Lighting system with lamps arranged between two low-voltage conductors
The invention relates to a lighting system comprising lamps, in particular projectors, arranged between low-voltage conductors, whereby conductors provided for instance as ropes, cables, or wires are parallel arranged and fixed by means of holding devices, and lamps are connected to conductors by means of two electrically conductive barshaped supports and, in an electrically conductive manner, by means of fixtures arranged at supports. 
     Lighting systems of the prior art are known to have plates arranged as webs between conductors, interconnected by means of screw mountings and clamped to the conductors. The projector is fixed to the plates and supplied with current from the conductors through a particular cable. This common lighting system is difficult to install and to adjust with regard to the beam angle. The plates arranged as webs are furthermore irritating, giving a relative rude impression compared to the conductors. The conductors must further be braced between opposite surfaces, such as walls. This is a disadvantage, because several pairs of conductors are necessary for large area room lighting and a low tension transformer must be provided for each of them. Further, several bracing and fixing means are necessary so that assembly is time-consuming and expensive. 
     The object of the invention is to provide a said lighting system, which is easy to install and to adjust, whereby projectors are optically conformed to the conductors and special cables are not necessary for the projectors, and whereby a deviation of the conductors within the range of small angles up to 180° can be adjusted between support surfaces by means of suited holding devices. 
     According to the invention the problem is solved in that two conductors are diametrically arranged at the lamp holder radially to its longitudinal axis, connected to contacts of the bulb inside the lamp holder, pivoted at their outer end sections in each case to one electrically conducting bar-shaped support, which comprises a rotatable fixture with a swivelling axis arranged to the longitudinal axis of current-carrying bars, whereby each fixture can be connected to a current conductor that its surface areas, that are arranged normal to the swivelling axis, parallelly arranged relative to the longitudinal axis of the current-carrying bars, and that for support of the current conductors two deviation segments with a guidance for a rope, cable, wire or the like are provided, interconnected by means of a holding device, pivoted to a wall support by means of a ceiling support or by means of at least one supporting arm. Each lamp can be adjusted to achieve a beam angle desired by means of the cardanic lamp mounting between the conductors. Further, the lighting system with the conductors give a very filigreed impression, in particular when several lamps are installed, so that lighting system can be used not only of illumination, but also as a creative element in closed rooms. 
    
    
     Further features of the invention are described in the subclaims and will be explained according to the embodiments shown in the drawings. It shows 
     FIG. 1 a section of the lighting system according to the invention in a diagrammatic perspective view, 
     FIG. 2 a projector between two conductors in a diagrammatic view, 
     FIGS. 3a to 3d a fixture of the projector according to FIG. 2 in different views, 
     FIGS. 4a and 4b a holding bush for the supports of the projector in a diagrammatic cross view, 
     FIGS. 5 and 6 an altered embodiment of the projector in diagrammatic side views, 
     FIG. 7 the projector according to FIG. 5 in a diagrammatic top view, 
     FIGS. 8 to 10 the lamp holder of the projector in side views and in a top view, 
     FIG. 11 the supporting frame of the projector in a diagrammatic top view, 
     FIGS. 12 and 13 the supporting frame according to FIG. 11 in two side views, 
     FIG. 14 the holding device in a perspective view, 
     FIG. 15 the holding device according to FIG. 14 in a top view, 
     FIG. 16 the holding device according to FIG. 14 in a sectional view, 
     FIG. 17 the deviation device of the holding device in an enlarged sectional side view, 
     FIGS. 18 and 19 further embodiments of a deviation device in perspective views, 
     FIG. 20 a lamp ballast with a ceiling support in a side view, 
     FIG. 21 a ceiling support with a cable tightener in a side view. 
     Lighting system 100 consists of two parallel arranged low-voltage current conductors 2, 3 being connected to lamps 1, as well as a suspended lamp 50. The lamp holders 4 of lamps 1 are connected to bar-shaped supports 12, 13 provided as quarter circle and connected to low-voltage current conductors 2, 3 by means of current-carrying bars 6, 7. Lamp 1 of suspended lamp 50 is connected by means of current-carrying bars 6, 7 to current-carrying bars 90, which are connected to a low-voltage current conductor 2, 3 by means of a fixture 91. Current-carrying bars 6, 7 are connected to lamp holder 4. An antiglare plate 93 is arranged in front of and remote from the projector holder 42 of the suspended lamp 50. Deviation of low voltage current conductors 2, 3 is performed by means of deviation segments 52, 53 in the region of a holding device 51. Low-voltage current conductors 2, 3 are connected at one end section to a lamp ballast comprising a transformer and being connected by means of cable tighteners 92 to a holder, which is not shown in detail. According to the desired deviation of low-voltage current conductors 2, 3, the circle segment provided as deviation segment 53 may have an opening angle of different size. 
