Foldable frame for pram
Patent Information
- Application Number
- EP2024711865
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-03-17
- Filing Date
- 2024-03-13
- Publication Date
- 2026-01-21
AI Technical Summary
Existing folding stroller frames are complex to unfold and fold, pose a risk of injury due to mechanical complications, and are costly to manufacture, with many components and gears that wear out easily.
A stroller frame design featuring a first, second, and third frame element connected by a tension element, allowing for a single, simple, and continuous movement from a storage to a use position, with the first frame element driving the second frame element via the tension element when an idle angle is reached, reducing the need for multiple handles and complex mechanisms.
The solution enables easy, safe, and cost-effective transfer between storage and use positions with reduced risk of injury and lower manufacturing costs, using a minimal number of components and a dimensionally unstable tension element for smooth operation.
Smart Images
Figure EP2024056644_26092024_PF_FP
Abstract
Description
[0001] Folding frame for strollers
[0002] Description
[0003] A variety of stroller frames that can be connected to a child seat are available. The stroller frames are either permanently attached to the child seat or can be detachably connected when needed.
[0004] Stroller frames, however, are not used constantly and must be stored temporarily when not in use. When not in use, a stroller frame, and if possible, an associated seat, should take up little space, allowing for space-saving storage. For this purpose, a stroller frame or stroller can often be folded.
[0005] A disadvantage of existing collapsible strollers is that folding and unfolding is very complicated and technically complex. In particular, unfolding the stroller requires a large number of manual steps to transfer the child seat from the folded state (storage position) to the unfolded state (use position). The large number of manual steps required for unfolding are often difficult to remember, not intuitive, and mechanically complicated to perform. Previously known collapsible strollers also pose a significant risk of injury, particularly from pinching fingers and / or hands when unfolding (or folding) the stroller. Previously known collapsible strollers also have a technically complex design.
[0006] There is therefore a fundamental need for strollers that can be easily converted from a stowed position to a use position, especially without requiring numerous handles or tools. Systems designed to facilitate easier unfolding are currently available, but they require difficult-to-design end stops and synchronized coupling systems in one or more joints formed by frame elements of the stroller frame.
[0007] For example, CN 103523068 B discloses a stroller frame in which the pusher section and the front wheel brace each have a gear component within a joint that cooperates to synchronize the movement of the pusher section with the front wheel brace. However, this has the disadvantage that many components are required, and the gears are subject to high stress and therefore require expensive manufacturing, thereby increasing overall manufacturing costs. Furthermore, the gears wear out, disrupting smooth synchronization.
[0008] It is therefore an object of the present invention to reduce or eliminate at least one of the aforementioned disadvantages and to provide a simple, robust, safe and cost-effective solution, in particular to provide a solution in which the unfolding or unfolding of a stroller frame is made possible in a single, simple and continuous movement of the user.
[0009] The object is achieved by a stroller frame according to claim 1, as well as a method according to claim 14.
[0010] In particular, the object is achieved by a stroller frame, comprising a first frame element, a second frame element, a third frame element and a traction element, wherein the first, second and third frame elements are rotatably connected to one another and can be transferred by rotation between a use position and a storage position, wherein during the transfer from the storage position to the use position, the first frame element is moved relative to the third frame element in a first direction and covers a first angular range, and the second frame element is also moved relative to the third frame element in the first direction and covers a second angular range, wherein the second angular range is preferably smaller than the first angular range, characterized in that the first frame element and the second
[0011] Frame element are connected to one another by the tension element and the first frame element drives the second frame element via the tension element to move in the first direction when the first frame element has reached or exceeded an idle angle relative to the second frame element.
[0012] In particular, the object of the invention is achieved by a stroller frame comprising: a first frame element, a second frame element, a third frame element and a traction element, wherein the first, second and third frame elements are rotatably connected to one another and can be transferred from a use position into a storage position by rotation, wherein during the transfer from the storage position to the use position, the first frame element is moved relative to the third frame element in a first direction and covers a first angular range, and the second frame element is also moved relative to the third frame element in the first direction and covers a second angular range, wherein the second angular range is smaller than the first angular range, wherein the first angular range is defined in particular as the range in which a first angle can lie during the transfer between the storage position and the use position,and wherein the second angular range is defined in particular as the range in which a second angle can lie during transfer between the stowed position and the use position. The first angle particularly indicates the angle in the first direction between a third extension direction of the third frame element and a first extension direction of the first frame element around the intersection point of the first and third extension directions in a plane that is perpendicular to one or more axes about which the third frame element is rotatably connected to another frame element, and the second angle particularly indicates the angle in the first direction between the third extension direction of the third frame element and a second extension direction of the second frame element around the intersection point of the second and third extension directions in a plane that is perpendicular to one or more axes.about which the third frame element is rotatably connected to another frame element. Furthermore, the first frame element and the second frame element are connected to each other by the tension element, and the first frame element drives the second frame element via the tension element to move in the first direction when the first frame element has reached or exceeded a freewheel angle relative to the second frame element.
