DE29810124U1 - Power transmission device and holding device therefor - Google Patents

Description

Description Power transmission device and holding device therefor

The invention relates to a power transmission device and a holding device for such
Power transmission devices, particularly for low-voltage systems, which allow selectable positioning of the holding devices on the power transmission devices.

There are a variety of different systems for attaching low-voltage lamps. For example, the individual low-voltage lamps are equipped with a fixed base, to which a power supply for the lamp can be provided via two contact connections. Current-carrying cables can be permanently connected to the contact connections. There are also known systems in which the contact connections can be connected to conductors or wires that are stretched through the room at a distance from a wall or ceiling and are in turn connected to a transformer via cables to provide low-voltage voltage. There are also systems, for example, in which lamps can be inserted into an opening in a suspended ceiling. Above this suspended ceiling, the voltage is supplied via cables that are routed there. While the current or voltage supply in conventional lighting systems can be provided directly from a light switch to the lamp via a cable, low-voltage systems usually require a transformer that can be installed either centrally in the wall, for example at the switch, or in the lamp base.

However, with all of these systems, the installation of lights is quite complex, as the light bases either have to be attached to a wall, for example with dowels, or recesses have to be made in the walls into which the light bases can be inserted. The installation of such

SR 28045 EN

As a result, lighting usually requires a lot of work, and expensive equipment such as drills must be available for installation. In addition, drilling holes to attach the base creates dirt, which in turn requires precautions to remove it or even to protect objects in the room in question. If the lighting is to be moved later or removed completely, the problem is that holes are left in the walls.

There are also lights with a clamp-like base. However, rods or edges of boards are required to attach them. The cable leading freely to a power connection is also a nuisance.

Although cables stretched across the room and run parallel to the lighting fixtures offer the advantage of being able to adjust the lighting fixture position along these cables as desired, this system has the disadvantage that the lighting fixtures can only be positioned along a one-dimensional path. In addition, the installation of such cables, which usually run at a distance from a wall, is often undesirable. This is particularly true for exhibition stands that have to be set up and dismantled frequently and whose walls have a wide variety of exhibits on display in different positions. There is also the risk of a short circuit caused by visitors to an exhibition stand who can inadvertently short-circuit the live conductors with a metal object.

If a lamp base is to be attached to an arbitrary position on, for example, a trade fair display wall, the problem often arises that the rear wall of the display wall is not accessible and therefore laying power cables to the position of the lamp causes problems.

The object of the invention is to provide a system or the individual components for such a system, with which any positioning of lights or similar low-voltage devices on a carrier body is made possible.

SR 28045 EN

This object is achieved by a power transmission device or a holding device according to the features of the independent claims 1 and 6.

The provision of a multi-layered current transmission material with at least one opening, preferably a large number of openings for receiving mounting elements, offers a large number of fastening positions, in particular for low-voltage lights. It is particularly advantageous that no separate current-carrying means have to be routed to the individual fastening positions. Both fastening and removing lights can be carried out quickly using simple means, whereby with an appropriate opening or hole arrangement in the form of a double-walled perforated sheet, an aesthetically pleasing surface of the transmission device remains even after a light has been removed or repositioned. Furthermore, the installation of lights on such a surface does not cause any waste or dirt.

Advantageous embodiments are the subject of subclaims. Dividing the conductor elements into several sections makes it possible, for example, to switch lights, fans and the like on and off independently of one another at different points on the transmission device. Non-circular openings in the conductor elements and a correspondingly shaped base of the holding device enable the holding devices to be locked in place like a bayonet lock, which enables particularly simple and reliable handling.

Embodiments of the invention are explained in more detail below with reference to the drawing.

