Light

Abstract

The invention relates to a luminaire (10), in particular a pendant luminaire, with a luminaire housing (12) and a luminaire body (14), wherein the luminaire body (14) can be suspended from the luminaire housing (12) by means of several, in particular two, suspension devices (16a, 16b) at a distance (A) and an electric height adjustment device (100) by means of which the distance (A) can be changed to adjust the height of the luminaire body (14) of the luminaire (10).

Description

[0001] The invention relates to a luminaire, in particular a pendant luminaire, having a luminaire housing and a luminaire body, wherein the luminaire body can be attached to the luminaire housing by means of several, in particular two, suspension devices suspended at a distance therefrom, and an electrical height adjustment device by means of which the distance can be changed to adjust the height of the luminaire body of the luminaire.

[0002] Generic luminaires, especially pendant luminaires, are often used to illuminate living spaces and furnishings such as furniture. It is particularly advantageous if the lamp body is height-adjustable, allowing the luminaire to be individually adapted to different lighting scenarios, for example, allowing furniture of different sizes to be optimally illuminated.

[0003] Height adjustment devices used for height adjustment are often composed of numerous mechanical and electrical components to achieve the desired height adjustment. Careful selection and precise coordination of the installed mechanical and electrical components is necessary to ensure flawless operation and a long service life of the height adjustment device. However, robust components are often very costly and increase the weight of the luminaire, making handling uncomfortable, especially when mounting the luminaire on a ceiling. High-quality height adjustment devices are therefore often very expensive and heavy. In contrast, cheaper and lighter versions of height adjustment devices often have a short service life and are often noisy and unreliable in operation.

[0004] The object underlying the invention is therefore to improve the reliability and durability of height adjustment devices for luminaires while simultaneously reducing costs.

[0005] The object is achieved with a luminaire of the type mentioned at the outset, wherein the electrical height adjustment device has a transmission mechanism with at least one belt drive comprising a belt, a drive body and an output body.

[0006] An electric height adjustment device featuring a transmission mechanism with a belt drive can resolve the conflict between an expensive, high-quality height adjustment device and a cheap, low-quality height adjustment device for lights. Belt drives are simple in design and inexpensive. At the same time, their numerous advantages ensure reliable and long-lasting operation of the height adjustment device. Belt drives are subject to very little wear and require extremely little maintenance. In addition, belt drives operate very quietly, thus contributing to the smooth operation of the height adjustment device. Their low weight also reduces the overall weight of the light, which simplifies installation in particular, but also, for example, the transport of lights with belt-driven height adjustment devices.Furthermore, belt drives can be operated at a high speed, so that the adjustment of the height of the luminaire body is significantly accelerated in contrast to height adjustment devices without a belt drive, thus also positively influencing the comfort and user-friendliness of the luminaire.

[0007] The luminaire can preferably be mounted on a room ceiling or an object, for example, a piece of furniture, by means of the luminaire housing. The luminaire body preferably comprises at least one electric light source for illuminating a room and / or an object. The suspension devices are preferably designed as cables, for example, as metal cables. The luminaire preferably comprises an electronic control device for controlling the height adjustment device and / or the electric light source, in particular by means of a remote control and / or by means of a smart device, for example, a smartphone. The control device can comprise a data memory for storing defined heights of the luminaire body and / or defined lighting states of the light source.In addition, the luminaire preferably comprises a power supply device, in particular a power supply unit, by means of which the height adjustment device and / or the control device and / or the electrical lighting means are supplied with electrical energy. The height adjustment device, the control device, the power supply device, and / or the data storage device are preferably arranged in and / or on the luminaire housing.