[0013] The first direction describes a direction which at least essentially indicates the direction of movement of the first frame element when it is moved out of the stowed position or unfolded.
[0014] The first and second angles are determined by the angle defined by the first and second directions of extension, respectively, in conjunction with the third direction of extension. The angle is determined such that the angle between a line parallel to the third direction of extension and a line parallel to the first and second directions of extension is determined around the intersection point of the two lines, starting from the third direction of extension in the first direction.
[0015] The direction of extension of a frame element is preferably the direction in which the respective frame element essentially extends. The direction of extension can be defined by the two furthest apart points of the frame element. Alternatively or additionally, the respective direction of extension can be the direction defined by the longest possible distance within the frame element.
[0016] Reaching (or exceeding) an idle angle can be understood as meaning that during the transfer from the stowed position to the use position, the angle between the first frame element and the second frame element reaches or exceeds the idle angle (so that the first frame element can drive the second frame element via the pulling element) after the angle between the first frame element and the second frame element was initially smaller than the idle angle (so that the first frame element could not drive the second frame element via the pulling element).
[0017] Exceeding the idle angle may be possible, especially if the tension element has a certain elasticity, so that its length can change (reversibly) under tensile load.
[0018] Shortly after leaving the stowage position for transfer to the
[0019] In the use position (preferably also in the stowed position itself), the second frame element is arranged between the first and third frame elements (this means in a view looking in the direction of at least one of the axes, i.e., typically a side view). Shortly after leaving the stowed position can mean, for example, that each of the elements has swept a maximum of 10° or a maximum of 5° since leaving the stowed position. For example, at least two of the frame elements can also lie directly on top of each other in the stowed position itself.
[0020] When transferring the stroller frame from the storage position to the use position, the first frame element is moved or rotated relative to the third frame element in a first direction, in particular away from the second frame element, and covers a first angular range.
[0021] When the first frame element has reached (or possibly exceeded) a predetermined angle relative to the second frame element, the above-mentioned idle angle, the first frame element drives the second frame element via the pulling element to move in the first direction or the first frame element pulls the second frame element in the first direction, so that the second frame element covers the second angular range (or is at least supported in doing so).
[0022] The stroller frame comprises at least one (first) axis of rotation between at least two of the first, second and third frame elements.
[0023] A storage position is understood to mean, in particular, a position in which the stroller frame is at least substantially folded together, and a use position is understood to mean, in particular, a position in which the stroller frame is at least substantially unfolded.
[0024] It may be that the second frame element is already moving away from the third frame element due to the effect of gravity or due to the pressure of compressed soft goods or similar, without the position of the second frame element necessarily being reached as a result.
[0025] It can be provided that the first frame element does not drive the second frame element until the use position is fully reached, but only to a position from which the weight of the stroller frame or a force applied from the outside for pushing acts on the frame elements in such a way that they are driven further to move into the use position (for example, when the stroller frame is carried by the wheels).
[0026] The invention is based on the idea of utilizing the shared mounting of the frame elements to couple the second frame element to the first frame element in such a way that only the first frame element (particularly relative to the third frame element) needs to be moved to unfold the stroller frame. At the same time, the effect just described can be achieved with a delay due to the idle angle, which allows for a less strenuous and more continuous movement when unfolding the stroller frame.
[0027] The first frame element can preferably be a slider section, the second frame element can preferably be a rear wheel strut, and the third frame element can preferably be a front wheel strut.
[0028] In a preferred embodiment, the tension element is connected at a first end to the first frame element at a first connection point, and at a second end to the second frame element at a second connection point.
[0029] Attaching the tension element to each end is advantageous, as this allows a simple adjustment of the tension element's length (as well as the position of the attachment points and, if applicable, other geometric features of the stroller frame) to determine the idle angle. In particular, attaching it to just two contact points is simpler and more cost-effective than more complex attachments.
