Luminaire with support element or luminaire housing and cover that can be attached to it

Abstract

Luminaire (10) with an elongate support element (15) for holding a light source (18), and a likewise elongate cover (20) which is approximately U-shaped in cross-section and which is at least partially translucent and can be connected to the support element (15) in such a way that the cover (20) together with the support element (15) encloses an elongate interior of the luminaire which is closed off at both end faces by end caps (25, 45), characterized by that each of the two end caps (25, 45) is designed in two parts, with a first part (30, 50) which is connected to the carrier element (15) and a second part (35, 55) which is connected to the cover (20), wherein the two parts (30, 50, 35, 55) for connecting the cover (20) to the support element (15) can be locked together without tools.

Description

The present invention relates to a luminaire which has a carrier element or a housing for holding a lighting means and optionally further electronic components, wherein the carrier element or luminaire housing can be coupled to a light-transmissive cover. In particular, the present invention relates to a luminaire in which the carrier element or the housing of the luminaire is intended to be fastened to a wall or ceiling.In the case of luminaires of the type described above, it is usually provided that, for mounting the luminaire, firstly the carrier element or the luminaire housing is fastened to the wall or ceiling of a space to be illuminated and the measures for electrically connecting the luminaire to external supply lines are carried out. Only in a final step is the cover responsible for the light emission then fastened to the carrier element or the housing in order to complete the assembly.FIGS. 18 and 19 show two solutions known from the prior art, wherein elongated lamps 200 are shown in each case, which have an elongated carrier element 210 to be fastened to a ceiling. This carrier element 210 is formed, for example, by a corresponding sheet metal part, on which, among other things, an operating device 215 recognizable in FIG. 19 is arranged, the task of which is to convert the externally provided supply voltage into a suitable voltage for operating the lighting means, not shown in more detail. In the case of lamps of the type shown, the lighting means will generally be an elongate arrangement of LEDs which are then supplied with a correspondingly suitable voltage by the operating device 215.In the case of both illustrated luminaires 200, therefore, as explained above, first the fastening of carrier element 210 to the ceiling of the space to be illuminated takes place. In this case, the electronic components, in particular the operating device 215, are freely accessible from the bottom side and the corresponding assembly work for connecting the operating device 215 to the power supply can be carried out without any problem.After completion of these works, a correspondingly suitable cover 220 or 230 is then fastened to the carrier element 210, which cover, together with the carrier element 210, then encloses the luminaire interior in which the operating device 215 and the further lighting means are located. For the final fastening of the cover 220 or 230, different solutions are known from the prior art, wherein as a rule mechanical latching connections are used. The lamps closed in this way can then be secured by screws, by means of which on the one hand a reliable mounting on the carrier element 210 is ensured and on the other hand it is prevented that the covers 220 and 230 can be removed by unauthorized persons without too much effort.In the solution shown in FIG. 18, the cover, which is approximately U-shaped in cross section, is provided with end parts 225, which each have two openings 226 at their upper end. These then allow the insertion of screws 227, with the aid of which the cover 220 is fixed to the carrier element 210.A comparable solution is provided in the luminaire according to FIG. 19. Here, the fastening of the cover 230 to the carrier element 210 takes place with the aid of a mechanically engaging mechanism which is secured by a total of two screws 237 which, in this case, are guided perpendicularly to the longitudinal direction of the luminaire 200 from the underside through a corresponding opening 236 in an end part 235 of the cover 230 and are then screwed to an end part 217 provided on the carrier element.These solutions known from the prior art have some problems.On the one hand, it is often only possible with difficulty, owing to the length of such a luminaire 200, to hold the cover 220 or 230 in a suitable position and then to fix it to the carrier element 210 with the aid of the screws 227, 237. In particular, two persons are often required for such works, which significantly increases the assembly effort. On the other hand, although the screw connections offer a certain degree of security in that the covers 220, 230 cannot be removed by unauthorized persons without too little effort, the screws 227, 237 that can be seen from the outside generally