FIELD

The present invention relates to a stroller or pushchair and rear wheel assembly thereof, particularly a stroller or pushchair which is able to transport one infant or child and/or two or more infants or children.

BACKGROUND

Most strollers or pushchairs have one or more front wheel assemblies mounted to a front frame, and two rear wheel assemblies mounted to a rear frame; with the front and rear frames connected at a central hub. In many strollers or pushchairs, a single seat or carrycot is mounted near to the hub; in some case being interchangeable between a forward “world facing” configuration or a rearward “parent facing” orientation.

Some strollers are designed so that they are able to support a seat and a carrycot, or two seats in various configurations, to provide for relatively common situation where parents have children close together. In these situations, a second child often arrives before the first child is independently mobile or mobile for prolonged distance. At this time, rather than having separate strollers or pushchairs for each child, it is generally more convenient for parents or caregivers to have a single stroller which is able to support two occupants.

A variety of approaches to accommodating two occupants on a single stroller have been developed. Some strollers or pushchairs have been developed which have two fixed side-by- side seats; while others have fixed front and rear seats in a line. However, such strollers tend to be big and bulky and difficult to handle; and may not be suitable for the time frame where there is only one child in the family unit.

Accordingly, there is a need for strollers or pushchairs which are reconfigurable to handle situations where there is only one occupant and also situations where there may be two occupants.

One approach to addressing this need is to include a separate additional frame with seat and its own set of attached wheels, although this results in a relatively big and bulky stroller.

In another approach, the stroller or pushchair may be configured so that the single frame includes both seats/ a single seat and a carrycot arranged behind each other on the frame. However in this arrangement a common problem is ensuring the spacing of the seating arrangements of the occupants is far enough from each other so as to be comfortable for the occupants; but at the same time not making the stroller or pushchair too large and unwieldy to handle for the caregiver.

One approach to solving the spacing problem is to make smaller seats for the occupants.

Alternatively, some strollers are configured so that it is possible for a longer wheel base (distance between the front rotation axis of the one or more front wheel assemblies and the rotation axis of the back wheel assembly) by including a removable back axle which can be changed between an original distance and a longer distance. However, such arrangements can be time consuming and inconvenient requiring disassembly and can often still result in a bulky and difficult to manoeuvre stroller.

Accordingly, there is a need to provide a stroller or pushchair which address or at least partially ameliorates some of the above problems and disadvantages of the prior art.

SUMMARY OF THE DISCLOSURE

Features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or can be learned by practice of the herein disclosed principles. The features and advantages of the disclosure can be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims.

In accordance with a first aspect of the present disclosure, there is provided a stroller comprising a lower frame, the lower frame comprising: a front frame section connected to a rear frame section, wherein the rear frame section comprises a rear wheel assembly extending between two rear frame members; wherein the rear wheel assembly is pivotally connected to both rear frame members and having rear wheels attached thereto; the rear wheel assembly movable under the rear frame section between a first load bearing position wherein the rear wheels are retained forward of the pivotal connection and a second position wherein the rear wheels are rearward of the pivotal connection.

Advantageously, in the first load bearing position the rear wheel assembly receives the rear frame members in respective recesses defined therein such that each recess is urged against each rear frame member under load. In the first load bearing position, the recesses of the rear wheel assembly may be channels dimensioned to receive therein a corresponding rear frame member.

Advantageously, in the first load bearing position the rear wheel assembly is releasably retained in said position by a latching mechanism.

Preferably, a tab of each rear frame member includes an aperture for receiving a pivot member engageable with the rear wheel assembly for pivotal connection thereof.

Optionally, the rear wheel assembly may include apertures for releasably securing axles of the rear wheels attached thereto.

The rear wheel assembly may include a void on each side on the upper surface in the second position for receiving corresponding projections therein. The voids may be configured to receive projections of a seat frame or a basket.

Advantageously, the rear wheel assembly includes a web spanning between the rear frame members dimensioned for supporting feet of a child thereupon in at least the second position.

The rear wheel assembly may be positioned under a bar extending between the rear frame members in a first position.

The rear wheel assembly may include a brake paddle actuable in either the first position or the second position to engage and disengage a sliding member from engagement with corresponding apertures defined in hubs of the wheels.

Optionally, the rear wheel assembly may include suspension therein comprising biasing means disposed proximal to each pivotal connection of the rear arm and rear wheel assembly.

The biasing means may comprise first and second springs having different spring constants from each other. The biasing means may alternatively be comprised by a single spring having regions of differential stiffness.

The rear wheel assembly may include suspension assemblies disposed on either side thereof, said suspension assemblies comprising at least one biasing means disposed proximal to each pivotal connection of the rear arm and rear wheel assembly.

The first spring of the suspension assembly is attached at one end within the rear frame such that when the rear wheel assembly is in the second load bearing position, the first spring is disengaged from the suspension assembly. Preferably the second spring of the suspension assembly is arranged so as to be compressible by the suspension assembly in the second load bearing position.

The rear wheel assembly preferably has a face configured to bear against a complementary face on the rear frame assembly in the second load bearing position so as to transfer load applied thereto onto the suspension assembly.

In a further aspect of the present disclosure, there is provided a rear wheel assembly for a stroller comprising: a deck member with two housings configured for receiving at least a portion of the rear frame members of a stroller therein, with said housings having apertures defined therein for pivotal connection therewith; wherein the rear wheel assembly is movable under the rear frame members between a first load bearing position wherein said wheels are retained forward of the pivotal connection with the frame members and a second position wherein said wheels are rearward of the pivotal connection with the frame members.

In yet a further aspect there is provided method of changing a rear wheel assembly pivotally connected to a rear frame section of a stroller from a first load bearing position to a second load bearing position: wherein the method comprises: actuating a latch mechanism to release the rear wheel assembly from the first load bearing position in which two rear frame members of the rear frame section are urged against recesses in the rear wheel assembly and the rear wheels of the rear wheel assembly are located forward of the pivotal connection between the rear wheel assembly and the rear frame of the stroller; and raising the stroller so that that the rear wheel assembly pivots downwardly from underneath the two rear frame members to a second load bearing position wherein the wheels of the rear wheel assembly are located rearward of said pivotal connection between the rear wheel assembly and the rear frame of the stroller.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to describe the manner in which the above-recited and other advantages and features of the disclosure can be obtained, a more particular description of the principles briefly described above will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Understanding that these drawings depict only exemplary embodiments of the disclosure and are not therefore to be considered to be limiting of its scope, the principles herein are described and explained with additional specificity and detail through the use of the accompanying drawings.

Preferred embodiments of the present disclosure will be explained in further detail below by way of examples and with reference to the accompanying drawings, in which

FIG. 1A depicts an exemplary rendered perspective view of an embodiment of a stroller according to the present disclosure in a non-extended position and with a seat in a world- facing orientation.

FIG. 1 B depicts an exemplary rendered perspective view of the stroller of FIG. 1A with one rear wheel removed for clarity.

FIG. 1C depicts an exemplary rendered side view of the stroller of FIG. 1 A.

FIG. 1 D depicts an exemplary rendered side view of the stroller of FIG. 1A with one wheel removed for clarity.

FIG. 1 E depicts an exemplary rendered top view of the stroller of FIG. 1 A.

FIG. 1F depicts an exemplary rendered perspective partial view of the rear portion of the stroller of FIG. 1A.

FIG. 1G depicts an exemplary rendered rear view of the stroller of FIG. 1 A.

FIG. 2A depicts an exemplary rendered perspective view of an embodiment of a stroller according to the present disclosure in a non-extended position and with the seat in a parentfacing orientation.

FIG. 2B depicts an exemplary rendered perspective view of the stroller of FIG. 2A with one wheel removed for clarity.

FIG. 2C depicts an exemplary rendered side view of the stroller of FIG. 2A.

