Energy chain and side panel with side stabilization

Abstract

Energy supply chain (1) for guiding lines, such as cables, hoses, or the like, between two connection points, with a number of chain links (10) each comprising two opposing tabs (102), wherein in at least some chain links the tabs (102) are connected to each other via at least one crossbar (11), wherein each tab has a tab body (101), in particular a one-piece tab body made of plastic, with two overlapping sections and an intermediate central section, wherein two tabs connected in a longitudinal direction (L) of the energy chain (1) each overlap with corresponding overlapping sections and are pivotably connected to each other about a pivot axis (A), and the energy chain (1) is movable in such a way that it forms a loop consisting of a lower run (2), an upper run (3) and a deflection area (4) connecting them, wherein each tab (102) has a first retaining projection (131) and a second retaining projection (132) on its central section, and each tab (102) has at its end on one overlap section a first guide area (121) extending parallel to the pivoting plane and at its end on the other overlap section a second guide area (122) extending parallel to the pivoting plane, wherein, for lateral stabilization of each pair of longitudinally connected tabs (L), one tab (102) engages with its first guide area (121) behind the first retaining projection (131) of the other tab (120), and the other tab (102) engages with its second guide area (122) behind the second retaining projection (132) of one tab (120), characterized in thatthat the second retaining projection (132) is designed for snap-fit ​​connection with the second guide area (122) and is formed on an elastically deformable locking tongue (133).

Description

[0001] The invention relates generally to the field of energy chains for the dynamic guidance of cables between two relatively movable connection points. Energy chains typically have chain links with two opposing tabs (also called side tabs or side pieces), which in at least some of the chain links are connected to each other by at least one, usually two, crossbars, either permanently or detachably. The chain links define an internal receiving space for guiding cables, such as cables for electrical signal or power supply, or pneumatic or hydraulic hoses.

[0002] The present invention relates to the design and construction of the chain links individually, and in particular links made of plastic, preferably by injection molding. Two types and designs have proven particularly successful in energy chains made of plastic links.

[0003] In the first type, the energy chain, as described, for example, in WO 95 / 04231 A1, has two link strands, each composed of two different types of links: alternating inner and outer links, each with a different design. The inner links have overlapping areas facing the inside of the chain, while the outer links have overlapping areas on the outside. Adjacent links overlap on one side with their overlapping areas and are articulated to each other in a suitable manner, allowing them to pivot relative to each other in a plane about a pivot axis. This pivoting connection is typically achieved by a bolt / bore or a pin / receptacle swivel joint. Each link of the first type is typically largely flat in plan view, with end-side overlapping areas lying in the same plane.

[0004] Further developments of such an energy supply chain with alternating inner and outer links were proposed, for example, in WO 2020 / 152349 A1.

[0005] In a second type, the energy chain has two link strands, each composed of identical, so-called cranked links, primarily made of plastic. Such a link, as shown, for example, in patent DE3531066C2 or US 4,813,224 A, has a first overlap area on the inside and a second overlap area offset laterally or cranked outwards relative to this. In plan view, the cranked link usually has a contour similar to an elongated Z-shape. Cranked links are also pivotally connected to each other in one plane with overlapping areas on one side, typically via a pivot joint with a pin / receiver. The cranked links of one strand are designed to be mirror-symmetrical to the cranked links of the other strand; that is, a left and a mirror-symmetrical right link are required.

[0006] The proposed invention is applicable to tabs made of plastic, regardless of the design, and in particular to both of the aforementioned types or designs in principle equally.

[0007] In energy chains, for example in cantilevered applications (where the upper run spans freely above the lower run), as well as with long travel distances or in horizontal applications, lateral forces or moments occur that require high lateral stability of the link connection. However, it is essential to prevent the link joints from separating due to lateral forces during operation.

[0008] To improve lateral stability, the applicant proposed a solution in patent EP 0 803 032 B1 and US 5,980,409 A. This solution proposes that, in pairs of consecutive tabs in the tab string, one tab engages with a circular arc-shaped guide area extending parallel to the pivot plane into a clearance behind a projecting retaining projection of the other tab. The engagement of the guide area of ​​one tab behind the retaining projection on the other tab results in greater lateral stability. Such a principle can be described as a "rear engagement."

[0009] This (considered most obvious) prior art for increasing the lateral stability of energy chains by gripping the tabs from behind, as proposed in EP 0 803 032 B1 or in WO 2020 / 152349 A1, has proven itself in practice.

[0010] However, it has become apparent that, depending on the type and geometry of the tabs, assembling or linking them into a tab string is quite cumbersome and difficult for assembly personnel to perform manually, and is hardly automatable. Furthermore, depending on the geometry of the tabs, the often desirable double-sided engagement – ​​i.e., on both the side of the tabs facing away from and towards the receiving area – is structurally difficult to achieve.

[0011] A primary objective of the invention is therefore to propose an improved design for the link of a generic energy chain with lateral stabilization by means of a rear grip. The solution should simplify the assembly of the links and, in particular, facilitate the longitudinal joining of the links to form a continuous link strand.

[0012] A typical energy chain is used for the dynamic guidance of supply lines, such as cables, hoses, or the like, between two connection points, at least one of which is movable, particularly relative to the other connection point. The energy chain has a number of chain links, each comprising two opposing tabs, with the tabs of at least some chain links being connected to each other via at least one crossbar, e.g., every second chain link (half-crossbar energy chain) or every chain link (full-crossbar energy chain).