Fig. IA a power transmission device in the form of a

two-dimensional transfer wall in plan view;

Fig. IB a cross-section through the wall according to Fig. IA

as well as two base pins for attaching power consumers to it;

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Fig. 2A and 2B show a transfer wall with an alternative embodiment of a mounting base in plan view and cross section respectively;

Fig. 3A in plan view a section of a

front layer of a transfer wall with receiving holes for fastening bayonet-shaped holding device fastening bases according to a further embodiment;

Fig. 3B shows a plan view of a section of a rear layer of the transmission device of Fig. 3A;

Fig. 3C and 3D a holding device for attachment to a

Transfer wall of Fig. 3A and 3B in side sectional view and rear view respectively;

Fig. 4A a cross section through two essentially

two-dimensional transmission conductors that are connected to each other by means of a special fastening device;

Fig. 4B and 4C show the interconnected transmission conductors according to Fig. 4A in two possible connection arrangements in plan view; and

Fig. 5A and 5B another embodiment in plan view

or in cross-section, with a transfer wall arranged on the underside of a mirror glass and the mirror having an opening for attaching a special lamp base.

As can be seen from Fig. IA and IB, the current transmission device 1, in particular in the form of a wall, has a multi-layer structure. The perforated sheet-like transmission wall 1 shown consists of two conductive, flat conductor elements 2 and 3, which are electrically separated from one another by means of an insulation layer 4. Depending on the application and strength requirements, the conductor elements 2, 3 can be made of solid metal sheets or relatively thin foils or even just conductor layers vapor-deposited on the insulation layer 4. The

SR 28045 EN

Conductor elements 2, 3 do not necessarily consist of a continuous layer, but can also consist of individual conductive elements with, for example, a grid-like arrangement. Accordingly, the insulation layer 4 can also consist of a variety of electrically insulating materials, which can be of different rigidity or elasticity and of different thicknesses depending on the application. The electrical connection of the two conductor elements 2 and 3 is made via two connecting wires 5, whereby the connection is preferably made in such a way that the front conductor element 2 is potential-free in the assembled state.

In order to be able to switch lights that are attached to different wall sections on and off independently of one another, for example, one of the conductor elements 2 and/or 3 can be made up of several pieces, with the individual segments 2 and 2' being electrically separated from one another, for example by an insulating layer 6. A further connecting wire 5' is used to supply power to the correspondingly separated conductor element section 2'.

For fastening and connecting a power consumer, at least one opening, preferably a plurality of holes 7, leads through the transfer wall 1. Of course, a transfer wall is also suitable in which holes can easily be made at desired locations, for example by perforating a film serving as a conductor element.

In the embodiment shown in Figs. IA and IB, a consumer is connected via two base pins or shafts 10, the front end sections of which are screwed into or onto a hole 7 in the transfer wall 1. Each of the shafts 10 has a threaded shaft on the front, the diameter of the shaft 10 being larger than the diameter of the holes 7, whereas the diameter of the threaded shaft 11 is smaller than the diameter of the holes 7. The threaded shaft 11 of the shaft 10 runs completely through a hole in the transfer wall 1 and into a threaded hole

SR 28045 EN

a nut 12 which is arranged on the back of the transmission wall 1 to tighten the shaft 10.

The first, ground-side shaft 10 rests with its front end on the outer surface of the conductor element 2, which surrounds the corresponding hole 7. This provides an electrical connection from the shaft 10 to the front-side conductor element 2. In order to prevent a short circuit between the front-side and rear-side conductor elements 2 or 3, the threaded shaft 11 of this shaft 10 passes through an insulating sleeve 13, which was inserted over the threaded shaft 11 or inserted into the corresponding hole 7 before the threaded shaft 11 was inserted into the corresponding hole 7 of the transmission wall 1. This electrically insulates the threaded shaft 11 from the inside of the holes in the conductor elements 2 and 3. Furthermore, an insulating disk 14 is arranged between the nut 12 and the rear conductor element 3 in order to also electrically separate the nut 12 from the conductor element 3, so that no electrical connection can be established via the rear conductor element 3, the nut 12 and the threaded shaft 11 to the front conductor element.

