Supply system for an electrical line, in particular for a charging cable for an electric vehicle

Abstract

The invention relates to a supply system (100) for cables (3) for charging electric vehicles, wherein a cable store comprises a plurality of pulleys (140) which are arranged in at least two pulley blocks (109, 110) such that a cable (3) can be threaded in multiple windings. One pulley block (110) is linearly guided relative to the other on a moveable pulley block carrier (113) and can be adjusted against a restoring force. According to the invention, the pulley blocks (109, 110) are mounted on one side and in a cantilevered manner and / or can be adjusted against the force of a deflected flexible spring element (21a, 21b) and / or each have multiple pulleys (140) distributed in an arc-shape over a circular arc.

Description

[0001] Feed system for an electrical cable, in particular for a charging cable for an electric vehicle

[0002] The invention relates to a feed system with a retrieval function or retrieval device for a line, in particular electrical lines or cables, in particular for cables for charging electric vehicles, comprising at least one cable storage device, wherein the cable storage device comprises a plurality of rollers which are arranged in at least two pulley blocks in such a way that a cable can be retracted into the pulley blocks in several turns, wherein a first pulley block and a second pulley block are adjustable or displaceable relative to one another, at least one of the first and second pulley blocks is arranged on a linearly guided, displaceable pulley block carrier, and the first and second pulley blocks are movable towards one another against a restoring force.

[0003] A feed system of the type described above is known, for example, from EP 3 271 983 B1. This document describes an electrical connection system for charging a motor vehicle battery, comprising a storage device for an electrical cable, comprising at least three reels arranged in two rows, and a chain of spring elements connected to the lower row and exerting a holding force that increases with the length of the cable and a restoring force that decreases with the storage of the cable, wherein spiral springs of different stiffness arranged in a row are provided as the spring elements. This arrangement is intended to ensure that an increasing holding force is generated as the cable is unwound, and a decreasing restoring force is exerted as the cable is fed back.

[0004] Further prior art is known, for example, from JP 2014230298 A, which comprises a cable feed system with a cable storage device in which rollers are arranged in two roller packages, from which the cable can be unwound under tension, wherein both roller packages are spring-mounted and can each be displaced against one another against the force of a tension spring. Another cable feed system is known from EP 2 813 455 A1, but this is primarily designed for network cables with a small cross-section. It is intended to allow easy installation and replacement of the cable, but is hardly suitable for cables for charging electric vehicles.

[0005] The known supply systems are designed in such a way that they must be provided to the user fully assembled with the corresponding cable. Any necessary replacement or repair of the electrical lines or cables is not taken into account in the design of the known systems. Depending on the charging technology and the provision of mains connections or network connection points, it may be necessary to equip the supply system with electrical lines that are designed for different voltages and / or different currents. This requires the installation of cables with different cross-sections. In addition, depending on the installation location, different electrical safety requirements apply or different plugs must be provided. It is therefore generally desirable for the user to be able to easily install electrical lines or cables themselves.

[0006] A first sub-object of the present invention relates to the provision of a feed system for electrical cables which is particularly simple and user-friendly with regard to maintenance and repair as well as with regard to assembly. The batteries of a motor vehicle are generally charged by connecting a battery charger provided in the vehicle to a voltage source, for example to a charging station which is connected to a power grid. When the motor vehicle is not being charged, it is generally desirable to stow the charging cable away. The cable storage systems described above offer the option of stowing several meters of a charging cable wound up on reels arranged in reel packages, the cable being arranged in several turns which are reeved into the reel packages like a pulley system.The free end of the cable, which is usually provided with a corresponding charging plug, is fed to the charging socket or power outlet of the vehicle by exerting tension on the free end of the cable and partially pulling the cable out of the cable storage unit. The extension of the cable corresponds to a multiple of the length of the individual threads or the individual sections of the cable between the rollers of the roller packages. In this way, it is possible to provide a compact cable storage unit from which the cable can be pulled out with relatively little force. Since the required pulling force is inversely proportional to the number of reeving units, it is guaranteed that the user can pull the cable out of the cable storage unit with the least possible force.

[0007] On the other hand, a certain restoring force should be generated when the cable is unwound so that the cable can be automatically retracted when stowed away. To ensure this, it is known in the art to apply the restoring force by means of weights and / or spring elements. In particular, the solution according to EP 3 271 983 B1 is based on exerting a holding force that increases with the length of the cable and a restoring force that decreases as the cable is retracted, this being achieved by springs of different stiffness that are connected or arranged in series. However, such an arrangement has the disadvantage that it requires a relatively large amount of installation space within the housing, in particular a great installation height.

[0008] US 2017 / 0203662 A1 describes another retraction system in a charging station for cables for charging electric vehicles, which, however, does not allow for simplified replacement of the charging cable.

[0009] The invention is therefore also based on the partial object of providing a feeding system of the type mentioned at the outset which, on the one hand, is relatively compact and, on the other hand, provides the user with the greatest possible operating comfort.

[0010] The first sub-task is solved according to a first aspect of the invention with the features of claim 1.

[0011] The second sub-problem is solved according to an independent second aspect with the features of claim 7.

[0012] A further, third object of the invention relates to an improvement of a feed system with a retrieval function or retrieval device for a line according to the preamble of claim 13.

[0013] Such systems with rollers arranged in an arcuate distribution have already been proposed in general in GB2574735A and in DE 10 2019 104 131 A1. Such systems have not yet been adopted for charging cables of electric vehicles and are partly unsuitable for this purpose. Instead, the susceptibility to errors should be reduced and the reliability of the feed system improved. This third sub-problem is solved according to an independent third aspect with the features of claim 13.

[0014] Advantageous embodiments of the invention result from the subclaims, which can in principle be combined with one another for all aspects and are also to be provided in combination as disclosed within the scope of the invention.

[0015] FIRST ASPECT (one-sided storage)

[0016] A first aspect of the invention relates to a feed system with a retracting function or retracting device for cables, in particular for cables for charging electric vehicles, comprising at least one cable storage device, the cable storage device comprising a plurality of rollers which are arranged in at least two roller packages in such a way that a cable can be retracted into the roller packages in several turns, a first roller package and a second roller package being movable or retractable relative to one another.are displaceable, at least one of the first and second roller packages is arranged on a linearly guided, displaceable roller package carrier, and the first and the second roller package are movable towards one another against a restoring force, wherein the feed system according to the first aspect of the invention is characterized, among other things, in that the roller packages each have an axis which is mounted or attached or supported on one side and in a cantilever manner.

[0017] The first roller assembly is preferably arranged in a stationary manner, preferably within a housing. In such a case, it is advantageous if the second roller assembly is displaceable on the roller assembly carrier with respect to the first roller assembly, e.g., is mounted so as to be relatively movable. The roller assembly carrier can, for example, be designed as a carriage guided by rollers or plain bearings. It is generally sufficient if only the second roller assembly is relatively movable, which simplifies the design.

