EP3279920B1 - Centering element and fixing means for electrical lighting means - Google Patents

Description

The invention relates to a centering element for centering an electrical lighting means, such as a tubular lamp or a tubular radiator, in a cladding tube, and a mounting for an electrical lighting means which has at least one of these centering elements.

Tubular illuminants are often arranged in a transparent jacket tube, the inner diameter of which is greater than that of the lamp or the radiator, in order to protect the lamp surface and possibly also the terminal electrical contacts from contact and contamination, etc.

In this context, lamps are understood to mean illuminants, the main purpose of which is to illuminate with light in the visible wavelength spectrum, while radiators also include all UV and IR radiation sources that are used technically for photochemical reactions, disinfection, etc. For the sake of simplicity, only “lamps” can be used in the following; However, other light sources such as UV lamps should always be understood in the corresponding context.

The arrangement of the illuminant in the cladding tube can, depending on the length and diameter, be associated with difficulties, so that the cladding tube can be scratched if it is not inserted exactly axially through the lamp ends. In addition, not only axial insertion is desirable, but also a centered arrangement of the illuminant in the cladding tube in order to achieve uniform illumination or irradiation of the surroundings surrounding the cladding tube.

From the DE 10 2009 007 859 A1 a ceramic centering element for improved holding of the inner electrode within a dielectric barrier discharge lamp is known. The centering element has an axial opening through which the elongated inner electrode runs and extends essentially from the inner electrode to the inside of the outer tube, so that the inner electrode is centered in the outer tube, the diameter of the centering element being smaller than the inner diameter of the Outer tube, to prevent jamming. Its wall has parts which are formed radially in the direction of the inner electrode to support the centering element against axial slipping.

U.S. 3,249,781 A describes a lamp holder with a centering element for centering holding a lamp in a cladding tube. The centering element, the area of which is smaller than the cross section of the cladding tube, has an axially central bore and elastic spring elements which extend in sections on an outer circumference of the centering element and provide a radial restoring force.

Based on this prior art, the object of the invention is to provide a centering element by means of which a light source, in particular a tubular light source, can be axially inserted into a smooth-walled cladding tube and axially centered without the inside wall of the cladding tube being scratched or otherwise damaged.

This object is achieved by a centering element with the features of claim 1.

The further object of being able to handle a lighting means more easily and safely is achieved by the holder having the features of independent claim 9.

Developments are set out in the subclaims.

A centering element according to the invention, which is provided for centering a lamp in a cladding tube, has a disc base body with an axially central bore for receiving the lamp, the diameter of the disc base body being smaller than an inside diameter of the cladding tube. In principle, the disk base body can have further bores which are arranged specifically for use. A disk base body is understood to mean a cylindrical body, the radius of which is many times greater than its thickness. A disk base body of a centering disk according to the invention can, however, similar to a hub, have a base section around the axially central bore, which is offset from the disk section and can be manufactured in one piece with it. The type of illuminant that is inserted and placed in a cladding tube with a centering disk according to the invention can is in no way restricted here; both lamps and emitters such as fluorescent tubes, dielectrically hindered discharge lamps, high, medium and low pressure lamps as well as LED lamps, excimer lamps, incandescent lamps, induction lamps, sodium vapor lamps, halogen lamps, metal halide lamps, sodium vapor lamps, laser lamps, energy-saving lamps and HID lamps in general, in which a large number of LEDs are arranged on a holding and / or cooling body, can be inserted axially centered into a cladding tube by a centering element according to the invention and positioned there.

In order to enable simple and safe, centered insertion of the illuminant as well as secure positioning in a cladding tube, the inner wall of which must be smooth-walled in order to enable even radiation to pass through without reflections, the centering element has at least one elastic spring element that extends at least in sections or all around extends the outer circumference of the disc base body and provides a radial restoring force. When inserted into the cladding tube, the elastic spring element is compressed radially against its restoring force and thus ensures a uniform circumferential spacing of the centering element and thus the illuminant received by it from the inner wall of the cladding tube. At the same time, the elastic spring element enables the centering element to slide along the inner wall of the cladding tube and, through the restoring force, ensures a certain axial hold in the cladding tube in the desired position. A tubular illuminant can be conveniently, safely and simply placed precisely in a cladding tube without damaging the cladding tube on the inside, which would be disadvantageous for uniform radiation exit and operational reliability, apart from the visual and aesthetic impairment. Furthermore, the centering element enables tool-free assembly of the illuminant in the cladding tube and also prevents assembly errors. Forces that act on the lamp base in the event of angular misalignment and vibrations can be compensated for by the spring element.

