DE20007434U1 - Light bollard - Google Patents

Description

Neymeyer & Partner GbR, patent attorneys

H 250 20 April 2000

Applicant: HESS FORM + LICHT GMBH +Co., 78050 Villingen-Schwenningen

Applicant No.: 4312716
Description: Lighting bollard

The invention relates to a light bollard with an electrical light source which is arranged in a closed, column-like bollard housing which has at least one light window through which the light of the light source exits essentially horizontally.

In addition to the light bollards that can be connected to electrical supply networks (DE-GM 1 791 210, DE 42 01 315 Al, DE 89 11 880 Ul, FR 2 534 290), which are used to illuminate traffic areas and where the energy requirements of their lamps play only a minor role, there are also light bollards that are powered by solar energy (HACH catalog Spring/Summer 2000, page 353). These are equipped with a 5 watt halogen lamp that is arranged inside a thin-walled glass cylinder. Above the glass cylinder there is a radially projecting, umbrella-like attachment with a horizontal end surface in which solar cells are arranged.

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The lamp can be switched on and off using a motion detector to minimize energy consumption. The entire lamp head is attached to a support pole, which makes it possible to position the light pole along garden paths.

Solar outdoor lights are also shown, in which the solar cells are arranged in the upper end surfaces of cylindrical housings that are inclined at 45° to the horizontal. These housings are also equipped with posts that allow them to be set up along walkways in the garden.

These well-known light bollards are not suitable for public traffic areas. The visible light emitted is too weak because only a small proportion of the light generated is radiated outwards. On the other hand, the electrical energy required is too great to generate a sufficient amount of solar energy even in weak daylight to operate the light source with the required luminosity throughout an entire winter night. In addition, these well-known solar lights have a structure that is too light, i.e. not sufficiently robust, which requires careful and gentle handling and treatment. Light bollards for public traffic areas must, on the other hand, be

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be resistant to external influences and also withstand certain mechanical impacts.

The invention is based on the object of creating a lighting bollard of the type mentioned at the beginning which is suitable for public traffic zones and which has a peripheral section which is clearly visible even from a distance and which has minimal energy consumption in weak daylight, but especially in the dark, as an orientation aid, especially for pedestrians.

This object is achieved according to the invention in that the light source is arranged in the center of a flat light guide body made of translucent material, the light exit surface of which is arranged in the peripheral region of the bollard housing and the essentially parallel flat surfaces of which are at least almost completely mirrored.

The particular advantage of the light polisher constructed in this way is that the element emitting the light is integrated into the contour of the bollard body in such a way that it is hardly affected by external influences, even violent external influences.

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damaged and yet is still able to emit so much light in the dark that people can orient themselves even from a great distance.

The structure is also relatively simple and robust. In addition, such a bollard can also have an attractive appearance.

The design according to claim 2 is important in that the light guide body is hardly visible during the day and also gives the impression of being an invulnerable part of the robust bollard housing at night.

Since the light sources in luminaires have to be replaced from time to time, it is advantageous if the light bollard is designed according to claim 3, because this allows the light guide body to be made easily accessible, so that no complicated measures have to be taken when carrying out repair work inside the light bollard.

While the design according to claim 4 enables a very simple assembly and disassembly of the light body in the bollard housing, the design according to claim

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According to claim 5, the escape of light from the light guide body can be prevented in sections.

The embodiment according to claim 6 makes it possible to produce such opaque sections of the light guide body.

The design according to claim 7 not only gives the head part of the light bollard a pleasing appearance but also offers the possibility, in conjunction with the design according to claim 8, of arranging the fastening screws in a hidden manner so that they cannot be easily recognized from the outside.

The embodiment according to claim 9 provides a simple possibility of fastening the light bollard head to a standpipe, which can have the most suitable height for the intended purpose.

The design according to claim 10 is also very important in that it ensures that even with relatively weakly charged power sources an optimal

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Light output is achieved, whereby it is also important according to claim 11 that all of the light generated is guided within the light guide body to its outer contour, where it can visibly emerge. By using light-emitting diodes, so-called LEDs, a considerably longer service life of 100,000 hours and more is achieved, so that the light bollard according to the invention can be operated maintenance-free for years.

While the embodiments according to claims 12 and 13 relate to advantageous electrical devices which contribute to optimizing the light output with minimal power consumption, the embodiment according to claim 14 achieves an optimal arrangement both with regard to light absorption and with regard to the protection of the solar cells, which are very sensitive to mechanical influences.

The invention is explained in more detail below with reference to the drawing. It shows:

Fig. 1 a light bollard in perspective view;

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Fig. 2 the head part of the light bollard in a vertical sectional view;

Fig. 3 shows the light guide body as an individual part in a greatly enlarged perspective view;

Fig. 4 shows a section IV-IV of Fig. 3;

Fig. 5 shows an enlarged view of the central section of the light guide body in section;

Fig. 6 a central section of the light guide body in bottom view without mirror foil;

Fig. 7 shows a partial section VII-VII of Fig. 6;

Fig. 8 a light guide body that only has segment-like

light exit surfaces, with a matching ring body.