[0018] The fact that the roller packages each have an axle that is mounted on one side in a cantilever manner is particularly advantageous because the roller packages are thus accessible from one side so that a cable can be laid on from one side without the cable having to be laboriously threaded through, as would otherwise be the case with closed roller blocks. Thanks to this construction, for example, the first roller package can be fastened to a wall on one side, whereas the second roller package can be mounted on an axle that is fastened on one side in a cantilever manner on a roller package carrier that is preferably designed as a carriage. In this way it is possible both to lay the cable on one side and to push individual roller discs or rollers onto the axle. The rollers or roller discs can also be mounted on ball bearings or plain bearings, and polymer bearings can also be provided for this purpose.

[0019] Cantilevered mounting in this case means, in particular, that the roller assemblies are supported or held on one side only, with a cantilevered section opposite, such as a cantilever beam. This makes the roller assemblies easily accessible from the free side, since no fastening or similar devices need to be removed.

[0020] The term "to thread into" or "reeving" or "reevingable" in relation to the pulley packages refers to an arrangement in which the cable is placed or inserted in several turns onto or into the pulley packages, similar to a pulley or cable pull (Engl, "block and tackle" or just "tackle").

[0021] According to one embodiment of the invention, the roller assemblies can be arranged, for example, in a housing. With such a configuration, the roller assembly carrier can be displaceably guided within the housing. It is advantageous if the housing has at least one guide profile, preferably several guide profiles, for guiding the roller assembly carrier. It is particularly preferred that the housing comprises two end profiles, preferably designed as feet, which each form a guide profile for the roller assembly carrier.

[0022] In one embodiment, the housing can accommodate electrical devices and / or components for charging electric vehicles and for this purpose can have, for example, a separate and / or sealed receiving area or a separate and / or sealed compartment, preferably with a suitable IP protection class. In one variant, the roller package carrier can have a C- or U-shaped cross-sectional profile that is open in the direction of the extension of an axis, so that the roller package or the roller disks are easily accessible from one side. The roller package carrier can be designed as a plastic profile that has two end faces, each forming a lateral leg of the roller package carrier, on which end faces, for example, guide rollers can be arranged.

[0023] The axles can each accommodate a plurality of individual, independently rotatable rollers, which can, for example, consist of identically designed roller discs, each of which is designed as a plastic injection-molded part.

[0024] It is particularly expedient and advantageous if the housing has user-removable housing parts designed so that the user can place the connected charging cable with the connected charging plug onto the rollers when the housing is opened. This ensures that the supply system according to the invention can be retrofitted, for example, to domestic installations without the user having to intervene in the live parts of the charging station.

[0025] The housing can have at least one cable inlet and at least one cable outlet, which are designed so that a cable connected at least on one side and provided with a charging plug can be placed on the rollers by the user without dismantling the charging plug(s) of the cable.

[0026] In this context, it is advantageous and practical if the housing can be opened easily by the user. With this type of housing configuration, an anti-theft device and / or a cable pull-out protection device are advisable.

[0027] Therefore, in an advantageous variant of the feed system according to the invention, at least one pull-out and removal safety device for at least one cable is provided, which, for example, comprises a cable guide with at least one electrically actuated

[0028] Locking mechanism includes .

[0029] The cable guide can, for example, comprise a cable duct in which a cable can be secured by means of a clamping shoe. The clamping shoe can, for example, be actuated by a servo motor via a spindle drive, which is arranged on the output shaft of the server motor.

[0030] According to a further advantageous embodiment of the invention, the roll package carrier is guided in at least one guide profile, preferably arranged centrally and furthermore preferably vertically in the installed position, which is designed as a guide frame or guide rail. This embodiment of the feed system according to the invention has the advantage that a housing is not required for the functionality of the system.

[0031] The feeding system according to this embodiment can comprise a guide rail for wall mounting, wherein one roller package can be fixedly attached to the guide rail, whereas the other roller package can be arranged on the roller package carrier and displaceable therewith in the guide rail.

[0032] Alternatively, the guide rail can be designed in the form of a guide frame with a base so that the feeding system can be freely positioned.

[0033] Finally, the guide rail can also be arranged within a housing, in which case the housing is not required for the functionality of the feeding system, but only provides a protective function and, if necessary, an anti-theft device.

[0034] The guide rail can, for example, be designed in the form of a C-profile or a U-profile. Alternatively, the guide rail can comprise one or more T-shaped or I-shaped guide webs, which can be encompassed by a compatibly designed contour of the roller assembly carrier.

[0035] SECOND ASPECT (return spring)

[0036] Another subject matter of the invention which is claimed as being capable of being protected relates to a feeding system with a reset or.Retrieval function for cables, in particular for cables for charging electric vehicles, comprising at least one cable storage device, the cable storage device comprising a plurality of rollers which are arranged in at least two roller packages in such a way that a cable can be retracted into the roller packages in several turns, a first roller package and a second roller package being displaceable relative to one another, at least one of the first and second roller packages being arranged on a linearly guided, displaceable roller package carrier, and the first and second roller packages being movable towards one another against a restoring force, the feed system being characterized in that the restoring force is generated by means of at least one elongate spring element which acts on the second roller package and extends over at least one fixed deflection point in at least two sections.This feeding system according to the second aspect may further comprise one or more of the features described in connection with the first aspect or further aspects of the invention.

[0037] In particular, the feature according to the invention that the elongated spring element is guided over at least one deflection point makes it possible to use a relatively thin and long, particularly flexible spring element which has a low spring constant. This results in a slow increase in the restoring force as the cable is extended. If the spring element has an approximately linear spring characteristic curve, a flat spring characteristic curve can be achieved over the entire extension length, so that the user has the feeling of applying an essentially constant tensile force when pulling out the cable. In fact, the tensile force will increase over the extension length when pulling out the cable. However, if the spring characteristic curve has only a relatively slight gradient, the user subjectively has the feeling that the tensile force to be applied is constant over the entire extension path.In this way, the user is provided with a high level of operating comfort.

[0038] Particularly preferred is a multiple deflection over at least two deflection points so that a particularly long dimensioned spring element, with several sections along the guide direction or direction of movement of the moving roller package, can be accommodated without increasing the installation space.

[0039] As a spring element , in particular a flexible , strand - shaped spring element comes into consideration which is elastically extensible as intended , preferably in the form of a rubber rope , rubber band , expander rope or the like . Suitable spiral springs are also within the scope of the invention , although less preferred .

[0040] Advantageously, the elongated spring element extends, preferably within the housing, in at least two approximately parallel sections. This allows a relatively long spring element to be accommodated within the housing without significantly increasing the installation space.

[0041] In a preferred and advantageous variant of the feed system according to the invention, the spring force is generated by means of at least one spring-elastic cable laid over at least one deflection pulley in at least one loop, which is provided as a spring element. Such a flexible cable, or expander cable, can be particularly advantageously attached, for example, to side panels of the housing or in a guide rail between profile webs of the guide rail.

