Pushchair

Description

[0001] The invention relates to a stroller frame and a corresponding stroller, as well as a method for folding a stroller frame.

[0002] Prior art includes strollers or stroller frames that can be folded to allow for a more compact position (e.g., during transport). In this context, DE 20 22005008 369 U1 discloses a folding mechanism in which a folded position can be locked by snapping a hook onto a connecting strut. The lock can be released via a release pedal. Further foldable stroller frames with a locking mechanism for the folded position are known from US 7,311,323 B1, US 2014 / 0159348 A1, DE 102 06 042 A1, and US 4,529,219 A1. Furthermore, mechanisms are known in which a locking unit is provided directly in the rotatable or foldable joint. Overall, the solutions in the state of the art are perceived as complex or at least impractical.

[0003] The object of the invention is to propose the simplest possible solution for folding a stroller frame. In particular, the manufacturing effort should be comparatively low, while still allowing for relatively simple and trouble-free operation of the corresponding folding mechanism.

[0004] This problem is solved in particular by the features of claim 1.

[0005] In particular, the problem is solved by a pram frame which can be (reversibly) transferred from a usage position to a transport position (e.g. foldable and / or collapsible), comprising a first frame part and a second frame part which can be folded relative to each other, a first locking device arranged on a first frame part (or, if necessary, permanently connected to it) for locking a folded position of the first frame part relative to the second frame part, and a position transfer device for transferring the first locking device from a first position relative to the first frame part to a second position relative to the first frame part.

[0006] A key concept of the invention is to provide a locking device that can be positioned in different ways relative to the frame part on which it is mounted. This allows the locking device itself to be changed in position, thus enabling a corresponding (advantageous) adjustment of the stroller frame. In particular, this makes it possible to set a position (especially the second position) in which the locking device is less obstructive.

[0007] A locking device is understood to be, in particular, a (possibly one-piece, preferably monolithic) locking element. Generally, the locking device is configured to lock (or secure) a folded position of the first frame part relative to the second frame part.

[0008] A position transfer device is a device configured to move the locking device from a first position (opposite the first frame part) to a second position.

[0009] The first and second positions are preferably stable, particularly in the sense that the respective position is maintained (at least) when no external force is applied. In addition to a first and second position, at least one or more further intermediate positions may be possible. These may be stable or unstable (unstable, for example, if a spring mechanism ensures that the first or second position is ultimately set when no external force is present). The first and second positions may, in particular, refer to an orientation and / or position of at least one part of the locking device. If a pivotable part is present, the first and second positions preferably differ in that the angle between the first and second positions is at least 10°, preferably at least 30°, optionally at least 60°, or even (at least approximately) 90°.If the first and second positions can be adjusted by a (possibly at least partially translational) change in position of the locking device or a part of the locking device, this preferably means that a distal end of this part or of the entire locking device has a different distance to the first frame part in the first position than in the second position (for example, a distance that differs by at least ± 10% from the distance that is present in the second position, preferably by at least 30%, more preferably by at least 60%, possibly by 100%).

[0010] The first and second positions are different positions achieved by rotating and / or displacing (rotationally moving) a preferably dimensionally stable or rigid part of the locking device, or preferably the entire dimensionally stable or rigid locking device. However, these can also be positions in which a (non-rigid) part is deformed (for example, compressed, stretched, and / or bent). A combination of rotation and / or translation and / or deformation is also possible.

[0011] Preferably, the locking device is (possibly exclusively) designed and configured for locking a (partially or fully) folded frame position (transport position). A separate locking mechanism may then be provided for locking a (partially or fully) unfolded frame position (use position). The stroller frame can optionally be moved into more than two frame positions. Preferably, at least a first and a second frame position are lockable; optionally, one or more further frame positions (intermediate frame positions) may also be lockable.

[0012] The first and second frame parts are preferably designed as profiles and / or are formed by a shaft and / or a tube and / or have a round or polygonal, in particular rectangular, cross-section (possibly constant along its length). The first and second frame parts can, for example, at least partially form a sliding shaft or a wheel stay (rear wheel stay or front wheel stay). The first and second frame parts are preferably arranged on different elements of the group consisting of the sliding shaft, rear wheel stay, and front wheel stay, but can also be arranged on the same element (for example, when it comes to folding a sliding shaft in on itself).

