A vehicle such as a foldable push chair and a method of folding such vehicle

Abstract

The invention provides a foldable vehicle comprising: a central body extending across the push chair, a handle assembly for engagement by a user to push the push chair; at least three wheel supporting legs rotatable around the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first hub forming part of the central body and the rearward extending leg is connected to a second hub forming part of the central body; an axial lock having a plurality of fingers or protrusions for engaging the first and second hubs, each of the first hub and second hub comprising recesses for receiving the locking fingers of the axial lock, the recesses being positioned on the first and second hub so as to define at least a first locking position in which the axial lock locks the first and second hubs with the vehicle in a folded configuration and a second locking position in which the axial lock locks the first and second hubs with the vehicle in an unfolded configuration. The vehicle of the present invention could be any suitable vehicle, including a push chair, a golf cart, a shopping trolley, a wheel chair etc.

Description

[0001] A Vehicle, a Method of Folding a Vehicle and a Method and System for Locking a Vehicle

[0002] The present invention relates to a vehicle such as a push chair and a method of folding a vehicle such as a push chair. The invention also relates to a method and system for locking a vehicle or push chair.

[0003] Push Chairs are well known for transporting small children and modern pushchairs can also be used and adapted for the carriage of babies. In this application, the term push chair is intended also to include what are also commonly referred to as strollers, buggies or prams and is also intended to describe a system comprising a chassis to which can be added a seat or a removable cot or other enclosure suitable for the transport of a baby or a small child. One of the desired features of a pushchair is that it can be folded to a compact dimension, so making it easier to carry, stow in a car or other transport means, such as a bus, train or aircraft.

[0004] Many push chairs are known to fold and stow into smaller dimensions. Most only fold into smaller sizes in one or two dimensions. Many examples can be found in the shops and in general use.

[0005] US2014 / 0312599 describes a foldable type of push chair, but in this case foldable to a backpack. The front legs are also foldable to help reduce the overall dimensions.

[0006] DE3147657A describes an arrangement having a combination of rods connected to the main support structures for providing the support, the rods being slidably connected to the support to ensure the correct relationship between the support rods.

[0007] A push chair that will fold so that it is compact when in a folded configuration is desirable.

[0008] In our granted patent GB2591211 there is described and disclosed a foldable push chair comprising a central body portion extending across the push chair and defining a central axis, the central axis extending substantially perpendicularly to the normal direction of travel of the push chair, a handle assembly connected to the central body and extending therefrom; at least three wheel supporting legs rotatable around the central axis and extending from the central body, in the unfolded state, one or more wheel supporting legs extending in a forward direction from the central axis and one or more wheel supporting legs extending in a rearward direction from the central axis; the forward and rearward extending legs being coupled together such that they rotate in opposite directions around the central axis during a folding or unfolding operation.

[0009] The push chair operates extremely well and provides solutions to a number of problems associated with push chairs described above. In particular it provides a push chair that is smaller in three dimensions when in the folded configuration.

[0010] According to a first aspect of the present invention, there is provided a foldable vehicle such as a push chair comprising: a central body extending across the push chair, a handle assembly for engagement by a user to push the push chair; at least three wheel supporting legs rotatable around the central body and extending from the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected directly or indirectly to a first hub forming part of the central body and the rearward extending leg is connected directly or indirectly to a second hub forming part of the central body; an axial lock having a plurality of fingers or protrusions for engaging the first and second hubs, each of the first hub and second hub comprising recesses for receiving the locking fingers of the axial lock, the recesses being positioned on the first and second hub so as to define at least a first locking position in which the axial lock locks the first and second hubs with the vehicle in an unfolded configuration and a second locking position in which the axial lock locks the first and second hubs with the vehicle in a folded configuration.

[0011] As used herein, it will be appreciated that “hub” refers to a part or component of the central body. No structural shape or specification is required by use of the term. However, it is preferable that the hubs are generally cylindrical so as to enable maintenance of the form of the body of the vehicle as the hub (with the leg connected) rotates.

[0012] A system for locking the vehicle is also provided in an aspect, the system comprising an axial lock having one or more (preferably a plurality of) fingers or protrusions for engaging the first and second hubs, each of the first hub and second hub comprising recesses for receiving the locking fingers of the axial lock, the recesses being positioned on the first and second hub so as to define at least a first locking position in which the axial lock locks the first and second hubs with the pushchair and a second locking position in which the axial lock locks the first and second hubs with the pushchair in an unfolded configuration. As used herein, it will be appreciated that “hub” refers to a part or component of the central body. No structural shape or specification is required by use of the term. However, it is preferable that the hubs are generally cylindrical so as to enable maintenance of the form of the body of the vehicle as the hub (with the leg connected) rotates.

[0013] Throughout the present description the embodiments described will be mostly examples of push chairs. However, it will be appreciated that the present vehicle and method are not limited to push chairs. The present system and method are applicable to any type of foldable vehicle and other examples, include shopping trolleys, golf trolleys, wheelchairs and the like.

[0014] It will also be appreciated that the coupling of the handle to the central body can be directly or via an intervening or intermediate component. What matters is that a pusher of the vehicle is able to impart movement to the vehicle by pushing the handle.

[0015] In an embodiment, the hubs are cylindrical and the recesses in the first hub correspond to the circumferential positions of the fingers, and the recesses on the second are shaped such that in the second locking position, the fingers extend into different recesses of the second hub than in the first locking position. Parts can take any shape

[0016] In an embodiment, at least one of the openings in the second hub has a circumferential extent that is longer than the circumferential extent of the fingers or protrusions.

[0017] In an embodiment, it is preferred that there are only two rotational positions at which the fingers or protrusions of the axial lock can enter the openings in the second hub. In one example it is possible that there is only a single position at which the fingers or protrusions of the axial lock can enter the openings in the second hub. When there is only a single position at which the fingers or protrusions of the axial lock can enter the openings in the second hub some alternative or additional means can be used to lock the push chair in a second position, e.g. a manually operable strap (optionally using material such as Velcro ®) can be used to lock the pushchair in the folded position.

[0018] In an embodiment, the axial position of the axial lock is movable.

[0019] In an embodiment, the axial position of the axial lock is biased into engagement with the recesses of both the first and second hub. In an embodiment, the foldable push chair comprises a biassing member to bias the axial lock into engagement with the recesses of both the first and second hub.

[0020] In an embodiment, the biassing member is a spring such as helical spring.

[0021] In an embodiment, the axial lock has an engagement portion for enabling control of its axial position.

[0022] In an embodiment, the engagement portion is a notch.

[0023] In an embodiment, the axial lock has one or more, and preferably at least three, fingers or protrusions.

[0024] In an embodiment, the axial lock has five fingers. The number of fingers can be chosen as desired. In one example more than 5 fingers are provided. For example, 10 fingers might be provided.

[0025] In an embodiment, the axial lock is cylindrical and the fingers of the same circumferential arc length.

[0026] In an embodiment, the circumferential arc length of the space between the fingers of each adjacent pair of fingers is different.

