Abstract:
The invention relates to a luminaire ( 1 ) having a luminaire housing ( 2 ) and an adjustable spotlight arrangement ( 10 ). In order to achieve a movement of the spotlight arrangement ( 10 ) which is dependent in two degrees of freedom on one another, the spotlight arrangement ( 10 ) is held displaceably in a displacement direction ( 5   b ) of the luminaire housing ( 2 ), and there is provided in the luminaire housing ( 2 ) a pivot guide slot member ( 14 ), by means of which upon displacement in the displacement direction the spotlight arrangement ( 10 ) is compulsorily and reproducibly pivoted.

Description:
FIELD OF THE INVENTION 
     The invention refers to a luminaire according to the preamble of claim  1 . 
     It is possible with a luminaire of this kind to adjust the adjustable spotlight so that the main direction of emission is turned towards a certain part region of the available adjustment range. It is thus possible to illuminate primarily only this part region. Such a luminaire is therefore suited for emphasizing by illumination the part region in the room present e.g. for decorative reasons or to illuminate objects in the part region, e.g. a picture or a device or an information sign, and improve the visibility thereof. A luminaire of this kind is thus also excellently suited for a showroom or a gallery or a museum to emphasize optically by illumination at least one object arranged in the associated part region. 
     BACKGROUND OF THE INVENTION 
     From DE 197 44 638 A1 there can be understood a luminaire with an adjustable spotlight, which has a housing, which is connected with a holder means by such a joint arrangement that the housing forming the spotlight is adjustable into individual pivoted positions of a movement plane. 
     Although with this previously known luminaire adjusting the spotlight is possible, and this into individually selectable positions, a difficulty can however be seen because the operating person must manually bring about the desired position. In addition, this luminaire is formed without a luminaire housing, through which lever linkages present are freely visible. 
     SUMMARY OF THE INVENTION 
     The invention has the object of so configuring a luminaire of the kind indicated in the introduction so that dependent movement of the spotlight in two degrees of freedom is achieved and preferably also that an arrangement of the mechanics making possible the adjustability of the spotlight arrangement which is protected at least on multiple sides is achieved. 
     This object is achieved by the features of the claim  1 . Advantageous further developments of the inventions are described in the dependent claims. 
     With the luminaire according to the invention the spotlight is held displaceable in a straight-line displacement direction of the luminaire housing, wherein a first pivot guide slot member is located on the luminaire housing, by means of which upon moving in the displacement direction the spotlight is compulsorily and reproducibly pivoted. Through this not only is a selective adjustment of the spotlight in the displacement direction possible but there is also achieved at the same time a compulsorily controlled pivot movement of the spotlight. Since the movement in the displacement direction is effected in a guide slot member, there is consequently provided both for the displacement movement and for the pivot movement of the spotlight a compulsory guidance. The operating person needs therefore only to move the spotlight in the displacement direction, whereby the spotlight is at the same time pivoted. The displacement direction and the size of the pivot movement can thereby be selectively determined by the design of the guide slot member. 
     As a guide for the displacement movement a displacement guide slot member which includes an acute angle with the pivot guide slot member can be provided. 
     Thereby, the luminaire can be so constructed that in a middle position of the displacement range the spotlight is in a middle position of its pivot range, and with displacement movements going beyond the middle range in each case a pivot movement is attained oppositely directed to the previous pivot movement. 
     By means of a pivot movement relative to the carrier of the spotlight (with its carrier) directed transversely to the above-described first pivot movement of the spotlight, the illumination area can be enlarged or shifted also to the side. 
     Features which make a selective pivot movement of the spotlight possible in a second pivot plane, which is at right angles to the first displacement plane containing the displacement direction, are contained in further dependent claims. This configuration makes it possible, with reference to the displacement plane, to illuminate offset areas to the side of the room present, wherein these areas are compulsorily reached and set by means of a displacement in the displacement direction. 
