SYSTEM FOR A PRESENTATION, SALES OR EXHIBITION STAND AND / OR FOR SHOP FITTING, AS WELL AS POWER CONSUMER FOR AN ELECTRICAL DEVICE IN SUCH A SYSTEM AND ITS USE

Description

[0001] The present invention relates to a system or presentation system, in particular for a presentation, sales or trade fair stand and / or for shopfitting, as well as a current collector for an electrical consumer. The proposed presentation system can also be used in museums or in the smart home sector. A system with the features specified in the preamble of claim 1 is known from WO 2020 / 201395 A1.

[0002] A presentation or trade fair booth is the first point of contact for a new customer and therefore particularly important as a showcase for the presenting company. For this reason, increasing emphasis is being placed on the visual impression and the possibilities for diverse and, in particular, flexible presentations. As a special eye-catcher, special electrical devices such as lighting fixtures or monitors are increasingly being used on wall, floor, or ceiling elements of presentation, trade fair, or sales booths, as well as in shopfitting, to draw the viewer's attention to specific elements. However, the arrangement of such lighting fixtures or electrical devices in general currently requires cabling, which severely limits the flexibility regarding changes to the arrangement of the electrical devices or lighting fixtures.Similarly, increasing emphasis is being placed on an appealing appearance in shopfitting.

[0003] From DE 10 2011 005 735 A1, a system for a presentation, sales or trade fair stand and / or for shopfitting is known, comprising at least one wall, floor or ceiling element with a carrier material and a covering covering it, wherein electrical conductors are applied to the carrier material or arranged on / in the covering and wherein the carrier material and / or the electrical conductors are magnetizable, i.e., have ferromagnetic properties; and comprising at least one electrical consumer which can be fixed to the carrier material by means of at least one magnet, wherein the electrical consumer has needle-shaped current collectors which penetrate the covering when the electrical consumer is fixed to the carrier material and thereby establish an electrical contact with the conductors and supply the electrical consumer with current.

[0004] The system known from DE 10 2011 005 735 A1 makes it possible, for example, to create a wall element, for example for a presentation, sales or trade fair stand or for shopfitting, which in particular allows for an easily changeable and therefore flexible arrangement of electrical consumers on the wall element.

[0005] DE 10 2018 115 659 B4 discloses a system for a presentation, sales or trade fair stand and / or for shopfitting with a current-carrying wall element and a current collector for an electrical consumer, which is designed to be attached to the wall element; wherein the wall element has a carrier plate and a covering plate; wherein the wall element has first electrical conductors of a first polarity and second electrical conductors of a second polarity, wherein the first and second electrical conductors are arranged alternately at least sectionally; wherein the current collector has a plurality of at least three contact pins, wherein the current collector is designed to be attached to the wall element such that at least one of the contact pins contacts one of the first electrical conductors and at least one other of the contact pins contacts one of the second electrical conductors;and wherein a first contact needle, a second contact needle, and a third contact needle of the plurality of contact needles are arranged such that they lie on a circle. DE 10 2018 115 659 B4 further discloses a corresponding current collector.

[0006] The solution described in DE 10 2018 115 659 B4 is intended to enable a freely selectable and flexibly changeable positioning of an electrical consumer on a wall element in a simple manner.

[0007] Against this background, the purpose of this disclosure is to provide a further improved system for presentation, sales, or trade fair stands and / or for shopfitting. In particular, it would be desirable to further improve the reliability and / or lifespan of such systems.

[0008] According to a first aspect of the present disclosure, a system is therefore proposed, in particular for a presentation, sales or exhibition stand and / or for shopfitting, comprising a current-carrying wall element and a current collector for an electrical consumer, which is designed to be attached to the wall element; wherein the wall element comprises a carrier plate and a covering thereon; wherein the wall element comprises first electrical conductors (of a first polarity) and second electrical conductors (of a second polarity), wherein the first and second electrical conductors are arranged alternately at least sectionally; wherein the current collector comprises a plurality of at least two contact needles, in particular at least three contact needles, wherein the current collector is configured to be attached to the wall element such that at least one of the contact needles contacts one of the first electrical conductors and at least one other of the contact needles contacts one of the second electrical conductors; and wherein the current collector comprises replaceable contact needles.

[0009] According to a second aspect of the present disclosure, a corresponding current collector for an electrical consumer (for use) in a system for a presentation, sales or exhibition stand and / or for shopfitting is proposed.

[0010] According to another aspect of the present disclosure, the use of such a current collector in such a system is proposed for a presentation, sales or exhibition stand and / or for shopfitting.

[0011] According to another aspect, a corresponding procedure is proposed for or for equipping a presentation, sales or trade fair stand and / or for shopfitting.

[0012] In practice, it has been shown that a system for presentation, sales, or trade fair stands and / or for shopfitting, such as that described in DE 10 2018 115 659 B4, invites and encourages users to playfully experiment with different positions of electrical devices, for example, by frequently redecorating a shop window. Electrical devices are moved to different positions multiple times to achieve a desired effect and to showcase the items being presented in the best possible light. The inventors recognized that the contact pins should preferably be very thin to avoid leaving visible marks when penetrating fabrics or coverings of wall elements. Furthermore, the use of thin pins facilitates penetration of coverings made from a wide variety of materials.The inventors further recognized that this requirement conflicts with the goal of providing the most sustainable and durable product possible, as current collectors with thin contact pins have a limited lifespan. For maximum mechanical stability, the contact pins should be thicker and more robust. Therefore, it would be desirable to provide a further improved system for presentation, sales, or trade fair stands and / or for shopfitting, one that promotes the responsible use of limited resources. In particular, it would be desirable to further improve the reliability and / or lifespan of such systems.

[0013] According to the present disclosure, a system is therefore proposed, particularly for a presentation, sales or exhibition stand and / or for shopfitting, comprising a current-carrying wall element and a current collector for an electrical consumer, which is designed to be attached to the wall element, wherein the wall element has a carrier plate and a covering covering it, and wherein the current collector has replaceable contact pins. In the specific context of such a system for a presentation, sales or exhibition stand and / or for shopfitting, no such current collector with replaceable contact pins, designed to penetrate the covering of the carrier plate, has been described to date.

[0014] The proposed solution is based on the general concept that a current-carrying wall serves as the source, and an adapter or current collector is provided to draw current from the wall. The wall element can be configured to be connected to a current or voltage source, such as a power supply. The first conductor tracks can be connected, particularly via a first rear connection contact, to a positive terminal, and the second conductor tracks, particularly via a second rear connection contact, to a negative terminal. For example, a DC voltage of 12V or 24V can be supplied. Alternatively, another type of voltage supply, such as AC voltage or DC voltage with a superimposed AC voltage, can be provided via the first and second conductor tracks. The wall element can have a carrier plate and, optionally, a covering for it.The combination of a support plate and a cover is particularly advantageous for such presentation stands, as the cover can be quickly changed and the stand easily readjusted. The cover can extend over a wall element or a group of wall elements. For example, such a cover can be printed and / or labeled. The current collector and / or the electrical load can be designed to be attached to the wall element. Power can also be supplied via a current-carrying mounting rail arrangement, as described in DE 10 2020 104 017 A1. The disclosure of DE 10 2020 104 017 A1 is incorporated herein by reference. The current-carrying mounting rail arrangement can be designed to hold the wall element on the one hand and to supply it with power via the first and second electrical connection contacts on the back of the support plate on the other.

