CN112867657A

CN112867657A - Device for transporting children

Info

Publication number: CN112867657A
Application number: CN201880098713.2A
Authority: CN
Inventors: F·J·C·德里斯森
Original assignee: Mutsy BV
Current assignee: Matesi World Co ltd
Priority date: 2018-09-20
Filing date: 2018-09-20
Publication date: 2021-05-28
Also published as: EP3853104A1; IL281688A; WO2020060391A1

Abstract

The invention relates to a device (1) for transporting a child, such as a pushchair or buggy. More particularly, the present invention relates to a device for transporting a child that can be folded into a compact unit. According to the invention, the lower frame (10) of the device comprises a first lower frame portion (11) to which front wheels (61) are mounted and a second lower frame portion (12) to which rear wheels (60) are mounted, wherein the first and second lower frame portions (11, 12) are hingedly connected to each other, wherein the pusher (30) of the device comprises a first and a second pusher portion which are hingedly connected to each other, and wherein in the folded position the second lower frame portion (12) has been pivoted away from the pusher (30) and towards the front wheels (61) and the second pusher portion has been pivoted towards the lower frame (10) such that the second pusher portion is placed adjacent to the second lower frame portion (12).

Description

Device for transporting children

According to a first aspect, the invention relates to a device for transporting a child, such as a pram or buggy. More particularly, the present invention relates to a device for transporting a child that can be folded into a compact unit.

Devices for transporting children according to the preamble of claim 1 are known in the art. These devices generally comprise a lower frame and an upper frame, which are hingedly connected to each other to allow the device to be adjusted between a use position and a folded position, wherein the lower frame comprises front and rear wheels. Several different configurations are known, such as a device with a single swivel wheel at the front and two rear wheels, or a device with two swivel wheels at the front and two rear wheels, or a device with two front wheels and two rear swivel wheels. It should be noted that the present invention relates to all of these configurations, but particularly to four-wheel configurations. Moreover, the position of use corresponds to the normal configuration of the device for transporting a child.

An important aspect of these foldable devices is the amount of space they occupy when in the folded position.

Therefore, according to a first aspect, it is an object of the present invention to provide a foldable device for transporting children that takes up less space.

The object has been achieved by a device according to claim 1, characterized in that: the lower frame comprises a first lower frame portion to which the front wheels are mounted and a second lower frame portion to which the rear wheels are mounted, wherein the first lower frame portion and the second lower frame portion are hingedly connected to each other, wherein the pusher comprises a first pusher portion and a second pusher portion which are hingedly connected to each other, and wherein in the folded position the second lower frame portion has been pivoted away from the pusher and towards the front wheels and the second pusher portion has been pivoted towards the lower frame such that it is placed adjacent to the second lower frame portion. Optionally, the front or rear wheels may be configured as a swivel wheel.

In contrast to prior art devices, the lower frame according to the first aspect of the invention comprises a hinge dividing the lower frame into hingedly connected frame parts. The pushers achieve a similar division between the sections. Thus, the length of the folding device (usually defined by the distance between the front wheel and the end of the pusher or the distance between the front wheel and the rear wheel, whichever is greater) is now becoming smaller. According to a first aspect of the invention, the length of the folding means is determined by the distance between the front wheel and the hinge between the first pusher section and the second pusher section.

In the folded position, the second lower frame portion and the second pusher portion may extend in substantially the same direction. Additionally or alternatively, the second pusher portion is placed against the second lower frame portion in the folded position.

In the folded position, the hinge between the second lower frame portion and the first lower frame portion may be arranged within a triangle defined by points corresponding to the hinge between the upper frame and the lower frame, the hinge between the first pusher portion and the second pusher portion, and an end of the second pusher portion, when viewed from the side. Therefore, when viewed from the side, the hinge between the first lower frame portion and the second lower frame portion is confined between the second pusher portion and the hinge between the upper frame and the lower frame. Here, it should be noted that the second lower mount section may preferably not restrict the rotation of the first and second pusher sections. For example, the second lower frame portion may comprise two parallel tubes between which the second pusher portion is pivotable.

The second pusher portion and the second lower frame portion may each pivot through an angle greater than 60 degrees, preferably greater than 75 degrees, when changing between the use position and the folded position.

The device may further comprise a first lock for locking the second pusher section relative to the first pusher section in at least a first pusher position corresponding to the use position of the device and a second pusher position corresponding to the folded position of the device. The device may further comprise a first operating element, such as a button, for operating the first lock. The first lock may for example comprise: a gear movably connected to one of the first and second pusher portions; and a gear housing coaxially disposed with the gear along a rotational axis corresponding to rotation between the first and second pusher portions. The axis of rotation may correspond to a shaft passing through the center of the gear or connected to the center of the gear. The gear housing may be fixedly connected to the other of the first and second pusher portions. It may comprise teeth for engaging with a gear. For example, the gear and the inner wall of the gear housing may be provided with complementarily shaped teeth.

By operating the first operating element, the gear may be translated along the rotational axis so as to disengage or engage the gear housing, respectively releasing or blocking the pivotal movement of the second pusher portion relative to the first pusher portion. The use of the above-described structure with complementary teeth allows the first pusher part and the second pusher part to be arranged in a plurality, preferably more than two, different mutual orientations. Thus, the user may conveniently select a desired position of the second pusher portion relative to the first pusher portion based on the user's height or other preferences.

The device may further comprise a second lock for locking the second lower frame portion in at least a first lower frame position relative to the first lower frame portion corresponding to the use position of the device. For example, at the first lower frame position, the first lower frame section and the second lower frame section are placed in substantially the same plane.

The second lock may also be configured to lock the second lower frame portion in a second lower frame position relative to the first lower frame portion corresponding to a folded position of the device. This allows the two lower frame sections to become locked after unlocking when the device is folded.

The second lock may comprise one of a receiving element and an engaging element arranged in the second lower frame portion and the other of a receiving element and an engaging element arranged in the first lower frame portion. The second lock may additionally comprise a second operating element for operating the second lock, wherein the second operating element is configured to bring the receiving element and the engaging element into or out of engagement in order to lock or unlock the second lock, respectively.

Additionally or alternatively, the second lock may be further configured to lock the second lower frame portion in a second lower frame position relative to the first lower frame portion corresponding to a folded position of the device. For example, at the second lower frame position, the first lower frame portion and the second lower frame portion may be positioned at an angle between 60 degrees and 120 degrees when compared to the first lower frame position.

The engagement element may be arranged in the second lower frame portion and the first lower frame portion may comprise a further engagement element to allow the first and second lower frame portions to be locked when the second lower frame portion is in the second lower frame position. Additionally or alternatively, the engagement element may comprise a pin and the receiving element and/or other receiving elements may comprise a hole. Here, the engagement element may be spring biased to urge the engagement element to engage the receiving element.

The apparatus may further include a brake for blocking the rear wheel and a brake operating member for operating the brake. The brake operating element and the second operating element may be coupled such that the act of operating the second operating element is mechanically coupled to the act of operating the brake operating element such that the act of unlocking the second lock will automatically block the rear wheel and such that blocking and unblocking the rear wheel can be performed independently of locking or unlocking the second lock when the device is in the use position. Such mechanical couplings provide an additional measure of safety such that the rear wheels are automatically locked during folding of the device to prevent accidental movement of the device during folding.