[0027] In an embodiment, the legs are arranged to fold upwards and in a rearwards direction such that in the folded state the seat and the handle assembly are arranged on opposite sides of the handle assembly when the push chair is in the folded state.

[0028] In an embodiment, the legs are coupled or connected together for rotation around the central body.

[0029] In an embodiment, each of the legs of the push chair have attached to them a wheel in which all the wheels of the push chair are the same size wheels. The wheels can also be of different sizes.. Any suitable configuration for the sizes of wheels can be used. In an embodiment, the foldable push chair includes a braking mechanism.

[0030] According to a second aspect of the present invention, there is provided a method of locking a push chair in an open or a closed configuration the push chair comprising, a central body extending across the push chair, and at least three wheel supporting legs rotatable around the central body and extending from the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction, the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first hub forming part of the central body and the rearward extending leg is connected to a second hub forming part of the central body, the method comprising, axially moving a lock having a plurality of fingers or protrusions for engaging the first and second hubs, each of the first hub and second hub comprising recesses for receiving the locking fingers of the axial lock, the recesses being positioned on the first and second hub so as to define at least a first locking position in which the axial lock locks the first and second hubs with the vehicle in an unfolded configuration and a second locking position in which the axial lock locks the first and second hubs with the vehicle in a folded configuration.

[0031] In one example, the axial lock functions only to lock the vehicle in the unfolded configuration. To lock in the folded configuration a band of material, e.g. Velcro ® or canvas can be used to ensure the folded wheels stay in the folded configuration.

[0032] According to a third aspect of the present invention, there is provided a foldable push chair comprising: a central body extending across the push chair, a handle assembly for engagement by a user to push the push chair; a seat for a passenger; at least three wheel supporting legs rotatable around the central body and extending from the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the one of the forward and rearward extending legs is connected to a first hub forming part of the central body and the other of the forward and rearward extending legs is connected to a second hub forming part of the central body; a plurality of locking fingers or protrusions provided on the first hub for engaging recesses on the second hub, the recesses being positioned on the second hub so as to define at least a first locking position in which the first and second hubs are locked with the pushchair in an unfolded configuration and a second locking position in which the first and second hubs are locked with the pushchair in a folded configuration.

[0033] As in the example described below in which the axial locking member 20 is arranged so as only to lock the hubs in the unfolded configuration, in this embodiment in which the fingers are provided integrated to one of the hubs, in one example, the fingers (and recesses on the corresponding other hub, are arranged so as only to provide for a locking position in the unfolded or open configuration. To lock the push chair in the closed configuration some other means is provided (as described herein - Velcro ®, latch etc).

[0034] According to a further aspect of the present invention, there is provided a foldable vehicle comprising: a central body extending across the vehicle, a handle assembly for engagement by a user to push the vehicle; at least three wheel supporting legs rotatable around the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first hub forming part of the central body and the rearward extending leg is connected to a second hub forming part of the central body; an axial lock having a plurality of fingers or protrusions for engaging a hub, the hub comprising recesses for receiving the locking fingers of the axial lock, the recesses being positioned on the hub so as to define at least a first locking position in which the axial lock locks the first and second hubs with the vehicle in an unfolded configuration and a second locking position in which the axial lock locks the first and second hubs with the vehicle in a folded configuration.

[0035] A vehicle is provided including an axial lock having a plurality of fingers or protrusions for engaging a hub. The hub is provided with recesses for receiving the locking fingers of the axial lock, the recesses being positioned on the hub so as to define at least a first locking position in which the axial lock locks the hub with the pushchair in an unfolded configuration and a second locking position in which the axial lock locks the hub with the pushchair in a folded configuration. The lock may be fixed rotationally on the axis of rotation of the hub such that when the fingers or protrusions of the axial lock are engaged with the respective recesses of the hub, the hub will also be locked rotationally on the axis of rotation. This has the effect of locking the leg(s) of the vehicle (coupled to the hub) in a particular position. According to a further aspect of the present invention, there is provided a system for locking a foldable vehicle, such as a push chair, in which the vehicle has a central body extending across the vehicle, a handle assembly for engagement by a user to push the vehicle; at least three wheel supporting legs rotatable around the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first hub forming part of the central body and the rearward extending leg is connected to a second hub forming part of the central body, the system comprising an axial lock having a plurality of fingers or protrusions for engaging a hub, the hub comprising recesses for receiving the locking fingers of the axial lock, the recesses being positioned on the hub so as to define at least a first locking position in which the axial lock locks the first and second hubs with the vehicle in an unfolded configuration and a second locking position in which the axial lock locks the first and second hubs with the vehicle in a folded configuration.

[0036] According to a further aspect of the present invention, there is provided a system for locking a vehicle such as a pushchair, in which the vehicle has a central body extending across the vehicle, a handle assembly for engagement by a user to push the vehicle; at least three wheel supporting legs rotatable around the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first hub forming part of the central body and the rearward extending leg is connected to a second hub forming part of the central body, the system comprising an axial lock having one or more (preferably a plurality of) fingers or protrusions for engaging the first and second hubs, each of the first hub and second hub comprising one or more recesses for receiving the locking finger(s) of the axial lock, the one or more recesses being positioned on the first and second hub so as to define at least a locking position in which the axial lock locks the first and second hubs with the pushchair in an unfolded configuration. As used herein, it will be appreciated that “hub” refers to a part or component of the central body. No structural shape or specification is required by use of the term. However, it is preferable that the hubs are generally cylindrical so as to enable maintenance of the form of the body of the vehicle as the hub (with the leg connected) rotates. In this aspect it will be understood that the axial lock having one or more fingers is arranged to lock the pushchair in the open configuration (i.e. the configuration in which the pushchair is open such that an infant or passenger can sit in it). In such an arrangement the recesses in the hubs are provided to be shaped accordingly and to define the areas or regions of circumferential or arc overlap to enable the finger(s) to lock the pushchair in the open configuration. A detailed example is described below with reference to Figures 6 and 7 and the skilled person will understand the possible use with a situation in which there is only one locking position. In the closed configuration, the axial lock can also be used but alternatively some other means of locking the pushchair can be used. For example a manual strap securable by Velcro ® or some other manually activatable or usable means can be provided. A manual or automatic latch can be used.

[0037] According to a further aspect of the present invention, there is provided a system for locking a foldable vehicle such as a push chair, comprising a central body extending across the vehicle, a handle assembly for engagement by a user to push the vehicle; at least three wheel supporting legs rotatable around the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first hub forming part of the central body and the rearward extending leg is connected to a second hub forming part of the central body; the system for locking comprising an axial lock having a plurality of fingers or protrusions for locking the first and second hubs and preventing relative rotation of the first and second hubs, at least one of the first and second hubs comprising recesses for receiving the locking fingers or protrusions of the axial lock, the recesses being positioned on the first and / or second hub so as to define at least a first locking position in which the axial lock locks the first and second hubs with the vehicle in an unfolded configuration and a second locking position in which the axial lock locks the first and second hubs with the vehicle in a folded configuration.