[0015] The conductive traces of the electrical wall element can be an integral part of the support element, for example, in the form of a stamped steel plate, and can be arranged on the support material and / or on / in the coating. It is understood that a wall element can also have a layered structure. Such a layered structure can comprise one or more of the following layers: a supporting structure such as wood or metal, a layer of a magnetic or magnetizable material such as steel, an insulating layer, and a conductive trace layer, for example, made of a (thin) metal foil. For example, a support plate or supporting structure, such as one made of plastic, can be provided, onto which a layer of a magnetic or magnetizable material, such as steel, is applied. This layer can optionally also serve as the first and / or second conductive trace, and a coating can optionally be provided.The use of a layer of magnetic or ferromagnetic material is advantageous because a current collector or consumer can be flexibly attached to the wall element using magnets.

[0016] The current collector has a plurality of at least two or at least three contact pins, for example, exactly three or exactly four. The current collector is designed to be attached to the wall element such that at least one of the contact pins contacts one of the first electrical conductors and at least one other contact pin contacts one of the second electrical conductors. For example, if the conductors are arranged on the backing plate of the wall element and the wall element has a covering over the backing plate, the contact pins can be designed to penetrate the covering and establish a connection with the respective conductors. The contact pins can pierce through or into the wall element. It is also conceivable that the electrical conductors are integrated into the covering, in particular woven into it.In principle, the current collector can be designed to establish an electrical connection with the first and second conductor tracks when placed on the wall element and to supply the tapped voltage to a consumer.

[0017] Advantages of the proposed solution compared to conventional shopfitting or exhibition stand construction include the elimination of complex wiring for individual electrical devices attached to the presentation element. Instead, the devices can be flexibly attached to the presentation element on the fly. This eliminates costly adjustments. Furthermore, it fosters creativity, as the individual devices can be flexibly repositioned and aligned, particularly with regard to their rotation relative to the wall element. Such a system encourages experimentation with the arrangement of the electrical devices to achieve the most appealing presentation result. In particular, the electrically conductive wall element can be energized before the devices are attached, allowing the result to be immediately assessed.Extensive rewiring is not necessary.

[0018] It is understood that the current collector can either be attached to the wall element as such and the tapped current can be supplied to a consumer, for example via cable, or it can be integrated into a bracket or an electrical consumer.

[0019] A system for a presentation, sales, or trade fair stand and / or for shopfitting can also be referred to as a display stand. A wall element within the scope of this disclosure can also refer to a floor element or a ceiling element. Within the scope of this disclosure, a contact needle can also be understood to mean a contact pin or contact prong, which does not necessarily have a tapered tip. The contact needles can be arranged such that they, or their tips or ends, lie in one plane. Optionally, the contact needles can be spring-loaded. The contact needles can be designed to penetrate the coating. Within the scope of this disclosure, an equilateral triangle can optionally be understood to mean a triangle in which the lengths of the legs or sides are equal.sides differ by no more than 20%, preferably by no more than 10%, preferably by no more than 5% in each case relative to one of the other legs or one of the other sides.

[0020] In one embodiment, the current collector can comprise a base body and a needle holder; wherein the needle holder contains the contact needles; and wherein the needle holder with the contact needles is replaceable. An advantage of this solution is that the contact needles do not need to be replaced individually, but instead the needle holder with the contact needles needs to be replaced. This can allow for simpler handling and faster replacement of damaged contact needles.

[0021] The current collector can have a locking mechanism for the detachable attachment of the needle holder to the base body. The locking mechanism can be part of the replaceable needle holder. In this case, even if the locking mechanism is damaged, the entire current collector is not necessarily unusable. For example, a detachable snap-in mechanism can be provided. The needle holder can have a rotating cross that engages in recesses on the base body for locking. The locking mechanism can, for example, have a rotary lock; in particular, the rotary lock has a slot-shaped recess for actuation. Such a rotary lock can be easily actuated, for example, with a coin.

[0022] The current collector can be designed so that the needle holder can be attached to the base body without tools. This can facilitate the replacement of the needle holder with the contact needles.

[0023] The current collector can have electrically conductive spring pins designed to provide an electrical connection between the contact needles of the needle holder, particularly the rear ends of the needle holder's contact needles, and electrical contacts of the base body. The spring pins can be part of the base body or part of the needle holder. An advantage of this design is that a reliable electrical connection to the base body's contacts can be established. The electrical load can be powered directly or indirectly via the base body's electrical contacts. For example, the current collector can have an intermediate rectifier to provide an output voltage of defined polarity.

[0024] The electrically conductive spring pins can also be designed to lift the needle holder relative to the base body for easier removal or replacement. An advantage of this solution lies in the synergistic effect that the electrically conductive spring pins establish electrical contact between the base body and the needle holder while simultaneously facilitating removal of the needle holder from the base body. When a locking mechanism for the detachable attachment of the needle holder to the base body is released, the needle holder can be lifted relative to the base body by means of the electrically conductive spring pins, thus facilitating its removal during replacement. A new needle holder can then be inserted. The new needle holder, with new contact needles, can be lowered against the spring tension of the spring pins and secured to the base body by means of a locking mechanism.Another synergistic effect can be that the locking mechanism can be more stable if the spring pins press the needle holder against the base body in a locked state and require an increased frictional force to release the locking mechanism.

[0025] In a further development, the base body can have a printed circuit board on which the electrically conductive spring pins are arranged. The electrically conductive spring pins can be glued or soldered to the printed circuit board of the base body. Soldered spring pins are particularly advantageous because both a mechanical and electrical connection can be provided, and the spring pins can be easily attached during the production of the printed circuit board of the current collector's base body. In the proposed embodiment, the electrically conductive spring pins represent only an intermediate element within the current collector to establish an electrical connection to the backs of the contact needles. The needle holder preferably does not have a printed circuit board in order to provide the most cost-effective and resource-efficient replacement element possible.

[0026] The contact pins can each have a recess at one end facing the respective electrically conductive spring pin, into which a head end of the electrically conductive spring pin projects. This allows a mechanically stable and preferably self-centering connection between the spring pin and the contact pin to be established.

[0027] In one embodiment, the system can further include a rectifier. The rectifier can be configured to provide an output voltage of defined polarity based on an input voltage applied to at least two of the contact pins. The rectifier can be part of the current collector, a separate component, or even part of the electrical load. In particular, the base of the current collector can incorporate the rectifier. The base of the current collector can include a circuit board with the rectifier. Preferably, the electrically conductive spring pins are arranged on the same circuit board as the rectifier. For example, a bridge rectifier can be provided. Alternatively or additionally, the rectifier can be arranged in a load that can be connected to the current collector. The rectifier can have a first output contact and a second output contact.To limit the circuit complexity and thus the cost of the rectifier, the current collector preferably has exactly four, exactly three, or exactly two contact needles. Particularly with exactly four contact needles, there is an advantage in the limited circuit complexity and the ability to cover large angular ranges.

[0028] In a further training, the rectifier can have at least three inputs and (exactly) two outputs, with each of the at least three inputs being connected to a respective contact needle.

[0029] According to the invention, the base body of the current collector has a receptacle for receiving the needle holder. The needle holder with the contact needles is designed to be detachably inserted into the receptacle of the base body. An advantage of this solution can be a simplified assembly procedure. Preferably, access for replacement is only required from an underside of the current collector on which the tips of the contact needles are located.

[0030] The current collector's needle holder can be rotationally symmetrical, and the current collector's base body can have a rotationally symmetrical receptacle for the needle holder. An advantage of this solution can be further simplified handling. The needle holder and / or the current collector's receptacle can, for example, be 180° rotationally symmetrical and / or 90° rotationally symmetrical. Rotationally symmetrical here means that the needle holder can be inserted into the receptacle in different rotational states.