[0013] The term "folding" refers in particular to a process in which the first and second frame parts are hinged to each other and the distal ends of the two frame parts are brought closer together (folding) or moved apart (unfolding) by pivoting. In the folded state, the first and second frame parts may have an angle to each other of less than 20°, preferably less than 10°; optionally, the first and second frame parts may be aligned (at least substantially) parallel (i.e., have an "angle" of 0°). In the unfolded state, the angle is preferably greater than 20°, more preferably greater than 30°, optionally greater than 45° or greater than 90° (depending on the specific application).

[0014] The first locking device can be the only locking device (so that "first" does not imply that a further, "second" locking device must also be provided). However, further locking devices may also be provided. These further locking devices can also be considered "first" locking devices in this sense if they are configured analogously to the first locking device, for example, if they are located on (or connected to) the first frame part or another (identically or mirror-image) first frame part.

[0015] A corresponding ("second") locking device can also be arranged on the second frame section (connected to the second frame section). This second locking device can then be designed and arranged like the first locking device, or it can be designed and arranged differently. Several such second locking devices can also be provided (or only one, or none at all).

[0016] The first locking device can interact with a corresponding second locking device (in the second frame part) to achieve overall locking. However, such a second locking device is not strictly necessary, for example, if the first locking device is designed to achieve locking with the second frame part per se (for example, by at least partially enclosing the second frame part). If a second locking device (on the second frame part) is provided, this second locking device is preferably immovable relative to the second frame part (possibly rigidly and / or integrally connected to it). The second locking device can, for example, comprise a pin that can be engaged with a hook.The pin preferably has a protruding (distal) end section, preferably so that the hook is secured against lateral displacement in the engagement position.

[0017] The arrangement of the first locking device on the first frame member means, in particular, that the first frame member remains attached to the first frame member when its position or folding position relative to the second frame member changes. Specifically, the first locking device can be connected to the first frame member by a hinge or by a translational mechanism, allowing at least partial displacement (e.g., telescopically). The connection can be detachable or non-detachable (i.e., detachable only by destroying the entire structure). If a detachable connection is used, separate connecting devices are preferably provided that must be released separately (e.g., screws, pins, or the like).

[0018] The term "arrangement on the (first) frame member" specifically excludes any arrangement on or in a joint between the first and second frame members. Therefore, the locking device can be spaced away from a joint or a corresponding axis of rotation (preferably by at least 3 cm, more preferably at least 6 cm). When measuring this distance, the relevant point of connection between the first locking device and the first frame member is preferably the relevant location. The first and / or second frame member is preferably a (longitudinal) profile, in particular a strut (or a section thereof). The profile can, for example, be a hollow profile or have a U-shaped or C-shaped cross-section.

[0019] The stroller frame can have a (possibly U-shaped) handle section. This can be a single piece or optionally comprise two parts (preferably arranged on both sides). In any case, two (opposite, possibly parallel) handle shafts can be arranged, which may optionally be connected by the (especially U-shaped) upper handle section. Optionally, the (parallel) handle shafts can pivot relative to the upper handle section.

[0020] The (respective) sliding shaft can be connected to a front wheel and / or rear wheel strut (possibly with the upper strut ends) which is coupled to the (respective) joint.

[0021] The stroller frame can have at least three wheels or at least at least three attachment points for suitable wheels.

[0022] The aforementioned problem is also solved, in particular, by the features of claim 16 in a stroller comprising a stroller frame as described above and below. This frame may include at least one seat and / or reclining unit and / or at least one attachment point for such a seat and / or reclining unit. The seat and / or reclining unit may be an integral part of the stroller (for example, permanently attached to the stroller frame) or detachably arranged in a corresponding stroller frame (and, if necessary, replaceable).

[0023] Preferably, the position transfer device is configured such that a position transfer occurs automatically, more preferably by means of a mechanical coupling between at least one frame part (which is not the first frame part, i.e., for example, the second or a third frame part) and the position transfer device, when (if or as soon as) the two frame parts are unfolded and / or when (if or as soon as) they are folded together. In particular, unfolding or folding should cause an automatic position transfer.

