DRIVE SYSTEM, SPRING WEIGH SYSTEM AND METHOD FOR SIMULATING AN ELASTIC CLAMPING ELEMENT

Description

[0001] The present invention relates to a drive system for a spring cradle, a spring cradle system and a method for simulating an elastic tensioning element.

[0002] There are numerous spring cradles available, primarily for babies and children. Typically, such a spring cradle consists of a lying device similar to a baby carrier, attached to a spring suspension. The spring suspension is connected via an elastic oscillating element, usually a spring, to a frame or other support structure such as a door frame, allowing it to swing freely. A load-bearing drive system is usually mounted on this suspension. This drive system includes an electric motor that periodically exerts a tensile force on the spring suspension via a pulley, thus setting the cradle into an up-and-down oscillating motion.

[0003] In conventional spring cradles, the drive system is connected to the spring suspension via the pulley system, which is kept under constant tension. This is necessary so that the drive system receives information about the spring's compression and rebound movements, enabling it to apply traction force during the spring's ascending movement and not during its descending movement. Since the oscillation amplitude varies depending on the spring used, the weight (child plus carrier, plus accessories, etc.), and the applied force, the pulley system is equipped with a mechanical tensioning element to ensure it remains under constant tension. This tensioning element is usually implemented as a coil spring on the motor's drive shaft. The tensioning element ensures that the pulley system maintains its tension despite varying distances resulting from the weight of the child or carrier, the installed springs, the amplitude intensity depending on the drive energy, and other factors.This results in a continuous connection to the drive system, independent of the spring's deflection. This ensures that a sensor, such as an actuator or dynamo, can receive information about the oscillation speed and direction and thus control the energy used to amplify or maintain the oscillation.

[0004] The problem with this design is that the mechanical clamping element does not allow for silent operation of the drive system. In practice, the drive system sometimes generates noise levels of up to 63 dB(A).

[0005] WO 2010 / 098702 shows a child movement system comprising a vertical motion generation unit with an energy source of an electrical coil and an elastic means which is attached to the coil.

[0006] US 2008 / 0217974 A1 shows a child movement device with a frame which provides structural support.

[0007] US 2005 / 0283908 A1 shows a baby rocking system with a support arm and a cradle. The cradle can be moved by an actuator.

[0008] CN 108771392 A shows a bionic children's bed which is movable via a lifting mechanism.

[0009] EP 3 197 323 B1 relates to a device for generating a rocking motion on baby supports, comprising a frame arranged on a base with a support arm and a traction element designed for suspending the support.

[0010] According to one aspect of the present invention, a drive system for a spring cradle system, in particular for a child or baby spring cradle, is provided for generating an oscillating motion, comprising the technical features of claim 1.

[0011] Accordingly, a drive system for spring cradles is provided that operates without a mechanical tensioning element. Consequently, the drive system operates almost silently. Furthermore, this increases its durability, as fewer mechanical components are used. According to one embodiment, the functionality of a mechanical tensioning element can be algorithmically imitated via a microcontroller-controlled drive unit. Thus, no mechanical tensioning element is required in the drive system.

[0012] The drive system comprises a drive unit, namely an electric motor with a rotating shaft. Rotation of this shaft winds the traction element, namely a rope, thereby transmitting a tensile force through the traction element towards the drive system. This allows, for example, the oscillating element to be moved towards the drive system. The traction element can be wound onto a pulley or sheave located on the shaft of the drive unit. When the drive unit is not in operation and the oscillating element is moving away from the drive system, the traction element can unwind from the sheave, causing the shaft of the drive unit to rotate in the opposite direction. This allows the free length of the traction element (i.e., the portion of the traction element corresponding to the distance between the drive system and the oscillating element) to be varied.

[0013] Varying the free length of the traction element can initiate oscillation of the oscillating element. An oscillating motion performed by the oscillating element can be a movement whose sequence repeats periodically in the same or very similar form, or according to predefined motion patterns, especially complex motion patterns. The motor can be directly connected to a pulley. In other words, in this case, no gearbox or similar component can be used between the motor and the pulley. This allows the force to be applied efficiently and avoids large leverage effects. Furthermore, a small pulley can be used. For example, the pulley diameter can essentially correspond to the rotor diameter of the motor. However, the smaller the diameter (e.g., the inner diameter) of the pulley, the more frequently the traction element (e.g., a rope) will wind itself over itself.This can lead to random, uncontrollable slippage of the pulling element if it bunches up at one point and then slides back down. Therefore, the drive system can be equipped with a single-track pulley. Further details about the pulley follow below. However, it is also conceivable to include a gearbox between the motor and the pulley to convert and / or reduce the motor's drive power.

[0014] The traction element can be a strap-like element, such as a rope or cord, designed to support the swinging element and any person it carries. A proximal end of the traction element can be connected to or engaged with the pulley, so that the traction element is held against the pulley even when it is no longer wrapped around it. The distal end of the traction element can be the end opposite the proximal end, which is connected or connectable to the swinging element. A section (i.e., a specific length) of the traction element that is not wrapped around the pulley can define the free length of the traction element.

[0015] The drive unit is an electric motor that generates a rotational movement when supplied with electricity and transmits this motion, for example, to a roller via a shaft. The direction of rotation of the electric motor can be varied. The drive unit can, for example, include sensors that measure the current applied to it and thus provide information about its operation. Furthermore, the rotational energy output by the drive unit can be measured. Therefore, by supplying the drive unit with a predetermined current and determining an output from the drive unit, the control unit can ascertain whether the tension element is connected to the oscillating element under tension or not. The preload force can thus be determined by a defined power supply (for example, by applying a certain voltage) to the drive unit.

[0016] The swinging element can consist of a stretcher or cradle for accommodating at least one person and a suspension device on which the stretcher is suspended.

[0017] The control unit can ensure that the tension element is always under tension with the oscillating element by controlling the drive unit. This is achieved by applying a sufficiently high minimum force (preload) to the tension element, which pulls it towards the drive system (i.e., applies a torque to the shaft, causing the pulley to rotate until the tension element is under tension with the oscillating element). This minimum force can be less than the weight of the oscillating element without the person inside. As soon as no further movement of the tension element is detected, it is "under tension" and establishes a direct connection between the oscillating element and the drive unit. Applying further preload is then unnecessary, and the drive unit can be switched off. The drive system is thus in its resting state.The control unit can thus simulate the mechanical tensioning element used to maintain the tension of the tensioning element in known spring cradles. However, while in a mechanical tensioning element the tensile force acts as a damper on a downward oscillating movement of the oscillating element and must be compensated by drive energy, the control unit of the drive unit only generates a preload force (tensile force) to maintain the tension of the tensioning element when necessary. Therefore, the drive system of the present invention can be operated more efficiently.