It is advantageous if the spring element extends circumferentially around the disk base body; However, several spring elements can also be evenly distributed around the circumference of the disk base body - although two spring elements, which are arranged at opposite points on the circumference, can in principle be sufficient for this purpose; However, in order to enable an exact and simple axially-centered insertion and placement, three or more spring elements evenly distributed around the circumference are desirable.

A spring element, which extends around the entire circumference, is provided by a resilient wire winding, the wire being guided through a plurality of axially parallel openings on the edge of the disk base body, thus forming a worm spring, i. H. resemble a coil spring bent into a circle.

Alternative spring elements are individual spring bodies made of wire, which are attached to the circumference or are likewise guided through axially parallel openings on the edge of the disk base body and are thus attached.

The wire for the wire winding or the spring body can be a flat or round wire. For the wire winding, round wire can be preferred because of the torsion that occurs in the wire and also because it is easier to manufacture than flat wire. The diameter and opening profile of the axially parallel openings can be designed according to the diameter and profile of the wire selected for the spring element; simple circular bores are sufficient for round wire. For individual spring bodies that are guided through an axially parallel opening, flat wire may be more advantageous, depending on the design of the spring body, since it is held in a rotationally fixed manner in a corresponding slot-shaped opening so that the individual spring body cannot escape when it is inserted into the cladding tube. For example, individual rings made of flat wire, which are arranged distributed over the circumference of the disk base body, are then also conceivable as the spring body. The wire material used is metal or, depending on the type of light source, also a correspondingly temperature-stable and optionally UV-stable plastic.

As an alternative to the winding or spring bodies made of wire, a circumferential or sectional foam layer is also provided as the elastic spring element, which foam layer can be attached to the edge of the disk body, for example by gluing. The foam material used, which can be formed by foamed plastic, is to be selected to be light- or UV- and / or heat-resistant according to the type of light-emitting means to be centered with the centering element.

Depending on the spring rate or spring constant of the elastic spring element, which is dependent on the material, its thickness and the modulus of elasticity, etc., the elastic spring element has a certain relative to the inner diameter of the cladding tube Excess in order to be able to exert a corresponding pressure on the inner wall of the cladding tube during insertion and placement. The pressure exerted on the inner wall of the cladding tube by the radial restoring force can be predetermined and thus fixed. The axially central bore of a centering element according to the invention can be designed directly to receive a light source and, for this purpose, may have structures such as form-fit elements, a thread or latching elements. Preferably, however, the mounting of a connection element for the lighting means is provided in the axially central bore, since this achieves greater variability in that different connection elements can be used depending on the lighting means. The connection element can be in one or more parts and is detachably fastened to the disk base body, for example by means of a plug-in or screw solution. The connection element preferably forms a fastening and contact device for the detachable mechanical fastening and for the detachable electrical contacting of the base of the illuminant on the centering element.

In addition to the axially central bore, it is possible that the disc base body of the centering element has at least one eccentric bore for mounting purposes, which is designed directly for the detachable attachment of a rod and can optionally have structures such as form-fit elements, a thread or latching elements for this purpose. But here, too, it is preferably provided that the eccentric bore (s) can accommodate a connection element for the linkage, which can be made up of one or more parts and is detachably fastened to the disk base body, for example by plugging or screwing. Preferably, the connection element not only ensures a releasable mechanical fastening of the linkage to the centering element, but at the same time also provides a releasable electrical contact when the linkage, in addition to the holder, simultaneously fulfills the task of the electrical supply line.

For this purpose, an electrical bridge element, for example wire bridges made of metal strands or metal strips, can be arranged between the connection element of the eccentric bore and the connection element of the axially central bore. In the event that the centering element does not have any separate connection elements, electrical contact can be established, for example, by means of applied conductor tracks.

There are preferably at least two eccentric bores for the detachable fastening of a linkage, which are symmetrical to the axially central bore in order to achieve a more stable mounting.

The disk base body can be made of a metallic material, for example a stainless steel; however, a ceramic material can advantageously be used, since it has a high dielectric strength.

A lamp holder according to the invention has at least one centering element according to the invention. The centering element supports the introduction and precise positioning of a lamp in a cladding tube, so that the lamp is always axially central in the cladding tube. The centering element protects against radial misalignment, but allows axial movement. In order to fix the lamp axially in the cladding tube at the intended position, a linkage, preferably made of metal tubes, is provided, one of which is mechanically releasably fastened and electrically contacted in one of the eccentric bores of the centering element.

