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(11) | EP 1 156 269 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
Filter-holding connection for lighting devices Filter-Haltevorrichtung für Beleuchtungseinrichtungen Dispositif de mantien d'un filtre pour luminaires |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] The present invention refers to the field of lighting devices and, in particular, to a filter-holding connection for a device which makes use of a lamp of the HMG type in accordance with ILCOS classification.
[0002] Lighting devices are known that make use of lamps in which a substantially hemispherical anti-glare capsule is mounted over a light source, placed in the middle of a reflector. Two radial support lugs, ends of which are connected to the reflector, extend from two respective opposite generatrices of the capsule. Namely, the above-mentioned HMG lamps correspond to such configuration, as can be seen in document DE 35 43 087 A.
[0003] In the devices provided with such lamps, the problem frequently occurs of applying an optical filter, consisting of a disk, made of glass with filtering properties which can be chosen according to the specific requirements. In this regard, a first requirement is that the connection system between the filter and the lamp should be universal, i.e. not depending on the characteristics of the device on which the lamp itself is mounted. Another requirement is that said system must not cause shadows or photometric disturbances.
[0004] The object of the present invention is to meet these requirements by providing a filter-holding connection for lighting devices making use of lamps of the above-mentioned type, which is absolutely universal and does not generate any kind of significant disturbances to the lighting functionality of the device.
[0005] According to the present invention, this object is achieved with a filter-holding connection for a lighting device making use of a lamp in which a substantially hemispherical anti-glare capsule is mounted over the relevant lighting source. The connection comprises a plate, to be applied on a flat face of the filter., and a plurality of tongues projecting from the edge of the plate, for elastically gripping the hemispherical capsule of the lamp.
[0006] The characteristics and advantages of the filter-holding connection for lighting devices according to the present invention will be made clearer hereinafter with the following description of an embodiment thereof, made as an example but not limitative, referring to the attached drawing in which:
- figure 1 is a perspective exploded view of a lamp provided with the filter-holding connection according to the invention.
[0007] Referring to said figure, a lamp 1, of the known type described in the introductory part, comprises a lighting source 4 mounted in the middle of the concave side of a paraboloid-shaped reflector 2, on the opposite side of which means 3 are provided for fixing the lamp to the related lighting device, not shown. A substantially hemispheric anti-glare capsule 5 is mounted over a lighting source 4, supported by two lugs 6 radially extending between reflector 2 and respective opposite generatrices of capsule 5 itself.
[0008] An optical filter to be connected to lamp 1 simply consists of a disk 11, made of glass having suitable properties, which, according to the present invention, is applied by means of a reversible connection 7. Connection 7 comprises a plate 8, in the example substantially round, and with a diameter which corresponds to the width of capsule 5.
[0009] Plate 8 is centrally connected to a face of disk 11. To this purpose, a hole 10 is formed in the middle of plate 8. Hole 10 has a small peripheral rim, not visibile, which extends axially and is inserted in a central hole 12 formed in disk 11. Hole 10 is screwed for coupling with a pin 13b of a mushroom-shaped locking member 13 comprising also a disk-shaped head 13a. Thus, locking member 13 is fitted by inserting pin 13b within hole 12 from the side opposite to that of plate 8, and then screwing the pin itself within hole 10 until head 13a abuts against disk 11. Thus, plate 8 is fixed on the opposite side of disk 11 itself.
[0010] A plurality of tongues 9 extend axially from the edge of plate 8 (taking the central axis both of lamp 1 and of disk 11 as a reference). Preferably four tongues 9 are provided, as shown in the example, equally spaced along the periphery of plate 8. Tongues 9 are slightly converging towards the inner part of plate 8, but the respective ends 9b thereof are bent outwards.
[0011] In use, disk 11 with connection 7 mounted as in the above description, is moved towards lamp 1, in order to make inwards faces of ends 9b of tongues 9 contact with capsule 5. Upon exertion of a relatively small axial pressure on disk 11, tongues 9 slide on the outer part of capsule 5 and, at the same time, bend elastically outwards.
[0012] This step ends as plate 8 abuts against the top part of capsule 5. In this condition, ends 9a of tongues 9 elastically urge upon the outside of capsule 5, thus assuring a steady engagement between connection 7 and capsule 5 itself and, therefore, between filtering disk 11 and lamp 1. In order to make the abutment position more steady and precise, a tubular socket 14 can be used, as shown in the example, axially extending from plate 8 in the same direction of tongues 9.