It is possible to make it possible to overcome the locking force for locking the second lower frame portion in the second lower frame position by the user pushing the means forward in the position of the means in which the upper frame portion and the pusher have been brought into the position corresponding to the use condition. Thus, when deploying the device, the user will first pivot and/or bring the upper frame and the second pusher section to a position corresponding to the use position of the device. Then, while the rear wheels are still locked and the second lower frame portion is still pivoted, the user can push the device forward. Due to the fact that the rear wheel is still locked, a rearward force will be exerted on the rear wheel, which will disengage the engagement element from the other receiving element. Therefore, the second lower frame section will be pivoted rearward until the second lower frame section is locked by the engagement member engaging the receiving member. Thereafter, the user may operate the brake operating member to unlock the rear wheels so that the user may begin walking using the device.

The second operating element and the brake operating element may both be paddle-shaped and may be arranged adjacently, wherein the second operating element and the brake operating element may respectively perform the actions of unlocking the second lock and blocking the rear wheel when pushed in the first direction, wherein the second operating element may partially protrude above the brake operating element when viewed in the first direction. For example, the first direction may correspond to a vertically downward direction. In this case, the second operating element may have a projecting edge projecting above the brake operating element. When the second operating member is operated to unlock the second lock, the rear wheels are locked substantially simultaneously.

The upper frame may include a pair of upper frame tubes, and the first pusher portion may include a pair of first arms, and the second pusher portion includes a pair of second arms, each first arm being received in a respective upper frame tube and hingedly connected to a respective one of the second arms. Additionally or alternatively, the first lower frame portion may comprise a pair of first lower frame tubes and the second lower frame portion comprises a pair of second lower frame tubes, wherein each first lower frame tube is hingedly connected to a respective second lower frame tube. In the folded position, the second lower frame tube may be substantially parallel to the second arm. Further, each first lower frame tube may be hingedly connected to a respective upper frame tube.

According to a second aspect, the invention relates to a device for transporting a child, such as a pram or buggy. These devices generally comprise a lower frame to which the front and rear wheels are mounted, wherein the lower frame comprises a pair of first tubes. These devices also include an upper frame that includes a pair of second tubes. Additionally, the device may include a pusher telescopically received in the upper frame, wherein the pusher includes a pair of third tubes. In these devices, each third tube is telescopically received in a respective second tube, wherein each second tube is hingedly connected to a respective first tube, in order to adjust the device to a folded position or a use position.

In order to maintain the device stable during use, the known device further comprises a pair of connecting members, each connecting a respective first tube to a respective second tube. A locking system is provided, operable by a respective end section of the third tube. The locking system is configured to lock the pivotal movement of the upper frame relative to the lower frame. In the prior art devices, each connecting member has one end thereof slidably mounted in the corresponding second tube or the corresponding first tube. The corresponding sliding movement is locked by a locking system. When the locking system releases the sliding movement, the upper frame may rotate relative to the lower frame and the stroller may be folded.

Such known connection members may not be aesthetically appealing to all users. Furthermore, when the connecting member is made of one piece and slidably mounted in the respective second tube or the respective third tube, the space required for bringing the connecting member into the folded state is considerable. Furthermore, the slidably mounted connecting member is relatively sensitive to tolerances that cause movement of the pusher.

According to a second aspect, it is an object of the present invention to provide a solution to at least one of these problems.

According to a second aspect of the invention, the object is achieved by an apparatus according to claim 21, comprising a lower frame to which front and rear wheels are mounted, wherein the lower frame comprises a pair of first tubes. The device further comprises: an upper frame including a pair of second tubes; and a pusher telescopically received in the upper frame, wherein the pusher includes a pair of third tubes. The device further comprises: a locking system operable by respective end sections of the third tube, the locking system locking pivotal movement of the upper frame relative to the lower frame; and a pair of connecting members, each connecting a respective first tube to a respective second tube.

Each third tube is telescopically received in a respective second tube, and each second tube is hingedly connected to a respective first tube for adjusting the device to a collapsed position or a use position.

The device according to the second aspect of the invention is characterized in that the device further comprises a pair of connection member housings, each connection member housing being fixedly arranged to the outside of a respective second tube, wherein each connection member comprises a first part hingedly connected to the respective connection member housing and a second part hingedly connected to the respective first tube, wherein the first part and the second part are hingedly connected. Furthermore, the locking system is configured to release the pivoting movement of the connection member with respect to the connection member housing and lock the third tube with respect to the second tube when the penetration depth of the third tube in the respective second tube is equal to a first threshold value, and to allow the connection member to resume the locked state with the connection member housing and lock the third tube with respect to the second tube when the penetration depth of the third tube in the respective second tube is equal to a second threshold value different from the first threshold value.

According to the second aspect of the invention, when the user wishes to fold the device, the user pushes the pusher downward in the second tube and unlocks the pivotal movement of the link member relative to the link member housing. When unlocking the pivoting movement, the third tube must be locked inside the second tube in order to provide sufficient stability. However, if this state continues and the user wishes to lock the connecting member again, for example because the user wishes to adjust the device from the folded position to the use position, the user is faced with the problem that the connecting member cannot be locked because the third tubes are still in a position in which they unlock the pivoting movement. The present invention solves the problem by allowing the connection member to return to a state of being locked with the connection member housing and locking the third tube with respect to the second tube when the penetration depth of the third tube in the corresponding second tube is equal to a second threshold value different from the first threshold value. Thus, locking of the second tube relative to the third tube is achieved at two different penetration depths. At the first penetration depth, the pivoting movement is unlocked. At the second penetration depth, locking may again be achieved. Here, it is important to note that at the second penetration depth, the connecting members need not yet be in a position where they can be locked. For example, the user may still have to pivot the connecting member. Further, the effect of pivoting the connecting member is achieved by pivoting the upper frame relative to the lower frame.

The locking system may be further configured to unlock the third tube relative to the second tube and move or allow movement of the third tube such that the depth of penetration of the third tube in the respective second tube is equal to a second threshold when the depth of penetration of the third tube in the respective second tube is equal to the first threshold and the connecting member pivots after release of the pivoting movement. Such movement is facilitated, for example, when each third tube is spring biased to move in a direction away from the respective second tube to enable movement from a first penetration depth to a second penetration depth. In such cases, the user must apply a downward force to overcome the spring biasing force in order to push the pusher further into the second tube. However, the spring biasing force also allows the third tube to automatically move to the second penetration depth after unlocking.

Preferably, the second penetration depth is less than the first penetration depth. However, by applying a downwardly directed spring biasing force, a second penetration depth greater than the first penetration depth will also be possible.

In the use position, each connecting member is preferably in a first position relative to the connecting member housing, and in the folded position, each connecting member may be in a second position relative to the connecting member housing.

The locking system may be configured to release the pivotal movement of the connecting member relative to the connecting member housing and lock the third tube relative to the second tube when the penetration depth of the third tube in the respective second tube is equal to a first threshold and when the connecting member is in the first position. Thus, it is possible to release the pivotal movement at the first penetration depth only when the connecting member is in the first position.

The locking system may be configured to release the locking of the third tube relative to the second tube once the connecting member returns to the first position. This will allow the user to pull the pusher up to the desired position without having to operate another operating element.

To achieve at least part of the above functionality, the locking system may comprise a first pin arranged in the first cavity for each connecting member housing, wherein the first pin is spring biased to penetrate a corresponding first opening in the second tube. The locking system may further comprise a second pin disposed in a second cavity for each connecting member, wherein the second pin is spring biased to penetrate the respective first cavity when the connecting member is in the first position. In this case, when the penetration depth of the third tube in the respective second tube is equal to the first threshold value, the second pin is removed from the first cavity using the first pin by the end section engaging the first pin and pushing the second pin out of the first cavity.