     Below, advantageous configurations of the invention are explained in more detail with reference to a preferred exemplary embodiment and the drawings. There is shown: 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  a first exemplary embodiment of a luminaire according to the invention with a housing and an adjustable spotlight, in a perspective illustration from one side and below; 
         FIG. 2  the luminaire in a slightly rotated perspective and in another pivot position of the spotlight; 
         FIG. 3  the luminaire in another side perspective; 
         FIG. 4  the luminaire in a view from below, 
         FIG. 5  a displacement and pivoting mechanism of the luminaire in a left displacement and pivot end position; 
         FIG. 6  the mechanism in an intermediate position displaced in direction towards the other displacement and pivot end position; 
         FIG. 7  the mechanism in its middle position of the displacement and pivoting range; 
         FIGS. 8 to 10  various views of a second exemplary embodiment of a luminaire according to the invention; 
         FIGS. 11   a ,  11   b  light emission with a luminaire having a pivotable spotlight in accordance with the state of the art; 
         FIGS. 12   a ,  12   b  light emission with another luminaire having a pivotable spotlight in accordance with the state of the art; 
         FIGS. 13   a ,  13   b  an illustration corresponding to  FIGS. 11   a ,  11   b  and  12   a ,  12   b  with a luminaire according to the invention and 
         FIGS. 14   a ,  14   b  perspective views of the illustrations in  FIGS. 13   a ,  13   b.    
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The main components of the luminaire designated as a whole by  1  are a luminaire housing  2 , a spotlight  3 , a carrier  4  for the spotlight  3 , a displacement mechanism  5  through which the carrier  4  is displaceably connected in a displacement plane  5   a  ( FIG. 4 ) with the housing  2  or extension parts of the same, and a first pivoting mechanism  6  ( FIG. 5 ) through which the carrier  4  is pivotable back and forth around a pivot axis  6   a  which extends approximately at right angles to the displacement plane  5   a  or in parallel thereto. An adjusting device containing the displacement mechanism  5  and the pivoting mechanism  6  is designated as a whole by  7 . The carrier  4  and the spotlight  3  form a spotlight arrangement  10  displaceable as a movement unit in the displacement plane and pivotable. 
     The housing  2  is formed pot-shaped with a base wall  2   a  and a peripheral wall  2   b  so that it has an open housing side, the opening of which is designated by  2   c . The displacement mechanism  5  and the pivoting mechanism  6  are at least partly located in the hollow space of the housing  2 , whereby they are at least partly covered at the side by the peripheral wall  2   b . In the exemplary embodiment the housing  2  has a cuboid-like form with a substantially flat base wall  2   a  preferably of quadrilateral form, from the edges of which four side walls project, of which in each case two mutually oppositely lying side walls are designated by  7  or  8 . 
     The side walls may be of different length. In the exemplary embodiment there are provided two broad-side side walls  7  which extend to two sides and parallel to the displacement plane  5   a , and two narrow-side side walls  8  which extend at right-angles to the displacement plane  5   a.    
     The housing  2  has at least one non-illustrated fastening element, e.g. a hole in the housing wall through which the housing  2  can be screwed together with the ceiling or wall by means of at least one screw. 
     The displacement mechanism  5  has at least one guide slot member  9 , in which the carrier  4  is selectively movable back and forth in the displacement plane  5   a , preferably in a straight line and in particular approximately parallel to the base wall  2   a . The guide slot member  9  is formed by an e.g. continuous first guide groove  11  in a guide wall  12 , wherein the carrier  4  is mounted movably longitudinally back and forth with a guide pin  13  in the guide groove  11  and is secured against a transversely directed slipping out of the guide groove  11 . In the exemplary embodiment there are present two guide walls  12 , e.g. forming the broad-side side walls  7 , each with a first guide groove  11 , which are arranged mutually oppositely lying and between which the carrier  4  is mounted with two displacement guide pins  13  at the side arranged mutually oppositely lying. The guide pin or guide pins  13  are circular in the cross-section so that the carrier  4  is not only movable longitudinally of the displacement direction  5   b  but also is pivotable back and forth in the displacement plane  5   a.    
     The compulsorily effective first pivoting mechanism  6  is so associated with the displacement mechanism  5  that upon a displacement of the carrier  4  this compulsorily and at the same time carries out a pivot movement around the pivot axis  6   a  which extends at right angles to the displacement plane  5   a  and extends axially through the displacement guide pin  13 . 
