Pram, frame and method for automatic rocking

Abstract

A stroller comprising a frame (10) having a pusher (11) and wheels (12) for driving the stroller, a drive (13) drivingly connected to at least one of the wheels (12), and a braking device (14) for at least one wheel (12) which can be switched between a driving state with free rotation of the wheel and a braked state with at least one braked wheel (12), the drive (13) being operable for an automatic rocking function of the stroller, wherein the wheel (12) braked by the braking device (14) for automatic rocking of the stroller can rotate to a limited extent in both circumferential directions in the braked state.

Description

Detailed Description of the Invention

[0001] [explanation] The present invention relates to a baby carriage, a frame for a baby carriage and a method for automatic rocking. A baby carriage with the features of the preamble of claim 1 is known, for example, from DE 10 2008 039 599 A1.

[0002] Known baby carriages are provided with drives which can be switched on for short-term assistance of the push drive, for the rocking function and for raising and lowering the seat or berth, whereby the mechanism is described in terms of changing the height position of the seat or berth, which are attached via fastening belts to the upper parts of two telescopic, spindle-operated arms which are connected in their upper parts to the chassis of the baby carriage.

[0003] EP 2 818 382 A1 discloses a further motor-driven pram equipped with a drive for assisting the pushing movement of the pram. EP 2 818 382 A1 focuses on the control of the drive in relation to the pushing force. Figure 1 (Prior Art) shows the structure of the pram known from EP 2 818 382 A1, which comprises a frame provided with wheels, a pram attachment connected to the frame and a pusher for the pushing movement of the pram. The drive in the lower area of ​​the frame of the known pram is shown diagrammatically.

[0004] It is known from the above mentioned general prior art that the drive provided for assisting the pushing action can also be used for automatically rocking the pram. However, when using motor-assisted automatic rocking, it is not only important that such a rocking movement is generated, but also that said rocking movement is safe to handle and that it soothes or even rocks to sleep a child lying in the pram attachment.

[0005] The object of the present invention is to improve the above-mentioned known baby carriage in such a way that an automatic rocking function that is as safe and practical as possible is implemented with the aid of a drive device, which drive device allows the desired rocking movement of the baby carriage without manual assistance. A further object of the present invention is to provide a corresponding frame for a baby carriage, as well as a corresponding method for automatically rocking the baby carriage.

[0006] According to the invention, this object is achieved with respect to the pram by the subject matter of claim 1. With respect to the frame, this object is achieved by the subject matter of claim 16 and with respect to the method by the subject matter of claim 17.

[0007] In particular, this object is achieved by a baby carriage comprising a frame with wheels and a pusher for driving the baby carriage. The baby carriage comprises a drive drivingly connected to at least one of the wheels and a braking device for at least one wheel. The braking device is transferable into a driving state in which the wheels are free to rotate and into a braked state with at least one braked wheel (possibly several braked wheels). The drive can be activated for an automatic rocking function of the baby carriage. For automatic rocking, the (respective) wheel braked by the braking device is able to rotate to a limited extent in both circumferential directions in the braked state.

[0008] The invention has the advantage that the rocking motion, which is typical in practice for soothing a child, can be simulated by gently moving the stroller forwards and backwards. This is achieved by a braking device which allows a partial rotation of the wheels in the braked state. This partial rotation has the effect that the stroller can only move a limited distance. For this purpose, the wheels braked by the braking device can rotate to a limited extent in both circumferential directions in the braked state. By limiting the rotational movement of the wheels, a moving frame is created in the braked state, which can be used by the drive of the stroller for the rocking movement. In this way, the partial rotation of the braked wheels is limited in both circumferential directions. This allows the simulation of a repetitive back and forth forward movement of the stroller, which is typical in practice. At the same time, the safety of the rocking movement is guaranteed, since the braking device is in the braked state during automatic rocking and prevents free and unbraked wheel rotation.

[0009] The free rotation of the wheels corresponds to a driven state in which the braking device is fully released so that the wheels can rotate freely. In contrast, in the braked state, only partial rotation of the wheels is possible, which allows a limited forward and backward movement of the stroller, which is required for the rocking movement. The repetitive braking of the stroller caused by muscle forces during manual rocking is replaced by the braking device. The invention thus provides the prerequisites for a motor-assisted automatic rocking movement that is natural and oriented towards the manual rocking movement.