[0042] Alternatively, such an expander cable can be guided over one or more deflection pulleys that are attached to a central guide rail. Even with this variant of the feed system, a housing is not absolutely necessary for the functionality of the feed system. By using one or more deflection pulleys, it is possible to lay the spring element or expander cable in several sections, which can preferably extend parallel to one another. Within the scope of the invention, a single elongated spring element can basically be provided, which is guided over a plurality of deflection pulleys, for example in the form of a parallelogram.

[0043] Preferably, however, the spring force is generated by means of two elongated spring elements which act on two sides of the second roller package in order to ensure symmetrical force introduction.

[0044] A rubber-elastic cable, in particular an expander cable, or a helical tension spring with a relatively thin wire gauge can be provided as the spring element. A non-metallic spring element in the form of a rubber-elastic and flexible cable is preferably provided as the spring element. This can, for example, have a core or a core made of a thermoplastic elastomer.

[0045] In an expedient variant of the feed system according to the invention, it is provided that the spring force is generated by means of two spring elements and that one spring element is attached to each of two sides of the roller package carrier, so that the force introduction by the spring elements into the roller package carrier is symmetrical.

[0046] Preferably, one free end of the spring element is fastened to a guide profile, a guide rail or to a housing part, whereas the other end of the spring element is fastened to one side of the roller package carrier, for example by means of a clamping thimble.

[0047] Preferably, each of the spring elements is guided over at least one upper and one lower deflection roller.

[0048] The at least one deflection roller or both deflection rollers can, for example, be mounted on the inside of the housing and / or be arranged in a fixed position on the housing or on a guide profile or a guide frame.

[0049] THIRD ASPECT (guided bow packages)

[0050] A further subject matter of the invention which is claimed as being protectable in itself relates to a feed system for an electrical cable, e.g. a cable for charging electric vehicles, comprising at least one cable storage device which comprises a plurality of rollers which are arranged in at least two roller packages in such a way that a cable can be laid or inserted or retracted into the roller packages in several turns, wherein a first roller package and a second roller package are displaceable relative to one another, e.g. movably mounted, and can be moved towards one another against a restoring force, similarly as explained above.

[0051] However, at least one of the two roller packages, in particular each of the two roller packages, has a plurality of rollers or cable guide rollers arranged in an arc around a deflection axis.

[0052] Preferably, each roller package is designed such that the cable can be wound into the roller packages in several turns or can be laid on them in several staggered turns. Each roller package has rollers that are preferably arranged and / or dimensioned such that they ensure a minimum deflection radius at the bent areas of the turns, which is preferably at least 800 mm, in particular at least 100 mm, so that undesirable bending stress on the wires or current conductors is minimized.

[0053] According to the third aspect of the invention, it is proposed that at least one of the first and second roller assemblies is arranged and held on a linearly guided, displaceable roller assemblies carrier. In comparison to known solutions, this results in stable guidance when the cable is pulled out and back, and also in easier assembly. Here, according to the third aspect of the invention, at least the one of the two roller assemblies which has a plurality of rollers arranged in an arc around a deflection axis is held on the linearly guided roller assemblies carrier or is carried by it.

[0054] A particular advantage of arcuately distributed rollers is that the two roller sets can be moved significantly closer to each other in a roughly semicircular or semi-disk-shaped configuration, or similarly, when fully extended. Compared to solid rollers like sheaves, this reduces the remaining unused or "dead" cable length in the cable storage, allowing a shorter charging cable to be used with the same extension length, or a longer extension length can be achieved.

[0055] Within the scope of the invention, a typical single-axis roller arrangement on the first roller package and arcuately distributed rollers only on the second roller package is also conceivable, wherein the first roller package can then engage with at least part of the roller circumference of the coaxial rollers in the second roller package.

[0056] However, particularly preferred are rollers distributed in an arc shape on both roller packages, so that largely identical roller packages can be adjusted in a 180° rotated arrangement relative to each other and at the same time a relatively large radius of the cable guide is ensured.

[0057] Preferably, the rollers in each of the two roller packages are distributed in an arc shape, in particular distributed over a circular arc. The radian dimension is advantageously 180°, so that both roller sets together form an approximately circular storage unit only when fully extended, i.e., at a minimal distance from one another. The arc measure is preferably at least 90°, more preferably 120°, depending on the roller diameter. The radius of the circular arc on which the roller axes are distributed is, for electric car charging cables, preferably at least 50mm, more preferably at least 75mm, and especially at least 100mm.

[0058] Depending on the roll diameter, at least four distributed roll groups are preferably provided in each roll package, preferably with at least one, in particular at least three rolls each, which are preferably evenly distributed around the circumference (distributed with the same arc spacing).

[0059] From a structural point of view, each of the two roller packages has an essentially semicircular frame, with axes distributed over the circular arc, and two axially opposite support elements on which the axes are held.

[0060] In order to reduce or minimize the offset of the cable during the transition from one roller package to the other, it is advantageous that successive rollers in the direction of the curve are mounted axially offset from one another, e.g. by offsetting the axes on the frame or the individual roller bearings on the respective axis by a few millimeters.

[0061] Preferably, each roller assembly has securing bars arranged on the outside relative to the distributed rollers. These can prevent the cable from radially detaching from the respective roller assembly. The securing bars are preferably detachable, in particular hinged to the frame, to facilitate the installation or subsequent replacement of the cable.

[0062] The securing bars can form a type of roller cage with the frame to securely hold the cable on the respective roller package.

[0063] In the third aspect, the first roller assembly is preferably arranged in a stationary manner, and the second roller assembly is displaceable relative to the first roller assembly on a linearly guided or movable roller assembly carrier. In this case, the roller assembly carrier is particularly preferably guided on or in at least one, preferably centrally arranged, guide profile, which is designed as a guide frame or guide rail.

[0064] In preferred combination with the first aspect, the second

[0065] Roller package one-sided and cantilevered, especially on

[0066] Roller assembly carrier mounted. Accordingly, it is also advantageous if the first roller assembly is mounted on one side and cantilevered, in particular on a housing or a guide rail of the roller assembly carrier.

[0067] The delivery system according to the third aspect may further comprise one or more features described in connection with the further aspects of the invention disclosed herein.

[0068] FURTHER ASPECT (gas spring)

[0069] A further aspect of the invention, which is also seen as protectable in itself but is purely optional, relates to a feed system for cables, in particular for cables for charging electric vehicles, comprising at least one cable storage device, the cable storage device comprising a plurality of rollers which are arranged in at least two roller packages such that a cable can be retracted into the roller packages in several turns, a first roller package and a second roller package being displaceable relative to one another, at least one of the first and second roller packages being arranged on a linearly guided, displaceable roller package carrier, and the first and second roller packages being movable towards one another against a restoring force. This independent aspect of the invention or of the feed system is characterized in that the restoring force is generated at least partially by means of at least one gas spring which acts on the second roller package.