have a rather negative effect on the appearance of the luminaire 200.Otherwise, there is a comparable problem also in the case of luminaires in which, in particular, the cover and generally also the luminaire housing are configured rotationally symmetrically. Here too, the cover is fastened only after fastening the luminaire housing to the ceiling of a room, wherein this is in turn carried out either via screw connections or via a bayonet lock. With regard to the screw connection, the same disadvantages result as have already been explained above in connection with the lamps of FIGS. 18 and 19. The bayonet locking, on the other hand, is problematic with regard to the supply of the external power supply lines and the configuration of the luminaire housing. In the case of rotationally symmetrical luminaires of this type, it is namely usually desired for the luminaire housing to extend at the edge as far as the ceiling in order to form a clean termination. Furthermore, it is frequently desired to apply a clean-up of the feed line which cannot be matched to the above-mentioned criteria in the case of a bayonet closure. If the above-mentioned bayonet lock is used for the cover, then either a cover must be subsequently attached, which then extends as far as the ceiling of the room, or this cover is dispensed with. However, the subsequent attachment of the cover in turn leads to increased assembly effort and possibly likewise impairs the appearance of the luminaire. Dispensing with the cover in turn leads to the problem that the luminaire can be gripped more easily by unauthorized persons and can be removed from the ceiling by force, if necessary.The object of the present invention is accordingly to offer improved solutions here which, on the one hand, lead to an improved appearance of the luminaire and, on the other hand, ensure that opening of the luminaire, that is to say removal of the cover from the carrier element or the luminaire housing, cannot be effected with little outlay.The object is achieved by means of luminaires having the features of the independent claims. Advantageous further developments of the invention are the subject of the dependent claims.According to a first aspect of the present invention, a luminaire is proposed having an elongate carrier element for holding a lighting means and a likewise elongate cover which is of U-shaped configuration in cross section and is formed at least partially transparent to light and can be connected to the carrier element in such a way that the cover together with the carrier element encloses an elongate luminaire interior which is closed off at the two end faces by end caps, wherein, according to the invention, each of the two end caps is of two-part design, having a first part which is connected to the carrier element and a second part which is connected to the cover.The two parts for connecting the cover to the carrier element can be latched to one another without tools.According to the present invention, therefore, a screw connection for fastening the cover to the carrier element of the luminaire is dispensed with. Instead, a snap-in connection is used, wherein the cover is not snapped directly to the carrier element, but instead the end caps are each divided into two parts, which are then each connected to a component (carrier element or cover), wherein a joining together of the two end cap parts automatically leads to the desired connection of the cover to the carrier element of the luminaire. On the one hand, this solution can reduce the effort for mounting the luminaire, and on the other hand, there are no screw connections that negatively impair the appearance of the luminaire. Furthermore, the locking connection between the two end cap parts can be designed in a particularly advantageous manner such that it can be released again only with the aid of a tool, so that, in the same manner as in the screw connections known from the prior art, at least a certain obstacle exists for unauthorized persons to remove the cover from the carrier element again without using corresponding auxiliary means and thus to open the luminaire. These additional measures are then the subject matter of dependent claims.In this case, according to an advantageous embodiment of the invention, it is provided that the first part of an end cap is substantially plate-like and the second part forms an approximately U-shaped frame which, in the connected state, laterally encloses the first part. This measure in turn leads to simplified assembly of the luminaire, since during the production of the connection between the carrier element and the cover, the first part of the end cap is guided through the second part during the assemblyThe latching connection provided according to the invention can be realized, for example, in that the first part has a latching projection facing the second part, which latching projection interacts with a latching hook provided on the second part, wherein the latching projection can preferably be of approximately S- or Z-shaped design. In this case, the second part can then have a recess in the region of the latching