[0031] The contact pins of the current collector's needle holder can be arranged around a centrally positioned actuating element of a locking mechanism for the detachable attachment of the needle holder to the base body. An advantage of this solution can be a particularly compact design. Alternatively or additionally, a rotationally symmetrical design can be easily achieved.

[0032] The current collector according to the invention has more than two contact needles, for example, at least three contact needles. In particular, the current collector can have between three and seven contact needles, in particular between three and five contact needles, and in particular exactly four contact needles. This allows for a high probability that at least one of the contact needles contacts one of the first electrical conductors and at least one other contact needle contacts one of the second electrical conductors. The inventors have recognized that four contact needles offer an advantageous solution between limited material usage and a high probability of successful contact.

[0033] The pantograph can be configured to transmit electrical power between 1 W and 250 W, in particular between 2 W and 200 W, in particular between 5 W and 150 W, and in particular between 5 W and 100 W. A lower limit of the power range can be 1 W, 2 W, 5 W, 10 W, or 20 W. An upper limit of the power range can be 250 W, 200 W, 150 W, 100 W, or 60 W. For example, the pantograph can provide 60 W of power to an electrical load at a voltage of 24 V and a current of 2.5 A. However, it is also conceivable to use, for example, integrated semiconductor rectifiers that allow a current load of 4.5 A or even 6.3 A.

[0034] The wall element and the electrical device can be configured such that the electrical device can be magnetically attached to the wall element. The electrical device can have a receptacle for the current collector. In particular, the electrical device can have a recess or depression for receiving the current collector. The electrical device can have multiple magnets arranged around the recess for magnetically attaching the electrical device to the wall element. This solution can enable a stable attachment of the electrical device. Furthermore, the arrangement of the magnets around the recess for the electrical device can provide a uniform, and especially not one-sided, contact pressure of the current collector against the current-carrying wall element.

[0035] In one embodiment, the contact pins of the current collector can be arranged such that, when the current collector rests on the current-carrying wall element, at least one first contact pin (lying on the circle) can be brought into contact with one of the first conductor tracks, and a second contact pin (lying on the circle) can be brought into contact with one of the second conductor tracks, regardless of any rotation (or orientation) of the current collector (in the plane of the circle or the plane of the wall element). It is understood that the contacting is not completely independent of rotation, but rather, within the scope of this disclosure, is to be understood as largely independent of rotation, for example, taking into account a tolerance of ±5° or ±10°, so that a contact pin does not fall into a gap between two adjacent conductor tracks.Such a gap may be provided to prevent a short circuit between two adjacent conductor tracks.

[0036] In other words, the contact pins of the current collector can preferably be arranged such that, regardless of any rotation of the current collector on the wall, at least one of the contact pins makes a connection with one of the first conductor tracks (e.g., the positive terminal) and at least one other of the contact pins makes a connection with one of the second conductor tracks (e.g., the negative terminal). Thus, an electrical power supply to a load via the proposed current collector can be enabled over a wide angular range.

[0037] In one embodiment, at least one (preferably all) of the contact needles can be configured such that one tip of the contact needle has an angle between 60° and 20°, in particular between 45° and 25°, and in particular between 30°. For an angle of 30°, a tolerance of ±10°, and in particular ±5°, is permissible. An advantage of this embodiment can be good penetration of the optional covering coating and simultaneously sufficient contact area and conductivity.

[0038] The current collector can have a plurality of at least three contact needles, wherein a first contact needle, a second contact needle, and a third contact needle of the plurality of contact needles are arranged such that they lie on a circle. The features according to this further aspect can preferably be combined with the features described above concerning the current collector with replaceable contact needles.

[0039] The solution known from DE 10 2011 005 735 A1 allows for largely free positioning in both horizontal and vertical directions on a current-carrying wall element. However, with conventional needle connectors, the problem arises that rotating the current collector relative to the current-carrying wall element can result in both contact needles lying on the same electrical conductor. For example, a current collector or an electrical device with a current collector cannot simply be rotated by 90°. It would be desirable to further improve the positioning capability and to establish electrical contact even at different angular orientations.

[0040] The inventors recognized that the solution proposed in DE 10 2011 075 460 A1 for the wireless transmission of electrical energy offers a solution to this problem and enables largely flexible positioning of electrical devices on a wall element. Rotation of the device or current collector relative to the wall element is also possible. However, the effort and costs for a widespread wireless power supply are relatively high. Furthermore, wireless power supplies have a relatively low efficiency.

[0041] Optionally, the current collector can have not only two contact needles, but a plurality of at least three contact needles, wherein a first contact needle, a second contact needle, and a third contact needle of the plurality of contact needles are arranged such that they lie on a circle or arc. The proposed arrangement of the contact needles on a circular arc allows for an additional degree of freedom, in addition to relatively free positioning, e.g., in the horizontal and / or vertical direction, which can enable freer rotation.

[0042] This increases the probability that at least one of the contact pins will contact one of the first electrical conductors and at least one other contact pin will contact one of the second electrical conductors. In other words, the contact of at least two contact pins with the respective conductors of opposite polarity can be maintained for a longer period during rotation. Further measures to enable the freest possible rotation are explained below using examples.

[0043] Alternatively or in addition to the above-mentioned arrangement of the first, second and third contact needles, the first, second and third contact needles can be arranged such that a first straight line through the first and second contact needles and a second straight line through the second and third contact needles intersect at an (acute) angle.

[0044] The first, second, and third contact pins of the pantograph can be arranged to form a triangle, in particular an acute triangle. An acute triangle is a triangle in which all angles are less than 90°. The three sides may, but do not have to, be of different lengths.

[0045] In a further development, the first, second and third contact needles of the current collector can be arranged in such a way that they form an isosceles, in particular an equilateral, triangle.

[0046] A triangular arrangement of the first, second and third contact needles lying on the circle or arc of the circle, in particular for an arrangement as an approximately equilateral triangle, can enable a more flexible arrangement, especially with regard to a rotation of the current collector on the wall element.

[0047] In one embodiment, the diameter of the circle on which the first, second, and third contact needles lie can be less than or equal to the sum of the width of one of the first conductor tracks and the width of an (adjacent) second conductor track, as well as optionally an intermediate gap. An advantage of this solution can be that, when the current collector rotates, different contact needles come to rest on the first or second conductor track, and contact between at least two contact needles on different conductor tracks is enabled over a larger angular range.

[0048] In one embodiment, the contact needles lying on a circle can be arranged such that the first contact needle lies in the first third of the circle, the second contact needle lies in the second third of the circle, and the third contact needle lies in the third third of the circle. For example, the circle can be divided into three equal sectors, and one of the three contact needles can lie in each of the three sectors.

[0049] In one embodiment, the current collector can further comprise a fourth, a fifth, and a sixth contact needle. The first through sixth contact needles can be arranged in a hexagonal configuration. In particular, the contact needles can be arranged in a hexagonal configuration, especially as an equilateral hexagon or a star, with each contact needle forming the vertices of the hexagon or the apex of the star, respectively. It is understood that a different number of contact electrodes can also be provided, in particular four or more, five or more, six or more, seven or more, or eight or more.

[0050] In one embodiment, the current collector can be designed and the contact pins arranged such that, when the current collector is attached to the wall element, at least two contact pins contact one or more of the first electrical conductors, and at least two contact pins contact one or more of the second electrical conductors. This can be particularly advantageous for applications with high current requirements. A current collector with three or four contact pins is generally sufficient even for currents up to 2 A. However, a higher number of contact pins can be advantageous because the current per current collector can be reduced. For example, this allows the use of less expensive components. For instance, two standard diodes rated at 2 A each may be less expensive than one high-power diode rated at 4 A.Alternatively, multiple current collectors can be used in parallel to draw the required power. Experiments have shown that, in addition to powering lights, it is also possible to power screens. With interconnections such as a parallel connection of several current collectors, power outputs of up to 3,000 watts or more are generally achievable.