[0038] A vehicle such as push chair including this system for locking the foldable vehicle is also provided.

[0039] In each of the aspects provided herein, the system for locking the vehicle is also provided independently of the vehicle. The description below relates to foldable vehicles including features not forming part of the system for locking the vehicle, e.g. the legs, wheels, handle etc. The skilled person will understand that the systems for locking described below as part of the vehicles are also disclosed and provided as independent aspects.

[0040] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which:

[0041] Figure 1 A is a schematic view of a push chair;

[0042] Figure 1 B is a schematic view of an alternative chassis for the push chair of Figure 1 A;

[0043] Figures 2A to 2C are examples of a folding push chair at various stages of a folding process;

[0044] Figures 3A to 3C show a schematic view of the components of a hub locking system for a pushchair;

[0045] Figures 4A to 4C show a schematic view of the components of the hub locking system of Figures 3A to 3C;

[0046] Figures 5A to 5C show a schematic view of the components of the hub locking system of Figures 3A to 3C;

[0047] Figures 6 and 7 show an example of a possible layout of the fingers in a hub locking system for a pushchair such as that shown in Figures 3A to 3C; and

[0048] Figures 8 and 9 show alterative examples of axial locking members included within hubs.

[0049] The invention provides a push chair in which a central body is provided. A handle assembly is provided with which a user can engage to push or pull the push chair. The handle assembly is preferably either directly or indirectly connected to the central body (or indeed to any other part of the push chair such that engagement with the handle assembly causes the push chair to be moved in a desired direction). Extending from the central body there are provided at least three wheel supporting legs rotatable around central body, e.g. around a central axis of the central body. The at least three wheel supporting legs extend from the central body and include one or more wheel supporting legs extending in a forward direction from the central axis and one or more wheel supporting legs extending in a rearward direction from the central axis. The one or more wheel supporting legs extending in a forward direction from the central body and the one or more wheel supporting legs extending in a rearward direction from the central body may simply be referred to as front legs and rear legs respectively.

[0050] As mentioned above, throughout the present description the embodiments described will be mostly examples of push chairs. However, the present system and method are not limited to push chairs. The present system and method are applicable to any type of foldable vehicle and other examples, include shopping trolley, golf trolleys, wheelchairs and the like. Given that the majority of the description relates to the embodiment as a push chair reference is made to the presence of a seat. However, it will be appreciated that the presence of the seat is not essential. In some examples, no seat will be present, e.g. in the case of a shopping trolley or a cart for golf clubs.

[0051] In one example, the push chair is arranged such that when being folded, i.e. , changing from an unfolded state to a folded state, the legs are arranged to rotate in the same direction towards the handle, i.e., they are arranged to rotate substantially upwards from their position to a closed or folded state in which the legs are adjacent to the handle.

[0052] The legs are preferably connected to hubs which form part of the central body.

[0053] Figure 1 a is a schematic view of a push chair. The push chair 2 comprises a central body 4 or chassis, to which is provided a connected handle assembly 7 including one or more generally upright members 8. A seat 6 is provided coupled to the central body 4. The seat is preferably sized and shaped to provide comfortable support for an infant or small child, as is well known in push chairs. Forward directed legs 12 are provided as are rearward extending legs 14 also coupled to the central body 4. Wheels 16 are provided at the end of the legs to enable a simply rolling of the push chair.

[0054] The central body 4 may be substantially straight, i.e., has the form of a straight cylinder of uniform cross-section. However, preferably the body will be v shaped, i.e., as shown in Figure 1 b. The central body can be any suitable or desired shape. In the case of a V shape body, what is meant is that the body has two straight or substantially straight cylindrical parts that come together at a centre at some angle (preferably an obtuse angle between 90 and 180 degrees). Figures 2A to 2C show an example of a push chair such as that described in our granted patent GB2591211 , referred to above. However, the push chair shown includes a system for enabling locking of the push chair in the folded or unfolded configurations of Figures 2A and 2C, respectively.

[0055] Looking at Figure 2A, a central body 4 is provided to which, in this example, is connected a handle assembly 7. The handle assembly extends generally upwardly, i.e. away from the ground and preferably at some angle to the vertical to make pushing of the push chair comfortable for a user. Wheel supporting legs 12 are provided extending in a forward direction and wheel supporting legs 14 are provided extending in a rearward direction, i.e. forward and rearward with respect to the direction of movement of the push chair as it is pushed in normal use. The handle assembly is coupled either directly or indirectly to the central body.

[0056] In some configurations (dependent on whether the vehicle is of a type that includes a seat) a seat 6 is provided connected to the vehicle. In the case of a push chair, seat 6 is provided connected directly or indirectly to the central body 4 of the push chair. Typically, the forward direction will be the direction that a child or baby sitting in the push chair will be facing although it is of course possible that the seat be positioned such that a passenger faces rearwardly as well or instead. Wheels 16 are provided at the distal ends of the front and rear extending legs.

[0057] As the push chair is changed from an unfolded state (shown in Figure 2A) to a folded state (shown in Figure 2C), the legs 12 and 14 are coupled together such that they rotate in opposite directions around the central body 4 to the closed position shown in Figure 2C. Thus, in this example, the rear legs and front legs effectively sandwich the seat and the handle assembly 7 between them in the folded state. If a seat is not provided, the rear and front legs sandwich the handle assembly only.

[0058] Figure 3 shows the component parts of a locking system for enabling locking of a pushchair such as that of Figures 1 and 2, in either an open or closed configuration. The components shown in Figure 3 might typically be provided in one side only of the V shaped chassis shown in the pushchair of Figures 1 and 2. Similar components would be provided on the other side of the V-shape. Furthermore, such a system could be provided on a chassis that was not V- shaped but rather straight or cylindrical or indeed any other appropriate shape. What is important is that the wheel supporting legs are coupled to or form part of the central chassis such that control or locking of the angular position of the hubs serves to lock the wheel supporting legs in a desired position.

[0059] Referring to Figures 3A to 3C, component parts of the hub locking mechanism are shown in exploded form. The locking mechanism comprises a multi-fingered latch member 20. The lock is referred to as having “fingers” but in fact any sort of protrusion could be used. Throughout the description reference will be made to fingers although the skilled person will understand that any suitably shaped protrusion can be used (see for example some non-limiting examples shown in Figures 8 and 9 and described below). Further, it is preferred that a plurality of fingers is provided on the latch member 20, but it will be appreciated that a latch member with a single finger or protrusion can also be used.

[0060] Hubs 22 and 24 are provided respectively coupled to legs or leg attachments 26 and 28, i.e. attachments to which the legs themselves can be fixed or mounted. As can be understood, the hubs form part of or are connected to the central body. The hubs are referred to as such, in that they are components or parts of the central body that are arranged to rotate about an axis to enable movement of the legs of the vehicle as described herein. The expression “hubs” will be used throughout but is to be construed and understood in this broad manner. As noted the hubs (or components or parts) can be cylindrical in shape or can have any suitable shape.