The interface of the second pin and the first pin may coincide with the interface between the connecting member and the connecting member housing immediately after the second pin is pushed out by the first pin. For example, a first pin in a given connecting member housing may push a corresponding second pin out of a first cavity. In this case, the first pin may be fully received in the connecting member housing and the second pin may be fully received in the second cavity of the adjacent connecting member. This allows the connecting member to pivot relative to the connecting member housing, since there is no longer a second pin preventing such movement.

The locking system may further comprise: a third cavity spaced apart from the second cavity in each connecting member; and a third pin disposed in the fourth cavity for each connecting member housing, wherein the third pin is spring biased to penetrate a respective second opening in the second tube or into a respective third cavity. Furthermore, when the connecting member is in the first position and the penetration depth of the third tube in the respective second tube is equal to a second threshold value, the walls of the third chamber engage the third pins so that they penetrate the second opening in order to lock the third tube with respect to the second tube. Also, when the connecting member is moved away from the first position, the third pin penetrates the third lumen and is unable to lock the third tube relative to the second tube.

While the first and second pins perform the functions of unlocking and locking the pivotal movement, the third pin performs the first function of locking the third tube relative to the second tube.

In order to enable a second function of locking the third tube at different penetration depths with respect to the second tube, the locking system may comprise: a fifth cavity in each connecting member; and a fourth pin disposed in the sixth cavity of each connecting member housing, wherein the fourth pin is spring biased to penetrate into the fifth cavity. When the connecting member is pivoted away from the first position, the cavity walls of the fifth lumen engage the fourth pins and push the pins through the third openings in the second tube to lock the third tube relative to the second tube. In addition, the locking system may be configured such that when the connecting member returns to the first position, the fourth pins are retracted from the second tube and each pin penetrates the respective fifth cavity, so that the third tube cannot be locked relative to the second tube. In this way, the user can pull the pusher without having to operate a further operating element.

The fifth lumen may merge with the third lumen. In such cases, different side walls of the cavity may operate with different pins.

According to a third aspect, the invention relates to a device for transporting a child, such as a pram or buggy.

Devices for transporting children, such as strollers or strollers, are known in the art. Such devices generally comprise a lower frame to which the front and rear wheels are mounted, and an upper frame comprising a pair of tubes. These devices also include a pusher comprising a pair of tubes, wherein each tube in the pusher is received in a corresponding tube in the upper frame. The pusher is telescopically adjustable relative to the tube of the upper frame.

Some devices known in the art are foldable between a folded position and a use position. The process of folding the device includes pushing the pusher as far as possible in the upper frame to reduce the length of the device in the folded position.

It is desirable to obtain a very compact unit after folding the device for easy transport and storage. The compactness of such a unit depends on the length of the tubes of the upper frame. However, the length of these tubes cannot be reduced at will, due to the fact that the telescopic function of the pusher requires a certain length and that the pusher in its most extreme position must also allow for convenient use by taller persons. Thus, the height requirements for the pusher are contradictory requirements with the requirements for compact foldability.

According to a third aspect, it is an object of the present invention to provide a solution to said problem.

The object has been achieved by a device for transporting children according to claim 34, comprising: a lower frame to which front and rear wheels are mounted; and an upper frame including a pair of first tubes and a pair of second tubes, wherein each second tube is received in a corresponding first tube. The device also includes a pusher including a pair of third tubes, wherein each third tube is received in a respective second tube. The pusher is telescopically adjustable relative to the second tube, and the second tube is slidably received in the first tube. Further, the first tube, the second tube, and the third tube form a pair of telescopically adjustable tube arrangements. At least one of the adjustable tube arrangements comprises a first locking system for locking an associated third tube to an associated second tube and a second locking system for locking an associated second tube to an associated first tube, wherein the associated third tube comprises an end section received in the associated second tube. Furthermore, the second locking system may be operated by engagement with an end section of the associated third tube.

Here, the expression "associated first tube", "associated second tube" or "associated third tube" indicates, respectively, a first tube, a second tube or a third tube, which is part of a specific adjustable tube arrangement.

According to a third aspect of the invention, the at least one adjustable tube arrangement further comprises a mounting adapter mounted to the exterior of the associated first tube, wherein the mounting adapter is configured to receive a support device for a child, such as a child seat or a crib, the device further comprising a third locking system configured to limit the penetration depth of the third tube in the first tube to a first predetermined position such that it cannot engage the second locking system, wherein the third locking system is configured to release the third tube such that the support device is at least partially folded when mounted to the mounting adapter when removed from the mounting adapter or if the support device is adjustable between a folded position and a use position.

For example, the support device may be a foldable child seat. When the child seat is at least partially folded, the penetration depth of the third tube is no longer limited to the first predetermined position, thereby allowing further penetration of the third tube into the third tube to operate the second locking system.

The use of the third locking system in combination with the second locking system provides a device in which the user cannot push the pusher beyond the first predetermined position in the event that a child may still be positioned in the support device, while still allowing the adjustable tube arrangement to be in a collapsed state of small size.

The second locking system may also be configured to lock the associated third tube to the associated second tube.

The first locking system may allow the associated third tube to be locked to the associated second tube at a plurality of different positions along the second tube. This allows the user to select a desired height of the pusher.

Preferably, the second locking system may only be operated when the third tube has passed a final position where it can still be locked to the second tube using the first locking system.

The associated third tube and the second tube may be configured such that the associated third tube cannot penetrate further into the associated second tube upon or near operation of the second locking system through the end section of the associated third tube. This provides a facility so that the user can push the associated second and third tubes as a single unit when operating the second locking system.

The associated third tube may comprise an operating element arranged in a recessed manner with respect to the outer surface of the third tube, wherein the operating element allows a user to operate the first locking system. Having the operating element arranged in a concave manner allows the operating element to slide into the second tube when the adjustable tube arrangement is folded.

As an example, the first locking system may comprise a first opening through the associated third tube, a first pin arranged inside the third tube in alignment with the first opening, and a first spring for spring biasing the first pin to urge the first pin to protrude through the first opening. The first locking system may further comprise a plurality of second openings passing through the second tubes, each of the second openings being alignable with the first openings according to a position of the associated third tube relative to the associated second tube. The associated third tube may be locked relative to the associated second tube by a first pin projecting through one of the first and second openings. The associated third tube may be unlocked relative to the associated second tube by operating the operating element, which causes the first pin to be retracted through the associated second opening. For example, the first locking system may comprise one or more cables connecting the operating element and the first pin.

The associated third tube may further comprise a pulley, wherein the one or more cables comprise: a first cable extending from the operating element across the pulley and back to a fixed position near the operating element; and a second cable connecting the pulley to the first pin. The use of a pulley allows the user to apply sufficient force to overcome the first spring biasing force despite the fact that the user may only apply a limited force to the operating element due to the recessed placement of the operating element in the associated third tube.

The second locking system may include: a first inclined surface formed in an end section of the associated third tube; a second pin disposed inside the mounting adapter; and a third opening in the wall of the associated first tube, wherein the third opening is aligned with the second pin. The second locking system may further include a second spring for spring biasing the second pin to urge the second pin to move through the third opening and to restrict movement of the associated second tube of the associated first tubes to a second predetermined position. The second locking system is further configured such that engagement of the first angled surface with the second pin causes the second pin to move toward the mounting adapter such that the associated second tube can also move into the associated first tube beyond the second predetermined position. In addition, the second pin may comprise a second inclined surface configured to cooperate with the first inclined surface so as to move the second pin towards the mounting adapter, the second inclined surface allowing the associated second tube to push the second pin further towards the mounting adapter so as to move the associated second tube further into the associated first tube beyond the second predetermined position.