[0030] It is further preferred that the tension element be dimensionally unstable, preferably as a band, belt, chain, or cord. "Dimensional unstable" means, in particular, that the tension element is reversibly bendable and / or foldable and / or rollable. The thickness (in particular, the minimum extension transverse to the extension direction) of the tension element is preferably at most 5 mm, more preferably at most 2 mm or at most 1 mm.
[0031] Due to its dimensionally unstable design, the tension element allows for easy folding or transfer into the stowed position, as it offers no (at least no significant) resistance when the first frame element and the second frame element are brought close together. Instead, the use of such a tension element allows for automatic folding and / or deflection of the tension element. Furthermore, the specified means are both easy to install and inexpensive to manufacture, making them easy to replace should signs of wear and tear make this necessary.
[0032] According to a further preferred embodiment, the idle angle can be adjusted or changed by adjusting and / or changing the length of the tension element and / or the first and / or second connection point, particularly during transfer between the stowed position and the use position. Preferably, this can be done by a sliding attachment to the first and / or second connection point.
[0033] The connection of the tension element to the respective frame elements can be a fixed connection and / or a movable, in particular sliding, connection; preferably, each of the ends of the tension element is either fixed or (sliding) movable, further preferably one end is fixed and the other end is (sliding) movable to the respective frame elements.
[0034] A fixed connection should be defined by a constant connection point of the tension element to the associated frame element, in particular one that is stationary with respect to the frame element, although rotation about the connection point may still be possible.
[0035] A fixed connection can, for example, comprise a detachable, in particular tool-free and / or non-destructively detachable, and / or non-detachable connection between the tension element and the associated frame element, in particular a riveted connection. A movable, in particular sliding, connection should be defined by a connection point of the tension element, which can move in a specific area of the associated frame element. Preferably, the connection point can be located relatively close (e.g. at a distance of at least 1 cm, preferably at least 4 cm and / or at most 14 cm, preferably at most 10 cm) to the first or second axis of rotation in the use position and between the position that is relatively close (e.g. at a distance of at least 1 cm, preferably at least 4 cm and / or at most 14 cm, preferably at most 10 cm) to the first or second axis of rotation in the stowed position and a more distant position (e.g.at a distance of at least 2 cm, preferably at least 6 cm and / or at most 18 cm, preferably at most 12 cm) (whereby the possibility of sliding is progressively reduced when transferring from the stowed position to the use position).
[0036] Similar to the fixed connection, a (sliding) movable connection can comprise a detachable and / or non-detachable connection between the tension element and the associated frame element.
[0037] A detachable connection can be designed as a buckle connection, for example.
[0038] A non-detachable connection can be designed as a rivet or screw connection, for example, but also as a belt loop.
[0039] A (sliding) movable connection can be designed, for example, as a loop (e.g. formed by the tension band itself, in particular by sewing it to itself) or as a ring or by means of a sliding block (for sliding in a guide formed in the corresponding frame element) or similar.
[0040] The connection points of the tension element can be spaced from a first and / or second axis of rotation, preferably at least 1 cm or at least 3 cm (wherein the connection point can, for example, be located on a housing of the joint), and / or a maximum of 30 cm, preferably a maximum of 15 cm.
[0041] The minimum and / or maximum distance of the connection point from the first or second axis of the frame elements can also be specified in the case of a sliding connection, for example, by a stop element. The length of the tension element can be between 5 cm and 35 cm, preferably 10 cm and 25 cm, and more preferably 15 cm and 20 cm.
[0042] A sliding attachment is understood as an attachment in which a connection point can be moved along a direction of extension of the frame element. Suitable for this purpose are, for example, rails that fix a connection point by locking into place. However, even simple tabs that are placed around the respective frame element and can thus move along the direction of extension are slidingly movable within the meaning of this application. It is possible to prevent slipping along the direction of extension of the frame element by securing it (for example, by means of at least one locking device and / or at least one cam and / or at least one hook, or similar).
[0043] In a further preferred embodiment, the stroller frame has a first joint at one end of the third frame element, wherein the first and / or second frame element are connected to the third frame element so as to be rotatable about the first joint.
[0044] By coupling the frame elements with at least one joint, a pivotable connection between the frame elements can be achieved. A design with a joint is also particularly simple and requires a minimal number of components. The resulting geometry is also particularly simple, allowing the stroller frame to be easily transferred from a storage position to a use position. At one end, the first joint is always the one closest to a distal end of the third frame element.
[0045] A joint is any attachment / bearing that allows the frame elements to rotate relative to each other around an axis.