FIG. 3A depicts an exemplary rendered perspective view of an embodiment of a stroller according to the present disclosure in an extended configuration and with the seat in a worldfacing orientation. FIG. 3B an exemplary rendered perspective view of the stroller of FIG. 3A with one wheel removed for clarity.

FIG. 3C depicts an exemplary rendered side view of the stroller of FIG. 3A.

FIG. 3D depicts an exemplary rendered side view of the stroller of FIG. 3A with one wheel removed for clarity.

FIG. 3E depicts an exemplary rendered perspective partial view of the rear portion of the stroller of FIG. 3A.

FIG. 3F depicts an exemplary rendered perspective partial view of the rear portion of the stroller of FIG. 3A with one wheel removed for clarity.

FIG. 4A depicts an exemplary rendered side view of an embodiment of a stroller with two seats in an extended configuration and with one seat in a world- facing orientation, and one seat in a parent facing orientation.

FIG. 4B depicts an exemplary rendered perspective view of an embodiment of a stroller with two seats in an extended configuration, with one seat in a world- facing orientation, and one seat in a parent facing orientation.

FIG. 4C depicts an exemplary rendered side view of an embodiment of a stroller with two seats in an extended configuration both seats in a world- facing orientation.

FIG. 4D depicts an exemplary rendered perspective view of an embodiment of a stroller with two seats in an extended configuration both seats in a world- facing orientation.

FIG. 4E depicts another exemplary rendered side view of an embodiment of a stroller with two seats in an extended configuration and with one seat in a world- facing orientation, and one seat in a parent facing orientation.

FIG. 4F depicts another exemplary rendered perspective view of the stroller of FIG. 4E.

FIG. 5A depicts an exemplary rendered partial top view of the rear portion of an exemplary stroller in an extended position according to the present disclosure.

FIG. 5B depicts an exemplary rendered top view of the stroller of FIG. 5A.

FIG. 6A depicts an exemplary rendered partial top view of the rear portion of an exemplary stroller in transition to/from an extended position from a non-extended position. FIG. 6B depicts an exemplary rendered side view of the stroller of FIG. 6A.

FIG. 6C depicts an exemplary rendered side view of the stroller of FIG. 6A, with one wheel removed for clarity.

FIG. 7A depicts an exemplary underplan view of the rear wheel assembly of an embodiment of the stroller with the rear wheel assembly according to the present disclosure in an extended position.

FIG. 7B depicts an exemplary top perspective view of a portion of the rear wheel assembly in an extended position showing the position of the brake lever.

FIG. 7C depicts a top perspective view of a portion of the rear wheel assembly of an exemplary stroller in a non-extended position.

FIG. 8A depicts an exemplary perspective view of an exemplary rear frame of a stroller in a nonextended position in which a left hand wheel and most of the rear wheel assembly has been removed.

FIG. 8B depicts a cross sectional view of the wheel assembly in an unextended state with an embodiment of an exemplary suspension assembly.

FIG. 8C depicts a cross sectional view of the wheel assembly in an unextended state showing the active load bearing spring according to the embodiment of an exemplary suspension assembly of FIG. 8B.

FIG. 8D depicts a partial cross sectional view of the wheel assembly in an extended state with a first embodiment of an exemplary suspension assembly in which the housing of the rear wheel assembly has been removed for clarity.

FIG. 8E depicts a partial cross sectional view of the wheel assembly in an extended state showing the active load bearing spring according to the embodiment of an exemplary suspension assembly of FIG. 8D.

FIG. 9A depicts an exemplary rendered perspective view of an embodiment of a stroller according to the present disclosure, in which a basket is attached to the rear wheel assembly in an extended position.

FIG. 9B depicts an exemplary rendered side view of the stroller of FIG. 9A. FIG 9C depicts an exemplary side view of the stroller in which a child is standing between the handle and the seat and on the rear wheel assembly in an extended position.

FIG. 10A depicts an exemplary perspective view of a further example of a stroller in a retracted configuration.

FIG. 10B depicts an exemplary perspective view of the stroller of Fig 10A in an extended state.

FIG. 10C depicts the stroller of Fig 10B in an extended state with an additional seat on the rear wheel assembly.

FIG. 11 A depicts a partial exploded perspective view of the rear frame and the rear wheel deck in a retracted state.

FIG. 11 B depicts a partial exploded perspective view of the major components in an extended state.

FIG. 12A depicts a right perspective view of the frame member and rear wheel assembly in a retracted state.

FIG. 12B depicts a right perspective view of the frame member and rear wheel assembly in an extended state.

FIG. 12C depicts a perspective view of the suspension mechanism and brake mechanism of FIG. 12A and one frame member, when the wheel assembly is in an extended state.

FIG. 12D depicts a right perspective view of the brake assembly and suspension assembly of the wheel assembly depicted in FIG. 12A.

FIG. 12E depicts a right perspective view of the brake assembly and suspension assembly of FIG. 12B in the extended state.

FIG. 13A depicts a cross-sectional view of the suspension assembly of the rear wheel assembly in an unloaded and retracted state.

FIG. 13B depicts the same assembly of Fig 13A in a loaded and retracted state.

FIG. 13C is a rear sectional view of the major components of the wheel assembly of FIGS. 13A and 13B unloaded and in a retracted state. FIG. 13D is an enlarged rear sectional view of the portion circled in Fig 13C, showing the nesting arrangement of the tabs of the rear frame within the recesses of the rear wheel assembly; and the suspension assembly nested within the tabs of the rear frame.

FIG. 13E depicts an exemplary left perspective view of the suspension assembly rear frame member and wheel axle in the retracted state when unloaded.

FIG. 13F depicts a further perspective view of the suspension assembly rear frame member and wheel axle in the retracted state when loaded.

FIG. 14A depicts a sectional view of the suspension assembly of the rear wheel assembly in an unloaded and extended state.

FIG. 14B depicts a similar cross section of the suspension assembly of the rear wheel assembly in a loaded and extended state.

FIG. 14C depicts a rear perspective sectional view of the suspension assembly taken through the wheel axle in an unloaded extended state.

FIG. 14D depicts a right perspective view of the major components of the suspension assembly in an unloaded extended state with the wheel removed for clarity.

FIG. 14E depicts a perspective view of the major components of the rear wheel assembly in an extended state when loaded with the wheel removed for clarity.

FIG. 15A depicts a partial rear perspective view of the main components where the brake has not been engaged.

FIG. 15B depicts the same partial view as FIG. 15A in which the brake lever has been actuated downwards.

FIG. 15C depicts a view of the components of the same components as depicted in FIG. 15A in an extended state in which the brake lever has not been actuated.

FIG. 16A depicts the right hand side brake mechanism from the rear of the assembly, showing the brake pin disengaged from the hub.

FIG. 16B depicts the right hand side brake mechanism of FIG. 16A with the brake pin engaged with the hub.

FIG. 16C depicts a cross-sectional view of the interior of the brake paddle. FIG. 17A depicts a rear view of the rear wheel assembly where the latching assembly is in a latched state.

FIG. 17B depicts a rear view of the latching assembly as depicted in FIG. 17A in which the latching assembly is in a disengaged state.

FIG. 17C depicts a rear view of the rear wheel assembly in an extended state in which the latching assembly is engaged.

FIG. 17D depicts a partial view of the rear wheel assembly in which the latching assembly is engaged and in which other components have been removed for clarity.

FIG. 18A depicts an exemplary left perspective sectional view of one rear stroller arm and a portion of the rear wheel assembly in which the suspension and brake assemblies have been removed, and in which the latching mechanism is engaged and the assembly is in an extended state.

FIG. 18B depicts an exemplary right perspective view one rear stroller arm and a portion of the rear wheel assembly in which the suspension and brake assemblies have been removed, and in which the latching mechanism is engaged and the assembly is in a retracted state.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Various embodiments of the disclosure are discussed in detail below. While specific implementations are discussed, it should be understood that this is done for illustration purposes only. A person skilled in the relevant art will recognize that other components and configurations may be used without parting from the spirit and scope of the disclosure.