hook, which recess allows the insertion of a narrow tool, for example a screwdriver for deflecting the latching projection, in order to release the latching between the first part and the second part of the end cap again.A slightly modified form for realizing the latching connection can consist in the second part having an outwardly pointing latching hook which, in the latched state, engages behind projections provided on a wall region of the first part. In this case, the second part can then have a recess in the region of the latching hook, which recess in turn enables the insertion of a narrow tool for deflecting the latching hook in order to release the latching between the first part and the second part of the end cap again. In both variants it is thus ensured that the latching connection for opening the luminaire can be released only with the aid of a suitable tool.According to a second aspect of the present invention, a luminaire having a luminaire housing in which lighting means are arranged is furthermore proposed, wherein the luminaire housing forms a light emission opening and wherein the luminaire furthermore has a cover which closes the light emission opening and is formed to be at least partially transparent, wherein the cover can be latched to the luminaire housing without a tool in such a way that the latching can be released again only with the aid of a tool.In this case, too, a screw connection between the luminaire housing and the cover is therefore dispensed with and the luminaire can be closed in a simple manner without tools by the cover being attached to the luminaire housing and latched thereto. By contrast, releasing the latching is in turn possible only with the aid of a tool, so that, analogously to the inventive idea described above, the appearance of the luminaire is again improved and at the same time sufficient protection against unauthorized opening of the luminaire is achieved.In this case, it can be provided in particular that the cover-and particularly preferably also the luminaire housing-is configured rotationally symmetrically and has a circumferential edge region which engages in a corresponding channel of the luminaire housing, wherein interacting latching means are configured on the edge region of the cover and on side walls of the channel of the luminaire housing. In particular, the edge region of the cover can have latching projections pointing outwards or inwards, wherein the side wall of the channel of the luminaire housing facing the latching projections then has corresponding openings or recesses, in which the latching projections engage in the fastened state of the cover on the luminaire housing. Alternatively, it can also be provided that the side wall of the channel of the luminaire housing facing the latching projections has a circumferential groove or recess, in which the latching projections engage in the fastened state of the cover on the luminaire housing. In both cases, therefore, in the fastened state of the cover on the luminaire housing, the actual latching connection is not visible or can hardly be seen from the outside and can in turn only be released by inserting a narrow tool, for example a screwdriver, into the channel in order to push the latching projections of the cover out of the associated groove or recess.A seal can be arranged in the base region of the channel of the luminaire housing, wherein the edge region of the cover dips into the seal in the state locked to the luminaire housing. As a result, the interior of the luminaire is protected at least to a certain extent from external influences, for example the penetration of dust, insects or other dirt particles.An advantage of the solution according to the invention is also that the luminaire housing can be configured in a simple manner in such a way that the edge region of the housing adjoining the channel forms a panel which extends substantially closed as far as a plane defined by the rear side of the luminaire housing. In the mounted state of the luminaire housing on a ceiling of a room, the panel then extends as far as the ceiling, so that the above-described problem is hereby avoided that persons can easily grasp the luminaire housing and can forcibly tear it off from the ceiling.The solutions according to the invention thus lead to an improved appearance of corresponding lamps, while at the same time facilitating their assembly. In spite of this, the lamps are protected from vandalism at least to a certain extent.The invention will be explained in more detail below with reference to the attached drawings. The following are shown: FIG. 1 shows the front region of a first exemplary embodiment of an elongate luminaire designed according to the invention, in which the end cap is formed by two parts which can be locked to one another; FIG. 2 is a partial section of the end portion of the luminaire of FIG. 1 ; FIG. 2a is a representation of the locking between the two end cap parts; FIG. 3 is an end view of the luminaire of FIG. 1 ; FIGS. 4 and 5 are views of a second exemplary embodiment of an elongate luminaire configured according to the invention, FIG. 