[0046] According to a further preferred embodiment, the frame has a second joint which is attached to the first, second or third frame element in order to rotatably connect the first and second or second and third or first and third frame elements to one another, wherein the axis of rotation is parallel to the axis of rotation of the first joint. By using a second joint, not all frame elements rotate about the same axis. The resulting offset between the first and second joints can create a gap in the stowed position which allows the frame to be stowed in a more compact form. Especially when, as is usually the case, other elements (such as a bag or a child support unit) are attached to the frame elements, this arrangement allows the stroller frame to be folded into a more compact form, since the other elements do not block one another or the frame elements.
[0047] The first, second, and third frame elements are always connected to one another so that they can rotate about at least one axis. In embodiments with two joints, one of the frame elements can be connected to one of the other two frame elements via a first axis and to the other of the other two frame elements via a second axis parallel to the first axis, while the other two frame elements do not need to be directly connected to one another.
[0048] According to a further aspect, the frame can be locked in the use position and / or storage position. This is preferably achieved by at least one first locking element within the first and / or second joint, wherein the at least one first locking element can be spring-loaded and is preferably in direct or indirect operative connection with an unlocking device.
[0049] Typically, the stroller frame is either in use, kept ready for use, or stored in the stowed position. In the use position, accidental twisting of the frame elements relative to each other should be avoided, especially to increase safety and comfort. Therefore, it is advantageous if the stroller frame can be locked in the use position to prevent accidental twisting or folding of the frame elements.
[0050] Even when stored, it is preferable to lock the stroller frame. This prevents it from unfolding accidentally and, more importantly, ensures that the stroller frame remains in the stored position. This avoids unnecessary space consumption due to an incompletely folded stroller frame.
[0051] In addition, handling of the stroller frame in the stowed position is also made easier, as unwanted folding movements are prevented.
[0052] For example, the stowed position can also be locked by the first locking element or by a second (additional) locking element, e.g., by a hook on one of the frame elements pre-tensioned into a locked position and, optionally, a projection on another of the frame elements into which the hook can engage. The frame can comprise a first unlocking device for releasing the locking of the use position and / or stowed position, which can preferably be arranged on the first frame element, in particular on the slider section.
[0053] An additional second unlocking device, in particular one independent of the first unlocking device, can also be provided in order to be able to release the locking of the second locking element, e.g. the hook can be temporarily transferred into an unlocking position by actuating the second unlocking device.
[0054] In particular, it can be provided that the second locking element acts like a leaf spring and has a ramp and an engagement portion, in particular a hook, at a distal end. Upon reaching the stowed position, the other frame element can bend the engagement portion along the ramp against the force of the leaf spring until the engagement portion can be brought into engagement with the frame element (or, if applicable, the projection located thereon) by the force of the leaf spring. Unlocking can then be achieved by manually bending the second locking element.
[0055] The first frame element, in particular the slider section, can preferably comprise a proximal and a distal section, wherein the proximal section of the first frame element, in particular the slider section, can be rotatably and / or displaceably connected at one end to the distal section (for length or height adjustment) and rotatably connected at the other end to the second and / or third frame element. In one embodiment, the second frame element can be arranged in the stowed position (or at least shortly after leaving it) between the third frame element and the first frame element, in particular the proximal section of the first frame element.
[0056] In a further embodiment, the locking mechanism is automatically triggered when the use position and / or the storage position is reached.
[0057] Automatic release simplifies use, as fewer movements are required to move the stroller frame into a storage and / or use position. This allows for easier and safer handling.
[0058] In a further preferred embodiment, at least the first and / or second and / or third frame element is selected from a front wheel strut, rear wheel strut and slider section, wherein these are preferably selected in different pairs.
[0059] By selecting the frame elements from the list of elements mentioned above, the overall construction of the stroller frame is simplified, as unnecessary intermediate elements can be omitted.
[0060] In a further embodiment, the stroller frame comprises a child-receiving unit comprising a back section and a seat section, wherein the back section is preferably rotatably connected to the seat section and / or arranged rotatably relative to the seat section, wherein the surfaces of the back section and the seat section which contact the child preferably abut one another or lie opposite one another in the stowed position, in particular at an angle between the surfaces of at least 2°, but a maximum of 50°.
[0061] In one embodiment, the child support unit may be formed integrally with the stroller frame
[0062] In one embodiment, the child support unit can be detachably connected to the stroller frame, in particular without the need for tools and / or without damage, e.g., via at least one adapter. The child support unit can assume a storage position and a use position that is not necessarily identical to the storage / use position of the stroller frame.