The linkage can be surrounded by an insulator sleeve, which is formed, for example, by glass sleeves with plug-in sections.

Because of the use of the illuminant, the cladding tube will be transparent at least for a desired wavelength range. The centering element or the holder can, however, also be used in conjunction with a non-transparent cladding tube, for example for packaging or transport purposes.

Further embodiments and some of the advantages associated with these and further embodiments will be made clearer and better understood from the following detailed description with reference to the accompanying figures. Objects or parts thereof that are essentially the same or similar can be provided with the same reference symbols. The figures are only a schematic representation of an embodiment of the invention.

Fig. 1

eine Draufsicht auf ein erfindungsgemäßes Zentrierelement mit Scheibengrund-körper,

Fig. 2

eine Seitenansicht des Zentrierelements aus Fig. 1,

Fig. 3

eine Seitenansicht eines erfindungsgemäßen Zentrierelements mit einem alter-nativen Scheibengrundkörper,

Fig. 4

eine Draufsicht auf eine weitere Ausführungsform eines erfindungsgemäßen Zentrierelements,

Fig. 5

eine Seitenschnittansicht durch den Scheibengrundkörper entsprechend Schnittlinie AA in Fig. 4,

Fig. 6

eine Untenansicht eines erfindungsgemäßen Zentrierelements mit Anschlusselementen und elektrischer Kontaktierung,

Fig. 7

eine Seitenschnittansicht durch den Scheibengrundkörper mit Anschlusselement in der axial-zentralen Bohrung entsprechend Schnittlinie AA in Fig. 6,

Fig. 8

eine Seitenansicht einer erfindungsgemäßen Halterung mit Zentrierelement in einem Hüllrohr,

Fig. 9

eine Draufsicht auf eine weitere Ausführungsform eines erfindungsgemäßen Zentrierelements mit einem alternativen Federelement,

Fig. 10

eine Draufsicht auf weitere Ausführungsformen eines erfindungsgemäßen Zentrierelements mit alternativen Federelementen.

Show:

Fig. 1

a top view of a centering element according to the invention with a disk base body,

Fig. 2

a side view of the centering element Fig. 1 ,

Fig. 3

a side view of a centering element according to the invention with an alternative disk base body,

Fig. 4

a plan view of a further embodiment of a centering element according to the invention,

Fig. 5

a side sectional view through the disk base body according to section line AA in Fig. 4 ,

Fig. 6

a bottom view of a centering element according to the invention with connection elements and electrical contacting,

Fig. 7

a side sectional view through the disk base body with connection element in the axially central bore corresponding to section line AA in FIG Fig. 6 ,

Fig. 8

a side view of a holder according to the invention with a centering element in a cladding tube,

Fig. 9

a plan view of a further embodiment of a centering element according to the invention with an alternative spring element,

Fig. 10

a plan view of further embodiments of a centering element according to the invention with alternative spring elements.

Figs. 1 and 2 show a simple embodiment of a centering element 1 according to the invention in top and side views. The circular disc base body 2 has in the central section 22 an axially central bore 4, which is used to attach a light source, not shown here, and in the offset edge section 21, the thickness of which is less than that of the central section 22, a plurality of axially parallel through-bores 23 through which a spring wire 3 is wound as an elastic spring element. The thickness of the edge section 21 is selected so that the turns of the wire winding 3 are not bent open when passing through the openings 23.

If the thickness of the disk body is sufficiently small for the selected wire winding, then, unlike in the figures, a stepped edge section is not required.

The wire ends of the circumferential wire winding 3 are connected to one another; Fig. 2 shows a connector 31 which clamps the two ends together. Alternatively, the wire ends can be connected in a different way, for example welded or just twisted against one another.

The embodiment of the centering element 1 in Fig. 3 differs from Fig. 2 in that the disk base body 2 has a base section 22 'around the axially central bore 4 in the manner of a hub. This can be manufactured in one piece with the disk base body 2, so that here the lamp base can at the same time be the disk base body of the centering element.

Depending on the type of connection element that is received in the axially central bore 4 or a lamp base to be received directly there, the axially central bore 4 can be a through bore, as in FIG Fig. 2 to see, or a blind hole, as in Fig. 3 indicated.