The third locking system may include: a third pin disposed inside the mounting adapter; and a fourth opening in the wall of the associated first tube, the fourth opening aligned with the third pin. The third locking system may further include a third spring for spring biasing the third pin to urge the third pin away from the fourth opening toward the mounting adapter. The third locking system is further configured such that, when the support device is placed in the mounting adapter, the third pin moves through and beyond the fourth opening such that the penetration depth of the associated third tube is limited to a first predetermined position, and such that, under the influence of the spring biasing force, the third pin moves towards the mounting adapter such that, when the support device is removed from the mounting adapter, or if the support device is at least partially folded, with the support device being adjustable between a folded position and a use position, the associated third tube is allowed to penetrate the associated first tube beyond the first predetermined position.

The third locking system may further comprise a fifth opening in the associated second tube through which the third pin protrudes when the support device is placed in the mounting adapter.

A first locking system, a second locking system and a third locking system may be provided for each adjustable tube arrangement.

The support means may be a child seat. Furthermore, the child seat may be foldable. The upper frame and the lower frame may be hingedly connected, wherein the device may be folded by pivoting the upper frame towards the lower frame. The at least one adjustable tube arrangement may comprise a fourth locking system for locking the pivotal movement of the upper frame relative to the lower frame, wherein the fourth locking system may be operated by engagement with an end section of the associated third tube. Here, the device may be foldable while the child seat remains connected to the mounting adapter.

According to a third aspect, the invention also provides a system for transporting a child, comprising the above-described device and a support device.

The various aspects of the present invention will be described in more detail below with reference to the appended drawings, wherein like reference numerals are used to refer to the same or similar parts, and wherein:

fig. 1 shows a perspective view of an embodiment of a device according to the first aspect of the invention in a position of use;

2A-2C illustrate different stages of unlocking a second lock of a lower frame of the device of FIG. 1;

FIG. 3 depicts a partial side view of the device of FIG. 1 in a folded position;

fig. 4 depicts a perspective view of an embodiment of a device according to the second aspect of the invention in a position of use;

FIG. 5 depicts a detailed side view of the embodiment of FIG. 4;

FIG. 6 depicts a partially open detailed view of the embodiment of FIG. 4;

FIG. 7 depicts the connecting member of the embodiment of FIG. 4 in a first position;

FIG. 8 depicts the connecting member of the embodiment of FIG. 4 having been pivoted away from a first position;

fig. 9 shows a perspective view of an embodiment of the device according to the third aspect of the invention in a position of use;

FIG. 10 depicts a detailed side view of the embodiment of FIG. 9;

FIG. 11 depicts a first locking system in the embodiment of FIG. 9;

FIG. 12 depicts a detailed perspective view of the embodiment of FIG. 9, partially open; and

figures 13 and 14 show different views of the second and third locking systems in the embodiment of figure 9.

Fig. 1 shows a perspective view of an embodiment of a buggy 1 according to the first aspect of the invention in a position of use. It includes a lower frame 10, an upper frame 20, and a pusher 30. The lower frame 10 comprises a first lower frame section 11 and a second lower frame section 12 which are hingedly connected. In fig. 1, the first lower frame section 11 comprises a pair of first lower frame tubes 13, and the second lower frame section 12 comprises a pair of second lower frame tubes 14 hingedly connected to the first lower frame tubes 13 by means of hinges 15.

The upper frame 20 includes a pair of first upper frame tubes 21 and a pair of second upper frame tubes 22. Each second upper frame tube 22 is received in a corresponding first upper frame tube 21. Further, each first upper frame tube 21 is hingedly connected to a corresponding first lower frame tube 13 using a hinge 23.

The stroller 1 further comprises a transverse tube connecting the left and right sides of the stroller 1. More specifically, the stroller 1 comprises a front transverse tube 24 connecting the coupling housing members 25 in which the hinges 23 are arranged. At the rear of the stroller 1, a rear cross tube 26 is provided to which the second lower frame tube 14 is connected.

The pusher 30 includes a pair of first arms 31 and a pair of second arms 32, wherein each first arm 31 is received in a respective second upper frame tube 22, and wherein each first arm 31 is hingedly connected to a respective second arm 32 using a hinge 33. The transverse arm 34 connects the pair of second arms 32.

As shown in fig. 3, the hinge 33 is formed using a gear 37 movably connected to the second arm 32 and a gear housing 38 fixedly connected to the first arm 31. The gear housing 38 and the gear 37 both have a toothed structure and are arranged coaxially with respect to a rotational axis corresponding to the pivoting movement of the second arm 32. In the position of use of the stroller 1, the gear 37 will engage with the gear housing 38, thereby preventing any rotation of the second arm 32 relative to the first arm 31. However, such locking may be released by the user operating the first operating element 36. Operating the element will cause the gear 37 to translate so that it is out of engagement with the gear housing 38. The first operating member 36 is spring biased such that when the user no longer operates the first operating member 36, the gear 37 translates rearward and again engages the gear housing 38. In this way, the user can select a desired angle between the first arm 31 and the second arm 32.

The combination of the first arm 31, the second upper frame tube 22 and the first upper frame tube 21 forms a telescopic unit, which means that the first arm 31 is movable inside the second upper frame tube 22 and that both

tubes

31, 22 are movable inside the first upper frame tube 21. An operating element 35 is provided which can be operated by a user to change the height of the pusher 30. More specifically, the user can operate the operating element 35 to allow the user to push or pull the pusher to change its effective height.

Next, a process of folding the stroller 1 will be described in detail with reference to fig. 2A to 2C. Here, fig. 2A shows a situation corresponding to the use position of the stroller 1 shown in fig. 1. Said position of the lower frame 10 corresponds to a first lower frame position.

As a first step, the user will operate the paddle-shaped second operating member 40 by pushing it downwards, as shown in fig. 2B. At the same time, due to the fact that the second operating member 40 partially overlaps the brake operating member 50, the latter operating member 50 will also be operated, causing the rear wheel 60 to become blocked. Pushing the second operating element 40 downwards will cause the pin 41 protruding from the second lower frame tube 14 to disengage from the first opening 42 (shown in fig. 3) in the first lower frame tube 13 via the cable 44. This unlocks the hinge 15 so that the second lower frame tube 14 can pivot with respect to the first lower frame tube 13. This is shown in fig. 2C.

The position of the lower frame 10 shown in fig. 2C corresponds to the second lower frame position. In said position, the pin 41 engages in the second opening 43 to lock the second lower frame tube 14 to the first lower frame tube 13, see fig. 3. Here, it should be noted that the depth of the first opening 42 is significantly greater than the depth of the second opening 43, such that the locking force associated with the second lower frame position is significantly less than the locking force associated with the first lower frame position.

Next, the user will operate the operating element 35 to unlock the pusher 30. Thereafter, the user will push the pusher 30 downwards so that the first arm 31 is almost completely received in the second upper frame tube 22, which in turn is almost completely received in the first upper frame tube 21. By pushing the pusher 30 completely downward, the pivotal movement of the upper frame 20 and the lower frame 10 will be released, thereby allowing the user to pivot the upper frame 20 toward the lower frame 10.

The user may then operate the first operating element 36 to unlock the pivotal movement of the second arm 32 relative to the first arm 31. When the first operating member 36 is operated, the user pushes the second arm 32 toward the lower frame 10. When the second arm 32 reaches and/or contacts the second lower frame tube 14, the user releases the first operating element 36, and the second arm 32 is locked with respect to the first arm 31. The resulting situation is shown in the side view of fig. 3. As is clear from said figures, the hinge 15 is located in the triangle formed by point a corresponding to the hinge 23, point B corresponding to the hinge 33 and the end of the second arm 32.