[0018] As soon as the control unit registers movement of the tensioning element and the system is at rest, the control unit can control the drive unit so that the preload is applied to the tensioning element. This ensures a direct connection between the tensioning element and the oscillating element. This is advantageous, for example, when a person is being loaded into a suitable device attached to the oscillating element.

[0019] As soon as the control unit detects that the oscillating motion is moving away from the drive system, the drive unit can be controlled so that no preload is exerted on the tension element. Otherwise, the drive unit would generate a force in the opposite direction of the oscillation, which would negatively affect the electronics, energy consumption, and oscillation intensity.

[0020] Preferably, the tension element is provided on the drive system such that it extends away from a central point of the drive unit. The central point of the drive unit can be its center of gravity. In other words, the central point of the drive unit can be its center point when viewed from above (in the direction of gravity). In particular, by omitting a mechanical clamping element, the drive unit can be designed such that the tension element exits the drive unit centrally. In other words, the tension element can exit the drive unit at its center of gravity. In products known from the prior art, the tension element is arranged offset (i.e., eccentrically) from the center of gravity of the drive unit. Thus, the oscillating element is also arranged eccentrically beneath a drive unit.If, in such a case, the drive unit is attached to a rope or a door clamp, for example, this offset induces a pendulum motion, resulting in a rocking motion of the entire system. A rocking pendulum motion does not occur when the pull element is centered in the drive unit.

[0021] Furthermore, the drive unit is designed to enable automatic, hands-free operation. This can include two modes. Firstly, in a standby mode, it can monitor whether the oscillating element is deflected, for example, when a child is placed in the crib. If deflection is detected, it can be checked whether an oscillating motion can be generated. An oscillating motion can be generated if the oscillating element is free to swing. If this is the case, the drive unit can switch to an operating mode. Thus, the drive system can activate automatically (i.e., switch to operating mode) as soon as deflection of the oscillating element is detected.

[0022] In standby mode, a short, minimal force impulse can be applied to the oscillating element at periodic intervals to tighten the tensioning element. When this operating state is activated, it can be checked whether an external influence leads to a drastic reduction in vibration intensity. If such a reduction in vibration intensity is detected, the drive system can switch to a cool-down mode and activate standby mode after the system has come to a standstill. This automatic switching between different operating modes can be deactivated or activated by the user.

[0023] The control unit can comprise a single-board computer running a standardized operating system, such as Linux, allowing for the connection of any standard components. For example, the control unit can feature a standardized interface such as a USB port, an SD card reader, or similar. Furthermore, developers can be provided with access to plugins to add further functionalities to the drive system using these standard components. This allows the control unit to be equipped with additional control sequences, for example, to execute customized vibration patterns.

[0024] The drive system can feature a single-track pulley for winding and unwinding the traction element. The single-track pulley prevents the traction element from skipping, a problem that could occur with an uncontrolled multi-track pulley. This eliminates noise and vibrations during operation caused by uncontrolled skipping of the traction element (e.g., a rope) on the pulley, ensuring safe operation of the drive system. Alternatively, a pulley with a guided track can be used in conjunction with a rope guide. This results in a constant torque and also improves the measurement accuracy of any rotation sensor, as the rotational speed remains nearly constant regardless of the traction element's length. Consequently, a constant force can be transmitted from the drive unit to the traction element and vice versa.This ensures a particularly smooth operation of the drive system.

[0025] According to one aspect of the present invention, the drive system can comprise a powerful motor as a drive unit in conjunction with a guided track for the tension element, a guide for the tension element, a mechanical lock, and a recuperation device. Thus, a spring cradle system can be implemented even without an elastic oscillating element. This improves the aesthetic appearance of the spring cradle system while still providing the same functionalities as with an elastic oscillating element.

[0026] Furthermore, the drive system can have a mechanical lock that prevents the pull element from deflecting. This prevents the distal end of the pull element from shifting. Consequently, the distance between the drive system and the oscillating element can be kept constant regardless of the load on the oscillating system. This is advantageous, for example, when a child or baby is being placed in or taken out of the oscillating system.

[0027] According to a further aspect of the present invention, the drive system can be designed to bear a payload by suspending it from a stationary support and suspending a vibrating element (e.g., a payload device) over at least the tensioning element. Preferably, in addition to the tensioning element, a restoring element (e.g., an elastic element) is provided between the vibrating element and the drive system. Alternatively, the drive system can be designed not to bear a payload. In this case, the drive system can, for example, be placed on a frame and connected to the vibrating element via the tensioning element. The vibrating element can then be attached to a frame or other device directly or indirectly (e.g., via an elastic element).

[0028] Preferably, the drive system is arranged above (with respect to the direction of gravity) the oscillating element, so that the preload force is applied to the tensioning element in the opposite direction to gravity. However, the drive system can also be arranged below the oscillating element, so that the preload force is applied to the tensioning element in the direction of gravity.

[0029] According to one aspect of the present invention, longevity can be achieved by eliminating the need for mechanical sensors. For example, only non-mechanical sensors can be used to determine the position of the oscillating element relative to the drive system. By using a microcontroller-based, intelligent control system, an energy-optimized oscillation can be realized, since no mechanical sensors dampen the oscillation and only minimal friction losses exist. Furthermore, the intelligent control of the control unit can ensure that only minimal oscillation energy is expended to promote calm behavior in the child / baby.

[0030] Preferably, the drive system further comprises at least one sensor for determining a displacement of the distal end of the traction element, wherein the at least one sensor is preferably a non-contact sensor.

[0031] The mechanical sensors used in state-of-the-art systems to measure vibration velocity and direction, such as those employing dynamos and actuators, negatively impact the durability of the drive system, as these components are prone to rapid wear. Furthermore, sustainability is negatively affected because the production of these components consumes energy, and dynamos in particular dampen vibrations, thus requiring more traction. Additionally, mechanical components generate noise, especially the whirring operating noise of actuators.

[0032] To measure the displacement of the oscillating motion, a non-mechanical sensor can be used that can detect the displacement of the distal end of the traction element (i.e., the movement of the traction element). This could be an optical motion sensor, which can optionally measure the rotation of a drive unit shaft and / or the velocity of the traction element. However, other sensors can also be used for the measurement, such as ultrasonic sensors or electromagnetic sensors (e.g., Hall effect sensors). The sensors can measure the movement of the traction element directly on the traction element itself, on the drive unit shaft, directly in the motor, on the pulley, or on an additional component, such as a rotor that rotates with the shaft. In other words, a three-phase motor with integrated sensors could be used as the motor, for example.