[0024] The position transition (in terms of timing) can occur during the opening or folding process (over at least a portion of the respective process) or can be triggered by the opening or folding process (and, for example, only occur once the folding process itself is complete; a delay can therefore be incorporated). However, it is preferred if the opening or folding process and the position transition overlap at least in time, or if the position transition occurs within the time period defined by the opening or folding process. Preferably, at least a portion (in particular, a portion that is predominant in terms of distance or angle) of the position transition occurs after an unlocking process or before a latching or snapping process (for locking).

[0025] The position transition can be controlled mechanically (by a mechanical coupling) and / or electrically or electronically (in which case appropriate sensors may be provided). A mechanical coupling refers in particular to a (mechanical) operative connection in which the opening or closing of the frame parts results in the corresponding position transition. For this purpose, a corresponding direct or indirect connection is (temporarily) formed between at least one of the frame parts of the position transition device or the locking device.

[0026] Overall, an automatic mechanism allows for a particularly simple transfer of positions, which simplifies operation.

[0027] The locking device preferably projects from the first frame member in the first position. Alternatively or additionally, in a second position, the locking device does not project from the first frame member (is flush) or projects (at least) less than in the first position. Such a projection (protrusion) is understood to mean, in particular, that a distal end of the locking device (or a movable part thereof) has a distance from an outer surface of the frame member, or has a greater distance from the outer surface of the frame member than a proximal end. The corresponding distance here is understood to be, in particular, the minimum distance (which should usually be defined by a vertical line between the distal or proximal end of the locking device and the outer surface of the frame member).Preferably, the locking device projects at least 1 cm, and more preferably at least 3 cm, further than in the second position. Alternatively or additionally, the frame part can project at least 30%, preferably at least 60%, and even more preferably at least 90%, or possibly 100%, less than in the first position.

[0028] The contact of the locking device in the second position with the first frame part is to be understood in particular as a flat contact; if necessary, the locking device may be flush with a surface of the frame part.

[0029] The locking device (or its movable part) can be an elongated element, particularly in the sense that its longitudinal extent is at least twice, preferably at least four times, its lateral extent (transverse to the longitudinal direction). For example, the locking device (or its movable part) can be designed as a lever or at least lever-like, in particular snap-lever-like.

[0030] The first position of the locking device is a functional position, in particular such that a lock exists or can be established in the first position (preferably without any further change in the position of the locking device beyond the actual locking process, such as snapping or latching). The second position of the locking device is a rest position, in particular such that no lock exists or can be established in the second position (which means, in particular, that a lock is structurally or geometrically impossible, even if the two frame parts are in a position in which they are actually intended to be locked, assuming this is even possible independently of the change in position of the locking device).

[0031] In some embodiments, the locking device is pivotable. In this case, the angle between the locking device (or its pivotable part) and the first frame part is preferably greater in the first position than in the second position, for example by at least 10°, preferably at least 30°, optionally at least 60° or (at least approximately) 90° or greater. This allows for easy adjustment to a relatively flat position of the locking device.

[0032] In further embodiments, the locking device can be displaceable (at least partially or partially translationally movable), wherein the distance between a distal end of the locking device and the first frame part is preferably greater in the first position than in the second position. Preferably, the distance in the second position is at least 10%, more preferably at least 30%, even more preferably at least 80%, and possibly (at least approximately) 100% less than the distance in the first position.

[0033] The first frame part can form at least part of a push handle or a wheel stay (of a wheel leg), in particular a rear wheel stay (rear wheel leg) or a front wheel stay (front wheel leg). Alternatively or additionally, the second frame part can form at least part of a push handle or a wheel stay, in particular a rear wheel stay (rear wheel leg) or a front wheel stay (front wheel leg). In other embodiments, the first frame part and / or the second frame part can form an intermediate or connecting strut of the stroller frame.

[0034] Preferably, the first and second frame parts are not parts of the same element. For example, the second frame part is not also part of a sliding stem (or a specific strut, such as a wheel stay, intermediate strut, or connecting strut) if the first frame part is part of a sliding stem (or the specific strut) (although this can be the case, as explained above). Particularly preferably, the first frame part is a wheel stay (rear wheel stay) and the second frame part is a sliding stem (or part thereof).

[0035] Preferably, the locking device (or a connection point / connection area thereof vis-à-vis the frame part) is arranged in the vicinity of a folding joint between the first and second frame part, in particular at a distance of less than 30 cm, more preferably less than 15 cm to this folding joint or an axis of rotation (which defines the rotation or pivoting between the first and second frame part).