To deploy the stroller 1, the user can operate the first operating element 36 and bring the second arm 32 back into line with the first arm 31. Then, the user may pivot the upper frame 20 with respect to the lower frame 10. Once in the position corresponding to the position of use of the buggy 1, the upper frame 20 is automatically locked with respect to the lower frame 10 so that no further rotation is possible. The user may then pull the pusher 30 upward to a desired height.

Thereafter, the user may then push the stroller 1 forward. Because the rear wheel 60 is still locked, a force in the rearward direction will be generated on the wheel 60. When high enough, the lock provided by the pin 41 engaging the second opening 43 will be overcome and the pin 41 will move out of the second opening 43. Furthermore, due to the rearward force, the second lower frame tube 14 will pivot rearward to the first lower frame position. In this position, the spring bias of the pins 41 will cause them to engage the first openings 42, thereby locking the second lower frame tube 14 relative to the first lower frame tube 13. At this stage, the rear wheels 60 are still blocked. This can be released by operating the brake operating member 50. Thereafter, the user can walk with the stroller 1.

Fig. 4 shows a perspective view of an embodiment of the buggy 1 according to the second aspect of the invention in the position of use. It includes a lower frame 10, an upper frame 20, and a pusher 30. The lower frame 10 comprises a first lower frame section 11 and a second lower frame section 12 which are hingedly connected. In fig. 4, the first lower frame section 11 includes a pair of first lower frame tubes 13, and the second lower frame section 12 includes a pair of second lower frame tubes 14 hingedly connected to the first lower frame tubes 13 with hinges 15.

The hinge 33 is formed using a gear fixedly connected to the second arm and a gear housing fixedly connected to the first arm. Both the gear housing and the gear have a toothed structure and are arranged coaxially with respect to a rotational axis corresponding to the pivoting movement of the second arm 32. In the position of use of the stroller 1, the gear will engage with the gear housing, thereby preventing any rotation of the second arm 32 relative to the first arm 31. However, such locking may be released by the user operating the first operating element 36. Operating the element will cause the gear to translate such that it is out of engagement with the gear housing. The first operating member 36 is spring biased so that when the user no longer operates the first operating member 36, the gear translates rearward and again engages the gear housing. In this way, the user can select a desired angle between the first arm 31 and the second arm 32.

tubes

For the purpose of explaining the function associated with pivoting the upper frame 20 relative to the lower frame 10 (as will be explained in connection with fig. 5 to 8), the combination of the first arm 31, the second arm 32 and the second upper frame tube 22 is considered as the third second tube 120. Further, for similar reasons, the combination of the first lower frame tube 13 and the second lower frame tube 14 is regarded as a single first tube 100. The first upper frame tube 21 is considered as a second tube 110.

Fig. 4 also depicts a pair of connecting members 130 hingedly connected to respective connecting member housings 131. The connecting members 130 are connected to each other by a cross member 132. Further, as shown in fig. 5 and 6, each of the connection members 130 includes a first portion 133 and a second portion 134 hingedly connected using a hinge 135. Here, it is noted that the positions shown in fig. 5 and 6 correspond to the positions where the connecting member 130 is located when the stroller 1 is in the use position.

Next, the operation of pivoting the upper frame 20 with respect to the lower frame 10 will be described in more detail with reference to fig. 7 and 8.

The third tube 120, and more specifically the second arm 32, includes an end section 121. When the third tube 120 has been received in the second tube 110 to the first penetration depth, the first inclined surface 122 of the end section 121 engages a first pin 140 which is arranged in a spring-biased manner in a first cavity 142 in the connecting member housing 131 using a spring 141. In fig. 7, the first pin 140 penetrates the first opening 111 in the second tube 110. The connecting member 130 includes a second pin 143 disposed in a second cavity 144 of the connecting member 130. The second pin 143 is spring biased by a spring 145 such that it is urged to penetrate the first cavity 142.

When the first inclined surface 122 engages the first pin 140, it will push the second pin 143 completely inside the second cavity 144 via the first pin 140. The interface between the first pin 140 and the second pin 143 will coincide with the interface between the connecting member 130 and the connecting member 131.

Further, at the same time, the third pin 146 is arranged in a spring-biased manner in the fourth cavity 147 using

springs

148, 149. The third pin 146 includes a first pin portion 150 that is received in a second pin portion 151. The movement of the first pin portion 150 is guided by means of a peg 152 extending in a slot 153 in the second pin portion 151. Also, the spring 148 is configured to push the second pin portion 151 toward the connection member 130, and the spring 149 is configured to push the second pin portion 151 away from the first pin portion 150.

In the position shown in fig. 7, in which the position of the connecting member 130 corresponds to the first position, the first pin portion 150 extends through the second opening 112 in the second tube 110 and engages the first recess 124 in the end section 121, thereby locking the third tube 110 relative to the second tube 120.

In addition to the above-described locking, in the first position of the connecting member 130, since the second pin 143 is completely inside the second cavity 144 and the first pin 140 does not extend into the second cavity 144, the connecting member 130 is able to pivot relative to the connecting member housing 131.

The connecting member 130 includes a third lumen 154. When the connecting member 130 is pivoted away from the first position, the third cavity 154 becomes aligned with the third pin 146. This causes the first pin portion 150 to move out of the first recess 124 and the second pin portion 151 to move into the third cavity 154. This is shown in fig. 8. At this time, the third tube 120 is no longer locked to the second tube 110. Because the third tube 120 is spring biased to move upward, the third tube 120 will move from the first penetration depth shown in fig. 7 to the second penetration depth shown in fig. 8.

The fourth pin 155 is arranged in a spring-biased manner in a sixth cavity 157 in the connection member housing 131 using a spring 156. As shown in fig. 7, it is spring biased to penetrate into a fifth cavity 158 in the connecting member 130. However, in the position shown in fig. 8, due to the pivoting of the connecting member 130, the fourth pin 155 is pushed by the wall of the fifth cavity 158 through the third opening 113 in the second tube 112 to be placed against the outer wall 125 of the first recess 124. This again locks the third tube 120 to the second tube 110. However, as the position of the end section 121 is offset from the first penetration depth to the second penetration depth, the first pin 140 has been offset rearwardly, allowing the second pin 143 to engage the penetrated first cavity 142 as long as the connecting member 130 is in the first position. Thus, fig. 8 shows a situation in which once the connecting member 130 is pivoted to the first position, the connecting member can be locked again, while the third tube 130 is locked to the second tube 120.

In fig. 8, when the connecting member 130 is again in the first position, the second pin 143 will engage the first cavity 142, thereby locking the connecting member 130 to the connecting member housing 131. However, due to the pivoting movement, the fourth pin 155 becomes aligned with the fifth cavity 158 and will move away from the outer wall 125 into the fifth cavity 158, thereby releasing the third tube 120 from the second tube 110. Thus, the user can pull the pusher 30 upward without operating another operation element.

Fig. 9 shows a perspective view of an embodiment of a buggy according to the third aspect of the invention 1 in a position of use. It includes a lower frame 10, an upper frame 20, and a pusher 30. The lower frame 10 comprises a first lower frame section 11 and a second lower frame section 12 which are hingedly connected. In fig. 4, the first lower frame section 11 includes a pair of first lower frame tubes 13, and the second lower frame section 12 includes a pair of second lower frame tubes 14 hingedly connected to the first lower frame tubes 13 with hinges 15.

tubes

Fig. 9 also depicts a pair of connecting members 130 hingedly connected to respective connecting member housings 131. The connecting members 130 are connected to each other by a cross member 132. Further, each connecting member 130 includes a first portion 133 and a second portion 134, which are hingedly connected using a hinge 135. These parts are shown in fig. 10. The position shown in fig. 9 corresponds to the position in which the connecting member 130 is located when the stroller 1 is in the use position.

