Lamp, in particular floor lamp or desk lamp

Abstract

The invention relates to a lamp (1) having a lamp base (20), a lamp head (10) and an arm (40) interconnecting the lamp base (20) and the lamp head (10). Simple adjustability of the lamp head (10) with respect to the lamp base (20) is achieved in that a slide (50), which is adjustable along a longitudinal axis (48) of the arm (40), is provided and that by means of the slide (50) a second longitudinal portion (40.2) of the arm (40) can be angled with respect to a first longitudinal portion (40.1) of the arm (40) in the region of the slide (50) by means of an elastic deformation of the arm (40).

Description

[0001] Lamp, especially floor or table lamp

[0002] The invention relates to a luminaire, in particular a floor-standing or table luminaire, having a luminaire base, a luminaire head and an arm connecting the luminaire base and the luminaire head, wherein the arm has a flat first side and an opposite flat second side, wherein the first side and the second side each have a longitudinal extension in the direction of a longitudinal axis of the arm and a transverse extension in a direction perpendicular to the longitudinal axis, wherein the longitudinal extension is greater than the transverse extension, and wherein preferably the longitudinal extension and the transverse extension are each greater than a thickness of the arm measured between the first and the second side.

[0003] US 4,706,172 A discloses an angle- and height-adjustable lamp. The base of the lamp has a housing, from the interior of which an extendable arm of the lamp extends. The arm can be extended from the housing by a variable length, thereby adjusting the height of the lamp. A first part of the housing is rotatable relative to a second part of the housing, thereby allowing the angle of the lamp to be adjusted. The arm consists of two flexible metal strips of the type used in spooled measuring tapes or a single strip made of a flexible plastic.

[0004] The object of the invention is to provide a lamp which is characterized by the easy adjustability of the lamp head relative to the lamp base.

[0005] This object is achieved by providing a carriage which is adjustable along a longitudinal axis of the arm, and by means of the carriage a second longitudinal section of the arm can be angled relative to a first longitudinal section of the arm by elastic deformation of the arm in the region of the carriage. This makes it possible to adjust the lamp head relative to the lamp base in a simple manner by adjusting the carriage along the longitudinal axis. Such an adjustment can be carried out comfortably by a user in one movement. Particularly advantageously, the adjustment can be carried out one-handed. Furthermore, no technically complex means are required for the adjustability of the lamp head relative to the lamp base. This means that no complex adjustment mechanisms such as winding, articulated and / or telescopic mechanisms need to be provided.

[0006] Preferably, an angle formed by the first longitudinal section and the second longitudinal section due to the bending can be in the range between 90° and 180°, more preferably between 90° and 150°, particularly preferably between 90° and 120°, in particular 110°. It is conceivable for the angle to be adjustable. For example, the carriage can be provided in an interchangeable manner so that carriages can be used with which different degrees of bending can be achieved. It is also conceivable for the carriage to be adjustable so that different degrees of bending can be achieved with one carriage. For this purpose, the carriage can, for example, have an adjustment device. The second longitudinal section of the arm can be directed along the longitudinal axis from the carriage to the lamp head, and the first longitudinal section can be directed along the longitudinal axis from the carriage to the lamp base.

[0007] The longitudinal sections themselves can each run straight, ie the longitudinal axis can run straight in the region of the first longitudinal section and the second longitudinal section, apart from a slight elastic deflection due to the weight of the arm and / or the carriage and / or the lamp head.

[0008] However, due to the elastic deformation in the region of the carriage, the second longitudinal section can be angled relative to the first longitudinal section such that the longitudinal sections enclose an angle. In this case, the first side of the arm can face the interior of the angle. The illumination direction of the light head can emanate in one direction from the first side and thus, due to the angle, be directed at least partially downwards and, for example, illuminate a table surface or a floor. When adjusting the carriage, the angle between the first and second longitudinal sections can be maintained.

[0009] A flat side does not necessarily mean a flat side. Rather, a flat side can be flat or curved. A flat side can also have interruptions, such as holes.

[0010] For the purposes of the invention, a lamp base is not limited to a base that can be placed on a surface. A lamp base can also be designed, for example, as a clamp or other holding means by means of which a connection to a wall, a piece of furniture, a support rail, or the like can be established. In principle, a lamp base can be a part of the lamp with which the lamp can be positioned at least temporarily at a desired location in the room. According to an advantageous variant of the invention, it is proposed that the arm have at least one strip-shaped support element. In particular, the arm can be formed by the at least one strip-shaped support element. A strip-shaped support element can, for example, consist of a metal, in particular a steel, preferably a hardened steel. However, it is also conceivable that the strip-shaped support element can consist of a plastic.The band shape allows for an arm that is particularly elastically deformable.

[0011] The material thickness of the support element can preferably be at least 0.15 mm, particularly preferably at least 0.2 mm, in order to provide sufficient stability. The material thickness can be a thickness of the base material of the support element, in particular without taking coatings or the like into account. Depending on the weight of the carriage and / or the lamp head and the length of the arm, it can be advantageous to provide greater material thicknesses for the support element. For example, a material thickness of at least 0.3 mm or at least 0.4 mm can be provided. If more than one support element is provided, the individual support elements can, for example, have a smaller material thickness, although sufficient stability can still be achieved. For example, two support elements can be used, each having a material thickness of at least 0.15 mm or at least 0.2 mm.

[0012] The support element can extend along the longitudinal axis from a first end region to a second end region of the arm, wherein the lamp base is coupled to the arm in the first end region, and wherein the lamp head is coupled to the arm in the second end region. The support element can in particular be designed as a single piece. Accordingly, the support element can be continuous from the first to the second end region. This can initially achieve simple production and assembly. Furthermore, a continuously designed support element can contribute to easy adjustability of the carriage, since the carriage then does not have to travel over any joints during adjustment, for example. According to an advantageous development of the invention, it is proposed that the arm has two support elements which follow one another in a direction transverse to the longitudinal axis and transverse to the transverse extent.Preferably, the support elements can be arranged one after the other in a direction perpendicular to the longitudinal axis and perpendicular to the transverse extension. A bending moment acting on the arm due to the weight of the arm, the lamp head, and / or the carriage can be aligned around an axis parallel to the transverse extension. The proposed arrangement of the support elements can thus create increased bending stiffness, in particular an increased area moment of inertia, with respect to this axis.

