Chain guide device for a rope weight balancing chain, rope weight balancing chain and method for lengthening a rope weight balancing chain

Abstract

The following description relates to a chain guide device (1) for a rope weight compensation chain (2) of an elevator system (3), comprising: a fastening module (4) for fastening the chain guide device (1) in an elevator shaft (5), a guide module (6) for guiding the rope weight compensation chain (2) in an elevator shaft (5), a detection device (7), wherein the guide module (6) has at least one, preferably two, recesses (8) designed to receive and guide a rope weight compensation chain (2), wherein the guide module (6) is connected to the fastening module (4), wherein the guide module (6) is movably mounted relative to the fastening module (4), and wherein the detection device (7) is arranged between the fastening module (4) and the guide module (6). Furthermore, the following descriptions relate to a rope weight compensation chain (2) for a chain guide device (1) of an elevator system (3). Furthermore, the following descriptions relate to a method for extending a rope weight compensation chain (2) for an elevator system (3) with an extendable usable travel path and a chain guide device (1).

Description

Technical field

[0001] The following descriptions concern a chain guide device for a rope weight compensation chain of an elevator system.

[0002] Furthermore, the following statements concern a rope weight compensation chain for a chain guide device of an elevator system.

[0003] Furthermore, the following explanations concern a method for extending a rope weight compensation chain for an elevator system with an extendable usable travel path and a chain guide device. Technical background

[0004] It is known that rope counterweight chains are used in elevator systems, particularly at greater travel heights, to maintain a constant weight ratio between the car and the counterweight throughout the entire travel path. They typically hang freely below the car and / or the counterweight and run over appropriate guides or deflection devices. Their own weight contributes to reducing dynamic load changes in the suspension system. This ensures traction between the suspension ropes and the traction sheaves, improving both the energy efficiency and the smooth operation of the system. Various chain guide devices are known in the prior art that enable guided movement of the rope counterweight chain, but none provide condition monitoring for trouble-free chain operation.

[0005] Furthermore, so-called "expandable" elevator systems or comparable modular systems present a specific technical challenge: In such systems, the usable travel distance is extended during operation, as is the case, for example, with buildings constructed in stages or very tall buildings. In this context, it is necessary to extend the rope counterweight chain accordingly. Until now, this process has been carried out in practice with increased manual effort and without integrated monitoring of the mechanical changes in the rope counterweight chain's condition.

[0006] WO 2023 / 160817 A1 discloses an elevator with an extendable usable travel distance for a building under construction. The extension of the usable travel distance is achieved by an elevator lifting device for adjusting the elevator height. Such elevators are also referred to as extendable elevator systems. It is disclosed that extending the travel distance necessitates the lengthening of other components, such as the compensating chain. The installation of longer compensating chains to replace the original chain, as well as the installation of compensating chain sections to extend the original chain, is disclosed. EP 1 154 947 B1 also discloses an extendable elevator system with a compensating chain.

[0007] There is a need to simplify, as well as to make safer and more fault-tolerant, the described changes in condition when extending the usable travel distance of such an elevator. Based on this situation, the present task is to propose a chain guide device for a rope counterweight chain of an elevator system that not only enables reliable guidance of the chain in the elevator shaft, but also allows for condition monitoring of the rope counterweight chain.

[0008] Another object of the invention is to provide a rope weight balancing chain that can be easily extended and operated in conjunction with the chain guide device, particularly in elevator systems with extendable usable travel distance, such as those used in growing elevator systems.

[0009] A further object of the invention is to provide a method for lengthening a rope counterweight chain for an elevator system with an extendable usable travel distance, whereby the lengthening process is made safer and more fault-tolerant. Description - Technical Solution

[0010] The present problem is solved by the features of the independent claims. Advantageous embodiments are specified in the dependent claims, the description, and the drawings. Where technically feasible, the teachings of the dependent claims can be combined arbitrarily with those of the main and dependent claims.

[0011] In particular, the problem is solved by a chain guide device for a rope weight compensation chain of an elevator system, comprising a mounting module for fastening the chain guide device in an elevator shaft, a guide module for guiding the rope weight compensation chain in an elevator shaft, and a detection device, wherein the guide module has at least one, preferably two, recesses designed to receive and guide a rope weight compensation chain, wherein the guide module is connected to the mounting module, wherein the guide module is movably mounted relative to the mounting module, wherein the detection device is arranged between the mounting module and the guide module, and wherein the detection device is designed to detect a relative movement between the mounting module and the guide module.

[0012] The following sections explain advantageous aspects and subsequently describe preferred modified embodiments. Explanations, particularly regarding advantages and definitions of features, are essentially descriptive and preferred, but not limiting, examples. If an explanation is limiting, this will be explicitly stated.

[0013] For the purposes of this disclosure, a chain guide is understood to be, in particular, a mechanical device that serves to guide, support, or tension a chain along a predetermined path. It ensures that the chain remains in its defined position, does not pivot laterally, does not become entangled in system components, and runs smoothly over guide or drive elements. This guidance reduces friction, wear, and noise while simultaneously increasing operational reliability. Chain guides often consist of a combination of fixed or flexibly mounted guide rails, rollers, or sliding elements made of wear-resistant material. Depending on the application, the chain guide can be rigid or spring-loaded to compensate for length tolerances of the chain and dynamic loads.

[0014] For the purposes of this disclosure, a chain is understood to be, in particular, a flexible, longitudinally load-bearing machine element consisting of a multitude of links connected by joints. It typically serves for power transmission, motion initiation, and the transport of loads, but can also be used as ballast due to its own weight. Examples include anchor chains on ships or counterweight chains used for moving loads. Depending on the application, various types of chains are distinguished, such as roller chains, toothed chains, link chains, hollow pin chains, or round steel chains, with each design fulfilling specific requirements regarding tensile strength, smooth running, wear resistance, and maintenance needs. Due to their articulated structure, chains can be deflected over wheels or guides and enable smooth movement even over long distances.

[0015] For the purposes of this disclosure, a rope weight compensation chain is understood to be, in particular, a special ballast chain used in elevator systems to compensate for weight and force between the upward and downward movement of the load-bearing elements—especially the elevator ropes. It is primarily used for medium to large travel heights where the ropes' own mass, due to their length, would otherwise cause a significantly asymmetrical load distribution within the system. The rope compensation chain is typically U-shaped or suspended between the elevator car and the counterweight or the shaft floor, where it functions as a flexible connecting and compensating element. It is designed to compensate for changes in the length of the hanging rope strands during operation, thereby ensuring an even load distribution across the drive unit and the suspension.Rope balancing chains are characterized by their high bending and torsional flexibility, which allows them to adapt to movements and changes in direction within the elevator shaft, as well as their robust design, which enables them to reliably absorb dynamic forces.