The connecting member 130 and the connecting member housing 131 are part of a fourth locking system to lock the pivotal movement of the upper frame 20 relative to the lower frame 10. The fourth locking system may be operated by engaging an end section of the first arm 31 of the pusher 30.

Fig. 9 also depicts a pair of mounting adapters 230 that are connected to the first upper frame tube 21. The foldable child seat 231 is connected to the stroller 1 using the mounting adapter 230.

Next, the operation of the telescopically arranged pusher 30 and the manner in which it can be folded will be discussed with reference to fig. 10 to 14. In this specification, the first arm 31 and the second arm 32 will be collectively referred to as a third pipe 220, the second upper frame pipe 22 will be referred to as a second pipe 210, and the first upper frame pipe 21 will be referred to as a first pipe 200.

Fig. 10 and 11 illustrate a first locking system. In these figures, a locked situation is depicted. The first locking system includes a first opening 221 through the third tube 220 and a first pin 222 disposed inside the third tube 220 and aligned with the first opening 221. A first spring 223 is mounted inside the third tube 220 for spring biasing the first pin 222 to urge the first pin 222 to protrude through the first opening 221.

A plurality of second openings 211 are arranged through the second tube 210, each of the second openings 211 being alignable with the first opening 221 according to a position of the third tube 220 relative to the second tube 210.

Disposed in the third tube 220 are a pulley 224 and a first cable 225 that extends from the operating element 35, across the pulley 224, and back to a fixed position near the operating element 35. A second cable 226 connects the pulley 224 to the first pin 222.

When the user operates the operating element 35, the first cable 225 is pulled, causing the pulley 224 to be displaced approximately half the distance traveled by the operating element 35. Via the second cable 226, the first pin 222 is retracted from the second opening 211, allowing the third tube 220 to move relative to the second tube 210. When the operating element 35 is released, the first pin 222 is pressed outwards. Thus, when the third tube 220 is moved such that the first opening 221 becomes aligned with the next second opening 211, the first pin 222 will penetrate the latter opening and re-lock the third tube 220 relative to the second tube 210.

Fig. 12 to 14 illustrate the second and third locking systems. When the pusher 30 is pushed downwards, the end section of the second tube 220 will first encounter the third locking system after having passed the first locking system, that is, assuming it is in a locked state.

The third locking system comprises a third pin 240 arranged inside mounting adapter 230 and a fourth opening 241 in a wall 242 of first tube 200. The fourth opening 241 is aligned with the third pin 240. A third spring 243 is provided inside the mounting adaptor 230 for spring biasing the third pin 240 to urge the third pin 240 to move away from the fourth opening 241 towards the mounting adaptor 230.

When the third pin 240 moves through and beyond the fourth opening 241 and through and beyond the fifth opening 212 in the second tube 210, it provides an obstruction that limits the depth of penetration of the third tube 220 to the first predetermined position. When the third pin 240 does not protrude through and beyond the fourth and

fifth openings

241, 212, the third tube 220 and/or the second tube 210 are no longer locked by the third locking system.

Whether the third pin 240 limits the penetration depth of the third tube 220 to the first predetermined position depends on whether a support device, such as a child seat 231, is placed in the mounting adapter 230. More specifically, under the influence of the spring biasing force, the third pin 240 moves towards the mounting adapter 230, allowing the third tube 220 to penetrate the first tube 200 beyond the first predetermined position when the support means 231 is removed from the mounting adapter 230, or if the support means is at least partially folded when mounted to the mounting adapter 230 in the case where the support means is adjustable between a folded position and a use position, such as a child seat 231. If these conditions do not apply, the third pin 240 will penetrate the

openings

212, 241, thereby limiting the penetration depth of the third tube 220.

The second locking system comprises a first inclined surface 250 formed in an end section of the third tube 220, a second pin 251 arranged inside the mounting adapter 230, a third opening 252 in the wall 242 of the first tube 200. The third opening 252 is aligned with the second pin 251.

The second locking system further comprises a second spring 253 for spring biasing the second pin 251 to urge the second pin 251 to move through the third opening 252, thereby blocking the second tube 210 in the first tube 200 from moving to the second predetermined position.

The second pin 251 includes a second inclined surface 254 configured to cooperate with the first inclined surface 250 to move the second pin 251 toward the mounting adapter 230. After being engaged by the first angled surface 250, the second angled surface 254 allows the second tube 210 (and more particularly the wall 255 of the second tube 210) to push the second pin 251 further toward the mounting adapter 230. Thus, the third tube 220 and the second tube 210 may also be moved into the first tube 200 beyond the second predetermined position.

After the second and third locking systems have been unlocked, the second and

third tubes

210, 220 may be moved deeper inside the first tube 200. For example, the end section of the third tube 220 may be used to unlock the pivotal movement of the upper frame 20 relative to the lower frame 10.

In the above, the present invention has been explained using detailed embodiments of the present invention. However, the present invention is not limited to these embodiments, since various modifications can be made without departing from the scope of the present invention as defined by the appended claims.

In particular, three different aspects of the invention have been described separately. However, those skilled in the art will readily appreciate from the description and from, for example, inspection of fig. 1, 4, and 9 that these aspects all relate to various aspects of one and the same physical embodiment. Thus, the present invention is not limited to the various aspects of the invention, but equally relates to combinations of these aspects.

Furthermore, in the various figures, mechanical mechanisms implemented on the left and right sides of the device have been presented. It should be noted that the invention equally relates to embodiments in which such mechanisms are applied only to the left or right side.

List of reference numerals

Perambulator 1

Lower frame 10

The first lower frame part 11

The second lower frame portion 12

First lower frame tube 13

Second lower mount pipe 14

Hinge lower frame 15

Upper frame 20

First upper frame tube 21

Second upper frame tube 22

Hinge 23

Front cross tube 24

Coupling housing component 25

Rear transverse tube 26

Pusher 30

First arm 31

Second arm 32

Hinge 33

Transverse arm 34

Operating element pusher 35

First operating element 36

Gear 37

Gear housing 38

Second operating element 40

Pin 41

First opening 42

Second opening 43

Cable 44

Brake operating element 50

Rear wheel 60

Front wheel 61

First pipe 100

Second pipe 110

First opening 111

Second opening 112

Third opening 113

Third tube 120

End section 121

First inclined surface 122

Second inclined surface 123

First recess 124

Outer wall first recess 125

Connecting member 130

Connecting member case 131

Cross member 132

First portion 133

Second portion 134

Hinge 135

First pin 140

Spring 141

First chamber 142

Second pin 143

Second chamber 144

Spring 145

Third pin 146

Fourth chamber 147

Spring 148

Spring 149

First pin portion 150

Second pin portion 151

Nail 152

Slot 153

Third chamber 154

Fourth pin 155

Spring 156

Sixth chamber 157

Fifth chamber 158

First pipe 200

Second pipe 210

Second opening 211

Fifth opening 212

Third pipe 220

First opening 221

First pin 222

First spring 223

Pulley 224

First cable 225

Second cable 226

Mounting adapter 230

Children's seat 231

Third pin 240

Fourth opening 241

Wall 242

Third spring 243

First inclined surface 250

Second pin 251

Third opening 252

Second spring 253

Second inclined surface 254

Wall second tube 255

Claims

1. A device for transporting a child, such as a stroller or buggy, comprising:

a lower frame and an upper frame hingedly connected to each other so as to allow the device to be adjustable between a use position and a folded position, wherein the lower frame includes front and rear wheels; and

a pusher telescopically received in the upper frame;

it is characterized in that the preparation method is characterized in that,

the lower frame comprises a first lower frame portion to which the front wheels are mounted and a second lower frame portion to which the rear wheels are mounted, wherein the first lower frame portion and the second lower frame portion are hingedly connected to each other, wherein the pusher comprises a first pusher portion and a second pusher portion that are hingedly connected to each other, and wherein in the folded position the second lower frame portion has been pivoted away from the pusher and towards the front wheels and the second pusher portion has been pivoted towards the lower frame such that the second pusher portion is placed adjacent to the second lower frame portion.

