one Wire (11, 12) connected to the moveable member (16) controls the movement of each blade connector (10).

5. Lighting device (1) according to any of claims 1 to 4, Wherein each blade connector (10) is connected to the arrn (5, 6) by at least two connections (13, 14).

6. Lighting device (1) according to claim 5, Wherein a first connection (13) is a hinge joint def1ning a pivot point and a second connection (14) is a sliding connection.

7. Lighting device (1) according to claim 3, Wherein each arrn (5, 6) at eachdistal end (7, 8) thereof comprises a distal moveable member (23), the movement of thedistal moveable member (23) being controlled by the moveable member (16), andWherein each blade connector (10) is connected to a finger (18) on the main portion (15) and to a finger (17) on the distal moveable member (23). 12

8. Lighting device (1) according to claim 7, wherein on each arm (5, 6) at leastone wire (11, 12) connects the moveable member (16) with each distal moveablemember (23).

9. Lighting device (1) according to claim 7 or 8 when dependent on claim 6,wherein the first connection (13) is between a blade connector (10) and a finger (18) onthe main portion (15) and the second connection (14) is between the blade connector (10) and a corresponding finger (17) on the distal moveable member (23).

10. Lighting device (1) according to claim 9, wherein the first connection (13)is radially outside of the second connection (14) in relation to the movement axis of the distal moveable member (23).

11. Lighting device (1) according to any one of the preceding claims, whereineach arm (5, 6) comprises an upper distal end (7) and a lower distal end (8) protrudingangularly offset from each other in a vertical plane when the arm (5, 6) is mounted onthe hub (2), each distal end (7, 8) having a plurality of blade connectors (10), preferably five blade connectors (10), wherein one blade (9) is connectable to each blade connector (io).

12. Lighting device (1) according to claim 11, wherein the lighting device (1)comprises two types of arms (5, 6), the distal ends (7, 8) on a first arm (5) beingangularly offset from the distal ends (7, 8) on a second arm (6).

13. Lighting device (1) according to claim 12, wherein the angular offsetbetween the first arm (5) and the second arm (6) is such that when six arms (5, 6) arearranged altematingly around the circumference of the hub (2) will the distal ends (7, 8)be arranged according to the vertices in a regular icosahedron, or a spherical polyhedral, or a stellated dodecahedron or a regular dodecahedron.

14. Lighting device (1) according to claim 12 or 13, wherein the hub (2)comprises a plurality of first connectors (24) and a plurality of second connectors (25),the first and second connectors (24, 25) being arranged altematingly around thecircumference of the hub (2), and wherein each arm type (5, 6) is only attachable to either the first connector (24) or the second connector (25). 13

15. Lighting device (1) according to any one of the preceding claims When alsodependent on claim 2, Wherein the base portion (3) of the hub (2) comprises a leadscreW(19), the leadscreW (19) being rotatable in relation to the base portion (3) of the hub (2),and Wherein the actuating member (4) is a threaded ring (4) axially moveable by rotation of the leadscreW (19).

16. Lighting device (1) according to claim 15, Wherein the leadscreW (19) isrotatable by means of at least one string (20), the at least one string (20) comprises tWoends (21, 22) and Wherein a pulling force exerted a first end (21) causes axial movementof the threaded ring (4) in one direction, and a pulling force exerted on a second end (22) causes axial movement of the ring (4) in the opposite direction.

17. Lighting device (1) according to any one of the preceding claims When alsodependent on claim 2, Wherein the position of the actuating member (4) is controlled by an electric motor.

18. Lighting device (1) according to claim 17 When dependent on claim 15, Wherein the electric motor is in driving connection With the leadscreW (19).

19. Lighting device (1) according to any one of the preceding claims, Wherein each blade (9) is attachable to a blade connector (10) by means of a blade holder (30),the blade holder (30) comprises a first part (26) and a second part (27) being configuredto be arranged on opposite sides of the blade (9) and being connectable to each otherthrough at least one hole (28, 29) in the blade (9), and Wherein the first part (26) isarranged on the side of the blade (9) facing the hub (2), said first part (26) beingattachable to the blade connector (10).

20. Lighting device (1) according to any one of the preceding claims, Wherein the lighting device (1) is a pendant ceiling lamp (1).