6 shows a sectional illustration of the luminaire of FIGS. 4 and 5 ; FIG. 7 is an enlarged view of a part of FIG. 6 ; FIG. 8 shows a third exemplary embodiment of an end cap for an elongate luminaire configured according to the invention; FIG. 9 shows the rear side of the end cap according to the third exemplary embodiment; FIG. 10 shows the first end cap part of the third exemplary embodiment; FIG. 11 shows the second end cap part of the third exemplary embodiment; FIGS. 12 and 13 show the process of joining the two end cap parts according to the third exemplary embodiment; FIG. 14 shows a partial section of a rotationally symmetrical luminaire configured according to the invention; FIGS. 15 aand 15 bschematically illustrate the process of assembling the lamp housing with the cover in the embodiment of FIG. 14 ; FIG. 16 shows the rear side of the luminaire housing of the exemplary embodiment according to FIG. 14 ; FIG. 17 shows the front side of the luminaire according to the fourth exemplary embodiment, and FIGS. 18 and 19 show elongate lamps known from the prior art.As a first exemplary embodiment of a luminaire according to the invention, FIGS. 1 to 3 each show the front view of an elongate luminaire 10, which is very similar to the luminaires of FIGS. 18 and 19 with regard to its basic structure. The luminaire according to the invention therefore also has, first of all, a carrier element 15 which can be seen in FIG. 2 and which, in a first step, is to be mounted on the ceiling of a space to be illuminated and carries the essential electronic components of the luminaire 10. These can be, in particular, correspondingly designed lighting means and operating means for operating the lighting means. The carrier element 15, which extends along the longitudinal axis L of the luminaire, is formed, for example, by a correspondingly stamped and shaped sheet metal part which has suitable measures for fastening the luminaire 10 to the ceiling. For example, a keyhole-like opening 16 that can be seen in FIG. 2 can be provided, with the aid of which a screw fastening of the carrier element 10 is made possible.The corresponding electronic components, in particular connection terminals and operating means, are not shown in the figures. It is essential that these are placed on the carrier element 15 in such a way that, after it has been fastened to the ceiling, assembly work for connecting these components to an external power supply can be carried out in a simple manner. As a rule, an elongate LED board is then used as the lighting means, which is positioned with the aid of corresponding measures at a distance from the plane of the carrier element 15, wherein sufficient space is then available between the carrier element 15 and the board for receiving the further components or, if appropriate, LED board and further components are arranged one behind the other in the longitudinal direction.The actual light emission of the luminaire 10 takes place via a dome-like cover 20 which is approximately U-shaped in cross section and which, depending on the type of desired light emission, is formed partly or completely from a light-transmissive material. Depending on the desired light emission properties, the material of the cover 20 can be diffusely scattering in the region provided for light emission or else clear and correspondingly structured in order to influence the light emission in the desired manner. Together with the carrier element 15, the cover 20 then encloses the luminaire interior space, in which all the essential components of the luminaire 10 are accommodated. This interior is closed off at the longitudinal ends of the luminaire 10 by end caps 25 in each case, so that the luminaire interior is protected from the penetration of dust or dirt particles or insects.According to the invention, it is now provided that the end caps 25 are embodied in two parts, wherein the two end cap parts provided with the reference numerals 30 and 35 can be releasably locked to one another. In this case, the first end cap part 30 is fastened or firmly connected to the carrier element 15, for example via a screw connection, while, on the other hand, the second end cap part 35 is connected to the cover 20. As can be seen in FIG. 2, the second end cap part 35 can have a part-ring-like receptacle 36 facing the cover 20, into which receptacle the end region of the cover 20 is inserted in a positive-locking manner. This achieves the required attachment of the second end cap portion 35 to the cover 20.Joining together the two end cap parts 30 and 35 thus ultimately leads to the cover 20 being fastened to the carrier element 15, which obviously leads to very simple installation of the luminaire 10 overall, since the provided latching mechanism makes it possible to dispense with additional screw connections. In addition, this solution also has a positive effect on the appearance of the luminaire 10, since, in comparison with the solutions of FIGS. 18 and 19, no screws can be seen from the outside, which optionally have to be subsequently covered by corresponding screens.However, the solution according to the