While the previously described shaft 10 is electrically connected to the front conductor element 2, the second shaft 10' is used to electrically connect an electrical consumer to the rear conductor element. To do this, its threaded shaft 11 leads from the shaft 10' first through an insulating disk 15 and then through an insulating sleeve 13. The insulating disk 15 insulates the front end of the shaft 10' from the front conductor element 2, while the insulating sleeve insulates the circumference of its threaded shaft 11 from the bore walls of the hole 7 in the transmission wall 1. The electrical connection of the shaft 10' to the rear conductor element 3 is made via the threaded shaft 11 and the conductive nut 12, which rests directly on the rear conductor element.

SR 28045 EN

According to an alternative embodiment, which is not shown in the figure, the threaded shaft II can also be screwed directly into the bore wall of the hole 7 of the transmission wall 1, provided that this has a corresponding internal thread. Such a fastening offers the advantage of not having to provide nuts 12 on the back of the transmission wall 1. In such an embodiment, for example, the diameter of a hole 7 in the front conductor element 2 would preferably be larger than the diameter of the threaded hole 7 in the lower conductor element 3 in order to connect the shaft 10' to the rear conductor element 3. This would create a distance between the threaded shaft 11 and the bore inner wall in the conductor element 2, which can prevent a short circuit. To connect the shaft 10, a threaded hole in just the front conductor element 2 would be sufficient. Here too, it would of course be possible to use an insulating sleeve that separates the threaded shaft from the front conductor element.

Instead of using an insulating sleeve and an insulating disk, an insulating sleeve with a outwardly flanged collar can also be used, which takes over the function of the insulating disk. The use of separate insulating disks for the rear insulation of the nut 12 from the conductor element 3 can also be done by a nut that is made of a non-conductive material or is coated with a non-conductive material. The lamp base can also be held with a magnet on the front conductor element 2 (as the first pole), whereby the lamp base (or other low-voltage device) can then be moved along the transfer wall 1 and engages in one of the holes 7 for connection to the second pole, namely the rear conductor element 3, e.g. with a small, spring-loaded locking ball in the (single) shaft 10.

As can be seen from Fig. 2A and 2B, in the second embodiment, a substantially hollow-cylindrical holding device is used to connect an electrical device to

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only a single hole 7 in the transmission wall 1. This holding device 20 consists essentially of a tubular outer conductor 21, the diameter of which is larger than that of a hole 7, so that it rests on the front conductor element 2 at a distance from the hole circumference and creates a first, preferably ground-side, electrical connection. An inner conductor 22 leads through the outer conductor 21, which also leads further through the hole 7 and into a nut 23 which, like the nuts mentioned above in the first embodiment, is used to tighten the holding device

20 on the transmission wall 1. At the same time, a second electrical connection to the electrical consumer is made via the nut 23 and the inner conductor 22 screwed into it. An insulating sleeve 24 is used to electrically separate the inner conductor 22 from the inner wall of the hole 7. An insulating sleeve 24 is used to electrically separate the outer conductor

21 and the inner conductor 22 is an insulating ring 25, wherein the outer conductor 21 and the inner conductor 22 are preferably firmly connected to one another via this insulating ring 25 in order to be able to clamp the outer conductor 21 to the transmission wall 1 via the insulating ring 25, the inner conductor 22 and the nut 23.

Alternatively, a slot for a screwdriver can be formed in the bottom of a hollow inner conductor 22 for tightening with the nut 23, provided that the outer conductor 21 can be pre-tensioned over the outer circumference of the inner conductor 21 towards the transmission wall. The magnet mentioned above can also preferably be used here, whereby the inner conductor 22 would have the aforementioned locking ball towards the rear conductor element 3.

The holding device 20 described above can already be part of a lamp base in this form, but can also be designed as an adapter piece, as shown. To connect and firmly connect a consumer to this adapter, the outer circumference of the outer conductor has, for example, an external thread 26.