The light bollard 1 provided with an electric light source 5 has a column-like bollard housing 2 which is closed all around and in whose head part 3 the light source 5 is arranged. This head part 3 has a light window 6 through which the light from the light source 5 can emerge essentially horizontally.

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The light source 5 is arranged in the form of several light-emitting diodes 50, 51 and 52 in the center of a flat light guide body 10 made of translucent material, the light exit surface 11 of which lies in the peripheral area of the bollard housing 2. The light guide body 10 consists of a circular, flat disc made of acrylic glass with the outer diameter D of the bollard housing 2, the thickness d of which can be between 8 mm and 12 mm. Of course, other dimensions are also conceivable.

The light exit surface 11 is the peripheral surface of the circular, cylindrical disk, which has two parallel flat surfaces 12 and 13 that are completely mirrored. This means that they are each covered with a mirror film 14, 15, for example made of high-gloss aluminum, which does not allow any light to escape inside the housing but ensures that all light from the light source 5 with the at least three light-emitting diodes 50, 51 and 52 is transported in a radial direction to the cylindrical light exit surface 11.

It is readily apparent from Fig. 1 and 2 that the diameter D of the disc-shaped light guide body 10 is the same size as the diameter of the bollard housing 2. This ensures that the

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The light guide body 10 and the bollard housing 2 have the same circumferential contour.

For reasons of visual appearance only, the two ring bodies 25 and 26 are each provided with a ring fold 43 and 44 in the area of their outer edges facing the light guide body 10. This optically conceals any differences in diameter between the light guide body 10 and the ring bodies 25 and 26 that may occur due to manufacturing tolerances.

As can best be seen from Fig. 2, the light guide body 10 is arranged between two separate ring bodies 25 and 26 which are connected in a concentric arrangement and can be detached by fastening screws 20 and which are each provided with sealing rings 21 and 22 resting on the light guide body 10 outside the fastening screws 20. The ring body 25 arranged above the light guide body 10 has an inner ring collar 18 which is provided with corresponding threaded holes for receiving the fastening screws 20.

The light guide body 10, which has the shape of an annular disk, is provided with three through holes 9 arranged near the edge at corresponding angular distances to accommodate the fastening screws 20.

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Another through hole 7 of the light guide body 10, arranged near the center, serves to guide electrical cables 57.

As can be readily seen, the guide body 10 assumes a horizontal position in the vertical bollard housing 2.

The lower ring body 26 carrying the light guide body 10 has a ring wall 24 which is offset radially inward relative to the ring wall 23 of the upper ring body 25 and which is provided with an outwardly projecting upper ring flange 27. The outer contour 28 of this ring flange 27 corresponds to that of the light guide body 10 and at the same time also to that of the upper ring body 25.

Since the upper ring body 25, the light guide body 10 and the lower ring body 26 are each cylindrical and arranged coaxially to one another, which is indicated by the common axis 8, the light guide body 10 is completely spatially integrated in the head part 3 of the light polisher 1.

The ring flange 27 of the lower ring body 26 is provided with an annular groove 30 on the underside, which serves for countersunk

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Serves to accommodate the screw heads 19 of the fastening screws 20.

The lower end of the ring body 26 is provided with a radially projecting ring collar 29, which has a tapered cylindrical projection 32, which is centered by the upper end 36 of a standpipe 31 forming the column body of the light bollard. Radial clamping screws 42 are provided for the secure connection of the standpipe 31 to the ring collar 29.

As already mentioned, a total of three light-emitting diodes 50, 51 and 52 are used as the light source, which are housed in three tunnel-like cavities 55, 56 and 57 arranged in a star shape and connected to one another in the center. These cavities 55 and 57, which are open on the underside, together form the recess 54, which is covered by the mirror film 13 arranged on the underside. The light-emitting diodes 51, 52 and 53 are arranged in a horizontal position, i.e. with body axes 50', 51' and 52' running parallel to the flat sides of the disk-like light guide element 10, and are each radially aligned at angular intervals of 120°. Due to the natural scattering with which these light-emitting diodes 50, 51 and 52 emit their light,

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the cylindrical peripheral surface 11 of the light guide body 10 appears as a ring-shaped light band.

It goes without saying that instead of the three light-emitting diodes 50, 51 and 52 present here, for example, several such light-emitting diodes can be arranged in a star shape in the center of the light guide body 10 at correspondingly smaller angular distances.

These light-emitting diodes 50, 51 and 52, which together form the light source 5, are fed by an accumulator 40, which in turn is charged by solar cells. These solar cells are arranged in a cover plate 37 which is inclined by approximately 20° with respect to the horizontal 35 and which is located above the light guide body 10 and forms the upper end of the bollard housing 2.

The accumulator 40 is arranged together with an electronic control unit 41 with twilight switch in the cavity 33 of the ring body 26 carrying the light guide body 10 on a base plate 34 fastened thereto.