[0013] Each chain link (here referred to simply as a link) has a link body with two overlapping sections and an intermediate central section. Two links connected in one longitudinal direction of the energy chain can each overlap with corresponding overlapping sections and are pivotally connected to each other about a pivot axis. For this purpose, one overlapping section typically has a pivot pin and the other overlapping section typically has a pivot receptacle to form a pivot joint between the links or chain links.

[0014] The energy chain is movable in such a way that it forms a loop consisting of a first run, a second run, and a deflection section connecting these runs. In the predominantly vertical arrangement, i.e., when the chain moves in a vertical plane, it typically has an upper run that runs above a lower run. The upper run is usually connected to the movable connection point, but this is not always the case.

[0015] In energy chain designs with a rear grip, each link has a first retaining projection on the central section, which projects into one overlap section, and a second retaining projection, which projects into the other overlap section. Furthermore, each link has a first guide area at its end on one overlap section, which preferably extends parallel to the pivoting plane and is arc-shaped, and a second guide area at its end on the other overlap section, which preferably extends parallel to the pivoting plane and is arc-shaped.

[0016] To stabilize the sides of two longitudinally connected tabs, in the case of a double rear grip of two hinged tabs, one tab engages with its first guide area behind the first retaining projection of the other tab, and conversely, the other tab engages with its second guide area behind the second retaining projection of the first tab.

[0017] According to a key concept of the invention, it is proposed that at least one, and in particular exactly one, of the two aforementioned retaining projections, e.g., the second retaining projection, is designed for snap-fit ​​connection with the corresponding guide area. For this purpose, the retaining projection designed for snap-fit ​​connection can be formed, in particular, on an elastically deformable detent tongue or can also be designed to be elastically adjustable in another way as intended.

[0018] The elastically adjustable retaining projection according to the invention enables a type of snap connection, i.e., this retaining projection can form a detachable or permanent, positive-locking connection with the corresponding guide area. This is achieved in particular by the retaining projection, or a region supporting it, deforming elastically, and subsequently the guide area becoming detachably or permanently engaged with the retaining projection.

[0019] Because one of the two retaining projections for the snap connection is designed with the corresponding guide area of ​​the tabs to be joined, assembly can be significantly simplified. In particular, it is no longer necessary to maintain a predefined relative alignment or inclination of the tabs to be joined, as was required with previously known designs with a double-sided rear grip.

[0020] The invention is particularly preferably applicable to tab bodies made of plastic, especially one-piece tab bodies manufactured as injection molded parts.

[0021] In a preferred embodiment, it is provided that the other retaining projection of each tab, e.g., the first one, is not elastically adjustable but rigidly designed. In particular, one of the retaining projections of the tab can be formed immovably with the overlap section, so that only the other, e.g., second retaining projection is designed for snap-fit ​​connection with the second guide area and is formed on an elastically deformable detent tongue.

[0022] Preferably, the locking tongue has a substantially arc-shaped curved profile around the pivot axis of the associated overlap section when viewed in the pivot plane. The elastically adjustable locking tongue preferably includes a locking lug that is substantially straight or linear in the vertical direction of the tab and which at least partially forms or encompasses the second retaining projection. The second retaining projection can be formed exclusively as such a locking lug, which is adjustable by means of the locking tongue. Particularly in combination with such a locking lug, it can be provided that the locking tongue terminates freely at a locking lug that forms the second retaining projection.

[0023] The locking lug or adjustable retaining projection can be integrally connected to the tab body on its three other sides, preferably being integrally connected to the tab body on both sides in the vertical direction. This results in a stable construction and enables good lateral retention force, even under higher lateral forces.

[0024] For an easy-to-operate but durable snap connection, it is advantageous if the locking tongue, especially when viewed in longitudinal section of the tab, has a geometry that tapers towards the adjustable (second) retaining projection.

[0025] In a mechanically advantageous design, the locking tongue is designed as a leg of a U-shaped cantilever design viewed in longitudinal section of the tab and is formed by two mutually opening recesses in the tab body, wherein at least one recess lies in the overlap section and is preferably designed in a circular arc shape around the pivot axis of the associated overlap section.

[0026] The retaining effect can be enhanced by the adjustable (second) retaining projection having an effective height dimension of at least 25%, preferably at least 33%, of the outer height of the tab. The invention allows for a relatively large dimension of the adjustable (second) retaining projection thanks to its adjustability.

[0027] In a preferred embodiment, the first retaining projection of each tab is rigid or non-elastically deformable under typical operating forces, while only the second retaining projection, with its elastically deformable locking tongue, is adjustable for snap-fit ​​connection. Particularly preferably, both are manufactured as a single piece, preferably of the same material, with the tab body.

[0028] In a cost-effective embodiment, the tabs are designed as cranked tabs with a first overlapping section at one end pointing away from the receiving space of the chain links and a second overlapping section at the other end pointing towards the receiving space, wherein the first overlapping section is laterally offset relative to the second overlapping section. The first retaining projection extends into the second overlapping section, and the second retaining projection extends into the first overlapping section – particularly when viewed from the side. The projection into each overlapping section can be limited to the smallest possible area to ensure stable engagement from behind.