[0013] If two support elements are provided, they can advantageously be electrically conductive. Thus, an electrical connection between a power supply and the light head can be established using the support elements. Preferably, the support elements each have an electrically insulating layer to reduce the risk of short circuits and / or electric shock. The electrically insulating layer can, for example, be a sheathing, in particular a coating.

[0014] The support elements can be connected to one another in a suitable manner. It is conceivable for the support elements to be firmly bonded, in particular glued. It is also conceivable for the support elements to be clamped together. In particular, the support elements can be clamped together in the area of ​​a connection to the lamp base and / or in the area of ​​the lamp head, for example, by means of a screw connection.

[0015] Furthermore, it can be provided that a control line for controlling a light source of the light head is routed between the support elements. For example, the light source can be an LED light source, in particular an LED strip. The light source can be controlled by means of a control line, thus enabling the control of the light intensity and / or color, if necessary. In particular, a control device for the light source can be provided.

[0016] The control line can be applied to one of the carrier elements, preferably to the insulating layer. A compact design and simple assembly can be achieved, in particular, if the control line is printed onto a carrier element. Alternatively, the control line can be designed as a cable, particularly as a flat cable.

[0017] According to an advantageous variant of the invention, it is proposed that, viewed in a cross-section perpendicular to the longitudinal axis, one of the two sides of the arm has a convex curvature and the opposite of the two sides has a concave curvature, wherein the concave and / or convex curvature is / are preferably partially circular, more preferably resulting in a curved, in particular U-shaped, cross-section of the arm. Such a cross-sectional shape can achieve sufficient flexural rigidity against bending under its own weight. Furthermore, a curved cross-section in the area of ​​elastic deformation in the region of the slide can be converted into an at least almost flat cross-section after overcoming a minimum bending moment. This almost flat cross-section in the region of the slide leads to a reduced restoring force exerted by the arm, which must be supported by the slide.This can reduce frictional forces between the arm and the carriage, allowing the carriage to be adjusted more smoothly.

[0018] If the arm consists of more than one support element, for example consists of two support elements, the first side of the arm can be formed by one side of one support element, in particular a convexly curved side, and the second side can be formed by one side of the other support element, in particular a concavely curved side, or vice versa.

[0019] Preferably, the radius of curvature of concavely curved sides of the arm or a support element can be at least ten, preferably 15 mm. An opposite convexly curved side can have a radius of curvature that is greater than that of the concavely curved side by a thickness of the arm or a material thickness of the support element.

[0020] The elastic deformation of the arm in the region of the carriage can be achieved in a simple manner in that the carriage has a first support region, a second support region and a third support region, each of which exerts a force on at least one side of the arm, and in that the elastic deformation of the arm is caused by the exerted forces.

[0021] The respective forces exerted by the support areas on the respective side can be at least partially aligned in a normal direction of the respective side.

[0022] The forces acting between the carriage and the arm can cause friction forces sufficiently large to prevent the carriage from moving automatically, in particular from falling down, for example towards the lamp base.

[0023] If it is further provided that the support areas are spaced apart from one another along the longitudinal axis, corresponding lever arms can be provided for the forces exerted by the support areas in order to be able to generate a bending moment on the arm sufficient for the angulation.

[0024] Preferably, it can be provided that the first support region and the second support region each exert a force at least on the second side of the arm, and that the third support region exerts a force at least on the first side, wherein the third support region is preferably provided along the longitudinal axis between the first and the second support region. Thus, the elastically deformed region of the arm can be viewed as analogous to a bending beam that is mounted on two bearing points (here: first and second support region) and on which a force is exerted between the bearing points (here: force of the third support region). Preferably, the first side can face an interior of the angle that the first longitudinal section and the second longitudinal section enclose due to the angulation, and the second side can face away from the interior.

[0025] A variant of the invention can be characterized in that a straight first connecting line, which connects a first replacement point of the first support region with a third replacement point of the third support region, encloses an angle with a straight second connecting line, which connects the third replacement point with a second replacement point of the second support region, which angle is greater than or equal to an angle which the first longitudinal section encloses with the second longitudinal section, wherein a replacement point of a support region is in each case a point at which a respective resulting force of the support region is effective on the first or second side.

[0026] This ensures that the elastic deformation caused by the slide on the arm assumes a degree that corresponds to the desired angle of the first to the second longitudinal section. When using larger arm thicknesses, it may be necessary to select a larger angle between the connecting lines.

[0027] The first and second support regions can be formed by a first and a second support surface, respectively, which are in contact with the second side at least in some regions. Furthermore, the third support region can be formed by a third support surface, which is in contact with the first side at least in some regions. Accordingly, the forces exerted on the arm by the support regions can be present as line and / or area loads. A replacement point of a support region can then be a point at which a respective resulting force of the support region acts on the first or second side, i.e. the equivalent replacement force of the respective line and / or area load of the support region is effective. In particular, if the band has a curved cross-sectional shape, the forces exerted by the support regions can also act at several, in particular two, points, lines or surfaces spaced apart from one another.In this case, a replacement point of a respective support area can be a replacement point of the sum of these spaced point, line and / or area loads.

[0028] Preferably, the connecting lines lie parallel to a plane spanned by the direction of the longitudinal axis in the region of the first or second arm section and the direction of the transverse extent, or in a plane that is parallel to the longitudinal axis and to a surface normal of the first or second side.

[0029] A particularly simple design for the slide is achieved if the slide comprises a housing, the housing has two openings connected by a passage, and the arm is received in the passage between the openings. Accordingly, the slide can be made, for example, from a tubular section. The tubular section can be bent to achieve the desired angulation or the desired elastic deformation of the arm.

[0030] Preferably, at least the first support region and the second support region can be formed within the passage. In particular, the first support surface and the second support surface can be formed by the passage. In this context, it is conceivable, for example, that the passage is circumferentially delimited by housing regions only in the region of the first and second support regions, and that the passage in the region between the housing regions is open at least on one side, for example, on the second side of the arm.