[0010] The present invention is applicable to all types of baby carriages that allow rocking by moving the baby carriage back and forth. For example, the present invention can be applied to a traditional baby carriage (prior art) as shown in Figure 1, a child stroller, a buggy or similar vehicle that serves to transport babies and small children.

[0011] Thus, the pram preferably has at least three wheels, in particular at least two, preferably exactly two, rear wheels and at least one front wheel, preferably exactly one front wheel or exactly two front wheels. The braking device is capable of allowing (driving state) or preventing (braked state) the rotation of at least one of the wheels, preferably one rear wheel or both rear wheels. Preferably (at least) clearly, at least one wheel (each) which can also be engaged by the braking device is driven.

[0012] According to an embodiment, the frame may be, although the list is not exhaustive, - at least one hind leg, preferably two hind legs, at least one front leg, preferably exactly one or exactly two front legs, - a mounting unit for carrying a child and / or at least one adapter allowing a detachable attachment of the mounting unit for carrying a child, - the axle connecting the (two) rear wheels, and / or a joint for rotatably connecting at least two frame sections of a frame, preferably at least one, preferably at least two and / or all of the frame sections connected by said joint - Pusher, - at least one hind leg, - at least one front leg; Selected from, fittings, It may also have

[0013] The invention does not (necessarily) depend on the exact configuration of the drive. This means that the change in direction of the force or torque required to reverse the motion can be achieved in different ways. The invention provides a configuration to ensure that the motor-driven motion cannot occur in an uncontrollable manner in one of the two directions of travel, or in both directions of travel. According to the invention, the oscillating motion is limited, at least mainly, by the braking device and not by the drive.

[0014] Preferred embodiments of the invention are set out in the dependent claims.

[0015] The braking device may comprise a parking brake, which, in contrast to a deceleration brake, completely blocks the braked wheels. This has the advantage that a desired partial rotation is allowed in the braked state between two blocking positions of the wheels. This provides optimal safety against unintended movements of the stroller during automatic rocking.

[0016] In a further preferred embodiment, the braking device can have several braking positions at different wheel angle positions, each of which allows a limited rotation of the braked wheel in both circumferential directions, which has the advantage that the automatic rocking function is possible in (almost) any wheel position, just like with the classical manual rocking.

[0017] The braking device and the (respective) wheel preferably have at least one (possibly two) pair of complementary (contacting in at least one state) stops (movement stops; stop surfaces) for (mechanically) limiting the rotation of the wheel. The (respective) pair can be formed by two engagement projections (whereby at least one engagement projection can be formed by a pin) and / or by an engagement projection (possibly a pin) and an engagement opening (possibly extending along an arc, preferably a circular arc), for example an engagement opening (in particular an engagement through hole) or an engagement recess (in particular an engagement blind hole). Advantageously, the braking device has at least or exactly one engagement means (e.g. an engagement projection) and / or at least or exactly one engagement recess (in particular an engagement opening), which interacts with a corresponding engagement recess (in particular an engagement opening) or a corresponding engagement means (e.g. an engagement projection) of the respective wheel for braking. This allows the braking device to be reverted to a standard part for braking function, which can be relatively easily modified for partial rotation. For kinematic reversal, the (respective) engagement means (e.g. engagement protrusion) and / or the (respective) engagement recess (in particular engagement opening) can be formed on the braking device. Conversely, the wheel can have at least or exactly one engagement opening and / or at least or exactly one engagement means (e.g. engagement protrusion) (formed in a corresponding manner and complementary). Typically, the wheel has at least one (possibly exactly one) engagement opening and the braking device has (at least one) complementary engagement means.

[0018] Preferably, the inner circumference and / or length (extending in the circumferential direction of the wheel) of the (respective) engagement recess (in particular the engagement opening) is greater than the outer circumference or length (extending in the circumferential direction of the wheel) of the engagement means (engagement protrusion), in order to create play in the circumferential direction of the wheel. In this embodiment, the play or braking play allows partial rotation and thus the linear movement of the pram required for rocking.

[0019] Preferably, the radial extension of the (each) engagement recess (especially the engagement opening) is equal to or greater than the outer periphery or length (extending in the wheel circumferential direction) of the engagement means (engagement protrusion) to create play in the wheel circumferential direction.