[0029] The effective overlapping area of ​​the rigid (first) retaining projection and the elastically adjustable (second) retaining projection can be approximately the same size, whereby the effective overlapping area of ​​the elastically adjustable (second) retaining projection can be at least 50% or more of the effective overlapping area of ​​the rigid (first) retaining projection.

[0030] Additionally or alternatively, it is provided that the articulated links of the successive chain links in the longitudinal direction are each designed with a constant chain pitch and a constant (maximum) outer height of the link, and that the links are designed such that the ratio of outer height to chain pitch is less than or equal to 0.9 or ≤ 90%, and in particular less than or equal to 0.8 or ≤ 80%. A correspondingly relatively large chain pitch allows for a more cost-effective overall production of the chain, as fewer chain links are required per chain length. This can be achieved, particularly in injection-molded parts, by appropriately dimensioning the central section between the approximately circular overlap sections, resulting in distinctly elongated, rounded chain links with a large distance between the pivot axes.The longitudinal dimension of the central section can, for example, represent a proportion of the total longitudinal length of the tab, particularly when considered in the longitudinal center plane of the tab, which corresponds to at least 20%, preferably at least 30%, of a corresponding longitudinal dimension of one of the overlapping sections. The two overlapping sections of a tab preferably have substantially identical longitudinal dimensions, particularly when measured in the longitudinal center plane.

[0031] Typically, the articulated links of the successive number of chain links in the longitudinal direction of the chain form two chain-longitudinal link strands comprising a first link strand and a second link strand.

[0032] Particularly with cranked links with a large chain pitch, but also regardless of this, it is advantageous if cranked links in both link strands are connected to each other longitudinally along the energy chain, and if the links in the second link strand are identical in design to the links in the first link strand, but are rotated 180° around the vertical axis of the link relative to the link opposite it in the chain link. In other words, the same links can be used in both link strands, i.e., in the left and right link strands. This allows for particularly cost-effective manufacturing using injection molding and simplifies warehousing and assembly.

[0033] Preferably, the tabs each have a fastening projection on the inside of each narrow side for detachable fastening with crossbars, in particular crossbars of a known or already existing design.

[0034] In an energy chain for long travel distances, in which one strand can slide or roll on the other, an inner narrow side of the tabs is directed towards the inside of the loop and an outer narrow side is directed towards the outside of the loop, wherein the inner narrow sides of the tabs in an extended configuration have a running surface on which the opposite strand can slide or roll.

[0035] Particularly in the case of a sliding or rolling chain for long travel distances, it is advantageous if the first retaining projection of each link is arranged off-center between the narrow sides, asymmetrically with respect to a longitudinal center plane of the link, and preferably offset against the pivot direction around the pivot axis or towards the outer narrow side. Additionally or alternatively, it is advantageous if the second retaining projection is arranged centrally between the narrow sides, preferably symmetrically with respect to a longitudinal center plane of the link. An asymmetrical arrangement of one retaining projection relative to the other simplifies the realization of a larger running surface on the inner narrow side or allows for smaller deflection radii without collision of the running surface components with the retaining projection.

[0036] For a material-saving tab design with simultaneously high tab stability, it is preferably proposed that the first circular guide area has a reduced or stepped wall thickness compared to the overlap section, and / or that the second circular guide area has a reduced or stepped wall thickness compared to the overlap section. The first and second guide areas are particularly preferably each integrally connected to a circumferential radial outer reinforcing ring of the respective overlap section. Such a reinforcing ring in the overlap sections ensures good stability of the tab itself, and especially of the respective back-engagement by the guide area into the other tab, even with a partially minimized tab wall thickness.

[0037] Particularly in combination with an asymmetrical design of the rigid or first retaining projection with respect to a tab longitudinal center plane, it is advantageous if the rigid or first retaining projection is dimensioned to a limited extent in the circumferential direction around the pivot axis, so that the corresponding guide area is only overlapped by the first retaining projection over a portion of its arc length or angular amplitude and is not overlapped by the retaining projection over another portion of its arc length or angular amplitude.

[0038] In addition, but also independently of this, it is advantageous for lateral stability if the first and second retaining projections and the corresponding guide areas are designed in such a way that the guide area engages in a free space behind the retaining projection essentially over the entire swivel angle around the swivel axis.

[0039] The invention further relates to a tab in itself (per se) which is suitable for an energy supply chain for guiding lines, such as cables, hoses, or the like, between two connection points and comprises a number of chain links, each having two opposing tabs, wherein in at least some chain links the tabs are connected to each other via at least one crossbar.

[0040] The generic tab has a tab body, in particular a one-piece tab body made of plastic, with two overlapping sections and an intermediate central section, wherein the overlapping sections correspond to the overlapping and pivotable relative to each other about a pivot axis, in particular articulated, connection of two tabs connected to each other in a longitudinal direction of the energy supply chain.

[0041] The tab of this type further comprises a first retaining projection on its central section, which projects into one overlap section, and a second retaining projection, which projects into the other overlap section. At its ends, the tab has a first guide area and a second guide area at each of the overlap sections. These guide areas preferably extend parallel to the pivot plane and are at least predominantly arc-shaped.

[0042] The middle section refers in particular to that part of the tabs which lies between the overlapping sections, connecting them longitudinally and thus not in lateral overlap with another tab in the tab strand.