[0031] Preferably, the third support region is formed at the passage, in particular the third support surface is formed by the passage. If the passage is open on at least one side in the region between the housing regions, the support region can be formed on a side that is not open. In other words, the housing can also be formed from housing sections that are connected to one another. The third support region can be provided, for example, in the connecting region.

[0032] According to one variant of the invention, the carriage can have two frame parts that are spaced apart from one another in the direction of the transverse extent. In this case, the frame parts can be connected to one another by means of at least one cross-connector oriented in the direction of the transverse extent. The at least one cross-connector can comprise one of the support regions. Preferably, at least two, in particular three, cross-connectors can be provided, each comprising one of the support regions.

[0033] A compact arrangement and a material-saving design are achieved when the support area(s) are formed by a peripheral surface(s) of the cross connector(s). Thus, no additional components are required to form the support areas.

[0034] Smooth adjustment, particularly in the case of stiffer arms, can be achieved if at least one of the cross connectors has a roller body which is mounted so as to be rotatable about an axis of rotation, the axis of rotation being aligned parallel to the direction of the transverse extension, and a circumferential surface of the roller body forming the support region.

[0035] In this context, it can be provided in particular that the roller body is rotatably mounted by means of a bearing element, preferably by means of a plain or roller bearing. A simple construction can result here if a bearing pin is provided on the frame part, which is at least partially received in a bearing receptacle of the bearing element. The bearing receptacle can be formed, for example, by the inner ring of a roller bearing or the interior of a plain bearing, in particular the interior of a sliding bushing. Preferably, a receiving space can also be provided at least partially within the roller body, in which the bearing element is at least partially received. For example, a recess can be formed on the end face of the roller body, in which an outer ring of a roller bearing or an outer diameter of a sliding bushing can be received.

[0036] According to a variant of the invention, at least one of the cross-connectors can have a projection that projects beyond the / a peripheral surface of the cross-connector, and the projection can have the support region associated with the at least one cross-connector. By appropriately selecting the dimensions of the projection, an angular position of the support regions relative to one another, or of the connecting lines between the equivalent points of the support regions, can be achieved, as can a desired angle of angulation of the longitudinal sections of the arm relative to one another.

[0037] According to a variant of the invention, it can be provided that the carriage has a plate part, that the carriage has at least one arm, preferably projecting from the / a plate part, that a cross connector is held on the arm, which is aligned in the direction of the transverse extent, and that the cross connector has one of the support regions.

[0038] Preferably, the cross connector may comprise a roller body which is mounted on the boom so as to be rotatable about an axis of rotation oriented in the direction of the transverse extension and which forms the support region.

[0039] Alternatively or additionally, it can be provided that at least one of the support regions is formed by at least one projection provided on the plate part. In particular, it can be provided that the cross connector has the third support region, and that a projection is provided each having the first and second support regions.

[0040] According to an advantageous development of the invention, it is proposed that the carriage has an adjusting device, and that the position of at least one support region relative to at least one other support region can be adjusted by means of the adjusting device, wherein the position of the third support region relative to the first and / or the second support region is preferably adjustable. Thus, the angle formed by the first and second longitudinal sections of the arm can be adjusted by means of the adjusting device. Preferably, the adjusting device can enable adjustment of the at least one support region while the carriage remains arranged in a selected position along the longitudinal axis.It is conceivable that, in a carriage having at least one cross-connector, which cross-connector has a support region, the cross-connector can be adjusted in a longitudinal and / or transverse direction of the carriage by means of the adjusting device. Alternatively or additionally, it is also conceivable that, for example, frame parts of a carriage which are connected to support regions to which, for example, cross-connectors are connected which have support regions, are designed to be split and adjustable relative to one another, in particular angularly adjustable. For example, a first part of the frame part can be connected to the first support section and the third support section, and can be angularly adjustable relative to a second part of the frame part which is connected to the second support section.

[0041] In order to achieve improved smooth running of the carriage, it is proposed that at least one of the sides of the arm has a friction-reducing layer, in particular a friction-reducing coating, preferably a sliding varnish.

[0042] Alternatively or additionally, it can be provided for this purpose that the / an insulating layer provided on a support element of the arm has friction-reducing properties, in particular has a sliding coating, preferably is formed by a sliding coating.

[0043] The invention is explained in more detail below with reference to exemplary embodiments shown in the figures.

[0044] Figure 1 is a schematic perspective view of a lamp, Figure 2 is a schematic front view of an arm of a lamp,

[0045] Figure 3 is another schematic front view of an arm of a lamp,

[0046] Figure 4 is a schematic exploded view of a lamp base, an arm and a holding element,

[0047] Figure 5 schematic views of an embodiment of an arm,

[0048] Figure 6 schematic views of an embodiment of a carriage,

[0049] Figure 7 schematic views of another embodiment of a

[0050] sleigh,

[0051] Figure 8 schematic views of another embodiment of a

[0052] sleigh,

[0053] Figure 9 schematic views of another embodiment of a

[0054] sleigh,

[0055] Figure 10 schematic views of another embodiment of a carriage,

[0056] Figure 11 schematic views of another embodiment of a carriage,

[0057] Figure 12 schematic views of another embodiment of a

[0058] sled, and

[0059] Figure 13 schematic views of another embodiment of a

[0060] sled.

[0061] Figure 1 shows a schematic perspective view of a lamp 1. The illustrated embodiment can be a floor-standing or table lamp. The lamp 1 has a lamp base 20, by means of which the lamp 1 can be placed, for example, on a table or floor. Furthermore, the lamp 1 has a lamp head 10. The lamp base 20 and the lamp head 10 are connected by an arm 40.

[0062] The arm 40 can, as shown here, consist of a single band-shaped support element 45. In particular, the band-shaped support element 45 can be an elongated metal band. However, it is also conceivable for the arm 40 to consist of more than one band-shaped support element 45. For example, two or more support elements 45 can be placed on top of one another and / or connected to one another, which will be discussed in more detail later.