[0051] In one embodiment, the contact pins can be arranged such that the distance between the first contact pin and a straight line through the second and third contact pins is greater than the width of one of the electrical conductors. Alternatively or additionally, the distance between the first contact pin and a straight line through the second and third contact pins can be less than twice the width of one of the electrical conductors, plus an optional intermediate insulation gap. An advantage of this arrangement is that it allows rotation over a wide angular range.

[0052] In one embodiment, the current collector can have a fourth contact pin, and this fourth contact pin can be located within the circle on which the first, second, and third contact pins are arranged. For example, the fourth contact pin can be located at the center of the circle or at the center point of a triangle formed by the first, second, and third contact pins. An advantage of this embodiment is that it further improves the probability of establishing a sufficient electrical connection between the current collector and the conductor tracks. For example, it can address the problem of two of the three contact pins lying on the circle falling into an insulation gap between one of the first conductor tracks and one of the second conductor tracks. In a further development, the fourth contact pin can be positioned at a distance from the center point of the circle.It is understood that the features of this embodiment can also be combined with the features of one or more of the preceding or subsequently described embodiments. A "fourth" contact needle can be understood to mean a further contact needle. For example, a fourth contact needle within the aforementioned hexagonal arrangement can be understood as a first fourth contact needle, and a fourth contact needle which, according to the present embodiment, lies within the circle, can be understood as a second fourth contact needle or further contact needle. It is understood that this second fourth contact needle or further contact needle can lie within a circle on which the first, second, and third contact needles are arranged, but further contact needles can also be arranged.

[0053] In one embodiment, the current collector (optionally in conjunction with a holder) can be configured so that the contact pins are movable between a contact position, in which the contact pins make contact with the conductor tracks, and a non-contact position, in which the contact pins are spaced away from the conductor tracks, when the current collector is placed on the current-carrying wall element. The non-contact position can also be referred to as a sliding position. Preferably, the current collector can therefore be moved on the wall element to reach a desired position. Once the desired position is reached, the contact pins can be lowered or moved into the contact position.In one example, the current collector can have a holder, the holder being designed such that the contact pins are brought into contact with the conductor tracks by inserting, for example, a consumer into the holder. For instance, the contact pins are only activated when a connection element is inserted or a consumer or housing is plugged in or attached. An advantage can be improved positioning in the non-contact position.

[0054] In one embodiment, the current collector can be designed such that a straight line through the first and second contact needles intersects a horizontal or vertical axis of the current collector at an acute angle when the current collector is in a horizontal or vertical orientation (on the wall element), in particular at an angle of no more than 30°, in particular at an angle of no more than 15°, in particular at an angle of no more than 5%.

[0055] Alternatively or additionally, in one embodiment the system may also have an electrical consumer on which the current collector is arranged such that a straight line through the first and second contact needles intersects a horizontal or vertical axis of the electrical consumer at an acute angle when the electrical consumer is in a horizontal or vertical orientation (on the wall element), in particular at an angle of no more than 20°, in particular at an angle of no more than 10°, in particular at an angle of no more than 5%.

[0056] In other words, the arrangement of the contact pins can be rotated at an (acute) angle relative to the orientation of the conductor tracks. The relative position of the contact pins and the housing is crucial. One advantage of this solution can be improved contact reliability. The inventors recognized that, particularly in shopfitting, elements attached to wall panels are preferably mounted horizontally or vertically. Furthermore, angles in the range of 25° to 65° are frequently used. Small rotations, for example, of 5° or 10° with respect to the horizontal or vertical, are more likely to be perceived as an undesirable tilt or misalignment. By selecting precisely such a rarely occurring angle, the probability of two contact pins lying in a line falling into an insulation gap between two adjacent conductor tracks can be reduced.

[0057] In one embodiment, the wall element and the current collector can be configured such that the current collector can be magnetically attached to the wall element. Alternatively, other fasteners or fastening methods, such as adhesives or screws, can be used. However, the use of a detachable connection is preferred to allow for future modifications.

[0058] The advantages described above in detail for the first aspect of the invention can apply accordingly to the other aspects of the invention.

[0059] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or individually, without leaving the scope of the present invention as defined by the claims.

[0060] Embodiments of the invention are illustrated in the drawing and explained in more detail in the following description. The drawing shows: Fig. 1 shows an exemplary presentation stand with a system according to an embodiment of the present disclosure with several wall elements; Fig. 2 shows a schematic representation of a wall element without a coating; Fig. 3 shows a schematic representation of a wall element with a coating; Fig. 4 shows a side view of a current collector attached to a wall element according to the prior art; Fig. 5 shows an enlarged view of the current collector made of Fig. 4 Fig. 6 is a first exemplary representation of an arrangement of contact needles on a current collector; Fig. 7 is a second exemplary representation of an arrangement of contact needles on a current collector; Fig. 8 is a third exemplary representation of an arrangement of contact needles on a current collector; Fig. 9 is a fourth exemplary representation of an arrangement of contact needles on a current collector; Fig. 10 shows arrangements of contact needles on a current-carrying wall element in various positions and rotations; Fig. 11 shows a further representation of various arrangements of contact needles on a current-carrying wall element in various positions and rotations; Fig. 12 shows an arrangement of three contact needles in conjunction with a rectifier; Fig. 13 shows an arrangement of four contact needles in conjunction with a rectifier; Fig.Figure 14 shows a perspective view of a current collector according to an embodiment of the present disclosure; Figure 15 shows a perspective view of a current collector according to a further embodiment of the present disclosure; Figure 16 shows a perspective view of a current collector according to a further embodiment of the present disclosure; Figures 17A to F show a top view, as well as side views and sectional views of a current collector according to an embodiment of the present disclosure; Figures 18A and B show views of the contact pin and spring pin; Figures 19A to D show a top view, as well as side views and sectional views of a base body of a current collector according to an embodiment of the present disclosure; Figure 20 shows a perspective view of the base body of the current collector. Fig. 19A up to D; Fig. 21 shows a top view of a corresponding printed circuit board; Fig. 22 shows a flowchart of a process

[0061] In Fig. 1 An exemplary presentation stand 100, or shop window display, with a system according to an embodiment of the present disclosure is shown. The presentation stand 100 has a plurality of wall elements 10. Various objects 5 can be attached to the wall elements 10. Various fastening devices known from shopfitting or trade fair construction can be used for this purpose. In a preferred embodiment, the objects can be magnetically attached to the wall elements 10. An advantage of this solution is that the objects 5 can be freely positioned on the wall elements 10. It is also understood that corresponding floor or ceiling elements can be provided, which, for the sake of simplicity, are also referred to as wall elements within the scope of the present disclosure.The objects can be electrical consumers 5, such as a light source, a lighting device, a screen, a motor, a loudspeaker, a mannequin, or the like. Current collectors are provided for power supply; these are electrically connected to the electrical consumers 5 or can be designed as part of the objects or electrical consumers.

[0062] The proposed wall element 10 and the associated current collector 20 allow for the easy modification of presentation, sales, or exhibition stands 100, particularly in modern showrooms, and their adaptation to local conditions, thus achieving a high degree of flexibility in terms of design freedom for the presentation, sales, or exhibition stand 100. Such wall elements 10 can also be used in shopfitting. Furthermore, the system can also be used advantageously in museums or in the smart home sector.

