DE20112365U1 - Luminaire with a base part and a trough-shaped cover and base part for a luminaire - Google Patents

Abstract

A lighting unit (1) comprises a base (2) having a lamp holder and a trough-shaped cover (5) removably connected to the base. The unit has a screen (7) between the base and the base of the cover (5a) and this is quite transparent at least in the region of the screen. An Independent claim is also included for a base for the above having long sections to which end pieces are attached.

Description

July 27, 2001

Luminaire with a base part and a tub-shaped cover and base part

for a lamp

The invention relates to a lamp and a base part according to the preamble of claim 1, 7 or 11.

A lamp or base part of this type is known. The known lamp or base part is of elongated and rectangular design, which is formed by a substantially flat base part with means for fastening to a support, e.g. to a wall or ceiling, and a trough-shaped cover which is connected to the base part by means of detachable fastening elements. This previously known lamp fulfills a less demanding lighting purpose, e.g. in stairwells, cellars, damp rooms, garages, halls and the like. Since the cover is made of opal material, the known lamp is glare-free, which, however, somewhat impairs the utilization of the luminous power.

The invention is based on the object of improving the luminous efficiency of a luminaire of the type specified at the beginning.

This object is solved by the features of independent claims 1, 7 or 8. Advantageous developments of the invention are described in the subclaims.

In the luminaire according to claim 1, at least part of the bottom wall of the trough-shaped cover is made of clear, transparent material, with a grid arranged between the cover and the base part. The clear, transparent bottom wall enables greater radiation output, with the grid reducing glare from the luminaire. The room to be illuminated is therefore illuminated with a greater luminance with the luminaire according to the invention, with a person in the illuminated room remaining largely unaffected by the emitted light in terms of glare at a normal viewing angle. The luminaire according to the invention is therefore suitable for demanding lighting purposes, e.g. in living rooms, offices and the like, with a simple, small and inexpensive design. The invention is based on the finding that the trough-shaped cover is excellently suited to accommodating the grid if space is used well. The grid can rest against the bottom wall of the trough-shaped cover, which makes positioning the grid much easier.

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Within the scope of the invention, the side walls of the luminaire can extend parallel to its vertical center plane or convergently towards the base part. The latter design has the advantage that an increased light emission is achieved towards the mounting side of the luminaire. As a result, the area surrounding the luminaire on the mounting side, e.g. a ceiling, is illuminated more and the difference in brightness between the luminaire and its surroundings is reduced, which is also the aim in order to reduce lighting contrasts.

The object underlying the invention is also achieved by the embodiment according to claim 7. Advantageous further developments of the invention are described in the associated subclaims.

In the embodiment according to claim 7, the trough-shaped cover has, on its edge facing the base part, ceiling wall sections extending inwards from the side walls, opposite which laterally open recesses are arranged in the base part. In this embodiment, the radiating surface of the lamp is not only enlarged by the surface size of the recesses, so that more light is emitted, but the enlarged surface areas are also directed towards the mounting side, e.g. towards the ceiling. As a result, the area around the lamp in the area of the mounting side is illuminated more and consequently the advantages already mentioned with regard to the divergent side walls are achieved, to which reference is made in order to avoid repetition.

Further developments of the invention lead to simple, small and inexpensive designs, whereby the fastening of the grid and/or the trough-shaped cover is also improved. Further developments improve the luminaire in terms of light emission in the lateral area as well.

The invention is also based on the object of designing a base part in such a way that it is also suitable for improved lighting in its side areas or in the attachment side area.

This object is achieved by the features of claim 11. Advantageous developments of the invention are described in the associated subclaims.

To avoid repetition, the advantages achievable by the embodiment according to claim 11 are referred to the description of the advantages with regard to the

independent claim 7. Those advantages also apply to the embodiment according to claim 11.

Advantageous embodiments of the invention are explained in more detail below using preferred embodiments.

Fig. 1 shows a luminaire according to the invention in a perspective side view;

Fig. 2 the luminaire in vertical cross-section;
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Fig. 3 a base end part of a base part of the lamp in Fig. 1 in an enlarged perspective view from bottom left;

Fig. 4 a special detail of the base part in an enlarged view; 15

Fig. 5 shows a special detail of the base part in a modified design and in perspective view.