[0016] For the purposes of this disclosure, a fastening module is understood to be, in particular, a component or assembly that serves to securely and precisely fasten other components or parts within an elevator shaft. The fastening module can be attached directly to the shaft floor or wall, or indirectly to a supporting structure. It typically comprises several mechanical elements such as brackets, clamps, screw connections, or plug connections, and, depending on the application, may also exhibit damping, insulating, or guiding properties. The fastening module enables an easy-to-install, stable, and detachable connection that can be adapted to various geometries, loads, or installation situations, thus contributing to the structural flexibility and ease of maintenance of a technical system.

[0017] For the purposes of this disclosure, a guide module is understood to be, in particular, a component or assembly that serves to selectively direct, stabilize, guide, or limit the movement and / or position of a component, such as a round steel link chain, within a technical system. It typically performs guiding and / or bearing functions and ensures that a guided element follows a defined path, direction, orientation, and / or a specific movement pattern. Depending on the application, guide modules incorporate sliding elements, rolling elements, bearing elements, guide rails, guide profiles, rollers, sliding inserts, or corresponding bearing blocks and are often designed for precise, repeatable movements with minimal play and low wear. They typically contribute to operational reliability, positioning accuracy, and smooth running.

[0018] For the purposes of this disclosure, a detection device is understood to be, in particular, a technical device that serves to detect, record, and convert certain physical or mechanical states, changes, movements, or objects into an evaluable signal. It typically operates with sensors or sensor devices that react to defined stimuli—such as movement, light, pressure, electric or magnetic fields, or the actuation of switches—and convert these into electrical signals. In particular, the detection device can be designed to detect relative movements between two components, modules, or devices and convert these into corresponding electrical signals.

[0019] For the purposes of this disclosure, a recess is understood to be, in particular, a deliberately designed, usually geometrically defined opening or free space within a component or surface, which is introduced for functional, structural, or assembly-related reasons. It can, for example, serve to reduce weight, accommodate other components, or allow the passage of cables, chains, or connecting elements.

[0020] In the context of this disclosure, relative motion is understood to mean, in particular, the movement of a body, part, module, or component in relation to another body, part, module, component, or reference system. It therefore does not describe absolute motion in space, but rather the change in the position, location, or orientation of a first object relative to a second object that serves as a reference point. In technical applications, the term relative motion typically refers to a controlled displacement, rotation, or transfer between two functionally interacting components. Relative motions can be translational, rotational, or curved and arise, for example, from the application of force, elastic deformation, or external influences.The detection of such movements is often essential for condition monitoring, operational safety or maintaining the functionality of systems, for example to trigger an emergency stop in the event of a detected relative movement between two components.

[0021] One solution to the problem, using the aforementioned chain guide device for a rope counterweight chain of an elevator system, comprises the teaching that a rope counterweight chain can be reliably guided and its operating status simultaneously monitored. For this purpose, the device includes a mounting module with which it can be firmly anchored in the elevator shaft, and a guide module specifically designed to receive and stably guide the rope counterweight chain. The guide module has at least one, preferably two, recesses designed to hold the rope counterweight chain in position and guide it securely in the shaft. The guide module is movably mounted relative to the mounting module so that it can react to movements of the rope counterweight chain or to mechanical changes in the system.A detection device is positioned between the mounting module and the guide module. This device is designed to detect relative movements between these two modules. Such relative movements can be caused, for example, by vibrations, misalignment, or collisions of the rope counterweight chain with other components of the elevator system within the elevator shaft. The detection device thus serves as a central element of condition monitoring by detecting any deviations from the target state and providing a corresponding signal for further analysis. Therefore, the device not only ensures safe and controlled movement of the rope counterweight chain within the shaft but also provides a technical basis for continuous or event-based monitoring of the chain's condition, a capability not previously available in the prior art.In this way, the operational reliability is significantly increased, especially in elevator systems with extendable travel distances, and the basis for a fault-tolerant extension process of the rope weight compensation chain is created.

[0022] By positioning a detection device between the mounting module and the guide module, which is mounted to move relative to it, continuous monitoring of the mechanical condition of the chain guide device, and thus indirectly also of the rope counterweight chain, is enabled. This allows for the early detection of relative movements that can occur, for example, as a result of chain jamming, uneven loading, wear, or faulty installation. In this way, potential malfunctions or safety-relevant conditions can be reliably detected, leading to a significant increase in the operational safety of the elevator system. At the same time, the mechanical decoupling of the mounting and guide functions is enabled, so that dynamic movements of the rope counterweight chain can be absorbed without compromising the overall strength of the assembly.This not only improves the system's smooth operation but also reduces wear on the rope counterweight chain and adjacent components. A further advantage arises in elevator systems with extendable travel, such as expanding elevators where the rope counterweight chain needs to be lengthened: The detection device allows for reliable monitoring and support of this process, thus helping to prevent errors during installation or maintenance. Furthermore, the detection device enables electronic analysis and, for example, the generation of an output signal that can be integrated into a control logic. This lays the foundation for condition-based maintenance, which is increasingly required in modern, digitally networked elevator systems.Furthermore, the modular design of the chain guide device allows for easy adaptation to different installation situations and promotes retrofitting in existing systems.

[0023] Alternatively or additionally, the chain guide device may be provided with a return element, wherein the return element serves to return the guide module to an operating position, wherein the return element is in particular a mechanical return element and has a return spring.

[0024] For the purposes of this disclosure, a return element is understood to be, in particular, a component or part that returns a third component or part to a defined initial or rest position after a movement or intervention. The return can be achieved in various ways, for example, mechanically by springs, elastic elements, or gravity, but also by electrical, pneumatic, or hydraulic drives. Passive systems, such as spring-actuated systems, are particularly preferred. The return element ensures that the respective device returns to its initial position automatically or in a controlled manner after an actuation, a relative movement, or a change in function, thereby guaranteeing reliable reusability or reactivation of the function.

[0025] For the purposes of this disclosure, an operating state of the chain guide device is understood to be a functional state that exists when the device can be used as intended. This includes, in particular, states in which the rope weight compensation chain is properly guided and no relative movements have occurred that could trigger the detection device. Specifically, the operating state is therefore not present during maintenance or in a fault condition of the rope weight compensation chain.