[0070] The feed system according to this further aspect of the invention may also comprise one or more of the features described above or below as particularly advantageous. A gas spring may be provided with a deflected spring element as an alternative or in addition to the solution described above.

[0071] A gas spring in the sense of the present invention is understood to be a spring element which comprises a cylinder with a pressurised gas and a piston rod, wherein the leading end of the piston rod can have a piston or is designed as a piston which dips into the cylinder and is supported by at least one sealing means in a sliding manner against the cylinder wall and in the process compresses and / or displaces the gas contained in the cylinder.

[0072] In contrast to traditional mechanical springs, gas springs have a flat spring characteristic, even with very long strokes. This characteristic can be easily adjusted, for example, by installing appropriate openings and / or valves within the piston or piston rod. Furthermore, a gas spring can also be used to achieve a damping effect that is easily adjustable. This dampens and / or delays the return movement when the tension on the cable decreases, thus reliably preventing acceleration of the cable end when returning to the cable storage.

[0073] Due to the inventive design of the feed system, there is a slow increase in the restoring force with increasing extension length of the cable and a dampened return movement. According to the invention, a gas spring as the spring element can be used to achieve a flat spring characteristic curve over the entire extension length, so that the user has the feeling of applying an essentially constant pulling force when pulling out the cable. In fact, the pulling force will increase over the extension length when pulling out the cable. However, with only a relatively slight gradient in the spring characteristic curve, the user subjectively gets the feeling that the pulling force to be applied is constant over the entire extension path. In this way, the user is given a high level of operating comfort.

[0074] In an advantageous variant of the feed system according to the invention, it can be provided that the at least one gas spring is fastened on the one hand to the roller assembly carrier and on the other hand is operatively connected to an abutment. A housing of the feed system, for example, can serve as the abutment. However, other stationary fastening options or stop points are also suitable as abutments. Alternatively, it can be provided that the gas spring is fastened in such a way that the roller assembly carrier acts directly axially on the piston rod with a stop in the event of a displacement.

[0075] Preferably, the supply system according to the invention comprises at least one cable acting on the piston rod of the gas spring and connected to the housing, which cable acts on the piston rod of the gas spring by displacing the roller assembly support. This cable is expediently designed as a tensile cable that has no spring-elastic properties. This variant of the supply system has the advantage that the gas spring can be attached to the roller assembly support and can form a compact structural unit with it.

[0076] To ensure smooth and tilt-free guidance of the roller assembly carrier, which is designed as a slide, it is advantageous if two gas springs are attached to the roller assembly carrier in such a way that symmetrical suspension and / or damping of the roller assembly carrier is ensured. The gas springs can, for example, each be attached to a lateral leg of the roller assembly carrier.

[0077] A particularly advantageous, low-friction, twist- and tilt-proof guide for the roller assembly carrier within the housing is achieved when the roller assembly carrier is supported by a plurality of guide rollers against a guide profile or against the inside of the housing. The carriage or roller assembly carrier is therefore preferably mounted on a rolling rather than sliding bearings.

[0078] Particularly smooth guidance is achieved when the guide rollers are mounted on ball bearings. The ball bearings can, for example, be designed as deep groove ball bearings with a cage made of a thermoplastic material. Such polymer bearings are corrosion-free, as well as resistant to media and temperatures, and enable maintenance-free, low-friction, and hygienic dry running. Alternatively, the guide rollers can be mounted on self-lubricating plain bearings made of a thermoplastic material.

[0079] Furthermore, a cylinder is preferably attached to the at least one gas spring on the roller assembly carrier and the piston rod of the at least one gas spring engages with a first deflection roller in a loop of the cable in such a way that when the roller assembly carrier is displaced against the direction of action of the weight force, a piston of the at least one gas spring is displaced within the cylinder with compression and / or displacement of a gas volume.

[0080] It is particularly advantageous if the cable is attached at its ends to the roller assembly support and / or to the gas spring and is guided over a second, stationary deflection pulley, preferably in the housing. This arrangement ensures that the distance between the two deflection points or deflection pulleys remains constant when the gas spring is compressed, and the cable remains stretched.

[0081] GENERAL

[0082] The feed system has the function of automatically retracting the guided cable and can therefore also be referred to as a retraction system. It preferably provides an extendable cable length of at least 2 meters, but preferably at least 3 meters.

[0083] The supply system is generally used without a cable, but is particularly advantageous when combined with a cable, particularly a cable for charging electric vehicles. Cables for charging electric vehicles, e.g. those with purely electric drive (battery-electric vehicles) or with partially electric drive (plug-in hybrid vehicles), are particularly suitable for this purpose and comply with the usual standards. In Europe, for example, these cables are often designed with a plug that complies with the IEC 62196 standard or as a so-called Type 2 plug or, for example, as a so-called Combo 2 plug or coupling for DC charging with up to 240 kW at 200-600 V DC and up to 400 A DC. There are also other standards for plug connectors and charging cables.The charging cable is designed for a corresponding typical load of at least 10kW and preferably has a corresponding charging plug for an electric vehicle at the extendable end, in particular a charging plug according to standard IEC 62196-1 (2016) or standard IEC 62196-2 (2016) (e.g. Type 1 / Type 2 / Type 3).

[0084] Since the charging cable must transmit a high electrical power of typically at least 11 kW, usually at least 22 kW, appropriate wire cross-sections (e.g., typically 5 G 6 mm²), wire insulation, and a sheath with the necessary mechanical protection are required. This makes such a charging cable, with a typical total cable cross-section of 15 mm², correspondingly heavy and stiff, making it difficult to wind up by hand. The invention, in all its aspects, particularly for or with such charging cables, offers considerable ease of handling for the user and also simplifies and reduces the costs of manufacturing a charging column or charging station.

[0085] The invention is explained below without limitation with reference to and with reference to the embodiments shown in the accompanying drawings.

