Baby stroller

Abstract

The present disclosure relates to a baby stroller including a lower frame. The lower frame includes a front frame section connected to a rear frame section. The rear frame section includes a rear wheel assembly extending between two rear frame members. The rear wheel assembly is pivotally connected to the two rear frame members and has grounded rear wheels attached thereto, and is movable below the rear frame section between a first load bearing position in which the rear wheels remain in front of the pivot connection and a second position in which the rear wheels remain in front of the pivot connection. The rear wheels are rearward of the pivot connection.

Description

Technical Field

[0001] The present invention relates to a baby stroller or a folding baby carriage (pushchair) and a rear wheel assembly thereof, and in particular to a baby stroller or a folding baby carriage capable of transporting one infant or child and / or two or more infants or children. Background Art

[0002] Most strollers or folding baby carriages have one or more front wheel assemblies mounted to a front frame, and two rear wheel assemblies mounted to a rear frame; wherein the front and rear frames are connected at a central hub. In many strollers or folding baby carriages, a single seat or portable crib is mounted near the hub; in some cases, it is interchangeable between a forward "world-facing" configuration or a rearward "parent-facing" orientation.

[0003] Some strollers are designed so that they can support a seat and a carrycot, or two seats in a variety of different configurations, to provide for the relatively common situation where parents keep children close together. In these situations, the second child is often born before the first child is able to walk independently or for long distances. At this time, it is often more convenient for the parent or caregiver to have a single stroller that can support two occupants, rather than having a separate stroller or foldable stroller for each child.

[0004] Various methods have been developed for accommodating two occupants on a single stroller. Some strollers or folding baby carriages have been developed that have two fixed side-by-side seats; while other strollers or folding baby carriages have fixed front and rear seats in a line. However, such strollers tend to be large, cumbersome and difficult to maneuver; and may not be suitable for the time frame when there is only one child in the family.

[0005] Accordingly, there is a need for a stroller or foldable baby carriage that is reconfigurable to handle situations where only one occupant is present, as well as situations where two occupants may be present.

[0006] One way to address this need is to include a separate additional frame with a seat and its own attached wheel set, although this results in a relatively large and heavy stroller.

[0007] In another approach, a stroller or foldable baby carriage may be configured such that a single frame includes two seats / single seat and a carrycot arranged one behind the other on the frame. However, in this arrangement, a common problem is to ensure that the seating arrangements for the occupants are spaced far enough apart from each other so that the occupants are comfortable, but at the same time not making the stroller or foldable baby carriage too large and difficult for the caregiver to maneuver.

[0008] One way to address the spacing issue is to make smaller seats for the occupants.

[0009] Alternatively, some strollers are configured so that a longer wheelbase (the distance between the front axis of rotation of one or more front wheel assemblies and the axis of rotation of the rear wheel assemblies) can be achieved by including a removable rear axle that can be changed between the original distance and a longer distance. However, such an arrangement can be time-consuming and inconvenient, requires disassembly, and can still generally result in a stroller that is bulky and difficult to maneuver.

[0010] Therefore, there is a need to provide a baby stroller or foldable baby stroller that solves or at least partially improves some of the above-mentioned problems and disadvantages of the prior art. Summary of the invention

[0011] The features and advantages of the present disclosure will be set forth in the following description, and in part will be obvious from the description, or may be learned by practicing the principles disclosed herein. The features and advantages of the present disclosure may be realized and obtained by the instruments and combinations particularly pointed out in the appended claims.

[0012] According to a first aspect of the present disclosure, there is provided a baby stroller comprising a lower frame, the lower frame comprising:

[0013] a front frame section connected to a rear frame section, wherein the rear frame section includes a rear wheel assembly extending between two rear frame members;

[0014] wherein the rear wheel assembly is pivotally connected to two rear frame members and has rear wheels attached thereto; the rear wheel assembly is movable below the rear frame section between a first load-bearing position in which the rear wheels are held forward of the pivotal connection and a second position in which the rear wheels are behind the pivotal connection.

[0015] 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.

[0016] In the first stowed position, the recess of the rear wheel assembly may be a channel sized to receive a corresponding rear frame member therein.

[0017] Advantageously, in the first stowed position, the rear wheel assembly is releasably retained in said position by a latch mechanism.