[0020] In a specific embodiment, the engagement means can comprise a pin and / or a stud and / or the engagement opening can comprise a corresponding pin or stud outlet, whereby the pin outlet has a length greater than the diameter of the pin. Here too, standard parts can be used, which can be modified by relatively simple manufacturing means to achieve the desired brake play. The pin outlet can extend longitudinally along a partial circumference of the wheel. This has the advantage that in the braked state, the pin runs or is guided in the pin outlet as if in a curved guide groove, the end of which forms a movement stop, i.e. the limit of play. Several pin outlets can be arranged and distributed around the circumference, allowing several engagement or braking positions.

[0021] For each braked wheel, there may be (exactly) one engagement means (in particular an engagement protrusion, e.g. a pin) and / or a plurality (e.g. at least 3 or at least 8 and / or up to 30 or up to 18) engagement recesses (in particular engagement openings).

[0022] For each braked wheel there may be N (N ≥ 1) engagement means (in particular engagement protrusions, e.g. pins) and a number M of engagement recesses (in particular engagement openings), where preferably M > 2*N; optionally M > 5*N or M > 10*N; and / or M < 30*N apply.

[0023] In an embodiment, (at least) one specific engagement means (in particular an engagement protrusion, e.g. a pin) can be engaged with at least three or at least eight and / or up to 30 different engagement recesses (in particular engagement openings) (in particular in corresponding different envisaged states, whereby in each envisaged state the engagement means (in particular an engagement protrusion, e.g. a pin) is engaged with only one engagement recess (in particular engagement opening)).

[0024] The drive may comprise at least one motor, in particular an electric motor, at least one energy source, in particular a battery or accumulator, and at least one sensor and / or control unit. The motor may be arranged on the rear axle of the frame or may be designed as a hub motor. Advantageously, the drive, or in particular a part of the drive comprising the motor and / or the accumulator, is designed as a removable module. Such a removable module may also comprise other components, such as wheels, of the stroller or of the frame.

[0025] The provided sensor(s) may detect or measure the rotation or rotation angle of a wheel, in particular a braked wheel. Alternatively or additionally, the provided sensor(s) may detect whether the brake is activated. Alternatively or additionally, the provided sensor(s) may detect or measure the motor movement, in particular the rotation of an electric motor.

[0026] In a preferred embodiment, the control unit is designed for the analysis of the detected data and for the control of the motor. The configuration of the control unit according to the embodiment disclosed and claimed in relation to the baby carriage as part of the device is additionally described and claimed as a method for automatic rocking. Advantages and details according to the embodiment of the control unit are disclosed and explained in relation to the method claims. What is stated in the context of the method claims equally applies to the configuration of the control unit and is therefore also disclosed and claimed in relation to the control unit, i.e. in the context of the device.

[0027] Alternatively or additionally to the pram, a frame, in particular a chassis for a pram (possibly without an attachment for a child to lie and / or sit on, which attachment can be provided separately if required), is disclosed and claimed, which frame otherwise has the same features according to the invention as in claim 1. Regarding advantages, reference is therefore made to the description of the pram.

[0028] A method according to the invention for automatically rocking a baby carriage with rocking function comprises: - the braked state of the pram is detected; - when the rocking function is activated, the rocking distance of the stroller is automatically moved back and forth by the drive device; and - the start and end of the swing distance are each limited by the blocking of at least one wheel; It is characterized by:

[0029] The invention according to the invention is preferably, but not exclusively, applicable to a pram according to claim 1. The advantage of the method according to the invention is that an increased safety against unintended movements of the pram during automatic rocking is obtained, since the braking function is above the rocking function and is expanded but not cancelled by an increase in the circumferential play of the wheels. This is achieved in that the start and end of each rocking distance is delimited by the blocking of at least one wheel. Further functional features of the pram or frame mentioned above and below can be implemented as specific method steps.

[0030] In a particularly preferred embodiment of the invention, the power of the drive is increased after the beginning of the rocking distance and reduced before the end of the rocking distance, thereby achieving smooth starting and braking of the stroller and avoiding jerky movements. The associated speed profile during rocking is particularly similar to the manual rocking movement. The power of the drive can be reduced after 20% to 80%, in particular after 30% to 60%, for example after approximately 50% of the rocking distance.

[0031] If the output of the drive is reduced to zero after reaching the end of the swing distance after the hold time, the drive, and in particular its motor, is allowed to safely idle before reversing direction, which is particularly noticeable when using electric motors.