The main parts of the lamp, designated in its entirety by 1, are a sock-shaped base part 2 with simplified fastening means 3 for fastening the base part 2 to the attachment side 4 of an attachment body, e.g. a ceiling or a wall, a trough-shaped cover 5 which can be detachably connected to the base part 2 by fastening means 6 on the side of the base part 2 facing away from the attachment side 4, a grid 7 which is arranged between the base part 2 and the bottom wall 5a of the cover 5 and further fastening means 8, in particular formed by at least one plug-in socket, for holding and electrically connecting a centrally arranged lamp 9 or two lamps 9 arranged next to one another, as well as other conventional operating means for electrical power supply.

The preferably elongated lamp 1 has a substantially rectangular or square cross-sectional shape, whereby it also has the shape of a rectangular cuboid taking into account its end faces extending at right angles to the longitudinal central axis. The preferably flat side walls 5b and optionally also the preferably flat end walls 5c of the cover 5 can also extend convergently in the direction of the base part 2, as indicated in Fig. 2.

The base part 2 is U-shaped in longitudinal and cross-section with an annular projection 2a running all the way around on the side facing the cover 5, the cavity of this U-shape being designated 11.

In the embodiment, the base part 2 is a sheet metal part that can be formed in one piece. The cover 5 is pot-shaped with the bottom wall 5a and the side or end walls 5b, 5c, and it extends into the cavity 11 with an annular socket 12, whereby there is a play of movement between the annular socket 12 and the annular projection 2a to ensure assembly and disassembly. The cross-sectional shape of the annular socket 12 is adapted to the square cross-sectional shape of the annular projection 2a. The annular socket 12 is thus tapered with respect to the outer sides of the cover 5 by the amount of the thickness d of the annular projection 2a. In this tapered area, an annular ceiling wall section 5d extends in one piece from the associated side or end wall 5b, 5c to the annular wall 12a of the annular socket 12 on opposite sides, here the long sides (see Fig. 1), or over the entire circumference. The annular projection 2a is therefore opposite the ceiling wall section 5d. The fastening means 6 can be formed, for example, by locking devices 13 which are effective between the annular socket 12 and the annular projection 2a and can be formed by locking lugs 13a which are preferably fastened to the annular projection 2a and which each engage behind a locking projection 13b on the annular socket 12 with an elastic force. When the add-on part 5 is assembled by inserting it, the e.g. B. on spring arms arranged locking lugs 13a automatically extend and snap into place behind locking projections 13b, whereby the cover 5 is releasably fixed to the base part 2. The locking device 13 can preferably be released to release the cover 5 by a manually exerted pulling force on it, whereby the locking lugs 13a automatically give way. For secure fixing, two locking devices 13 arranged opposite one another and in the middle are sufficient. In the present elongated design, it is advantageous to provide two locking devices 13 arranged opposite one another in each end region.

The base part 2 formed from sheet metal has a ceiling wall section 2b which delimits the cavity 11 on the top side and inside and outside side wall sections 2c, 2d which are connected to one another in a box shape. The outer side wall section 2d projects beyond the ceiling wall section 2b towards the attachment side 4. A short flange section 2e can extend inwards from its free edge, whereby the side wall section 2d is stabilized. In the cavity 14 present between the free edge of the outer side wall section 2d and the ceiling wall section 2b, an indentation 2f of the ceiling wall section can be formed.

2b, whereby an upwardly enlarged free space 11 is created for electrical equipment and the like, e.g. a ballast 15, which is fastened from below to the ceiling wall section 2b - if necessary in the recess 2f - e.g. by means of screws (not shown).
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In the base part 2, a recess 16 is provided on at least one side, here on both long sides, which is open laterally and towards the cover 5 and in the exemplary embodiment is delimited by two angled wall sections 2h, 2i, of which the wall section 2h extends at or at a short distance from the inner side wall section 2c and thus has the distance a on the outside and the wall section 2i has the distance b from the front side of the ring projection 2a ceiling wall section 5d and in the exemplary embodiment is located approximately halfway up the base part 2. The distance a is preferably approximately 5 mm to 20 mm. A distance a of approximately 12 mm is particularly advantageous taking into account the given spatial conditions and external dimensions of the lamp 1. The distance b is preferably also at least approximately 5 mm and is in particular smaller than the height h of the base part 2, whereby the base part 2 takes on the shape of a stable base on the mounting side 4.