[0061] In the example shown, the hub 22 and leg 26 are for one of the front legs of a push chair, and the hub 24 and leg 28 are for one of the rear legs of a push chair.

[0062] The hubs 22 and 24 are arranged to rotate on a shaft (not shown) and preferably operate under a system of planetary gears including gear 30 seen on hub 24. The shaft (not shown) would typically be arranged within the generally axial openings 32 visible on each of the multi-fingered latch member 20, and hubs 22 and 24.

[0063] First openings 34 are provided on the first hub 22. Second openings 36 are provided on the second hub 24. The size and shape of the openings 34 and 36 are selected and configured to enable the fingers 38 to slide axially within them.

[0064] A biasing member 40, in this example in the form of a helical spring, is arranged to bias the multi-fingered latch member 20 in a direction to the right in Figure 3, or more generally so as to encourage the fingers 38 to enter the holes within the hubs. The relative angular position of the first hub 22 and second hub 24 will determine how far the locking member can move axially. Given the bias provided by the spring 40, the fingers of multi-fingered latch member 20 will always be axially within the holes 34 in the first hub 22.

[0065] The multi-fingered latch member 20 is arranged to be able to move longitudinally along the hub or central axis 31 and also to rotate around the central axis 31 . The linear axial movement of the multi-fingered latch member 20 enables the individual fingers 38 to slide axially within the openings 34 and 36 within the hubs 22 and 24, respectively. Accordingly, the linear or axial movement of the member 20 is for engaging the hubs 22 and 24 and to reconfigure the system from being in a locked state into an unlocked state or vice versa.

[0066] The hubs are able to rotate relative to each other about axis 31 which has the effect of “opening” or “closing” the pushchair. When the fingers extend all the way through the first opening 34 in hub 22 and extend into the second opening 36, the angular position of the hubs is locked. In other words, the legs will be fixed in the positions corresponding to the angular position of the hub at that time. To enable angular movement of the hubs relative to each other the fingers 38 must be axially withdrawn from the second opening 36, as will be explained below.

[0067] Thus, the multi-fingered latch member 20 is able to lock the hubs 22 and 24 either when in the open configuration or the closed configuration of the push chair itself. In one example, the multi-fingered latch member 20 is configured only to be able to lock the hubs 22 and 24 in the open configuration, i.e. a configuration in which the pushchair is open such that it can be occupied by a child or infant. When configured so as only to be able to lock the hubs 22 and 24 in the open configuration, some other means is preferably provided to enable the push chair to be locked in the closed configuration, e.g. a Velcro ® fastener, a latch etc

[0068] The hubs 22 and 24, themselves are able to rotate about the axis of the shaft (not shown). They are able to rotate relative to each other about the shaft but are not able to move axially or longitudinally along the axis of the shaft.

[0069] The biasing member or spring 40 is arranged to bias the multi-fingered latch member 20 into a locking position. In the example shown, the biasing member 40 is provided as a heliacal spring. However, any suitable alternative can be used. In one example, a rubber puck is used or alternatively a hydraulic device or electrical or mechanical means can be used so as to bias the member 20 into the locking position. Indeed, any suitable components can be used that are able to push or bias the member 20 in the rightwards direction (as seen in Figure 3, i.e. towards 24 and 36).

[0070] Hub 22 has a first set of through holes 34 which are sized and arranged to correspond to the fingers 38 of the multi-fingered latch member 20 (see Figure 6B). The multi-fingered latch member 20 is able to move in an axial direction through the hub 22. The first openings 34 are shaped and sized to allow axial movement of the fingers 38 within them, but serve to support the fingers 38 when exposed to twisting movements. In other words, the multi-fingered latch member 20 and the first hub are not able to rotate relative to each other.

[0071] It will be appreciated that for the fingers 38 to pass into the holes 36 in the second hub 24 in the axial direction 39, there must be a corresponding opening or hole 36 for each and every one of the fingers 38. If any of the fingers encounters the end face 42 of the hub 24, then the multifingered latch member 20 will not have engaged rotationally with the hub 24 and therefore relative rotation, subject to the interaction of the gears or whatever other mechanism is used, will be possible about the axis of the shaft. In this configuration the hubs and legs are not locked and can rotate relative to each other about the axis 31 .

[0072] The second openings 36 provided in the hub 24 are shaped so as to define two possible engagement (locking) positions for the fingers 38 of the multi-fingered latch member 20.

[0073] The multi-fingered latch member 20 is generally cylindrical in shape although other appropriate shapes could be used. In this example, the multi-fingered latch member 20 is in effect an open cylinder with circular cross-section with the fingers 38 defined by part of the cylindrical walls. The absence of a fingers is in effect a cutout from the cylinder. The circumferential distribution of the fingers can be understood most clearly looking at Figure 6A. As can be seen, in this example the arc distance between the fingers is different for each pair of adjacent fingers. The arc length (C1) of the fingers themselves is the same although in some examples this is varied.

[0074] As mentioned above, one or more fingers are provided. An example in which two fingers can be provided is possible, although preferably at least three fingers are provided. In some examples more are provided. In one example, 10 fingers are provided, but more can work.. Having at least three fingers ensures that the shear forces are never beyond (or at least reduces the risk that they will be beyond) what the materials can bear. The materials from which the described components are manufactured can be selected based on factors such as strength, weight and cost. Typically the lock or latch is manufactured from steel or possibly aluminium. Titanium can also be used. Indeed any selection from materials including metals, plastics, composites can be used. In one example acetal is used for any or all of the components..

[0075] Referring to Figure 4, the fingers 38 can be seen to have passed through the first openings 34 in the hub 22. As shown, they now project axially beyond the face of the first hub 22 that is axially closest to the face 42 of hub 24.

[0076] The relative angular position of the hubs 22 and 24 will determine whether or not the fingers 38, once they have passed through the holes 34, are able to enter the holes 36 on the second hub 24. The arrangement of the holes 36 on the second hub 24 is preferably selected so that there are two possible locking positions. In one example however, it could be that only a single locking position is provided, having a different means for retaining the wheels in the folded position, e.g. a Velcro or fabric / textile band or belt.. In the first locking position (when two are provided), the legs 26 and 28 coupled to the hubs 22 and 24, will be in the open position as shown in Figure 2A. In the second, the legs will be locked in the closed position as shown in Figure 2C.

[0077] When the legs are in the position shown in Figure 2B, i.e. , moving between the open and closed position, the fingers 38 will have retracted from the holes 36 in the second hub 24. Thus, rotation around the longitudinal axis 31 of the shaft is possible for the hubs 22 and 24. In this configuration, until the holes 36 are aligned in their second possible alignment position, the fingers 38 will slide over the end face 42 of the second hub 24. In another embodiment, , to allow 2 different locking positions the fingers could also be positioned at different distances from the central axis of the central body or hub. This could be used solely to differentiate the 2 positions or in combination with the system described above, when all fingers are at the same radial distance from the axis but with different phases as described with reference to Figures 6 and 7 below..