[0018] Preferably, the tab of each rear frame member includes an aperture for receiving a pivot member engageable with the rear wheel assembly for pivotal connection thereof.

[0019] Optionally, the rear wheel assembly may include an aperture for releasably securing an axle of the rear wheel attached thereto.

[0020] The rear wheel assembly may include a void on each side of the upper surface in the second position for receiving a corresponding protrusion therein. The voids may be configured to receive protrusions of a seat frame or basket.

[0021] Advantageously, the rear wheel assembly includes a web spanning between the rear frame members, the web being dimensioned to support a child's foot thereon in at least the second position.

[0022] The rear wheel assembly may be positioned beneath a rod that extends between the rear frame members in the first position.

[0023] The rear wheel assembly may include a brake paddle actuatable in the first position or the second position to engage and disengage sliding members with corresponding apertures defined in the hubs of the wheels.

[0024] Optionally, the rear wheel assembly may include a suspension therein, the suspension comprising biasing means disposed adjacent each pivotal connection between the rear arm and the rear wheel assembly.

[0025] The biasing means may comprise a first spring and a second spring having spring constants which differ from each other.The biasing means may alternatively consist of a single spring having different stiffness regions.

[0026] The rear wheel assembly may include a suspension assembly disposed on either side thereof, the suspension assembly including at least one biasing device disposed adjacent each pivotal connection of the rear arm and the rear wheel assembly.

[0027] The first spring of the suspension assembly is attached at one end within the rear frame such that the first spring is disengaged from the suspension assembly when the rear wheel assembly is in the second load-bearing position.

[0028] Preferably, the second spring of the suspension assembly is arranged to be compressible by the suspension assembly in the second load-bearing position.

[0029] Preferably, the rear wheel assembly has a face arranged to bear against a complementary face on the rear frame assembly in the second load-bearing position so as to transfer loads applied thereto to the suspension assembly.

[0030] In another aspect of the present disclosure, there is provided a rear wheel assembly for a baby stroller, the rear wheel assembly comprising:

[0031] a deck member having two housings configured to receive at least a portion of a rear frame member of a stroller therein, wherein the housings have apertures defined therein for pivotal connection thereto;

[0032] The rear wheel assembly is movable beneath the rear frame members between a first load-bearing position in which the wheel is held forward of the pivotal connection with the frame member and a second position in which the wheel is rearward of the pivotal connection with the frame member.

[0033] In yet another aspect, a 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 is provided:

[0034] Among them, the method includes:

[0035] actuating a latch mechanism to release the rear wheel assembly from the first stowed position in which the 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 a pivotal connection between the rear wheel assembly and the rear frame of the stroller; and

[0036] Raising the stroller causes the rear wheel assembly to pivot downwardly from beneath the two rear frame members to a second load-bearing position in which the wheels of the rear wheel assembly are located behind the pivotal connection between the rear wheel assembly and the rear frame of the stroller. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to describe the method by which the above and other advantages and features of the present disclosure can be obtained, a more particular description of the principles briefly described above will be presented by reference to specific embodiments of the present disclosure shown in the accompanying drawings. It should be understood that these drawings depict only exemplary embodiments of the present disclosure and, therefore, should not be considered to limit the scope of the present disclosure. The principles herein will be described and illustrated with additional specificity and detail through the use of the accompanying drawings.

[0038] The preferred embodiments of the present disclosure will be further explained in detail below by way of examples and with reference to the accompanying drawings, in which:

[0039] Figure 1A An exemplary rendered perspective view of an embodiment of a stroller according to the present disclosure is depicted in a non-extended position with the seat in a world-facing orientation.

[0040] Figure 1B Depicted Figure 1A An exemplary rendered perspective view of a baby stroller with one rear wheel removed for clarity.

[0041] Figure 1C Depicted Figure 1A An exemplary rendered side view of a baby stroller.

[0042] Figure 1D Depicted Figure 1A An exemplary rendered side view of a baby stroller with one wheel removed for clarity.

[0043] Figure 1E Depicted Figure 1A An exemplary rendered top view of a baby stroller.

[0044] Figure 1F Depicted Figure 1A An exemplary rendered perspective partial view of a rear portion of a baby stroller.