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The cover plate 37 in turn consists of two acrylic glass plates 38 and 39 which are tightly connected to one another at least in the edge region and to the ring wall 23 of the ring body 25. A solar cell module 45 in the form of a flat disk is inserted between these two acrylic glass plates 38 and 39 and is cast all around by means of a sealing ring 46.

Fig. 8 shows another embodiment of the light guide body 10. This light guide body 10' consists of a circular acrylic glass pane which is provided on its circumference with a plurality of ring sector-like incisions 59 into which correspondingly designed axial projections 60 of the upper ring body 25' engage, so that no light can escape in the area of these incisions or projections 60.

Instead of a closed light band running all the way around, this creates short light bars to which traffic-related information could possibly be assigned.

Otherwise, the light guide body 10' is designed in the same way as the light guide body 10.

Claims (14)

1. Lighting bollard ( 1 ) with an electric light source ( 5 ) which is arranged in a closed, column-like bollard housing ( 2 ) which has at least one light window ( 6 ) through which the light from the light source ( 5 ) exits essentially horizontally, characterized in that the light source ( 5 ) is arranged in the center of a flat light guide body ( 10 , 10 ') made of translucent material, the light exit surface ( 11 ) of which is arranged in the peripheral region of the bollard housing ( 2 ) and the essentially parallel flat surfaces ( 12 , 13 ) of which are at least almost completely mirrored. 2. Light bollard according to claim 1, characterized in that the light guide body ( 10 ) consists of an acrylic glass pane which has at least approximately the same circumferential contour as the adjacent areas of the bollard housing ( 2 ). 3. Light bollard according to claim 1, characterized in that the light guide body ( 10 , 10 ') is arranged between two separate ring bodies ( 25 , 26 ) which are detachable by fastening screws ( 20 ) and connected to one another in a concentric arrangement and which are each provided with sealing rings ( 21 , 22 ) resting on the light guide body ( 10 ). 4. Lighting bollard according to claim 3, characterized in that the light guide body ( 10 , 10 ') assumes a substantially horizontal position in the vertical bollard housing ( 2 ). 5. Lighting bollard according to claim 3 or 4, characterized in that the peripheral surface ( 11 ) of the light guide body ( 10 ) is partially covered in an opaque manner. 6. Light bollard according to claim 5, characterized in that the light guide body ( 10 ') has on its circumference one or more ring sector-like recesses ( 16 ) into which axially projecting ring wall sections ( 17 ) of one of the ring bodies ( 25 , 20 ) protrude. 7. Lighting bollard according to claim 3 or 4, characterized in that the lower ring body ( 26 ) carrying the light guide body ( 10 , 10 ') has a ring wall ( 24 ) which is offset radially inwards with respect to the ring wall ( 23 ) of the upper ring body ( 25 ) arranged above it and has an outwardly projecting upper ring flange ( 27 ) whose outer contour ( 28 ) corresponds to that of the light guide body ( 10 , 10 ') or of the upper ring body ( 25 ). 8. Lighting bollard according to claim 7, characterized in that the annular flange ( 27 ) is provided on the underside with an annular groove ( 30 ) for countersunk reception of the screw heads ( 19 ) of the fastening screws ( 20 ). 9. Lighting bollard according to claim 7, characterized in that the lower ring body ( 26 ) is fastened to the upper end of a standpipe ( 31 ) by means of an annular collar ( 29 ). 10. Light bollard according to one of claims 1 to 6, characterized in that the light source ( 5 ) consists of one or more light-emitting diodes ( 50 , 51 , 52 ) which are arranged in a central recess ( 54 ) of the central region of the light guide body ( 10 , 10 ') such that their body axes ( 50 ', 51 ', 52 ') run parallel to the flat sides of the light guide body ( 10 , 10 ') and their beam directions are aligned radially. 11. Lighting bollard according to claim 10, characterized in that the central recess ( 54 ) of the light guide body ( 10 , 10 '), which is only open on the underside, is closed by means of a mirrored cover ( 15 ). 12. Light bollard according to one of claims 1 to 11, characterized in that the light source ( 5 ) is electrically fed by an accumulator ( 40 ) which is charged by solar cells which are arranged in a cover plate ( 37 ) of the bollard housing ( 2 ) which is inclined relative to the horizontal ( 35 ) and arranged above the light guide body ( 10 , 10 '). 13. Light bollard according to claim 12, characterized in that the accumulator ( 40 ) and an electronic control unit ( 41 ) with twilight switch are arranged in the cavity ( 33 ) of the ring body ( 26 ) carrying the light guide body ( 10 , 10 ') on a base plate ( 34 ) fastened thereto. 14. Lighting bollard according to claim 12, characterized in that the cover plate ( 37 ) consists of two acrylic glass plates ( 38 , 39 ) which are tightly connected to one another at least in the edge region and to the annular wall ( 23 ) of the annular body ( 25 ), between which a solar cell module ( 45 ) in the form of a flat disk is inserted.