[0032] Safety during automatic rocking is further increased by the fact that the drive is switched off when the stroller exceeds a maximum rocking distance, which at least essentially corresponds to a typical driving distance when the stroller is moved back and forth by manual force. The maximum rocking distance is determined by the blocking of at least one wheel at the start and end of the rocking distance. In addition to the safety provided by the limitation of the drive movement by the braking device, the output of the drive is switched off if it is detected that the maximum rocking distance (either by itself or by at least a predefined percentage of the rocking distance, e.g. 5%-50%) has been exceeded.

[0033] Preferably, as the swing distance progresses, the output of the drive is varied back and forth so that the same or similar velocity profile is established in both drive directions during the swing.

[0034] In a further embodiment of the method, the length of the rocking distance can be adjusted or set to different sizes (so that the maximum value can correspond, for example, to at least twice or at least five times the minimum value). The length of the rocking distance can also be automatically set to a shorter or longer rocking distance during the rocking period. From practical experience, it is known that people sometimes push the pram back and forth for shorter or longer periods in order to calm the child, even during the rocking phase.

[0035] The above-mentioned features of preferred embodiments of the method according to the invention can also be implemented by means of a corresponding configuration of a control unit in an embodiment of the pram according to the invention. In this respect, the above-mentioned method features are likewise disclosed and claimed in relation to a control unit configured in a corresponding manner.

[0036] Thereby, the adaptability of the control unit to perform the desired functions is claimed. For example, the control unit is configured in such a way that the length of the swing distance is adjustable or can be adjusted to different sizes. The length of the swing distance can be automatically set to a shorter or longer swing distance during the swing period. The same applies to other process features.

[0037] The parameters of the control of the wobble function described below may be adjustable and / or configurable to different sizes.

[0038] According to an embodiment, various parameters may be defined to control the rocking function, in particular: a predefined percentage of the swing distance, whereby the predefined percentage of the swing distance may be between 20% and 80%, in particular between 30% and 60%, for example approximately 50%, of the swing distance, and / or - a reduced motor power, which may be less than 30% of the maximum motor power, preferably less than 20%, for example 5% to 15% of the maximum motor power; can be defined.

[0039] The frequency at which the sensors operate may be between 10 Hz and 200 Hz, preferably between 20 Hz and 100 Hz, for example 50 Hz. This means that each sensor detects a new value every 5 ms to 100 ms, preferably every 10 ms to 50 ms, for example every 20 ms. It may be provided that different sensors operate at different frequencies.

[0040] It can be provided that the rocking function can be operated in different modes, whereby the modes can differ, for example, by the frequency of the rocking function. In particular, the different modes can be assigned different increases in power after the start of the rocking distance and / or different predefined percentages of the rocking distance, whereby the power of the drive device is reduced after reaching the different predefined percentages. In particular, two to five, for example three, different modes can be provided.

[0041] It may be provided that the motor power is increased continuously (possibly linearly) after the start of the swing distance until a predefined percentage of the swing distance has been traveled. It may also be provided that the motor power is suddenly limited to a reduced motor power when a predefined percentage of the swing distance has been traveled. It may also be provided that the reduced motor power is maintained at a constant level until the end of the swing distance.

[0042] The motor power available for the sway function may be limited to a pre-defined percentage of the maximum motor power, preferably more than 50% of the maximum motor power, for example 70%-80% of the maximum motor power. It may be defined to provide only a reduced motor power when the motor power available for the sway function is reached or exceeded, even if the pre-defined percentage of the distance has not yet been travelled.

[0043] The length of the swing distance may be less than 20 cm, preferably less than 10 cm. Additionally or alternatively, the length of the swing distance may be greater than 0.5 cm, preferably greater than 1 cm. Specifically, the length of the swing distance may range between 2 cm and 7 cm.

[0044] The rotation of a wheel braked by the braking device may be limited to a maximum of 90° or a maximum of 50°, preferably a maximum of 30°. It may be stipulated that for a wheel braked by the braking device, a rotation of at least 1° or at least 2°, preferably at least 4°, is possible.

[0045] It may be specified that reduced motor power is provided until the sensor detects (after progressing a predefined percentage of the swing distance) that there is no motor motion (possibly no motor motion whatsoever occurring for a predefined time, e.g. 50 ms to 250 ms, whereby the predefined time may correspond to a hold time).