The grid 7 is a known construction with two opposing reflection side walls 17, which are arranged and shaped symmetrically with respect to a longitudinal center plane E directed at right angles to the mounting side 4, and with upright grid walls 18 extending transversely between them, which are connected to the reflection side walls 17 by fastening means 19 known per se, and whose height is less than the height of the reflection side walls 17, so that the at least one lamp 9 is arranged between the grid walls 18, which are spaced apart by a longitudinal distance c, and the upper edges of the reflection side walls 17. The grid 7 is preferably positioned or fixed to the cover 5. For a ceiling light, positioning - here in the middle - in the cover 5 is sufficient, since the grid 7 can rest against the base wall 5a due to gravity. For positioning in the middle, positioning arms 21 can be provided which protrude outwards from the lower edges of the reflective side walls 17 and extend to the side walls 5b. The length of the positioning arms 21 is dimensioned so large that the grid 7 can be inserted or removed from the tapered opening 5e of the cover 5 by tilting it. The positioning arms 21 can also be elastically bendable so that the grid can be inserted or removed in the tapered opening area. The grid 7 can also be attached to the cover 5, e.g. by gluing the lower edge area of the reflective side walls 17 to the base wall 5a, this edge area being separated by a lower, outwardly extending

a side wall leg 17a extending approximately parallel to the base wall 5a and a side wall leg 17b extending upwards from its outer edge. The positioning arms 21 can extend from the free edge of the side wall leg 17b to the associated side wall 5b, whereby they can bear against it with a lateral compressive stress, whereby a clamping device for positioning the grid 7 of the cover 5 is formed. With such or another fastening device for the grid 7 in the cover, the light 1 is also suitable for attachment rotated by approximately 90°, e.g. on a wall. The grid can be fastened in the cover 5 during prefabrication, so that the cover 5 and the grid 7 can be mounted together during assembly.

The base part 2 preferably consists of a profile section 22 extending over most of the longitudinal dimension and end parts 23 which are identical and/or arranged in mirror image to one another and which are connected to the associated end of the profile section 22 by connecting devices (not shown), e.g. by means of plug-in devices which can be plugged together along the profile. In the exemplary embodiment, the end parts 23 have end part legs 23a which protrude in the direction of the profile section 22 and which are connected to one another by an end part web 23b. The connecting devices between the end part legs 23a and the profile section 2 are not shown for reasons of simplification. In the area of the end parts 23, the cavity 11 and the annular socket 12 extend to the end part webs 23b, which can be dimensioned narrower than the end part legs 23b, as shown in Fig. 3.

The formation of the base part 2 from the longitudinal section 22 and the end parts 23 is advantageous for several reasons. Firstly, it is possible to form or prefabricate the longitudinal section 22 as a profile, e.g. as an extruded profile or as a sheet metal profile that can be bent or rolled or formed in one pass. This enables simple and inexpensive production for the longitudinal section 22. This can therefore consist of plastic or metal sheet such as sheet steel or aluminum sheet, for example. In the exemplary embodiment, the recesses 16 only extend in the area of the longitudinal section 22, i.e. the recesses 16 are not present in the end parts 23.

A further advantage is that several longitudinal sections 22 can be stacked, as shown in Fig. 4. In the prefabrication area, several or a large number of longitudinal sections 22 can thus be stored with reduced space requirements and can therefore also be transported inexpensively.

Fig. 5 shows an equally advantageous alternative for the base part 2 and/or the longitudinal section 22. In this embodiment, the ceiling wall 2b is connected to the flange section 2e by a connecting leg 2j, which extends vertically, for example, to form a box shape. The inner side wall section 2c, however, is missing, with an inner leg 2k extending inwards from the wall section 2h, e.g. in a U-shape, in the exemplary embodiment.

Stackability is ensured for both profile shapes because the distance a, taking into account a movement play, is larger than the dimension of the flange section 2e in the embodiment according to Figs. 2 and 4 or the dimension e of the upwardly pointing base ring 24. The end parts 23 can also be designed in the embodiment according to Fig. 5, as described above.

The base wall 5a of the cover 5 consists of a clear, translucent material such as glass or plastic, at least in the area of the reflector 7a formed by a grid 7 in the present embodiment, or in the entire base wall area. As a result, the lamp 1 emits light with a high luminance in the main radiation direction indicated by the arrow 25, which is directed transversely to the base wall 5a. The side walls 5b can consist of a clear, transparent or translucent (opal) material. In both cases, the lamp 1 or the cover 5 is thus suitable for emitting side light, shown in simplified form by the arrow 26, which is formed from light rays that extend from the at least one lamp 9 through the distance f extending between the upper edges of the reflection side walls 17 into the space above the reflector 7a and reach the outside laterally from the free space 27 located above it. A reflection of these light rays on the inside of the ceiling wall 2b can contribute to this, the inside of which is preferably designed as a reflection surface. In this case, a portion 26a of the side light is also emitted obliquely upwards through the ceiling wall sections 5e, which contributes to further illumination of the lateral surroundings of the lamp 1, in particular in the area of the mounting side 4. The side walls 5b, including the base wall sections 5al located outside the reflector 7a and the ceiling wall sections 5d, can also consist of clear, transparent or translucent (opal) material.