[0045] Figure 1G Depicted Figure 1A An exemplary rendered rear view of a baby stroller.

[0046] Figure 2A An exemplary rendered perspective view of an embodiment of a stroller according to the present disclosure is depicted in a non-extended position with the seat in a parent-facing orientation.

[0047] Figure 2B Depicted Figure 2A An exemplary rendered perspective view of a baby stroller with one wheel removed for clarity.

[0048] Figure 2C Depicted Figure 2A An exemplary rendered side view of a baby stroller.

[0049] Figure 3A An exemplary rendered perspective view of an embodiment of a stroller according to the present disclosure is depicted in an extended configuration with the seat in a world-facing orientation.

[0050] Figure 3B Depicted Figure 3A An exemplary rendered perspective view of a baby stroller with one wheel removed for clarity.

[0051] Figure 3C Depicted Figure 3A An exemplary rendered side view of a baby stroller.

[0052] Figure 3D Depicted Figure 3A An exemplary rendered side view of a baby stroller with one wheel removed for clarity.

[0053] Figure 3E Depicted Figure 3AAn exemplary rendered perspective partial view of a rear portion of a baby stroller.

[0054] Figure 3F Depicted Figure 3A 00140 00141 001413 ...

[0055] Figure 4A An exemplary rendered side view of an embodiment of a stroller is depicted with two seats in an extended configuration and one seat in a world-facing orientation and one seat in a parent-facing orientation.

[0056] Figure 4B An exemplary rendered perspective view of an embodiment of a stroller is depicted with two seats in an extended configuration, one seat in a world-facing orientation, and one seat in a parent-facing orientation.

[0057] Figure 4C An exemplary rendered side view of an embodiment of a stroller is depicted with two seats in an extended configuration and two seats in a world-facing orientation.

[0058] Figure 4D An exemplary rendered perspective view of an embodiment of a stroller is depicted with two seats in an extended configuration and two seats in a world-facing orientation.

[0059] Figure 4E Another exemplary rendered side view of an embodiment of a stroller is depicted with two seats in an extended configuration and one seat in a world-facing orientation and one seat in a parent-facing orientation.

[0060] Figure 4F Depicted Figure 4E Another exemplary rendered perspective view of a baby stroller.

[0061] Figure 5A An exemplary rendered partial top view of a rear portion of an exemplary infant stroller in an extended position according to the present disclosure is depicted.

[0062] Figure 5B Depicted Figure 5A An exemplary rendered top view of a baby stroller.

[0063] Fig. 6A Depicted is an example rendered partial top view of a rear portion of an example stroller transitioning from a non-extended position to / from an extended position.

[0064] Figure 6B Depicted Fig. 6A An exemplary rendered side view of a baby stroller.

[0065] Figure 6C Depicted Fig. 6A An exemplary rendered side view of a baby stroller with one wheel removed for clarity.

[0066] Fig. 7A An exemplary bottom view of a rear wheel assembly of an embodiment of a stroller is depicted, wherein the rear wheel assembly according to the present disclosure is in an extended position.

[0067] Figure 7B An exemplary top perspective view of a portion of a rear wheel assembly in an extended position illustrating the location of a brake lever is depicted.

[0068] Figure 7C Depicted is a top perspective view of a portion of a rear wheel assembly of an exemplary stroller in a non-extended position.

[0069] Fig. 8A An exemplary perspective view of an exemplary rear frame of a stroller in a non-extended position is depicted, with the left side wheel and a majority of the rear wheel assembly having been removed.

[0070] Figure 8B A cross-sectional view of a wheel assembly in an unextended state is depicted having an embodiment of an exemplary suspension assembly.

[0071] Figure 8C Depicts a cross-sectional view of a wheel assembly in an unextended state, showing Figure 8B An active load spring of an exemplary suspension assembly embodiment.

[0072] Fig.8D A partial cross-sectional view of a wheel assembly in an extended state having a first embodiment of an exemplary suspension assembly is depicted, wherein the housing of the rear wheel assembly has been removed for clarity.

[0073] Fig. 8E A partial cross-sectional view of a wheel assembly in an extended state is depicted, showing the Fig.8D An active load spring of an exemplary suspension assembly embodiment.