[0046] The duration of a full cycle (ie, two passes over the oscillation distance, one "forward pass" and one "backward pass") may be in the range between 0.2 and 10 seconds, preferably between 0.5 and 5 seconds.

[0047] It may be possible for the user to switch the rocking function on and off directly on the motor and to set the rocking function if required, but preferably this is possible via an operating unit provided on the slide and / or via an application. For this purpose a wired and / or, in particular a wireless connection, may be provided.

[0048] The invention will now be explained in more detail by way of an example of an embodiment with reference to the attached schematic drawings which provide further details. [Brief description of the drawings]

[0049] In these, the following is shown:

[0050] [Figure 1] An example of a stroller construction with a drive for assisting the pushing action according to the prior art [Diagram 2] FIG. 1 shows a top view of a braked wheel of a stroller with a braking device in a first position according to an example embodiment according to the present invention; [Diagram 3] The braking device according to FIG. 2 in a second position [Figure 4] FIG. 1 shows the power curve of the drive in relation to the wheel position of a stroller according to an example embodiment according to the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0051] 1 shows a pram according to the prior art with a drive 13, which is arranged in the lower area of ​​the frame 10 of the pram. The present invention is applicable to such prams and allows the implementation of an automatic rocking function using the drive 13, which is additionally provided on the known pram and which complements the function of the pushing action. The basic construction of the pram according to an example embodiment according to the present invention is explained with reference to the known pram, which otherwise does not show a rocking function together with an extended braking function.

[0052] The invention, or an example of an embodiment according to the invention, uses a drive 13 which is provided to additionally supplement the function of the pushing action to realize the automatic rocking function. Instead of this dual function of the drive 13, a separate drive for the rocking function can be provided. In contrast, the dual function has the advantage that the stroller is constructed compactly and lightly due to the reduced number of drives 13. The drive 13 can be activated accordingly for the automatic rocking function of the stroller. The activation of the drive 13 can be performed by a corresponding control unit. In both cases, the drive 13 is designed in such a way that, when the drive 13 is activated, the rocking function occurs automatically, i.e. without manual intervention. For this purpose, the drive 13 allows an automatic reversal of the direction of travel, as when rocking the stroller by application of a manual force.

[0053] In the pram according to Fig. 1 the drive 13 comprises a hub motor drivingly connected to at least one of the rear wheels 12. Other motors and motor arrangements are possible. The frame 10 comprises a pusher 11 with a handle and wheels 12 which are rotatably connected to the frame 10. Here too different designs of the frame 10 are possible, for example with three or four wheels. The invention is not limited to a specific configuration of the frame 10.

[0054] The drive 13 comprises a motor 17, for example an electric motor, an energy source such as a battery or accumulator, and one or more detection units (sensors) and / or a control device. In FIG. 1 the energy source, the sensor or the control device are not shown. The sensor may be designed to detect the rotation of at least one braked wheel 12, in particular to measure the angle of rotation of the braked wheel 12. Preferably, the sensor is additionally capable of detecting the rotation of the motor 17. With the help of a further sensor it can be monitored whether the braking device 14, in particular the parking brake, is activated. This serves a safety purpose, since in case the parking brake is not activated the rocking function is prevented. Alternatively or additionally to this safety, the speed of the pram or other corresponding parameters can be measured in order to prevent the rocking function being triggered when the pram is driven.

[0055] For mounting the baby or toddler a mounting unit 18 is used, which is connected to the frame 10, for example by means of an adapter, or is permanently connected. The mounting unit 18 is preferably designed as a reclining unit, in particular as a portable sleeper and / or child carrier. A seat attachment, which can be moved to a reclined position when required, is also possible.

[0056] The control unit, not shown in Fig. 1, is designed for the analysis of the data detected by the sensors and for the control of the drive unit 13, in particular the motor 17, on the basis of this. Also not shown in Fig. 1, but shown in Figs. 2 and 3, is the braking device 14, which can be put into a driving state and into a braked state. In the driving state, the braking device 14 is released to allow the wheels to rotate freely so that the stroller can be pushed unhindered. In the braked state of the braking device 14, at least one wheel 12 is braked. Preferably, the braking device 14 and the drive 13 act on one and the same wheel 12. The braking device 14 of the stroller has sufficient play so that a linear or forward-backward movement of the stroller is possible, which essentially corresponds to a manual rocking movement. For this purpose, the wheel 12 braked by the braking device 14 can rotate to a limited extent in both circumferential directions in the braked state.