[0008] Preferably, the height adjustment device can be used to change the length of a section of the suspension devices extending between the lamp body and the lamp housing in order to adjust the distance between the lamp body and the lamp housing. To drive the height adjustment device, the height adjustment device preferably comprises an electric drive device, which can in particular be designed as an electric motor. The drive device can, for example, be mechanically connected to a gear, in particular to a worm gear, in order to transmit mechanical power generated by the motor. To change the distance between the lamp body and the lamp housing, the drive device of the height adjustment device is kinematically and / or kinetically coupled to the suspension devices by means of the transmission mechanism for generating an adjusting movement of the suspension devices.The drive body is preferably mechanically connected to the drive device or the gear. The drive body is preferably set in rotation by means of the drive device. The drive body can be designed as a belt pulley. By means of the drive body, a circular movement of the belt of the belt drive can be generated from the rotational movement of the drive body generated by the drive device, such that the mechanical power generated by the drive device can be transferred to the belt via the drive body. The output body can preferably be set in rotation by the circular movement of the belt and is designed to set in rotation, through its rotation, a winding device of the height adjustment device designed as a winding drum for winding and / or unwinding at least one suspension device.By winding up, the distance between the luminaire body and the luminaire housing is preferably reduced, which consequently increases the height of the luminaire body, for example above the floor or a piece of furniture. By unwinding, the distance between the luminaire body and the luminaire housing is preferably increased, which consequently reduces the height of the luminaire body, for example above the floor or a piece of furniture. The output body is mechanically connected to the winding device. The belt drive preferably comprises at least one tensioning pulley for tensioning the belt. The belt drive can also comprise several, in particular two, tensioning pulleys. The tensioning pulleys can be arranged opposite one another. The tensioning pulleys can also be arranged offset from one another, in particular diagonally to one another. The belt of the belt drive can, for example, be designed as a flat belt, toothed belt or V-belt.

[0009] In a preferred embodiment of the luminaire according to the invention, the drive body of the belt drive comprises a belt contact region and a toothed region. The drive body is preferably designed as a rotating body, in particular disc-shaped or wheel-shaped. The drive body is preferably a combination body that combines a gear with a pulley. The toothed region preferably comprises a plurality of teeth, prongs, and / or teeth evenly distributed over the circumference of the drive body. The toothing can, for example, be an involute toothing, a cycloidal toothing, or a helical toothing. Preferably, the belt contact region of the drive body also has a toothing to prevent slipping and / or slippage of the belt, in particular a belt designed as a toothed belt, thereby ensuring reliable power transmission between the drive body and the belt.The toothed area is preferably configured to contact an opposing toothed area, for example, of an adjacent gear, and to transmit a force and / or a movement through the meshing of the teeth of the toothed areas. Forces are preferably transmitted between the belt contact area and the toothed area of ​​the drive body.

[0010] In another preferred embodiment of the luminaire according to the invention, the belt contact region and the toothed region of the drive body are arranged coaxially to one another, wherein the belt contact region and the toothed region preferably have different diameters and / or different widths. Preferably, the belt contact region and the toothed region are arranged adjacent to one another on drive body regions arranged coaxially to one another. The belt contact region and the toothed region can be arranged at a distance from one another. The belt contact region and the toothed region can be arranged with no spacing and / or in contact with one another. Preferably, the belt contact region is arranged in a drive body region with a larger diameter than the toothed region. Furthermore, the belt contact region can have a greater width than the toothed region.The belt contact area can also be arranged in a drive body area with a smaller diameter than the toothed area. Furthermore, the belt contact area can have a smaller width than the toothed area.

[0011] In a further preferred embodiment of the luminaire according to the invention, the drive body is formed in one piece or in multiple parts, wherein the belt contact region is arranged on a first drive body element of the multiple-part drive body and the toothing region is arranged on a second drive body element of the multiple-part drive body. The belt contact region and the toothing region are integral components of a one-piece drive body. In a multiple-part drive body, the first and second drive body elements are preferably connected in a force-fitting, material-fitting and / or form-fitting manner. The first and second drive body elements can, for example, be arranged on a common shaft and connected to the shaft by means of a shaft-hub connection. The belt contact region and the toothing region are preferably designed to be torsionally rigid with respect to one another in order to transmit forces to one another essentially without loss.