     The first pivoting mechanism  6  may be formed by at least a second guide slot member  14 , which is likewise is formed by a guide groove  15  in the guide wall  12  and extends parallel to pivot plane  6   b  of the carrier  4  corresponding to the displacement plane  5   a  and thereby has a preferably constantly varying effective spacing from the first guide slot member  9  and into which the carrier  4  engages with a second guide pin  16  having a circular cross-sectional form. The second guide slot member  14  may thereby develop in a straight line or in an arc shape. In the first case the angle of inclination included between the guide slot members  9 ,  14  is equal to W 1 . In the second case it can continuously increase or decrease itself. 
     The maximum spacing a is smaller than the spacing b between the two guide pins  13 ,  16 , through which the carrier  4  always stands at an angle with reference to the guide grooves  11 ,  15  and a dead point disposition for the carrier  4  is prevented. 
     When moving in the guide slot members  9 ,  14  between the ends thereof the carrier  4  is consequently pivoted between a minimum pivot position (see position of the carrier  4  in solid lines in  FIG. 7 ) and a maximum ( FIG. 5 ) pivot position movement. The first guide slot member  9  develops approximately parallel to the base wall  2   a  in the exemplary embodiment. 
     With the displacement into the end position to the left in accordance with  FIG. 5  the carrier  4  with the spotlight  3  is so pivoted that with reference to its above-described position in  FIG. 7  the carrier  4  includes an acute angle W 2 , which e.g. may be 45°. 
     To stabilize the pivoting mechanism  6  it is advantageous to provide in each case two second guide slot members  14  or guide grooves  15  on the two sides of the first guide slot member  9 , here above and below the guide slot member  9 . In this case there are arranged on the carrier  4  two second guide pins  16  in each case at a double spacing b from one another so that both guide pins  16  enter into the guide grooves  15  and are guided therein. 
     For enlargement of the pivoting range of the carrier  4  it is advantageous to extend the first guide slot member  9  and the second guide slot members  14  beyond the associated middle plane, in particular mirror symmetrically, so that there arises an X-form development. Upon a displacement of the carrier  4  beyond this middle region the carrier  4  can be pivoted with the spotlight  3  in the opposite pivot movement direction, so that the overall attainable pivot movement angle W 3  may be larger, e.g. twice as large, as W 2 , whereby the spotlight  3  is in each case directed to the side of the luminaire, which is directed opposite to the outwardly directed displacement direction  5   b . The opposite, right, pivot movement position of the carrier  4  in  FIG. 7  is indicated by broken lines. 
     Within the scope of the invention the two guide grooves  15  or the three guide grooves  11 ,  15  may transition into one another in the region of their minimum spacing a such that the guide pins  16  or  13  and  16  lie behind each other in the displacement direction  5   b , whereby the carrier  4  is with its side for mounting for the spotlight  3 , e.g. for a ceiling fastening, directed downwardly. 
     If the guide grooves  11 ,  15  transition into one another, they form a quasi junction. By e.g. manual turning or guiding the second guide pins  16  can be led respectively into the associated upper or lower guide groove branch. 
     Through different depth of the guide grooves  11 ,  15  it can be prevented that the guide pins  13 ,  16  enter into the respective not associated guide groove  11 ,  15 . In the exemplary embodiment the depth of the second guide groove  15  corresponds only to a part of the thickness of the guide wall  12 , so that this guide part is covered from the outside. 
     To be able to pivot the spotlight  3  also transversely to the displacement plane  5  and to be able to illuminate areas to the side thereof the spotlight  3  is pivotably connected with the carrier  4  around a pivot axis  17   a  by means of a second pivoting mechanism  17 , the pivot axis  17   a  preferably running in the displacement plane  5   a  or parallel thereto or may include an acute angle (not illustrated) with the displacement plane  5   a.    
     The pivoting mechanism  17  or the carrier  4  may e.g. have two fork arms  18  having a spacing e, directed longitudinally of the displacement plane  5   a , from each other, with which fork arms the spotlight  3  is connected pivotably around the pivot axis  17   a , e.g. in that the fork arms  18  engage over the spotlight  3  and between the spotlight  3  and the fork arm ends rotary bearings  19  are provided. These may e.g. be formed by joint pins  19   a  projecting radially from the spotlight  3 , which are mounted rotatably in bearing sleeves  19   b  arranged on the carrier  4 . To be able to offer sufficient space for the pivoting of the spotlight  3  the rotary bearings  19  are arranged in the end region of the fork arms  18 , which project from an e.g. flat base part  4   a  of the carrier  4  towards the side away from the base wall  2   a . In order further to achieve a small construction the base part  4   a  has a recess  4   b , into which the spotlight  3  can freely enter in the case of an appropriately large pivot movement. 