The disclosed technology addresses the need in the art for a stroller which is able to seat one occupant or two occupants in an extended configuration.

Advantageously, the operational mode of the stroller of the present disclosure can be changed relatively quickly without needing tools between a single occupant carrying configuration and a two occupant carrying configuration, the latter configuration having an extended wheel base. This extended wheel base allows for increased space between the seat(s) and/or carrycot(s) in which the occupants are carried.

Referring now to FIGS. 1A to 1G, and FIGS. 2A to 2C in more detail, it can be seen that the Figures depict a stroller 10 having a seat 12 in a seat frame 14. A handle 16 is able to be gripped by a parent or caregiver to propel the stroller 10. There is shown an exemplary stroller 10 with a single occupant seat 12 in forward or world facing orientation in FIGS. 1A to 1G; and it can be seen that the rear wheel assembly 40 on which the wheels 50 are mounted is in a standard or non-extended configuration. The same stroller 10 is also depicted with the seat 12 oriented in a rearward or parent facing orientation in FIGS. 2A to 2C. Similarly, the rear wheel assembly 40 on which the rear wheels 50 are mounted is in a standard or non-extended configuration. The position of the rear wheels in FIGS. 1 A to 1G and 2A to 2C may be compared to the stroller 10 depicted in FIGS. 3A to 3F, in which the latter rear wheels are located an increased distance from the front wheels.

In the Figures of the present disclosure, it would be appreciated that the stroller may have the various accessories /soft accessories removed for clarity including the seat, seat covers, handle covers, basket etc.

As depicted in FIGS. 1A to 1G and FIGS. 2A to 2C, the front lower frame 20 is pivotally attached at a hub 22 to the rear frame 30. The rear frame 30 comprises a first frame arm member 32 extending downwardly from the hub 22 and a second frame arm member 34 similarly extending downwardly from the hub 22 on the other side.

The rear frame section 30 is pivotally connected with the rear wheel assembly 40 on which rear wheels 50 are attached. Those skilled in the art will would appreciate that although a pair of wheels 50 are depicted, multiple wheels side-by-side or with different dimensions could also be utilized, without departing from the scope of the present disclosure.

The front frame 20 and rear frame 30 in the stroller are connected at the bottom of the frame by a hinge 24 comprising a first inner portion 26a and a second inner portion 26b. Alternative arrangements for this connection between the front frame 20 and rear frame 30 would also be possible without departing from the scope of the present disclosure.

There is also depicted a brake mechanism 60 which includes a brake paddle 62 which has a first arm 64 and second arm 66 on either side of a central housing.

As would be appreciated by persons skilled in the art, the brake mechanism may comprise a brake pin which is moved into and out of engagement with apertures formed in the proximal wheel hub, depending on actuation of either arm 64, 66 of the brake paddle 62 by the foot of the user (not shown).

A similarly configured brake pin can also be moved into and out of engagement with apertures in the distal wheel hub, with the actuation of the brake paddle 62 by the foot of the user near to the proximal wheel hub transferred by a cable arrangement or similar. The brake paddle 62 is configured so that it the first arm 64 is operable in the standard position shown in the various FIGS. 1A to 1 G and FIGS. 2A to 2C, 7C and the other arm (second arm 66) is operable in an inverted position in the extended configuration as depicted in FIGS. 3A to 3F, FIGS. 4A to 4F, FIGS. 7A, 7B and FIGS. 8A to 8C herein.

The brake paddle 62 is arranged for actuation by caregivers’ foot urging a brake pin into or out of engagement with corresponding apertures formed in the circumference of the hub of the wheel 50. However, it would also be appreciated that a variety of other brake arrangements could be used without departing from the scope of the present disclosure in which the brake paddle depicted is an optional element.

In the normal or standard configuration depicted, it can be seen that the rear wheel axle 52 of each rear wheel 50 are engaged with the rear wheel assembly 40. Advantageously, the housing of the rear wheel assembly 40 is attached by a pivotal connection at the point marked A in the FIGS. 1 F and 2B, in this case pivoted so as to extend and substantially surround tab portions 33, 35 of the first and second frame arm members 32 and 34 which are received in recesses 41a, 41 b. If suspension is also included the wheel assembly may also be engaged with the first tab portion 33 and second tab portion 35 of the arm members 32, 34 as described with reference to FIGS. 8A - 8E.

In this position the U-shaped (or similar) recesses 41a, 41 b of the rear wheel assembly 40 are urged by the downward acting force created by the mass of the occupant against the arm members such that the rear wheel assembly 40 is urged closed. That is, the force acts to force the rear wheel assembly against the rear frame 30; and advantageously it is unnecessary to have any further engagement during operation in the standard unextended configuration. Accordingly, it would be appreciated that the latch 54 therefore serves only to retain the assembly in the event that the stroller is picked up from the ground and the wheels (and in turn the assembly) are no longer urged against the frame by the reaction force of the ground.

As depicted the rear wheel axles 52 are located a certain distance away from the front wheels. The rear wheel axle 52 is located forward of the pivotal connection marked “A” between the rear wheel assembly 40 and the rear frame 30. In this configuration, the wheel base (distance between the axle of the front ground engaging wheels and the rear ground engaging wheels) is decreased relative to the arrangement depicted in FIGS. 3A to 3F.

Reference is now made to FIGS. 3A to 3F in which the stroller depicted in FIGS. 1 A to 1G is shown with the rear wheel assembly 40 in the extended configuration. In this configuration, the rear wheel assembly 40 attached to the rear frame 30 has been rotated under and extends out from the tab portions of the first and second frame arm members 32, 34 so that the wheel base (distance between the wheel axle of the rear wheels and the axle of the front wheels) is extended.

In this extended configuration, it can be seen that the upper surface 42 of the rear wheel assembly 40 spans substantially across the stroller between the wheels 50 in the extended configuration.

This surface 42 includes features to provide enhanced grip on the supporting surface for the feet of a standing small child. In this arrangement, the handle 16 may also be telescopically extended upward to allow the child to stand within the space between the handle 16 and the seat frame 14.

Alternatively, as is discussed further in the specification, further seats, baskets, or other accessories such as carrycots could also be mounted to the rear wheel assembly 40 when it is in an extended configuration. These accessories can advantageously engage as appropriate with voids 55 formed therein on the upper surface in the extended configuration.

In FIGS. 3A to 3F the main integers of the stroller remain the same as those depicted in FIGS. 1 A to 2C, although further specific reference is made to aspects of note.

In the extended configuration depicted, it can be seen that the rear wheel axle 52 of each rear wheel 50 are engaged with the rear wheel assembly 40. Advantageously, the housing of the rear wheel assembly 40 is attached by a pivotal connection at the point marked as “A” in the Figures, in this case pivoted so as to extend backwards from the tab portions of the arm members 32 and 34 marked as “A” in the Figures.

As depicted, the rear wheel axles 52 are located at an increased distance from the front wheels as compared to the configuration depicted in FIGS. 1 A to 2C. That is, the rear wheel axle 52 is located rearwardly of the pivotal connection marked as “A” between the rear wheel assembly 40 and the rear frame 30, hence the wheel base (distance between the axle of the front ground engaging wheels and the rear ground engaging wheels) has been increased.

This increase in distance of wheel base corresponds to twice the distance between the pivotal connection of the rear wheel assembly with the rear frame marked as “A” and the attachment point of the axle 52 with the rear ground engaging wheel 50.

It would also be appreciated that the brake paddle 62 is essentially inverted in orientation relative to the orientation of the brake pedal shown in FIGS. 1 A to 1G and FIGS. 2A to 2C. It could be seen with particular reference to FIGS. 3A to 3F, that the recess 41a, 42b are now hidden under the rear wheel assembly 40.