[0026] The reset element offers the advantage that, after a relative movement, intervention, or change in function, the chain guide device is automatically or selectively returned to a defined initial state. This ensures that the guidance of the rope weight compensation chain remains permanently stable and that the detection device can operate reliably. Particularly in the case of short-term disturbances or dynamic movements, the reset element increases operational reliability, reduces the risk of malfunction, and facilitates the restoration of a standard-compliant operating state, potentially even without manual intervention. Specifically, the reset element allows the reset force to be precisely adjusted and thus adapted to the respective elevator system and application.

[0027] Alternatively or additionally, the guide module may have at least one rotatable guide element for guiding the rope weight compensation chain, preferably several conveyor rollers, particularly preferably four conveyor rollers, and wherein the rotatable guide elements are arranged in the recesses of the guide module.

[0028] For the purposes of this disclosure, a guide element is understood to be a component or functional element that serves to direct, limit, or stabilize the movement of another component in a desired direction. It ensures that the guided element follows a defined path or a predetermined movement pattern, thereby preventing unwanted deflections, tilting, or twisting. Guide elements perform tasks for precise, repeatable, and low-friction movement. Depending on the system, guide elements can be designed as sliding bearings, rollers, cylinders, rails, guide grooves, bolts, or profile bodies and are usually made of wear-resistant material. In chain guide technology, particularly with counterweight chains, guide elements serve to hold the chain in its position and ensure defined movement through the elevator shaft.

[0029] The use of such rotatable guide elements significantly reduces the running resistance of the rope counterweight chain as it moves through the shaft, resulting in smoother, more consistent, and less-wearing operation. This is particularly advantageous during vertical car movements, as the chain is constantly being adjusted, and friction between the chain and guide module plays a crucial role in energy consumption and material stress. The arrangement of the rotatable guide elements within the recesses of the guide module allows for a positive-locking yet flexible mounting of the chain, thus stabilizing it laterally and supporting it in its direction of movement. The preferred use of multiple, especially four, conveyor rollers enables multi-point, two-sided chain support, effectively preventing vibrations, tilting, and twisting.This not only improves the smoothness and operational reliability of the entire elevator system, but also extends the service life of the rope counterweight chain and reduces maintenance requirements. Furthermore, the modular design with integrated rollers allows for easy retrofitting or adaptation to different chain types or shaft geometries.

[0030] Alternatively or additionally, the guide module may have at least one first damping element for damping operating noise and / or for damping chain movements in the horizontal direction, preferably several rubber rollers, in particular four rubber rollers, and wherein the first damping element is arranged in one of the recesses of the guide module.

[0031] For the purposes of this disclosure, a damping element is understood to be a technical component designed to selectively absorb, reduce, or limit mechanical oscillations, shocks, vibrations, or kinetic energy. It counteracts sudden or unwanted transmission of movement or force through elastic, viscous, or combined material properties, thus contributing to stabilization, noise reduction, and the protection of adjacent components. Damping elements are often made of elastomeric materials such as rubber or polyurethane, but can also include spring-damper systems, friction elements, or fluid-based solutions. They can improve comfort, increase the service life of mechanical components, and contribute to operational safety. In a chain guide device, damping elements serve, in particular, to smooth the movements of the rope counterweight chain and reduce operating noise.It is particularly preferred that a plurality of first damping elements be provided, which are arranged symmetrically in the two recesses.

[0032] By equipping the guide module with at least one damping element—preferably several rubber rollers—mechanical vibrations and shock loads acting on the chain during elevator operation are effectively reduced. This leads to a noticeable improvement in smooth running and reduces the transmission of vibrations and structure-borne noise to adjacent building components, which is particularly important in modern buildings with increased acoustic comfort requirements. The horizontal damping also prevents uncontrolled swinging or impact of the chain against the guide components, thereby reducing the mechanical stress on the entire guide system. The preferred use of rubber rollers allows for elastic absorption of movements while simultaneously providing a restoring effect, which, in addition to damping, also facilitates smooth guidance.The multi-point arrangement of several rubber rollers – particularly in a symmetrical four-point bearing – creates a stable guide channel that securely holds the rope weight compensation chain in position and simultaneously reduces the risk of jamming or twisting. Overall, this significantly contributes to noise and vibration damping, operational reliability, and extended service life of the chain guide device.

[0033] Alternatively or additionally, the recesses and / or guide elements and / or damping elements may be designed to guide the cable counterweight chain in a rotationally secure manner. For the purposes of this disclosure, "rotationally secure" is understood to mean a design feature or configuration of a component or assembly that prevents or reliably limits unintentional rotation about a specific axis. A rotationally secure design ensures that the element in question—for example, a chain, a connector, or a guide element—is held in a defined orientation during operation and cannot rotate relative to its longitudinal or installation direction. Rotational security is particularly crucial when uniform force application, a defined force flow, or the positional accuracy of moving components must be ensured.In a cable counterweight chain, a twist-proof guide means that the chain runs through the shaft in a torsionally stable manner, does not rotate around its own axis, and therefore remains reliably in the designated guide elements. This increases operational reliability, reduces wear, and prevents malfunctions caused by mechanical jamming or misalignment.

[0034] This torsion-resistant design reliably prevents the chain from twisting around its own longitudinal axis during operation, which could otherwise lead to malfunctions, increased wear, uneven loading, or even damage to the chain guide. The defined and stable positioning reduces the risk of mechanical misalignments or uncontrolled movements within the shaft and simultaneously ensures precise force transmission to the guide elements. This not only contributes to the smooth operation and reliability of the elevator system but also increases the service life of the rope counterweight chain and its associated guide components. Furthermore, the torsion-resistant guide improves the conditions for the detection device to accurately detect changes in condition, as relative movements are more clearly interpretable when the chain maintains its defined orientation.

[0035] Alternatively or additionally, the detection device may include at least one sensor device, wherein the sensor device in particular includes one or more displacement sensors, force sensors, and / or switching sensors. For the purposes of this disclosure, a sensor device is understood to be a technical unit comprising one or more sensors and serving to detect physical or mechanical quantities, such as displacement, force, pressure, or motion, and to convert them into an evaluable electrical, optical, or digital signal. The sensor device thus forms the interface between a real physical process and an electronic or information technology evaluation.It can consist of a single sensor element or a combination of several sensors and is often integrated into a housing or carrier unit that also includes mechanical protection, power supply interfaces, and signal processing units. The sensor device enables the monitoring of operating conditions, the control of processes, and the detection of deviations or malfunctions. In a chain guide device for a rope counterweight chain, the sensor device serves in particular to detect relative movements between components and to draw conclusions about the mechanical condition or a possible malfunction of the chain.