[0033] Thus, the drive unit can be an actuator controlled by the control unit based on control logic. For this purpose, the control unit can receive and process sensor data (i.e., measured values) from at least one sensor. As a result of this processing, the control unit can issue control commands that control the drive unit. A standardized single-board computer, preferably a Raspberry Pi, can be used as the control unit, capable of controlling the drive unit and acquiring and processing the sensor data. However, other controllers can also be used.

[0034] According to one aspect of the present invention, when the drive system is started, the traction force of the drive unit must expend more energy to initiate the vibration of the oscillating element than is necessary to maintain its oscillation, since the entire weight of the oscillating element must be moved against gravity. The problem, however, is that excessive traction force combined with the low weight of the oscillating element can lead to a sudden, unintentionally strong acceleration or an unintentional exceeding of the permissible vibration amplitude. Therefore, the control unit can be designed to control the drive unit at very short intervals (a few milliseconds) to influence the movement of the traction element.In parallel, the displacement of the distal end of the traction element can be measured via at least one sensor, and the control of the drive unit can be adjusted based on this measurement data. Thus, the traction force of the drive unit can be actively controlled. Furthermore, it is possible to start with a small traction force (for example, 10% of the maximum traction force or the maximum power of the drive unit). The drive unit can have a power output of 2 W to 10 W. It can be operated with 12 V DC, ensuring efficient operation. When used to drive a baby hammock, the power output of the drive unit is preferably between 3 W and 5 W. A power output of 3.8 W (0.6 A at 12 V DC) has proven particularly efficient. The traction force can then be increased until a displacement is measured by the at least one sensor.During each oscillation (e.g., at half a period), the ratio of actual to desired oscillation amplitude can be checked, and the control unit can adjust the drive unit's operation to achieve the desired amplitude. The closer the oscillation amplitude is to the desired target value (i.e., oscillation intensity) set via a controller, the less force is applied by the drive unit to achieve the desired amplitude as smoothly as possible. The desired minimum number of oscillation amplitudes required to reach the desired intensity can be stored as a configuration parameter in the control unit's memory. This allows the control unit to manage the drive unit in such a way that the desired oscillation amplitude is reached very smoothly or in such a way that it is reached quickly.Thus, the drive unit can be adapted to any requirements and individually controlled by the control unit.

[0035] The control unit can therefore be designed to initiate actions (i.e., control the drive unit) and verify whether the result (i.e., the vibration) corresponds to the expected outcome. In case of deviations, conclusions can be drawn, for example, by artificial intelligence or a rule-based system, which can optionally be displayed to the user and / or lead to adjusted control by the control unit. This allows damage to the drive system and / or external disruptive factors to be detected early and communicated to the user (e.g., a defect in the traction element, a foreign object in the oscillation area, resistance during suspension travel, etc.).

[0036] The control unit allows the drive system to have a so-called "cool-down" function, which dampens the oscillation when switched off by accelerating the amplitude in the opposite direction and preventing further oscillation by utilizing the drive unit's power. The number of oscillations required to stop the oscillation can also be specified.

[0037] Furthermore, the drive system can be controlled by the control unit according to a standby or hold function, in which the drive unit is controlled in such a way that the distance between the swing element and the drive system remains as constant as possible to simplify loading and unloading a person into the swing element. In this case, movement of the pull element can be detected and the drive unit controlled to generate a pulling force in the opposite direction.

[0038] Furthermore, the control unit can be equipped with an emergency stop function that can be triggered via a dedicated switch, a control element, and any internet-connected control elements, such as voice assistants, apps, etc. This emergency stop function uses the maximum available power of the drive unit to stop the oscillating motion as quickly as possible. This allows the operation of the drive unit to be terminated as quickly as possible in an emergency.

[0039] Preferably, the drive system further comprises an electronic shutdown device, wherein the control unit is configured to periodically send operating signals to the shutdown device, and wherein the shutdown device is switched off to automatically interrupt the power supply to the drive unit when it no longer receives operating signals. In other words, the drive system can have an electronic shutdown device or emergency stop assembly (for example, a relay) that is switched off to automatically interrupt the power supply to the motor when no signals (for example, from a signaling unit) are received. The electronic shutdown device can be part of the control unit. This serves to protect against burnout of the motor (i.e., the drive unit).This could occur, for example, if the control unit's software malfunctions or freezes, or if a single-board computer within the control unit fails during operation while the motor is powered. Furthermore, the drive unit and / or the control unit can be designed to send signals to the electronic shutdown device during operation (e.g., from a signaling unit) to prevent a power cut. This emergency shutdown can also be initiated by the control unit if sensor readings indicate a system malfunction that prevents further operation, such as a broken or jammed traction element. Operating signals can be, for example, operating commands or standardized signals sent at predetermined intervals. This can increase operational reliability.

[0040] Furthermore, the control unit (e.g., via control software) can be designed to continuously monitor sensor values ​​and / or outgoing control signals. If deviations from the intended behavior occur, a fault can be logged. This allows for a distinction between faults that prevent operation, such as a broken or blocked traction element, and faults that restrict operation, such as reduced motor performance. The control unit can be designed to communicate such faults to a user in the form of notifications (e.g., via an app, housing LED, etc.).

[0041] According to another embodiment, the drive system can have a force sensor designed to detect the force applied to the traction element.

[0042] The force sensor can be a strain gauge, a piezoelectric force transducer, or a similar device. This allows the force acting on the tensioning element to be measured. Changes in this force allow the control unit to infer various states of the oscillating element. For example, an abrupt increase in the force acting on the tensioning element could indicate that it has become stuck or that there has been an unintended external interference with its oscillation. Furthermore, a sudden decrease in the tensioning force could indicate that a person has been removed from or fallen out of the oscillating element. The force sensor can also determine whether the tensioning element is sagging or is connected to the oscillating element under tension. This occurs when the preload force applied by the drive unit is measurable by the force sensor. In this case, the control unit can determine that the tensioning element is connected to the oscillating element under tension.

[0043] According to another embodiment, the control unit is designed to control the drive unit based on the force detected by the force sensor.

[0044] Based on the information obtained from the force sensor, the control unit can react. For example, in the event of a sudden increase in tensile force in the tensioning element, it can stop the operation of the drive unit to prevent potential damage. Additionally, a notification can be sent to an interface or output device. Similarly, in the event of a sudden drop in tensile tension in the tensioning element, the control unit can stop the operation of the drive unit and / or issue an alarm. Furthermore, the information about the force acting on the tensioning element can be used to check whether the tensioning element is under tension or sagging. As soon as the control unit detects that the tensioning element is under preload, it can assume that the tensioning element is under tension and therefore not sagging.