[0063] The arm 40 has a flat first side 43 and, opposite thereto, a flat second side 44. The arm 40 can have a first end region 41 and a second end region 42, which are opposite each other along a longitudinal axis 48 of the arm.

[0064] The arm 40 can in particular be designed such that, in a cross-section perpendicular to the longitudinal axis 48, at least one of the two sides 43, 44 has a convex or a concave curvature. As can be seen in particular from Figure 4, the first side 43 of the arm 40 can preferably have a convex curvature. The convex curvature of the first side 43 of the arm 40 can be part-circular and thus have a first radius 49.1. The second side 44 opposite the first side 43 can have a concave curvature. This can also be part-circular and have a second radius 49.2. The thickness 49.3 of the arm 40 can be measured between the first side 43 and the second side 44.

[0065] The arm 40 or the support element 45 can preferably be made of steel, in particular of hardened steel. The material thickness of a support element 45 is preferably at least 0.3 mm to ensure sufficient stability. If the arm 40 has a plurality of support elements 45, the thickness 49.3 of the arm 40 can be the sum of the material thicknesses of the support elements 45 plus any distance between them. Depending on the length of the arm 40 and the weight of the lamp head 10, greater material thicknesses of the support elements 45 or greater thicknesses of the arm can be advantageous. For example, a floor lamp can have a greater arm 40 length than a table lamp and thus require a greater thickness 49.3 or greater material thicknesses.

[0066] The first or second radius 49.1, 49.2 can be, for example, 15 mm. As is clearly evident from Figures 1 to 5, the first side 43 and the second side 44 each have longitudinal extensions that are greater than the thickness 49.3 of the arm 40. The longitudinal extension can be measured between the first end region 41 and the second end region 42. Furthermore, both sides 43, 44 each have transverse extensions that are less than the longitudinal extension. The arm 40 can thus be elongated.

[0067] The transverse extension of the arm 40 can, for example, be at least 20 mm, preferably approximately 22 mm. The longitudinal extension can be selected differently depending on the intended use, for example, as a table or floor lamp. For example, the longitudinal extension can be selected between 500 and 1000 mm. Longitudinal extensions in this range can be useful for table lamps.

[0068] As can be further seen in Figure 1, the luminaire 1 further comprises a carriage 50. The carriage 50 is adjustable along the longitudinal axis 48 of the arm 40. By means of the carriage 50, a second longitudinal section 40.2 of the arm 40 can be angled relative to a first longitudinal section 40.1 of the arm 40. Accordingly, the longitudinal axis 48 in the region of the second longitudinal section 40.2 can be angled relative to the longitudinal axis 48 in the region of the first longitudinal section 40.1. The angling of the second longitudinal section 40.2 relative to the first longitudinal section 40.1 occurs through elastic deformation of the arm 40 in the region of the carriage 50.

[0069] It is conceivable that the arm 40, in particular the first side 43 and / or the second side 44, is provided with a coating. Paint and / or foil coatings are particularly conceivable here. It can be particularly advantageous if a friction-reducing coating is provided on the arm 40 to facilitate smooth adjustment of the carriage 50. For example, the arm 40 can be coated with a lubricating varnish.

[0070] The second longitudinal section 40.2 can be directed from the carriage 50 to the light head 10 and extend from the region of the bend through the carriage 50 to the second end region 42. The first longitudinal section 40.1 can extend from the light base 20 to the carriage 50. Accordingly, the first longitudinal section 40.1 can extend from the first end region 41 to the carriage 50.

[0071] As can be seen in Figure 1, the longitudinal sections 40.1, 40.2 themselves can each run straight, ie the longitudinal axis 48 can run straight in the region of the first longitudinal section 40.1 and the second longitudinal section 40.2, apart from a slight elastic deflection due to the weight of the arm 40 and / or the carriage 50 and / or the lamp head 10.

[0072] However, the second longitudinal section 40.2 can be angled relative to the first longitudinal section 40.1 such that the longitudinal sections 40.1, 40.2 enclose an angle 47. As can be seen from the figures, the first side 43 of the arm 40 can face the interior of the angle 47. Accordingly, the second side 44 can face away from the interior.

[0073] Due to the angling, as in the embodiment shown in Figure 1, the light head 10 can be held by the arm 40 in such a way that the illumination direction is directed at least partially downward and away from the first side 43 in the region of the second longitudinal section 40.2. Thus, for example, a surface of a table or a floor can be illuminated.

[0074] The adjustability of the carriage 50 along the longitudinal axis 48 enables the adjustability of the light 1. Thus, if the carriage 50 is adjusted downwards along the longitudinal axis 48, for example if it is moved towards the light base 20, the height of the light head 10 can be reduced. At the same time, this adjustment can lengthen the second longitudinal section 40.2 at the expense of the first longitudinal section 40.1. In other words, the area of ​​the bend, i.e. the connection point between the first and second arm sections 40.1, 40.2, is shifted downwards. Such a situation with a downwardly adjusted carriage 50 is shown in dashed lines in Figure 1. As can also be seen in Figure 1, the angle 47 can remain unchanged when the carriage 50 is adjusted.

[0075] Embodiments of the slide 50 will be discussed in more detail later. However, it is also evident from Figure 1 and the previous discussion that the adjustable slide 50 allows for particularly convenient adjustment of the lamp 1, in particular the position of the lamp head 10 relative to the lamp base 20. In particular, the adjustment can be performed with just one movement and advantageously with one hand. The slide 50 merely needs to be moved along the longitudinal axis 48 of the arm 40.

[0076] Figures 2 and 3 show possible embodiments of the light head 10 in more detail. The light head 10 can have a light source 11. The light source 11 can be designed as an LED arrangement with multiple LEDs 11.1. According to the exemplary embodiments in Figures 2 and 3, the light source 11 can be designed as an LED strip, which, for example, has multiple LEDs 11.1, which can be arranged in a row along the longitudinal axis 48.

[0077] The illuminant 11 can be attached to the arm 40 in the region of the second end region 42. Particularly if the illuminant 11 is designed as an LED strip, it can be glued, for example, to one side of the arm 40, in this case to the first side 43.