[0036] The sensor-based design enables precise and reproducible condition monitoring of the cable counterweight chain, allowing for the early detection of mechanical changes, misalignments, or malfunctions. The use of different sensor types allows for application-specific configurations: displacement sensors enable the continuous detection of position changes, force sensors provide information about occurring mechanical loads, and switching sensors can generate a switching signal to trigger a safety mechanism or shut down the system when defined limits are exceeded. This versatile configuration option allows the detection device to be adapted to diverse requirements and operating conditions.The integration of such sensors also forms the basis for digital signal processing and connection to higher-level control systems, enabling both automated evaluation and the implementation of condition-based maintenance strategies. Overall, this increases the functional reliability, responsiveness, and flexibility of the chain guide device.

[0037] Alternatively or additionally, it can be provided that the guide module is mounted in a tiltable manner relative to the mounting module, and the detection device is designed to detect a corresponding tilting movement between the mounting module and the guide module.

[0038] For the purposes of this disclosure, the general term "tiltable" refers to the property of a component or assembly to be mounted or connected in such a way that it can be tilted or tilted about a defined axis or within a limited angle. A tiltable design thus allows for a controlled change in the element's position in at least one direction without a complete displacement or rotation. In technical applications, tiltability is frequently used to compensate for relative movements, address mechanical tolerances, provide clearance, or enable targeted motion responses—for example, in guiding flexible components, mounting components with freedom of movement, or triggering sensor functions.In a chain guide device, a tiltable bearing can, for example, ensure that the guide module reacts flexibly to changes in position in the event of uneven chain load or during assembly and extension processes, while the movement can simultaneously be detected via a detection device.

[0039] The tilting capability allows the system to react flexibly to asymmetrical loads, vibrations, or uneven movement of the rope counterweight chain without causing jamming, damage, or uncontrolled deflections. This improves the mechanical decoupling between the chain and the mounting structure, increasing the service life of the components involved and reducing maintenance requirements. Simultaneously, the detection device, specifically designed to capture this tilting movement, enables targeted monitoring of such deviations. This provides a reliable basis for assessing the condition of the chain guide during operation or chain lengthening. Detecting tilting movements allows for early indications of misalignment or uneven force distribution, enabling preventive measures to be taken.The tiltability thus contributes to the functional elasticity, monitoring reliability and increased operational reliability of the chain guide device in dynamic application situations.

[0040] Alternatively or additionally, it may be provided that the guide module and / or the mounting module has at least a second damping element, wherein the second damping element is arranged between the guide module and the mounting module, and is designed to dampen the relative movement between the guide module and the mounting module.

[0041] Such a second damping element is particularly advantageous when vibrations, shocks, or momentary deflections of the cable counterweight chain occur during operation, which would otherwise be transmitted undamped to the connection between the guide and mounting modules. The second damping element absorbs this kinetic energy and reduces both mechanical stress peaks and noise generation within the device. At the same time, it protects the detection device from overload or false triggers, as rapid or small movement impulses do not act unhindered on the sensor system. The additional damping thus not only improves the smoothness of operation and the longevity of the mechanical components but also increases the reliability of the condition monitoring.Overall, such a second damping element contributes to a more robust, fault-tolerant and lower-maintenance design of the chain guide device, especially under dynamic operating conditions.

[0042] Alternatively or additionally, it may be provided that the detection device generates an electronic output signal that enables condition monitoring of the rope weight compensation chain, whereby the output signal can be used in particular as an interlock signal for the operation of the elevator system.

[0043] This creates the transition from purely mechanical monitoring to digital, system-integrated diagnostics. The electronic signal allows for immediate processing in the elevator control system and can be used, for example, to indicate maintenance needs, document operating states, or trigger defined responses. A particularly advantageous feature is the ability to use the output signal as an interlock signal for the elevator's operation. This allows operation to be automatically interrupted or prevented if an impermissible relative movement between the guide module and the mounting module is detected—for example, due to a faulty chain extension, a blockage, or a mechanical defect. This increases operational safety, as malfunctions can not only be detected but also processed directly in a safety-relevant manner.Furthermore, signal generation provides the basis for continuous, digital condition evaluation and the integration of the chain guide device into higher-level maintenance or monitoring concepts, as are increasingly required in modern, networked elevator systems.

[0044] Alternatively or additionally, the detection device may be connected to a control-side evaluation unit of an elevator system. For the purposes of this disclosure, a control-side evaluation unit is understood to be an electronic or software-based component within a control system that serves to acquire and analyze incoming signals, particularly from sensors or detection devices, and to convert them into control-relevant reactions or status information. It forms the interface between the physical detection of a process (e.g., movement, force, position) and the logical reaction of the system by evaluating, comparing, and interpreting the sensor data and, if necessary, comparing it with stored threshold values ​​or conditions.In elevator systems, for example, the control-side evaluation unit processes signals from a detection device in order to trigger safety functions, document operating states, or activate automated shutdowns or interlocks. It is typically integrated into the system's overall control architecture and can also be part of a monitoring or maintenance-based overall concept.

[0045] Such connectivity between the detection device and the elevator system's control unit creates the basis for automatic, system-wide evaluation of the status data captured by the detection device. The connection to the evaluation unit allows detected relative movements to be directly translated into concrete control commands, such as activating a warning message, initiating a safe system stop, or logging status changes for later maintenance decisions. This connection also enables the implementation of more complex evaluation strategies, such as the time-dependent recording of movement patterns or the combination of multiple sensor signals for fault tolerance testing.Furthermore, it opens up the possibility of integrating the condition information into a higher-level building management or maintenance system, allowing the chain guide device to be seamlessly integrated into digital maintenance concepts or predictive maintenance strategies.

[0046] The problem is further solved by a rope weight balancing chain for a chain guide device of an elevator system, comprising: at least a first chain section, comprising a first and second chain end and a second chain section connectable to the first chain section via at least one detachable chain connector, comprising a third and fourth chain end, wherein the first chain end is connectable to a car of an elevator system via a first detachable end connector and wherein the second or fourth chain end is connectable to a counterweight of an elevator system via a second detachable end connector, wherein one of the chain ends has a rotatable and / or pivotable end connector and wherein another chain end has a torsionally rigid and / or pivotally rigid end connector.