It would also be appreciated that the latch 54 is now located inwardly of the rear wheel assembly 40, with the whole rear wheel assembly 40 having rotated under and about the pivotal connection with the rear frame arm members.

As depicted, in FIGS. 3A to 3F particularly, voids 55 for receiving corresponding accessories in the housing of the rear wheel assembly are visible.

Referring now to FIGS. 4A to 4F, a variety of configurations of accessories in the extended configuration of the stroller are depicted.

FIGS. 4A and 4B depict a combination of the seats in both parent facing and forward facing configurations.

The stroller 80 shown has the rear seat 82 supported on the rear wheel assembly 40. The posts 84 extend from the hub of the rear seat 82 and are supported or retained within the voids 55 formed in the housing of the rear wheel assembly 40. The posts 84 are preferably short plastic/metal rods.

Importantly, this arrangement shifts the centre of mass of the second seat (second occupant) more towards the back of the stroller and proximal to the rear wheel.

Referring to FIGS. 4C and 4D, another exemplary configuration is depicted. In this arrangement, the stroller 90 has two seats, in which the second rear seat 92 and the front seat 12 are both oriented in a world facing configuration.

As with the arrangement depicted in FIGS. 4A and 4B, the rear seat 92 is supported by posts 94 with these posts being received in the voids 55 of the rear wheel assembly 40.

Referring further to FIG. 4E, yet another configuration of the second seat on the stroller is depicted.

In this arrangement, the stroller 100 includes a second seat 102. The front seat 12 is arranged in a world facing configuration while the second seat 102 is arranged in a parent facing configuration. Again, the second seat 102 is supported by posts 104 received in voids formed in the housing of the rear wheel assembly 40. Again, the extended wheel base due to the relative position of the rear wheel assembly allows for the centre of mass of the occupant of the rear seated to be located further away from and closer to the axle of the rear wheel 50.

As depicted in FIGS. 5A and 5B, the rear wheel assembly 40 in an extended position is able to allow a toddler or infant to stand in the gap between the seat 10 and the handle 16. In this arrangement, the voids 55 of the rear wheel assembly 40 do not have any function.

The brake paddle 62 can be seen in a position in which it can be actuated by the foot of the parent or caregiver pushing the stroller.

Referring now to FIGS. 6A to 6C, it can be seen that the stroller is in a transitional position between the extended configuration depicted in FIG. 5A and the extended configuration depicted in FIGS. 1A to 1 G, and FIGS. 2A to 2C.

In particular, a comparison can be made between the exemplary rendered partial top view of FIG. 5A in an extended position, and the transitional position depicted in FIG. 6A.

It can be seen that the rear assembly in FIGS. 6A to 6C is in the process of pivoting about the pivotal connection “A” such that it can either move in the direction marked as “B” to the shorter configuration. Alternatively, if the rear assembly is moved in the direction marked as “C”, it moves to an extended configuration.

As depicted, the shape of the recess 41a, 41 b such that they are sized and dimensioned to substantially receive the corresponding tab positions 32, 35 of the rear frame arm members 32, 34.

If the rear assembly is moved in a direction marked as “B” to the shorter configuration, the recesses substantially extend about the tab portions 33, 35 of the first and second rear arm members 32, 34.

Alternatively, if the rear wheel assembly is pivoted in the direction marked as “C”, the recesses are contained on the underside of the rear wheel assembly 40 and in this extended configuration, the recess is served no function.

Referring now to extended configuration of the rear assembly depicted in FIGS. 7A-7B, the brake mechanism 60 is actuated by a brake paddle 62 specifically by foot of the user depressing and releasing the second arm 66. Conversely, as depicted in FIG. 7C in the standard configuration of the rear assembly depicted the brake mechanism 60 is actuated by the brake paddle 62, specifically by foot of the user depressing and releasing the first arm 64.

In this way, the same overall brake mechanism may be used in either configuration, albeit actuated by different arms 64, 66 of the paddle 62.

Referring now to FIGS. 8A to 8E, there is described an embodiment of an exemplary suspension arrangements which may be included.

As depicted, the rear wheel assembly 40 has the wheels 50 attached thereto. As described herein, the rear assembly pivots about the point marked “A” in the figures. A locking pin 36 extends from the rear wheel assembly (mostly removed for clarity) into a first arcuate slot 38 formed on the tab portion 33. A second arcuate slot 39 is also formed in the tab portion 35 of the first rear arm member 32.

As the rear assembly 40 is rotated from the normal or unextended position depicted, it moves under the frame, and the locking pin 36 is urged out of engagement with the first arcuate slot 38 into engagement with the second arcuate slot 39 when the rear assembly reaches the extended position.

Accordingly, the rear assembly 40 can move responsive to bumpy ground contacting respective wheel 50, albeit constrained by the pin in the respective arcuate slot and the attachment at the pivot point marked “A” in both the extended and unextended or standard positions. The brake mechanism 60 is also included for reference.

A further constraint on movement, and cushioning of this movement may also be provided by the inclusion of suspension springs 44, 46 in the tab portions of the rear frame.

These springs are depicted in hidden outline in the exemplary cross sectional view of a portion of the rear assembly 40 attached to the rear frame as shown in FIGS. 8B and 8C respectively in the normal or unextended configuration. It would be appreciated that the relative stiffness of these springs could be selected according to the amount of resistance required in the respective configuration. These springs are retained in the tab 35 (and corresponding tab 33) of the rear frame. As depicted in FIG. 8B, it can be seen that the locking pin 36 is retained in the first arcuate slot 38 of the tab member 35 of the rear frame 34; which therefore provides a somewhat constrained freedom of movement against the resistance of springs 44, 46. In the standard configuration shown in FIG. 8C it can be seen that the load bearing spring is the lower spring 44, which is compressed against the web of the U shaped recess 41b on the bottom end of spring 44, and retained in the tab 35 at the upper end of the spring 44 in the orientation depicted in the Figure.

Similarly, as depicted in FIG. 8D, when the rear assembly 40 is in the extended configuration, the locking pin 36 is retained in the second arcuate slot 35. Both springs 44 and 46 are depicted in FIG. 8D, although, as shown in FIG. 8E the load bearing spring is of the exemplary suspension depicted is spring 46 shown. This spring 46 is compressed against the web of the inverted U shaped recess 41 b at the top end of spring 46; and retained in tab 35 at the lower end of the spring 46 in the orientation depicted in the Figure. As there is more load on the spring in this configuration it would be appreciated that a stiffer spring than spring 44 could be selected by a person skilled in the art.

Referring now to FIG. 9A, it can be seen that an optional basket member 110 may be included and supported on rod members 112 which are received in the voids 55 defined in the rear wheel assembly 40.

Advantageously, the rear wheel assembly of the present disclosure enables the stroller to have an extended wheel base.

The extended wheel base allows for a multitude of configurations, some of which are depicted in FIGS. 4A to 4F or to include accessories as depicted in FIGS. 9A and 9B.

Advantageously, when the rear wheel assembly is in an extended configuration it allows the user to engage accessories with the voids 55 in the upper surface in this position. These accessories may include various arrangements of seats (as depicted in FIGS. 4A-4F), or a shopping basket (e.g. as depicted in FIGS. 7A-7B).

Alternatively, as depicted in FIG. 9C, the upper surface of the wheel assembly is a surface which may be used a support for a small child 116 riding along on the stroller - for example a toddler that may be tired from walking while their baby sibling is supported in a carrycot on the front of the stroller. However, it would be appreciated that these accessories may only be acquired as needed, or added to the stroller when specific excursions are being planned.