[0057] 2 and 3 show an example of an embodiment of a baby carriage according to the invention or a frame for a baby carriage according to the invention, in which the braking device 14 is constructed in such a way that rotation of the wheels, in particular the driven wheels 12, is permitted to a limited extent in the braked state (partial rotation). For this purpose, the braking device 14 has engagement means 15, which in the example of the embodiment according to FIG. 2 are designed as studs or pins 15. The pins 15 extend parallel to the hub axis of the wheels 12 and project outwards in relation to the frame 10 in order to be able to interact with complementary engagement openings 16 in the wheels 12. The engagement openings 16 are designed as pin sockets for the pins 15.

[0058] The braking device 14 is thus a parking brake because the pins 15 in the pin receptacles or engagement openings 16 prevent the wheels 12 from rotating.

[0059] A comparison of figures 2 and 3 shows that the pin 15 assumes different positions relative to the wheels 12 or the engagement openings 16. The different positions of the pin 15 illustrate the braking play of the braking device 4, which in the example embodiment according to figures 2 and 3 is used to implement a motor-driven automatic rocking function of the pram.

[0060] In Fig. 2, the pin 5 is in a lower position and abuts against a first inner side of the engagement opening 16, which prevents the wheel 12 from rotating in a clockwise direction (in the view shown in Fig. 2). Fig. 3 shows the pin 15 in an upper position in the engagement opening 16, where it abuts against a second inner side of the engagement opening 16, which prevents the wheel 16 from moving in a counterclockwise direction. The first and second inner sides of the engagement opening 16 are arranged opposite each other in the circumferential direction of the wheel 12, so that between these two inner sides a sufficiently large free space of the engagement opening 16 is formed, in which the pin 15 can perform the desired partial rotation relative to the wheel 12 or vice versa.

[0061] In other words, the circumferential extension of the engagement opening 16 is greater than the diameter of the pin 15. The first and second inner sides of the engagement opening 16, which determine the partial rotation of the wheel 12 in the braked state, are spaced apart from each other and allow the progression of the desired swing distance of the stroller for the swinging movement.

[0062] The width of the engagement opening 16 extends in the radial direction of the wheel 12. The width of the engagement opening 15 corresponds at least to the diameter of the pin 15 or is greater than the diameter of the pin 15.

[0063] According to an embodiment, the pin 15 may be capable of being moved to at least two positions in a direction perpendicular to the drawing plane of Figures 2 and 3: a first position in which the pin 15 engages one of the engagement openings 16, and a second, retracted position in which the pin 15 disengages from the engagement opening 16.

[0064] The shape of the engagement opening 16 is not limited to the configuration shown in Figures 2 and 3. Other shapes are possible.

[0065] 2 and 3 it is immediately visible that several engagement openings 16 are arranged around the circumference of the wheel and that the engagement openings 16 are designed identically so that there are various engagement possibilities for the pins 15. The rocking function is possible in any position because the brake play is matched or because the length of the engagement openings 16 is identical.

[0066] The operating mode of the example embodiment along the lines of Figures 2 and 3 is explained using the graph of Figure 4. Figure 4 illustrates the interaction of the drive 13 and the braking device 14.

[0067] The upper partial view of FIG. 4 exemplarily shows the power curve over time of the drive 13 or motor 17 in the braked state and during automatic rocking. The lower partial view of FIG. 4 shows the corresponding wheel positions of the wheel 12 in the braked state and during automatic rocking. The center of the two wheel positions corresponds to the maximum rocking distance, i.e. the linear movement of the stroller when moved forwards and backwards. The two maximum wheel positions are defined by the braking device 4 and these two maximum wheel positions define the start and end of the partial rotation of the wheel 12 shown in the lower partial view of FIG. 4. In the left-hand position of the wheel 12 in FIG. 4, the pin 15 according to FIG. 3 abuts against one inner surface of the engagement opening 16, thereby preventing further movement of the wheel 12 (rear end stop). The same applies to the other wheel position in FIG. 4 (front end stop), which is defined by the stop of the pin 15 on the other inner surface of the engagement opening 16.