[0047] Where ordinal numbers, such as "first," "second," etc., are used, for example to designate a component, an element, a process step, or a process action, these ordinal numbers are solely for differentiation in the designation and do not indicate any dependencies or sequences. This means, in particular, that a device does not need to have a "first component" to have a "second component." A device can also have a "first component" and a "third component" without necessarily having a "second component." Multiple units with the same ordinal number are also possible, for example, multiple "first components."

[0048] For the purposes of this disclosure, an end connector is understood to be, in particular, a mechanical connecting element used to securely and releasably connect the end of a chain, rope, or similar flexible traction element to a fixed component—for example, a car, counterweight, or an attachment point in the elevator shaft. The end connector forms the force-fit and / or form-fit interface between the rope counterweight chain and the structure to which it is attached, and must reliably withstand both static and dynamic loads. It can be rigid, rotatable, or pivotable, depending on whether a movable bearing is required to accommodate relative movements or torsional forces. End connectors are often designed to be releasable and reusable during maintenance work—especially when lengthening or replacing the rope counterweight chain.In modular elevator systems or growing elevator installations, they enable flexible adaptation to changing structural conditions and contribute significantly to a safe and maintenance-friendly connection between the chain and elevator components.

[0049] To solve this problem, a chain is provided that can be adapted to the increasing height of the elevator system in a modular form, without requiring a complete replacement or costly retrofit. The rope counterweight chain consists of at least one first chain section with defined ends and a second chain section that can be connected via at least one detachable chain connector. This modular design allows the existing chain run to be extended by connecting the second section to the first. Furthermore, the remaining free chain ends are equipped with detachable end connectors that allow for flexible connection to the elevator car and the counterweight. A particular advantage is that one end connector is rotatable or pivotable, while the other is torsionally rigid or pivotally rigid, thus enabling both mobility and positional fixation to be implemented as needed.This targeted differentiation of the storage conditions contributes to operational reliability and controlled chain guidance. Overall, the disclosed rope weight compensation chain thus enables a structured, fault-tolerant, and operationally relevant extension that can be implemented quickly and safely both during maintenance and during the construction of a building. This not only reduces the technical effort but also minimizes the risk of malfunctions, especially in combination with the chain guide device and its integrated condition monitoring.

[0050] The modular design of the rope counterweight chain, consisting of at least two chain sections connectable via a detachable chain connector, allows for simple and structured chain extension without requiring complete chain replacement. This not only saves on material and assembly costs but also reduces elevator downtime when the travel distance is subsequently extended, a common requirement for expanding elevator systems. The use of detachable end connectors at the chain ends enables flexible and secure attachment of the chain to the car and counterweight. Designing one end connector to be rotatable or pivotable and another torsionally rigid or pivotally rigid is particularly advantageous, as this allows for controlled freedom of movement in one direction while limiting it in the other.This contributes to controlled movement, the prevention of torsion, and the twist-proof guidance of the chain. The combination of these properties results in a mechanically stable yet adaptable compensating chain that is ideally suited for use with the chain guide device and its detection system.

[0051] The problem is further solved by a method for lengthening a rope counterweight chain for an elevator system with an extendable usable travel distance and a chain guide device, comprising the steps of: transferring the elevator system to a maintenance state, optionally moving the elevator system to a chain extension position, triggering the detection device, releasing a first detachable end connector from the first chain section, connecting the second chain section to the first chain section by means of the first detachable chain connector, connecting the second chain section to the car or the counterweight by means of the released end connector, resetting the detection device, extending the usable travel distance of the elevator system, and transferring the elevator system to an operating state.

[0052] It is preferred that the sequence of process steps can be varied, unless a specific sequence is technically required. However, the aforementioned sequence of process steps is particularly preferred. In particular, the process steps relating to connecting the chain sections to other chain sections and to carriages or counterweights can be interchanged.

[0053] For the purposes of this disclosure, a maintenance state is understood to be, in particular, a defined operating mode of an elevator system in which certain safety-relevant functions can be restricted or specifically modified to allow inspection, repair, or adjustment work to be carried out safely. At the same time, it is ensured that no passengers are in the elevator system. In this state, the system is either completely deactivated or only partially controllable, with safety-critical movements, automatic processes, or operating functions being deactivated or replaced by special protective measures. The maintenance state is generally activated manually or by a control system and may involve additional measures such as disconnecting the system from the power supply, activating interlocks, or enabling certain access points.In elevator systems, the maintenance status typically means that the elevator can be moved manually without being used for regular passenger service, allowing work to be carried out on the rope counterweight chain, guide rails, or control system. The purpose of the maintenance status is to ensure the safety of maintenance personnel, prevent unintentional operation, and enable targeted maintenance measures.

[0054] For the purposes of this disclosure, a chain extension position is understood to be, in particular, a defined position of the elevator unit, i.e., the car and / or the counterweight, within the elevator shaft, in which a safe and accessible replacement or extension of the rope counterweight chain can be carried out. In this position, the relevant chain end is located in the immediate vicinity of an area accessible to maintenance personnel, for example, in the area of ​​the shaft floor or a maintenance opening. The chain extension position serves to carry out mechanical interventions on the chain under safe and ergonomic conditions and is deliberately accessed during maintenance operations.

[0055] Activating the detection device means, in particular, that the device's detection mechanism is deliberately triggered, especially manually by a technician, to bring the elevator system into a safe state. This also prevents any movement of the car and / or counterweight. Even manual operation, which is generally still possible during maintenance, is thereby prevented. The process can be initiated by an operating action, a movement, and / or the application of force, depending on the sensor design. Activating the detection device serves, in particular, to ensure the safe execution of the chain extension process, to identify the process, and / or to document it. The trigger signal can, for example, generate an electronic output signal that is interpreted as an indication of an open connection, a detached chain, or a tampering.The triggering mechanism thus represents an interface between mechanical intervention and electronic condition monitoring, contributing to the traceability and automated monitoring of the chain guide unit.