[0078] As can be seen from Figure 2, the luminaire 1 can further comprise a diffuser 12, which can serve to scatter the light generated by the illuminant 11. For example, the diffuser 12 can be made of a milky glass or plastic. The diffuser 12 can advantageously be designed such that it is detachably held on the arm 40. For example, it can be pushed onto the arm 40, as shown here. Figure 2 shows a situation in which the diffuser 12 has not yet been completely moved from the second end region 42 along the longitudinal axis 48 into its final position, so that two LEDs 11.1 still remain that are not covered by the diffuser 12. A voltage supply and / or control of the illuminant 11 can be realized by means of a conducting element 13. The conductive element 13 can have one or more conductor tracks 15.1, 15.2, for example one conductor track 15.1, 15 each.2 for connection to a positive and a negative pole and / or optionally further conductor tracks 15.1, 15.2, which can serve as a control line 19 for controlling the lamp 11, for example for color and / or brightness control. By means of the conductor element 13, a connection can be established between the lamp 11 and a connection point of the lamp base 20, for example in order to achieve a connection to a power supply and / or a control unit. Accordingly, the conductor element 13 can extend from the lamp 11 to the first end region 41, in which the arm 40 can be connected to the lamp base 20. In the first end region 41, for example, poles 17.1, 17.2 of the conductor element 13 can be provided, which can contact corresponding poles on the lamp base 20.

[0079] As shown in Figure 2, the conductive element 13 can be designed as a strip 14. It can be, for example, a foil strip onto which conductor tracks can be applied, in particular printed. The strip 14 can, for example, be applied, in particular glued, to one side, in this case the first side 43.

[0080] Alternatively, as shown in Figure 3, the conductive element 13 can consist of individual conductor tracks 15.1, 15.2 applied to the arm 40, in this case the first side 43. For example, the conductor tracks 15.1, 15.2 can be printed onto the arm 40. In this context, it is conceivable to cover the printed conductor tracks 15.1, 15.2 with a film or a varnish.

[0081] Figure 5 shows an embodiment of the arm 40, according to which two support elements 45 are provided, which follow one another in a direction transverse to the longitudinal axis 48 and transverse to the transverse extension. Figure 5a shows a perspective view, and Figure 5b shows an enlarged schematic partial section at the point marked Vb in Figure 5a.

[0082] The first side 43 of the arm 40 can be formed by one side of the one support element 45, in particular a convexly curved side, and the second side 44 can be formed by one side of the other support element 45, in particular a concavely curved side.

[0083] The support elements 45 can be electrically conductive and serve as electrical supply lines to the light head 10. Accordingly, an electrical connection between the light head 10 and a power supply can be established by means of the support elements 45. In this case, the support elements 45 can preferably have an electrically insulating layer 45.1, in particular an electrically insulating coating. Thus, according to this embodiment, a separate line element 13, which is applied, for example, to the arm 40, can be dispensed with.

[0084] A control line 19 for controlling the illuminant 11 can be routed between the support elements 45. According to Figure 5b, the control line 19 can be designed as a cable, in particular as a flat cable. However, it is also conceivable for the control line 19 to be applied to one of the support elements 45. For example, the control line 19 can be printed onto one of the support elements 45, in particular onto the insulating layer 45.1.

[0085] Figure 4 shows a possible embodiment of the lamp base 20 in more detail. The lamp base 20 can therefore have a bottom side 22, which can be placed, for example, on a table or a floor. Furthermore, the lamp base 20 can have an upper side 21 opposite the bottom side 22. The upper and lower sides 21, 22 can be connected to one another by means of a circumferential side 23. Thus, by means of the upper and lower sides 21, 22 and the circumferential side 23, a receiving space can be formed inside the lamp base 20, within which, for example, a power supply unit and / or a control unit for the lamp 11 can be accommodated. One possibility for connecting the arm 40 to the lamp base 20 can also be seen in Figure 4. The lamp base 20 can thus have a receiving area 24, on which part of the arm 40 can be held in the area of ​​the first end area 41.The receiving area 24 can, for example, be designed as a recess. As in the present example, the receiving area 24 can be designed as a concave recess with a fifth radius 25. The fifth radius 25 can be matched to the first radius 49.1 of the first side 43 of the arm 40. In this case, the arm 40 can be placed at least partially against the receiving area 24 in the region of the first end area 41.

[0086] As already evident in Figures 2 and 3, an opening 46 can be provided in the region of the first end portion 41 of the arm 40. As in the present case, the opening 46 can be a bore that penetrates the first and second sides 43, 44 of the arm 40. A corresponding bore can be provided on the lamp base 20, wherein the corresponding bore can preferably have an internal thread and is aligned with the opening 46 when the first end portion 41 abuts the receiving portion 24.

[0087] The first end region 41 can be held on the receiving region 24 by means of a holding element 30. The holding element 30 can have a connecting side 33, which is preferably convexly curved, and whose curvature has a third radius 39.1, which can be adapted to the second radius 49.2 of the curvature of the second side 44 of the arm 40. Accordingly, the connecting side 33 in the first end region 41 can at least partially bear against the second side 44 of the arm 40. The holding element 30 can further have a bore 37, which is aligned with the opening 46 in the arm 40 and the corresponding bore in the lamp base 20 when the first end region 41 bears against the receiving region 24 and the holding element 30 bears against the first end region 41. Due to the aligned bores orA fastening element 38, preferably a screw, can be passed through the opening 46, whereby the arm 40 can be clamped between the holding element 30 and the lamp base 20. The holding element 30 preferably has a vertical extension that corresponds to a vertical extension between the top side 21 and the bottom side 22 of the lamp base 20. Accordingly, an upper side 31 of the holding element 30 can be flush with the top side 21 of the lamp base 20. Likewise, undersides 32, 22 of the holding element 30 and the lamp base 20 can be flush. A particularly harmonious appearance can result if, as shown here, an outer side 34 of the holding element 30 opposite the connecting side 33 has a curvature with a fourth radius 39.2 that corresponds to a radius of the curvature of the peripheral side 23 of the lamp base 20.