In both cases, the axially central bore 4 can have a thread or other form-locking elements (not shown) for screwing in or plugging in a lamp base or a connection element, which has a corresponding mating thread or mating form-locking element. The axially central bore 4 can, however, also be a simple cylindrical passage opening without thread or form-locking elements, so that a connection element inserted into the bore has to be fastened. Screw-nut connections are ideal for detachable fastening. But plug-in or forming solutions are also conceivable.

The same applies to the further bores 41 in the disk base body 2, which are shown in FIG Fig. 4 are shown. The further bores 41 - in the present case three, but they can also be fewer or more - are provided for the direct reception of a holding rod. The retaining linkage 9 is in Fig. 8 to see. However, it is also conceivable that the further bores 41 can have a connection element for the holding rod. The recesses 42, as in Fig. 5 Through bores shown or also only areas of reduced thickness (not shown) serve to reduce the weight of the disk base body 2, which is made from a ceramic. Ceramics such as the non-fired ceramic known for its reddish color can be used; or the gray fired ceramics. The advantage of fired ceramic is that it has a higher Has thermal shock resistance and dielectric strength; however, fired and unfired ceramics can be used.

In contrast to the quartz glass used in ceramics, which is also suitable, the ceramic has the advantage that it is resistant to temperature changes of up to 1,100 ° C, whereas that of quartz glass is up to approx. 600 ° C.

At lower temperatures (for example when using low-pressure lamps), disk base bodies made of metal, for example made of stainless steel or aluminum and other metals, can also be used.

The recesses 42 for weight reduction are preferably distributed uniformly, symmetrically. In contrast to what is shown, the recesses can also have cross-sectional shapes that differ from a circular shape in order to reduce weight.

Fig. 6 shows in a simplified manner the electrical contacting by means of contacting elements 8 between the threaded sections 9 'of a linkage 9 (cf. Fig. 8 ) in two opposite eccentric bores 41 and the fastening section 52 of the connection element 5 (cf. Fig. 7 ) for a lamp in the axially central hole 4.

The connection element 5 has a sleeve-like connection section 51 and a pin-like fastening section 52. The receiving opening 53 in the sleeve-like connection section 51 has for releasable electrical contacting and for releasable mechanical fastening of the lamp base 101 (cf. Fig. 8 ) fastening and contacting means 53, such as threads, spring wires or lamellar plates, on their inner circumferential surface. Preferably, 5 ODU Springtac® or ODU Lamtac® contact plugs from the connector systems of ODU GmbH & Co. KG, Mühldorf am Inn, DE, can be used as connection elements. The lamp base 101 is equipped with a corresponding counterpart that can be received in the sleeve-like connection section 51. In general, it is also conceivable that a connection section of a connection element is designed like a pin, so that the lamp base or the rod assembly is designed or equipped with a corresponding sleeve.

In the present examples, the fastening section 52, which extends through the axially central bore 4 or the eccentric bores 41, has an external thread, so that the connection element 5 can be secured to the disk base body 2 by means of a screw nut 6. A washer 7 usually comes to lie between the washer base body 2 and the screw nut 6 or the connection section 51. Furthermore, an electrical contact element 8 is connected to the connection element 5 by the screw nut 6.

The linkage 9 has a threaded section 9 ′ for fastening, which extends through the eccentric bores 41. Nuts 6 for fixing the rod 9 are shown on both sides of the centering element 1.

The electrical contact element 8 can, as in Fig. 8 is indicated, have an angled metal tab 82 with a wire end sleeve 81. The metal tab 82 surrounds the threaded section 9 ′ of the respective rod 9 in a contacting manner and is fastened with a further nut 6. One end of a wire strand (not shown) can be received in the wire end sleeve 81 and secured by crimping the wire end sleeve 81. The other end of the wire strand can also be accommodated in a corresponding wire end sleeve 81, which is fastened in a corresponding manner to the fastening section 52 of the connection element 5 for the illuminant 100 via a metal tab, so that an electrical contact is established between the rod assembly 9 and the illuminant 100 becomes. In this way, the power supply of the lighting means 100 is produced via the connection elements 5 and the rod 9, which also serves to hold the lighting means 100 in the cladding tube 10. To isolate the electrically conductive metal pipes of the rod assembly 9, they are surrounded by an insulator sleeve 91, which can be made of glass, for example.

The stranded wire, not shown, which makes the electrical contact, is encased by an insulator. B. short glass or ceramic sleeves in question. Of course, the electrical contact between the connection elements can also be established in a variant that deviates from the way shown here by way of example. Electrical contacting means for this purpose are known to the person skilled in the art.