With reference to FIGS. 10A to 10C, there is depicted a stroller 200 having a seat 212 supported in a seat frame 214 in a world facing configuration. A handle 216 enables the care giver to propel the stroller and control the steering of the stroller 200. A front frame 220 and rear frame 230 terminate in ground engaging wheels. The rear wheel on the right hand side is denoted as rear wheel 250. A brake mechanism 260 located under the rear wheel assembly 240 enables the operator of the stroller 200 to actuate a brake mechanism 260 to prevent the stroller from moving, especially on a sloping surface, once engaged.

In the configuration depicted in FIG. 10A, the rear wheel assembly 240 is shown in a retracted state. As depicted in FIG. 10B, the rear wheel assembly 240 is shown in an extended state in which the voids 255 in the rear wheel assembly are able to receive a second seat or shopping basket or the like.

As depicted in FIG. 10B, it would be apparent that the brake mechanism 260 is now rotated relative to the orientation it was in in Fig 10A. The upper surface 243 of the rear wheel assembly 240 is depicted with exemplary gripping portions for the toddler or similar who may be standing on the rear wheel assembly 240.

An exemplary configuration is depicted in FIG. 10C when a second seat 218 is supported in a second seat frame 219, received in the voids 255 which are located on the rear wheel assembly 240.

Referring now to FIGS. 11 A and 11 B, there is depicted in a partial exploded perspective view of the right rear wheel frame and right rear wheel assembly in retracted and extended states respectively. Corresponding left assemblies have been removed for clarity purposes.

As depicted, the rear frame 230 has a rear frame first arm 232 to which a first arm housing 237a with a bump 237 is attached. The first arm housing bump 237b is dimensioned and shaped to overlie the suspension assembly 280 to which an adjacent brake mechanism 260 is attached.

A common pivot axis marked for all of the components with the letter “A” is the pivot axis about which the rear wheel assembly 240 moves between a retracted state and an extended state. The relative movement and special orientation of the respective components is described further herein.

There is depicted a rear wheel 250 which includes a hub 251 and rotates about an axle 252. It would be appreciated that similar wheel, axle and hubs would be used on the opposite side (left hand side) of the rear wheel assembly when viewing the assembly from the rear. Similarly, the front ground engaging wheels may also comprise a wheel, rotating about a hub supported on an axle (not shown). The suspension assembly 280 as depicted, has a first biasing means or spring 282 which is supported by a spring cap 283a on a bore 283b on a suspension housing 286. A second spring or biasing means 284 is retained inside and underneath the suspension housing 286. The operation of the biasing means or springs of the suspension assembly will be detailed further herein.

As can be seen especially in FIG. 11 A, the recesses 241a, 241 b of the rear wheel assembly 240 are configured to receive the suspension assembly 280 and the tabs of the rear frame member 233 therein. The brake mechanism 260 is received under the rear wheel assembly 240 in an elevated portion of the housing 257 in the retracted state as depicted in FIG. 11 A. It would be appreciated that when the rear wheel assembly 240 rotates about the pivot axis marked with “A”, the elevated portion of the rear wheel assembly 240 is then underneath the brake mechanism 260. The brake mechanism 260 may be actuated by a brake paddle 262 comprising a first brake arm 264 and a second brake arm 266 attached to a body. It would be appreciated that the brake mechanism 260 also must rotate with the rear wheel assembly from the retracted configuration depicted in FIG. 11 A through to the extended configuration depicted in FIG. 11 B.

Referring specifically to the extended configuration depicted in FIG. 11 B, it can be seen that the suspension assembly is inverted relative to the orientation depicted in FIG. 11 A. Also inverted relative to FIG. 11 A is the brake mechanism 260.

The brake mechanism 260 partially extends through the large hole 257 formed in the wall of the rear wheel assembly recess 241a. The brake mechanism 260 extends through this hole 257 so the brake pin 268 can move into and out of engagement with the hub 251 of the relevant wheel.

The voids 255 are configured to receive an additional seat or basket as is described further. It would be appreciated that the first surface 242 of the rear wheel assembly 240 is depicted uppermost in FIG. 11 A. As the assembly 240 rotates around the pivot point A, the first surface 242 becomes the lower surface of the rear wheel assembly 240 of the extended state depicted in FIG. 11 B.

The arcuate slot 247 receives the brake pin 268; while the other slot 245 receives the axle 252 of the rear wheel as will be discussed further below.

Advantageously, as the axle of the wheel 252 extends through the suspension assembly 280 and brake mechanism 260, the translation of both of these about the pivot axis marked “A” lengthens the wheel base or dimension between the rear wheel axles and the front axle(s) of the front ground engaging wheels. As has been discussed with reference to the embodiment depicted in FIGS. 1 to 8, the extended configuration provides a greater stability of operation, albeit with some compromise to manoeuvrability. This extension is equivalent to twice the distance between the wheel axle and the pivot axis of the assembly, which advantageously is 60mm (therefore 120mm extensions) although other lengths may be used without departing from the present disclosure.

Referring to FIG. 12A, there is depicted a right perspective view of the rear frame first arm member 232 and a portion of the rear wheel assembly 240.

The tab portion 233 (first portion 233a, second portion 233b) define a space in which the rear wheel assembly first recess 241a is received. The suspension assembly 280 as depicted in FIGS. 11 A and 11 B is located in this first recess 241a. The pivot axis marked “A” about which the rear wheel assembly 240 rotates in the direction marked by the arrow is also visible.

Referring now to FIG. 12B, there is depicted a similar view of the frame member of the rear frame 230 and a portion of the rear wheel assembly in an extended state in which the rear wheel has been removed for clarity. It can be seen that the upper surface of the rear wheel assembly 240 is the surface 243 under the first surface 242 of the wheel assembly 240 in the retracted state depicted in FIG. 12A. In this configuration, the pivot axis of the recess 241a of the rear wheel assembly is marked “A”. The bump portion 237b of the first arm housing 237a is visible from this view, extending from the rear frame first arm 232 of the rear frame 230.

Also visible is a void 255 in which the seat post for a second seat or shopping basket may be received. In this state, the brake mechanism 260 is visible adjacent the recesses 241a of the rear wheel assembly 240. The axle of the wheel 252 is movable within a sleeve 288 and aperture or slot 245 formed in the housing of the rear wheel assembly which defines the recess 241a. Also visible is an arcuate slot 247 in which the brake pin 268 is received.

Referring to FIG. 12C, there is depicted the rear frame and suspension assembly 280 and brake mechanism, in which the rear wheel assembly 240 has been removed for clarity purposes. It would be appreciated that in this configuration, the rear wheel assembly would be in the extended configuration, with the wheel axis 252 located rearwardly of the pivot point marked “A”.

It should be appreciated with reference to FIG. 12C and FIG. 12D that the suspension assembly 280 and brake assembly 260 rotate together as the rear wheel assembly move between the retracted and the extended states. That is, generally there is no independent rotation or change in orientation of most of the components of these assemblies relative to each other, such that the components of these assemblies maintain the same position relative to each other in either state. A qualification to this is the first biasing means 282 and spring cap 283a, which are received in bore 283b on the suspension housing in the retracted state.

The first biasing means 282 and the bore cap 283a are retained in the space defined between the tab portions 233a, 233b of the housing extending from the rear frame first arm 232 when in the extended state. In this state they are not operational.

When the rear wheel assembly moves back to the retracted state from the extended state the first biasing means 282 and bore cap 283a seat in the bore 283b on the suspension housing to provide suspension.

Referring to FIG. 12D, there is depicted the brake mechanism 260 which is adjacent the suspension assembly in the configuration it would be in the retracted state of the rear wheel assembly. The first brake arm 264 and second brake arm 266 (can be seen on the brake assembly, as well as the brake pin 268 which projects through the suspension assembly 280.