[0088] In the area of ​​its underside 32, the holding element 30 can have a recess 36. For example, a connecting cable (not shown) can be guided through the recess 36 to the lamp base 20.

[0089] Figures 6 to 13 illustrate exemplary embodiments of the carriage 50. As already mentioned, the bending of the second longitudinal section 40.2 of the arm 40 relative to the first longitudinal section 40.1 is achieved by elastic deformation of the arm 40 in the region of the carriage 50.

[0090] The elastic deformation of the arm 40 can be achieved by providing the carriage 50 with support regions 51, 52, 53, each of which exerts a force on at least one side 42, 43 of the arm 40. Accordingly, by spacing the points of force application and aligning the forces, a bending moment acting on the arm 40 can result, causing the deformation of the arm 40.

[0091] As shown in Figure 6, the carriage 50 can be designed, for example, as a frame-like structure. The carriage 50 can have two oppositely arranged frame parts 66, which can be connected to one another by means of a plurality of cross-connectors 72. The cross-connectors 72 can be elongated between the frame parts 66 and, in particular, have a cylindrical cross-section. The cross-connectors 72 can be spaced from one another transversely to their longitudinal axes. In the present case, the cross-connector 72 shown at the bottom in Figure 6a has the first support region 51. The upper cross-connector 72 can have the second support region 52. A cross-connector 72 arranged between the upper and lower cross-connectors 72 can have the third support region 53. The support regions 51, 52, 53 can each serve to guide the arm 40 and to support the same, i.e., to exert forces on the arm 40.

[0092] As can be seen particularly in Figure 6c, the arm 40 can be guided between the frame parts 66. The arm 40 can be guided between the cross connector 72, which has the first support region 51, and the cross connector 72, which has the third support region 53. Furthermore, the arm 40 can be guided between the cross connector 72, which has the third support region 53, and the cross connector 72, which has the second support region 52.

[0093] Forces can be exerted on the second side 44 of the arm 40 by the first and second support regions 51, 52, respectively. In this sense, the second side 44 of the arm 40 can abut the first and second support regions 51, 52, as can be clearly seen in Figure 6c. The third support region 53 can exert a force on the first side 43 of the arm 40. The first side 43 can thus abut the third support region 53.

[0094] The forces acting from the respective support areas 51, 52, 53 on the respective sides 43, 44 can each have at least one component that is directed parallel to a surface normal of the respective side 43, 44. Thus, the interaction of these forces can result in a bending moment on the arm 40, which can be oriented about an axis parallel to its transverse extension.

[0095] Depending on the design of the support areas 51, 52, 53 and the respective side 43, 44, the said forces can act as point, line, or area loads on the respective side 43, 44. Thus, the support areas 51, 52, 53 can each have support surfaces 51.1, 52.1, 53.1, which are in force exchange with one of the sides 43, 44 of the arm 40, at least over part of their surface. In any case, however, a replacement force can be defined for the respective load, which can be applied as a resultant at a replacement point 51.2, 52.2, 52.3. Thus, a first replacement point 51.2 can be assigned to the first support area 51, a second replacement point 52.2 to the second support area 52, and a third replacement point 53.2 to the third support area 53.

[0096] The arrangement of the support regions 51, 52, 53 can preferably be selected such that an elastic deformation of the arm 40 is effected, which achieves a desired angle 47 of the second longitudinal section 40.2 of the arm 40 relative to the first longitudinal section 40.1.

[0097] For example, a straight first connecting line 81 from the first replacement point 51.2 to the third replacement point 53.2 can enclose an angle 54 with a straight second connecting line 82 from the third replacement point 53.2 to the second replacement point 52.2. Preferably, the angle 54 is selected to be greater than the angle 47 of the second longitudinal section 40.2 of the arm 40 relative to the first longitudinal section 40.1. The angle 54 can, in particular, be selected to be larger in order to take into account the thickness 49.3 of the arm 40 when the support regions 51, 52, 53 engage opposite sides 43, 44 of the arm 40.

[0098] As can be seen from Figure 6a, the cross-connectors 72 can, for example, be cylindrical. However, different cross-sectional shapes are also conceivable. In particular, it is conceivable for the cross-connectors 72 to have varying cross-sections along their longitudinal orientation (corresponding to the direction of the transverse extension of the arm 40). For example, particularly in the case of a curved first and / or second side 43, the cross-connectors 72 could be shaped accordingly, so that enlarged contact surfaces can result on the support surfaces 51.1, 52.1, 52.3. Accordingly, the cross-connectors 72 that are in contact with a convex side 43, 44 can, for example, be designed with a negative crown, and / or cross-connectors 72 that are in contact with a concave side 43, 44 can be designed with a positive crown. As can be seen from Figure 6b, the cross connectors 72 can be designed as roller bodies 70.For example, the roller bodies 70 can be elongated and cylindrical and can be mounted for rotation about a rotation axis 73, which runs along their longitudinal orientation or parallel to the transverse extension of the arm 40. The rotatability can be achieved in particular by means of a bearing element 68, which can be, for example, a plain or roller bearing. The bearing element 68 can be mounted on a bearing pin 67 provided on the frame part 66. Furthermore, a receiving space 71 can be provided on the roller body 70, in which the bearing element 68 is at least partially received, in particular with its outer circumference.

[0099] Configuring the cross connectors 72 as roller bodies 70 can be advantageous for improving the smoothness of the adjustment of the luminaire 1. Particularly if the arm 40 has a high flexural rigidity, for example, a large thickness 49.3 and / or support elements 45 with a large material thickness, the friction between the carriage 50 and the arm 40 can otherwise cause undesirably stiff adjustment. On the other hand, a minimum degree of friction between the carriage 50 and the arm 40 may be desirable to prevent automatic adjustment and / or the carriage 50 from falling toward the luminaire base 20.