[0012] In a further development of the luminaire according to the invention, the output body of the belt drive comprises a belt contact region and a toothing region. The output body is preferably designed as a rotating body, in particular disc-shaped or wheel-shaped. The output body is preferably a combination body that combines a gear with a pulley. The toothing region preferably comprises a plurality of teeth, points, and / or prongs evenly distributed over the circumference of the output body. The toothing can, for example, be an involute toothing, a cycloidal toothing, or a helical toothing. The belt contact region of the output body preferably has a toothing to prevent slipping and / or slippage of the belt, in particular a belt designed as a toothed belt, thereby ensuring reliable power transmission between the output body and the belt.The toothed area is preferably configured to contact an opposing toothed area, for example, of an adjacent gear, and to transmit a force and / or a movement through the meshing of the teeth of the toothed areas. Forces are preferably transmitted between the belt contact area and the toothed area of ​​the output body.

[0013] A light according to the invention is also advantageous in which the belt contact region and the toothed region of the output body are arranged coaxially to one another, wherein the belt contact region and the toothed region preferably have different diameters and / or different widths. Preferably, the belt contact region and the toothed region are arranged adjacent to one another on output body regions arranged coaxially to one another. The belt contact region and the toothed region can be arranged at a distance from one another. The belt contact region and the toothed region can be arranged with no spacing and / or in contact with one another. Preferably, the belt contact region is arranged in an output body region with a larger diameter than the toothed region. Furthermore, the belt contact region can have a greater width than the toothed region.The belt contact area can also be arranged in an output body area with a smaller diameter than the toothed area. Furthermore, the belt contact area can have a smaller width than the toothed area.

[0014] Furthermore, a luminaire according to the invention is preferred in which the output body is formed in one piece or in multiple parts, wherein the belt contact region is arranged on a first output body element of the multiple-part output body and the toothing region is arranged on a second output body element of the multiple-part output body. The belt contact region and the toothing region are integral components of a one-piece output body. In a multiple-part output body, the first and second output body elements are preferably connected in a force-fitting, material-fitting and / or form-fitting manner. The first and second output body elements can, for example, be arranged on a common shaft and connected to the shaft by means of a shaft-hub connection. The belt contact region and the toothing region are preferably designed to be torsionally rigid with respect to one another in order to transmit forces to one another essentially without loss.

[0015] In another preferred embodiment of the luminaire according to the invention, the height adjustment device comprises at least one deflection device with at least one deflection roller for deflecting at least one of the plurality of suspension devices. By means of the deflection roller of the deflection device, at least one suspension device can be deflected in the direction of the winding device, such that the suspension device can be aligned relative to the winding device for winding on the winding device. The deflection device is designed to change the direction of extension and / or the direction of movement of the suspension device, at least in sections. The deflection device can also comprise guide rollers in order to guide and / or support the suspension device without changing the direction of extension and / or the direction of movement of the at least one suspension device. The deflection device can comprise a plurality of deflection rollers.The deflection pulley and / or the guide pulleys are preferably rotatably mounted. The deflection pulley and / or the guide pulleys are preferably designed as a cable pulley. Preferably, the suspension device contacts the deflection pulley at least partially in the circumferential direction of the deflection pulley. Preferably, the deflection pulley is designed to change the direction of force and / or the direction of the force vector of a tensile force transmitted by means of the suspension device. Preferably, a rolling movement is carried out between the deflection pulley and the suspension device. The deflection pulley preferably comprises a guide groove and guide webs, wherein the suspension device runs through the guide groove of the deflection pulley in order to prevent the suspension device from slipping. Preferably, the suspension device is deflected between 1 degree and 180 degrees by means of the deflection pulley. Particularly preferably, the suspension device is deflected between 20 degrees and 120 degrees by means of the deflection pulley.