[0063] In particular, this design eliminates the need for complex wiring of electrical devices compared to previous exhibition stands, significantly simplifying assembly and disassembly. Furthermore, the electrical devices can be positioned almost freely and flexibly. The presentation, sales, or exhibition stand is typically constructed by assembling several wall elements.

[0064] A special feature of the proposed system is that the current collectors 10 and the electrical loads 5 can preferably not only be flexibly positioned on the wall elements 1 with respect to their horizontal and vertical position, but can also be rotated. For this purpose, the proposed system comprises at least one current-carrying wall element 10 and one current collector 20 for an electrical load 5. An embodiment of a current-carrying wall element 10 is shown in Fig. 2 and 3 Examples of current collectors are shown in Fig. 4 shown ff.

[0065] Fig. 2 Figure 1 shows a schematic representation of a first embodiment of a wall element 10 without a coating. The wall element 10 has first electrical conductors 11 of a first polarity and second electrical conductors 12 of a second polarity. The first and second electrical conductors 11, 12 are arranged alternately, at least in sections. The first electrical conductors 11 can form a first comb-like structure. The second electrical conductors 12 can form a second, corresponding comb-like structure, wherein the first and second comb-like structures are designed such that the comb-like structures interlock. An insulation gap is provided between the first and second electrical conductors 11, 12. The insulation gap ensures that no short circuit occurs.Preferably, the width of the insulation gap is as small as possible, for example, less than 2 mm, in particular less than 1.5 mm, in particular less than 1.0 mm, in particular less than 0.5 mm, in particular less than 0.2 mm. The width of the insulation gap can be less than 1 / 10, in particular less than 1 / 20, of the width of the conductor tracks. This reduces the probability of one of the contact pins falling into the insulation gap. However, the insulation gap can be chosen to be larger than the width of the tip of a contact pin of a current collector in order to avoid a short circuit between the conductor tracks 11 of the first polarity and the conductor tracks of the second polarity 12. The conductor tracks 11 of the first polarity are configured to be connected to a first output of a voltage source, for example, a positive terminal 13.The conductor tracks 12 of the second polarity are configured to be connected to a second output of a voltage source, for example, a negative terminal 14. Instead of a DC voltage, the conductor tracks 11, 12 can also be supplied with an AC voltage or a combination of DC and AC voltage. At least 70%, in particular at least 85%, and especially at least 90% or 95% of the area of ​​the current-carrying wall element can be covered by the first and second conductor tracks. The conductor tracks 11, 12 can be part of a support element 15 of the wall element 10 or, alternatively, be applied to the support element 15.

[0066] Fig. 3 Figure 1 shows a schematic representation of a wall element 10, which optionally has a coating 18. For example, the coating 18 can cover the conductor tracks 11, 12 applied to the carrier plate 15. Alternatively, the conductor tracks 11, 12 can be designed as part of the coating. In this case, the conductor tracks can, for example, have the same or a similar geometry as those described above and in Figure 1. Fig. 2 The conductor tracks shown are present. For attaching the cover 18 to the wall element 10, an edge-side keder rail 17 (or a keder profile) can be provided, into which, for example, a keder strip on the cover side is inserted. The keder strip can be made of silicone or aluminum, for example.

[0067] Fig. 4 shows a side view of a system with a wall element 10 and a current collector 20 attached to the wall element 10. Fig. 5 shows an enlarged view of the pantograph 20. Fig. 4 on the wall element 10. The wall element 10 has a carrier plate 15 and optionally a covering 18. The wall element 10 further has first electrical conductors 11 of a first polarity and second electrical conductors 12 of a second polarity, wherein the first and second electrical conductors 11, 12 are arranged alternately at least sectionally.

[0068] The current collector 20 has a plurality of at least two, and in particular at least three, contact pins 21a, 21b, 21c. The current collector 20 is designed to be attached to the wall element 10 such that at least one of the contact pins 21a contacts one of the first electrical conductors 11 and at least one other of the contact pins 21b contacts one of the second electrical conductors. A first contact pin 21a, a second contact pin 21b, and a third contact pin 21c of the plurality of contact pins can be arranged such that they lie on a circle, as shown below with reference to Fig. 6 This will be explained in more detail below. In current collectors known from the prior art for a presentation, sales or trade fair stand and / or for shopfitting with a current-carrying wall element, wherein the current collector is designed to be attached to the wall element, the wall element having a carrier plate and a covering plate, the contact pins are not replaceable.

[0069] To attach the current collector 20 to the wall element 10, the wall element 10 and the current collector 20 can be configured such that the current collector can be magnetically attached to the wall element. For example, the current collector 20 can be, as in Fig. 4 und 5 shown, have one or more magnets 32. The conductor tracks 11, 12 and / or the carrier plate can have a magnetic material so that the current collector can adhere to it.

[0070] The contact pins 21a-c of the current collector can be connected to a rectifier 22. The rectifier can be part of the current collector or part of an electrical load 5 that can be connected to the current collector. The rectifier 22 is configured to provide an output voltage of defined polarity based on an input voltage applied to at least two of the contact pins 21a-c. For this purpose, output pins 24a, 24b can be provided, to which an electrical load 5 can be connected. The rectifier can have at least three inputs 23a-c and two outputs 24a, b, each of the at least three inputs 23a-c being connected or connectable to a respective contact pin 21a-c. Exemplary embodiments of such rectifiers in the form of bridge rectifiers are described in Fig. 12 und 13 shown. Optionally, the rectifier 22, the current collector 20, and the electrical load 5 can form a unit 6. Optionally, the current collector 20 and the rectifier 22 can be part of the electrical load 5.

[0071] It is understood that the current collector or the contact needles may optionally have a contact spring 26 for the contact needles, as shown in Fig. 5 , in order to provide a defined contact pressure.

[0072] Fig. 6 bis 9 Figure 1 shows exemplary representations of arrangements of contact pins 21a-f on a pantograph 20. The pantographs 20 each have a plurality of at least three contact pins 21a-21f, wherein a first contact pin 21a, a second contact pin 21b, and a third contact pin 21c of the plurality of contact pins 21a-21f are arranged such that they lie on a circle 41. The circle 41 is shown in dashed guidelines, as this is only intended to describe the type of arrangement.

[0073] At the in Fig. 6 In the example shown, the current collector 20 has three contact needles 21a-c, wherein the first, second and third contact needles 21a-21c of the current collector 20 are arranged such that they form a triangle 42, in particular an acute-angled triangle, in particular an isosceles triangle, and in particular an equilateral triangle.

[0074] Fig. 10 shows a representation of the in Fig. 6 The current collector 20, or rather its contact needle arrangement, is shown in various positions and rotations A to E. In the background, the first electrical conductors 11 and second electrical conductors 12 of the wall element 10 are shown. The current collector 20 (more precisely, its contact needle arrangement) is configured to be attached to the wall element such that at least one of the contact needles 21a contacts one of the first electrical conductors 11 and at least one other of the contact needles 21b, 21c contacts one of the second electrical conductors 12. As can be seen from Fig. 10 It is evident that even with a multitude of different rotational states, at least one of the contact needles can always be in contact with one of the first electrical conductors 11, here the positive terminal, and at least one of the contact needles can always be in contact with one of the second electrical conductors 12, here the negative terminal. This applies even if, as shown in position C, one of the contact needles 21c lies in an insulation gap 19 between the conductors 11 and 12.