[0074] Fig.9A An exemplary rendered perspective view of an embodiment of a stroller according to the present disclosure is depicted with a basket attached to a rear wheel assembly in an extended position.

[0075] Fig. 9B Depicted Fig.9A An exemplary rendered side view of a baby stroller.

[0076] Fig. 9C An exemplary side view of a stroller is depicted with a child standing between the handle and the seat and on the rear wheel assemblies in an extended position.

[0077] Fig. 10A An exemplary perspective view of another example of a stroller in a retracted configuration is depicted.

[0078] Fig. 10B Depicts the extended state Fig. 10A An exemplary perspective view of a baby stroller.

[0079] Fig. 10C Depicts the extended state Fig. 10B A baby stroller having an additional seat on the rear wheel assembly.

[0080] Fig.11A A partially exploded perspective view of the rear frame and rear wheel deck is depicted in a retracted position.

[0081] Fig. 11B A partially exploded perspective view of the main components is depicted in an extended state.

[0082] Fig. 12A A right side perspective view of the frame member and rear wheel assembly is depicted in a retracted state.

[0083] Fig. 12B A right side perspective view of the frame member and rear wheel assembly is depicted in an extended state.

[0084] Fig. 12C Depicted when the wheel assembly is in the extended position Fig. 12A A perspective view of a suspension mechanism and a brake mechanism and a frame member.

[0085] Fig.12D Depicted Fig. 12A A right side perspective view of the brake assembly and suspension assembly of the wheel assembly depicted in FIG.

[0086] Fig.12E Depicts the extended state Fig. 12B A right side perspective view of the brake assembly and suspension assembly.

[0087] Fig.13A A cross-sectional view of the suspension assembly showing the rear wheel assembly in an unloaded and retracted state.

[0088] Fig. 13B Shown in loaded and retracted states Fig.13A of the same components.

[0089] Fig. 13C is unloaded and in retracted state Fig.13A and Fig. 13B Rear cross-sectional view of the main components of the wheel assembly.

[0090] Fig.13D yes Fig. 13C The enlarged rear cross-sectional view of the circled portion shows the nested arrangement of the tab of the rear frame within the recess of the rear wheel assembly; and the suspension assembly is nested within the tab of the rear frame.

[0091] Fig.13E An exemplary left perspective view of a suspension assembly rear frame member and axle in a retracted state when unloaded is depicted.

[0092] Fig.13F Another perspective view of the suspension assembly rear frame member and axle in a retracted state when loaded is depicted.

[0093] Fig.14A A cross-sectional view of the suspension assembly showing the rear wheel assembly in an unloaded and extended state.

[0094] Fig. 14B A similar cross section of the suspension assembly of the rear wheel assembly is shown in a loaded and extended state.

[0095] Fig. 14C Depicted is a rear perspective cross-sectional view of a suspension assembly taken through the axle in an unloaded, extended condition.

[0096] Fig.14D Depicted is a right side perspective view of the major components of the suspension assembly in an unloaded, extended condition with the wheels removed for clarity.

[0097] Fig.14E A perspective view of the main components of the rear wheel assembly is shown in an extended state when loaded, with the wheel removed for clarity.

[0098] Fig.15A A partial rear perspective view of the major components is depicted with the brakes not engaged.

[0099] Fig. 15B Depicted with Fig.15A The same detail view, where the brake lever has been actuated downwards.

[0100] Fig. 15C Depicts the extended state with Fig.15A A view of the same components as depicted in the figure, wherein the brake lever is not actuated.

[0101] Fig.16A Depicted is the right side brake mechanism viewed from the rear of the assembly showing the brake pin disengaged from the hub.

[0102] Fig. 16B Depicted Fig.16A The right brake mechanism of FIG. 1 , wherein the brake pin engages with the hub.

[0103] Fig. 16CA cross-sectional view of the interior of a brake paddle is depicted.

[0104] Fig.17A Depicted is a rear view of the rear wheel assembly with the latch assembly in the latched position.

[0105] Fig. 17B Describes Fig.17A A rear view of the latch assembly depicted in FIG. 1 , wherein the latch assembly is in a disengaged state.

[0106] Fig. 17C Depicted is a rear view of the rear wheel assembly in an extended state with the latch assembly engaged.