The suspension assembly 280 comprises a generally u-shaped housing 286, with the bore 283b receiving the spring cap 283a which is attached to the first spring or biasing means 282. On the underneath of the housing 286, the second spring or biasing means 284 is attached. Screws or fastening means 289 keep the suspension assembly together and engaged with the brake mechanism 260. The sleeve 288 for receiving the axle of the rear wheel (not shown) can also be seen, as well as the pivot axis “A” about which the suspension assembly 280 and attached brake mechanism 260 rotate as they move between the retracted and extended states.

Referring now to FIG. 13A, there is depicted a cross-sectional view of the suspension assembly of the rear wheel assembly in an unloaded and retracted state. Similarly, FIG. 13B depicts the suspension assembly in a retracted state but under load condition such as may be experienced during operation of the suspension going over a bump. Advantageously, the gripping portions are only exposed on the upper surface of the rear wheel assembly 240 in an extended state.

Referring to both FIGS. 13A and 13B, the rear frame 230 and rear frame first arm 232 are visible.

The bump 237b in the first arm housing 237a in the tab portion of the first arm 233a can also be seen. The suspension assembly 280 has a first biasing means or spring 282 with a cap 283a. The first biasing means or spring 282 and cap 283a are received in a bore 283b located on the suspension housing 286. A second biasing means or spring 284 as depicted is inactive in the retracted configuration in FIG 13A.

As depicted the axis of the first biasing means 282 and second biasing means 284 are axially aligned, however, it should be appreciated that it is not necessary that the axes are so aligned.

The pivot axis about which the suspension assembly 280, brake mechanism 260 and rear wheel assembly 240 rotate is marked “A”. The sleeve 288 in the suspension assembly is aligned with a corresponding aperture (not shown) of the tab portion of the first arm 233a to receive the axle of the rear wheel (not shown) which is inserted therethrough. Also depicted is an aperture in the rear wheel assembly housing 245 through which the wheel axle 252 extends.

A portion of the slot 247 for receiving the locking pin in the rear wheel assembly is also visible. The voids which are not usable in the retracted configuration 255. The arrow indicates the direction to change the rear wheel assembly from the retracted configuration to the extended configuration.

Referring now specifically to FIG. 13B, it can be seen that the similar elements are present as depicted in Fig 13A. However, it can be seen in this Figure that the movement of the rear leg downwardly under load causes the first spring or biasing means 282 to compress and the cap 283a to move out of the bore 283b on the suspension assembly housing 286.

It would be appreciated that during the operation of the suspension under load, the rest of the suspension assembly is essentially static. This means that the suspension resists downward movement of the frame relative to the rear wheel assembly - through compression of the first biasing means or spring 282. Once again, in FIG. 13B the arrow indicates the direction in which the rear wheel assembly moves about the pivot axis A to the extended configuration.

Referring now to FIG. 13C, there is depicted a rear sectional view of the major components of the rear wheel assembly of FIG. 13A in a retracted and unloaded state. This sectional view is taken through the pivot axis marked “A” in the previous figures. The frame 230 and rear frame first arm 232 can be seen. The axle 252 of the rear wheel 250 extends through the rear wheel assembly 250, tab portion of the first arm 233a, suspension assembly 280, tab of the first arm 233b and brake mechanism 260.

The recess 241a of the rear wheel assembly 240 receives the tabs 233a and 233b of the rear frame first arm 232. The suspension assembly 280 is received in the space defined between these tabs as shown in more detail in FIG. 13D. The brake mechanism 260 is received under the rear wheel assembly adjacent to the tab 233b of the rear frame first arm but operating on the hub 251 of the rear wheel. The latch 254 for retaining the rear wheel assembly is also visible.

Referring now to FIG. 13D, there is depicted an enlarged rear sectional view of the circled portion of FIG. 13C. In this Figure, the recess 241a of rear wheel assembly is defined by wall members 241c, 241 d and receives the tabs 233a and 233b of the first arm of the rear frame therein. The suspension assembly housing 286 is also visible.

As depicted, the recess of the rear wheel assembly 241a, the tabs 233a and tabs 233b of the rear frame member and the housing 286 of the suspension assembly 280 are shown in cross section as three essentially “U-shaped” arrangements. It would be appreciated that these U shapes are depicted in one state and orientation with respect to each other; but other orientations may also be possible. It should be noted that the suspension assembly 280 and the recess 241a remain in the same orientation with respect to each other as they rotate about the pivot axis “A”. However the relative position of these components with respect to the tabs 233a, 233b of the rear frame first arm changes as they rotate about the pivot axis “A” between a retracted state and the extended state.

Referring now to FIG. 13E, there is depicted a perspective view of the main components of the rear wheel assembly depicted in FIG. 13A in a retracted state without load. A corresponding view in FIG. 13F is depicted of the same components in the retracted state but under load, and as such this figure is an external view of the components depicted in FIG. 13B.

As depicted in both FIG. 13E and 13F, the rear frame 230 and rear frame first arm portion, are received within the recess 241a of the rear wheel assembly 240. As depicted, the first surface 242 of the rear wheel assembly 240 is visible. A first brake arm 264 of the brake mechanism 260 is visible. The suspension assembly 280 is received between the tab portions of the first arm 233a to 233b. The pivot point A about which the rear view assembly and suspension assembly and brake mechanism pivot is marked with an “A”. The wheel axle 252 is received in an aperture 245 and the aperture or slot for the brake pin 247 in this configuration is also visible. The arrow indicates the direction the rear wheel assembly rotates to move from the retracted configuration shown. The main difference between the states in FIGS. 13E and 13F is that 13F depicts a load being applied which compresses the first spring 282 and spring cap 283a against the bore 283b on the suspension housing 286 (not shown).

It should be noted that the axle remains at the top of the slot 245 as this slot is only operable in the extended state. Only the rear frame first arm 232 has moved downward under the application of load.

Referring to FIGS. 14A and 14B, there is depicted a sectional view of the main components of the rear wheel assembly in an extended state without load and extended state with load respectively. As is depicted, the rear frame 230 and rear frame first portion 232 terminate with a housing 237a. The first biasing means or spring 282 and cap 283 are retained in a housing 237a of the first arm portion.

A vertical face 236 abuts and contacts a complementary vertical face of the rear wheel assembly 240. In the extended state depicted, this joint effectively means that any force or load on the leg frame travels through to the rear wheel assembly 250 and the vertical face of the first arm 236 and the rear wheel assembly effectively act as a single unit. This means force is transferred down onto the second biasing means or spring 284 compressing it against the underside of the suspension assembly 280.

In this extended state, it would be understood that the first spring or biasing means is not operational.

The voids of the rear wheel assembly 255 are visible to receive the post of the seat or basket inserted therein.

The pivot access about which the suspension assembly 280, the brake mechanism 260 and the rear wheel assembly 240 rotate is marked with an “A”. The aperture 288 for receiving the wheel axle in the suspension housing is also visible.

Referring specifically to FIG. 14B, it can be seen that the application of force on the rear frame downwardly compresses the second spring or biasing means 284 which in turn means that the frame appears to move upward as depicted in FIG. 14B.

As depicted, it can be appreciated that the suspension assembly 280 maintains in a generally horizontal orientation with respect of the wheel axle. This means that the rear frame first arm appears to move upward as depicted.

Referring now to FIG. 14C, there is depicted a rear sectional view of the major components of the rear wheel assembly of FIG. 13A in an extended and unloaded state. As depicted, the rear frame 230 and rear frame first arm 232 terminate in the housing 237a in which the suspension assembly 280 is received. The brake mechanism 260 is located adjacent the housing 237a and the recess 241a of the rear wheel assembly 240. The rear ground engaging wheel 250 rotates about the wheel axle 252 together with the hub 251. This cross section is taken through the axis of the wheel/axle.

FIG. 14D depicts a perspective view of the major components of the rear wheel assembly in an extended and unloaded state. It can been seen that the wheel has been removed for clarity purposes although the axle 252 is shown projecting through the aperture 245 in the rear wheel housing in which it is received. The arcuate slot 247 for the brake pin 268 is also visible. The pivot axis is again marked “A”. Also visible is the second surface of the rear wheel housing 243 which is now uppermost in the orientation and the brake mechanism 260 with the second brake arm 266.