[0036] In a specific embodiment, the locking device (particularly at its distal end) can have a locking element (preferably tapered and / or chamfered and / or snap-in), in particular a hook. The locking element (the hook) can, in particular, be a snap-in device in which locking is achieved by snapping the locking element or the hook into place. This allows for simple locking.

[0037] A second locking device can be arranged on the second frame member, preferably interacting with the first locking device (or alternatively, acting separately from it). The second locking device can be immovable relative to the second frame member (for example, rigidly attached to it, possibly in a non-releasable manner). The second locking device preferably protrudes only slightly (or not at all) from the second frame member, for example, by less than 2 cm or less than 1 cm. Alternatively or additionally, the locking device can optionally interact directly with the second frame member or be configured accordingly.

[0038] The first locking device can protrude from the first frame part by at least 2 cm, preferably at least 4 cm (in at least one, in particular the first position).

[0039] In some embodiments, the joint between the first and second frame parts can also form a joint for folding a third frame part. In alternative embodiments, a further joint can be provided, allowing a third frame part to be folded relative to the first and / or second frame part, with the further joint preferably being located in close proximity to the joint between the first and second frame parts. Close proximity means, in particular, that the axes of rotation defined by the joints are less than 10 cm apart, preferably less than 5 cm apart. However, the axes of rotation may also be separated by a greater distance (for example, greater than 10 cm or greater than 20 cm).

[0040] A joint can have an arc contour, in particular a crescent contour, along which it is preferably connected to the first and / or the second frame part. This allows the joint to preferably also (at least partially) form a receiving device for a seating and / or lying unit.

[0041] The first locking device is designed to be pre-tensioned by a spring mechanism in at least one position (especially the second position, and possibly alternatively or additionally in the first position). This allows for a simple return to at least one of the two positions. The reverse movement can then be achieved, for example, by a suitable ramp and / or guide, or at least assisted by one.

[0042] In general, it is preferred that the positioning device comprises at least one guide, in particular a sliding device, preferably a ramp and / or cam guide and / or rail guide, preferably such that a folding operation automatically results in a position transition. This allows for a simple implementation of a position transition. According to the embodiment, the guide device (in particular a ramp and / or cam guide) can be at least partially provided as part of a third frame section or be (rigidly and / or directly) connected to a third frame section to enable the transition from the first position to the second position (or vice versa).

[0043] The first locking device may be at least partially removable.

[0044] Alternatively or additionally, the first locking device can be at least partially housed in a casing or be capable of being housed in at least one position, in particular the second position (rest position). Alternatively or additionally, the first locking device can be at least partially recessed or recessable within the first frame part. For example, in the second position, the first locking device can be partially (preferably at least 50% by volume, more preferably at least 90% by volume) or completely recessed within the first frame part.

[0045] The above-mentioned problem is further solved by a method according to claim 17.

[0046] A method for folding and / or unfolding a stroller frame, preferably of the type above, is also disclosed, comprising the steps: Folding or unfolding a first frame part relative to a second frame part; locking or unlocking a folding position between the first and second frame parts by means of a locking device arranged on the first frame part and moving the locking device from a first position to a second position in relation to the first frame part, the temporal order of the steps is not necessarily fixed (but can optionally be fixed by the order mentioned above).

[0047] Further procedural characteristics result from the above description, in particular the explained functional characteristics) of the pram frame or pram.

[0048] Overall, a visually clean and tidy solution can be achieved for locking the folding position of a stroller frame. Ideally, at least some degree of safety is provided against accidental breakage or similar damage. Operation is particularly self-explanatory and intuitive.

[0049] Overall, a simple and practical solution is proposed, ensuring in particular a secure hold for the storage solution. Additional release mechanisms (components), such as a pedal, can be omitted where necessary, leading to further cost and weight savings. In general, tedious (manual) steps by the user can be reduced.

[0050] A standing (possibly lockable) storage position may be provided, which allows the user a one-handed, standing transport and carrying position (for example as described in DE 10 2014 110 215 A1).

[0051] There may be exactly one or more locking devices provided, or at least one corresponding first locking device may be provided on one side, possibly on both sides.

[0052] Any locking device provided may include a (e.g., pre-tensioned) pin (instead of or in addition to a hook).