[0063] Connecting the child restraint unit to the stroller frame simplifies assembly and disassembly. Opposing the two surfaces makes the overall storage position more compact. This ensures that the stroller frame remains compact enough for easy transport, storage, and handling, even when stowed.
[0064] In a further embodiment, the child support unit is connected to the stroller frame in such a way that the child support unit is transferred from the use position to the storage position at the same time as the stroller frame.
[0065] This makes it easy to convert the stroller into the use position, without having to adjust the child restraint system separately. It may also be advantageous to attach the child restraint system detachably to the stroller frame so that it can be removed if necessary.
[0066] In a further embodiment, the surfaces of the back section and buttocks section which do not touch the child can preferably lie against each other or opposite each other, in particular at an angle between the surfaces of at least 2°, but a maximum of 50°.
[0067] In one embodiment, the child-receiving unit can be transferred individually, in particular independently of the stroller frame, from the stowed position to a use position (and vice versa). Preferably, the transfer of the child-receiving unit can be possible before and / or after the transfer of the stroller frame. Further preferably, the child-receiving unit must already be in a stowed position before the stroller frame can be transferred from the use position to the stowed position. In a further embodiment, the child-receiving unit can be connected to the stroller frame in such a way that the child-receiving unit can be transferred simultaneously with the stroller frame from the use position to the stowed position (and vice versa).
[0068] In some embodiments, the second angle during transfer from the stowed position to the use position by rotating and / or pivoting the first frame element can be at least 0.2 times and / or at most 0.8 times the first angle, preferably at least 0.3 times and / or at most 0.7 times, more preferably at least 0.4 times and / or at most 0.6 times.
[0069] This ensures that sufficient compactness is ensured and, at the same time, sufficient freedom of movement between the frame elements is provided.
[0070] Further preferably, the first angle of the stroller frame can be 140° - 220°, preferably 160° - 200°, more preferably 110° - 240°, in particular 170° - 190°.
[0071] The corresponding angles enable an ergonomic geometry in a usage position, through a suitable arrangement of the frame elements against each other.
[0072] A further aspect of the invention comprises a method for transferring a stroller frame from a storage position to a use position according to claim 1, wherein the first frame element is rotated and / or tilted relative to the third frame element, wherein after reaching (or possibly exceeding) the idle angle between the first and second frame elements (in particular by the first angle), the second frame element is pulled in the first direction via the pulling element.
[0073] The method according to the invention allows the same advantages to be achieved as those already described in connection with the stroller frame according to the invention. It should be noted that the features described in the context of the stroller frame according to the invention preferably apply to the method according to the invention for unfolding a stroller frame. Likewise, features of the method according to the invention can be transferred to the stroller frame according to the invention by configuring the stroller frame in such a way that it is suitable for implementing the corresponding method features.
[0074] The invention is described below with regard to further details, features, and advantages, which are explained in more detail with reference to the figures. The described features and feature combinations, as shown below in the figures of the drawing and described with reference to the drawing, are applicable not only in the respective combinations specified, but also in other combinations or on their own, without thereby departing from the scope of the invention.
[0075] Here we show:
[0076] Fig. l A stroller frame
[0077] Fig.2 Components of a stroller frame
[0078] Fig.3-Fig.5 A first embodiment with a joint
[0079] Fig.6-Fig.8 Another embodiment with a joint
[0080] Fig.9-Fig. ll Embodiments with two joints
[0081] Fig.12 An illustration of the angle determination
[0082] Fig.13 A stroller frame with child support unit
[0083] Fig.14 Another view of the stroller frame with
[0084] Children's reception unit
[0085] Fig.15 A view of a first joint
[0086] Fig. 16 Another view of the stroller frame with
[0087] Children's reception unit
[0088] Figure 1 shows a stroller frame 10. In the embodiment shown, the stroller frame 10 has a first joint 5, by means of which the third frame element 3, the first frame element 1 and the second frame element 2 are rotatably connected to one another. All frame elements can be rotated about the axis predetermined by the first joint 5. The first frame element 1 and the second frame element 2 are coupled to one another via the tension element 4. In the illustration shown, the stroller frame 10 is in the use position, which means that it is fully unfolded. As shown, wheels can be attached to the ends of the third and second frame elements 3, 2, which are not connected to one another via the first joint 5.
[0089] Figure 2 shows components of a stroller frame. Specifically, Figure 2 shows the first frame element 1, the second frame element 2, the third frame element 3, and the tension element 4.