[0043] According to a key concept of the invention, it is proposed that one of the retaining projections, e.g., the second retaining projection, is designed for snap-fit ​​connection with the second guide area of ​​an identical tab. For this purpose, a retaining projection that is adjustable for the snap-fit ​​connection, particularly in the longitudinal direction of the energy chain, can be formed, especially on or as part of an elastically deformable locking tongue.

[0044] The proposed tab can advantageously be further developed by one or more of the advantageous features described above relating to the tab, or by one or more features from one of the appended dependent claims. All features of the energy chain, the chain link, and in particular the tab presented above as advantageous are each, individually or in combination, to be considered essential to the invention and can, in particular, be made the subject of a divisional application. In principle, advantageous features of all aspects described herein and of the dependent claims can be combined with one another and, in such combination, are also to be understood as essential to the invention in themselves.

[0045] An energy chain, in particular a sliding chain, as defined in the invention is particularly, but not exclusively, advantageous for use in long travel distances, e.g. travel distances longer than 20m, in particular longer than 50m.

[0046] One of many possible industrial applications is energy supply chains on crane systems, especially on cranes for port facilities such as ship unloading cranes.

[0047] Further features and advantages of the invention can be seen, without limiting the scope of protection, in the following, more detailed description of preferred embodiments with reference to the accompanying figures. These show purely exemplary examples:

[0048] Further features and advantages of the invention can be seen, without limiting the scope of protection, in the following, more detailed description of preferred embodiments with reference to the accompanying figures. These show purely exemplary examples: Fig. 1: a schematic side view of an energy chain for long travel distances, with a sliding or rolling upper run as known from the prior art; Fig. 2A-2B: Perspective views of a tab according to the invention, with a one-piece tab body made of plastic, for manufacturing a chain link for an energy chain; Fig. 3A-3E: Perspective views of a section of an energy supply chain according to the invention with two link strands consisting of identical links ( Fig. 3E) as well as enlarged partial views of a rear grip from the outside, shown in extension ( Fig. 3A) and fully angled position ( Fig. 3C), as well as an inside back grip, shown in stretched position ( Fig. 3B) and fully angled position ( Fig. 3D); Fig. 4A-4B: a cross-section ( Fig. 4A) through a tab to Fig. 2-3 corresponding to the mean elevation level (AA, in Fig. 4B) and a side view of a tab strand in stretched position ( Fig. 4B); and Fig. 5: a perspective view of the tab according to the invention (analogous to Fig. 2B) with several longitudinal sections (NN; PP; RR) through the tab at different heights of the tab to illustrate the structure of the tab body, in particular a first rigid retaining projection and a second elastically deformable retaining projection to form a snap connection.

[0049] Fig. Figure 1 shows an energy supply chain 1 for guiding supply lines (not shown), with a plurality of chain links 10 articulated together in the longitudinal direction L, here in a design known per se. The chain links 10 are pivotable relative to each other, each about a pivot axis perpendicular to the plane of travel (plane of the Fig. 1) Thus, the energy supply chain 1 can be moved back and forth, variably forming a loop that includes an upper run 3, a lower run 2, and a connecting deflection arc or deflection section 4. In the example from Fig. 1. The chain links 10 of the upper run 3 slide on the opposite lower run 2 with the narrow sides of the tabs facing the inside of the loop. For this purpose, the inner narrow sides of the tabs form a running surface F that is as continuous as possible (cf. e.g. Fig. 3E below), by means of which the chain links 10 slide against each other in a section of the travel path, or, if rollers are provided on some chain links, roll along. In addition, the chain links 10 of the upper run 3 can slide or roll along a separate support surface 6, e.g., a guide rail or a sliding plate on a guide channel. Fig. Figure 1 schematically shows a fixed point 5 as a stationary connection point and a driver 7 as a movable connection point and a side wall of a guide channel 8 for the lateral guidance of the movable section, here the upper section 3. The invention relates primarily, but not exclusively, to a sliding energy chain 1 for long travel distances, whereby a long travel distance is understood to mean in particular a travel distance with a length ≥50m.

[0050] For long travel distances, a long energy supply chain 1 with a correspondingly high number of chain links is required. With a central power supply or a centrally located fixed point 5 in the travel distance, the total length of the chain is at least half the length of the travel distance, e.g., at least 25 m.

[0051] An energy supply chain 1 according to the invention is now described using the Fig. 2-5 described in more detail. How Fig. Figure 3E shows that the chain consists of a number of chain links 10, each comprising two opposing plates 102. A fully continuous construction is shown here, in which two plates 102 (also called side plates or side parts) are connected to each other parallel and firmly to form a chain link 10 on all chain links 10 via two crossbars 11. Half-link chains or chains with only one crossbar (not shown) per chain link are also within the scope of the invention. As shown in Fig. 3E, regardless of their number, the crossbars hold two laterally spaced tab strands made of tabs 102 parallel to each other, so that a receiving space for the conductors to be guided (not shown) is formed between them.

[0052] How Fig. Figures 2A-2B show that each tab 102 has a one-piece tab body 101, which is made of plastic using injection molding. Fig. Figures 2A-2B further show that the tabs 102 are preferably designed as cranked tabs, i.e., with a first overlap section 102A pointing away from the receiving space of the chain links 10 at one end and a second overlap section 102B facing the receiving space at the other end of the tab body 101. The first overlap section 102A is laterally offset relative to the second overlap section 102B, e.g., when viewing the tab 102 from above. The overlap sections 102A and 102B are integrally connected to each other by a central section 102C located longitudinally L.