[0086] They show:

[0087] FIG.l a front view of a first

[0088] Embodiment of the feeding system according to the invention,

[0089] FIG.2 is a perspective view of the feeding system according to FIG.1,

[0090] FIG.3 is a perspective rear view of the feeding system according to FIG.1,

[0091] FIG.4A shows a cross section through the feeding system according to the first embodiment of the invention,

[0092] FIG.4B is a perspective view of the roller package

[0093] carrier from FIG.4A,

[0094] FIG.5 is a perspective view of a feeding system according to a second embodiment of the invention,

[0095] FIG.6 is a perspective view of the feeding system according to FIG.5 with the housing open,

[0096] FIG.7 a longitudinal section through the housing of the

[0097] Feeding system according to the second embodiment of the invention

[0098] FIG.8 is a perspective view of the feeding system according to FIG.5 or housing,

[0099] FIG.9 is a perspective view of the feeding system according to a third embodiment of the invention with the housing open,

[0100] FIG.10 is a perspective view of the feeding system according to the third embodiment of the invention without a housing,

[0101] FIGS. 11A-11D show representations of a particularly preferred fourth embodiment of the feed system according to a further third aspect of the invention as a cable retraction system in a retracted state of the cable, each in a front view (FIG. 11A) and a side view (FIG. 11B), as well as in the extended state of the cable, each in a front view (FIG. 11C) and a side view (FIG. 11D) of the cable retraction system; FIGS. 12A-12C show views of the roller cage or roller package with rollers distributed in a circular arc, in the closed state of the roller cage (FIG. 12A), in the open state of the roller cage in perspective (FIG. 12B) and in a side view (FIG. 12C); and

[0102] FIG.13 is a frontal sectional view through a support profile to illustrate the advantageous multiple deflection of the retraction ropes (expander ropes) to achieve a uniform retraction force, according to a principle similar to FIG.1-3.

[0103] Reference is first made to Figures 1 to 4, which show a first embodiment according to the invention. In the embodiments described below, identical or functionally equivalent components are designated by the same reference numerals.

[0104] The feed system 1 comprises a cable storage unit for a cable 3 as a charging cable for an electric vehicle. The cable storage unit of the feed system 1 comprises a first, upper, stationary roller assembly 9 and a second, lower roller assembly 10 that is displaceable relative thereto. The first roller assembly 9 is mounted on a first axis 11 that is cantilevered on a guide profile 34 of a frame 35, whereas the second roller assembly 10 is mounted on a second axis 12 that is cantilevered on a roller assembly support 13 that is displaceable while guided on the guide profile 34. The guide profile 34 is, as can be seen from Figure 4, designed as a profile rail with a C-shaped cross section, which is supported against the ground by means of a base plate 36 and is fastened to the ground.The roller assembly carrier 13, to which the movable roller assembly 10 is attached, is arranged displaceably within the guide profile 34, so that the roller assemblies 9, 10 can be moved toward and away from each other. The roller assemblies 9, 10 each comprise four individually independently rotatably mounted rollers 14, which in turn are composed of individual roller discs 15. The rollers 14 are each mounted on ball bearings 16, which are seated on the axles 11, 12.

[0105] The roller assemblies 9, 10, together with the cable 3 placed on them and wound in several turns, form a pulley system, wherein a pull on the free end 17 of the cable 3 (a plug is not shown for the sake of simplicity) causes the cable 3 to be pulled out in such a way that the roller assembly support 13 is lifted in the direction of the first roller assembly 9, wherein the cable sections located between the roller assemblies 9, 10 are shortened and the pull-out length of the cable 3 is increased. The distance by which the cable 3 can be pulled out is naturally a multiple of the distance between the roller assemblies 9, 10, wherein the force which must be applied in this case is a fraction of the force which acts on each individual section of the cable 3.

[0106] The roller package carrier 13 is designed as a holding plate with a U-shaped cross-section, to the legs 18 of which guide rollers 19a, 19b are fastened, which are guided inside the guide profile 34 between guide webs and the rear wall of the guide profile 34. In the example according to Figures 1 to 4, as Figure 4b shows, two groups each with four guide rollers 19a, 19b are provided, which are supported on the inside of the guide profile 34 in two vertical directions to prevent tilting. The guide rollers 19a provide support against tilting about the axis of rotation of the roller package 10, and the guide rollers 19b provide support against tilting about a horizontal axis perpendicular to the axis of rotation. Instead of a guide with rollers that engages the inside of the guide profile 34, a reverse arrangement is also possible, with a guide on the outside of a corresponding profile. However, the inside guide offers better protection for the guide.

[0107] The roller assembly support 13 can be displaced against the spring force of two expander cables 21a in the direction of the stationary upper first roller assembly 9. The expander cables 21a are fastened on the one hand to the rear of the roller assembly support 13 and on the other hand to the guide profile 34. Two deflection pulleys 20 for the expander cables 21a are arranged on the guide profile 34 at its upper and lower ends. The expander cables 21a, as spring elements which generate a restoring force for the roller assembly support 13, are guided at the top and bottom over the deflection pulleys in several mutually parallel sections.

[0108] A displacement of the roller assembly support 13 toward the first upper roller assembly 9 occurs counter to the spring force of the expander cables 21a, which generate a restoring force that increases proportionally to the cable extension path. Due to the fact that an expander cable 21a is guided over an upper and a lower deflection pulley 20, it is possible to provide relatively long spring elements with a relatively low spring constant in a space-saving manner. The resulting spring characteristic curve is relatively flat and gives the user the feeling that they can pull the cable 3 out of the cable storage unit with almost constant force.

[0109] The supply system 1 shown in Figures 5 to 10 according to a second and third embodiment of the invention comprises a cuboid-shaped housing 2 composed of several housing parts. The housing 2 accommodates a cable storage unit for a charging cable, which functions approximately similarly to the first embodiment.

[0110] The invention is of course to be understood in such a way that the type of cable for the supply system 1 is not important.

[0111] The housing 2 essentially comprises two end profiles 4 designed as feet, two side parts 5, of which only one is shown in the figures, and an upper housing cover 6. The housing 2 further comprises a cable entry 7 at the bottom of an end profile 4 and a cable outlet 8 on its front side.

[0112] The cable storage arranged inside the housing 2 comprises a first, upper, stationary roller pack 9 and a second, lower roller pack 10 which can be moved relative to the first roller pack 9. The first roller pack 9 is mounted on a first axis 11 which is fastened in a cantilever manner to a side part 5 of the housing 2, whereas the second roller pack 10 is mounted on a second axis 12 which is fastened in a cantilever manner to a roller pack carrier 13 designed as a carriage which can be moved in a guided manner inside the housing 2. The roller packs 9, 10 each comprise four individually independently rotatably mounted rollers 14 which in turn are composed of individual roller disks 15. The rollers 14 are each mounted on ball bearings 16 which are seated on the axis 11, 12.

[0113] The roller assemblies 9, 10, together with the cable 3 placed thereon and wound in several turns, form a pulley block, wherein a pull on the free end 17 of the cable 3 (a plug is also not shown in this exemplary embodiment for the sake of simplicity) causes the cable 3 to be pulled out in such a way that the roller assemblies support 13 is raised in the direction of the first roller assemblies 9, 10, the cable sections extending between the roller assemblies 9, 10 becoming shorter and the pull-out length of the cable 3 increasing. The distance by which the cable 3 can be pulled out is a multiple of the distance between the roller assemblies 9, 10, the force applied being a fraction of the force acting on each individual section of the cable 3.