2. The device of claim 1, wherein in the folded position, the second lower frame portion and the second pusher portion extend in substantially the same direction.

3. The device of claim 1 or 2, wherein in the folded position, the second pusher portion is placed against the second lower frame portion.

4. The device according to any one of the preceding claims, wherein in the folded position, a hinge between the second lower frame portion and the first lower frame portion is arranged within a triangle defined by points corresponding to the hinge between the upper and lower frames, the hinge between the first and second pusher portions and an end of the second pusher portion, when viewed from the side.

5. The device according to any one of the preceding claims, wherein the second pusher portion and the second lower frame portion each pivot through an angle greater than 60 degrees, preferably greater than 75 degrees, when changing between the use position and the folded position.

6. The device of any one of the preceding claims, further comprising:

a first lock for locking the second pusher portion relative to the first pusher portion in at least a first pusher position corresponding to the use position of the device and a second pusher position corresponding to the folded position of the device;

a first operating element for operating the first lock.

7. The apparatus of claim 6, wherein the first lock comprises: a gear movably connected to one of the first pusher portion and the second pusher portion; and a gear housing arranged coaxially with the gear along a rotation axis corresponding to a rotation between the first pusher portion and the second pusher portion, the gear housing being fixedly connected to the other of the first pusher portion and the second pusher portion and comprising teeth for engagement with the gear, wherein by operating the first operating element the gear is translatable along the rotation axis so as to disengage or engage the gear housing, thereby releasing or blocking, respectively, a pivotal movement of the second pusher portion relative to the first pusher portion.

8. The device according to any of the preceding claims, further comprising a second lock for locking the second lower frame portion in at least a first lower frame position relative to the first lower frame portion corresponding to the use position of the device.

9. The device of claim 8, wherein the second lock is further configured to lock the second lower frame portion in a second lower frame position relative to the first lower frame portion corresponding to the folded position of the device.

10. The apparatus of claim 8 or 9, wherein the second lock comprises:

one of a receiving element and an engaging element arranged in the second lower frame section and the other of a receiving element and an engaging element arranged in the first lower frame section;

a second operating element for operating the second lock, the second operating element being configured to bring the receiving element and the engaging element into or out of engagement in order to lock or unlock the second lock, respectively.

11. The device according to claim 10, wherein the engagement element is arranged in the second lower frame portion, and wherein the first lower frame portion comprises a further engagement element to allow the first and second lower frame portions to be locked when the second lower frame portion is in the second lower frame position.

12. The device of claim 10 or 11, wherein the engagement element comprises a pin, and wherein the receiving element and/or the further receiving element comprises a hole.

13. The device of any one of the preceding claims, further comprising a brake for blocking the rear wheel and a brake operating element for operating the brake.

14. A device according to claim 13 and any one of claims 10 to 12, wherein the brake operating element and the second operating element are coupled such that the action of operating the second operating element is mechanically coupled to the action of operating the brake operating element such that the action of unlocking the second lock will automatically block the rear wheel and such that blocking and unblocking the rear wheel can be performed independently of locking or unlocking the second lock when the device is in the use position.

15. The device of claim 14, wherein a locking force for locking the second lower frame portion in the second lower frame position can be overcome by a user pushing the device forward at a position of the device where the upper frame portion and the pusher have been brought to a position corresponding to the use condition.

16. The device of claim 14 or 15, wherein the second operating element and the brake operating element are both paddle-shaped and arranged adjacent, wherein when pushed in a first direction, the second operating element and the brake operating element respectively perform the action of unlocking the second lock and blocking the rear wheel, wherein the second operating element partially protrudes above the brake operating element when viewed in the first direction.

17. The device of any one of the preceding claims, wherein the upper frame comprises a pair of upper frame tubes, and wherein the first pusher portion comprises a pair of first arms and the second pusher portion comprises a pair of second arms, each first arm being received in a respective upper frame tube and hingedly connected to a respective one of the second arms.

18. The device of any of the preceding claims, wherein the first lower frame portion comprises a pair of first lower frame tubes and the second lower frame portion comprises a pair of second lower frame tubes, wherein each first lower frame tube is hingedly connected to a respective second lower frame tube.

19. The device of claims 17 and 18, wherein in the folded position, the second lower frame tube is substantially parallel to the second arm.

20. Apparatus according to claims 17 and 18 or claim 19, wherein each first lower frame tube is hingedly connected to a respective upper frame tube.

21. A device for transporting a child, such as a stroller or buggy, comprising:

a lower frame to which front and rear wheels are mounted, the lower frame including a pair of first tubes;

an upper frame including a pair of second tubes;

a pusher telescopically received in the upper frame, the pusher including a pair of third tubes;

a locking system operable by respective end sections of the third tube, the locking system locking pivotal movement of the upper frame relative to the lower frame; and

a pair of connecting members, each connecting a respective first tube to a respective second tube;

wherein each third tube is telescopically received in a respective second tube, and wherein each second tube is hingedly connected to a respective first tube for adjusting the device to a folded position or a use position;

it is characterized in that the preparation method is characterized in that,

the device further comprises a pair of connecting member housings, each connecting member housing being fixedly arranged to the exterior of a respective second tube, wherein each connecting member comprises a first portion hingedly connected to a respective connecting member housing and a second portion hingedly connected to a respective first tube, wherein the first and second portions are hingedly connected;

wherein the locking system is configured to release the pivotal movement of the connecting member relative to the connecting member housing and lock the third tube relative to the second tube when the penetration depth of the third tube in the respective second tube equals a first threshold value, and allow the connecting member to resume a locked state with the connecting member housing and lock the third tube relative to the second tube when the penetration depth of the third tube in the respective second tube equals a second threshold value different from the first threshold value.

22. The device of claim 21, wherein the locking system is further configured to unlock the third tube relative to the second tube and move or allow movement of the third tube when a depth of penetration of the third tube in the respective second tube is equal to the first threshold and the connecting member pivots after the pivotal movement is released such that the depth of penetration of the third tube in the respective second tube is equal to the second threshold.

23. The device of claim 22, wherein each third tube is spring biased to move in a direction away from the respective second tube to enable movement from the first penetration depth to the second penetration depth.

24. The device of any one of claims 21-23, wherein the second penetration depth is less than the first penetration depth.

25. The device of any one of claims 21 to 24, wherein in the use position, each connecting member is in a first position relative to the connecting member housing, and wherein in the folded position, each connecting member is in a second position relative to the connecting member housing.

26. The device of claim 25, wherein the locking system is configured to release the pivotal movement of the connecting member relative to the connecting member housing and lock the third tube relative to the second tube when a penetration depth of the third tube in the respective second tube is equal to a first threshold and when the connecting member is in the first position.

27. The device of claim 25 or 26, wherein the locking system is configured to release the locking of the third tube relative to the second tube once the connecting member returns to the first position.

28. The apparatus of any one of claims 25 to 27, wherein the locking system comprises:

a first pin disposed in a first cavity for each connecting member housing, the first pin being spring biased to penetrate a respective first opening in the second tube;

a second pin disposed in a second cavity for each connecting member, the second pin being spring biased to penetrate a respective first cavity when the connecting member is in the first position; and

wherein when the penetration depth of the third tube in the respective second tube equals the first threshold, the second pin is removed from the first cavity using the first pin by the end section engaging the first pin and pushing the second pin out of the first cavity.