Referring to FIG. 14E, there is depicted the rear frame of the rear wheel assembly 240 in an extended state under load. The frame 240 and rear frame first arm 232 are visible as are the first arm housing 237a and first arm housing bump 237b.

As depicted, the vertical face 236 of the housing 237 abuts the corresponding vertical face of the rear wheel assembly housing. As depicted, the second surface 243 of the rear wheel assembly 240 and brake mechanism 260 and second brake arm 266 can be seen.

Under load, the brake pin 268 travels to the top of the arcuate slot 247. Similarly, the axle 252 of the rear wheel is at the top of the aperture in the rear assembly housing 245. The brake pin 268 is in the slot 247 such that it can move into an out of an engagement with the hub 251 of the rear wheel (not shown).

As depicted, the rear wheel assembly is pivoted about the axis marked “A”.

Force acting through the rear frame and/or on the rear wheel assembly compresses the second biasing means or spring 284 which causes the appearance of the arm moving up. Referring now to FIG. 15A, there is depicted a partial rear perspective view of the main components where the brake mechanism 260 has not been engaged in a retracted state. The rear wheel 250, rear wheel assembly 240 and brake assembly 260 are visible. The suspension assembly 280 is also visible. The first brake arm 264 is depressed by the foot of the user to actuate the brake pin into engagement with the hub and travels to the position depicted in FIG. 15B. The pedal returns back to the position shown in FIG. 15A once the foot of the user has been released, with the brake pin being engaged as is described further herein.

Referring now to FIG. 15B, the same components may be seen, with the brake pin engaged in a retracted state, and the first brake arm now relatively lower than the position as it was depicted in FIG. 15A. Referring now to FIG. 15C, there is similarly depicted the rear wheel assembly and the brake mechanism 260 together with the rear wheel 250. In this position, the brake is also not engaged, with the second brake arm 266 able to be actuated by the foot of a user.

Referring now to FIG. 15D, there is depicted the brake mechanism in an engaged state in an extended configuration. As depicted, the second brake arm 266 is relatively lower than the position it was in FIG. 15C. Similarly, once the user’s foot is released, the brake pin remains engaged with the hub and the brake pedal returns to the state depicted in FIG. 15C.

FIG. 16A and FIG 16B depict cross sectional perspective views of the brake mechanism in an unlocked and locked state respectively.

As depicted, the brake pin 268 is housed in an essentially cylindrical brake pin follower 270 and projects from the open end of the follower. The other end of the brake pin follower 270 is closed and has a flat face 271a and a sloping face 271 b which tapers backwards; in a direction of away from the actuator and backwards relative to the axis defined by the actuation of the brake pin 268 which is received in the other end of the brake follower 270.

The flat face 271a and sloping face 271b of the brake pin follower 270 are urged by the spring 274 against the sloping face 276 of the actuator 272 in a sliding contact. Rotation of the brake paddle 262 by the foot of the user drives rotation of the brake actuator 272; and the various sections of the sloping face of the actuator 276 as is detailed further below.

In particular, there are three main actuating regions of the face of the actuator, each comprising essentially four main sections.

As depicted, the first 275a comprises a substantially perpendicular portion 276a relative to the axis of movement of the brake pin 268 (marked by an arrow “B”); and a sloped portion 276b which correspond to an unlocked state of the brake pin; where the brake pin is not engaged with any hole formed in the hub 251 (depicted in dotted outline for reference). As depicted the brake is retracted faces 271a and 271 b rest against 276a and 276b.

In this state, the wheel can freely rotate.

In the second section 275b of the sloping face 276 of the actuator 272, the sloped portion continues in 276c. This sloping face 276c corresponds to the transitional state from an unlocked state to a locked state of the wheel.

As part 272 is rotated when the pedal is pressed (via the pawl), 271 b travels against 276c and hence moves axially forward towards or against the wheel/hub. As the rotation comes to an end 271a bumps over lip 276d and 271a rests against 276e, and enters fully engaged section 275c. The pedal then returns via its own spring but these internal parts remain static during that pedal return.

In this third section 275c of the actuator 272, the brake pin 268 extends in a locked state and is urged out into a corresponding hole formed in the hub 251. This axial movement occurs due to the further substantially flat or perpendicular surface 276d relative to the axis of movement of the brake pin which urges the brake follower and hence the brake pin into engagement with the hub through the wall of the suspension assembly 280.

In the fourth section 275d of the actuator 272, there is part of another inclined surface 276h; although this surface is inclined less steeply relative to inclined surface 276b.

To disengage the brake in section 275d, flat face 271a of the brake follower 270 travels up and over sloped surface 276f which is a sloped surface rather than a flat surface to try to maintain the relationship of the parts relative to each other and limit inadvertent rotation of the actuator 272 by vibrations or similar.

As the pedal continues to rotate 272 via the pawl, flat face 271a of the brake follower 270 then drops over the chamfered face 276h which then allows the full retraction of the brake pin in section 275e.

In section 275e flat face 271a of the brake follower 270 returns to rest against 276m (and corresponding sloping face 271 b ends up resting against 267n).

Referring now to FIG. 16B, there is a depicted the rotation of the actuator 272; driven by actuation of the pedal by the foot of a user. It can be seen that the brake pin follower 270 is in the third section 275c with the inclined surface 2761 urging the brake follower against spring 274 and hence the brake pin 268 into engagement with the hub 251.

Further rotation of the actuator 272 will then drive the follower over the lip 276h and into the first section 275e (which is another version/instance of first section 275a) of the next region (into sections 276m and 276n); this region in turn consisting of the same four main sections detailed above.

Hence rotation of the actuator 272 of the brake mechanism results in linear displacement of the brake pin 268 into and out of engagement with the hub 251 .

FIG. 16C depicts a section through the brake mechanism 260. The first arm 264 and second arm 266 may be actuated by the foot of a user. Actuation of these arms drives rotation of the brake paddle such that the formations 277a, 277b, 277c, 277d, 277e, 227f in the brake paddle 262 successively in turn drive a pawl 273 which projects from the actuator 272 and is biased so as to engage with one of said formations. Rotation of the sliding contact of the pawl 273 which is engaged with the formations hence rotates the actuator 272; and the locking and unlocking behaviour detailed above with reference to FIG. 16A and FIG. 16B. Each of the formations of the brake paddle 262 comprises a sloping face and an engaging face over which the pawl travels as the brake paddle 262 rotates.

It would be appreciated that a cable or similar can transfer the change in state/position of the brake pin 268 to rotate a similar actuator 272 located in the brake mechanism (not shown) of the adjacent wheel.

Advantageously, the cable may be attached to the brake pin follower 270 on the right side of the brake system; and then is configured to rotate an actuator in the left brake mechanism similar to actuator 272 of the right brake system depicted. This arrangement ensures that both left and right brake pins are in the same state; and there is no state where the brake pin of one side is engaged and the brake pin of the other side is disengaged.

FIG. 17A and FIG. 17B depict the transition of the latch mechanism 290 between a locked position (FIG. 17A) and an unlocked position (FIG. 17B).

As depicted in FIGS. 17A- 17C, the rear frame first arm 232 and rear frame second arm 234 terminate in ground engaging wheels 250. The suspension assemblies 280a, 280b are received in recesses 241a, 241b of the rear wheel assembly 240; inside the space defined between the respective tabs of the arms of the rear frames 232, 234. The main (master) brake mechanism 260a is located adjacent the suspension assembly 280a; while the “slave” brake mechanism 260b is adjacent the suspension assembly 280b on the other side.

As depicted in FIG. 17A, the latching sliders 292a , 292b are at rest in an outward position; which means that the latching pin (not visible) to which the latching sliders are connected is engaged with the first arcuate slot 238 (not shown) (It would be appreciated that as depicted, the rear wheel assembly is in a retracted state).