invention not only leads to simplified assembly and a better appearance of the luminaire 10, but ensures, due to the special configuration of the latching connection of the two end cap parts 30 and 35 with one another, which is explained in more detail below, that the latter can only be released again with the aid of a correspondingly suitable auxiliary means. A simple, obstacle-free opening of the luminaire 10 by unauthorized persons is thereby avoided.For this purpose, the first end cap part 30, which, as already mentioned, is fixed to the carrier element 15, is approximately plate-like and has an approximately rectangular configuration slightly rounded at the corners, at least from the outside of the luminaire 10. The second end cap part 35 on the other hand forms, as seen from the end side, an approximately U-shaped frame which, in the assembled state of the end cap 25, completely encloses the first end cap part 30 with the exception of that side which faces the ceiling. The second end cap part 35 can be double-walled or designed in a comparable manner on its sides facing the first end cap part 30, such that a certain guidance is achieved when the second end cap part 35 is placed on the first end cap part 30 in the arrow direction shown in FIG. 2.In the completely joined state, the intended locking between the first end cap part 30 and the second end cap part 35 then takes place, wherein a locking projection 31 which is visible in FIG. 2 and in the sectional illustration in FIG. 2 aand is provided on the inner side of the first end cap part 30 is provided for this purpose. This latching projection 31 which is approximately S- or Z-shaped extends centrally on the upper side of the first end cap part 30 in the direction of the interior of the luminaire, wherein in the completely joined state it then interacts with a downwardly projecting latching hook 38 provided on the second end cap part 35. As already mentioned, the engagement takes place only in the completely joined state of the two end cap parts 30 and 35 so that a defined connection between the two components and thus a reliable fastening of the cover 20 to the carrier element 15 of the luminaire 10 takes place.Finally, for the final assembly of the luminaire, it is therefore only necessary to fit the cover 20 with the second end cap parts 35 fastened thereto to the first end cap parts 30 and then to push it together perpendicularly to the longitudinal direction L of the luminaire 10 until the above-explained latching between the two end cap parts 30 and 35 takes place. In this state, the cover 20 is reliably and definedly fastened to the carrier element 15.This latching can also be released again only with the aid of a suitable auxiliary means. For this purpose, it is provided that a narrow slot 39 is formed on the edge region of the second end cap part 35 in the region of the latching projection 31 of the first end cap part 30. The end region of a correspondingly suitable tool, for example a screwdriver, can be inserted into this slot 39, wherein the latching projection 31 can then be pressed slightly downward with the aid of this tool or the latching hook 38 can be deflected to the rear (that is to say to the right in FIG. 2 a) in order to release the latching between the two end cap parts 30 and 35. In two successive steps, the latching at both end faces of the luminaire 10 can be released in this case, with the result that the cover 20 can then be removed from the carrier element 10 in a simple manner and the luminaire 10 can therefore be opened.The above-described configuration of the two end cap parts 30 and 35, which can be formed, for example, by suitably suitable plastic parts, thus leads to simple, in particular tool-free, final assembly of the luminaire 10, wherein, however, the opening of the luminaire 10 must in turn take place with the aid of a correspondingly suitable tool.FIGS. 4 to 7 show a luminaire 10 according to a second exemplary embodiment, which is very similar to the variant of FIGS. 1 to 3. The same elements are accordingly provided with the same reference numerals here.This luminaire 10 also therefore initially has a carrier element 15 which extends along the longitudinal axis L and which is to be mounted on a wall or ceiling and serves for the mounting of, in particular, an operating device 17 and the lighting means (illustrated here by the LED board 18) extending along the luminaire 10. The lamp interior is enclosed by the carrier element 15 together with the cover 20, which is in turn dome-like, wherein the carrier element 15 on the one hand and the cover 20 on the other hand are each connected to associated end cap parts 30 and 35 which, in combination, form in each case one of the two end caps 25 which are provided at the longitudinal ends of the lamp 10. The fastening of the cover 20 to the second end cap part 35 takes place in an analogous manner in that the end region of the cover 20 is inserted into a corresponding channel 36 of the end cap part 35.The difference between the first and the second exemplary embodiment is primarily in respect of the configuration of the components