[0053] Each tab 102 consists of a one-piece tab body 101 with a side view that is elongated on the main sides, the ends of which form arc-shaped end faces with the overlap sections 102A, 102B and which has two narrow sides running essentially in the longitudinal direction L between them, an inner narrow side 103 in the loop or deflection arc 4 and an outer narrow side 105. Fig. 2A shows the outside (outer main side) of tab 102, Fig. 2B the inside (inner main side), which faces the receiving space in chain link 10, of the same tab rotated 180° around its height center (or a vertical axis).

[0054] The overlap sections 102A, 102B are designed to interact and be conjugate or corresponding to each other, such that two longitudinally L-connected tabs 102 are each connected to the corresponding overlap sections 102A, 102B in an overlapping manner and are pivotable relative to each other about a pivot axis A. The pivot axis A is defined by a pivot pin on one overlap section 102B and a corresponding pivot receptacle on the other overlap section 102A, which interact as a pivot joint, allowing the chain links 10 to be angulated relative to each other in the plane of travel. The angle is limited in a manner known per se, e.g., by interacting stop pockets and stop projections in the overlap sections 102A, 102B. The pronounced longitudinal dimension of the central section 102C is, for example,approximately 33% of the identical longitudinal dimension of the overlap sections 102A, 102B measured in the longitudinal median plane or at the level of the neutral fiber (cf. . Fig. 5 level NN) through the pivot axes A of successive links. This allows for a relatively large chain pitch T ( Fig. 4) are achieved, which corresponds to the distance between the pivot axes A in the longitudinal direction L. With a constant chain pitch T and a constant outer height H of the links 102, the links 102 can preferably be designed such that the quotient of outer height to chain pitch Q=H / T is less than or equal to H / T≤0.9 or H / T ≤ 90%, preferably H / T ≤ 0.8 or H / T ≤ 80%. A large chain pitch T ( Fig. 4) reduces the total number of tabs 102, chain links 10 and crossbars 11 required per unit length of the energy chain 1 and thus also the assembly effort for its manufacture.

[0055] Fig. Figure 2B further shows two fastening pins 11A, 11B on the inside of the tab near the narrow sides for positive and force-fit fastening of crossbars to the tab 102 in a known design, e.g. by means of a snap connection. The fastening pins 11A, 11B are also manufactured integrally with the tab body 101 from plastic.

[0056] Fig. 3E, in turn, also demonstrates another independent aspect for reducing the number of components. The articulated links 102, connected longitudinally L, each form a left link strand and a right link strand in the chain's longitudinal direction. How Fig. As shown in Figure 3E, the same cranked tabs 102 are connected to each other in the longitudinal direction L in both tab strands, but in a laterally reversed configuration. The tabs 102 in one tab strand are therefore structurally identical to the tabs 102 in the other tab strand and not, as is usual in the prior art, designed with a mirror-image geometry. Thus, in a chain link 10, opposing tabs are structurally identical but rotated 180° relative to each other about the vertical axis of the tab, i.e., laterally reversed. In other words, in a selected chain link 10, at each longitudinal end of the first overlap section 102A, which faces the receiving space with its functional elements, there is a second overlap section 102B laterally opposite, which faces away from the receiving space with its functional elements, in contrast to a mirrored design of the tab strands.Thus, apart from the end connection elements at connection points 5 and 7, the energy supply chain 1 can advantageously be constructed entirely from identical links 102 of the same design. This also avoids a difference in length between the two link strands, which is particularly advantageous for long travel distances.

[0057] The enlarged or detailed views in Fig. 3A-3D in conjunction with Fig. Figure 5 illustrates a further independent aspect of the invention concerning the lateral stabilization of the tab strands while simultaneously enabling the simplest possible connection of the tabs 102 to form a single strand. Each tab 102 has a first guide area 121 at its end on the second overlap section 102B. The first guide area 121 extends parallel to the pivot plane around the pivot axis A and is largely arc-shaped. Similarly, each tab 102 has a second guide area 122 at its end on the first overlap section 102A. The second guide area 122 extends parallel to the pivot plane around the pivot axis A and is largely arc-shaped.

[0058] Furthermore, each tab 102 on the central section 102C has a first retaining projection 131, which projects slightly in the longitudinal direction L into the first overlap section 102A, and a second retaining projection 132, which projects slightly in the longitudinal direction L into the other, second overlap section 102B.

[0059] For lateral stabilization of two linked tabs 102, as in Fig. As best seen in Figures 3A-3D, when assembled, one tab 102 engages with its first guide area 121 behind the first retaining projection 131 of the other tab 120, and conversely, the other tab 102 engages with its second guide area 122 behind the second retaining projection 132 of the first tab 120. This interlocking of the linked tabs 102 thus creates a stable connection between the chain links 10 and between each tab strand as a whole, resistant to lateral transverse forces.

[0060] Despite the intended flexibility of the deformable locking tongue, the second retaining projections 132 for snap connection with the corresponding second guide area 122 also achieve a surprisingly high lateral stability (in the direction of the pivot axes A) in the articulated connection of the tabs, in particular against tilting, bending or breaking out of connected tabs from the pivot plane.