[0114] As with the feed system 1 of the first embodiment, the first axis 11 and the second axis 12 are each fastened on one side and arranged in a cantilevered manner. The second axis 12 of the second roller assembly 10 is fastened to the roller assembly support 13, which has a C-shaped profile in cross section and has lateral legs 18 that are guided within the end profiles 4 of the housing 2 in a manner that prevents rotation or tilting.On each leg 18 of the roller pack carrier 13, six guide rollers 19a, 19b are arranged, namely a pair of first guide rollers 19a and four second guide rollers 19b, which guide the roller pack carrier 13 within the end profiles 4 of the housing 2 in two mutually perpendicular possible degrees of freedom, with two guide rollers 19a on each side of the roller pack carrier 13 being supported on an end face of an end profile 4 and four guide rollers 19b being supported against side faces of an end profile 4.

[0115] In the following, reference is first made to the second exemplary embodiment according to Figures 5 to 8, in which, as in the exemplary embodiment according to Figures 1 to 4, a restoring force for the roller package carrier 13 is generated by means of expander cables 21a.

[0116] As can be seen in particular from the illustration in Figure 7, deflection pulleys 20 are arranged on the inside of the end profiles 4 of the housing 2, over which pulleys an expander cable 21a is guided as a spring element. The expander cable 21a is fastened to a front profile 4 of the housing 2 at a first fastening point 22 by means of a first clamping thimble (see Figure 8) and, after being deflected twice around an upper and a lower deflection pulley 20, is fastened to a leg 18 of the roller package carrier 13 at a second fastening point 23 using a second clamping thimble. The roller package carrier 13 is displaced in the direction of the first upper roller package 9 against the spring force of the expander cable 21a, which generates a restoring force that increases proportionally to the extension path of the cable.

[0117] The third exemplary embodiment according to the invention is explained below with reference to Figures 9 and 10. The feed system 1 according to the third exemplary embodiment of the invention, like the feed system 1 according to the second exemplary embodiment of the invention, comprises a housing 2 which is designed approximately corresponding to the housing according to the second exemplary embodiment of the invention. The restoring force for the roll package carrier 13 according to the feed system 1 of the third exemplary embodiment is, however, generated by means of gas springs 24, as described below. On each of the lateral legs 18 of the roll package carrier 13, a gas spring 24 is provided which comprises a cylinder 25 filled with gas and a piston rod 26 which can be moved in the cylinder 25.The gas springs 24 are mounted on the roller package carrier 13 in such a way that the piston rods 26 each point upwards in the installed position and, when the cable 3 is pulled out of the feed system 1, compress against the direction of movement of the second roller package 10 and generate a predetermined restoring force.

[0118] The piston rod 26 comprises a piston which is slidably mounted in the cylinder 25 and sealed therein and is provided at its free end with a deflection pulley 27 which engages in a loop of a tensile and non-elastic cable 21b. The cable 21b is attached at a first attachment point 22 to the cylinder 25 of the gas spring 24 and at a second attachment point 23 to the lateral leg 18 of the roller assembly carrier 13. The cable 21b is deflected twice and is guided from the second attachment point 23 via a deflection pulley 20 fastened to the housing 2 in a loop over the deflection pulley 27 at a leading end of the piston rod 26 to the second attachment point 23 on the cylinder 25 of the gas spring 24.

[0119] Pulling on the cable 3 causes the second roller set 10 to move towards the first roller set 9, with the cable 3 being partially unwound from the cable storage thus formed. The cable 21b laid in the loop, which is fastened to the housing 2 via the deflection pulley 20, causes the piston rod 26 to actuate such that the gas spring 24 compresses, i.e. the piston rod 26 inserts into the cylinder 25. The fact that the cable 21b is fastened at its ends to the roller set support 13 and to the gas spring 24 ensures that the distance between the two deflection points or deflection pulleys 20, 27 remains the same when the gas spring 24 compresses, and that the cable 21b does not sag when it compresses.

[0120] The roller assembly carrier 13 is displaced toward the first upper roller assembly 9 against the spring force of the gas springs 24, which generate a return force that increases proportionally to the cable's extension travel. The resulting spring characteristic curve is relatively flat and gives the user the feeling that they can pull the cable 3 out of the housing 2 with a nearly constant force. Furthermore, the gas springs 24 dampen the return movement when the tension on the cable 3 is released and the cable 3 is rewound.

[0121] A further, particularly preferred embodiment is described below with reference to FIGS. 11-13. For the sake of brevity, the essential differences from previous examples are discussed here. Some features already described, some of which are designated by reference numerals increased by 100 and are recognizable from the figures, will not be explained again.

[0122] FIGS.11-13 show a retrieval system or feed system 100 for a Type 2 charging cable 3 for charging electric vehicles, with a cable storage device having a plurality of reels 140.

[0123] Here too, the rollers are grouped into two roller assemblies 109, 110 and arranged such that the cable 3 can be reeved into the roller assemblies 109, 110 or placed onto them in several turns (cf. FIGS. 11B / 11D). Here too, a first roller assemblies 109 is fixedly attached, e.g., screwed to a central support and guide profile 134 (cf. FIG. 11B). The second roller assemblies 110 is mounted so as to be vertically displaceable relative to the first roller assemblies 109. The second roller assemblies 110 is adjustable or movable, here vertically up and down, on the support and guide profile 134 by means of a carriage or carriage-like roller assemblies carrier 113, which is mounted on the support and guide profile 134 by means of a suitable roller bearing - e.g., analogous to FIGS. 4A-4B - as shown in FIG. 13.

[0124] Also in FIGS.11-13, the roller package carrier 113 is movable against a restoring force, which is generated by two repeatedly deflected elastic expander cables 21a, 21b, as shown in FIG.13. Each of the expander cables 21a, 21b is connected to the roller package carrier 113 via two spaced-apart

[0125] Deflection pulleys 20 (cf. FIG. 13) laid in at least one loop, so that each expander cable 21a, 21b forms two sections of a loop, which run along the guide direction, here essentially vertically, before the expander cables 21a, 21b engage the carriage or roller package carrier 113. This multiple deflection of the expander cables 21a, 21b, here via deflection pulleys 20 mounted at the ends on the support and guide profile 134, also ensures a uniform retraction force with a slight gradient of the spring characteristic, so that the spring force only increases slightly when the cable 3 is pulled out.At the other end, the expander ropes 21a, 21b are fastened to the support and guide profile 134 near the lower deflection rollers 20, so that the loops extend over 80% of the length of the guide profile 134, and the expander ropes 21a, 21b already have a length of approximately or more than twice the overall length of the guide profile 134, even in the fully retracted state.

[0126] A significant difference and advantage of the design of the fourth embodiment in FIGS. 11-13 is that at least one of the two roller assemblies 109, 110, in the example shown, each of the two roller assemblies 109, 110, has a plurality of rollers 140 arranged in an arc around a deflection axis, wherein roller groups with a plurality of rollers 140, here four rollers, are arranged in an arc around a circular arc. The second roller assembly 110, together with all of its rollers 140 arranged in a arc, is arranged on the linearly guided, displaceable roller assembly carrier 113 and is adjustable with the latter.