[0075] Here, a diameter of the circle can be 41 (cf. Fig. 6 ), on which the first contact pin, the second contact pin and the third contact pin are located, shall be less than or equal to the sum of a width 51 of one of the first conductor tracks 11 and a width 52 of one of the second conductor tracks 12, and optionally a width 53 of the intermediate insulation gap 19. As in Fig. 10 As shown at position E, two contact needles 21b, 21c can also be located on different conductor tracks 12 of the same polarity, with a third contact needle 21a located on a conductor track 11 of the opposite polarity. Optionally, the contact needles 21a-c can be arranged such that the distance between the first contact needle 21a and a straight line through the second contact needle 21b and the third contact needle 21c is greater than a width 51, 52 of one of the electrical conductor tracks 11, 12.

[0076] The following table shows exemplary combinations of conductor widths and circle diameters 41. An insulation gap with a width of 1 mm and a contact area of ​​the contact pins of 0.5 mm² were assumed. The first and second conductors 11, 12 can have the same conductor width. Leiterbahnbreite in mm Kreisdurchmesser d im mm 9 16-17 10 17-19 11 18-21 14 22-27 15 24-29 19 29-37 20 30-39

[0077] Fig. 11 Figure 1 shows another illustration of different arrangements of contact pins on a current-carrying wall element in various positions and rotations. In a particularly unfavorable case, however, as shown in Figure 2, the following can occur: Fig. 11 Position E is shown, for example, where the second contact pin 21b and the third contact pin 21c fall into the insulation gap 19 located between the conductor tracks 11, 12. In this special case, a power supply would not be possible without further modification. One possible solution is to combine a first and a second current collector with different rotational orientations of the contact pins 21a-21c, for example with the ones shown in Fig. 11 Position A and Position B are shown in the orientations. However, this would involve a considerable amount of material.

[0078] Fig. 11 Positions G to J show further exemplary solutions. As in Fig. 8 und 9 , as well as Fig. 11 As shown in position G, the current collector 10 can optionally have a fourth contact pin 21d. The fourth or further contact pin 21d can be located within the circle 41 on which the first, second, and third contact pins 21a-c are arranged. It is understood that such a further contact pin within the circle can also be used in combination with other contact pins, as for example in Fig. 7 This can be shown, provided for. This further improves the flexibility regarding the free positioning and rotation of the current collector relative to the wall element. In the Fig. 9 In the examples shown in Fig. 11G, the fourth contact needle can be located at a center of circle 41 and / or at a centroid of triangle 42 (these points coinciding for an equilateral triangle). Optionally, the fourth contact needle 21d can be

[0079] Optionally, the fourth contact needle 21d can be arranged at a distance from the center point of circle 41, as shown in Fig. 8 This has the advantage of reducing the probability that, for example, the contact pins 21a and 21d lie in a straight line 43 which runs parallel to a horizontal or vertical axis of the current collector 20. The inventors have recognized that the current collectors 20 are often arranged horizontally or vertically. Against this background, it can be advantageous to arrange the contact pins rotated relative to a horizontal or vertical axis of the current collector 20, as shown in Fig. 9 and Fig. 11 Position H is shown. This also has the advantage of reducing the probability that, for example, the contact needles 21a and 21d lie in a straight line 43 that runs parallel to a horizontal or vertical axis of the current collector 20. The use of a quarter contact needle 21d is optional here. In particular, exactly three contact needles can be provided in this case, so that the costs and manufacturing effort can be further reduced.

[0080] In a further embodiment, the current collector 20 can also have a fourth contact needle 21d, a fifth contact needle 21e, and a sixth contact needle 21f. The six contact needles 21a-f can be arranged in a hexagon, in particular as an equilateral hexagon or star. As in the Fig. 11 Position I and J shown in the examples can, in this case, even if two contact needles 21a and 21d are used, as in Fig. 11 Position I shown, or 21b and 21d, as in Fig. 11 As shown in position J, the contact pins fall into the insulation gap 19 and continue to establish an electrical connection with one of the first conductor tracks 11 and one of the second conductor tracks 12. A further advantage of this design is that, when the current collector 20 is attached to the wall element 10, at least two contact pins 21e, 21f contact one or more of the first electrical conductor tracks 11, and at least two contact pins 21b, 21c contact one or more of the second electrical conductor tracks 12. This can enable higher current flows and thus higher power outputs of an electrical device 5 connected to the current collector 20.

[0081] Fig. 12 shows a representation of a current collector 20 with an arrangement of three contact needles 21a-21c in conjunction with a rectifier 22. Fig. 13 Figure 1 shows a corresponding representation of a current collector 20 with an arrangement of four contact pins 21a-21d in conjunction with a rectifier 22. The examples shown depict a diode bridge rectifier, but other types of rectifiers can also be used. An advantage of this solution is its simple, cost-effective design, which is also easily scalable for a larger number of contact pins 21a-f. An output voltage of defined polarity is provided at outputs 24a, 24b, which can be supplied to an electrical load 5.

[0082] Fig. 14 Figure 1 shows a perspective view of a current collector 20 according to an embodiment of the present disclosure for an electrical consumer. Such a current collector can also be referred to as a needle connector. Further embodiments of current collectors 20 according to further embodiments of the present disclosure are shown in the perspective views in Figure 2. Fig. 15 und Fig. 16 shown.

[0083] The current collector 20 comprises a base body 60 and a needle holder 70. The needle holder 60 includes contact needles 21a-21d. While the current collector 20 can be designed such that the contact needles 21a-21d are individually replaceable, preferably a needle holder 70 is provided which includes the contact needles 21a-21d and in which the contact needles are replaceable as a group together with the needle holder 70. This simplifies handling. At the same time, a sustainable solution is provided, since it is not necessary to replace the entire current collector 20, but only the needle holder 70. The base body 60 of the current collector 20 can have a receptacle for receiving the needle holder 70, wherein the needle holder 70 is designed to be detachably inserted into the receptacle of the base body 60. In the perspective view in Figur 14 To put it simply, the needle holder 70 can be inserted into the base body 60 from above.

[0084] Further details of the exemplary pantograph 20 from Fig. 14 The following sections refer to the representations in Fig. 17A bis F explained. Here, it shows Fig. 17A a top view of the pantograph 20. Fig. 17B shows a cross-sectional view through the pantograph 20 in the Fig. 17A Cutting plane marked BB. Fig. 17C shows an enlarged section of Fig. 17B. Fig. 17D und Fig. 17E Each shows a side view of the pantograph 20. Fig. 17A .

[0085] The current collector 20 can have a locking mechanism 71 for the detachable fastening of the needle holder 70 to the base body 60. Fig. 17F Figure 1 shows the locking mechanism 71 in two different positions. In the position shown with dashed lines, the locking mechanism 71 is locked. The locking mechanism 71 can be designed as a type of impeller, with radially outward-projecting impeller elements 73 (see Figure 1). Fig. 17F ) in corresponding recesses 63 (see Fig. 17A The needle holder 70 engages with the base body 60 and locks or fastens it to the base body 60. The locking mechanism can have a rotary lock for actuation; in particular, the rotary lock can have a slot-shaped recess 72 for actuation. In particular, such a needle holder 70 can be attached to the base body 60 without tools.

[0086] As in Fig. 17E As shown, the contact pins 21a-21d can be arranged on a bottom side or first housing side, and the power connections 24a, 24b can be arranged on a top side or second (opposite) housing side. For example, the Fig. 13 The rectifier circuit 20 shown can be integrated into the current collector 20. This allows for a compact, easy-to-handle component.

[0087] The base body 60 can have a printed circuit board 65. The printed circuit board 65 can have the rectifier, as exemplified by the schematically depicted diodes or semiconductor devices 66 in the sectional view in Fig. 17 B and the side view in Fig. 17 which were shown.