[0061] The reverse engagement or the laterally stabilized interlocking of the tabs 102 takes place over the entire desired swivel angle, as from the end positions in Fig. 3A-3B (stretched) or Fig. 3C-3D (fully angled in deflection arc 4) is recognizable. Thus, the first and second retaining projections 131, 132 and the corresponding guide areas 121, 122 are designed such that the guide area 121, 122 engages behind the corresponding retaining projection 131, 132 essentially over the entire pivot angle about the pivot axis A, with minimal lateral play in a corresponding clearance 123, 125.

[0062] The first retaining projection 131 and the second retaining projection 132 are manufactured from the same material as the tab body 101. However, in each tab 102, the first retaining projection 131 differs from the second retaining projection 132 in its design and function. The first retaining projection 131 is designed to be rigid, in the form of a circular disk segment, and is formed as a single, immovable component with the overlapping section. Only the second retaining projection 132, on the other hand, is adjustable, particularly in the longitudinal direction, and is designed to snap into the second guide area 122. For this purpose, the second retaining projection 132 is formed on an elastically deformable detent tongue 133. In the example shown, the rigid first retaining projection 131 is preferably located on the outside of the tab 102 and the second adjustable retaining projection 132 on the inside of the tab 102; however, this can also be reversed.

[0063] As a comparison of Fig. 3B or Fig. 3D with Fig. As can be seen from Figure 5, the locking tongue 133 – viewed in the pivot plane – has a substantially arc-shaped curve around the pivot axis A of the associated overlap section 102A. The second retaining projection 132, on the other hand, forms a locking lug, preferably straight in the vertical direction, at the free end of the curved locking tongue 133. The locking tongue 133 and the second retaining projection 132 are integrally connected to the tab body 101 on their three other sides, and in particular, the retaining projection 132, or the locking lug, is integrally connected to the tab body 101 on both sides in the vertical direction. This enables a locking action that is difficult or nearly impossible to disengage during operation. Fig. Figure 5 illustrates that the locking tongue 133, viewed in longitudinal section of the tab 102, has a geometry that tapers towards the second retaining projection 132, e.g., a wedge-shaped wall thickness. The locking tongue 133 can be manufactured without an undercut in an injection mold without a slide if it is designed as one leg of a U-shaped cantilever design viewed in longitudinal section of the tab (see, e.g., section plane NN in Figure 5). Fig. 5) is executed. This can be achieved by two mutually opening recesses 135, 137 in the tab body 101, wherein at least one recess 137 lies in the edge of the overlap section 102B and is preferably designed in a circular arc shape around the pivot axis A of the associated overlap section 102B, as Fig. 5 or Fig. 3B and Fig. Show in 3D.

[0064] For pronounced stabilization, it is advantageous if the second retaining projection 132 has an effective height dimension hc which is at least 25%, preferably at least 33%, of the outer height H of the tab 102, as shown in Fig. 5 visible.

[0065] Fig. Figures 3A-3E further illustrate that the first retaining projection 131 is arranged off-center between the two narrow sides 103, 105, i.e., asymmetrically with respect to a longitudinal center plane of the tabs, here preferably offset against the direction of pivoting about the pivot axis A or towards the outer narrow side 105. The second retaining projection 132, on the other hand, is arranged centrally between the narrow sides 103, 105, and as Fig. Figure 5 preferably shows a symmetrical design with respect to a tab longitudinal median plane.

[0066] Fig. Figure 5 further shows that the circular arc-shaped first guide area 121 is stepped relative to the overlap section 102A, and that the circular arc-shaped second guide area 122 is also stepped relative to the overlap section 102B. This allows, among other things, free spaces 123, 125 ( Fig. 2A-2B) with a small width dimension, i.e., that the retaining projections 131, 132 can be flush with the outside or inside of the tab 102 to avoid interfering edges. The first guide area 121 and the second guide area 122 preferably each merge seamlessly into a circumferential radial outer reinforcing ring 127A, 127B of the respective overlap section 102A, 102B.

[0067] Furthermore, in Fig. Figures 3A-3D clearly show that the rigid retaining projection 131 has limited dimensions in the circumferential direction around the pivot axis A. The dimensions are chosen such that the corresponding guide area 121 is only overlapped by the first retaining projection 131 over a portion of its arc length or angular amplitude, while the remaining portion is not overlapped by the retaining projection 131. This further simplifies the linking of the tabs 102 during assembly. The same may, but does not necessarily, apply to the second, spring-loaded retaining projection 132, which may, if necessary, overlap the guide area 121 over a larger portion of its arc length.

[0068] With reference to Fig. 2A-2B and Fig. Sections 4A-4B below explain a further independent aspect of the invention, which leads to favorable sliding properties during long travel distances while simultaneously reducing the amount of material used for the individual tab. How Fig. 4B illustrates that the inner narrow sides 103 of the tabs 102 form, in the extended configuration of the trunks, e.g. the lower trunk 2, each a longitudinally extended and running surface F on which the respective opposite trunk can slide or roll if rollers are provided (not shown).

[0069] To improve the running surface F, in particular to achieve a wider running surface F, the tabs 102 each have a widening strip 107 on their inner narrow sides 103. The widening strip 107 extends in the longitudinal direction L and is manufactured in one piece with the tab body 101.

[0070] As from Fig. As can be seen in Figure 4A, the widening strip 107 projects laterally from an inner height area M located between the narrow sides 103, 105, in particular from the central section 102C, of ​​the tab body 101. The outer surface of the widening strip 107 is an integral part of the running surface F for the opposite section, cf. e.g. Fig. 3E or Fig. 4B.