[0045] Preferably, the preload force is less than 15% of the maximum power of the drive unit, preferably less than 10% of the maximum power of the drive unit, and more preferably less than 8% of the maximum power of the drive unit.

[0046] The preload force can be greater than the force resulting from the tensile element's own weight. Once the preload force is greater, the tensile element can be tensioned. However, it is not necessary to exceed the force resulting from the tensile element's own weight and any person it may be carrying, as the preload force is only intended to tension the tensile element and not to move the oscillating element. The maximum power of the drive unit can be determined by its intended use. If it is to be used to vibrate relatively heavy objects and / or people, the drive unit can have a higher power output. At the same time, the tensile element must also be sufficiently robust to support a relatively heavy load.It was found that with a preload of less than 15% of the drive unit's maximum power, the pull element can be reliably preloaded, thus preventing sagging. This also applies when the pull element runs at least partially at an angle to the vertical. A value of less than 10% of the maximum power is particularly advantageous when the pull element runs vertically, as less force is then required to tension it (i.e., to pull it smoothly). A preload of less than 8% offers particular advantages when using the drive unit in baby or infant spring cradles, as it allows for particularly efficient and quiet operation. Furthermore, this preload is sufficient for the often delicately designed pull element used in these applications.

[0047] Preferably, the control unit is further configured to control the drive unit in such a way that the oscillating element performs a predetermined oscillating movement.

[0048] A microcontroller-based control unit enables more complex vibration patterns than just a uniform, continuous oscillation. For example, a vibration pattern similar to that experienced while driving a car can be simulated. After-oscillation can be prevented by the stop function, which dampens the oscillation until it comes to a standstill, and manual intervention can suppress oscillation. The desired vibration intensity can be achieved algorithmically by varying the force applied for a desired duration (i.e., potentially quickly) and then maintained at that level. The control unit can detect a varying load on the oscillating element (for example, via the force sensor mentioned above and / or by measuring the amplitude of the oscillating element) and control the drive unit accordingly, ensuring that the applied force is transferred to the payload (i.e., the load).The control unit is calibrated to the weight of the vibrating element and any persons mounted within it. It can also detect operation outside a permissible vibration range and subsequently issue a warning and / or initiate an emergency stop.

[0049] The control unit can measure the oscillation amplitude. If the oscillation amplitude is plotted on a Y-axis and time on an X-axis, a harmonic oscillation can be represented as a curve resembling a sine wave. The oscillation velocity can be highest approximately when passing through the equilibrium point (i.e., the point of rest in the non-oscillating state) and decrease as it approaches the minimum or maximum amplitude (i.e., the turning point). The control unit can use this knowledge of the oscillation profile to activate the simulation of the tension element described above shortly before reaching the turning point, ensuring that the tension element remains constantly connected to the oscillating element under tension throughout the entire duration of the oscillation.

[0050] Furthermore, the control unit can measure deviations from the expected vibration amplitude in order to adjust or shut down the control of the drive unit. For example, the control unit can detect when the vibration pattern deviates from the sinusoidal waveform, such as when no measurements are recorded at the upper reversal point. Additionally, the control unit can be designed to measure deviations of the actual vibration motion from predetermined complex vibration patterns (e.g., simulating a car ride) and adjust the control of the drive unit accordingly. In this case, the applied force is too high relative to a spring (as an example of a restoring element) and the weight of the vibrating element, and the spring reaches a point where it can no longer compress.This undesirable event can be detected by the control unit and corrected by automatically reducing the maximum force exerted by the drive unit.

[0051] Furthermore, a user can control the intensity of the vibration via an interface. The user can vary the intensity using a control (plus / minus rocker switch, potentiometer, mobile app, or electronic control panel). Based on the vibration in relation to the applied force, the control unit can detect whether a lower or upper limit has been reached and prevent operation outside these ranges. The lower limit of a vibration is reached when harmonic oscillation is no longer possible, either because the movement would be so small that it would no longer be perceptible as a vibration, or because the detection accuracy of the control unit and / or sensors is insufficient to detect any vibration. The upper limit is reached when, as described above, no upper reversal point can be measured.In this case, the force applied by the drive unit can be reduced by the control unit to such an extent that the upper limit reaches a harmonic oscillatory motion.

[0052] In a preferred embodiment, the oscillation can be controlled via slide or rotary controls as well as rocker switches (+, -) on the drive system, or via corresponding visualizations on the surface of a touchscreen or an app. According to one aspect of the present invention, the user can set the oscillation intensity within a range of minimum and maximum intensity. Thus, the user can set the predetermined oscillation. If the user sets the control to any value, a small force is initially applied and its effect on the oscillation is measured. The force is then increased at defined time intervals (for example, in 0.5 s or 5 ms increments) until the control unit detects a displacement. The control unit can then determine the weight of the oscillating element and / or the characteristics of a spring.The force control is gradually adjusted until the vibration amplitude reaches the set value. Therefore, the force initially increases until the oscillating element begins to move, and as the vibration approaches the set intensity, the force decreases until, upon reaching the set vibration intensity, it only contributes to maintaining the oscillation.

[0053] Preferably, the drive unit is designed to apply a variable force to the traction element. Thus, the drive unit can be configured to apply a variable force to the traction element over a oscillation cycle. In other words, the total force per oscillation can be applied variably or constantly throughout the entire upward movement. In a preferred embodiment, a lower current is applied at the extreme point of the oscillation (e.g., at the inflection point of the oscillating element) than at the apex of the oscillation, where the velocity is highest. This ensures, in particular, that the traction element experiences a smooth transition during changes of direction, even in the presence of external disturbances; the abrupt application of full motor power can lead to undesirable acoustic effects.Furthermore, it proved to be more energy-efficient to apply the required pulling force over a period of time at a higher speed of movement, and it also leads to a more natural movement because it corresponds to an acceleration characteristic when swinging manually with the hand.

[0054] The control unit can also automatically regulate the intensity. This allows for an initial minimal oscillation to minimize energy consumption. As soon as the control unit receives information, for example from additional sensors (such as a vibration sensor or a microphone), the oscillation intensity can be increased or decreased. Thus, when using the drive system with a baby hammock, for instance, the system can react to restless behavior by automatically adjusting the drive unit's operation. This is based on the practical observation that children fall asleep more easily with a higher oscillation amplitude. Furthermore, if the sensors detect restless behavior in the child, a notification can be sent, for example, as a push notification to a smartphone.