[0088] Referring to Fig. 17B and the enlarged section as in Fig. 17C As shown, the current collector can have 20 electrically conductive spring pins 67. The electrically conductive spring pins 67 are preferably arranged on the same circuit board as the rectifier. This allows for a simple and cost-effective design. The electrically conductive spring pins 67 are configured to provide an electrical connection between the contact needles 21a-21d of the needle holder 70 and electrical contacts 24a, 24b of the base body 60. In the illustrated embodiment, a bridge rectifier, as shown in Fig. 13 shown, must be connected in between to provide an output voltage of defined polarity.

[0089] Fig. 18A und Fig. 18B Further illustrations show an electrically conductive spring pin 67 of the base body 60 and a contact needle 21A of the needle holder 70. The electrically conductive spring pins 67 can be designed to provide, on the one hand, an electrically conductive connection between the contact needle 21A and the circuit board 65. Furthermore, the current collector 20 can be configured such that the electrically conductive spring pins 67 also provide contact pressure between the base body 60 and the needle holder 70 when the locking mechanism 71 is locked. This provides additional security for the locking mechanism in the locked position.

[0090] As in Fig. 18A und Fig. 18 B As shown, the contact needles 21a-21f can each have a recess 29 at one end facing the respective electrically conductive spring pin, into which a head end 69 of the electrically conductive spring pin 67 projects. This provides additional lateral guidance. This particularly facilitates the insertion of the needle holder 70 into the base body 60.

[0091] Fig. 15 und Fig. 16 Figure 1 shows further exemplary embodiments of current collectors 20 with different configurations of the base body 60 and needle holder 70. For example, the base body 60 can have fastening elements 62 for attachment to an electrical consumer, as shown in Figure 2. Fig. 16 depicted.

[0092] In the example shown, the current collector has four contact needles, which are similar, for example, to the one in Fig. 12 The contact pins can be arranged as shown in the illustration. However, other arrangements or numbers of contact pins are also possible. In particular, the current collector 20 can be designed such that a straight line through the first and second contact pins 21a, 21b intersects a horizontal or vertical axis of the current collector at an acute angle, particularly at an angle of no more than 30°, particularly at an angle of no more than 15°, and particularly at an angle of no more than 5%. This reduces the probability that, when the current collector is in a horizontal or vertical orientation on a current-carrying wall element, several contact pins will fall into a gap between the first and second conductor tracks.

[0093] To better illustrate and distinguish the base body 60 from the other elements of the pantograph 20, the following are shown in Fig. 19 A-D und Figur 20 further representations of the basic body 60 from Figur 17 shown again separately. This shows Fig. 19A a top view of the basic body 60. Fig. 19B shows a cross-sectional view in the plane AA from Figur 19A. Fig. 19C Figure 1 shows another cross-sectional view through a drilled hole or screw hole 81 for screwing the base body to the circuit board 65. An example circuit board 65 for the base body is shown separately in Figure 2. Figur 21 The electrically conductive spring pins 67 on the circuit board 65 are also shown, which, in the assembled state, can pass through corresponding openings 82 in the base body 60.

[0094] Fig. 22 Figure 200 shows a flowchart of a process 200, particularly for a presentation, sales, or trade fair stand 100 and / or for shopfitting. In a first step S201, a current-carrying wall element, as described in the present disclosure, is provided. In a second step S202, a current collector, as described in the present disclosure, is provided, wherein the current collector has 20 replaceable contact pins 21a-21f. In a third step S203, the replaceable contact pins can be replaced. This may be necessary, in particular, if one or more of the contact pins were bent or otherwise damaged during a previous use of the current collector.In a fourth step S204, the current collector is attached to the current-carrying wall element in such a way that a first of the contact needles contacts one of the first electrical conductors and at least one other of the contact needles contacts one of the second electrical conductors.

[0095] In an optional further step S205, the position and rotation of the pantograph (or of an electrical device mounted on or connected to the pantograph) can be checked, and the position and / or rotation of the pantograph can be corrected. Step S205 can optionally be repeated iteratively until a desired position and rotational alignment are achieved. It is understood whether step S203 can also be repeated multiple times over the system's lifetime to ensure consistently reliable electrical contact. This further improves the flexibility in the assembly and design of such a presentation system. In particular, it is not necessary to predefine the position and angular orientation of the electrical devices, as these can be adjusted flexibly.

[0096] With the proposed solution, it is no longer necessary to replace the entire current collector. In the exemplary embodiment shown, the needle holder 70 can be released and removed from the current collector, for example, with the aid of a coin. In this example, the needle holder contains all four contact needles or their tips. Due to the design of the spring pins, the needle holder is lifted after the locking mechanism is released for easier removal. The electrically conductive spring pins can also be configured to lift the needle holder 70 relative to the base body 6) for easier removal. This part is then replaced with a new one, which is screwed back in using the coin. Preferably, the needle holder is rotationally symmetrical. Optionally, a corresponding receptacle in the base body 60 can also be rotationally symmetrical.Incorrect insertion is virtually impossible, making replacement very easy. This allows the circuit board of the main body, with its electronic circuitry, to continue to be used; only a small plastic part with four pins needs to be replaced.

[0097] It is understood that the embodiments described herein by way of example can also be applied in modified form, for example with a different number of contact needles, different dimensions, different distances between contact needles and surfaces and / or modifications of the geometric arrangement.

[0098] It goes without saying that the strictly vertically or horizontally oriented arrangements of the conductor tracks shown, as for example in Fig. 2 The figures shown are to be understood as examples, so that they can also be arranged thinner, thicker, at an angle, or in other shapes, such as circular or meandering, on the carrier element 15. For the operation of the electrical load 5, the current collector can interact with the conductor tracks arranged on the carrier element in such a way that at least one first contact pin can make electrical contact with one of the first conductor tracks and a second contact pin can make electrical contact with one of the second conductor tracks. Low-voltage systems, operating at 12 / 24 / 48 V and thus being safe to use, can be used for the power supply. However, it is also conceivable to use higher-voltage systems, i.e., systems with higher voltage, if necessary, by means of special insulators applied as lacquer, film, and / or other materials. For example,Due to the needle-shaped design of the contact pins, they can be repositioned almost any number of times without damaging the coating 18. Generally, the conductor tracks 11, 12 typically carry low current, for example 12, 24, or 48 V, so that the risk of injury when handling the proposed wall element 10, the current collector 20, or any electrical device 5 connected to it is virtually eliminated. The conductor tracks 11, 12 can be applied to the carrier plate 15, for example, by spraying, gluing, or welding. In particular, conductive inks can also be used for the conductor tracks 11, 12, which are sprayed or printed (e.g., by screen printing) onto the carrier plate 15.

[0099] It is also possible for the wall elements 10 to be not only flat, but also curved or arched. Modern magnets 6 enable magnetic forces of well over 80 kg, so that even large electrical appliances 5 or special presentation elements, such as shelves 11 (see Fig. 1 ), arranged electrical consumers 5 can simply be fixed to the respective wall elements 10.

[0100] The wall element 10 can also be designed flexibly, in particular being rollable or rollable, so that it can be used, for example, as wallpaper or as flooring. The wall element 10 can be constructed as a sandwich material, which in its structure incorporates the current-carrying conductor tracks 11, 12 and can be used or mounted / applied, for example, as wallpaper / carpet (roll material) or sheet material.

[0101] The sandwich construction can be carried out as follows: The coating 18 (surface material) is designed as a thin, penetrable, flexible material; behind it are the conductor tracks 11, 12 arranged on an insulating material; behind this is the carrier material 15 made of plastic and / or magnetic or magnetizable material, such as steel.