The luminaire 1 can be specified by emitting colored side light 26 and adapted to special needs and room furnishings. The step-shaped shoulder with which the cover 5 is attached to the base part 2, here the ring socket wall 12a and/or the ceiling wall sections 5d, can be colored.

Another embodiment for generating colored side light 26 or 26a can be generated by arranging a color filter 28 extending transversely to the side light 26 in the cavity 5e. The color filter 28 can be formed, for example, by a film made of preferably rigid material that extends diagonally between the upper edge region of the reflection side walls 17 and the corner region of the cavity 11 and colors the side light 26. To ensure a positive fit of the color filter 28, a small transverse leg (not shown) can be formed on the upper edge of the reflection side walls 17, which ensures a positive fit in conjunction with the corner region of the cavity 11.

The color of the side light 26 or 26a can be, for example, green, blue, yellow or red.

The luminaire 1 thus emits directed light 25 downwards and side light 26 or 26a of the same or white color or colored light to the side in order to illuminate the surroundings and the area of the mounting side.

Claims (12)

1. Lamp ( 1 ) with a base part ( 2 ) which carries at least one socket for at least one lamp ( 9 ), and with a trough-shaped cover ( 5 ) which is connected to the base part ( 2 ) by detachable fastening means ( 6 ), characterized in that the lamp ( 1 ) has a grid ( 7 ) between the base part ( 2 ) and the bottom wall ( 5a ) of the cover ( 5 ) and the bottom wall ( 5a ) is clearly transparent at least in the region of the grid ( 7 ). 2. Luminaire according to claim 1, characterized in that the grid ( 7 ) is positioned or fixed on the cover ( 5 ). 3. Luminaire according to claim 1 or 2, characterized in that the grid ( 7 ) rests against the base wall ( 5a ). 4. Luminaire according to claim 2 or 3, characterized in that the grid ( 7 ) is positioned or fixed on the bottom wall ( 5a ) or the side walls ( 5b ) of the cover ( 5 ). 5. Luminaire according to one of the preceding claims, characterized in that the side walls ( 5b ) of the cover ( 5 ) are clearly transparent or translucent (opal). 6. Luminaire according to one of the preceding claims, characterized in that the preferably flat side walls ( 5b ) of the cover ( 5 ) are convergent in their direction facing away from the base wall ( 5a ). 7. Lamp ( 1 ) with a base part ( 2 ) which carries at least one socket for at least one lamp ( 9 ) and with a trough-shaped cover ( 5 ) which is connected to the base part ( 2 ) by detachable fastening means ( 6 ), or lamp according to one of the preceding claims, characterized in that the cover ( 5 ) has a connection opening ( 5e ) which is reduced in width, towards the edge of which ceiling wall sections ( 5d) extend inwards from the side walls (5a ) , and the base part ( 2 ) has a laterally open recess ( 16 ) opposite the ceiling wall sections ( 5d ). 8. Lamp according to claim 7, characterized in that the lamp ( 1 ) is an elongated lamp. 9. Luminaire according to claim 7 or 8, characterized in that the base part ( 2 ) consists of a longitudinal section ( 22 ) and end parts ( 23 ) arranged at two opposite ends of the longitudinal section ( 22 ). 10. Luminaire according to one of the preceding claims, characterized in that the recesses ( 16 ) extend over the entire length or end at a distance from the ends or extend only in the longitudinal section ( 22 ). 11. Base part ( 2 ) for a lamp ( 1 ), in particular according to one of the preceding claims, with fastening means ( 3 ) arranged on one side of the base part ( 2 ) for fastening to an attachment side ( 4 ) of a lamp carrier and fastening means ( 6 ) arranged on its opposite side for detachably fastening a cover ( 5 ) for at least one lamp ( 9 ), characterized in that the base part ( 2 ) has a longitudinal section ( 22 ) and end parts ( 23 ) arranged at two opposite ends of the longitudinal section ( 22 ), and that the longitudinal section ( 22 ) has recesses ( 16 ) on its longitudinal sides extending between the end parts ( 23 ), which are open towards the side of the base part ( 2 ) to which the cover ( 5 ) can be fastened. 12. Luminaire or base part according to one of claims 9 to 11, characterized in that the longitudinal section ( 22 ) is a profile section.