[0055] In addition to harmonic oscillation, the control unit can realize any other motion patterns (e.g., vibration patterns) that can be represented by up and down movements by controlling the drive unit. Upward movement is limited by the fact that the load of the oscillating element cannot be pulled further against gravity by the maximum tensile force of the drive unit, or that any elastic element is fully compressed. Downward movement is determined by the maximum deflection of the spring, which results from the installed safety cable of a spring, or by the maximum length of the tension element. The maximum upward acceleration is determined by the maximum tensile force of the drive unit, and the maximum downward acceleration by gravity. The maximum damping of a downward movement is determined by the maximum tensile force of the drive unit.This feature, combined with the drive unit's very fast response time, allows for a wide variety of movement patterns. Furthermore, additional output devices, such as speakers or lights, can be integrated into the drive system. Music or custom-recorded audio files can be played through the speakers. The user can configure the playback of an audio file or light show to be triggered by the child's activity. The drive unit can utilize all available sensor data to register the child's activity in the crib (such as acceleration and deceleration impulses characteristic of hip movements or turning). From this data, an activity index (e.g., 0-5) can be calculated, providing an indication of the child's restlessness.The user can configure the activity index threshold at which they wish to be notified – for example, to be present when the child wakes up. Furthermore, the user can configure the system to play audio files or light displays when a certain activity index threshold is reached. The output devices can also be controlled by the control unit to realistically simulate situations in conjunction with the movement patterns.

[0056] For example, a car ride can be simulated. In addition to the control unit storing appropriate settings for the drive unit, the drive system can communicate via an interface with an app that allows the user to record a car ride. This takes into account the experience that children respond differently to different driving profiles. The app can record vehicle noises, vibrations, and brightness profiles (such as those caused by passing streetlights). The user can select parts of the recording, optionally hiding measurement data like brightness, and transmit it to the drive system. The drive system can then play back this profile by controlling the drive unit and / or the output devices accordingly to simulate vibrations, noises, and / or light profiles (e.g., from passing streetlights).

[0057] The control of the drive unit, i.e., all actions (on, off, faster, slower, etc.) and the execution of movement patterns, can be carried out via any connected or integrated interfaces (interaction mechanisms), such as a touch display, a mobile app, or integration with voice assistants (e.g., Alexa or Siri). These interaction mechanisms can also be used to communicate feedback, information, and notifications.

[0058] Preferably, the drive system includes an energy storage device designed to supply power to the drive unit and the control unit. In other words, the drive unit can have a built-in energy storage device (e.g., a battery) to ensure wireless operation. This enables mobile use without a power supply and ensures continued operation in the event of a power outage. The control unit can be designed to adjust the vibration intensity to the remaining battery capacity so that the desired remaining vibration duration, which can be set via a timer, is achieved as closely as possible.

[0059] Preferably, the drive system is controlled via a mobile app that communicates with the drive system using Bluetooth or Wi-Fi. According to one aspect of the invention, simple Bluetooth pairing is provided, whereby the pairing mode of the drive system can be activated by pressing one or more control elements on the drive unit or a touchscreen. In a preferred embodiment, a touchscreen for controlling the drive system is detachable from the drive system so that it can be positioned ergonomically. It can be connected to the drive system via cable or wirelessly.

[0060] Preferably, the drive system comprises at least one restoring element that connects the drive system to the oscillating element.

[0061] The restoring element can be a spring or another element that can deform elastically. In other words, the elastic element can deform when a load is applied and return to its original position after the load is removed.

[0062] Elastic elements (e.g., springs) can be characterized, for example, by their spring constant. Furthermore, the restoring element can be defined by a preload force and / or the number of springs used. In a preferred embodiment, different springs with a preload force of 5 N per spring and different spring constants can be used. The resulting spring deflection is determined from the spring constants in conjunction with the applied force. The spring constants are derived from the applied force and the resulting spring deflection.

[0063] The drive system can be operated with various elastic elements. The springs can be used in combination or substitution between the drive system and the oscillating element. Different springs can be assigned different weights to be supported by the oscillating element (e.g., base spring 3-5 kg, each additional spring +1 kg). Based on the applied tensile force in conjunction with the amplitude and oscillation frequency, the control unit can identify which springs are being used. Furthermore, the control unit can determine whether the springs used are suitable for the payload. An individual setting for an optimal oscillation motion, including a tolerance range, can be stored in the control unit. If a deviation occurs, the user is notified depending on the degree of deviation (flashing LED, notification in a mobile app (especially push notification), Alexa notification, etc.).) and, if necessary, the additional refusal to operate the business.

[0064] The user can add further accessories (such as additional springs) as well as additional functions. To do this, the user can link their drive unit to their profile, which may be stored on an operator's website.

[0065] Preferably, the control unit is designed to automatically detect properties of the restorable element and to control the drive unit based on these properties.

[0066] In the preferred embodiment, the restoring element can be varied for different loads that may occur on the oscillating element. The control unit can be configured to recognize different restoring elements and determine their parameters. These parameters, in particular the spring constants, can then be stored by the control unit as configuration parameters and taken into account when controlling the drive unit. Thus, different restoring elements can be used without the need to manually enter the parameters of the new restoring elements into the drive system. Instead, the drive system (in particular the control unit) can automatically recognize a restoring element and its parameters and automatically adjust the operation accordingly. This simplifies the use of the drive system.

[0067] The spring constant (spring stiffness) or the spring characteristic curve can be used as parameters of the restoring element (for example, a spring). These describe the relationship between deformation (displacement s or angle φ) and force F or torque Mt. Like the underlying Hooke's law, the spring characteristic curve is usually linear to a good approximation and can, in this case, be characterized by a spring constant (as its slope). According to one aspect of the invention, a restoring element with a non-linear characteristic curve can be used. It has been found that, particularly when using the drive system to power a baby cradle, a non-linear characteristic curve results in an oscillation pattern that quickly soothes the child placed in the oscillating element.

[0068] Preferably, the drive system comprises a recuperation device designed to recover energy from the oscillating motion of the oscillating element.

[0069] Preferably, the drive system comprises a drive unit with a guided track for the traction element, a guide for the traction element, a mechanical lock, and the recuperation device. The recuperation device can be an electric machine driven by the traction element when the oscillating element moves away from the drive system. In other words, the recuperation device can be driven when the oscillating element is moved by gravity. Thus, an elastic oscillating element is not required in this case. This allows the drive system to be more compact, as no restoring element needs to be connected to the drive system and the oscillating element.