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In a third embodiment in Figures 3A to 3D, the holes in the transmission wall are not circular, and the foot of a base 30 of a holding device has a correspondingly adapted structure. The through hole through the front or, in the figure, upper conductor element 2 is not circular, but in particular polygonal, as shown, for example, as a triangular hole 8. The through opening through the insulation layer (not shown) preferably has the same dimensions and dimensions as that of the hole 8 through the conductor element 2.

In the rear or lower conductor element 3, a substantially circular hole 9 is formed to accommodate a base foot 33. In the preferred embodiment shown, stops 9' protrude inwards from the peripheral wall of the circular hole 9.

A socket that can be inserted into a transmission wall designed in this way and locked in a bayonet-like manner

30 is shown in Fig. 3C and 3D in a sectional view and a view from below. Essentially, the base 30 is constructed in a similar way to the holding device 20 of the second embodiment and consists of an outer conductor

31 and an inner conductor 32 inserted therein. The outer conductor 31 is in turn dimensioned such that, when installed, it rests on the conductor element 2 around the hole 8 and thereby simultaneously provides a first electrical connection to one of the two poles. The inner conductor 32 in turn protrudes from the front side of the outer conductor 31, whereby the inner conductor 32 does not have an external thread on its front end section, but rather the base foot 33. The external dimensions of the base foot 33 are designed to match the hole 8 in the upper or front conductor element 2 so that the base foot 33 can be passed through the hole 8 as well as possible. The distance between the base foot 33 and the front side of the outer conductor 31 corresponds to the height of the conductor element 2 and the insulation layer 4 underneath.

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For the use of a base 30 in differently dimensioned conductor elements 2 and/or insulation layers 4, the inner conductor 32 with the base foot 33 can also be mounted so that it can be pushed out of the outer conductor 31, in which case a fixed adjustment by means of a screw engagement or an elastic loading of the base foot 33 in the direction of the outer conductor 31 can take place.

To insert the base 30 into such a perforated sheet-like transfer wall, the base foot 33 is passed through the hole 8 in the front conductor element 2 and the insulation layer 4, whereupon the base foot is rotated over the inner shaft 32 or over the entire base 30 in the hole 9 in the rear conductor element 3. In Fig. 3A and 3B, the insertion position of the base foot 33 is shown in dotted lines, while the position of the base foot 33 in the locking position is shown by a dashed line. As can be seen from Fig. 3A, the base foot 33 lies partially below the conductor element 2 and the insulation layer 4, so that the base 30 cannot be moved out of the hole 8. To remove the base 30, it is simply rotated back into the insertion position and then pulled out of the hole 8.

As can be seen from Fig. 3B, the stops 9' in the hole 9 of the rear conductor element 3 have two stop walls which run in such a way that two pivoting limits are provided for the base foot 33. As a result, the base foot 33 can be rotated to the stop after insertion into a locking position in which it lies optimally under the insulation layer 4 and the front conductor element 2. The second stop wall of the stop 9 is designed in such a way that the base foot 33 can be pivoted back into the insertion position in such a way that when the base foot 33 is rotated back, a stop position is created in which it can be easily lifted or pulled out through the hole 8 in the front conductor element 2.

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As can be seen from Fig. 3C, the base foot 33 not only forms a locking means for the base 30, but also the contact element for an electrical contact with the lower conductor element 3. The hole 9 in the lower conductor element 3 does not need to be designed as a through hole, but can also be designed as a cavity within the conductor element 3. A through hole with a circumferential shape described here through the entire transmission wall would also be sufficient if the base foot 33 can be clamped under its rear surface.

