Light fixture secured under tension between floor and ceiling.

The present invention relates to a lamp which can be set up by clamping between the floor and ceiling of a room. Lights of this type have become known under the name "tension light". The lights are designed so that their length in the axial direction exceeds the distance between the floor and ceiling of the room. By compressing the lamp against the force of a spring mechanism, the axial length can be shortened. The lamp can then be clamped between the floor and ceiling of the room, the restoring force of the spring mechanism preventing the lamp from falling over.

The present invention has for its object to provide a lamp which is designed as a tension lamp and can be set up in the manner specified above, which can be fed with low voltage (for example 12V) and equipped with low-voltage halogen spotlights.

The solution to this problem is provided by a luminaire with the features of the characterizing part of claim 1.

The installation of the lamp according to the invention is very simple. Due to the inventive design of those parts of the lamp that contain the tensioning mechanism, the safety regulations, in particular with regard to insulation, are also satisfied. The lamp according to the invention is decorative and can be equipped with a larger number of low-voltage halogen spotlights. The spotlights can be clamped in any position, which results in a variety of variations. According to a preferred embodiment of the lamp, either the upper part or the lower part of the lamp can be extended. This makes it possible to manufacture the luminaire in one dimension as standard, so that the luminaire can be set up in an ordinary room with a room height of approximately 2.5 m. According to the invention, however, it is possible in a simple manner to extend the lamp by a piece if it is to be installed in a room with an above-average room height. In this case, too, the customer receives the standard-made lamp and a corresponding extension piece so that he can easily extend the lamp himself to the prescribed size.

The remaining subclaims contain further advantageous embodiments of the present invention.

The present invention is described in more detail below using an exemplary embodiment and with reference to the drawings.

Show<ul id="ul0001" list-style="none"><li>Figure 1 is an exploded view of the upper part of a lamp according to the invention.</li><li>2 shows an exploded view of the lower part of a lamp according to the invention;</li><li>Figure 3 is an exploded view of the upper part of a lamp according to the invention with an extension piece.</li><li>Fig. 4 is an overall view of a lamp according to the invention.</li></ul>

First, reference is made to the illustration according to FIG. 1. Then the upper part of the lamp consists of a shell-like outer tube 10, 24 which receives the two rod-shaped low-voltage busbars 12, 13. In the lower end section 10 there is an insert part 11 which is fixedly connected to the tube (for example by gluing) and which has 2 bores in the outer region for the passage of the busbars 12, 13. In addition, an axial bore with an internal thread is provided in the insert part 11 for receiving a guide rod 14 extending through the tube 10, 24 in the axial direction. The rod-shaped busbars 12, 13 are each provided with an external thread 15 at their upper ends. The ends of the busbars are each received by bores 18, 19 of a second displaceable insert 16. The threaded ends 15 of the busbars 12, 13 are screwed to the insert part 16 by means of nuts 17. An axial bore 20 is provided in the insert part 16, which is stepped and has a larger cross section in the upper region than in the lower region. The axial bore 2o receives a spacer 21 which is designed as a tube for the passage of the guide rod 14. On the guide rod 14 there is also a perforated disk 22, to which a compression spring 23 connects upwards. At its upper end, the guide rod 14 is screwed into an axial bore of a further insert part via an external thread, this insert part in turn being firmly connected to the upper end of the casing of the plastic tube 24. The insert part has an upper threaded bore for receiving a threaded bush 25 provided with an external thread 26. The threaded bushing 25 can be screwed in and additionally glued to the insert part and thus to the upper end of the plastic tube 24 in order to prevent loosening. The upper end of the plastic tube 24 forms a plate 27, by means of which the lamp according to the invention is supported on the ceiling in the assembled state. The plate 27 has a central bore 28 with an internal thread, so that it can be screwed onto the projecting piece of the threaded bush 25.

The clamping of the lamp according to the invention between the floor and ceiling is explained with reference to FIG. 4. The lamp is designed so that the total length of the lamp exceeds the dimension between the floor and ceiling by a few centimeters. When setting up the lamp is then pressed from above in the direction of arrow 54 on the plate 27 and thus on the upper end of the outer plastic tube 10 and this is moved against the force of the spring 23 in the axial direction. Since the two busbars 12 and 13 are rigid and these are screwed to the insert part 16, the insert part 16 then slides with the two busbars 12, 13 inside the tube 10, 24 and presses the spring 23 together via the perforated disk 22. If the lamp is clamped between the floor and ceiling, the compression spring 23 is thus under tension and presses the plate 27 against the ceiling, so that the lamp is securely clamped between the ceiling and floor. Since the busbars 12, 13 are only fed by a low voltage of 12 V, insulation is not necessary. As from Fig. 4th it can be seen, several lighting fixtures 53 can be clamped to the busbars 42, 43 by means of suitable clamping parts 52 in any position. The clamping parts are the subject of the separate earlier application P 37 42 206.5 of the applicant. In the lower section, the two busbars 42, 43 are received in an analogous manner by a corresponding tube part 40, preferably made of plastic, at the lower end of which there is a plate 39 which forms the bearing surface for the floor.