     The displacement mechanism  5  and the pivoting mechanism  6  are formed such that at least in the illustrated pivot end positions the carrier  4  and the spotlight  6  are located in the hollow space of the luminaire housing  2 , thus below the base wall  2   a . Through this a low-profile construction of the luminaire  1  is ensured. 
     It is advantageous for the stabilization of the guide edges of the first guide grooves  11 , formed preferably as continuous slots, to provide edge extensions  11   a  on the edges thereof which are e.g. formed by stamping the edges of the first guide groove  11 . 
     As can be recognized from  FIGS. 1 to 3 , the two guide walls  7  form the side walls  7 , whereby of the actual side walls only edge strips  7   b  are present and connected with the neighbouring side walls  8  and the base wall of  2   a , whereby the guide walls  12  bear on the inner side on the edge strips  7   b  and are fastened in a manner not illustrated, e.g. by gluing. 
     In that the guide walls  12  are per se separate components which are installed in construction, it is possible on the one hand to prefabricate the guide walls  12  in a simple manner as individual components and on the other hand to form them economically of a material of higher strength, e.g. higher wear resistance, to ensure a long working life. 
     The spotlight  3  has preferably a low construction height h which e.g. can be formed by a plate  3   b  given a concave form on the emission side, which can have on its side towards the luminaire housing  2  an outward bulging  3   c . At the inner side, connection elements  3  for the electrical power supply are arranged, to which non-illustrated flexible electrical lines extend with such a length that the spotlight  3  can execute its displacement and pivot movements. The electrical lines extend e.g. through a line through-way into the interior of the luminaire housing  2  in which they can be fastened to the luminaire housing  2  in the area of the line through-way. 
     In order to be able in each case to position the spotlight  3  in its position pivoted around its pivot axis  17   a , at least one suitable positioning means is provided that positions the spotlight  3  in the adjusted pivot position. This may be provided e.g. by a stiffness of at least one rotary bearing  19 , which for pivoting and adjusting the spotlight  3  can be manually overcome. 
     A second exemplary embodiment of a luminaire according to the invention is illustrated in  FIGS. 8 to 10 . Just like the first exemplary embodiment of  FIGS. 1 to 7  this second exemplary embodiment of the luminaire, provided overall with the reference sign  101 , has as main components a luminaire housing  102 , a spotlight  103 , a carrier  104  for the spotlight as well as a displacement mechanism  105  with the aid of which the carrier  104  is mounted within the housing  102  displaceable in a straight line in a displacement plane. In turn, the carrier  104  and the spotlight  103  form a spotlight arrangement  110 . Furthermore the luminaire  101  is configured in turn such that a compulsory pivoting of the spotlight  103  takes place upon a displacement along the displacement direction. 
     A specific feature of the second exemplary embodiment consists that in the displacement of the spotlight  103  is not now manually effected but by means of a drive provided therefor. First, for this purpose, the luminaire  101  has a first electric motor, connected with a shaft  121  and drives this or sets it in rotation. The shaft  121  extending longitudinally through the luminaire housing  102  has an external thread which in turn cooperates with a corresponding internal thread of a guide sleeve  126  which is fastened to a guide slider  125 . As can be understood in particular in the illustration in  FIGS. 9 and 10 , the guide slider  125  has end side pins  127  which engage into a guide groove  111  of a guide sleeve  109  of the luminaire housing  102 . Depending on the direction in which the shaft  121  is rotated by the electric motor  120 , the slider  125  is therefore moved in the one or other direction of the luminaire housing  102 . 
     In turn, the simultaneous pivoting of the spotlight  103  during a longitudinal movement of the guide slider  125  is effected by means of another guide groove  115  which is provided at a side wall of the housing  102 . Into this guide groove  115  there engages a pin  113  located on the carrier  104  and correspondingly forms, depending on position of the slider  125  within the luminaire housing  102 , a bearing point for the carrier  104  of the spotlight  103 . The carrier  104  itself is mounted pivotably on the slider  125  which consequently brings about that, upon a movement of the slider  125  in the one or other direction, the spotlight  103  fastened to the carrier  104  is also pivoted in a suitable manner. 