[0053] Electrical and / or mechanical and / or acoustic indicators may be provided, which, for example, indicate a locked position (e.g., by a clicking sound).

[0054] In general, according to the invention, a locking element (hook) can be rotated from a rest position to a functional position by means of a sliding ramp fixed to the joint. The locking element can be rotated from a (substantially) parallel position to the frame section to a (nearly) perpendicular position to the frame section. The functional position can be reached automatically upon completion of the folding process. The locking element (hook) can, for example, be pre-tensioned by a spring. An upper end of the locking element (e.g., the hook head) can be chamfered such that the hook automatically slides over the protruding counterpart and thus reaches its actual functional position. A sliding ramp can have a wedge-shaped section pointing towards the locking element.

[0055] The operating position of the stroller frame (unfolded position) can be identified by the fact that the front and rear legs (front and rear wheel stays) are at their maximum distance from each other. A section of the handlebar may form a (nearly) parallel line with the front stay (front leg). In this case, the locking mechanism may not be engaged and may remain in a resting position. A rigid locking element (sliding ramp) may force a movable locking element (hook) into a spring-loaded, pre-tensioned position. A movable locking element (hook) may be in a pre-tensioned position. A rigid locking pin may be located at the furthest point (for example, on the handlebar section).

[0056] In the storage position (folded position of the stroller frame), the handlebar section, front and rear legs (front and rear wheel stays) can be positioned at a minimal distance from each other or (almost) maximally towards each other, with an additional intermediate position also being conceivable. The locking mechanism can be engaged and remain in a functional position. A rigid locking element (sliding ramp) can be displaced and / or rotated in such a way that a movable locking element leaves (or can leave) its pre-tensioned position and is exposed. The movable locking element (hook) can leave its pre-tensioned position and protrude. A rigid locking pin can be located at the nearest point, preferably in engagement with the movable locking element.

[0057] A procedure for folding a stroller frame into a storage position can proceed as follows. First, the folding process can be initiated by releasing any locking mechanisms that secure the frame in its operating position. A push bar can then be pushed or slid towards a (lower) leg section. Subsequently, or at least partially overlapping, an upper push bar unit can be pivoted towards a rear leg section. This can be accompanied by a rotational movement of a joint (between the first and second frame sections), so that, for example, a sliding ramp rotates automatically. A spring mechanism can assist in displacing or rotating a locking hook (into its first position or locking position), extending the locking hook until it finally reaches the first position (locking position).(snaps into this position). When returning to the second position, the spring mechanism can then be re-tensioned. Alternatively (or additionally, e.g., if another spring mechanism is provided), the movement of the safety hook to the second position can be assisted by the spring force of a spring mechanism, which is then tensioned, if necessary, when returning to the first position.

[0058] Further embodiments of the invention are set out in the dependent claims.

[0059] The invention is described below using an exemplary embodiment, which is explained in more detail with reference to the figures. These show: Fig. 1 a front view of a pram frame according to the invention; Fig. 2 a section along line II-II in Fig. 1 ; Fig. 3 a representation according to Fig. 2 with further details; Fig. 4 an enlargement of section A in Fig. 3; Fig. 5 shows a section of the pram frame according to the invention. Fig. 1 in an oblique view (partial exploded view); Fig. 6 an enlarged view of section B in Fig. 5 ; Fig. 7 a section of the pram frame according to Fig. 1 in a front view; Fig. 8 the section according to Fig. 7 along section line VIII-VIII in Fig. 7 ; Fig. 9 a representation analogous Fig. 8 with further details; Fig. 10 an enlarged view of section C in Fig. 9 .

[0060] In the following description, the same reference numbers are used for identical and equivalent parts.

[0061] Fig. 1Figure 1 shows a pram frame according to the invention. This frame has a push handle section 10, two push handle shafts 11 (each also called a second frame part), two rear wheel stays 12 (each also called a first frame part), two front wheel stays 13 (each also called a third frame part), and two rear wheels 27 and front wheels 28. The respective push handle section 11, the respective rear wheel stay 12, and the respective front wheel stay 13 are connected via a joint 14 (see also Figure 1). Fig. 2 ) are connected to each other by a joint. The joint 14 has an arc-shaped or crescent-shaped section 15 in which, for example, a seat and / or reclining unit can be accommodated.

[0062] The slide section 10 is pivotally connected to the two slide shafts 11 by a slide joint 16.