[0070] According to another aspect of the present invention, a spring cradle system is provided, comprising: one of the above drive systems, which can be arranged in a fixed location, and a oscillating element for accommodating at least one person, wherein the oscillating element is attached or attachable to the pulling element.

[0071] The oscillating element can comprise a stretcher or cradle and a suspension element, wherein the stretcher or cradle can be a sling or a rigid bed that is attached to, or can be attached to, the suspension element. At least one person (e.g., a child or baby) can be accommodated in the stretcher. The spring cradle system can be equipped with a tilt sensor. Preferably, the tilt sensor is arranged on the oscillating element or the tensioning element. This allows the control unit to acquire information about the position of the oscillating element and control the drive unit based on this information. Furthermore, the spring cradle system can comprise a pulley attached to a frame on which at least the oscillating element is suspended. The tensioning element can be guided over the pulley and connected to the drive unit and the oscillating unit, such that a force vector of the tensioning element is inclined to the vertical.Preferably, the force vector transmitted from the tension element to the swing unit is inclined at an angle of approximately 45°. This advantageously initiates a rocking motion. The drive system can be fixed to a stationary point (e.g., a door frame or a stand). The spring cradle system can have a mounting mechanism for this purpose. The swing element can be connected to the drive system below the tension element and, optionally, to a restoring element. Since the payload-bearing drive unit is always on the same axis as the restoring element and thus the payload, the tilt sensor provides input data to achieve a smooth rocking motion through appropriate force control. Analogous to the above, the control unit can also perform cool-down, standby, and emergency stop functions during the rocking motion.

[0072] The spring cradle system can be used as a baby cradle system. Furthermore, the spring cradle system can also be used by adults.

[0073] Preferably, the spring cradle system comprises at least one sensor designed to detect the state of the at least one person held in the oscillating element, wherein the control unit is designed to control the drive unit based on the detected state and / or to output the state of the at least one person to an output unit.

[0074] The sensor can, for example, include a thermal imaging camera that detects if the person inside the vibrating element is too cold or too warm and informs a user. Furthermore, the sensor can include a vibration sensor and / or a microphone to record the person's activity. Based on this sensor data, the control unit can control and adjust the operation of the drive unit. The control unit can also record and store various reactions of the person to different vibration patterns, thus generating empirical data on which vibration patterns most frequently elicit which reactions. For example, the control unit can determine which vibration pattern soothes or helps a baby fall asleep. Using empirical data and / or sensor data, the control unit can also calculate and display an average sleep duration for the person.The user can be informed about statuses and / or expected events via push notification or Alexa alerts, allowing them to be at the baby hammock in time, for example, before a baby wakes up. Furthermore, the sensor can include a moisture sensor that detects, for example, when a baby's diaper is wet. This information can also be shared with the user, for example, via a display on the baby hammock and / or via an interface, particularly wirelessly, to a mobile device.

[0075] In particular, to enable the above-mentioned functions, the control unit can include artificial intelligence capable of monitoring all sensor data to gain insights into the condition or behavior of the person in the cradle and to initiate appropriate actions. This artificial intelligence could, for example, be an artificial neural network that can be trained using information about the oscillation of the cradle as input data and the reactions of the person in the cradle as output data. The neural network can be individually trained for each user by being continuously retrained or untrained during use of the cradle system. Thus, the control of the cradle system can be individually tailored.

[0076] Thus, the control unit can use rule-based technology or artificial intelligence to determine the optimal parameters for automated operation, taking into account the prevailing boundary conditions, and control the unit accordingly. In a preferred embodiment, the automated operation optimizes the vibration intensity so that it uses only the minimum movement necessary to maintain restful sleep. For example, if restless behavior is detected in a child, the vibration intensity can be temporarily increased. Furthermore, a higher vibration intensity can be applied at the beginning of the movement period. For instance, the control unit can learn movement patterns that lead to particularly restful sleep for the child. The learned movement patterns can be differentiated for short sleep phases (naps) and long sleep phases (nighttime).The activity index mentioned above can provide a data basis for learning automated operation.

[0077] Automatic operation can reduce the potential for a child to become accustomed to the swinging motion. Furthermore, automatic operation can be started in a mode where the intensity of the movement is gradually reduced to help the child wean themselves off the swinging motion.

[0078] In addition, the control unit can send anonymized sensor data to a central internet service to query empirical data from installations of other spring cradle systems with similar sensor data, in order to accelerate its own learning (through more available training data).

[0079] According to another aspect of the present invention, a method for simulating an elastic tension element is provided, comprising the following steps: a) Providing a drive system comprising a tension element with a distal end designed to be attached to a vibration element, and a drive unit designed to increase and / or decrease a free length of the tension element to change a position of the vibration element relative to the drive system; b) Operating the drive unit so that a preload is applied to the tension element to simulate an elastic tension element; c) Determining that the distal end of the tension element does not move towards the drive unit; and d) Terminating the simulation of the elastic tension element.

[0080] Thus, a mechanical traction element can be dispensed with, since the inventive method allows such a traction element to be simulated by selectively controlling the drive unit. Therefore, the method achieves the same advantages as the device described above and results in a particularly quiet and efficient operation of a spring cradle.

[0081] Preferably the procedure further comprises the following steps: e) Operating the drive unit to initiate an oscillating motion of the oscillating element so that the distal end of the tension element moves away from the drive unit, f) Determining that the distal end of the tension element no longer moves away from the drive unit, and g) Operating the drive unit so that the preload is applied to the tension element to simulate an elastic tension element.

[0082] All the advantages of the method also apply analogously to the device and vice versa. Furthermore, individual aspects of one embodiment can be combined with other aspects of other embodiments to form new embodiments.

[0083] In the following, embodiments of the present invention are described in detail with reference to the accompanying drawings. Fig. 1 a schematic representation of a drive system according to an embodiment of the present invention in use with a spring cradle system, Fig. 2 a schematic representation of a drive system according to a further embodiment of the present invention in use with a spring cradle system, Fig. 3 a schematic representation of a drive system according to a further embodiment of the present invention in use with a spring cradle system, Fig. 4 a schematic representation of a drive system according to a further embodiment of the present invention in use with a spring cradle system, Fig. 5 a schematic representation of a drive system according to a further embodiment of the present invention in use with a spring cradle system, Fig. 6 a schematic representation of a drive system according to a further embodiment of the present invention in use with a spring cradle system, Fig. 7 a schematic representation of a drive system according to a further embodiment of the present invention in use with a spring cradle system, and Fig. 8 a schematic representation of a spring cradle system according to an embodiment of the present invention.