[0078] Figure 5 shows an engagement position in which the fingers 38 are engaged with holes 36 in the second hub 24. Although a spacing is shown between the first and second hubs 22 and 24, in practice, these can be more closely aligned. In other words, there can be no axial separation between them or alternatively some buffer may be provided to minimise frictional interactions. In the example above, a multi-fingered latch member 20 is used to lock the position of two hubs, each with a leg attached, so as to lock the legs of a vehicle in either one of two possible positions. In another example, a dedicated axial lock is provided for each hub, such that each of the hubs can be locked rotationally relative to the central body. In this example, a vehicle is provided including an axial lock having a plurality of fingers or protrusions for engaging a hub. The hub is provided with recesses for receiving the locking fingers of the axial lock, the recesses are positioned on the hub so as to define at least a first locking position, e.g. in which the axial lock locks the hub with the pushchair in a folded configuration and a second locking position in which the axial lock locks the hub with the pushchair in an unfolded configuration. The lock is preferably fixed rotationally on the axis of rotation of the hub such that when the fingers or protrusions of the axial lock are engaged with the respective recesses of the hub, the hub will also be locked rotationally on the axis of rotation. Thus, the leg(s) of the vehicle (coupled to the hub) are locked in a particular position.

[0079] As explained herein in one example the axial lock is arranged to lock the pushchair in an open position for use (“the “first locking position”). It is preferred that the axial lock also functions to lock the pushchair in the second closed position although alternative means can be provided for clocking the pushchair in the closed position, e,g. a strap, a Velcro closure mechanism, a manually or automatically actuatable latch etc..

[0080] All other features of the system described and claimed herein with respect to the examples in which a lock engages with or forms part of plural hubs also apply to the example in which a dedicated lock is provided for each hub.

[0081] Referring to Figure 3 again, the multi-fingered latch member 20, comprises an engagement portion 44. The engagement portion 44 is of generally cylindrical form but can be of any shape or form and includes a notch 46 which can be used to control or drive axial movement of the latch member 20 so it can be forced against the bias of the spring 40. If electrical, hydraulic or mechanical activation or control is used a spring is not needed to provide bias, but can still be included if desired.

[0082] A suitable mechanism to counter the biasing force of the spring 40 and therefore to enable release of the latch 20 is preferably activated by a button or other such control provided on the handle 7 of the push chair. Although not shown in the current example, the skilled person will understand that any suitable mechanism can be provided that enables a force to be provided on the multi-fingered latch member, to counter the biasing axial force of the spring 40.

[0083] In one example a mechanical device such as a twisting telescopic rod is used or alternatively, an activating wire or a hydraulic system is provided. In one preferred example an electronic remote-controlled system is used to drive axially the locking member 20 against the biasing force of the spring 40.

[0084] Referring to Figures 6 and 7, the possible layout of the fingers 38 relative to the openings 34 and 36 provided on the hubs 22 and 24 respectively.

[0085] In an example, the circumferential length or extent of the fingers is shown as C1 . This corresponds to the angular size of the arc over which the end face of each of the fingers extends. In the first hub, the size of each of the openings 34 is the same and also extends over a n arc length of C1 . In the second hub 24, the sizes, e.g. arc sizes, or circumferential extent or length, of the openings 36, together with their position on the face 42, are not the same as on the first hub 22. Some are the same, i.e. C1 , but some are longer C2, which provides a flexibility in terms of the possible relative positions of the tow two hubs that would accept the fingers of the lock 20. In other words, the fingers do not move rotationally relative to the first hub 20, but when the lock has withdrawn axially from the second hub, such that the first and second hubs can rotate relative to each other (about axis 31), the configuration of the openings 36 in the second hub are such that at least a second (and preferably only a second) possible locking position exists, as shown in Figure 7. The configuration of the fingers and the openings is suitable for the specific example, but it will be understood that other configurations can be used instead. For example, as mentioned above the openings and fingers can be arranged such that they are not all at the same radial distance from the axis of rotation.

[0086] Alternatively or in addition, the fingers can have a narrower shape (e.g. the shape of a cylindrical rod), and in this example, it can be that no opening needs to be longer (such as C2) since in that case the 2 locking positions would never overlap.

[0087] Indeed, referring to Figure 7, the two possible relative positions of the multi-fingered latch member 20 and the holes 36 within the second hub 24 can be seen. It will be appreciated that in both cases, the fingers 20 will be arranged within the holes 34 of the first hub 22 and for that reason it is omitted for clarity. The holes 36 on the second hub 24 are shaped and configured to have the appropriate circumferential extent so as to provide two locking positions for the fingers 38 and therefore for the relative angular position of the first hub 22 with respect to the second hub 24.

[0088] In the example shown, the multi-fingered latch member 20 comprises five fingers which generally elongate and have rounded rectangular end faces. This is so as to ensure that if there is any sliding of the end faces of the finger members 20 on the end face 42 of the second hub 24, the frictional interaction will be minimal. Furthermore, the absence of sharp edges ensures that there is no risk of damage to the second hub 24. Furthermore, the angled sides of the end faces 46 of the fingers serve as guides or cam surfaces, to guide the fingers 38 into the holes 36 on the second hub 24. The fingers can be any suitable shape or form.

[0089] As mentioned, in the example shown, five fingers 38 are shown as part of the multi-fingered latch member 20. However, in another example, three fingers are provided. The skilled person will understand that the number of fingers can be varied. It is preferred that at least four fingers are provided to ensure that the distribution of the torsional locking forces is spread around the locking member 20.

[0090] Preferably, the multi-fingered latch member 20 is formed of a rigid material having at least an outer surface with a low coefficient of friction. Alternatively, or in addition, the multi-fingered latch member 20 (or the fingers thereof) can be coated with a low-friction material to facilitate sliding of the fingers within the holes of the first hub 22, into or out of the holes of the second hub and for the end faces 46 of the fingers into and out of the holes 36 on the second hub 24.

[0091] In one example, the surface 42 on hub or part 24 is covered or coated with a material, e.g. a metal, to decrease ware. In addition the hub 24 can be provided with reinforcements at the edges of the slots.

[0092] In another example, the latch member and the first hub are an integrated component. The plurality of locking fingers for engaging the second hub extend from the first hub and engage recesses in the second hub. The recesses in the second hub are positioned to define at least a first locking position in which the axial lock locks the first and second hubs with the pushchair in a folded configuration and a second locking position in which the axial lock locks the first and second hubs with the pushchair in an unfolded configuration. To move from one position to a second position the first and second hubs are controlled to move apart axially so that the fingers move out of the recesses in the second hub and the first and second hubs can rotate relative to each other.

[0093] The legs are preferably coupled together and / or to the central body in such a way that as they move from an unfolded state shown in Figure 2a, to a folded state shown in Figure 2c, they fold upwards, i.e. , away from the ground upon which they will be positioned in use and in opposite directions (see the arrows in Figures 2B and 2C) around the central body 4. Thus, in this nonlimiting configuration, in a closed or folded state shown in Figure 2C, the front legs 12 sandwich the seat 6 against the handle assembly 7.