[0102] The current collector 20 and / or the electrical load 5 can also be intelligent or programmable. Data can be transmitted by modulating a signal onto one or both of the conductor tracks 11, 12 using so-called power line communication (PLC), wireless communication, or optical communication. For example, different current collectors 20 and / or electrical loads 5 can be controlled selectively. For instance, switching, dimming, or controlling individual loads 5 is possible. Furthermore, a bus system can be provided in which the electrical conductor tracks 11, 12, the current collectors 20, and / or the electrical loads 5 form part of the bus system, allowing individual loads 5 to be addressed or controlled independently.

[0103] Optionally, a wall element can also be designed to be applied under a wall covering, such as fiberglass wallpaper, and can be used, for example, in the area of ​​smart homes or in a museum, whereby electrical consumers, such as lighting equipment for pictures or other exhibits or monitors explaining the exhibits, can be supplied with electrical energy via the current collectors.

[0104] The proposed system can also be used in offices or private homes, where it can be installed, for example, beneath surfaces made of textiles, foil, wood veneer, or other wall materials. The current collectors allow for flexible power supply to electrical devices at different positions and, in particular, at different angles, without requiring numerous, potentially unsightly, electrical outlets. Especially when using a low-voltage system, this also improves safety for children and other occupants while simultaneously increasing flexibility.

Claims

1. System, in particular for a presentation, sales or exhibition stand (100) and / or for shop fitting, comprising - a current-carrying wall element (10) and - a current collector (20) for an electrical consumer (5), which is adapted to be attached to the wall element (10); wherein the wall element (10) comprises a carrier plate (15) and a coating (18) covering it; wherein the wall element (10) has first electrical conductor tracks (11) of a first polarity and second electrical conductor tracks (12) of a second polarity, wherein the first and second electrical conductor tracks (11, 12) are arranged alternately at least in sections; wherein the current collector (20) comprises a plurality of at least two contact needles (21a-21f), in particular at least three contact needles (21a-21f), wherein the current collector (20) is set up to be attached to the wall element (10) in such a way that at least one of the contact needles (21a-21f) contacts one of the first electrical conductor tracks (11) and at least one other of the contact needles (21a-21f) contacts one of the second electrical conductor tracks (12); and wherein the current collector (20) comprises a base body (60) and a needle holder (70); wherein the needle holder has the contact needles (21a-21f); characterized in that the base body (60) of the current collector (20) has a receptacle for receiving the needle holder, and the needle holder with the contact needles (21a-21f) is configured to be detachably inserted into the receptacle of the base body (60).

2. System according to claim 1, wherein the current collector (20) has a locking mechanism (71) for releasably fastening the needle holder (70) to the base body (60).

3. System according to claim 2, wherein locking mechanism (71) comprises a twist lock; in particular wherein the twist lock comprises a slot-shaped recess (72) for actuation.

4. System according to any one of the preceding claims, wherein the current collector (20) is set up in such a way that the needle holder (70) can be attached to the base body (60) without tools.

5. System according to any one of the preceding claims, wherein the base body (6= comprises a circuit board (65) with a rectifier (22) configured to provide an output voltage of defined polarity based on an input voltage applied to at least two of the contact needles (21a-21f).

6. System according to claim 5, wherein the rectifier (22) has at least three inputs (23a-23c) and two outputs (24a-24c), each of the at least three inputs being connected to a respective contact pin (21a-21c).

7. System according to any one of the preceding claims, wherein the needle holder (70) is rotationally symmetrical and wherein the base body (60) has a rotationally symmetrical receptacle for the needle holder (70).

8. System according to any one of the preceding claims, wherein the contact needles (21 a-21f) of the needle holder (70) are arranged around a centrally arranged actuating element of a locking mechanism (71) for releasably fastening the needle holder (70) to the base body (60).

9. System according to any one of the preceding claims, wherein the current collector (20) has at least three contact needles (21a-21f), in particular wherein the current collector (20) has between three and seven contact needles, in particular between three and five contact needles, in particular exactly four contact needles.

10. System according to any one of the preceding claims, wherein the wall element (10) and the electrical consumer (5) are set up in such a way that the electrical consumer can be magnetically attached to the wall element (10); and wherein the electrical consumer (5) has a receptacle for the current collector (20).

11. The system according to claim 10, wherein the electrical consumer (5) has a recess to receive the current collector (20); and wherein the electrical consumer (5) comprises a plurality of magnets arranged around the recess for magnetically attaching the electrical consumer to the wall element.

12. System according to any one of the preceding claims, wherein the contact needles (21a-21f) of the current collector (20) are arranged in such a way that, when the current collector rests on the current-carrying wall element (10) independently of a rotation of the current collector (20) on the current-carrying wall element (10), at least a first one of the contact needles (21a-21f) can be brought into contact with one of the first conductor tracks (11) and a second one of the contact needles (21a-21f) can be brought into contact with one of the second conductor tracks (12).

13. System according to any one of the preceding claims, wherein at least one of the contact needles (21a-21f) is designed such that a tip of the contact needle has an angle of between 60° and 20°, in particular between 45° and 25°, in particular of 30°.

14. Current collector (20) for an electrical consumer (5) in a system according to any one of the preceding claims, wherein the system is in particular a system for a presentation, sales or exhibition stand (10) and / or for shop construction, with a current-carrying wall element (10); wherein the wall element comprises a carrier plate (15) and a coating (18) covering it; wherein the wall element (10) has first electrical conductor tracks (11)) has a first polarity and second electrical conductor tracks (12) has a second polarity, wherein the first and second electrical conductor tracks are arranged alternately at least in sections; wherein the current collector (10) is a current collector for an electrical consumer, which is configured to be attached to the wall element (20); wherein the current collector (10) has a plurality of at least three contact needles (21a-21f), wherein the current collector (10) is configured to be attached to the wall element (20) in such a way that at least one of the contact needles (21a-21f) contacts one of the first electrical conductor tracks (11) and at least one other of the contact needles (21a-21f) contacts one of the second electrical conductor tracks (12); and wherein a first contact needle (21a), a second contact needle (21b), and a third contact needle (21c) of the plurality of contact needles are arranged such that they lie on a circle (41), and wherein the current collector (20) comprises a base body (60) and a needle holder (70); wherein the needle holder has the contact needles (21a-21f); characterized in that the base body (60) of the current collector (20) has a receptacle for receiving the needle holder, and the needle holder with the contact needles (21a-21f) is configured to be detachably inserted into the receptacle of the base body (60).

15. Method (200) for a presentation, sales or exhibition stand (100) and / or for shop construction, comprising the steps: - providing (S201) a current-carrying wall element (1); - providing (S202) a current collector for an electrical supply consumer who is set up to be attached to the wall element; wherein the wall element comprises a carrier plate and a coating covering it; wherein the wall element has first electrical conductor tracks of a first polarity and second electrical conductor tracks of a second polarity, the first and second electrical conductor tracks being arranged alternately at least in sections; wherein the current collector has a plurality of at least two contact needles, in particular at least three contact needles (21a-21f), wherein the current collector is set up to be fastened to the wall element in such a way that at least one of the contact needles contacts one of the first electrical conductor tracks and at least one other of the contact needles contacts one of the second electrical conductor tracks; wherein the current collector (20) comprises replaceable contact needles (21a-21f); and - changing the replaceable contact needles (S203); and - attaching (S204) the current collector to the current-carrying wall element in such a way that a first of the contact needles contacts one of the first electrical conductor tracks and at least one other of the contact needles contacts one of the second electrical conductor tracks.