[0013] Therefore, bent ends 9a of tongues 9 assist the insertion of connection 7. Preferably, tongues 9 extend integrally from plate 8, thereby the connection is obtained simply by buckling a single flat element, properly shaped, made of sheet metal or other material having suitable characteristics.
[0014] From what described above, it will be apparent that the connection according to the present invention is an actually universal one, as it co-operates only with capsule 5 and, on the other hand, it is not bound in any way by the characteristics of the device on which the lamp is mounted. Furthermore, the connection cannot cause any shadow or photometric disturbance, as it is placed in the shielded zone (that is, not involved by the light radiation) of capsule 5.
1. A filter-holding connection for a lighting device making use of a lamp (1) provided
with a substantially hemispherical anti-glare capsule (5) which is mounted over a
relative light source (4), characterized in that the filter-holding connection comprises a plate (8), suitable to be applied on a
flat face of a filter (11), and a plurality of tongues (9) projecting from the edge
of said plate (8), for elastically gripping said anti-glare capsule (5).
2. The connection according to claim 1, in which said tongues (9) extend integrally from
said plate (8).
3. The connection according to any of the previous claims, in which said tongues are
slightly converging towards the central part of said plate (8) and comprise respective
ends (9a) for gripping said anti-glare capsule (5), bent outwards in order to assist
the insertion on said anti-glare capsule (5).
4. The connection according to any of the previous claims, in which said plate (8) is
round, four tongues (9) being provided, equally spaced along the periphery of said
plate (8).
1. Filterhalteverbindung für eine Beleuchtungsvorrichtung, die eine Lampe (1) verwendet,
die mit einer im wesentlichen hemispärischen anti-blend Kapsel (5) versehen ist, die
über einer relativen Lichtquelle (4) montiert ist, da durch gekennzeichnet, dass die Filterhalteverbindung eine Platte (8) enthält, die geeignet ist, um auf
einer flache: Seite eines Filters (11) aufgebracht zu werden, und eine Mehrzahl von
Zungen (9) enthält, die vom Rand der Platte (8) vorstehen, um die anti-blend Kapsel
(5) elastisch zu greifen.
2. Verbindung nach Anspruch 1, bei welcher sich die Zungen (9) integral von der Platte
(8) erstrecken.
3. Verbindung nach einem der vorhergehenden Ansprüche, bei welcher die Zungen leicht
zum Zentralteil der Platte (8) konvergieren und sich jeweilige Enden (9a) zum Greifen
der anti-blend Kapsel (5) auswärts biegen, um das Einsetzen der anti-blend Kapsel
(5) zu unterstützen.
4. Verbindung nach einem der vorhergehenden Ansprüche, bei welcher die Platte (8) rund
ist, wobei vier Zungen (9) gleich beabstandet längs des Umfangs der Platte (8) vorgesehen
sind.
1. Un dispositif de raccordement d'un support de filtre pour un luminaire utilisant une
lampe (1) équipée d'une capsule anti-éblouissement sensiblement hémisphérique (5)
montée au-dessus d'une source lumineuse correspondante (4), caractérisé en ce que le dispositif de raccordement d'un support de filtre comporte une plaque (8), apte
à être appliquée sur une face plane d'un filtre (11), et une pluralité de languettes
(9) s'étendant à partir du bord de ladite plaque (8), pour agripper élastiquement
ladite capsule anti-éblouissement (5).
2. Le dispositif de raccordement selon la revendication 1, dans lequel lesdites languettes
(9) font partie intégrante de ladite plaque (8).
3. Le dispositif de raccordement selon l'une quelconque des revendications précédentes,
dans lequel lesdites languettes convergent légèrement vers la partie centrale de ladite
plaque (8) et comprennent respectivement des extrémités (9a) pour agripper ladite
capsule anti-éblouissement (5), pliées vers l'extérieur afin d'aider leur insertion
sur ladite capsule anti-éblouissement (5).
4. Le dispositif de raccordement selon l'une quelconque des revendications précédentes,
dans lequel ladite plaque (8) est de forme circulaire et est munie de quatre languettes
(9) régulièrement réparties le long de la périphérie de ladite plaque (8).