[0016] In a further preferred embodiment of the luminaire according to the invention, the deflection device comprises an adjustment unit by means of which the deflection device can be moved substantially perpendicular to the direction of extension of the suspension device, in particular along a linear travel path in a linear travel direction. The adjustment unit for moving the deflection device can preferably be driven by means of the output body of the belt drive, in particular by means of the toothed region of the output body, via a gear of the transmission mechanism. Preferably, force is transmitted between the toothed region of the output body and the gear, in particular a toothed region of the gear, by means of the meshing of the toothings of the output body and the gear.Preferably, the adjustment unit is configured to move the deflection device, in particular the deflection roller together with the guide rollers of the deflection device, such that the suspension device can be wound onto the winding device without knotting. Preferably, the suspension device is wound onto the winding device in this way with closely spaced and adjacent turns, without the turns crossing or overlapping. Preferably, the output body, in particular the toothed area, and the gear for driving the adjustment device together form a gear transmission, in particular with a defined gear ratio for adjusting the travel speed of the adjustment device.Preferably, a threaded rod and / or a shaft with an external thread is rotated by means of a rotational movement of the gear, wherein the deflection roller and / or the guide rollers execute a linear movement along the threaded rod and / or the shaft, in particular parallel to the direction of extension of the winding device, due to the rotation of the threaded rod and / or the shaft. The deflection roller and / or the guide rollers are preferably connected to the threaded rod and / or the shaft by means of a mounting device.

[0017] Furthermore, a luminaire according to the invention is advantageous in which the transmission mechanism comprises a second belt drive with a second belt, a second drive body, and a second output body, wherein the second belt drive is preferably driven by the meshing of the toothed region of the drive body and a toothed region of the second drive body. Preferably, the transmission mechanism of the height adjustment device comprises two belt drives, each with a separate drive belt. By means of the two belt drives, a winding device can be driven and / or a deflection device can be moved. Preferably, both belt drives can be driven by a common drive device.In order to jointly drive both belt drives, the drive body of the first belt drive is connected via its toothing area to a second drive body of the second belt drive, wherein the first drive body is set in rotation by the drive device and the second belt drive is driven by meshing with the toothing of the second drive body. The first and the second drive body preferably together form a gear transmission with a defined gear ratio. Preferably, a first suspension device can be wound up and / or unwound by the first belt drive and a second suspension device can be wound up and / or unwound by the second belt drive. Preferably, the structure of the second belt drive is substantially identical to the first belt drive, wherein the second belt drive can be arranged mirror-symmetrically and / or offset to the first belt drive.The height adjustment device preferably comprises a transmission mechanism with a combined belt-gear drive for driving at least one winding device and for moving at least one deflection device. The combined belt-gear drive preferably comprises two belt drives, each with a separate winding device and deflection device, so that two suspension devices of the luminaire can be adjusted, in particular simultaneously and jointly, by means of the height adjustment device to adjust the height of the luminaire body.

[0018] Preferred embodiments of the invention are explained and described in more detail below with reference to the accompanying drawings. Fig. 1 shows a luminaire according to the invention with a height adjustment device in a perspective view; Fig. 2 shows the height adjustment device of the luminaire according to the invention in a perspective view from above; Fig. 3 shows a perspective detailed view of an output body and a gear of the height adjustment device; and Fig. 4 shows a perspective detailed view of drive bodies of the height adjustment device.

[0019] The Fig. 1shows a luminaire 10 according to the invention with a luminaire housing 12 and a luminaire body 14. The luminaire body 14 is suspended from the luminaire housing 12 at a distance A by means of suspension devices 16a, 16b. The suspension devices 16a, 16b are designed as flexible, bendable, and tensile-resistant cables, in particular as steel cables, which can be braided or twisted together from several fibers or wires. The cables can also be made of natural fibers or plastic, for example. In addition, the suspension devices 16a, 16b can be designed as chains. By means of the luminaire housing 12, the luminaire 10 can be mounted, for example, on a ceiling, in particular in living spaces.The luminaire body 14 can comprise, in particular on its underside, electrical lighting means, in particular one or more LEDs and / or RGB LEDs, for illuminating rooms and / or objects, wherein the brightness and / or the color of the LEDs can be adjustable.