The inner conductor 32, as shown, leads into the outer conductor, whereby these two are spaced apart by means of an insulating ring 35. In the embodiment shown, a bolt 36 made of an electrically insulating material leads through a hole that leads through the outer conductor 31, the insulating ring 35 and the inner conductor 32. The inner conductor 32 is thereby firmly connected to the outer conductor 31. Instead of the connection by means of the bolt 36, any other type of connection, such as an adhesive connection or a magnetic holder, can of course also be selected, particularly when mounted horizontally on a plate as the transmission device 1. In embodiments in which the distance of the base foot 33 from the front side of the outer conductor 31 is to be adjustable, the insulating ring 35 can, for example, have an internal thread that engages with an external thread on the outer circumference of the inner conductor 32. It is also possible to apply elastic pressure to a thread-free inner conductor 32 relative to the outer conductor 31, so that the base foot 33 is always pre-tensioned in the direction of the front face of the outer conductor 31. By means of such an adjustability of the distance from the base foot 33 to the front face of the outer conductor 31, the locking after the base foot 33 has been rotated in the hole 9 of the rear conductor element 3 can be further improved compared to the embodiments of bases with a fixed distance between the base foot 33 and the outer conductor 31.

SR 28045 EN

In Fig. 4A to 4C, a transmission device 1 extending essentially in the form of strips is shown in the form of multi-layered, elongated strips 40. Two such strips 40, here again with, for example, the holes 8 described in the third embodiment, are connected to one another by means of a connecting device 41 of particular importance. The connecting device 41 consists essentially of a short strip 42, which, like the strips 40, has a multi-layer structure consisting of a first conductor element 2'', an insulation layer 4 and a second conductor element 3". The short strip 42 has two holes 43, which are designed here as through holes. To connect two strips 40, a screw 44 is inserted through the hole 8 of one strip 40 near the end, the shaft of which is then guided through one of the holes 43 of the short strip 42 and through a nut 45, by means of which the strip 40 and the short strip 42 are braced. In the same way, the second strip 40 is connected to the short strip 42 by means of another screw 44 and another nut 45.

The electrical connection of the rear conductor element of the first strip 40 with that of the second strip 40 is made directly via the conductor element 3" of the short strip 42 which is adjacent to these conductor elements 3 of the strips 40. The electrical connection of the front conductor element 2 of the first of the strips 40 is made via the screw 44 and the nut 45 to the second conductor element 2'' of the short strip 42 and from there analogously via the second nut 45 and the second screw 44 to the front conductor element 2 of the second strip 40.

To prevent a short circuit, the shaft of the screws 44 passes through an insulating sleeve 46, which electrically separates the shaft of the screws 44 from the rear conductor element 3 of the strips 40 and the correspondingly connected conductor element 3" of the short strip 42. While flat transfer walls 1 can also be connected to one another using such a connecting device, the strips 40 shown have the particular advantage that they, as

SR 28045 EN

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shown in Fig. 4C, can be attached to one another at an angle. Of course, other locking mechanisms can also be used here, such as the bayonet-like closure of the third embodiment, as already indicated by the triangular hole shapes in Fig. 4B and 4C.

5A and 5B show a fourth embodiment in which the transmission wall 1 is attached to a parallel wall. In the present embodiment, this further wall is a mirror 60, the surface of the conductive conductor element 2 or preferably a fully or partially reflective layer 61 that is vapor-deposited onto the mirror glass serving as the reflective surface behind the glass pane of the mirror 60. To connect a light to the transmission wall 1, an opening 63 is formed in the mirror 60, which allows access to the transmission wall 1. In a preferred embodiment, the light or another electrical consumer has a specially designed base 64.

The base 64 has a front base plate 65 which is large enough to preferably completely cover the opening 63 in the mirror 60 and its outer edge rests on the mirror 60. An opening leads through the base plate 65 for fastening it to the transmission device 1 and to the mirror 60. From the rear side of the transmission device 1, a screw 66 is guided through a correspondingly located through hole 7 for fastening, the screw head of which is supported on the rear wall or the conductor element 3. The shaft of the screw 66 leads further through a coil spring 67', a rear base plate 67, an insulation layer 68 and the opening in the base plate 65, as well as a washer and contact washer 69 into a nut head 70. By means of the screw 66 and the nut head 70 as well as the washer 69, the base plate is clamped to the mirror 60 and the transmission wall 1 attached to it.