[0063] Insofar as the following describes a hinged connection between each slider section 11 (in this embodiment: second frame part) and each rear wheel strut 12 (in this embodiment: first frame part), the descriptions can apply to both pairs of slider sections 11 and rear wheel struts 12, or only to one pair. While the embodiment generally provides for a double configuration of slider section 11 or rear wheel strut 12 (or front wheel strut 13), this is not mandatory. Therefore, this double configuration is only optional in the following explanations. Furthermore, all subsequent explanations of the hinged connection (or folding mechanism) apply to both pairs.The flapping mechanism of sliding section 11 relative to rear wheel stay 12 also applies generally to the case where sliding section 11 is (any) second frame part and rear wheel stay 12 is (any) frame part. Therefore, the specific design as sliding section 11 or rear wheel stay 12 is again only optional.

[0064] As in the Figs. 1-4 As can be seen, the rear wheel strut 12 has a locking device 17 (see in particular Fig. 4 ) assigned, which is pivotably mounted relative to the rear wheel strut 12 about a rotational axis 18 (see Fig. 4 This allows the locking device 17 to be moved from its position according to Figs. 3 and 4 into the position according to Figs. 9 and 10 can be pivoted. Specifically, the locking device 17 comprises a hook 19 with a corresponding recess 20. This allows the hook 19 (via the recess 20) to engage with a pin 21 (see Fig. 10) are brought to the slide shaft 11.

[0065] As can be seen, the locking device 17 (or the hook 19) is located in Fig. 4 (the frame's operating position) on the rear wheel strut 12, in Figs. 9 and 10 (in the transport position of the frame) it stands away from the rear wheel strut 12.

[0066] One in Figs. 5 and 6 The spring assembly 22 shown is configured and arranged such that it prevents rotation of the locking device 17 from its position according to Fig. 10 into the position according to Fig. 4 counteracts (or supports or causes the reverse rotation). Starting from the position according to Fig. 4 A position transfer device 29, comprising a ramp 23, forces the locking device 17 in the direction of the position according to Fig. 10(by means of the spring force of the spring assembly 22), so that the locking device 17, in the folded state (via recess 20 and pin 21), can achieve a locking action between shaft section 11 and rear wheel stay 12. The ramp 23 is here (which is not strictly necessary) rigidly connected to the associated front wheel stay 13 (the third frame part).

[0067] In the state according to Fig. 10 The locking device 17 is in a locked position. Rear wheel strut 12 and slide shaft 11 are locked against each other. To release the lock, a distal end 24 of the locking device 17 can now be (see Fig. 10 ) are moved away from pin 21 (e.g., manually) so that the stroller frame can then be unfolded again. This tensions the spring mechanism 22 and restores the locking mechanism 17 to its position according to Fig. 4 a.

[0068] As from Fig. 6 It can be seen that (releasable) fastening devices 25 (e.g., screws) can be provided to attach the locking device 17 (releasably) to the first frame part (rear wheel stay). However, this feature is only optional. Specifically, an intermediate element 26 (intermediate plate) can be provided, to which the locking device 17 is attached or can be attached, and this intermediate element 26 can be attached to the rear wheel stay 12 via the fastening device 25 in such a way that it is not rotatable.

[0069] If necessary, an intermediate element 26 can be arranged on the spring assembly 22, specifically between the rear wheel strut 12 and the locking device 17 (see Fig. 6 This allows the locking device 17 to be easily removed from the rear wheel strut 12 (for example, if locking in the transport position is not desired). Reference symbol list

[0070] 10 Slider section 11 Slider shaft (second frame part) 12 Rear wheel strut (first frame part) 13 Front wheel strut (third frame part) 14 Joint 15 Arc-shaped section 16 Slider joint 17 Locking device 18 Rotation axis 19 Hook 20 Recess 21 Pin 22 Spring device 23 Ramp 24 Distal end 25 Fastening device 26 Intermediate element 27 Rear wheel 28 Front wheel 29 Positioning transfer device

Claims

1. Push chair frame (1), which is reversibly transferable from a first frame position, namely an unfolded position, into a second frame position, namely a folded position, comprising a first frame part (12) and a second frame part (11), which are foldable against one another, a first locking device (17), arranged on the first frame part (12), for locking a folded position of the first frame part (12) relative to the second frame part (11), and a position transfer device (29) for transferring the first locking device (17) from a first position in relation to the first frame part (12) into a second position, which is different therefrom, in relation to the first frame part (12), wherein the first position of the locking device (17) is a functional position, in which the locking device (17) is engaged, wherein the second position of the locking device (17) is an idle position, in which the locking device (17) is not engaged, wherein, when the push chair frame is in the folded position, the locking device (17) is in the first position, and, when the push chair frame is in the unfolded position, the locking device (17) is in the second position.