[0071] The inner height area M of the tab body 101, located between the narrow sides 103, 105, has, at least in the central section 102C, a reduced width dimension B, so that the running surface F including the widening strip has a minimum width bf which is at least 1.2 times the reduced width dimension B, cf. Fig. 4A.

[0072] Furthermore, a design with a widening strip 107 allows the horizontal inner height region M of the tab body 101 to have at least one material-saving section with reduced wall thickness in the width direction, such that the minimum width bf of the running surface F is at least twice, preferably at least 2.5 times, the reduced wall thickness. In other words, it is proposed to manufacture the inner height region M of the tab body 101, at least in the central section 102C, with significant material savings compared to the narrow sides 103, 105, and at least compared to the inner narrow side 103, as described above. Fig. Figure 4A illustrates this. Minimizing wall thicknesses not only reduces material costs but also significantly shortens cycle times in injection molding production.

[0073] The preferred design of a tab 102 has an inner widening strip 107 on the inner narrow side 103, which forms an outer surface that runs at least substantially or exactly parallel to a plane spanned by the longitudinal direction L and a pivot axis A, and furthermore a similarly designed outer widening strip 109 on the outer narrow side, an outer surface running in the longitudinal direction L but curved radially outwards (cf. Fig. 4B) forms to reduce the polygon effect in deflection arc 104.

[0074] The two widening strips 107, 109 project outwards only laterally, while the lugs 102 form a smooth, largely edgeless surface facing the interior of the chain link. The two widening strips 107, 109 extend longitudinally (L) over a length of at least, preferably more than, 66% of the total length of the lug in the longitudinal direction L and / or preferably over a length of at least 80% of the chain pitch T, so that a running surface F that is as continuous as possible is formed, while also providing a favorable stiffening effect in the cross-section of the lug 102 (cf. Fig. 4A).

[0075] The asymmetrical arrangement of the first retaining projection 131 against the direction of pivoting into the deflection arc avoids a collision of the two widening strips 107 of two successive tabs, as Fig. 3C illustrates this. The combination of both widening strips 107, 109 with the lateral rear grip as described above enables a mechanically particularly stable and torsionally rigid construction of the tab strands and chain links 10.

[0076] Preferably, each tab should be like Fig. Figures 2-5 show that the body is designed as a tab with an overall undercut-free, easily demoldable geometry, so that cost-effective tools with short cycle times enable inexpensive production. Reference symbol list 1 Energy supply chain 2nd lower trum 3 Obertrum 4 Deflection area 5 Fixed point (stationary connection point) 6. Slide rail (support for upper run) 7 Drivers (movable connection point) 8 guide channel 10 chain links 11 Crossbar 100 chain links 101 tab bodies 102 tab 102A first overlap section 102B second overlap section 102C Midrange 103 inner narrow side 105 outer narrow side 107 Extension strip 109 Extension strip 121 first management area 122 second management area 123, 125 Free space 127A, 127B Reinforcing ring 131 first holding advantage 132 second holding lead 133 Resting tongue 135, 137 depressions A swivel axis B Width dimension bf minimum width Bm reduced wall thickness F Tread surface H Exterior height hc Height dimension H / T ratio (outer height to chain pitch) L Longitudinal direction M inner height range T chain pitch QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] WO 95 / 04231 A1

[0003] WO 2020 / 152349 A1 [0004, 0009] DE 3531066C2

[0005] US 4,813,224 A

[0005] EP 0 803 032 B1 [0008, 0009] US 5,980,409 A

[0008]