[0020] The luminaire 10 comprises a height adjustment device 100, which is arranged in the luminaire housing 12. Furthermore, in other embodiments of the luminaire 10, the height adjustment device 100 can also be arranged on the luminaire body 14 of the luminaire 10. The luminaire housing 12 can also be closed by means of one or more cover panels for covering the electrical and / or mechanical luminaire components, in particular the height adjustment device 100, thereby protecting them from environmental influences and improving the external appearance of the luminaire 10. The height adjustment device 100 allows the distance A between the luminaire housing 12 and the luminaire body 14 to be continuously varied. By changing the distance A, the height of the luminaire body 14 can be flexibly adjusted in a room and / or above an object, for example a table.

[0021] The Fig. 2shows the height adjustment device 100 of the luminaire 10 with partially concealed housing parts of the luminaire housing 12 in a perspective view from above. By means of the height adjustment device 100, the suspension devices 16a, 16b are wound onto winding devices 120a, 120b designed as drums and / or unwound from the winding devices 120a, 120b. When the suspension devices 16a, 16b are wound up, the distance A between the luminaire housing 12 and the luminaire body 14 is reduced. By unwinding the suspension devices 16a, 16b, the distance A is increased.

[0022] The height adjustment device 100 is driven by a drive device 102, wherein the drive device 102 is designed, in particular, as an electric motor. By means of a gear 104, which may be designed, for example, as a worm gear, and a transmission mechanism 106, the force and / or movement generated by the drive device 102 is transmitted to the winding devices 120a, 120b for winding and / or unwinding the suspension devices 16a, 16b and for driving adjustment units 128a, 128b.

[0023] The height adjustment device 100 also comprises a control device 18 and a power supply device 20. The height adjustment device 100 can be controlled by the control device 18 to change the distance A between the luminaire housing 12 and the luminaire body 14. In particular, the control device 18 can be suitable for manually and / or automatically remotely controlling the height adjustment device 100 and / or the electrical illuminants of the luminaire 10 using a remote control and / or an external electronic device, for example a smartphone, and / or for integrating the luminaire 10 into a SMART home environment. The control device 18, the height adjustment device 100, and the illuminants are supplied with electrical energy by a power supply unit 20. The power supply unit 20 is designed as a power supply unit.The energy supply unit 20 can also be designed as an energy storage device, in particular as an electrochemical energy storage device, such as a battery or accumulator. The drive device 102 is electrically connected to the energy supply unit 20 for supplying electrical energy and / or is connected to the control device 18 for controlling purposes.

[0024] To transmit the force and / or movement generated by the drive device 102, the transmission mechanism 106 comprises two belt drives 108a, 108b, each belt drive 108a, 108b comprising a belt 110a, 110b. The belts 110a, 110b are preferably designed as toothed belts. Furthermore, the belts 110a, 110b can be designed, for example, as V-belts, flat belts, or ribbed belts. To achieve sufficient belt tension to ensure reliable power transmission via the belts 110a, 110b, the belts 110a, 110b are tensioned by means of tension pulleys 115. The tension pulleys 115 can be fixedly or spring-loaded and are arranged on the outer side of the belt. In addition, the belts 110a, 110b are guided by means of the tension pulleys 115, changes in the length of the belts 110a, 110b are compensated and vibrations in the belt drives 108a, 108b are reduced.

[0025] The belt drive 108a comprises a drive body 112a, wherein the belt 110a contacts the drive body 112a in a belt contact area 116 in sections along the circumference of the disk-shaped drive body 112a. The drive body 112a is kinetically and / or kinematically connected to the drive device 102 via the gear 104, so that the drive body 112a is set in rotation by the drive device 102. The rotation of the drive body 112a sets the belt 110a in motion, whereby a movement and / or force transmission takes place from the drive body 112a to the belt 110a.