[0056] To solve the problem, a method for lengthening a rope counterweight chain is provided. The systematic sequence of steps ensures that both the mechanical handling of the chain extension and condition-based monitoring are integrated into the process. Putting the elevator system into a maintenance state forms the basis for safe intervention, preventing any uncontrolled movements. If necessary, the system is then moved into a defined chain extension position, making the affected chain end easily accessible and allowing for ergonomic and safe intervention. Triggering the detection device signals to the system that a fault exists in the chain system, which can then trigger the interlocking of the control functions. This provides an additional level of safety.Subsequently, the first detachable end connector is released, the new chain section is attached via the chain connector, and the end connector is reattached to the elevator structure. This modular connection method allows for an extendable chain structure without a complete replacement. With each subsequent chain extension, either additional chain sections can be added, or previously added short chain sections can be replaced with longer ones. After successful installation, the detection device is reset to document the completion of the process and to return the system to a safe operating state. Finally, the usable travel distance is extended, and the elevator system is returned to regular operating mode.This clearly structured process enables a traceable and technically sound chain extension, minimizing safety risks, detecting changes in condition, and systematically preventing operator errors. The process thus contributes significantly to fulfilling the technical requirements.

[0057] By putting the elevator system into a maintenance state, it is ensured that all subsequent steps can be carried out under safe conditions. The optional procedure for moving the chain into an extension position further ensures that the relevant chain end is ergonomically and safely accessible, thus increasing occupational safety and efficiency. Precisely triggering the detection device before the extension begins ensures that the intervention is recognized by the system and that appropriate measures, such as temporary locking or status indication, can be initiated automatically. The defined sequence of releasing the end connector, connecting the new chain section using a chain connector, and reinserting the end connector guarantees a traceable and fault-tolerant execution of the mechanical connection.Resetting the detection device after successful installation of the new chain section documents the completion of the intervention and allows the elevator control system to be reactivated only when fault-free. The combination of these steps enables controlled lengthening of the rope counterweight chain, which can be easily integrated into existing maintenance procedures while simultaneously providing reliable condition monitoring. Brief description of the drawings

[0058] A preferred technical solution is explained in more detail below with reference to the accompanying drawings and preferred embodiments. The term "figure" is abbreviated as "Fig." in the drawings.

[0059] The drawings show Fig. 1 a perspective view of a first embodiment of a chain guide device in a closed state; Fig. 2 a perspective view of a first embodiment of a chain guide device in an open / released state; Fig. 3 a detailed view of a detection device according to a first embodiment of a chain guide device; Fig. 4 a detailed view of a first end connector according to an embodiment of a rope weight balancing chain; Fig. 5 a detailed view of a second end connector according to an embodiment of a rope weight balancing chain; Fig. 6 a detailed view of a first chain connector according to an embodiment of a rope weight balancing chain; Fig. 7 a perspective view of a first embodiment of a chain guide device in a closed state and with a preferred embodiment of a rope weight balancing chain which is mounted in an elevator system; and Fig. 8 a diagram of a preferred method according to claim 11. Detailed description of the drawings

[0060] The described embodiments are merely examples that can be modified and / or supplemented in various ways within the scope of the claims. Each feature described for a particular embodiment can be used independently or in combination with other features in any other embodiment. Each feature described for an embodiment of a particular claim category can also be used accordingly in an embodiment of a different claim category.

[0061] Fig. Figure 1 shows a chain guide device 1 according to a first embodiment. The chain guide device 1 has a mounting module 4. This mounting module 4 is designed as a thin-walled support with a U-profile. The mounting module 4 is oriented vertically along its longitudinal axis and can be mounted, for example, on the floor of an elevator shaft 5 using connecting elements. The guide module 6 is arranged above the mounting module 4. It extends along a longitudinal axis which is oriented horizontally. The guide module 6 is also designed as a thin-walled support with a substantially U-shaped profile. In the middle of the guide module 6, it has two angle connectors which are oriented transversely to the longitudinal axis and project outwards transversely over one side of the support.At the ends of the outwardly projecting angle connectors, these are connected to the mounting module 4 in such a way that they, together with the guide module 6, can perform a pivoting or tilting movement about a pivot axis A. Additionally, a return element is provided above the mounting module. This return element, designed as a return spring, extends over the guide module in such a way that it bends elastically during the described tilting movement. The return element is thus charged with spring energy by the tilting movement and therefore assists in a return movement. At the same time, however, the return element also serves to provide a defined release resistance force, which prevents the emergency stop of the elevator system from being triggered even when forces are below the intended release resistance force.If, however, the trigger resistance force is overcome, the guide module is actuated by the tilting movement and the return element is bent. A recess 8 is provided at each of the two end regions of the guide module 6, through which the cable counterweight chain 2 is guided. The cable counterweight chain 2 comes from above and dips downwards into the first recess 8. Below the guide module 6, it then hangs in an arc or U-shape due to gravity and then runs vertically upwards again. It is guided from below through the second recess 8 of the guide module 6 and then continues upwards. Two rounded rubber rollers are arranged within each recess 8, which act as the first damping element 10.These rubber rollers 10 are arranged on the side of the respective recess 8 facing the center of the guide module 6, ensuring precise positioning within the recesses 8. The rope counterweight chain 2 running through the recess 8 is guided centrally within the recess 8 by the rounded shape of the rubber rollers 10 and centered between these two parallel rotating rubber rollers 10. This simultaneously dampens the noise and vibration of the rope counterweight chain 2. Rotatable guide elements 9 are arranged within the recesses 8 at the lateral boundaries transverse to the longitudinal axis of the guide module 6. Thus, one rotatable guide element 9 is arranged at each of the two lateral boundaries of each recess 8. Fig. 1. These are designed as cylindrical rollers. These cylindrical rollers 9 ensure that the rope weight compensation chain 2 does not get caught on the guide module 6 during lateral movements, but continues to be guided reliably and securely through the recess 8. In this embodiment, the detection device 7 is arranged on the mounting module 4 and attached via an angle bracket. It has a sensor device 11, which is designed as a limit switch and implemented in the form of a roller lever. This roller lever interacts with a protruding screw head, which is arranged on the angle bracket on the guide module 6.