Referring to FIG. 17B, the latching sliders 292a, 292b have been moved inward by the fingers of a user; thereby retracting the locking pin out from engagement with the first arcuate slot 238 (not shown).

This enables the rear wheel assembly to move to the state depicted in FIG. 17C, where the latching pin (not visible) is engaged within the aperture 239 in the extended and latched state. FIG. 17D depicts an exemplary view of the latching assembly and brake pins with other components (including the surfaces of the rear wheel assembly) removed for ease of reference. The rear wheels 250 and hubs 251 are supported on axles 252, with the brake pins 268a, 268b and brake pin followers 270a, 270b engageable with the hubs. The brake cable 269 communicates the actuation of the actuator of the master brake mechanism (not shown) on the right hand side across to actuation of the brake mechanism (not shown) on the left hand side.

It can be seen that the latching sliders 292a, 292b are biased outwardly by latching coil springs 294a, 294b and user actuation to move these together shortens the cable 296a, 296b and hence pulls the latching pins 298a, 298b against the latching cable springs 297a, 297b and out from engagement with the arcuate slots 238, 239 defined in recesses 241a, 241 b of the rear wheel assembly 240 and tab portion 233 of the first arm and tab portion 235 of the second arm.

Referring now to FIG. 18A, there is shown the exemplary left perspective sectional view of one rear stroller arm and a portion of the rear wheel assembly in which the wheel, suspension and brake assemblies have been removed in the extended state. As depicted, the first arm housing 237a, of the rear frame first arm 232 retains the first spring or biasing means and spring cap in the boss 237c depicted. Only the second biasing means or spring is active in the suspension assembly 280 in this state.

The suspension assembly (not shown) and brake assembly (not shown) are rotatable about the pivot point marked A in defined in the tab portion of the first arm 233b.

In this state, the latching pin 298 extends through the hole 239 of the tab portion 233b of the first arm 232.

A void 255 on the rear wheel assembly is positioned so as to receive the second seat/basket; and the hole 257 in the housing for receiving the suspension assembly 280 and attached brake mechanism 260 is also visible. It would be appreciated that hole 257 is sized/shaped so that the brake system 260 and suspension 280 can move to allow the suspension to work when in the extended state.

In FIG 18A, the housing of the rear wheel assembly 240 and the rear leg 232 act together to load the suspension spring (not shown) together. The rear wheel assembly and rear leg are able to act together to load the suspension spring because of the contact between the vertical face 236 of the rear frame first arm 232 with a corresponding vertical face of a portion of the rear wheel assembly 240 and the engagement of the locking pin 298 in the hole 239. Referring to FIG. 18B, the latching pin 298 can be seen retained within the arcuate slot 238, so that the rear wheel assembly 240 does not “drop out’ when the whole stroller is lifted. The arcuate slot and suspension assembly (not shown) enables the rear wheel assembly to move relative to the frame via the suspension assembly when under load as discussed herein.

The same stroller is therefore compact in the standard configuration with the associated handling benefits of a shortened wheel base (distance between the centre of the front and rear wheels).

As needed, the same stroller can then be changed to an extended wheel base version, which offers caregivers the instant flexibility of the extended wheel base, without any requirement to use tools. Accordingly, the rear wheel assembly of the present disclosure provides flexibility and ease of use that is lacking in prior art strollers.

It would be appreciated that having a shorter wheelbase and the rear wheel assembly further away from the feet of the caregiver operating the stroller allows more room for a natural stride length. Depending on the height of the caregiver, this can mean that the caregiver is more likely to potentially only compromise their natural stride when the rear wheel assembly is extended.

Furthermore, it would be appreciated that as described herein, the ability for different springs operable in retracted or extended state allows the suspension to be different (possibly stiffer) when extended when more weight/load is expected on the stroller.

As the rear wheel assembly is able to rotate under/downwards this rear wheel assembly is engaged through both suspension scenarios i.e. in extended and retracted states.

Advantageously, the flat vertical face 236 disclosed herein enables the disclosed rear wheel assembly to be operable without any latches (if necessary). The latches herein described retain the rear wheel assembly in either desired state if the rear wheel is lifted from the ground.

A person skilled in the art would appreciate that in the extended state the actual load is transferred via the vertical face 236 described above.

The arrangement of the present disclosure may be compared to an alternative configuration if the rear wheel assembly were rotated outward and from above the pivot axis. In this alternative configuration any load on the rear wheel assembly in the extended state would tend to urge the board back to the retracted state, and hence the latches in this configuration would need to be a structural part of the system resisting this application of load. As disclosed herein the voids 255 for the rear seat/cot/car seat/accessory attachment are only available when the rear has been extended, which prevents the caregiver operating the stroller to include these attachments in the retracted states. Advantageously, this prevents incorrect configuration which may cause issues due to centre of gravity and handling issues which could also cause safety concerns like tilt test failure etc.

It would be appreciated that the stroller or pushchair described herein is a small stroller with good handling in the retracted state, which can be converted to an extended stroller as and when needed with more stability and ease of operation for the caregiver.

As would also be appreciated, when there is no longer any requirement for the extended wheel base (e.g. where the second child recovers their energy or parts company with the parent or caregiver) the stroller can then be transformed back to the more compact configuration with better handling and the excursion of the parent/caregiver with the other child can continue. Although a variety of examples and other information was used to explain aspects within the scope of the appended claims, no limitation of the claims should be implied based on particular features or arrangements in such examples, as one of ordinary skill would be able to use these examples to derive a wide variety of implementations. Further and although some subject matter may have been described in language specific to examples of structural features and/or method steps, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to these described features or acts. For example, such functionality can be distributed differently or performed in components other than those identified herein. Rather, the described features and steps are disclosed as examples of components of systems and methods within the scope of the appended claims.

There is provided a rear wheel assembly pivotally connected between rear frame members of a stroller and having rear wheels attached thereto; wherein said rear wheel assembly is movable under the rear frame of the stroller between a first load bearing position in which the rear wheels are retained forward of the pivotal connection with the stroller and a second position wherein the rear wheels are rearward of said pivotal connection with the stroller.

Optionally in the first load bearing position the rear wheel assembly is configured to receive the rear frame members in respective recesses defined therein such that each recess is urged against each rear frame member under load.

Preferably in the first load bearing position, the recesses of the rear wheel assembly are channels dimensioned to receive therein a corresponding rear frame member. In the first load bearing position the rear wheel assembly may be releasably retained on said stroller via a latching mechanism.

The rear wheel assembly may include apertures for releasably securing axles of the rear wheels attached thereto.

A void on each side on the upper surface may be included in the second position for receiving corresponding projections therein, preferably for receiving projections of a seat frame or a basket.

Preferably a web spans between the rear frame members having gripping members engageable with the feet of a child thereupon in at least the second position.

Advantageously, the rear wheel assembly further includes a brake paddle actuable in either the first position or the second position to engage and disengage a sliding member from engagement with corresponding apertures defined in hubs of the wheels.

Suspension assemblies may be disposed on either side of said rear wheel assembly, said suspension assemblies comprising at least one biasing means disposed proximal to each pivotal connection of the rear arm and rear wheel assembly.

At least one biasing means of each suspension assembly comprise first and second springs having different spring constants from each other.

Preferably the first spring of the suspension assembly is attached at one end within the rear frame such that when the rear wheel assembly is in the second load bearing position, the first spring is disengaged from the suspension assembly.

Advantageously, the second spring of the suspension assembly is arranged so as to be compressible by the suspension assembly in the second load bearing position.

Preferably the rear wheel assembly has a face configured to bear against a complementary face of the rear frame assembly of the stroller when engagement therewith in the second load bearing position so as to transfer load applied thereto onto the suspension assembly.