[0026] By means of the belt 110a, the force and / or movement generated by the drive device 102 is transmitted via the drive body 112a to an output body 114a of the belt drive 108a. The belt 110a contacts the output body 114a in a belt contact area 116 in sections along the circumference of the disc-shaped output body 114a. The movement of the belt 110a causes the output body 114a to rotate, whereby a movement and / or force transmission takes place from the belt 110a to the output body 114a.

[0027] The output body 114a is kinematically and / or kinetically connected, for example, by means of a shaft, to the winding device 120a, wherein the winding device 120 is also set in rotation by the rotation of the output body 114. Due to the rotation of the winding device 120a, the suspension device 16a is wound onto the winding device 120a or unwound from the winding device 120a, depending on the direction of rotation.

[0028] In addition, the rotation of the output body 114a drives a gear 130a arranged adjacent to the output body 114a. The output body 114a comprises a toothed region 118 with teeth evenly distributed over the circumference of the output body 114a, which mesh with the teeth of the gear 130a. Through the rotation of the output body 114a and the meshing of the teeth, the movement and / or force is transferred to the gear 130a, which consequently also causes it to rotate. The gear 130a, in turn, is kinematically and / or kinetically connected to an adjusting unit 128a designed as a shaft, wherein the adjusting unit 128a is rotated by the rotation of the gear 130a.

[0029] A deflection device 122a of the height adjustment device 100 is movable by means of the adjustment unit 128a. The deflection device 122a is configured to change the direction of extension and / or movement of the suspension devices 16a so that the suspension devices 16a are aligned to match the winding device 120a. The deflection device 122a comprises a deflection roller 124a for aligning the suspension device 16a. The deflection roller 124a has a guide groove through which the suspension device 16a can move during winding and / or unwinding by a rotational movement of the winding device 120a. The guide groove prevents the suspension device from slipping off the deflection roller 124a. The deflection roller 124a is rotatably mounted on a fastening element of the deflection device 122a.

[0030] The adjustment unit 128a for moving the deflection device 122a is designed as a shaft having a thread on its outer circumferential surface. The adjustment unit 128a, designed as a shaft, is driven and rotated by the gear 130a. The rotation of the adjustment unit 128a causes the deflection device 122a to perform a linear movement in a travel direction V along the axial extension of the adjustment unit 128a, parallel to the axial extension of the winding device 120a. In this way, the position of the deflection device 122a relative to the winding device 120a is changed such that the suspension device 16a is wound onto the winding device 120a in adjacent and closely spaced windings, preventing overlap of the windings.

[0031] The belt drive 108b of the transmission mechanism 106 has a substantially identical structure and a substantially identical mode of operation as the belt drive 108a, wherein the belt drive 108b is arranged mirror-symmetrically and slightly offset upwards to the belt drive 108a.

[0032] The belt drive 108b has a drive body 112b that is essentially identical in structure to the drive body 112a and arranged adjacent to the drive body 112a. Both drive bodies 112a, 112b each have a toothed area 118. The teeth, evenly distributed over the circumferential surfaces of the drive bodies 112a, 112b, mesh with one another, so that the drive body 112b is driven and also set in rotation when the drive body 112a rotates. In this way, the belt drive 108b is driven simultaneously with the belt drive 108a by the drive device 102 through a kinematic and / or kinetic connection between the drive bodies 112a, 112b, thereby setting the belt 110b in motion.

[0033] The belt drive 108b comprises an output body 114b, which has the same structure as the output body 114a. The output body 114b is rotated by the belt 110b, thereby driving a winding device 120b for winding and / or unwinding the suspension device 16b. A deflection device 122b positions the suspension device 16b relative to the winding device 120b by means of a deflection pulley 124b. An adjustment unit 128b, which is driven by a gear 130b, moves the deflection device 122b linearly parallel to the extension direction of the winding device 120b, so that the suspension device 16b can be wound onto the winding device 120b without overlapping and unwound without knotting.The gear 130 engages with its teeth in a toothed area 118 of the output body 114b, so that the gear 130b is also set in rotation when the output body 114 rotates and the adjustment unit 128b is driven accordingly.