     If the lighting system 100 is used as a creative room element, it is an advantage, to provide the low-voltage current conductors 2, 3 with a number of lamps 1, possibly suspended lamps 50, which give the general impression of a filigree lamp network. 
     Lamp 1, shown in FIG. 2, comprises a lamp holder 4, at which a projector bulb holder 42 with a bulb 9 is arranged. The projector bulb holder 42 is fixed by means of a clamp bow 43 at the lamp holder 4. At this, two current-carrying bars 6, 7 are diametrically arranged, radially to longitudinal axis 5 of lamp holder 4, pivoted at their outer end sections 10, 11 to the specific electrically conducting rod shaped support 12, 13. Each support 12, 13 forms a quarter circle. At the end sections 14, 15, opposite to current-carrying bars 6, 7, each support 12, 13 is connected to a fixture 16, 17, which is pivoted at supports 12, 13. The fixtures 16, 17 are connected to low-voltage current conductors 2, 3. Each fixture 16, 17 comprises a cylinder 34 with a bearing journal 31 arranged at the front 35. Cross-wise to longitudinal axis 18 of fixture 16, 17, an opening 36 is so arranged that section 32 of cylinder 34, opposite to bearing journal 31, is provided as fork-shaped piece 37, which is open at one end. The opening section 38 of this fork-shaped piece 37 can be closed by means of a closing member 39. Closing member 39 is provided as closing cap 40 at which a threaded journal 41 is provided. For closing of the opening section 38 closing cap 40 can be screwed into cylinder 34 by means of threaded journal 41. Threaded journal 41 is therefore used as clamping member, which can be used to jam the fixture 16, 17 to a current conductor 2, 3 (FIGS. 3a-3d). The combined effects of the rotary joints arranged at end sections 15, 26 of supports 12, 13, provide a cardanic mounting of the lamp holder 4, that any beam angle of lamp 1 can be achieved. 
     At each end section 10, 11 of current-carrying bars 6, 7, a holding bush 47 is provided, which is rotatably arranged at the current-carrying bars 6, 7 and connected to end sections 26 of supports 12, 13. Each holding bush 47 is provided with a through hole 95, which is transversally arranged to longitudinal axis and where the outer end section 26 of support 12, 13 is passed through. Each specific support 12, 13 can be clamped in the through hole 95 by means of closing member 39. A further opening 97 for current-carrying bars 6, 7 is provided coaxially to longitudinal axis of holding bush 47. The current-carrying bars 6, 7 can be clamped in these openings 97 by means of clamping screws which are inserted in integral nuts 96 of closing member 39 (FIGS. 4a and 4b). 
     By connecting a fixture 16, 17 to a holding bush 47, a fixture 91 can be used for mounting a current-carrying bar 90 at a low-voltage current conductor 2, 3. Therefor, bearing journal 31 of cylinder 34 is inserted in opening 97 of holding bush 47 and clamped by means of a screw, which is screwed in screw bore 96. The opening 36 of cylinder 34 is used for receiving a low-voltage current conductor 2, 3, whereas a current-carrying bar 90 is clamped in through hole 95 of holding bush 47. 
     Lamp 1 is diagrammatically shown in FIGS. 5 to 7. Two blind holes 8 are provided in lamp holder 4, arranged oppositely, used for receiving a current-carrying bar 6, 7. An opening 106 is further provided in the lower region of lamp holder 4 with freely arranged end sections of current-carrying bars 6, 7 insert4ed in blind holes 8. Further, a blind hole 98 opened below is provided in each end section of current-carrying bars 6, 7, in which a contact 105 of the bulb 9 of lamp 1 is inserted (FIGS. 5, 6, 8). A groove 45 is provided at the end sections of current-carrying bars 6, 7 inserted in the lamp holder 4. A pin 46 is guided in said groove 45 to secure the specific current-carrying bar 6, 7 of lamp holder 4 against shifting (FIG. 8). Instead of a pin 46, a screw or the like can also be used. It is also possible, not to provide a groove 45 at the end sections of current-carrying bars 6, 7, but to stick the end sections of each current-carrying bar 6, 7 in the particular blind hole 8 of lamp holder 4. In this case, pins 46 are not necessary. 
     As shown in FIGS. 5 and 10, the clamp bow 43 is arranged in guiding grooves 44, provided at that side of lamp holder 4 remote from projector holder 42. Guiding grooves 44 avoid side shifting of clamp bow 43. Clamp bow 43 presses the contacts 105 of bulb 9 into the particular blind hole 98 by means of projector holder 42 so that a steady current contact to the particular current-carrying bar 6, 7 is achieved. 