[0084] Fig. 1 Figure 1 is a schematic representation of a spring cradle system 100. The spring cradle system comprises a drive system 2 according to a further embodiment of the present invention. In the present embodiment, the spring cradle system 100 can be suspended in a fixed position by means of a mounting 1. Thus, the spring cradle system 100 can, for example, be suspended from a hook on a ceiling, a door frame, and / or a rack. The drive system 2 is connected to the mounting 1 in such a way that, in the operating state, the drive system 2 hangs below the mounting 1. The spring cradle system 100 further comprises a tension element 4 and a restoring element 3. The restoring element is located in the Fig. 1 In the illustrated embodiment, the spring is used. In another embodiment not shown, the restoring element is an elastic element comprising a stretchable material (such as rubber or elastomer) and capable of elastically varying its length. The tension element and the elastic element 3 are both attached to the drive system 2, so that they hang below the drive system 2 during operation. A suspension element 5, which serves as part of the oscillating element, is attached to the tension element 4 and the elastic element 3. A stretcher or cradle 6, in which a person (e.g., a baby or child) can be placed, is arranged (e.g., suspended) from the suspension element 5. Thus, the stretcher 6 and the suspension element 5 together form the oscillating element.

[0085] The traction element 4 can be separated from a drive unit 21 included in the drive system 2 (see Fig. 2 ) are shortened so that the distance between the oscillating element and the drive system 2 is reduced. In the present embodiment, the tension element is mounted on a roller 7 (not in Fig. 1 The tension element 4 is rolled up and down to vary the distance between the drive system 2 and the oscillating element. By subsequently releasing the tension element 4, the oscillating element can move away from the drive system 2 again due to gravity. During this movement, the tension element 4 exerts no force on the oscillating element. The elastic element 3 deforms elastically, thereby braking the movement of the oscillating element until it comes to a standstill. Subsequently, the elastic element 3 exerts a force on the oscillating element in the opposite direction to its previous movement, causing the oscillating element to move back towards the drive system 2. During this return movement, the tension element 4 exerts no force on the oscillating element. Thus, an oscillation of the oscillating element can be initiated.

[0086] To maintain the oscillation by periodically tightening the tension element 4, the tension element 4 must always be kept under tension. In other words, the tension element 4 should not sag, so that the oscillating element can be directly tightened by coiling the tension element 4. In the prior art, a tensioned tension element is provided by a mechanical tensioning element. This mechanical tensioning element is usually a coil spring on a shaft of the drive unit 21. In the present invention, this mechanical tensioning element is simulated by selectively operating the drive unit 21. Thus, during an upward movement of the oscillating element (i.e., during movement towards the drive system 2), the free length of the tension element 4 is shortened so that the tension element is always under tension between the drive system and the oscillating element.This ensures that the movement of the vibrating element can be directly influenced when the drive unit is operated. In this way, even complex vibration patterns can be achieved through targeted operation of the drive unit 21. Similarly, a harmonic vibration, which can be maintained at a constant level, for example, can also be provided.

[0087] Fig. 2 Figure 1 is a schematic representation of the spring cradle system 100 according to a further embodiment of the present invention. In contrast to Fig. 1 is in Fig. 2 A housing 9 of the drive system is cut away so that the elements shown in the drive system 2 are visible. For example, the roller 7, which can be driven by the drive unit 21 and around which the tension element 4 can be wound and unwound, is shown. In addition, a motion sensor 8 is arranged in the housing 9 of the drive system in the present embodiment. The motion sensor 8 is designed to detect movement of the tension element 4. The motion sensor 8 can detect the magnitude and direction of movement. Thus, a control unit 22, which is also arranged in the drive system, can determine the position of the oscillating element relative to the drive system 2. Consequently, the drive unit 21 can be controlled with high precision in order to realize predetermined oscillation patterns and to keep the tension element 4 under constant tension.In the present embodiment, the pulling element 4 is guided through the sensor 8. The sensor can, for example, be equipped with two measuring rollers between which the pulling element is clamped. The rotation of these measuring rollers allows the sensor to detect movement of the pulling element 4.

[0088] Fig. 3 Figure 1 is a schematic representation of the spring cradle system 100 according to a further embodiment of the present invention. The figure shown in Figure 1 is a schematic representation of the spring cradle system 100 according to a further embodiment of the present invention. Fig. 3 The embodiment shown corresponds to the one in Fig. 2 The embodiment shown differs from the one described above, with the difference that the motion sensor 8 in the present embodiment is a non-mechanical sensor. In other words, the sensor 8 can be an optical or an electromagnetic sensor. Therefore, the operation of the drive system 2 can be particularly quiet and with minimal wear. Here, the sensor 8 can, for example, be directed at a pole wheel 12 that is mounted on the shaft of the drive unit 21. The pole wheel 12 can have regular recesses that can be detected by the sensor 8. Furthermore, the pole wheel can have magnetized elements that can be detected by the sensor 8. In this case, the sensor 8 can be a Hall sensor.

[0089] Fig. 4 Figure 1 is a schematic representation of the spring cradle system 100 according to a further embodiment of the present invention. In this embodiment, additionally or alternatively to the sensors of the embodiments described above, further sensors 14 are provided for recording information about a person placed in the stretcher. The sensors 14 can, for example, include a vibration sensor. This allows movement of the person in the stretcher 6 to be detected. In particular, due to the tensioned connection between the drive system 2 and the oscillation system provided by the tension element 4, movements of the person in the stretcher 6 can be transmitted to the drive system 2. The control unit 22 can then adjust the operation of the drive unit 21 to the detected vibrations.For example, if sensors 14 detect restless behavior in a child in carrier 6, the vibration intensity can be increased or decreased. This is based on the assumption, observed in practice, that children fall asleep more easily with a higher vibration amplitude. Furthermore, if sensors 14 detect restless behavior, a notification can be sent, for example, as a push notification to a smartphone.

[0090] Fig. 5 Figure 1 is a schematic representation of the spring cradle system 100 according to a further embodiment of the present invention. The present embodiment differs from the previous embodiments in that no elastic element is provided; instead, the oscillating element is connected to the drive system 2 solely by means of a tension element 4. Furthermore, the drive system 2 has a roller 15 with a guide 16 for the tension element 4. In other words, the tension element 4 is wound onto the roller 15 in a controlled manner by the guide 16. Thus, a constant force can always be applied from the roller 15 to the tension element 4 and vice versa. As in the embodiments above, the roller 15 is driven by a drive unit (not shown in Figure 1). Fig. 5 The drive system 2 is driven by a force of gravity. Furthermore, a recuperation device 18 is provided in the drive system 2 and connected to the shaft on which the roller 15 is arranged. Thus, when the oscillating element moves away from the drive system 2 (i.e., driven by gravity), energy can be recovered from the movement of the oscillating system. A motion sensor 8 in the form of a dynamo is also connected to the shaft. This allows the position of the oscillating element relative to the drive system to be reliably determined. In addition, this embodiment has a mechanical locking element 17 designed to hold the tension element 4 when, for example, no movement of the oscillating element is desired.