[0094] The legs 12 and 14 can also be arranged such that they all rotate in the same direction around the central body. In this configuration, in the closed state the front and rear legs will be on the same side of the handle assembly, either directly adjacent (if they folded anti-clockwise - arrow 13 in in Figure 2B), or sandwiching the seat (if attached) between them and the handle assembly, if they rotated clockwise (arrow 15 in Figure 2B).

[0095] The handle assembly 7 is preferably arranged to remain fixed angularly with respect to the central body 4, such that it does not rotate relative to the body. It is the legs 12 and 14 that both rotate, in the same direction around the central body 4 to the folded position (and when unfolding, in the same, but opposite direction).

[0096] To achieve the process of folding the push chair, a user can hold the handle assembly 7 and activate a mechanism (not shown) which can automatically fold the legs upwards such that the handle assembly need not at any point come in contact with the floor or ground. The first stage of such a process will require the axial withdrawal of the multi-fingered latch member 20 from the second hub, or more specifically the fingers of the latch member 20 from the holes 36 of the second hub 24.

[0097] Figures 8 and 9 show alterative examples of axial locking members included within hubs. Looking at Figures 8A and 8B a hub 46 is shown including an axial locking member 44 (Figure 8B shows the axial locking member in isolation). The axial locking member has a number of protrusions 48. As can be seen in this example here are 7 such protrusions provided spaced circumferentially around the member 44. The spacing and dimensions of the members 48 and the recesses on the adjacent hub into which they move, is again (as described above) determined so as to enable a desired number of secure locking positions. Thus as the hubs rotate relative to each other the protrusions can engage with parts (recesses or openings) on a corresponding adjacent hub (not shown for reasons of clarity).

[0098] As in the example above shown in Figure 3 a spring (40 in Figure 3) can be provided to bias the protrusions in a desired position. In the examples of figures of 8 and 9, the spring may be provided entirely within the hub, e.g. underneath the hub between or the axial locking member and the hub in which it is positioned.

[0099] This example has the benefit that due to the lower profile of the protrusions (they can be considered “teeth” or “turrets” instead of “fingers”) they have greater resistance to shear and less flexibility and so can be made of materials that are less strong than if they were longer. In one example a plastic or composite material can be used instead of a metal.

[0100] Figure 9 shows another example of a hub 50 with an axial locking member 52 arranged within it. Splines 54 (four of them in this example) are provided to fix the relative angular position between the axial locking member 52 and the hub itself 50. In the example of Figures 8A and 8B the protrusions in effect also function as splines to fix the relative angular position between the axial locking member 44 and the hub 46 itself and so additional splines are not required.

[0101] Protrusions 56 are provided around the axial locking member 52 which again as in the examples described are arranged to interact and engage with corresponding recesses provided on an adjacent hub (not shown for clarity). The sizes and optionally spacing of the recesses provided on an adjacent hub and the sizing of the protrusions themselves are selected such that as the hubs rotate relative to each other the protrusions can engage with parts (recesses or openings) on the adjacent hub to enable relative rotational locking.

[0102] The operation of the axial locking members 44 and 52 thus correspond to that of the member 20 shown in and described above with reference to Figure 3.

[0103] Finally, as regards Figures 8A and 8B it is noted that the three long members seen projecting from the plane of the surface do not relate to the locking functions as described herein and far as that function is concerned can be omitted.

[0104] Throughout reference to provision of a seat is made. It will also be understood that other attachments can be coupled directly or indirectly to the central body of the vehicle. Non limiting examples include a car seat, a carry cot, a forward or rear facing seat, a hammock seat, and a stroller seat.

[0105] In any of these methods of folding, it can be appreciated that the legs are arranged to fold upwards away from the ground to be in a position adjacent the handle in a folded state. When the front an drear legs fold in opposite directions around the central body, in the folded configuration, the handle assembly and seat if present are sandwiched between the front and rear legs, If the legs fold in the same direction but ultimately end up adjacent to the handle assembly then, if they have folded backwards they will be on the opposite side of the handle assembly from the seat, and if they have folded forwards then the front and rear legs will be on one (the same) side of the seat and the handle assembly will be on the other.

[0106] In addition, in one example, the legs could fold downwards such that in the folded configuration the front and rear legs come together but are not adjacent the handle assembly. It will be understood that the locking mechanism described herein is applicable irrespective of the direction relative to the central body in which the legs rotate when moving to a folded configuration from an unfolded configuration (or vice versa).

[0107] The mechanism by which the legs are coupled and arranged for rotation may be the same as that described in our granted patent GB2591211 .

[0108] The mechanism and systems of our other granted patents or co-pending applications including GB259106, PCT / IB2019 / 000770, PCT / IB2019 / 000775, or indeed of any of the patents or patent applications of the present applicant can also be incorporated into the push chair as disclosed herein.

[0109] The gearing arrangements used in the push chairs of GB259106 and GB2591211 to ensure the operation of the folding or unfolding of the push chair are particularly suitable.

[0110] As described therein, each hub is provided with internal spur gear teeth comprising the annulus of the gear assembly. An internal chassis is rotatably mounted on shaft. Planet gears are mounted on the internal chassis so that they engage with the spur gear teeth of the annulus. In an alternative example, a shuttle mechanism such as that described in our application W02022 / 101517, could be used to control rotation of the vehicle legs. In one example, when assembled, the forward extending leg and rearward extending leg are connected by an epicyclic gear train so that as the push chair is folded, the two legs will rotate in opposite directions as the chair is folded or unfolded.

[0111] In another example, one or more motors can be provided coupled to the legs to cause the rotation of the legs (when not in a locked state) about the central body when desired or selected by a user. Any suitable mechanism can be used to cause or control rotation of the legs about the central body.

[0112] A number of preferred and possible features of a push chair will now be described. Any appropriate combination of these features can be provided in an exemplary push chair.

[0113] The folding of the legs may be manual or electrical. All the legs rotate in the same direction (or opposite directions) however the legs may rotate at different speeds. The legs may rotate forwards or backwards. The legs may be coupled or connected together or alternatively they may move independently.

[0114] In one example, the legs move in a specific sequence to ensure the push chair can be folded to its smallest dimensions. The front legs may rotate first followed by the back legs (or vice versa).

[0115] In one example, the speed of the leg movement is controlled. The push chair is preferably configured such that a user has the option to fold all legs at the same time manually or under electronic control, i.e. a connection between each of the legs that gets pulled or released so all legs fold simultaneously in one movement.

[0116] The legs may contain sensors (if movement is electrical) and in one non-limiting example, the legs contain a charging point. Alternatively, the charging point is provided in the central body of the push chair or within or on any other suitable location on the push chair.

[0117] The movement of the back legs may trigger the folding of the front legs (or vice versa). In one example, a locking mechanism or means is provided so that the legs may be locked when folded and / or opened.