[0068] The upper partial view in FIG. 4 shows the power curve of the drive 13 or motor 17, which determines the speed profile of the wheel movement. After the beginning of the swinging distance, the power first increases with a slope α to a maximum value Pmax, for example 70% of the total motor power. The maximum value Pmax is reached approximately halfway through the swinging distance, as can be seen from the comparison with the lower partial view along FIG. 4. Other times are possible. After reaching the maximum power Pmax, the power drops to a minimum value Pmin, for example 7% of the total motor power, which remains constant until the end of the swinging distance, whereby the swinging movement stalls gently due to the pin 15 butting against the inside of the engagement opening 16. The power is maintained at the minimum value Pmin during the hold time beyond the pin 15 butting against the inner surface of the engagement opening 16, in order to achieve that the motor 17 stops and then the reversal of the movement begins.

[0069] The time Tc between the start of the power increase and the end of the hold time defines the rocking phase, in the example according to FIG. 4 the forward movement of the stroller. The inclination α and the time Tc of the rocking phase together influence the rocking movement. The higher the inclination and the shorter the time Tc, the stronger the rocking movement. For the entire rocking process, after the end of the hold time, the direction of the force is reversed or the direction of rotation of the motor is changed, which results in a reciprocating movement, which results in a backward movement of the stroller. In this, the power of the motor passes through the same path as shown in FIG. 4, but in the opposite direction. The rocking movement is therefore determined overall, on the one hand, by the interaction of the braking device 4 in the braked state and, on the other hand, by the power curve over time of the drive 13 or the motor 17. On the one hand, by decoupling the deceleration by the braking device 4 and, on the other hand, by the movement of the wheels 16 by the drive 13, process control as well as safety during automatic oscillation is improved, since the motor 17 is run beyond the stop of the braking device 4 to achieve a safe reversal of the movement.

[0070] The method according to the illustrated exemplary embodiment comprises the following steps: 1. Switching on the rocking function (by a switch or via an application); 2. A step of detecting whether the parking brake is applied (if not: cancel); 3. applying a force to at least one wheel via a motor to increase (possibly linearly) the motor output; 4. Detecting (using a high enough frequency, e.g., 20Hz to 100Hz) how far the wheel has turned; 5. When a predefined desired percentage of rotation is reached (20% - 80%, preferably 30% - 60%, e.g. 50%), the motor power is reduced (to a predefined value, which can be less than 50%, preferably less than 30%, e.g. 7% or 15%, of the maximum motor power), 6. Maintaining the reduced motor power until the motor stops rotating (due to the pin hitting the end of the hole, according to the embodiment); 7. applying a force (in the opposite direction compared to 3.) to at least one wheel by the motor to increase (possibly linearly) the motor output; 8. After steps 4 to 6, continue with step 3. 9. Events from the following list: a. Switching the rocking function off; b. Parking brake is deactivated; c. the rotation exceeds a predetermined value, in particular more than 100% of a predefined rotation, for example 120% or 150%; d. the energy of the energy source drops to or below a predefined value; (not all of the stated revocation criteria need to be implemented), may include.

[0071] Depending on the embodiment, the motor output in 3. or 7. may be limited to a predefined value (in particular >50% of the maximum motor output and / or <90% of the maximum motor output), for example 60% to 80%, for example 70% or 75%.

[0072] According to an embodiment, the motor power reduced in 6. can still be maintained for a predefined time (holding time).

[0073] In this respect, it should be pointed out that all of the above-mentioned parts, particularly the details shown in the drawings, are claimed as essential to the invention both individually and in any combination, modifications of which are readily apparent to those skilled in the art.

[0074] It is further pointed out that the widest possible scope of protection is sought. In this respect, the disclosure contained in the claims can also be specified by features that are described with further features (even without these further features being necessarily included). It is expressly pointed out that parentheses and the term "in particular" are intended to emphasize the optionality of a feature in the respective context, and do not mean, conversely, that a feature should be considered as essential in the corresponding context without such recognition. [Explanation of symbols]

[0075] [Reference mark] 10...frame, 11...pusher, 12...wheel, 13...drive, 14...braking device, 15...engagement means, 16...engagement opening, 17...motor, 18...mounting unit.

Claims

1. The stroller comprises a frame (10) having a pusher (11) and wheels (12) for driving the stroller, a drive (13) drivingly connected to at least one of the wheels (12), and a braking device (14) for at least one wheel (12) that can be switched between a driving state with free rotation of the wheel and a braked state with at least one braked wheel (12), wherein the drive (13) is operable for an automatic rocking function of the stroller, The stroller is capable of rotating the wheels (12) braked by the braking device (14) to a limited extent in both circumferential directions in the braked state for automatic rocking of the stroller.