29. The device of claim 28, wherein an interface of the second pin and the first pin coincides with an interface between the connecting member and the connecting member housing immediately after the second pin is pushed out by the first pin.

30. The apparatus of claim 28 or 29, wherein the locking system comprises:

a third cavity in each connecting member spaced apart from the second cavity;

a third pin disposed in a fourth cavity for each connecting member housing, the third pin being spring biased to penetrate a respective second opening in the second tube or into a respective third cavity;

wherein when the connecting member is in the first position and the penetration depth of the third tube in the respective second tube is equal to the first threshold, the wall of the third lumen engages the third pin such that the third pin penetrates the second opening so as to lock the third tube relative to the second tube; and

wherein when the connecting member is pivoted away from the first position, the third pin penetrates the third lumen, thereby disabling locking of the third tube relative to the second tube.

31. The apparatus of claim 28, 29 or 30, wherein the locking system comprises:

a fifth cavity in each connecting member;

a fourth pin disposed in a sixth cavity for each connecting member housing, the fourth pin being spring biased to pass into a respective fifth cavity;

wherein when the connecting member is pivoted away from the first position and the penetration depth of the third tube in the respective second tube is equal to the second threshold, the cavity wall of the fifth cavity engages the fourth pins and pushes these pins through the third opening in the second tube so as to lock the third tube relative to the second tube.

32. The device of claim 31, wherein the locking system is configured such that when the connecting member returns to the first position, the fourth pins are retracted from the second tube and each fourth pin penetrates a respective fifth lumen such that the third tube cannot be locked relative to the second tube.

33. The device of claim 31 or 32, wherein the fifth lumen merges with the third lumen.

34. A device for transporting a child, such as a stroller or buggy, comprising:

a lower frame to which front and rear wheels are mounted;

an upper frame including a pair of first tubes and a pair of second tubes, each second tube being received in a respective first tube;

a pusher comprising a pair of third tubes, each third tube being received in a respective second tube;

wherein the pusher is telescopically adjustable relative to the second tube, and wherein the second tube is slidably received in the first tube;

wherein the first, second and third tubes form a pair of telescopically adjustable tube arrangements;

wherein at least one of the adjustable tube arrangements comprises a first locking system for locking the associated third tube to the associated second tube and a second locking system for locking the associated second tube to the associated first tube, the associated third tube comprising an end section received in the associated second tube;

wherein the second locking system is operable by engagement with the end section of the associated third tube;

wherein the at least one adjustable tube arrangement further comprises a mounting adapter mounted to an exterior of the associated first tube, the mounting adapter being configured to receive a support device for a child, such as a child seat or a crib, the device further comprising a third locking system configured to limit the penetration depth of the third tube in the first tube to a first predetermined position such that the third tube cannot engage the second locking system, the third locking system is configured to at least partially collapse when the support device is mounted to the mounting adapter when the support device is removed from the mounting adapter or if the support device is adjustable between a collapsed position and a use position, releasing the third tube to enable the third tube to move past the first predetermined position.

35. The apparatus of claim 34, wherein the second locking system is further configured to lock the associated third tube to the associated second tube.

36. The apparatus of any one of claims 34 to 35, wherein the first locking system allows the associated third tube to be locked to the associated second tube at a plurality of different positions along the second tube.

37. The apparatus of claim 36, wherein the second locking system is operable only when the third tube has passed a final position in which the third tube can still be locked to the second tube using the first locking system.

38. The device of any one of claims 34 to 37, wherein the associated third and second tubes are configured such that at or near the time the second locking system is operated by the end section of the associated third tube, the associated third tube cannot penetrate further into the associated second tube.

39. The device according to any one of claims 34 to 38, wherein the associated third tube comprises an operating element arranged in a recessed manner with respect to an outer surface of the third tube, the operating element allowing a user to operate the first locking system.

40. The apparatus of claim 39, wherein the first locking system comprises:

a first opening through the associated third tube;

a first pin disposed inside the third tube and aligned with the first opening;

a first spring for spring biasing the first pin to urge the first pin to protrude through the first opening;

a plurality of second openings through the second tube, each of the second openings alignable with the first opening according to a position of the associated third tube relative to the associated second tube;

wherein the associated third tube is lockable relative to the associated second tube by the first pin protruding through one of the first and second openings;

wherein the associated third tube is unlockable relative to the associated second tube by operation of the operating element which causes the first pin to retract through the second opening.

41. The device of claim 40, further comprising one or more cables connecting the operating element and the first pin.

42. The device of claim 41, wherein the associated third tube further comprises a pulley, wherein the one or more cables comprise: a first cable extending from the operating element across the pulley and back to a fixed position near the operating element; and a second cable connecting the pulley to the first pin.

43. The apparatus of any one of claims 34 to 42, wherein the second locking system comprises:

a first inclined surface formed in the end section of the associated third tube;

a second pin disposed inside the mounting adapter;

a third opening in a wall of the associated first tube, the opening aligned with the second pin;

a second spring for spring biasing the second pin to urge the second pin to move through the third opening to block movement of the associated second tube of the associated first tubes to a second predetermined position;

wherein the second locking system is configured such that engagement of the first inclined surface with the second pin causes the second pin to move toward the mounting adapter such that the associated second tube can be moved further into the associated first tube beyond the second predetermined position.

44. The apparatus according to claim 43 wherein the second pin includes a second inclined surface configured to cooperate with the first inclined surface to move the second pin toward the mounting adapter, the second inclined surface allowing the associated second tube to push the second pin even further toward the mounting adapter to move the associated second tube even further into the associated first tube beyond the second predetermined position.

45. The apparatus of any one of the preceding claims, wherein the third locking system comprises:

a third pin disposed inside the mounting adapter;

a fourth opening in the wall of the associated first tube, the opening aligned with the third pin;

a third spring for spring biasing the third pin to urge the third pin to move away from the fourth opening toward the mounting adapter;

wherein the third locking system is configured such that when the header is placed in the mounting adapter, the third pin moves through and beyond the fourth opening such that the penetration depth of the associated third tube is limited to the first predetermined position, and such that when the header is removed from the mounting adapter or if the header is at least partially folded with the header adjustable between a folded position and a use position, the third pin moves toward the mounting adapter under the influence of a spring biasing force, thereby allowing the associated third tube to penetrate the associated first tube beyond the first predetermined position.

46. The apparatus according to claim 45, wherein the third locking system further comprises a fifth opening in the associated second tube through which the third pin protrudes when the support device is placed in the mounting adapter.

47. The device of any one of claims 34 to 46, wherein a first locking system, a second locking system and a third locking system are provided for each adjustable tube arrangement.

48. A device according to any one of claims 34 to 47, wherein the support device is a child seat.

49. The apparatus of claim 48, wherein the child seat is foldable.

50. The device according to any one of claims 34 to 49, wherein said upper frame and said lower frame are hingedly connected, wherein said device is foldable by pivoting said upper frame towards said lower frame, said at least one adjustable tube arrangement comprising a fourth locking system for locking the pivotal movement of said upper frame relative to said lower frame, wherein said fourth locking system is operable by engagement with said end section of said associated third tube.

51. The apparatus of claims 49 and 50, wherein the apparatus is foldable while the child seat remains connected to the mounting adapter.

52. A system for transporting a child comprising a device according to any one of claims 34 to 51 and a support device.

53. The device or system of any of the preceding claims.