[0118] Preferably, the push chair may be held (lifted) by a user to allow for legs to move from the open unfolded configuration to the closed folded configuration. Preferably to move from the folded configuration to the unfolded configuration the vehicle is held (lifted) by a user to allow for legs to move freely, i.e. without contact with the ground for at least part of their movement.

[0119] In one example the method of folding or unfolding the chair comprises positioning the push chair on its side to enable folding or unfolding of the legs.

[0120] The legs may have a mechanism such as a hydraulic or mechanical element to control the legs when released from their folded to unfolded state (or vice versa)

[0121] In one example, the legs are shaped to fold into each other for improved foldability i.e. curved or thin profile. Thus, in a folded configuration the legs are shaped such they in effect tesselate.

[0122] The use of a V-shaped central body allows legs to fold in such a way that when folded the vehicle is smaller in all three dimensions.

[0123] In one example, the legs are shaped to allow for easy foldability when rotating.

[0124] In another example, the legs are provided with an additional part made from another material to protect the legs from contact with the ground during a folding process or operation. In an example the wheels may have a cover such as a mud guard to prevent dirt or debris from the ground contacting the seat or the handle assembly when the push chair is in a folded configuration.

[0125] In one example, the legs are arranged to fold without manual interaction, e.g. the legs are arranged to fold under control of electronic control system or a motor(s).

[0126] In one example, all of the legs have the same profile, whereas in another example the legs have complementary profiles so as to be able to assume a compact configuration when in the folded state.

[0127] The legs are able to fold or unfold with the wheels attached or detached, or, if provided, with one or more baskets of the push chair attached / detached. The legs are also able to fold or unfold with the seat attached in some configurations.

[0128] Folding of the legs may be operated by a parental handle or on any other component or piece of the push chair as a whole. Each of the legs of the push chair may have attached to it a wheel in which all the wheels of the push chair are the same size wheels. Alternatively, different size wheels can be provided, e.g. larger wheels on the rear directed legs, and smaller wheels on the front directed pointing legs. Can be folded with wheels attached irrespective of the size of the wheels, i.e. even if the wheels are large.

[0129] The legs or wheels or handle or handle bar may contain or include a braking mechanism for the push chair.

[0130] The push chair legs can be arranged such that they can protect the textile seat when provided) of the push chair when they are in a folded configuration. In addition the legs can be configured such that when they close they do not contact a user.

[0131] The push chair can fold or unfold with the seat attached.

[0132] One or more of the legs may be positioned higher than another leg when in the folded configuration.

[0133] The legs or the central body may contain an inbuilt stand for ease of storage or the have a stand attached to the legs.

[0134] In one example, the legs may have a magnetic element to support in folding or locking once folded.

[0135] In one non-limiting example, a single button or switch is provided and activation or pressing of the button or switch may release all legs for folding. In this example, the activation of the button causes axial movement of the member 20 to enable relative rotation of the first and second hubs. If two such members 20 are provided (one on each branch of the V), then activation of the button can cause both members 20 to move axially in an appropriate axial direction, to allow relative rotation of the hubs on the respective branch of the V.

[0136] As noted above, the present system in one aspect requires a foldable vehicle comprising: a central body extending across the push chair, a handle assembly for engagement by a user to push the vehicle; at least three wheel supporting legs rotatable around the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction. The legs are arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first part of the central body and the rearward extending leg is connected to a second part of the central body. An axial lock is provided having a plurality of fingers or protrusions for engaging the first and / or second parts. Each of the first part and second part comprises recesses for receiving the locking fingers of the axial lock. The recesses are positioned on the first and second parts, so as to define at least a first locking position in which the axial lock locks the first and second parts with the pushchair in a folded configuration.

[0137] The engagement of the fingers or protrusions with the recesses in one example comprises the fingers or protrusions being extendable from the axial lock when the recesses of the first or second parts are aligned with the fingers or protrusions. Thus, when the openings are not aligned with the fingers or protrusions, the fingers or protrusions are forced back into the plane of the end face of the axial lock. In other words, the axial lock might preferably be positioned between the first and second parts (hubs) and closely adjacent to them. Unless there is alignment between the openings in the parts (hubs) and the fingers or protrusions, they will kept pressed into the body of the lock. When the lock rotates such that the fingers do align, they can extend into the openings and thereby lock the part or hub in its rotational position with the axial lock. Alternatively, the axial lock could comprise fingers or protrusions extendable from one part, i.e. the first hub, when the recesses of the second hub are aligned with the fingers or protrusions.

[0138] Embodiments of the present invention have been described with particular reference to the examples illustrated. However, it will be appreciated that variations and modifications may be made to the examples described within the scope of the present invention.

Claims

Claims1. A foldable vehicle comprising: a central body extending across the vehicle, a handle assembly for engagement by a user to push the vehicle; at least three wheel supporting legs rotatable around the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first hub forming part of the central body and the rearward extending leg is connected to a second hub forming part of the central body; an axial lock having a plurality of fingers or protrusions for engaging the first and second hubs, each of the first hub and second hub comprising recesses for receiving the locking fingers of the axial lock, the recesses being positioned on the first and second hub so as to define at least a first locking position in which the axial lock locks the first and second hubs with the vehicle in an unfolded configuration and a second locking position in which the axial lock locks the first and second hubs with the vehicle in a folded configuration.

2. A foldable vehicle according to claim 1 , in which the hubs are cylindrical and the recesses in the first hub correspond to the circumferential positions of the fingers protrusions, and the recesses on the second are shaped such that in the second locking position, the fingers extend into different recesses of the second hub than in the first locking position.

3. A foldable vehicle according to claim 1 or 2, in which at least one of the openings in the second hub has a circumferential extent that is longer than the circumferential extent of the fingers or protrusions.

4. A foldable vehicle according to claim 4, in which there are only two rotational positions at which the fingers of the axial lock can enter the openings in the second hub.

5. A foldable vehicle according to any of claims 1 to 4, in which the axial position of the axial lock is movable.

6. A foldable vehicle according to claim 5, in which the axial position of the axial lock is biased into engagement with the recesses of both the first and second hub.

7. A foldable vehicle according to any of claim 6, comprising a biassing member to bias the axial lock into engagement with the recesses of both the first and second hub.8 A foldable vehicle according to claim 7, in which the biassing member is a spring such as helical spring.

9. A foldable vehicle according to any of claims 6 to 8, in which the axial lock has an engagement portion for enabling control of its axial position.

10. A foldable vehicle according to claim 9, in which the engagement portion is a notch.

11. A foldable vehicle according to any of claims 1 to 10, in which the axial lock has at least three fingers or protrusions.

12. A foldable vehicle according to claim 11 , in which the axial lock has five or more up to 10? Fingers or protrusions.

13. A foldable vehicle according to claim 11 or 12 in which the axial lock is cylindrical and the fingers or protrusions of the same circumferential arc length.