[0127] As shown in FIG. 11A and FIG. 11C, in each of the two roller assemblies 109, 110, the roller groups or rollers 140 are distributed over a circular arc whose arc measure is slightly less than 180°. In each of the two roller assemblies 109, 110, at least four, here five, roller groups are evenly distributed around an imaginary deflection axis that is perpendicular to the guide plane, which defines the guide profile 134 for the roller assembly carrier 113, see FIG. 11A and FIG. 11C.

[0128] As can be seen from the combination of FIGS. 12A-12C, each of the two essentially identical roller sets 109, 110 has an essentially semicircular frame 142 with axes 141 distributed over the circular arc. As best shown in FIG. 12C, each axis 141 supports four coaxial rollers 140.

[0129] All rollers 140 are preferably cable-friendly plastic rollers with an approximately semicircular cross-sectional profile for holding and guiding the cable 3 (see FIG. 12C), which is designed for cables with a cable diameter of at least 12 mm. The axes 141 of the roller groups are each held and fastened to two axially opposite, identical support elements 150 in a lattice construction, which define or predetermine the circular arc for the distributed axes 141 and can be manufactured as lightweight injection-molded plastic parts.

[0130] FIG. 12C further shows that successive rollers 140 in the arc direction are mounted axially offset from one another on the axes 141, so that any offset of the cable 3 during the transition from one roller set 109, 110 to the other is reduced or minimized (see FIG. HD). Each roller set is positioned offset from the next by a few millimeters so that the cable 3 has to overcome no or only a very slight offset at the transition from one to the other roller set 109, 110.

[0131] As shown in FIGS. 12A-12C, each frame 142 is designed to form a roller cage for securely holding the windings of the cable 3 on the rollers 140. For this purpose, each roller assembly 109, 110 has securing webs 151, also arranged in a circular arc, radially offset from the axes 141 of the distributed rollers 140. The securing webs 151 are hinged or pivotally mounted on one or both support elements 150 (shown open in FIGS. 12B-12C) and, in the closed state, as shown in FIGS. 12A and 12B, respectively, hold the cables firmly on the roller assembly 109, 110, so that the cable cannot come off, even if it is inserted by the user without moving the second roller assembly 110.

[0132] The roller cages with the roller sets 109, 110 have several functions. They serve to guide the line or cable 3. In contrast to solid rollers (see FIGS. 1-3), the roller cage enables the two roller sets 109, 110 with their imaginary deflection axes of the windings (see axes of the circular arc shape of the support elements 150) to move very close to one another. This shortens the required cable length for the retraction function. In other words, less cable length is required. The hinged safety bars 151 protect against the cable accidentally "jumping off." Multiple deflections allow for long cable extensions within a small system footprint.

[0133] The design, in combination with the central guide rail 134 and the one-sidedly supported or cantilevered design of the roller packages 109, 110 analogous to FIG.1-4, ensures easy filling of the system with the cable without the need for laborious threading.

[0134] As in FIG.1-4, FIG.11B / 11D show: the second roller assembly 110 is held with only one of the two support elements 150 on one side and cantilevered on the roller assembly support 113, and the first roller assembly 109 is fastened with only one of the two support elements 150, i.e. also on one side and cantilevered, to the guide rail 134 of the roller assembly support 13.

[0135] The guide rail 134 or guide profile 134, as in FIGS. 1-4, has a cross-section that is essentially C-shaped with recessed, inward-facing wing regions opposite the main surface. The guide profile 134 can be manufactured in the form of a support as a metal profile made of steel or aluminum and offers a robust, stable guide for the one-sided mounting of the slide-like roller assembly carrier 113 of the movable roller assembly 110. An advantage of the guide profile 134 is that this design can be used in a wide variety of housings or even without a housing.

[0136] Accordingly, a solution for automatically rewinding a cable 3 is proposed. This avoids dangers and cable damage caused by improper winding or cables 3 lying on the ground. The system 10, 100 is used in applications where a mobile device is connected to a cable 3 and has previously only been wound up manually, particularly in a charging station or wall box for an electric car. A slip ring is completely dispensed with.

[0137] Reference number

[0138] FIGS. 1-10

[0139] 1 feeding system 24 gas spring

[0140] 2 housings 25 cylinders

[0141] 3 cables 26 piston rod

[0142] 4 end profiles 27 pulley

[0143] 5 side panels 28 pull-out and

[0144] 6 Housing cover removal fuse

[0145] 7 Cable entry 29 Cable management module

[0146] 8 Cable outlet 30 Cable entry

[0147] 9 first roller package 31 clamping shoe

[0148] 10 second roller package 32 spindle drive

[0149] 11 first axis 33 servo motor

[0150] 12 second axis 34 guide profile

[0151] 13 roller package carrier 35 frame

[0152] 14 castors 36 base plate

[0153] 15 roller discs 37 protective rollers

[0154] 16 ball bearings

[0155] 17 free end of the cable

[0156] 18 Legs of the roller package carrier

[0157] 19a first leadership roles

[0158] 19b second leadership roles

[0159] 20 pulleys

[0160] 21a Expander rope

[0161] 21b (tensile) rope

[0162] 22 first attachment point

[0163] 23 second attachment point

[0164] FIG. 11A-11B, FIG. 12A-12C, FIG. 13

[0165] 3 charging cables (Type 2) 20 pulley

[0166] 21a, 21b Expander ropes

[0167] 100 feeding system

[0168] 109 first roll package 110 second roll package

[0169] 113 roll package carriers

[0170] 134 Support and guide profile

[0171] 140 rolls

[0172] 141 roller axle 142 semicircular frame

[0173] 150 support element

[0174] 151 Safety bridge (foldable)