[0100] Figure 7 shows a further embodiment of a carriage 50. This carriage 50 also has two frame parts 66, which are connected to one another by means of cross connectors 72. Here, the cross connector 72, to which the third support region 53 is assigned, is designed as a roller body 70, which in turn is rotatably mounted about a rotation axis 73. The roller body 70 can be mounted in a manner similar to the roller bodies 70 in Figure 6b. The remaining cross connectors 72 are not designed as roller bodies 70, although this would be conceivable. Compared to the roller bodies 70 in Figure 6b, the roller body 70 in Figure 7 has a larger outer circumference. With a larger outer circumference, improved guidance of the arm 40 can be achieved. This can be advantageous particularly in the area of ​​the third support region 53, since this is where the greatest bending stress occurs. This can reduce the risk of the arm 40 buckling.

[0101] A comparison with the carriage 50 of Figure 6 further reveals that the arrangement of the longitudinal axes of the cross connectors 72 differs from that shown in Figure 7. This may be necessary, in particular, because the third support surface 53.1 is further away from the longitudinal axis of the cross connector 72 of the third support area 53 due to the enlarged outer circumference of the roller body 70. To accommodate this circumstance, the frame parts 66 can be angled, as shown in Figure 7.

[0102] Figure 8 shows a further embodiment of a carriage 50. This carriage 50 also has two frame parts 66, which are connected to one another by means of cross connectors 72. Here, too, the cross connector 72, to which the third support region 53 is assigned, is designed as a roller body 70, which in turn is rotatably mounted about a rotation axis 73. The roller body 70 can be mounted in a manner similar to the roller bodies 70 in Figure 6b. The remaining cross connectors 72, which are assigned to the first support region 51 and the second support region 52, also have roller bodies 70; however, these do not extend over the entire distance between the frame parts 66, but are arranged centrally along the longitudinal axis of the cross connectors 72 and are rotatably mounted thereon. The cross connectors 72, on which the roller bodies 70 are mounted, can be torsionally rigid.

[0103] The example shown in Figure 9 differs from the previously described example in Figure 8 in that the cross connectors 72, which are assigned to the first support region 51 and the second support region 52, do not have roller bodies 70. Instead, projections 76 are provided on the cross connectors 72, which each form the first support region 51 and the second support region 52. The projections 76 can protrude beyond the outer circumference of the cross connectors 72 and can be designed, for example, as flat-shaped noses. The carriage 50 according to Figure 10 again has projections 76, which form the first support region 51 and the second support region 52. Furthermore, a roller body 70 is provided, which forms the third support region 53. However, this exemplary embodiment does not have frame parts 66. Instead, a curved plate part 74 is provided, from the inside of which (towards the interior of the angle 47) the projections 76 protrude.The third support area 53 is formed by the roller body 70, which in turn is rotatably mounted on arms 75, which also protrude from the inside of the plate part 74.

[0104] Figures 11 to 13 show carriages 50, each having a housing 60. The housings 60 can each have a first opening 57, which can point toward the lamp base 20, and a second opening 58, which can point toward the lamp head 10. A passage 61 can be provided inside the housing 60, which connects the two openings 57, 58 and through which the arm 40 can be guided. The passage 61 can follow a curved course, as can be seen particularly in Figure 12a. The support areas

[0105] 51, 52, 53 can be formed by the passage 61, in particular the support surfaces 51.1, 52.1, 53.1 can be formed by walls of the passage 61.

[0106] The housing 60 can, for example, as shown in Figure 11, be designed as a bent tube section, preferably with a rectangular cross-section. This can result in a lightweight and material-saving slide 50. However, it is also possible, as shown in Figure 12, for the housing 60 to have a different shape. In particular, the housing can be cylindrical or polyhedral. As can be seen in Figure 12a, the housing 60 can be solid except for the passage 61. However, it is of course conceivable for the housing 60 to be hollow.

[0107] Similar to what has already been described for the cross connectors 72, carriages 50, which have a passage 61 forming the support areas 51, 52, 53, can also have support areas 51, 52, 53 adapted to the shape of the sides 43, 44 of the arm 40.

[0108] 52, 53. In particular, the passage 61 and / or the openings 57, 58 may have a curved cross-sectional shape that corresponds to the curvatures of the sides

[0109] 43, 44, as can be seen in Figure 12c.

[0110] Finally, Figure 13 shows a carriage 50 similar to that in Figure 11, but the housing 60 does not completely enclose the passage 61. Rather, in the region of a first end 55 directed toward the lamp base 20 and a second end 56 directed toward the lamp head 10, housing regions 62 are provided, which have an outer wall 63 and two side walls 65.2 and are connected to an inner wall 64. The housing regions 62 only partially enclose the arm 40, while in the region of the third support region 53, only the inner wall 64 is provided, which in this region forms a connecting region between the housing regions 62. In the connecting region, the passage 61 is open on three sides. In this partially open region, the closed side of the passage 61, formed in this case by the inner wall 64, forms the third support region 53.The arm 40 is thus exposed in the connecting area between the housing areas 62 with its second side 44.

Claims

Claims 1. A lamp (1), in particular a floor-standing or table lamp, comprising a lamp base (20), a lamp head (10), and an arm (40) connecting the lamp base (20) and the lamp head (10), wherein the arm (40) has a flat first side (43) and an opposite flat second side (44), wherein the first side (43) and the second side (44) each have a longitudinal extension in the direction of a longitudinal axis (48) of the arm (40) and a transverse extension in a direction perpendicular to the longitudinal axis (48), and wherein the longitudinal extension is greater than the transverse extension, characterized in that a slide (50) adjustable along a longitudinal axis (48) of the arm (40) is provided, and in that by means of the slide (50) a second longitudinal section (40.2) of the arm (40) can be angled relative to a first longitudinal section (40.1) of the arm (40) by an elastic deformation of the arm (40) in the region of the carriage (50).

2. Lamp (1) according to claim 1, characterized in that the arm (40) has at least one band-shaped support element (45), in particular is formed by the at least one band-shaped support element (45), that the support element (45) extends along the longitudinal axis (48) from a first end region (41) to a second end region (42) of the arm (40), that the lamp base (20) is coupled to the arm (40) in the first end region (41), and that the lamp head (10) is coupled to the arm (40) in the second end region (42), wherein the carrier element 45 is preferably designed in one piece.