     A further embodiment of a frame of lamp 1 is diagrammatically shown by an enlarged representation in FIGS. 11 to 13. Each support 12, 13 is provided as a circular ring segment 20, 21 having an angle of 90°. At each end sections 22, 23 of current-carrying bars 6, 7 a groove 24 is provided, in which a screw 25 arranged in support 12, 13 is engaged. Therefor, a threaded hole 27, in which screw 25 is inserted, is provided at the front end sections 26 of supports 12, 13, arranged towards the current-carrying bars 6, 7. In the front section 28 of support 12, 14, arranged towards fixture 16, 17, a threaded hole 29 is also provided. A screw 30 is arranged herein, which can be put against the bearing journal 31, 32 of fixture 16, 17, inserted in the support 12, 13. A groove 33 is provided at each bearing journal 31, 32, against which the screw 30 located in threaded hole 29 can be put. 
     The holding device 51, shown in FIGS. 14 and 15, comprises two deviation segments 52, 53, carrying one cable 54 as current conductor 2, 3 in each case. The deviation segments 52, 53 are interconnected by means of a holding device 55. Holding device 55 is pivoted to a wall support 58 by means of two supporting arms 56, 57. This one can be fixed for instance at a wall 85. 
     The deviation device of holding device 51 is shown in detail in FIG. 17. One deviation segment 52 is provided as a bush 59 with an outer circulating groove 60, carrying a cable 54. The other deviation segment 53 is provided as a disk segment 61 with a groove 62 in the outer arc area 63. The deviation segments 52, 53 are interconnected by means of clamping plates and attached to both supporting arms 56, 57 by means of a screw connection 66. Screw connection 66 consists of a threaded sleeve 67 with a stop flange 68 and a screw 69 with screw head 70, which can be screwed into threaded sleeve 67. The threaded sleeve 67 is passed through an opening 72 in lower supporting arm 56, through openings 73 in clamping plates 64, 65, and through opening 74 in bush 59, which is the deviation segment 52. The screw 69 is inserted in an opening 75 in the other supporting arm 57 and screwed in the blind hole 71 with inside thread of threaded sleeve 67. The supporting arms 56, 57 are pressed against clamping plates 67, 65 by means of stop flange 68 and screw head 70. 
     Guiding devices can be provided in the clamping plates 64, 65, which interlock in the deviation segment 53. Therefore, e.g. webs or pins 76 can be provided as guiding devices, which interlock in the grooves or openings 77 of disk 61. 
     Wall support 58 comprises a bar-shaped basic body 78 with a circular or cornered cross section. At one end section 79 supporting arms 56, 57 are so arranged by means of a screw connection 80 that they can be turned around the center axis 81 of threshold bolt 82. At the other end section 83, the basic body 78 is, connected to a wall support 84. Wall support 84 may consist of a screw shank 86, which is for instance screwed in a plug in a wall 85. A projecting pin 87 is provided in screw shank 86, inserted in an opening 88 of the bar-shaped basic body 78 and clamped by means of a screw 87 arranged at basic body 78. 
     The clamping plates 64, 65, the deviation segments 52, 53, the supporting arms 56, 57, and the bar-shaped basic body 78 can be made of metal or plastics. For aesthetic reason, the plastics can also be transparent. 
     According to the deviation angel desired for the cables 54, a deviation segment 53 with an adapted deviation angel α can be arranged between clamping plates 64, 65 and connected to the holding device 55. Hereby it is possible, to arrange by simple means e.g. low voltage current conductors distributed in rooms even at an angle, without providing additional transformers. 
     One holding device 51 is shown each case in FIGS. 18 and 19 providing deviation segments 53 with a deviation angle α of 180°. Whereas according to FIG. 19 holding device 51 is connected to wall support 58 by means of supporting arm 57 and, the deviation segment 52 of holding device 51 is connected to ceiling support 99 according to FIG. 18. Ceiling support 99 comprises a distance bar 101 that is connectable to the ceiling, and is supported at the ceiling, in the pull direction of cables 54, by means of a supporting bar 102. Supporting bar 102 sits close to the ceiling with a spherical end section 103. Further, the supporting bar 102 is passed through an opening, not shown in detail, in the distance bar and can be arrested by means of a locking screw 104. 
     It is also possible, to attach the lamp ballast 49 and the cable tightener to ceiling supports 99 (FIGS. 20 and 21). The lamp ballast 49 is practically so provided that it can be fixed to the supporting bars 102, as well as possibly to the cable tightener.