     In turn the guide groove  115  is configured such that the spotlight  103  can be pivoted between two maximum pivot settings which in each case correspond to a positioning of the spotlight  103  near the end faces of the luminaire housing  102 , whereby at a middle position of the spotlight  103  in the housing  102  the spotlight  103  is directed vertically towards the underside. 
     By means of a suitable suspension of the spotlight  103  on the carrier  104  there is finally also made possible a pivoting around a second axis  117   a , whereby an electrical drive is provided also for this. For this purpose the luminaire  101  has another electric motor  130  which is attached to the carrier  104  and is connected via a toothed belt  131  with a gear wheel  132  fixedly attached with the second pivot axis  117   a  of the spotlight  103 . Thus the second electric motor  130  permits pivoting of the spotlight  103  in a desired way around the second pivot axis  117   a.    
     As also with the first exemplary embodiment the advantage according to the invention is provided that the luminaire  101  has a relatively low structural height, since the pivoting of the spotlight  103  around the first pivot axis  106   a  is afforded by a special pivoting mechanism which converts a straight-line movement of the carrier  104  into a pivot movement of the spotlight  103 . The use of the electric motors  120 ,  130  allows now, however, a remotely controlled adjusting of the spotlight position to be effected. This is particularly of advantage in such application cases in which the luminaire  101  is accessible only with difficulty due to its arrangement. For example in rooms in which the ceiling has a high distance from the ground a comfortable adjusting of the spotlight position is possible through this. 
     A particular advantage of the present invention can be clarified again with reference to  FIGS. 11 to 14 .  FIGS. 11   a  and  11   b  thereby first show a spotlight luminaire  201  configured conventionally in which the behaviour is illustrated in case that the spotlight  203  is directed vertically to the underside ( FIG. 11   a ), and for the case the spotlight  203  is pivoted around an axis. With the luminaire  201  illustrated in  FIGS. 11   a  and  11   b , the spotlight  203  is thereby so mounted within the housing  202  such that it slightly projects with its front side beyond a middle emission opening  205  of the luminaire housing  202 . A displacement parallel to the base surface of the housing, such as is provided with the present invention, is not possible with this known luminaire. 
     As can be understood from the illustration in  FIG. 11   b , pivoting of the spotlight  203  in a lateral direction brings about that a part  207  of the light emitted by the spotlight  203  is blocked by the lower cover  206  of the luminaire housing  202 . In the illustrated example this can lead to light losses of 25%. 
     If the spotlight is mounted inside the luminaire housing further upwardly so that it does not project over the emission opening of the housing, the light losses appearing upon pivoting the spotlight are even greater, as the illustrations of the  FIGS. 12   a  and  12   b  show. In this case the arrangement of the spotlight with reference to the lower cover of the luminaire housing is even more unfavourable, so that a large component of the emitted light is blocked (up to 50%). 
     With the spotlight luminaire  1 ,  101  according to the invention it is made possible it by the combination according to the invention of displacement and pivoting of the spotlight  3 ,  103 , however, that the spotlight  3 ,  103  is always directed in the same way at a middle emission opening  40 ,  140 , which is formed in a lower cover  41 ,  141  of the housing  2 ,  102 . In particular from the sectional views of  FIGS. 13   a  and  13   b  it can be understood that even in pivoted state of  FIG. 13   b  the spotlight  3 ,  103  is so oriented that the cone of light  42 ,  142  coming therefrom can completely emitted through the emission opening  40 ,  140  of the luminaire housing  2 ,  102 . This represents a clear advantage over classic spotlight luminaires since now multiple possibilities for the orientation of the spotlight  3 ,  103  arise, without the danger that a light loss would arise. 
     Thus, by means of the present invention there is provided a spotlight luminaire which is distinguished through its multiple adjustment possibilities, which make possible at any time an optimized alignment of the spotlight. At the same time a flat structure of the luminaire is ensured since the corresponding alignment of the spotlight is brought about by the adjusting device configured accordingly to the invention. Finally, there is provided the possibility of carrying out the adjusting of the spotlight by remote control, through which the range of possible applications for the luminaire is further improved.