SR 28045 EN

The electrical connection to the power consumption, which is carried by the base 64, is made on the one hand from the rear conductor element 3 via the screw 65 and the washer and contact washer 69, which can also be formed in one piece with the nut head 70, to the base plate 65, from which a first shaft 71 protrudes for carrying a lamp, for example. In order to prevent a short circuit with the other components, the shaft of the screw 65 leads to the washer and contact washer 69 through an insulating sleeve 73.

On the other hand, a further electrical connection of a light on the base 64 is made via a second shaft 72, which passes through a further opening in the base plate 65 and is connected to the lower base plate 67 or is formed in one piece with it. The insulation layer 68 serves to insulate the lower base plate 67 from the base plate 65, and an insulation ring 74 serves to insulate the second shaft 72 from the base plate 65. The electrical connection from the lower base plate 67 to the front conductor element 2 is made via the coil spring 67'. Lights or other electrical consumers on a mirror 60 or another plate can thus be connected to a transmission wall 1 through an opening 63 therein, which in turn can be connected in its edge region to a transformer or a power network via cable 5.

The above-mentioned embodiments are only examples of a large number of different types of power transmission devices and holders, which can also be combined with and among each other. For example, one or both of the conductor elements 2/3 of a transmission wall 1 can also be made of a bent metal, for example corrugated iron or the like. Transmission walls can be used alone or in conjunction with other building elements or boards as wall elements, ceiling elements, shelves, table tops and the like.

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With the help of suction cups or magnets, such "walls" can also be removably attached to glass or metal surfaces.

Furthermore, a large number of different types of holding devices can be used, with clips, clamp-like or plug-like elements being mentioned as further examples. The holding devices can also be attached to a transmission wall not only from one side, but from both sides, which is particularly advantageous for display walls for trade fairs. As an exemplary alternative to the current transmission wall of the third embodiment with the differently shaped openings in the conductor elements, a transmission wall can also be used, for example, in which the rear conductor element remains unprocessed and in which a base foot can be inserted into an opening that is open in the area of the insulation layer towards the rear conductor element.

In the case of transmission walls with separate conductor element sections, it is also possible to use three or more conductor elements 2/3 with respective insulation from one another in order to connect different consumers or low-voltage devices to the front and rear, for example for signal transmission, or to be able to switch them on separately from one another at the front or rear.

To connect the conductor elements 2/3 to a voltage source, it is not necessary to use permanently connected cables. Cables can also be connected like lamps using an adapter piece, for example. It is also possible to connect an induction device that enables inductive transmission of an alternating voltage and subsequent transformation and rectification. In the preferred version as a perforated sheet, LED lamps can also be inserted into the individual openings 7 in order to create lettering or instructions, especially when used in exhibition stand construction.

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Claims (1)