2. 2. The stroller of claim 1, wherein the braking device (14) comprises a parking brake.

3. 3. A stroller as claimed in claim 1 or 2, wherein the braking device (14) has several braking positions at different wheel angle positions, each of which allows limited rotation of the braked wheel (12) in both wheel circumferential directions.

4. 2. The stroller according to claim 1, wherein the braking device (14) has engagement means (15) and / or engagement recesses, in particular engagement openings (16), which interact with corresponding engagement openings (16) or corresponding engagement means (15) of the respective wheels (12) for braking.

5. 5. The stroller according to claim 4, wherein the inner periphery of the engagement recess is larger than the outer periphery of the engagement means (15) to provide play in the circumferential direction of the wheel.

6. 6. A stroller according to claim 4 or 5, wherein the engagement means (15) comprises a pin, the engagement recess comprises a corresponding pin socket, the pin socket having a length greater than the diameter of the pin.

7. 7. The stroller of claim 6, wherein the pin socket extends longitudinally along a partial circumference of the wheel.

8. 2. Pram according to claim 1, wherein the drive device (13) comprises at least one motor (17), at least one energy source and at least one sensor and / or control unit.

9. 9. Pram according to claim 8, characterized in that the motor (17) is arranged on the rear axle of the frame (10) or is designed as a hub motor.

10. 10. The stroller according to claim 8 or 9, wherein the drive unit (13) or the part of the drive unit (13) comprising the motor (17) and / or the at least one energy source is designed as a removable module.

11. 10. Pram according to claim 8 or 9, characterized in that the control unit is designed for the analysis of the detected data and for the control of the motor (17).

12. - a braked state of the stroller is detected, - when the automatic rocking function is activated, the stroller is automatically moved forward and backward by a drive device (13) to change the rocking distance, the start and end of said swing distance are each limited by the blocking of at least one wheel (12); 10. The stroller according to claim 8 or 9, wherein the control unit is configured so as to

13. 13. The stroller according to claim 12, wherein the control unit is configured in such a way that the power of the drive device (13) is increased after the start of the swinging distance and is reduced before the end of the swinging distance.

14. 13. The stroller according to claim 12, characterized in that the control unit is configured in such a way that the power of the drive (13) is reduced after 20% to 80% of the swinging distance.

15. 13. The stroller according to claim 12, wherein the control unit is configured in such a way that the power output of the drive device (13) is varied back and forth each time the swinging distance is traveled.

16. A frame for a baby carriage, said frame having a pusher (11) and wheels (12) for driving said frame, a drive (13) drivingly connected to at least one of said wheels (12), and a braking device (14) for at least one wheel (12) which can be transferred between a driving state with free rotation of the wheel and a braked state with at least one braked wheel (12), said drive (13) being operable for an automatic swinging function of said frame, A frame in which, due to the automatic swing of the frame, the wheel (12) braked by the braking device (14) can rotate to a limited extent in both circumferential directions of the wheel in the braked state.

17. A method for automatically rocking a stroller according to claim 12, comprising: - a braked state of the stroller is detected, - when the automatic rocking function is activated, the rocking distance of the stroller is automatically moved forward and backward by a drive device (13); - each of said start and end points of a swing section is defined by said block of at least one wheel (12); method.

18. 18. The method of claim 17, wherein the power of the drive (13) is increased after the beginning of a swing distance section and reduced before the end of the swing distance.

19. 19. The method of claim 18, wherein the power of the drive (13) is reduced after 20% to 80% of the swing distance.

20. 20. The method according to any one of claims 17 to 19, wherein the power output of the drive (13) is reduced to zero after reaching the end of the swing distance after a hold time.

21. 20. Method according to any one of claims 17 to 19, wherein the drive (13) is switched off when the stroller exceeds a maximum swing distance.

22. 20. A method according to any one of claims 17 to 19, wherein the power of the drive (13) is varied back and forth for each travel of the swing distance.

23. 20. The method according to any one of claims 17 to 19, wherein the length of the swing distance is adjusted or set to different sizes.

24. 20. The method of any one of claims 17 to 19, wherein the length of the swing distance is automatically adjusted to a shorter or longer swing distance during the swing period.

Images