[0062] Fig. Figure 2 shows the chain guide device 1 according to the first embodiment. Fig. 1, wherein the guide module 6 assumes a laterally tilted state relative to the mounting module 4. This state is enabled by the chain guide device 1 through a movable arrangement of the guide module 6 to the mounting module 4. The angle brackets arranged centrally on the guide module 6 project laterally beyond the guide module 6 and are movably connected at their protruding ends to the mounting module 4 in such a way that a pivoting or tilting movement of the guide module 6 relative to the mounting module 4 about a pivot axis A is enabled. During such a tilting movement of the guide module 6, a screw head arranged laterally in one of the angle brackets moves along a circular path from a first position to a second position. The first position of the circular path movement corresponds to the one in Fig. The arrangement shown in 1. The second position of the circular motion, however, corresponds to that shown in Fig. 2. The screw head essentially moves from a 0° position to a position of approximately 30° to 45° relative to the pivot axis A, although larger deflection angles are also conceivable. In the first position, the screw head actuates the limit switch by pushing the roller lever of the sensor device 11 to the side. As the guide module 6 moves, and thus also the screw head mounted on the angle bracket, the pressure on the roller lever decreases until the screw head has completely left the actuation range of the roller lever. From this moment on, the limit switch is no longer actuated, so that the change of state can be detected and transmitted to a control unit of the elevator system 3 (not shown). Additionally, in Fig. Figure 2 shows the second damping element 12. This is arranged between the mounting module 4 and the guide module 6 and is attached to the guide module 6. It is designed in the form of a round rubber stop buffer. The detection device 7 of the chain guide device 1 is triggered during the operation of an elevator system 3 if, for example, the rope counterweight chain 2 jams against elevator components, gets caught on them, or twists with itself. In all these cases, the rope counterweight chain 2 will exert a force on the guide module 6 such that the guide module 6 performs a tilting or pivoting movement about a pivot axis A as a compensatory movement. This movement then triggers the described sensor device 11, and thus the fault condition of the rope counterweight chain 2 is detected by the chain guide device 1.Additionally, a return element 19 is provided above the mounting module 4. This element is designed as a return spring and extends over the guide module 6 in such a way that it bends elastically during the described tilting movement, for example, in the event of a fault in the cable weight compensation chain 2. The return element 19 is thus charged with spring energy by the tilting movement and therefore supports a return movement as soon as the fault condition is resolved.

[0063] Fig. Figure 3 shows a detailed view of the detection device 7 according to the first embodiment of the chain guide device 1. Fig. 1 and Fig. 2. The detection device 7 is screwed to the mounting module 4 via an angle bracket. The sensor device 11, designed as a limit switch in the form of a roller lever, is positioned such that the roller lever projects beyond the upper edge of the mounting module 4. The second damping element 12 is also shown in the detail view. This element is located between the mounting module 4 and the guide module 6 and is attached to the guide module 6. It is designed in the form of a round rubber stop buffer.

[0064] Fig. Figure 4 shows a detailed view of a first end connector 16 of a rope counterweight chain 2 in a preferred embodiment. The end connector 16 has an upper and a lower section. The upper section is cylindrical and attached to the underframe of a car 17. The lower section is U-shaped and connects seamlessly to the upper section. A transverse bore is provided at each end of the legs of the U-shaped section, with both bores lying on a common axis so that they can be connected to each other by a cylindrical bolt. The last chain link of a round steel link chain can be fixed to such a cylindrical bolt. Due to the described design, the rope counterweight chain 2 retains the ability to pivot and rotate relative to the underframe of the car 17.

[0065] Fig. Figure 5 shows a detailed view of a second end connector 16 of a rope counterweight chain 2 in a preferred embodiment. The end connector 16 has two U-shaped plates which are aligned with each other at their apex and have recesses such that the last three chain links of a round steel link chain can be clamped between the plates in a pivotally and rotationally rigid manner. The end connector 16 can be connected to a substructure of a counterweight 18 of an elevator system 3 via the legs of the plates arranged above the clamping point.

[0066] Fig. Figure 6 shows a detailed view of a chain connector 15 according to a preferred embodiment of a rope weight balancing chain 2. The chain connector 15 is designed to connect two chain links of a round steel link chain while simultaneously maintaining important properties of the rope weight balancing chain 2. These properties include, for example, that the chain connector 15 has the same length in the chain extension direction as an ordinary chain link. Preferably, the chain connector 15 also has the same external dimensions in its width and / or thickness as the other chain links. The width and / or thickness refers to the two main extension directions of the chain links, which are arranged perpendicular to the chain extension direction. In the exemplary embodiment according to Figure 6, the chain connector 15 has the same width and / or thickness as the chain links. Fig. The chain connector 15 is designed in five parts. It has two U-shaped half-chain link elements, each of which has double-sided flattened areas with protruding lugs on its legs. These protruding lugs can be positively inserted into two plates enclosing the legs. The enclosing plates are pressed together with a screw connection, resulting in a force-fit and positive-locking connection of the five-part chain connector 15.

[0067] Fig. Figure 7 again shows the chain guide device 1 according to a first embodiment in a state as also shown in Fig. Figure 1 shows the component. However, it is shown together with a rope counterweight chain 2 and several components of an elevator system 3 to schematically illustrate a possible installation situation. The rope counterweight chain 2 is designed as a round steel link chain and, in the illustrated embodiment, consists of Fig. 7 consisting of three chain sections 13, each connected by a chain connector 15 according to the embodiment Fig. 6 are connected to each other. Furthermore, the rope weight balancing chain 2 has a first end connector 16 according to the embodiment. Fig. 4, which is attached to a car 17 or to its substructure. Furthermore, the rope counterweight chain 2 has a second end connector 16 according to the embodiment shown. Fig. 5, which is attached to a counterweight 18, or to its substructure. The design of the chain guide device 1 corresponds to the specification as also found in Fig. As described in Figure 1, the rope counterweight chain 2 and the chain guide device 1 interact at the two recesses 8 of the chain guide device 1. The rope counterweight chain 2 runs in a U-shape through the elevator shaft 5 and passes through the respective recess 8 in the chain guide device 1 in the lower shaft area, both on the car side 17 and on the counterweight side 18. The rope counterweight chain 2 is guided quietly, with minimal wear, and is protected against twisting. Additionally, fault conditions of the rope counterweight chain 2 can be detected by a deflection of the guide module 6 of the chain guide device 1. The return element 19, designed as a return spring, is elastically deformable and supports a return movement of such a deflection of the guide module 6.