Expectations : 1. Power transmission device for connecting low-voltage consumers, in particular low-voltage lights, the power transmission device having at least two electrically separated conductor elements (2, 3), characterized in that the at least two conductor elements, in particular perforated plates (2, 3) with an insulating element (4) arranged between them form a multi-layer transmission device (1) in which at least one opening (7; 8, 9), in particular a plurality of openings (7; 8, 9) for receiving holding devices (10; 20; 30; 41; 64) for connecting low-voltage consumers is or can be formed. 2. Power transmission device according to claim 1, characterized in that the conductor elements (2, 3) of at least one of the layers of the transmission device (1) are divided into several sections (2, 2'), each of which is separately switchably connected to a voltage source. 3. Power transmission device according to claim 1 or 2, characterized in that the opening(s) (8) in the first conductor element (2) and preferably in the insulation element (4), in particular for receiving a suitably shaped holding device (30) in the manner of a bayonet lock, are non-circular. 4. Power transmission device according to claim 3, characterized in that the opening(s) (9) in the second conductor element (3) are also non-circular. 5. Power transmission device according to claim 3 or 4, characterized in that in the region of the opening(s) (9) in the second conductor element (3) at least one stop (9') for a locking element (33) of the holding device (30) is formed. 6. Holding device for connecting low-voltage consumers, in particular low-voltage lamps, to a power transmission device SR 28045 OE (1), in particular according to one of the preceding claims, wherein the power transmission device (1) has a layer structure of at least two conductor elements (2, 3) electrically separated from one another by an insulation element (4) and in this at least one opening (7; 8, 9), in particular a plurality of openings (7; 8, 9) is formed for receiving such holding devices (10; 20; 30; 41; 64). 7. Holding device according to claim 6, characterized in that at least one conductive shaft (10'; 22; 32; 66, 70) is designed to be insertable into an opening (7; 8, 9) for fastening to the power transmission device (1) and for electrically connecting a low-voltage consumer to the second conductor element (3), wherein the shaft (10'; 22; 32; 66, 70, 72) can be electrically connected to the second conductor element (3) through the opening (7) and can be fixed separately from the first conductor element (2). 8. Holding device according to claim 6 or 7, characterized in that at least one conductive shaft (10; 21; 31; 71) for fastening to the power transmission device (1) and for electrically connecting a low-voltage consumer can be inserted into an opening (7; 8) on the first conductor element (2) or can be coupled to a further shaft (22; 32; 66, 70) that can be inserted into an opening (7; 8, 9), wherein the shaft (10; 21; 31; 71) can be electrically fastened separately from the second conductor element (3). 9. Holding device according to claim 7 or 8, characterized in that the shaft (10, 10'; 21; 31; 65, 71) has an end face for supporting on the first conductor element (2). 10. Holding device according to one of claims 7 to 9, characterized in that the shaft (10, 10'; 22; 32; 60, 70, 72) has a protruding threaded shaft (11) for insertion into the corresponding opening (7), the threaded shaft being in the opening (7) or by means of a nut (12) behind the SR 28045 EN second conductor element (3) or can be fixed therein, in particular screwed. 11. Holding device according to one of claims 6 to 10 for fastening to a power transmission device according to one of claims 3 to 5, characterized by a shaft base (33) with a non-circular peripheral shape, in particular a peripheral shape adapted to the shape of the opening (8, 9), which can be guided through the opening (8, 9) in at least the first conductor element (2) and can be locked in a bayonet-like manner in an area (9) behind it by means of a twist. 12. Holding device according to one of claims 7 to 11, characterized in that insulating disks (14 or 15; 25; 35; 68, 74) and/or insulating sleeves (13; 24; 73) can be placed on the shaft or shafts (10, 10', 11; 22; 66) for electrical separation. 13. Holding device according to one of claims 7 and 8 to 12, characterized in that the two shafts (21, 22) are designed to be substantially coaxial with one another. 14. Holding device according to one of claims 6 to 13, characterized by a multi-part support plate (65, 68, 67) which can be fixed to an opening (7) of a power transmission device (1) by means of a threaded shaft (66), wherein a part, in particular the first side (65) of the support plate facing away from the power transmission device (1), can be electrically connected to the second conductor element (3) facing away from the support plate via the threaded shaft (66) and wherein another part, in particular the second, facing side (67) of the support plate, is spaced from the first conductor element (2) by means of an elastic element (67') and can be electrically connected to it. 15. Holding device according to claim 14, characterized in that the first part (65) of the support plate is disc-shaped and in particular for placement on an edge of an opening (63) in SR 28045 EN a plate (60) which is fastened to the power transmission device (1). 17. Power transmission device for connecting a holding device for low-voltage consumers according to one of claims 6 to 16. 18. Connecting device for power transmission devices according to one of claims 1 to 5 or 17, characterized by a multi-layer connecting element (42) with in particular the layer structure of the power transmission devices (40) and with at least two openings (43) which can be connected by means of at least one fastening element (44, 45) for connection to an opening (8) in one of the two power transmission devices (40), wherein the power transmission from the respective facing sides (3", 3) of the connecting element (42) and the power transmission devices (40) takes place by preferably direct contact and the power transmission from the respective opposite sides (2", 2) takes place via the fastening elements (44, 45). SR 28045 EN