3. Lamp (1) according to claim 2, characterized in that the arm (40) has two support elements (45) which follow one another in a direction transverse to the longitudinal axis (48) and transverse to the transverse extent, that the two support elements (45) are designed to be electrically conductive, that by means of the support elements (45) an electrical connection between a power supply and the lamp head (10) can be established, wherein preferably the support elements (45) each have an electrically insulating layer (45.1).

4. Lamp (1) according to claim 3, characterized in that a control line (19) for controlling a lighting means (11) of the lamp head (10) is guided between the support elements (45), wherein the control line (19) is applied, in particular printed, to one of the support elements (45), preferably to the insulating layer (45.1), or wherein the control line (19) is designed as a cable, in particular as a flat cable.

5. Lamp (1) according to one of claims 1 to 4, characterized in that, viewed in a cross-section perpendicular to the longitudinal axis (48), one of the two sides (43, 44) of the arm (40) has a convex curvature and the opposite of the two sides (43, 44) has a concave curvature, wherein the concave and / or the convex curvature are preferably part-circular, further preferably resulting in a curved, in particular U-shaped cross-section of the arm (40).

6. Lamp (1) according to one of claims 1 to 5, characterized in that that the carriage (50) has a first support area (51), a second support area (52) and a third support region (53), each of which exerts a force on at least one side (42, 43) of the arm (40).

7. Lamp (1) according to claim 6, characterized in that the support areas (51, 52, 53) are spaced apart from one another along the longitudinal axis (48), that the first support area (51) and the second support area (52) each exert a force at least on the second side (44) of the arm (40), and that the third support area (53) exerts a force at least on the first side (43), wherein the third support area (53) is preferably provided along the longitudinal axis (48) between the first and the second support area (51, 52).

8. Luminaire (1) according to claim 7, characterized in that a straight first connecting line (81), which connects a first equivalent point (51.2) of the first support region (51) with a third equivalent point (53.2) of the third support region (53), and a straight second connecting line (82), which connects the third equivalent point (53.2) with a second equivalent point (52.2) of the second support region (52), encloses an angle (54) which is greater than or equal to an angle (47) which the first longitudinal section (40.1) encloses with the second longitudinal section (40.2), wherein an equivalent point of a support region (51, 52, 53) is in each case a point at which a respective resulting force of the support region (51, 52, 53) is effective on the first or second side (43, 44).

9. Lamp (1) according to one of claims 6 to 8, characterized in that the carriage (50) has a housing (60), that the housing (60) has two openings (57, 58) which are connected by means of a passage (61), that the arm (40) is received in the passage (61) between the openings (57, 58), that preferably at least the first support region (51) and the second support region (52) are formed within the passage (61), in particular the first support surface (51.1) and the second support surface (52.1) are formed by the passage (61), and that further preferably the third support region (53) is formed on the passage (61), in particular the third support surface (53.1) is formed on the passage (61).

10. Luminaire (1) according to one of claims 6 to 9, characterized in that the carriage (50) has two frame parts (66) which are spaced apart from one another in the direction of the transverse extent, that the frame parts (66) are connected to one another by means of at least one transverse connector (72) which is oriented in the direction of the transverse extent, and that the at least one transverse connector (72) has one of the support areas (51, 52, 53), wherein preferably at least two, in particular three, transverse connectors (72) are provided, each of which has one of the support areas (51, 52, 53).

11. Luminaire (1) according to claim 10, characterized in that the support area(s) (51, 52, 53) is / are formed by (a) peripheral surface(s) of the cross-connector(s) (72), 12. Lamp (1) according to claim 10 or 11, characterized in that at least one of the cross connectors (72) has a roller body (70) which is rotatably mounted about a rotation axis (73), wherein the axis of rotation (73) is aligned parallel to the direction of the transverse extension, and wherein a circumferential surface of the roller body (70) forms the support region (51, 52, 53).

13. Luminaire (1) according to claim 12, characterized in that the roller body (70) is rotatably mounted by means of a bearing element (68), preferably by means of a sliding or rolling bearing, wherein a bearing pin (67) is preferably provided on the frame part (66), which is at least partially received in a bearing receptacle (69) of the bearing element (68), wherein further preferably a receiving space (71) is provided at least partially within the roller body (70), in which the bearing element (68) is at least partially received.

14. Luminaire (1) according to one of claims 10 to 13, characterized in that at least one of the cross-connectors (72) has a projection (76) which projects beyond the / a peripheral surface of the cross-connector (72), and in that the projection (76) has the support region (51, 52, 53) which is assigned to the at least one cross-connector (72).

15. Luminaire (1) according to one of claims 6 to 14, characterized in that the carriage (50) has a plate part (74), that the carriage (50), preferably projecting from the / a plate part (74), has at least one arm (75), that a cross connector (72') is held on the arm (75) which is aligned in the direction of the transverse extent, and that the cross connector (72') has one of the support areas (51, 52, 53), wherein preferably the cross connector (72') has a roller body (70) which is mounted on the boom (75) so as to be rotatable about an axis of rotation (73) oriented in the direction of the transverse extent and which forms the support region (51, 52, 53), and / or that at least one of the support regions (51, 52, 53) is formed by at least one projection (76) which is provided on the plate part (74), in particular that the cross connector (72') has the third support region (53), and that in each case one projection (76) is provided which in each case has the first and the second support region (51, 52).

16. Luminaire 1 according to one of claims 6 to 15, characterized in that the carriage (50) has an adjusting device, and in that the position of at least one support area (51, 52, 53) relative to at least one other support area (51, 52, 53) is adjustable by means of the adjusting device, wherein the position of the third support area (53) relative to the first and / or the second support area (51, 52) is preferably adjustable by means of the adjusting device.

17. Luminaire (1) according to one of claims 1 to 16, characterized in that at least one of the sides (43, 44) has a friction-reducing layer, in particular a friction-reducing coating, preferably a sliding varnish, and / or that the / an insulating layer (45.1) which is provided on a support element (45) of the arm (40) has friction-reducing properties, in particular has a sliding varnish, preferably is formed by a sliding varnish.

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