Claims

Claims: Feeding system (1; 100) for an electrical line, in particular for a cable (3) for charging electric vehicles, comprising at least one cable storage unit, wherein the cable storage unit comprises a plurality of rollers (14; 140) arranged in at least two roller packs (9, 10; 109, 110) such that a cable (3) can be sheared into the roller packs (9, 10; 109, 110) in several turns, wherein a first roller pack (9; 109) and a second roller pack (10; 110) are displaceable relative to each other, at least one of the first and second roller packs (9, 10; 109, 110) is arranged on a linearly guided, displaceable roller pack carrier (13; 113), and the first and the second roller pack are movable towards each other against a restoring force, characterized in that the roller packs (9, 10) each have at least one axle (11, 12; 141) for rotatable mounting of the rollers (14), and the first and second roller packs (9, 10;109, 110) are mounted on one side and cantilevered or self-supporting, in particular with their respective axes (11, 12; 141) being mounted on one side and cantilevered or self-supporting. Feeding system according to claim 1, characterized in that the first roller assembly (9; 109) is arranged in a fixed position and that the second roller assembly (10; 110) is displaceable on the roller assembly carrier (13; 113) with respect to the first roller assembly. CORRECTED SHEET (RULE 91) ISA / EP Feeding system (1; 100) according to one of claims 1 or 2, characterized in that the second roller assembly (10; 110) is mounted on one side and cantilevered on at least one axis, which is attached to a roller assembly carrier (13; 113) preferably designed as a slide, wherein preferably at least one roller assembly (109, 110) has several rollers (140) arranged in an arc around a deflection axis and at least one of the first and second roller assemblies (109, 110) is arranged and held on a linearly guided, displaceable roller assembly carrier (113). Feeding system (1) according to one of claims 1, 2 or 3, characterized in that the roller assemblies (9, 10; 109, 110) are arranged in a housing (2).Feeding system (1) according to any one of claims 1 to 4, in particular according to claim 4, characterized in that the roller pack carrier (13; 113) is guided on or in at least one preferably centrally arranged guide profile (34; 134) which is designed as a guide frame or guide rail. Feeding system (1) according to claim 4 or 5, characterized in that the roller pack carrier (13; 113) is supported on the guide profile (34) via guide rollers (19a, 19b) and / or via sliding guides.Feeding system (1; 100) for an electrical line, in particular for a cable (3) for charging electric vehicles, comprising at least one cable storage unit, wherein the cable storage unit comprises a plurality of rollers (14; 140) arranged in at least two roller packs (9, 10; 109, 110) such that a cable (3) can be sheared into the roller packs in several turns, wherein a first roller pack (9; 109) and a second roller pack (10; 110) are displaceable relative to each other, at least one of the first and second. CORRECTED SHEET (RULE 91) ISA / EP Roller packages are arranged on a linearly guided roller package carrier (13; 113) that is displaceable along a guide direction, and the first and second roller packages are movable towards each other against a restoring force, characterized in that the restoring force is generated as a spring force by means of at least one elongated spring element which acts on the second roller package (10; 110) to exert the restoring force and extends over at least one deflection point in at least two sections. Feeding system (1) according to claim 7, characterized in that the restoring force is generated by means of at least one flexible spring element, preferably a spring-elastic rope (21), in particular by means of a flexible spring element, preferably a spring-elastic rope (21), laid over at least one deflection pulley (20) in at least one loop.Feeding system (1) according to claim 7 or 8, characterized in that the spring element is an elastic cord (21a) laid in at least one loop over at least one deflection pulley (20), and / or that the spring element or elastic cord (21a) is guided over at least two deflection pulleys (20) spaced apart from each other in the guide direction, with two sections of the loop extending along the guide direction. Feeding system (1) according to one of claims 7, 8 or 9, characterized in that the spring force is generated by means of two spring elements and that each spring element is fixed to the roller assembly carrier (13; 113), wherein the spring elements are preferably guided separately, in particular over two deflection pulleys (20) spaced apart from each other in the guide direction, each with two sections of the loop extending along the guide direction. Feeding system (1) according to claim 10, characterized in that. CORRECTED SHEET (RULE 91) ISA / EP the second roller package (10) of a roller package carrier, in particular a rolling or sliding linearly guided roller package carrier or sled (13; 113) is supported and the spring force is generated by means of two elongated, flexible spring elements (21) and that one spring element (21) is fixed to one of two opposite sides of the second roller assembly, in particular the roller assembly support or sled (13).

12. Feeding system (1) according to one of claims 7 to 11, characterized in that each of the spring elements is guided over at least one first and one second deflection roller (20), preferably over at least one upper and one lower deflection roller, which are provided in particular in a fixed position in one of the two end-side areas of the guide direction of the roller pack carrier (13; 113).

13. Feeding system (1) according to claim 12, characterized in that the first and / or second deflection roller (20) is or are fixedly mounted, in particular on a housing (12) in which the roller packages are received and / or a guide profile (34) on which the roller package carrier (13) is guided.

14. Feed system (100) for an electrical line, in particular for a cable (3) for charging electric vehicles, comprising at least one cable storage unit, wherein the cable storage unit comprises a plurality of rollers (140) arranged in at least two roller packs (109, 110) such that a cable (3) can be sheared into the roller packs (109, 110) in several turns, wherein a first roller pack (109) and a second roller pack (110) are displaceable relative to each other and can be moved towards each other against a restoring force, characterized in that at least one of the two roller packs (109, 110), preferably each of the two roller packs (109, 110), each has several rollers (140) arranged in an arc around a deflection axis and distributed over a circular arc. CORRECTED SHEET (RULE 91) ISA / EP that at least one of the first and second roller packages (109, 110) is arranged and held on a linearly guided, movable roller package support (113).

15. Feeding system (1) according to claim 14, characterized in that in each of the two roll packages (109, 110) the rolls (140) are distributed over a circular arc whose arc dimension K is 180° and / or at least four distributed roll groups are provided.

16. Feeding system (1) according to claim 14 or 15, characterized in that each of the two roller packages (109, 110) has a substantially semicircular frame (142) with axes (141) distributed over the arc of the circle, each of which supports at least one, preferably at least two rollers (140), and two axially opposing support elements (150) on which the axes (141) are held.

17. Feeding system (1) according to claim 14, 15 or 16, characterized in that successive rollers (140) in the direction of the arc are mounted axially offset from one another, so that an offset of the cable during the transition from one roller pack to the other is reduced or minimized and / or the rollers (140) are plastic rollers with a cable-protecting guide cross-section, in particular for cables with a cable cross-section > 15mm.

18. Feeding system (1) according to one of claims 14 to 17, in particular according to claim 16, characterized in that each roller package (109, 110) has securing ribs (151) arranged outside compared to the distributed rollers (140), preferably in an arc-shaped arrangement, which act against radial detachment of the cable from the respective roller package (109, 110), wherein the securing ribs (151) are preferably detachably, in particular hingedly, attached to the frame (142), in particular to the support elements (150), and / or wherein the securing ribs (151) preferably form a roller cage with the frame (142) for securely holding the cable. CORRECTED SHEET (RULE 91) ISA / EP 19. Feeding system (1) according to one of claims 14 to 18, characterized in that the first roller package (109) is arranged in a fixed position and that the second roller package (110) is displaceable on a linearly guided or movable roller package carrier (113) with respect to the first roller package (9).

20. Feeding system (1) according to claim 19, characterized in that the roller package carrier (113) is guided on or in at least one guide profile (134) which is designed as a guide frame or guide rail.

21. Feeding system (1) according to one of claims 14 to 20, characterized in that the second roller package (110) is attached on one side and cantilevered, in particular to the roller package carrier (13) , and that the first roller package (109) is attached on one side and cantilevered, in particular to a housing or a guide rail of the roller package carrier (13) .

22. Feeding system (1) according to one of claims 14 to 20, characterized by one or more of the characterizing features from one of claims 1 to 12. CORRECTED SHEET (RULE 91) ISA / EP

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