[0068] Fig.Figure 8 shows a diagram of a preferred method for lengthening a rope counterweight chain 2 for an elevator system 3 with an extendable usable travel distance and a chain guide device 1. The first step of the method is to transfer the operating elevator system 3 into a maintenance state 100. This includes ensuring, among other things, that no persons are in the elevator cars 17 of the elevator system 3, that the doors are locked, and that no further transport requests are being accepted. In such a maintenance state, the elevator cars 17 can usually still be moved manually by a technician in the elevator shaft 5, so that the positions of the elevator cars 17 and counterweights 18 in the shaft 5 can still be changed.An optional step follows in which, for example, a technician moves the elevator cars 17 and / or counterweights 18 to positions in the elevator shaft 5 200 where chain extension can be carried out safely and reliably. Such a position is also referred to as the chain extension position. Subsequently, as a further safety measure for the chain extension process, the detection device 7 300 is triggered. This can be done, for example, manually by a technician who deflects the guide module 6 into a tilted position about the pivot axis A, thereby changing the position of the limit switch. In this described case, the optional reset element 19 is also charged. However, manipulation of the limit switch itself is also conceivable. In this case, an optional reset element 19 is not actuated.In the next step, a first end connector 16 is detached from the first chain section 13 400. The end connector 16 can be detached either below the counterweight 18 or below the car 17. Subsequently, the second chain section 13, intended for extending the chain, is connected at one of its two chain ends 14 to the open chain end 14 of the first chain section 13 via a chain connector 15 500. Then, the open chain end 14 of the second chain section 13 is connected to the counterweight 18 or car 17 via the previously detached end connector 16 600. This completes the extension of the rope counterweight chain 2. However, the detection device 7 must still be reset to an operating state 700. This is done analogously to triggering the detection device 7, usually by a technician.The elevator system 3 is then still in maintenance mode, but manual movement of the cars 17 and counterweights 18 is again possible. Subsequently, due to the now extended rope counterweight chain 2, the usable travel distance of the elevator system 3 can be extended 800. During this process, the chain guide device 1 monitors the faultless condition of the rope counterweight chain 2, in particular with regard to possible jamming, knotting, collisions or other impairments of the chain. After the extension of the usable travel distance of the elevator system 3 is completed, the elevator system 3 can be returned to an operational state in a final step 900. Reference symbol list 1 chain guide device 2 rope weight balancing chain 3 Elevator system 4 Mounting module 5 elevator shaft 6 Leadership Module 7 Detection device 8 recess 9 rotating guide element 10 first damping element 11 Sensor device 12 second damping element 13 chain section 14 Chain end 15 chain connectors 16 end connectors 17 elevator car 18 Counterweight 19 Return element A swivel axis 100 Transfer to a maintenance state 200 procedures of the elevator system into a chain extension position 300 Triggering the detection device 400 Detaching a first detachable end connector 500 Connecting the first and second chain sections 600 Connecting the second chain section to the car or the counterweight 700 Resetting the detection device 800 Extending the usable travel distance of the elevator system 900 Transferring the elevator system to an operational state 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 2023 / 160817 A1

[0006] EP 1 154 947 B1

[0006]

Claims

[1] Chain guide device (1) for a rope weight balancing chain (2) of a lift system (3), comprising: a fastening module (4) for fastening the chain guide device (1) in an elevator shaft (5), a guide module (6) for guiding the rope weight compensation chain (2) in an elevator shaft (5), a detection device (7), wherein the guide module (6) has at least one, preferably two recesses (8) designed to receive and guide a rope weight compensation chain (2), wherein the guide module (6) is connected to the mounting module (4), wherein the guide module (6) is movably mounted relative to the mounting module (4), wherein the detection device (7) is arranged between the mounting module (4) and the guide module (6) and wherein the detection device (7) is designed to detect a relative movement between the fastening module (4) and the guide module (6). [2] Chain guide device (1) according to claim 1, wherein the guide module (6) has at least one rotatable guide element (9) for guiding the rope weight compensation chain (2), preferably several conveyor rollers, particularly preferably four conveyor rollers, and wherein the rotatable guide elements (9) are arranged in the recesses (8) of the guide module (6). [3] Chain guide device (1) according to claim 1 or 2, wherein the guide module (6) has at least one first damping element (10) for damping operating noise and / or for damping chain movements in the horizontal direction, preferably several rubber rollers, in particular four rubber rollers, and wherein the first damping element (10) is arranged in one of the recesses (8) of the guide module (6). [4] Chain guide device (1) according to one of the preceding claims, wherein the recesses (8) and / or guide elements (9) and / or damping elements (10) are designed such that they guide the rope weight compensation chain (2) in a rotationally secure manner. [5] Chain guide device (1) according to one of the preceding claims, wherein the detection device (7) has at least one sensor device (11), wherein the sensor device (11) has in particular one or more displacement sensors, force sensors and / or switching sensors. [6] Chain guide device (1) according to one of the preceding claims, wherein the guide module (6) is mounted to tilt relative to the mounting module (4), and wherein the detection device (7) is designed to detect a corresponding tilting movement between the mounting module (4) and the guide module (6). [7] Chain guide device (1) according to one of the preceding claims, wherein the guide module (6) and / or the fastening module (4) has at least one second damping element (12), wherein the second damping element (12) is arranged between the guide module (6) and the fastening module (4), and is designed to dampen the relative movement between the guide module (6) and the fastening module (4). [8] Chain guide device (1) according to one of the preceding claims, wherein the detection device (7) generates an electronic output signal which enables condition monitoring of the rope weight compensation chain (2), wherein the output signal can be used in particular as an interlock signal for the operation of the elevator system (3). [9] Chain guide device (1) according to one of the preceding claims, wherein the detection device (7) can be connected to a control-side evaluation unit of an elevator system (3). [10] Rope weight balancing chain (2) for a chain guide device (1) of an elevator system (3) according to one of the preceding claims, comprising: at least one first chain section (13) comprising a first and second chain end (14) and a second chain section (13) connectable to the first chain section (13) via at least one detachable chain connector (15), having a third and fourth chain end (14), wherein the first chain end (14) can be connected to a car (17) of an elevator system (3) via a first detachable end connector (16) and wherein the second or fourth chain end (14) can be connected to a counterweight (18) of a lift system (3) via a second detachable end connector (16), wherein one of the chain ends (14) has a rotatable and / or pivotable end connector (16) and wherein another chain end (14) has a torsionally rigid and / or pivotally rigid end connector (16). [11] Method for extending a rope weight compensation chain (2) according to claim 10 for an elevator system (3) with an extendable usable travel path and a chain guide device (1) according to any one of claims 1 to 9, comprising the steps: Transferring the elevator system to a maintenance state (100), If necessary, move the elevator system into a chain extension position (200), Triggering the detection device (300), Detaching a first detachable end connector (400) from the first chain section (13), Connecting the second chain section (13) to the first chain section (13) using the first detachable chain connector (15) (500), Connecting the second chain section (13) to the car (17) or the counterweight (18) using the released end connector (16) (600), Resetting the detection device (700), Extending the usable travel distance of the elevator system (800), and Transferring the elevator system to an operational state (900).

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