14. A foldable vehicle according to any of claims 9 to 13, in which the circumferential arc length of the space between the fingers of each adjacent pair of fingers is different.

15. A foldable vehicle according to any of claims 1 to 14, in which the legs are arranged to fold upwards and in a rearwards direction such that in the folded state the seat and the legs are arranged on opposite sides of the handle assembly when the vehicle is in the folded state.

16. A foldable vehicle according to any of claims 1 to 14, in which the legs are arranged to fold in opposite directions such that in the folded state the front and rear legs sandwich the handle assembly.

17. A foldable vehicle according to any of claims 1 to 16, in which the legs are coupled or connected together for rotation around the central body.

18. A foldable vehicle according to any of claims 1 to 17, in which each of the legs of the push chair have attached to them a wheel in which all the wheels of the push chair are the same size wheels.

19. A foldable vehicle according to any of claims 1 to 18, including a braking mechanism.

20. A foldable vehicle according to any of claims 1 to 19, in which the vehicle is selected from the group including a shopping trolley, a golf trolley or cart, a wheelchair a push chair and the like.21 . A foldable vehicle according to any of claims 1 to 20, comprising a seat connected directly or indirectly to the vehicle body.

22. A method of locking a foldable vehicle in an open or a closed configuration the vehicle comprising, a central body extending across the vehicle, and at least three wheel supporting legs rotatable around the central body and extending from the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction, the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first hub forming part of the central body and the rearward extending leg is connected to a second hub forming part of the central body, the method comprising, axially moving a lock having a plurality of fingers for engaging the first and second hubs, each of the first hub and second hub comprising recesses for receiving the locking fingers of the axial lock, the recesses being positioned on the first and second hub so as to define at least a first locking position in which the axial lock locks the first and second hubs with the vehicle in an unfolded configuration and a second locking position in which the axial lock locks the first and second hubs with the vehicle in a folded configuration .

23. A foldable vehicle comprising: a central body extending across the vehicle, a handle assembly for engagement by a user to push the vehicle;at least three wheel supporting legs rotatable around the central body and extending from the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the one of the forward and rearward extending legs is connected to a first hub forming part of the central body and the other of the forward and rearward extending legs is connected to a second hub forming part of the central body; a plurality of locking fingers or protrusions provided on the first hub for engaging recesses on the second hub, the recesses being positioned on the second hub so as to define at least a first locking position in which the first and second hubs are locked with the vehicle in an unfolded configuration and a second locking position in which the first and second hubs are locked with the vehicle in a folded configuration.

24. A foldable vehicle comprising: a central body extending across the vehicle, a handle assembly for engagement by a user to push the vehicle; at least three wheel supporting legs rotatable around the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first hub forming part of the central body and the rearward extending leg is connected to a second hub forming part of the central body; an axial lock having a plurality of fingers or protrusions for engaging a hub, the hub comprising recesses for receiving the locking fingers of the axial lock, the recesses being positioned on the hub so as to define at least a first locking position in which the axial lock locks the hub with the pushchair in an unfolded configuration and a second locking position in which the axial lock locks hub with the pushchair in a folded configuration.

25. A foldable vehicle according to claim 23 or 24, in which the vehicle is selected from the group including a shopping trolley, a golf trolley or cart, a wheelchair a push chair and the like.

26. A foldable vehicle according to any of claims 23 to 25, comprising a seat connected directly or indirectly to the vehicle body.

27. A system for locking a vehicle comprising a central body extending across the vehicle, a handle assembly for engagement by a user to push the vehicle; at least three wheel supporting legs rotatable around the central body and extending from the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected directly or indirectly to a first hub forming part of the central body and the rearward extending leg is connected directly or indirectly to a second hub forming part of the central body, the system comprising: an axial lock having a plurality of fingers or protrusions for engaging the first and second hubs, each of the first hub and second hub comprising recesses for receiving the locking fingers of the axial lock, the recesses being positioned on the first and second hub so as to define at least a first locking position in which the axial lock locks the first and second hubs with the pushchair in an unfolded configuration and a second locking position in which the axial lock locks the first and second hubs with the pushchair in a folded configuration.

28. A system for locking a vehicle comprising a central body extending across the vehicle, a handle assembly for engagement by a user to push the push chair; a seat for a passenger; at least three wheel supporting legs rotatable around the central body and extending from the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the one of the forward and rearward extending legs is connected to a first hub forming part of the central body and the other of the forward and rearward extending legs is connected to a second hub forming part of the central body, the system comprising: a plurality of locking fingers or protrusions provided on the first hub for engaging recesses on the second hub, the recesses being positioned on the second hub so as to define at least a first locking position in which the first and second hubs are locked with the pushchair in an unfolded configuration and a second locking position in which the first and second hubs are locked with the pushchair in a folded configuration.

29. A system for locking a vehicle comprising a foldable vehicle comprising: a central body extending across the vehicle, a handle assembly for engagement by a user to push the vehicle;at least three wheel supporting legs rotatable around the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first hub forming part of the central body and the rearward extending leg is connected to a second hub forming part of the central body, the system comprising: an axial lock having a plurality of fingers or protrusions for engaging a hub, the hub comprising recesses for receiving the locking fingers of the axial lock, the recesses being positioned on the hub so as to define at least a first locking position, e.g. in which the axial lock locks the hub with the pushchair in a folded configuration and a second locking position in which the axial lock locks hub with the pushchair in an unfolded configuration.

30. A system for locking a vehicle such as a pushchair, in which the vehicle has a central body extending across the vehicle, a handle assembly for engagement by a user to push the vehicle; at least three wheel supporting legs rotatable around the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction; the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first hub forming part of the central body and the rearward extending leg is connected to a second hub forming part of the central body, the system comprising: an axial lock having one or more fingers or protrusions for engaging the first and second hubs, each of the first hub and second hub comprising one or more recesses for receiving the locking finger(s) of the axial lock, the one or more recesses being positioned on the first and second hub so as to define at least a locking position in which the axial lock locks the first and second hubs with the pushchair in an unfolded configuration.

31. A foldable vehicle comprising: a central body extending across the vehicle, a handle assembly for engagement by a user to push the vehicle; at least three wheel supporting legs rotatable around the central body, wherein in the unfolded state, one or more wheel supporting legs extend in a forward direction and one or more wheel supporting legs extend in a rearward direction;the forward and rearward extending legs being arranged such that they rotate around the central body during a folding operation, in which the forward extending leg is connected to a first hub forming part of the central body and the rearward extending leg is connected to a second hub forming part of the central body; an axial lock having a plurality of fingers or protrusions for locking the first and second hubs and preventing relative rotation of the first and second hubs, at least one of the first and second hubs comprising recesses for receiving the locking fingers or protrusions of the axial lock, the recesses being positioned on the first and / or second hub so as to define at least a first locking position in which the axial lock locks the first and second hubs with the vehicle in an unfolded configuration and a second locking position in which the axial lock locks the first and second hubs with the vehicle in a folded configuration.

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