responsible for the latching of the two end cap parts 30 and 35, which components are configured slightly differently in the case of the second exemplary embodiment and the shape of which can be seen in particular from the enlarged illustration of FIG. 7.Thus, the latching element 38 provided on the second end cap part 35 now has a vertical web 38 a, which is widened in its end region to form a latching nose 38 b, which forms a corresponding projection. The wall of the first end cap part 30 is formed at the end region facing the cover 20 with an angled projection 31, which in turn is S- or Z-shaped, and in particular forms a corresponding projection which can latch with the latching element 38 of the second end cap part 35.FIG. 7 shows both latching components 31 and 38 shortly before the mutual latching, i.e. before the second end cap part 35 with the cover 20 is pressed in the direction of the carrier element, not shown, in accordance with the arrow direction shown. Only in this state do the two latching elements 31, 38 then engage in one another in a suitable manner in order, analogously to the previously described procedure, to connect the two end cap parts 30 and 35 and thus the carrier element 15 and the cover 20 to one another.To release this connection, the recess 39 already mentioned above is again provided in the end region of the second end cap part 35, into which recess, for example, a screwdriver can be inserted in order to deflect the latching element 38 of the second end cap part 35 laterally (to the right in the illustration) and thereby release the latching. As soon as this has taken place, the cover at this end region of the luminaire can be removed from the carrier element.The third embodiment of the present invention, which is shown in Figures 8 to 13, is very similar to the first two embodiments and differs primarily with regard to the question of how the two end cap parts are locked together.Accordingly, only one end cap 45 is now shown, which in turn is formed from two end cap parts 50 and 55, which are connected on the one hand to the carrier element of the luminaire and on the other hand to the cover of the luminaire, wherein this can be effected in the same manner as has been explained with reference to FIGS. 1 to 3. Again, the first end cap part 50 is approximately plate-like and, in the assembled state, is surrounded in a frame-like manner by the second end cap part 55.The latching between the two end cap parts 50 and 55 now takes place primarily with the aid of a latching hook 57, which can be seen in FIGS. 11 to 13 and is arranged centrally on the upper transverse limb 56 of the second end cap part 55.The first end cap part 50 has an opening 52 (see FIG. 10 ) in the circumferential edge region at the corresponding upper end, which opening is bounded on its side facing the wall of the end cap part 50 by two small projections 53. If, in this case, the second end cap part 55 with the cover, which is in turn fastened thereto, is pushed onto the first end cap part 50, the latching hook 57 first engages into the opening 52 of the first end cap part 50 and is subsequently deflected in such a way that it snaps over these two projections 53.This priority can be seen in FIGS. 12 and 13, which show the two end cap parts 50 and 55 shortly before the final latching (FIG. 12 ) and in the latched state (FIG. 13 ) (it should be noted that in this case a wall provided on the second end cap part 55 has been removed in order to clarify the interaction of the components responsible for the latching). The latching hook 47, reinforced on the rear side by a vertical web, thus engages over the two projections 53 in the final assembled state, so that in turn a reliable connection between the two end cap parts 50 and 55 and thus ultimately between the cover and the luminaire housing is achieved.This locking is released again with the aid of a corresponding tool, which can be inserted into an opening 59 provided on the second end cap part 55 in such a way that the locking hook 57 is deflected slightly toward the rear side. In this case, the second end cap part 55 can then be removed from the first end cap part 50 and the cover can thus be removed.This results in the same advantages with regard to the appearance and the mounting of the luminaire as have been explained in connection with the first exemplary embodiment.A fourth exemplary embodiment according to the invention is shown in FIGS. 14 to 17, wherein this is again a ceiling add-on lamp 60, which is now, however, not elongate but is circular or rotationally symmetrical, wherein the rotational shape is not absolutely necessary. Analogously to the exemplary embodiments explained hitherto, the luminaire 60 is formed by a component carrying the electronic components and a lighting means, here the rotationally symmetrical luminaire housing 70, which is in principle of pot-like design and thus forms an emission opening which is closed by an at least partially light-transmissive cover 80. The same applies to the cover 80 as was explained in connection with the preceding exemplary embodiments. This is therefore an element