[0091] Fig. 6 Figure 1 is a schematic representation of the spring cradle system 100 according to a further embodiment of the present invention. This embodiment corresponds to the one described in Figure 1. Fig. 2 bis 4 The illustrated embodiments differ in that the motion sensor is directed straight at the traction element 4 and can register any movement of the traction element 4. In this case, the sensor is an ultrasonic sensor. Like the optical sensors mentioned above, this non-mechanical sensor has the advantage that the operation of the drive system 2 is very quiet and low-wear.

[0092] Fig. 7 Figure 1 is a schematic representation of the spring cradle system 100 according to a further embodiment of the present invention. This embodiment corresponds to the one described in Figure 1. Fig. 2 bis 4 and 6 The illustrated embodiments differ in that the motion sensor is designed as a dynamo located on the same shaft as the roller 7 and the drive unit 21. Consequently, movements of the roller 7, and thus of the traction element, can be easily detected.

[0093] Fig. 8 Figure 1 is a schematic representation of a spring cradle system according to an embodiment of the present invention. The traction element 4 is deflected by means of two pulleys, such that the traction element 4 runs at an angle of approximately 45° relative to the horizontal from the drive system 2 to the suspension element 5. Furthermore, the stretcher 6 of the present embodiment has an inclination sensor. Thus, the control unit 22 can acquire information about the position of the stretcher 6 and control the drive unit 21 based on this information. The pulleys are mounted on a frame on which at least the oscillating element is suspended. Thus, an oscillating movement can be initiated by actuating the traction element 4. Bezugszeichenliste

[0094] 1 Mounting 2 Drive system 3 Restoring element 4 Pulling element 5 Suspension element 6 Support 7 Roller 8 Motion sensor 9 Housing 12 Pole wheel 14 Vibration sensor 15 Roller with guided track 16 Guide for pulling element 17 Mechanical lock 18 Recuperation device 21 Drive unit 22 Control unit 100 Spring cradle system

Claims

1. Drive system (2) for a spring cradle system (100), in particular for a children's or baby spring cradle, for generating an oscillating motion, comprising: a tension element (4) having a distal end designed to be attached to an oscillating element, a drive unit (21) designed to increase and decrease a free length of the tension element (4) in order to change a position of the oscillating element relative to the drive system (2), wherein the drive unit (21) is an electric motor and comprises a rotatable shaft about which the tension element (4) can be wound by rotation, and a control unit (22) designed to control the drive unit (21) such that a preload force acts on the tension element (4) regardless of the position of the oscillating element relative to the drive system (2), whereby a tensile force is transmitted through the tension element toward the drive system, wherein the tension element is a rope, and wherein the tensile force is a preload force.

2. Drive system (2) according to claim 1, further comprising at least one sensor (8) for determining a displacement of the distal end of the tension element (4), wherein the at least one sensor (8) is preferably a non-contact sensor.

3. Drive system (2) according to any one of the preceding claims, wherein the drive unit (21) is designed to apply a variable force to the tension element (4).

4. Drive system (2) according to any one of the preceding claims, wherein the drive system (2) has an energy storage device designed to supply energy to the drive unit (21) and the control unit (22).

5. Drive system (2) according to any one of the preceding claims, wherein the preload force is less than 15% of the maximum power of the drive unit (21), preferably less than 10% of the maximum power of the drive unit (21), and more preferably less than 8% of the maximum power of the drive unit (21).

6. Drive system (2) according to any one of the preceding claims, wherein the control unit (22) is further designed to control the drive unit (21) such that the oscillating element performs a predetermined oscillatory motion.

7. Drive system (2) according to any one of the preceding claims, wherein the drive system (2) comprises at least one resilient element (3) that connects the drive system (2) to the oscillating element.

8. Drive system (2) according to claim 7, wherein the control unit (22) is designed to detect characteristics of the resilient element (3) and to control the drive unit (21) based thereon.

9. Drive system (2) according to any one of the preceding claims, wherein the drive system (2) comprises a recuperation device (18) designed to recover energy from the oscillatory motion of the oscillating element.

10. Drive system (2) according to any one of the preceding claims, wherein the tension element (4) is provided on the drive system (2) such that it extends away from a central point of the drive unit (21).

11. Drive system (2) according to any one of the preceding claims, wherein the drive system (2) further comprises an electronic shut-off device, wherein the control unit (22) is designed to periodically send operating signals to the shut-off device, and wherein the shut-off device is designed to automatically interrupt the power supply to the drive unit (21) when it does not receive operating signals.

12. Spring cradle system (100) comprising: a drive system (2) according to any one of the preceding claims, which can be arranged in a stationary manner, and an oscillating element designed to accommodate at least one person, wherein the oscillating element is attached to or can be attached to the tension element (2).

13. Spring cradle system (100) according to claim 12, further comprising at least one sensor (14) designed to detect a condition of the at least one person accommodated in the oscillating element, wherein the control unit (22) is designed to control the drive unit (21) based on the detected condition and / or to output the condition of the at least one person to an output unit.

14. Method for simulating an elastic tension element, comprising the following steps: a) providing a drive system (2) comprising a tension element (4) with a distal end designed to be attached to an oscillating element, and a drive unit (21) designed to increase and / or decrease a free length of the tension element (4) in order to change a position of the oscillating element relative to the drive system (2), wherein the drive unit (21) is an electric motor and comprises a rotatable shaft onto which the tension element can be wound by rotation, b) operating the drive unit (21) so that a preload is applied to the tension element (4), thereby transmitting a tensile force through the tension element in the direction of the drive system to simulate an elastic tension element, c) determining that the distal end of the tension element (4) is not moving toward the drive unit (21), and d) terminating the simulation of the elastic tension element, wherein the tension element is a rope, wherein the tensile force is a preload force.

15. Method according to claim 14, wherein the method further comprises the following steps: e) operating the drive unit (21) to initiate an oscillating motion of the oscillating element, such that the distal end of the tension element (4) moves away from the drive unit (21), f) determining that the distal end of the tension element (4) is no longer moving away from the drive unit (21), and g) operating the drive unit (21) so that the preload is applied to the tension element (4) to simulate an elastic tension element.