[0034] The belt drives 108a, 108b with the drive bodies 112a, 112b and the output bodies 114a, 114b, together with the gears 130a, 130b, form the transmission mechanism 106, which is designed as a combined belt-gear drive. Due to the two essentially identically functioning belt drives 108a, 108b, the mirror-symmetrical design of the transmission mechanism 106, and the coupling of the belt drives 108a, 108b through the intermeshing of the gears of the drive bodies 112a, 112b, two winding devices 120a, 120b and two adjustment units 128a, 128b for the deflection devices 122a, 122b can be driven simultaneously, jointly, and synchronously with a single drive device 102. In this way, the suspension devices 16a, 16b can be wound up and unwound together at the same time and evenly.

[0035] The Fig. 3shows the winding device 120a, which is set in rotation by the output body 114a, as well as the deflection device 122a with the adjustment unit 128b, which is driven by the gear 130a, in a detailed view. The structure and function of the Fig. 3 The components of the height adjustment device shown correspond to the structure and function of the winding device 120b, the output body 114b, the adjustment unit 128b, the deflection device 122b and the gear 130b.

[0036] The output body 114a has a belt contact area 116 and a toothed area 118 and is accordingly designed as a one-piece and torsionally rigid combination body consisting of a toothed pulley and a gear. To improve power transmission and to prevent slippage and / or slippage of the belt 110a, the belt contact area 116 is toothed. The toothing of the belt contact area 116 is designed such that the toothing engages a tooth structure of the belt 110a, which is designed as a toothed belt. In the belt contact area 116, the belt 110a contacts the output body 114a over part of its circumference and transmits a force from the belt 110a to the output body 114a, causing the output body 114a to rotate. The toothing region 118 is arranged coaxially and without a spacing from the belt contact region 116, wherein the toothing region 118 has a larger diameter.The teeth, evenly distributed over the circumference of the toothed area 118, engage the teeth of the adjacent gear 130a, which is driven by the rotation of the output body 114a, so that the adjustment unit 128a, through rotation, causes a linear movement of the deflection device 122a in the travel direction V. The deflection device 122a and the deflection device 122b (not shown) each comprise a guide roller 126, which is partially concealed by the gear 130a in this view. The guide rollers 126 guide the respective suspension device 16a, 16b and thread it correctly into the respective deflection roller 124a, 124b.

[0037] The Fig. 4shows a detailed view of the drive bodies 112a, 112b, which each drive the belt drives 108a, 108b. The drive bodies 112a, 112b each have a belt contact area 116 and a toothed area 118b, so that the drive bodies 112a, 112b are each designed as a one-piece and torsionally rigid combination body consisting of a toothed pulley and a gear. To improve power transmission and to prevent slippage and / or slippage of the belts 110a, 110b, the belt contact areas 116 are toothed. The toothing of the belt contact areas 116 is designed such that the toothing engages a tooth structure of the belts 110a, 110b designed as toothed belts. In the belt contact areas 116, the belts 110a, 110b contact the respective drive body 112a, 112b over part of their circumference.The toothed areas 118 are each arranged coaxially and without a gap to the belt contact areas 116, with the toothed areas 118 each having a larger diameter than the belt contact areas 116. The drive body 112a is set in rotation by the drive device 102. The rotation sets the belt 110a in motion.On the other hand, the rotation of the drive body 112a simultaneously sets the adjacent drive body 112b in rotation, since the teeth of the drive body 112a, which are evenly distributed over the circumference of the toothed areas 118, engage with the teeth of the adjacent drive body 112b, so that the belt drive 108b is driven by the meshing of the toothed areas of the drive bodies 112a, 112b and in this way a kinematic and / or kinetic coupling of the belt drives 108a, 108b and the gears 130a, 130b to a common transmission mechanism 106 of the height adjustment device is realized by the drive bodies 112a, 112b. Reference symbol