[0090] Figure 3 also shows an embodiment with only a first joint 5, in the stowed position. This stowed position is characterized in particular by the fact that all frame elements are folded relatively close together. The dimensionally unstable tension element 4 can assume a sagging shape, allowing the first frame element 1 to move closer to the second frame element 2.
[0091] Figure 4 shows the embodiment from Figure 3 in a partially unfolded position, i.e. a position which is reached by moving the first frame element 1 in the first direction, before the use position is reached. As shown, the tension element is in a particularly fully extended position, between the first connection point API, at which the tension element 4 is connected to the first frame element 1, and the second connection point AP2, at which the tension element 4 is connected to the second frame element 2. Through this connection, the first frame element 1 exerts a force in the first direction on the second frame element 2 when it is itself moved in this direction. The length of the tension element 4 can result in the idle angle LW, which is an angle between the direction of extension of the second frame element 2 and the first frame element 1.
[0092] Figure 5 shows a further stage of unfolding a stroller frame 10 with a first joint 5. After the idle angle LW has been reached (or possibly exceeded), the first frame element 1 exerts a force on the second frame element 2 in the first direction, thereby moving it further. This causes the second frame element 2 to rotate about the axis defined by the first joint 5. This opens and increases a second angle W2, which is defined by the angle between the extension direction of the third frame element 3 and the extension direction of the second frame element 2 around their intersection point, measured in the first direction. In an embodiment with only one first joint 5, the intersection point is typically the axis of said joint 5.The first angle W1 results from the angle between the extension direction of the third frame element 3 and the first frame element 1, also in the first direction around the axis of the first joint 5. In the figure, the first direction points to the right away from the third frame element 3 (counterclockwise). In a single-axis embodiment, such as the one shown here, it necessarily results that the first angle W1 is the sum of the second angle W2 and the idle angle (not shown here).
[0093] Figure 6 shows a further embodiment of the present invention with only a first joint 5. Again, the stroller frame 10 is shown in the stowed position.
[0094] Figure 7 shows the embodiment from Figure 6 when the idle angle LW is reached. A difference from Figures 3-5 is that the tension element 4 does not define the idle angle LW in a straight extension, but is at least partially wrapped around the first joint 5. Furthermore, the first direction in the illustration now points to the left, away from the third frame element 3 (clockwise).
[0095] Figure 8 again shows a further stage of unfolding, which follows the state in Figure 7. Due to the forced further movement of the second frame element 2 by the movement of the first frame element 1, a second angle W2 opens again. The tension element 4, which can wrap around the first joint 5, can pull the second frame element 2 upwards to the left when the first frame element 1 is rotated to the right. It can be seen again that in a single-axis arrangement, the first angle W1 results from the sum of the idle angle (not shown here) and the second angle W2.
[0096] In Figures 2-5, the first frame element can be viewed as a slider, the second frame element as a rear wheel strut, and the third frame element as a front wheel strut. In Figures 6-8, the first frame element can also be viewed as a slider, the second frame element as a front wheel strut, and the third frame element as a rear wheel strut. The frame elements can generally be designed in a strut-like manner (as shown in Figures 2-8), but the disc shown at the respective proximal ends is only an example for forming a joint and is not absolutely necessary.
[0097] Figure 9 shows another embodiment of a stroller frame 10, which has a first joint 5 and a second joint 6. In the embodiment shown, the second joint 6 is attached as a connection between the first frame element 1 and the second frame element 2.
[0098] Figure 10 shows a further embodiment with a first joint 5 and a second joint 6, wherein the second joint 6 establishes a connection between the third frame element 3 and the second frame element 1.
[0099] Figure 11 shows a further two-joint embodiment in which the second joint 6 connects the first frame element 1 and the second frame element 2.
[0100] Figure 12 illustrates the determination of the first angle W1 and the second angle W2 in the more complicated situation of a two-jointed stroller frame. In such an embodiment, the frame elements do not all rotate about the axis specified by the first joint 5, but rather there is a superposition of rotations about the axis of the first joint 5 with rotations about the axis of the second joint 6. For better illustration, the first extension direction ER1, second extension direction ER2 and the third extension direction ER3 of the first, second and third frame elements 1, 2, 3 have been explicitly drawn. The first angle W1 is determined from the angle of the first extension direction ER1 to the third extension direction ER3, around their intersection point.Since the first angle W1 belongs to a rotation that is intended to describe the movement of the first frame element 1 in the first direction, a first angle W1 of more than 180° results in the position shown, as shown. The second angle W2 results from the angle between the second extension direction ER2 and the third extension direction ER3 around their intersection point, and is less than 90° in the position shown. The idle angle LW between the first and second frame elements 1, 2 (not shown here) does not necessarily result from the addition of the first and second angles W1, W2 in the case of a two-jointed arrangement.