2. Push chair frame (1) according to claim 1, characterized in that the position transfer device (21) is configured such that a position transfer of the locking device (17) takes place automatically, preferably by means of a mechanical coupling between at least one frame part (12, 13) and the position transfer device (29), when unfolding and / or folding of the two frame parts (11, 12) takes place.

3. Push chair frame according to claim 1 or 2, characterized in that the locking device (17) protrudes from the first frame part (12) in the first position and / or abuts the second frame part (11) or does not protrude as far as in the first position in the second position.

4. Push chair frame according to any one of the preceding claims, characterized in that the first position of the locking device (17) is a functional position, preferably such that in the first position a locking function is present or producible, and / or the second position of the locking device (17) is an idle position, preferably such that in the second position no locking function is present or producible.

5. Push chair frame according to any one of the preceding claims, characterized in that the locking device (17) is pivotable, wherein an angle between locking device (17) and first frame part (12) is preferably greater in the first position than in the second position.

6. Push chair frame according to any one of the preceding claims, characterized in that the locking device (17) is displaceable, wherein a distance between a distal end (24) of the locking device (17) and the first frame part (12) is preferably greater in the first position than in the second position.

7. Push chair frame according to any one of the preceding claims, characterized in that the first frame part (12) forms one of the group consisting of: a part of a push bar shaft or a rear wheel strut or a front wheel strut; and the second frame part (11) forms a different one of the group consisting of: a part of a push bar shaft (11) or a rear wheel strut or a front wheel strut.

8. Push chair frame according to any one of the preceding claims, characterized in that the locking device (17) is arranged in the vicinity of a folding joint between first (12) and second (11) frame part, in particular has a distance of less than 20 cm, preferably less than 10 cm, to this folding joint.

9. Push chair frame according to any one of the preceding claims, characterized in that the locking device (17) has, in particular at its distal end, a, preferably tapering and / or chamfered, locking device, in particular a hook (19).

10. Push chair frame according to any one of the preceding claims, characterized in that a second locking device is arranged on the second frame part (11), which preferably interacts with the first locking device (17) and / or is immovable in relation to the second frame part (11), and / or the first locking device (17) interacts directly with the second frame part (11).

11. Push chair frame according to any one of the preceding claims, characterized in that a / the joint (14) between first (12) and second (11) frame part at the same time also forms a joint for folding a third frame part (13) or a further joint is provided, via which a third frame part (13) is foldable in relation to the first (12) and / or second frame part (11), wherein preferably the axes of rotation defined by the further joint and the joint between first (12) and second (11) frame part have a distance to one another which is less than 10 cm.

12. Push chair frame according to any one of the preceding claims, characterized in that a / the joint has a curved contour, in particular a sickle contour, along which it is preferably connected to the first (12) and / or the second (11) frame part.

13. Push chair frame according to any one of the preceding claims, characterized in that the first locking device (17) is pre-tensioned by a spring device (22) at least in one position.

14. Push chair frame according to any one of the preceding claims, characterized in that the position transfer device (29) comprises at least one guiding device, in particular a sliding device, preferably a starting inclination and / or link guide and / or rail guide, preferably such that a folding procedure automatically results in a position transfer.

15. Push chair frame according to any one of the preceding claims, characterized in that the first locking device (17) is at least partially removable and / or is or can be at least partially housed in a housing as / or is or can be at least partially countersunk within the first frame part.

16. Push chair having a push chair frame according to any one of the preceding claims.

17. Method for folding a push chair frame according to any one of claims 1 to 15, comprising the following steps: - folding the first frame part (12) in relation to the second frame part (11) to bring the push chair frame into a folded position, and - locking the folded position between the first (12) and the second (11) frame part by means of the locking device (17) arranged on the first frame part (12), and - transferring the locking device (17) from the second position into the first position in relation to the first frame part (12).