In connection with the plate 39, a housing 36 can be provided for a transformer. In this case, the supply current with mains voltage reaches the transformer via line 37 and is then transformed into the 12V low voltage. However, the transformer does not have to be integrated in the lamp, but can just as well be a separate component. According to the representation of Fig. 2nd are the busbars 42, 43 in the plastic tube 40 of the lower part of the lamp not axially displaceable, but rigid. To clamp the luminaire between the floor and ceiling, it is sufficient if the upper part of the luminaire is resilient. Otherwise, however, the lower part of the lamp is constructed similarly to the resilient upper part of the lamp. A central guide rod 44 is provided, which has an external thread 38 in its upper section and can therefore be screwed to the upper insert part 41, which has a corresponding bore with an internal thread. The two busbars are also received in the upper section in corresponding bores in the insert part 41. The two busbars 42, 43 each have an external thread 45 in the lower end region. The lower insert 46 again has three bores, namely a central axial bore 50 for the passage of the guide rod 44 and two further bores 48, 49 in the outer region for the passage of the end pieces of the busbars 42, 43. The bores 48, 49 are in the The upper area is enlarged in cross section so that a form-fitting reception of correspondingly thickened sections of the busbars 42, 43, which are located above the thread 45, can take place. An abutment is thus provided for the end sections of the busbars 42, 43. The busbars 42, 43 are then fixed to the insert part 46 with the aid of the nuts 47. The nuts 47 have at the same time terminals 51 in the manner of luster terminals, so that the current-carrying low-voltage lines can be clamped there.

3 now shows how the upper part of the lamp can be easily extended if the distance between the floor and ceiling is greater than the length of the lamp, so that clamping the lamp is not easily possible. The comparison of FIGS. 3 and 1 shows that the upper part of the lamp is also constructed in the extended version up to the upper end of the guide rod 14 and the outer plastic tube 24. If the upper part of the lamp is to be extended upwards starting from the standard version shown in FIG. 1, the plate 27 is first unscrewed. The threaded sleeve 25 then protrudes somewhat beyond the end of the plastic tube 24 and the external thread 26 of the threaded sleeve is exposed in the upper section. A type of extension rod 30 is then first screwed onto the threaded bushing 25, which has at its lower end an area with a larger external cross section and internal thread 34, that is to say an integrally formed threaded bushing 33. At its upper end, the extension rod 30 in turn has an external thread 35. Furthermore, a tube extension piece 29, preferably made of plastic, is required to extend the outer tube 24 to extend the lamp. The outer tube has a shoulder 31 at its upper end, so that there is a guide for the end of the tube extension piece 29. After fitting the pipe extension piece, the plate 27 can then be screwed on again. The plate has a short socket 32 ​​with a slightly smaller diameter than the pipe extension piece 29, so that the short socket 32 ​​can be received by the pipe extension piece 29 and thus a guide is also available for the plate 27. The central bore 28, which is formed in the plate and has an internal thread, enables the plate 27 to be screwed onto the external thread 35 of the extension rod 30, which protrudes somewhat above the pipe extension piece 29. This provides an easy way to extend the luminaire accordingly if the room height exceeds a standard dimension of 2.50 m or 2.60 m. The extension of the lamp can be done by the customer himself. The tube extension piece 29 is supplied together with the extension rod 30 by the lamp manufacturer in various standard lengths, for example 10 cm, 20 cm etc.

Reference list

<ul id="ul0002" list-style="none"><li>10th outer plastic tube</li><li>11 Insert part</li><li>12th live bar</li><li>13 live bar</li><li>14 Guide rod</li><li>15 External thread</li><li>16 Insert part</li><li>17th mother</li><li>18th outer bore</li><li>19th outer bore</li><li>20 central hole</li><li>21 Spacer</li><li>22 Perforated disc</li><li>23 Compression spring</li><li>24th Plastic pipe <img file="EP0324176A2_D0001.tif" /> 10</li><li>25th Threaded sleeve</li><li>26 External thread</li><li>27 Plate</li><li>28 Hole with internal thread</li><li>29 Pipe extension piece</li><li>30th Extension rod</li><li>31 paragraph</li><li>32 short neck</li><li>33 molded threaded sleeve</li><li>34 inner thread</li><li>35 External thread</li><li>36 Transformer housing</li><li>37 Power cord</li><li>38 External thread</li><li>39 cover</li><li>40 outer tube</li><li>41 Insert part</li><li>42 live bar</li><li>43 live bar</li><li>44 Guide rod</li><li>45 External thread</li><li>46 Insert part</li><li>47 mother</li><li>48 outer bore</li><li>49 outer bore</li><li>50 central hole</li><li>51 Connector</li><li>52 Clamp</li><li>53 Light spot</li><li>54 arrow</li><li>55 drilling</li><li>56 drilling</li></ul>