which enables the light emission of the luminaire 60 and, depending on the desired light emission characteristic, can be formed from a scattering material and / or optionally has a certain structuring.This further luminaire 60 is also distinguished by the special procedure for attaching the cover 80 to the luminaire housing 70, wherein again no tool is required for this purpose and in particular no screw connection is provided. Instead, analogously to the preceding exemplary embodiments, the cover 80 is now locked directly to the luminaire housing 70, this being recognizable in particular in FIGS. 15 aand 15 b.FIG. 15 a shows a sectional illustration of a receiving channel 75 which extends in the form of a ring, in the present case in the form of a circular ring in the outer region of the luminaire housing 70 and is provided for receiving a corresponding edge region 85 of the cover 80. As can be seen in FIG. 14, the approximately dome-shaped cover 80 is surrounded at the edge by a circumferential web 85, which extends approximately perpendicularly to the mounting plane of the luminaire 60 in the direction of the luminaire housing 70.Distributed at a plurality of points, this web 85 has outwardly pointing latching projections 86, wherein openings or recesses 77 are provided in the associated side wall 76 of the channel 75 of the luminaire housing 70, which openings or recesses make it possible for this latching projection 86 to engage.Ideally, a number of openings or recesses 77 is provided which corresponds to the number of the latching projections 86 and whose extent in the circular direction slightly exceeds the extent of the projections 86. Markings provided on the luminaire housing 70 can serve here to facilitate an alignment of the projections 86 with respect to the recesses 77, so that the cover 80 can be easily oriented in the required alignment for latching to the housing 70.In principle, it would also be conceivable to realize a circumferential recess or groove instead of individual recesses 77, although this is associated with increased production complexity. The openings 77 preferably provided are simpler to realize in terms of production technology in comparison with this, but nevertheless do not impair the sealing of the luminaire 60, since these openings 77 are ideally formed in the side wall 76 of the channel 75 facing away from the interior of the luminaire housing 70.In order to close the luminaire housing 70 with the cover 80, the latter must therefore be placed on the luminaire housing 70 in the desired orientation and then pressed onto the latter, wherein the run-on slopes 87 provided on the underside of the projections 86 lead to the edge region 85 of the cover 80 being able to be inserted into the channel until the latching projections 86 are able to snap into the recesses 77. In this state, the lower end of the web 85 then dips into a seal 79 provided in the base region of the channel 75, so that a seal which is satisfactory for the present luminaire 60 is achieved.Once again, therefore, it is easily possible to close the luminaire housing, in particular without tools, by virtue of the fact that the cover 80 can be latched to the housing 70. By contrast, the latching can again be released only with the aid of a corresponding tool, wherein this tool is inserted into the channel 75, as indicated by the arrow in FIG. 15 b, in such a way that the corresponding side wall 76 and / or the web 85 are deflected in such a way that the latching between the projection 86 and the recess 77 is released accordingly. The cover can then be separated from the housing 70 in this region of the outer circumference, wherein removal of the cover 80 as a whole is made possible after all corresponding catches have been released. The number of individual catches used should accordingly not be too high, a value between 3 and 5 having proven to be ideal, depending on the dimensions of the luminaire 60.Once again, the same advantages result as have been explained in connection with the exemplary embodiments discussed above. A further advantage of the solution according to the invention is furthermore that-as can be seen in particular in FIG. 14-the luminaire housing 70 can be guided further outwards adjacent to the receiving channel 75, so that this forms a circumferential panel 78 which extends substantially closed as far as the plane of the rear side of the luminaire housing 70. In the state of the luminaire housing 70 fastened to a decker, this panel 78 therefore likewise extends as far as the ceiling, whereby it is prevented that the housing 70 can be gripped easily by unauthorized persons and can be removed from the ceiling with force. This screen 78, the realization of which is made possible by the solution according to the invention, therefore not only leads to an improved appearance of the luminaire 60, but also protects the latter from interventions by unauthorized persons.Overall, therefore, the solutions according to the invention provide lamps which are distinguished in a positive manner with regard to their appearance and the question of mounting the respective lamp.