Next is in Fig. 8 to see how the centering element 8 rests in the cladding tube 10 through the somewhat radially compressed elastic spring element 3 and thus ensures the centered arrangement of the illuminant 100. With uncompressed elastic spring element 3 the centering element 1 has a certain oversize compared to the inside diameter of the cladding tube 10. The disk base body 2, the diameter of which is smaller than the inside diameter of the cladding tube 10, is circumferentially spaced uniformly from the inner wall of the cladding tube 10 by the elastic spring element 3.

Since the centering element 1 allows axial displacement, thermal expansion effects can also be compensated, so that no stresses occur in the holder 9, the illuminant 100 and the cladding tube 10.

The cladding tubes suitably have a circular cross-section, and therefore the centering element also has a circular disk base body. However, it is equally conceivable that a lamp is to be arranged in a cladding tube with a non-circular, for example polygonal, cross-section, so that the disk base body will have a corresponding shape and correspondingly smaller dimensions to allow the elastic spring element on the inner wall of the shaped Cladding tube.

As an alternative to a wire winding, a layer 3 ″ of foam material can circumferentially surround the disk base body 2 of the centering element 1 as an elastic spring element, as in FIG Fig. 9 is shown. In this example, the disk base body 2 does not have a stepped edge section. However, the elastic spring element can also be a foam material layer in the case of a disk base body with a stepped edge section. Unlike in Fig. 9 As shown, the disk base body 2 with foam material layer 3 ″ as an elastic spring element can also have eccentric bores for receiving a linkage and / or recesses for weight reduction in addition to the axially central bore 4.

Whether a layer of foam material can be used as the elastic spring element depends on the type of light source, i. H. its emission spectrum and operating temperature, which is centered and maintained with the centering element.

While many materials can be used for the foam layer for lamps with a relatively low operating temperature and without UV emission, high-performance plastics at most can be used for other lamps, if at all. Exceeds the Operating temperature of the light source the continuous operating temperature of the plastic, metal wire is used for the elastic spring elements.

Suitable high-temperature and UV-stable plastics can, for example, polyetherimide, various fluoropolymers such. B. polytetrafluoroethylene or polyvinylidene fluoride, or polyphenylene sulfide.

Other plastics whose operating temperature is well above 200 ° C are, for example, polyether ketone, polyether ether ketone and polyether sulfone, but they are not resistant to UV radiation.

The use of UV stabilizers in such plastics may be considered. Suitable plastics must also be foamable.

The foam material can be attached, for example, by gluing, with the adhesive material also having to meet the requirements with regard to temperature and UV resistance. Alternatively, a foam material made of plastic can be sprayed on or drawn on. For this purpose, the disk base body can also have circumferential form-locking elements, e.g. B. a circumferential groove.

Fig. 10 shows a representation of two further variants of elastic spring elements for centering elements 1 according to the invention. As an alternative to a full-circumferential foam material layer 3 ″, which is shown in FIG Fig. 9 is shown, it can also be provided that the foam material layer 3 ″ is only present in sections distributed over the circumference of the disk base body 2.

The other alternative in Fig. 10 shows individual spring washers 3 ′ made of a flat wire or strip material, which are evenly distributed around the circumference of the disk base body 2. The spring rings 3 ′ can be accommodated in correspondingly slot-shaped recesses of the disk base body 2 close to the edge. It is not absolutely necessary for the recesses to be continuous and for the spring washers 3 'to be closed. It is just as well conceivable that a spring ring 3 'is perforated at one point. Thus, instead of through a continuous slot with both ring ends, the ring can engage in corresponding recesses on both sides of the disk base body 2, so that the spring ring 3 ′ clamps on the disk base body 2.

Round wire is less suitable for spring washers of this type, since they can give way in the event of radial loading if they are only received in a correspondingly round recess in the disk base body.

An advantage of the wire winding or the spring washers over other forms of a spring element made of metal wire is that scratches are avoided or greatly minimized by the rounded contact surface of the springs on the glass of the cladding tube. In addition, these spring elements allow shielding gas to pass between the disk body and the cladding tube, if shielding gas is provided for the illuminant in the cladding tube. The permeability for protective gas is improved by the openings, which are also provided for weight reduction.