[0038] 10Luminaire 12Luminaire housing 14Luminaire body 16a, 16bSuspension devices 18Control device 20Power supply unit 100Height adjustment device 102Drive device 104Gearbox 106Transmission mechanism 108a, 108bBelt drives 110a, 110bBelts 112a, 112bDrive body 114a, 114bOutput body 115Tensioning pulleys 116Belt contact areas 118Gearing areas 120a, 120bWinding devices 122a, 122bDeflection devices 124a, 124bDeflection pulleys 126Guide pulleys 128a, 128bAdjustment units 130a, 130bGears ADistance VTravel direction

Claims

1. A luminaire (10), in particular a pendant luminaire, comprising - a luminaire housing (12) and a luminaire body (14), wherein the luminaire body (14) can be suspended from the luminaire housing (12) by means of several, in particular two, suspension devices (16a, 16b) at a distance (A); and - an electric height adjustment device (100), by means of which the distance (A) can be changed to adjust the height of the luminaire body (14) of the luminaire (10), characterized in that the electric height adjustment device (100) has a transmission mechanism (106) with at least one belt drive (108a, 108b) comprising a belt (110a, 110b), a drive body (112a, 112b) and an output body (114a, 114b).

2. Lamp (10) according to claim 1, characterized in that the drive body (112a, 112b) of the belt drive (108a, 108b) comprises a belt contact area (116) and a toothing area (118).

3. Lamp (10) according to claim 2, characterized in thatthe belt contact region (116) and the toothed region (118) of the drive body (112a, 112b) are arranged coaxially to one another, wherein the belt contact region (116) and the toothed region (118) preferably have different diameters.

4. Lamp (10) according to claim 2 or 3, characterized in that the drive body (112a, 112b) - is formed in one piece, or - is formed in several parts, wherein the belt contact region (116) is arranged on a first drive body element of the multi-part drive body (112a, 112b) and the toothing region (118) is arranged on a second drive body element of the multi-part drive body (112a, 112b).

5. Luminaire (10) according to one of the preceding claims, characterized in that the output body (114a, 114b) of the belt drive (108a, 108b) comprises a belt contact area (116) and a toothing area (118).

6. Lamp (10) according to claim 5, characterized in thatthe belt contact region (116) and the toothed region (118) of the output body (114a, 114b) are arranged coaxially to one another, wherein the belt contact region (116) and the toothed region (118) preferably have different diameters.

7. Lamp (10) according to claim 5 or 6, characterized in that the output body (114a, 114b) - is formed in one piece, or - is formed in several parts, wherein the belt contact region (116) is arranged on a first output body element of the multi-part output body (114a, 114b) and the toothing region (118) is arranged on a second output body element of the multi-part output body (114a, 114b).

8. Luminaire (10) according to one of the preceding claims, characterized in that the height adjustment device (100) comprises at least one deflection device (122a, 122b) with at least one deflection roller (124a, 124b) for deflecting at least one of the plurality of suspension devices (16a, 16b).

9. Lamp (10) according to claim 8, characterized in that the deflection device (122a, 122b) comprises an adjusting unit (128a, 128b) by means of which the deflection device (122a, 122b) can be moved substantially perpendicular to the direction of extension of the suspension device (16a, 16b), in particular along a linear travel path in a linear travel direction (V), wherein the adjusting unit (128a, 128b) for moving the deflection device (122a, 122b) can be driven via a gear wheel (130a, 130b) of the transmission mechanism (106), preferably by means of the output body (114a, 114b) of the belt drive (108a, 108b), in particular by means of the toothed region (118) of the output body (114a, 114b).

10. Luminaire (10) according to one of the preceding claims, characterized in thatthe transmission mechanism (106) comprises a second belt drive (108b) with a second belt (110b), a second drive body (112b) and a second output body (114b), wherein the second belt drive (108b) is preferably drivable by intermeshing of the toothed region (118) of the drive body (112a) and a toothed region (118) of the second drive body (112b).

Images