Claims

Luminaire (10) having an elongate carrier element (15) for holding a lighting means (18), and also having a likewise elongate cover (20) of approximately U-shaped configuration in cross section, which cover is formed at least partially transparent and can be connected to the carrier element (15) in such a way that the cover (20) together with the carrier element (15) encloses an elongate luminaire interior which is closed off at the two end sides by end caps (25, 45), characterized in that each of the two end caps (25, 45) is formed in two parts, having a first part (30, 50) which is connected to the carrier element (15) and a second part (35, 55) which is connected to the cover (20), wherein the two parts (30, 50, 35, 55) can be latched to one another without tools for connecting the cover (20) to the carrier element (15).Luminaire according to claim 1, characterised in that the first end cap part (30, 50) is substantially plate-like and the second end cap part (35, 55) forms an approximately U-shaped frame which at least partially encloses the first end cap part (30, 50) in the connected state.Luminaire according to claim 1 or 2, characterised in that the end cap part (30) has a latching projection (31) facing the second end cap part (35), which latching projection interacts with a latching hook (38) provided on the second end cap part (35).Luminaire according to claim 3, characterised in that the latching projection (31) is formed approximately in an S- or Z-shape.Luminaire according to claim 4, characterised in that the second end cap part (35) has a recess (39) in the region of the latching lug (38), which enables the insertion of a narrow tool for deflecting the latching projection (31) or latching lug (38) in order to release the latching between the first end cap part (30) and the second end cap part (35).Luminaire according to claim 1 or 2, characterised in that the second end cap part (55) has an outwardly facing latching hook (57), which in the latched state engages behind projections (53) provided on a wall region of the first end cap part (50).Luminaire according to claim 6, characterised in that the second end cap part (55) has a recess (59) in the region of the latching lug (57), which recess allows the insertion of a narrow tool for deflecting the latching lug (57) in order to release the latching between the first end cap part (50) and the second end cap part (55).A luminaire (60) comprising • a luminaire housing (70) in which lighting means are arranged, wherein the luminaire housing (70) forms a light emission opening, and • a cover (80) which closes the light emission openings and is formed at least partially transparent to light, wherein the cover (80) can be latched to the luminaire housing (70) without tools, such that the latching can be released only with the aid of a tool.Luminaire according to claim 8, characterised in that the cover (80) has a circumferential edge region (85), which engages in a corresponding channel (75) of the luminaire housing (70), wherein locking means interacting on the edge region (85) of the cover (80) and on side walls (76) of the channel (75) of the luminaire housing (70) are formed.Luminaire according to claim 9, characterised in that the edge region (85) of the cover (80) has outwardly or inwardly pointing latching projections (86).Luminaire according to claim 10, characterised in that the side wall (76) of the channel (75) of the luminaire housing (70) facing the latching projections (86) has openings (77) or recesses, in which the latching projections (86) engage in the fastened state of the cover (80) on the luminaire housing (70).Luminaire according to claim 10, characterised in that the side wall (76) of the channel (75) of the luminaire housing (70) facing the latching projections (86) has a circumferential groove or recess, in which the latching projections (86) engage in the fastened state of the cover (80) on the luminaire housing (70).Luminaire according to one of claims 9 to 12, characterised in that a seal (79) is arranged in the base region of the channel (75) of the luminaire housing (70), wherein the edge region (85) of the cover (80) dips into the seal (79) in the state locked to the luminaire housing (70).Luminaire according to one of claims 9 to 13, characterised in that the luminaire housing (70) has, in the edge region adjoining the channel (75), a panel (78) which extends substantially closed as far as a plane defined by the rear side of the luminaire housing (70).Luminaire according to one of claims 8 to 14, characterised in that the luminaire housing (70) and the cover (80) are of circular design.

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