Claims

[1] Energy chain (1) for guiding lines, such as cables, hoses, or the like, between two connection points, with a number of chain links (10) each comprising two opposing tabs (102), wherein in at least some chain links the tabs (102) are connected to each other via at least one crossbar (11), wherein each tab has a tab body (101), in particular a one-piece tab body made of plastic, with two overlapping sections and an intermediate central section, wherein two tabs connected in a longitudinal direction (L) of the energy chain (1) each overlap with corresponding overlapping sections and are pivotably connected to each other about a pivot axis (A), and the energy chain (1) is movable in such a way that it forms a loop consisting of a lower run (2), an upper run (3) and a deflection area (4) connecting them, wherein each tab (102) has a first retaining projection (131) and a second retaining projection (132) on its central section, and each tab (102) has at its end on one overlap section a first guide area (121) extending parallel to the pivoting plane and at its end on the other overlap section a second guide area (122) extending parallel to the pivoting plane, wherein, for lateral stabilization of each pair of longitudinally connected tabs (L), one tab (102) engages with its first guide area (121) behind the first retaining projection (131) of the other tab (120), and the other tab (102) engages with its second guide area (122) behind the second retaining projection (132) of one tab (120), characterized by, that the second retaining projection (132) is designed for snap connection with the second guide area (122) and is formed on an elastically deformable locking tongue (133). [2] Energy supply chain (1) according to claim 1, characterized by , that in each tab the first retaining projection (131) is rigidly designed, in particular is formed immovably with the overlap section as intended, and only the second retaining projection (132) is designed for snap connection with the second guide area (122) and is formed on an elastically deformable locking tongue (133). [3] Energy supply chain (1) according to claim 1 or 2, characterized by , that, viewed in the pivot plane, the locking tongue (133) has a substantially arc-shaped curved profile around the pivot axis (A) of the associated overlap section and preferably includes a locking lug that is straight in the vertical direction, which forms the second retaining projection (132). [4] Energy supply chain (1) according to claim 1, 2 or 3, in particular according to claim 3, characterized by , that the locking tongue (133) terminates freely at a locking lug which forms the second retaining projection (132) and is integrally connected to the tab body on its three other sides, wherein preferably the retaining projection (132) or the locking lugs are integrally connected to the tab body on both sides in the vertical direction. [5] Energy supply chain (1) according to any one of the preceding claims, characterized by , that the locking tongue (133) in the longitudinal section of the tab has a geometry that tapers towards the second retaining projection (132). [6] Energy supply chain (1) according to any one of the preceding claims, characterized by, that the locking tongue (133) is designed as a leg of a U-shaped cantilever design viewed in longitudinal section of the tab and is formed by two mutually opening recesses in the tab body, wherein at least one recess is located in the overlap section and is preferably designed in a circular arc shape around the pivot axis (A) of the associated overlap section. [7] Energy supply chain (1) according to any one of the preceding claims, characterized by , that the second retaining projection (132) has an effective height dimension (hc) which is at least 25%, preferably at least 33%, of the outer height (H) of the tab. [8] Energy supply chain (1) according to any one of the preceding claims, characterized by , that in each tab the first retaining projection (131) is rigid and the second retaining projection (132) with its elastically deformable locking tongue (133) is manufactured in one piece, preferably of the same material, with the tab body. [9] Energy supply chain (1) according to any one of the preceding claims, characterized by, that the tabs (102) are designed as cranked tabs with a first overlap section (102A) pointing away from the receiving space of the chain links at one end and a second overlap section (102B) facing the receiving space at the other end, wherein the first overlap section is laterally offset relative to the second overlap section, wherein the first retaining projection (131) projects into the second overlap section and the second retaining projection (132) projects into the first overlap section; and / or that the tabs of the successive number of chain links in the longitudinal direction are articulated together, each with a constant chain pitch (T) and constant outer height (H) of the tab, and that the tabs are designed such that the quotient of outer height to chain pitch (H / T) is less than or equal to 0.9 or ≤ 90%, in particular ≤ 0.8 or ≤ 80%. [10] Energy chain (1) according to one of claims 1 to 9, in particular according to claim 9, wherein the links of the chain links successively connected in the longitudinal direction of the chain form two link strands extending in the longitudinal direction of the chain and spaced apart from each other, comprising a first link strand and a second link strand, characterized by , that in both link strands cranked links (102) are connected to each other in the longitudinal direction (L) of the energy guidance chain, and the links (102) in the second link strand are identical in design to the links (102) in the first link strand and are arranged rotated by 180° around the vertical center axis of the link with respect to the link opposite in the chain link. [11] Energy guidance chain (1) according to one of the preceding claims, wherein an inner narrow side (103) of the tabs is directed towards the inside of the loop and an outer narrow side (105) is directed towards the outside of the loop, wherein the inner narrow sides (103) of the tabs in an extended configuration have a running surface (F) on which the opposite run can slide characterized by , that in each tab - the first retaining projection (131) is arranged off-center between the narrow sides (103), asymmetrically with respect to a tab longitudinal center plane, and preferably offset against the pivot direction about the pivot axis (A) or towards the outer narrow side (105), and / or - the second retaining projection (132) is arranged centrally between the narrow sides (103), preferably symmetrically with respect to a tab longitudinal center plane. [12] Energy supply chain (1) according to any one of the preceding claims, characterized by, that the arc-shaped first guide area (121) is stepped at the overlap section and / or the arc-shaped second guide area (122) is stepped at the overlap section, wherein the first guide area (121) and the second guide area (122) are preferably each integrally connected with a circumferential radial outer reinforcing ring of the respective overlap section. [13] Energy supply chain (1) according to any one of the preceding claims, characterized by , that -the rigid or first retaining projection (131) is dimensioned to a limited extent in the circumferential direction around the pivot axis (A), such that the corresponding guide area is only overlapped by the first retaining projection (131) over a portion of its arc length or angular amplitude, and is not overlapped by the retaining projection (131) over another portion of its arc length or angular amplitude; and / or -the first and second retaining projections (131, 132) and the corresponding guide areas (121, 122) are designed such that the guide area engages essentially over the entire pivot angle about the pivot axis into a free space (123, 125) behind the retaining projection (131, 132). [14] Link for an energy chain (1) for guiding conductors, such as cables, hoses, or the like, between two connection points, with a number of chain links (10), each comprising two opposing links (102), wherein in at least some chain links the links (102) are connected to each other via at least one transverse web (11), wherein the link has a link body (101), in particular a one-piece link body made of plastic, with two overlapping sections and an intermediate central section, wherein the overlapping sections correspond to the overlapping and pivotable connection of two links connected to each other in a longitudinal direction (L) of the energy chain (1) about a pivot axis (A), wherein the tab (102) has a first retaining projection (131) and a second retaining projection (132) at the central section, and the tab (102) has at its end on one overlap section a first guide area (121) extending parallel to the pivoting plane and at its end on the other overlap section a second guide area (122) extending parallel to the pivoting plane, characterized by , that the second retaining projection (132) for snap connection with the second guide area (122) of an identical tab is designed and formed on an elastically deformable locking tongue (133). [15] Tab according to claim 14, characterized by one or more of the tab features of claims 2 to 13.

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