[0101] Figure 13 shows a stroller frame 10 with a child support unit 20, comprising a seat section 21 and a back section 22. The child support unit 20 is attached to the stroller frame 10 and is located together with the frame in the use position.
[0102] Figure 14 shows a side view of the stroller frame 10 with the child restraint unit 20 as shown in Figure 13. It shows how the tension element 4 is attached in the use position in a state of maximum tension between the first frame element 1 and the second frame element 2.
[0103] Figure 15 shows an enlarged view of the first joint 5 according to one embodiment. The second frame element 2 comprises two parallel rods. The first frame element 1, the second frame element 2, and the third frame element 3 can in turn be rotated relative to one another about the axis of the first joint 5. The tension element 4, which connects the first frame element 1 to the second frame element 2, is attached here to the first attachment point API on the first frame element 1. Shown is an arrangement in which the first attachment point API is fixedly attached to the first frame element 1 by a rivet 7. The second attachment point AP2 is slidably attached to the second frame element 2. In the embodiment shown here, the slidable attachment results from the use of a loop, which allows the second application point AP2 to be displaced along the extension direction of the second frame element.In the embodiment shown, the rear wheel strut forms the second frame element 2, the slider forming the first frame element 1 and the front wheel strut forming the third frame element 3.
[0104] Figure 16 shows a stroller frame 10 in the stowed position. The tension element 4 is attached to the first frame element 1 with a rivet 7 at the first connection point and to the second frame element with a loop. It should be noted at this point that all of the parts described above, viewed individually and in any combination, particularly the details shown in the drawings, are claimed as essential to the invention. Modifications to these are familiar to those skilled in the art.
[0105] Furthermore, it is pointed out that the broadest possible scope of protection is sought. In this respect, the disclosure contained in the claims can also be clarified by features that are described with further features (even without these further features being mandatory). It is explicitly pointed out that parentheses and the term "in particular" are intended to emphasize the optionality of features in the respective context (which does not mean, conversely, that without such identification, a feature is to be considered mandatory in the corresponding context). The term "element / element" is preferably intended to identify a coherent structure (or assembly), which in turn can be connected to at least one other structure (to form a possibly integral and / or inherently immobile overall structure) or can be delimited from all other structures.
[0106] At least figures 13 - 16 also have aspects that are of an aesthetic nature.
[0107] List of reference symbols
[0108] First frame element 1
[0109] Second frame element 2
[0110] Third frame element 3
[0111] Tension element 4
[0112] First angle W1
[0113] Second angle W2
[0114] First extension direction ER1
[0115] Second extension direction ER2
[0116] Third extension direction ER3
[0117] First connection point API
[0118] Second connection point AP2
[0119] First joint 5
[0120] Second joint 6
[0121] Stroller frame 10
[0122] Children's Admission Unit 20
[0123] Seat 21 Backrest 22
[0124] Idle angle LW
[0125] Rivet 7
Claims
Claims 1. Stroller frame (10) comprising: a first frame element (1), a second frame element (2), a third frame element (3) and a traction element (4), wherein the first, second and third frame elements (1, 2, 3) are rotatably connected to one another and can be transferred by rotation between a use position and a stowed position, wherein during the transfer from the stowed position to the use position, the first frame element (1) is moved relative to the third frame element (3) in a first direction and covers a first angular range, and the second frame element (2) is also moved relative to the third frame element (3) in the first direction and covers a second angular range, wherein the second angular range is preferably smaller than the first angular range, characterized in thatthat the first frame element (1) and the second frame element (2) are connected to one another by the tension element (4) and the first frame element (1) drives the second frame element (2) to move in the first direction via the tension element (4) when the first frame element (1) has reached or exceeded an idle angle (LW) relative to the second frame element (2).