In general, the spring element enables tolerance compensation in the cladding tubes, in particular in the case of attachment points, out-of-roundness and changes in wall thickness, so that the centering element, which holds the illuminant and centers it in the cladding tube, is always in contact. Any vibrations that may occur are dampened by the spring element, which also allows the centering element to slide in the event of thermal expansion of the linkage in the cladding tube. In the case of the preferred centering element with a disc base body made of ceramic and a spring element made of metal, which is stable even at very high temperatures, there is also no outgassing of foreign substances that could react or lead to contamination.

REFERENCE LIST

1

Centering element

10

Cladding tube

100

Illuminant

101

base

2

Disc body

21

stepped edge section

22nd

Central section

22 '

Base section

23

Passage openings

3

Spring element, wire winding

3 '

Spring element, spring body flat thrust ring

3 "

Spring element, foam layer

31

Interconnects

4th

axially central bore

41

eccentric hole for linkage

42

Recesses for weight reduction

5

Connection element

51

Connection section / sleeve

52

Fixing section / spigot

53

Receiving opening

54

Fastening and contacting means / thread, spring wires, lamellar sheet

6th

mother

7th

Washer

8th

Contact element

81

End sleeve

82

Metal tab

9

Linkage

9 '

Threaded section

91

insulator

Claims (10)

1. A centring element (1) for holding a lighting means (100) in a centring manner in a jacket tube (10), wherein the centring element (1) has an axially central bore (4) and at least one elastic spring element (3, 3', 3"), which extends at least in some sections on an outer circumference of the centring element (1) and provides a radial restoring force,
   characterised in that
   the centring element (1) has a base disk body (2), in which the axially central bore (4) is present and the diameter of which is smaller than an inner diameter of the jacket tube (10), wherein
   the spring element (3, 3', 3") is provided

   - by a spring body (3') or a resilient winding (3) made of wire, which is guided through a plurality of axially parallel openings (23) at the edge of the base disk body (2), or

   - by a layer (3") made of a foam material, which is light-/UV-, and/or heat-resistant as a function of a type of the lighting means (100) to be centred.
2. The centring element (1) according to claim 1,
   characterised in that
   the wire is a round or flat wire made of plastic or metal, wherein the plastic is light-/UV-, and/or heat-resistant as a function of a type of the lighting means (100) to be centred.
3. The centring element (1) according to claim 1 or 2,
   characterised in that
   with respect to the inner diameter of the jacket tube (10), the elastic spring element (3, 3', 3") has a certain excess, which is a function of a spring rate of the spring element (3, 3', 3"), wherein the excess is selected such that a pressure, which can be exerted on the inner wall of the jacket tube (10) by means of the radial restoring force, corresponds to a predetermined pressure.
4. The centring element (1) according to at least any one of claims 1 to 3,
   characterised in that
   the axially central bore (4) is formed to receive a base (101) or to receive a connecting element (5), which is fastened to the base disk body (2) so as to be releasable in one or more parts, wherein the connecting element (5) is a fastening and contact device for the releasable mechanical fastening and for the releasable electrical contacting of the base (101) of the lighting means (100).
5. The centring element (1) according to at least any one of claims 1 to 4,
   characterised in that
   the base disk body (2) has at least one eccentric bore (41), which is formed to receive a rodding (9) or to receive a connecting element for the rodding (9), wherein the connecting element is fastened to the base disk body (2) so as to be releasable in one or more parts, wherein the connecting element provides a releasable mechanical fastening and a releasable electrical contacting of the rodding (9).
6. The centring element (1) according to claim 5,
   characterised in that
   an electrical bridge element (8) is arranged between the connecting element of the eccentric bore (41) and the connecting element (5) of the axially central bore (4).
7. The centring element (1) according to claim 5 or 6,
   characterised in that
   at least two eccentric bores (41) are present, which are preferably located symmetrically to the axially central bore (4).
8. The centring element (1) according to at least any one of claims 1 to 7,
   characterised in that
   the base disk body (2) is made of a metallic material, in particular a stainless steel or aluminium, or of a ceramic material, or of quartz glass.
9. A lighting means holder,
   characterised in that
   the holder has a centring element (1) according to at least any one of claims 1 to 8, and at least one rodding (9), which is fastened to the centring element (1) in a mechanically releasable manner.
10. The lighting means holder according to claim 9,
    characterised in that
    the rodding (9) has metal pipes (9), which are each fastened in a mechanically releasable manner in one of the eccentric bores (41) of the centring element (1) and which are electrically contacted, wherein the metal pipes (9) are surrounded by an insulator jacket (91).

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