2. Stroller frame (10), in particular according to claim 1, comprising: a first frame element (1), a second frame element (2), a third frame element (3) and a pulling element (4), wherein the first, second and third frame elements (1, 2, 3) are rotatably connected to one another and can be transferred by rotation between a use position and a stowed position, wherein during the transfer from the stowed position to the use position, the first frame element (1) is moved relative to the third frame element (3) in a first direction and covers a first angular range, and the second frame element (2) is also moved relative to the third frame element (3) in the first direction and covers a second angular range, wherein the second angular range is preferably smaller than the first angular range, wherein the first angular range is defined in particular as the range in which a first angle (Wl) can lie during the transfer between the stowed position and the use position, and wherein the second angular range is defined in particular as the range in which a second angle (W2) can lie during the transfer between the stowed position and the use position, wherein the first angle (Wl) indicates the angle in the first direction between a third extension direction (ER3) of the third frame element (3) and a first extension direction (ER1) of the first frame element (1) around the intersection point of the first and third extension directions (ER1, ER3) in a plane that is perpendicular to one or more axes about which the third frame element (3) is rotatably connected to another frame element,and wherein the second angle (W2) indicates the angle in the first direction between a third extension direction (ER3) of the third frame element (3) and a second extension direction (ER2) of the second frame element (2) around the intersection point of the second and third extension directions (ER2, ER3) in a plane perpendicular to one or more axes about which the third frame element (3) is rotatably connected to another frame element, characterized in that the first frame element (1) and the second frame element (2) are connected to one another by the tension element (4), and the first frame element (1) drives the second frame element (2) to move in the first direction via the tension element (4) when the first frame element (2) has reached or exceeded an idle angle (LW) relative to the second frame element (2).
3. Stroller frame (10) according to claim 1 or 2, wherein the tension element (4) is connected at a first end to a first connection point (API) with the first frame element (1), and at a second end to a second connection point (AP2) is connected to the second frame element (2).
4. Stroller frame (10) according to one of the preceding claims, wherein the tension element (4) is designed to be dimensionally unstable, preferably as a band, belt, chain or cord.
5. Stroller frame (10) according to one of the preceding claims, comprising a first joint (5) at one end of the third frame element (3), wherein the first and / or second frame element (1, 2) are connected to the third frame element (3) so as to be rotatable about the first joint (5).
6. Stroller frame (10) according to one of the preceding claims, in particular according to claim 5, comprising a second joint (6) which is attached to the first, second or third frame element (1, 2, 3) in order to rotatably connect the first and second (1, 2) or second and third (2, 3) or first and third frame element (1, 3) to one another, wherein the axis of rotation is parallel to the axis of rotation of the first joint (5).
7. Stroller frame (10) according to one of the preceding claims, in particular according to one of claims 5 and 6, wherein the frame can be locked in the use position and / or storage position, preferably by a first locking element within the first and / or second joint (5, 6), wherein the locking element is preferably in direct or indirect operative connection with an unlocking device.
8. Stroller frame according to one of the preceding claims, in particular according to claim 7, wherein a locking mechanism is automatically triggered when the use position and / or the storage position is reached.
9. Stroller frame (10) according to one of the preceding claims, wherein at least the first and / or second and / or third frame element (1, 2, 3) consists of a front wheel strut, rear wheel strut and slider section can be selected, wherein they are preferably selected in pairs different from each other.
10. Stroller frame (10) according to one of the preceding claims, comprising a child-receiving unit (20) comprising a back section (22) and a seat section (21), wherein the back section (22) is preferably rotatably connected to the seat section (21) and / or arranged rotatably relative to the seat section (21), wherein the surfaces of the back section (22) and the seat section (21) which touch a child received in the child-receiving unit (20) preferably abut one another or lie opposite one another in the stowed position, in particular at an angle between the surfaces of at least 2° and / or a maximum of 50°.
11. Stroller frame (10) according to one of the preceding claims, wherein the child receiving unit (20) is connected to the stroller frame (10) in such a way that the child receiving unit (20) is transferred from the use position to the storage position simultaneously with the stroller frame (10).
12. Stroller frame (10) according to one of the preceding claims, wherein the second angular range during the transfer from the stowed position to the use position by rotating and / or pivoting the first frame element (1) is at least 0.2 times and / or at most 0.8 times the first angular range, preferably at least 0.3 times and / or at most 0.7 times, more preferably at least 0.4 times and / or at most 0.6 times.
13. Stroller frame (10) according to one of the preceding claims, wherein the first angular range can be 140° - 220°, preferably 160° - 200°, more preferably 110° - 240°, in particular 170° - 190°.
14. Method for transferring a stroller frame (10) from a storage position into a use position according to claim 1, wherein the first frame element (1) is rotated and / or tilted relative to the third frame element (3), wherein after reaching or exceeding the Idle angle (LW) by the first frame element (1) the second frame element (2) is pulled in the first direction via the pulling element (4).