[0107] Fig.17D A partial view of the rear wheel assembly is depicted with the latch assembly engaged and with other components removed for clarity.

[0108] Fig.18A Depicted is an exemplary left perspective cross-sectional view of a portion of a rear stroller arm and rear wheel assembly with the suspension assembly and brake assembly removed and with the latch mechanism engaged and the assembly in an extended state.

[0109] Fig.18B Depicted is an exemplary right side perspective view of a portion of a rear stroller arm and rear wheel assembly with the suspension assembly and brake assembly removed and with the latch mechanism engaged and the assembly in a retracted state. DETAILED DESCRIPTION

[0110] Various embodiments of the present disclosure are discussed in detail below. Although specific implementations are discussed, it should be understood that this is done for illustrative purposes only. Those skilled in the relevant art will recognize that other components and configurations may be used without departing from the spirit and scope of the present disclosure.

[0111] The disclosed technology addresses the need in the art for a stroller that is capable of seating one occupant or two occupants in an extended configuration.

[0112] Advantageously, the operating mode of the stroller of the present disclosure can be changed relatively quickly and without tools between a single-passenger carrying configuration and a two-passenger carrying configuration, the two-passenger carrying configuration having an extended wheelbase. Such an extended wheelbase allows for increased space between a seat and / or a carrycot in which an occupant is carried.

[0113] Reference now Figures 1A to 1G , and for more details refer to FIG. 2A to FIG. 2C As can be seen, these figures depict a stroller 10 having a seat 12 in a seat frame 14. A handle 16 can be grasped by a parent or caregiver to propel the stroller 10.

[0114] An exemplary stroller 10 is shown having a Figures 1A to 1G and the rear wheel assembly 40 with wheels 50 mounted thereon can be seen in a standard or non-extended configuration. The same stroller 10 is also depicted with a single passenger seat 12 in a forward or world-facing orientation; and the rear wheel assembly 40 with wheels 50 mounted thereon can be seen in a standard or non-extended configuration. FIG. 2A to FIG. 2C The seat 12 is oriented in a rearward or parent-facing orientation. Similarly, the rear wheel assembly 40 with the rear wheel 50 mounted thereon is in a standard or non-extended configuration. Figures 1A to 1G and FIG. 2A to FIG. 2C The position of the rear wheels in FIG. 3A to FIG. 3F , wherein the distance between the rear wheels and the front wheels is increased.

[0115] In the various figures of the present disclosure, it should be understood that for the sake of clarity, the stroller can remove various accessories / soft accessories, including the seat, seat cover, handle cover, basket, etc.

[0116] like Figures 1A to 1G and FIG. 2A to FIG. 2C , the front lower frame 20 is pivotally attached to the rear frame 30 at the hub 22. The rear frame 30 includes 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.

[0117] The rear frame section 30 is pivotally connected to a rear wheel assembly 40 to which a rear wheel 50 is attached. Those skilled in the art will appreciate that while a pair of wheels 50 are depicted, multiple wheels, side by side or of different sizes, may be used without departing from the scope of the present disclosure.

[0118] The front frame 20 and the rear frame 30 in the stroller are connected at the bottom of the frame by a hinge 24, which includes a first inner portion 26a and a second inner portion 26b. Alternative arrangements of this connection between the front frame 20 and the rear frame 30 are also possible without departing from the scope of the present disclosure.

[0119] Also depicted is a brake mechanism 60 that includes a brake paddle 62 having a first arm 64 and a second arm 66 on either side of the center housing.

[0120] As will be appreciated by those skilled in the art, the braking mechanism may include a brake pin that moves into and out of engagement with an aperture formed in the proximal hub in response to actuation of either arm 64, 66 of brake paddle 62 by a user's foot (not shown).

[0121] A similarly configured brake pin may also be moved into and out of engagement with an aperture in the distal hub, wherein actuation of brake paddle 62 by a user's foot proximate the proximal hub is transmitted by a cable arrangement or the like.

[0122] The brake paddle 62 is configured so that the first arm 64 can be Figures 1A to 1G and FIG. 2A to FIG. 2C , Figure 7C The standard position shown in FIG. 1 is operated, and the other arm (second arm 66) can be in the following position: FIG. 3A to FIG. 3F , 4A to 4F , Fig. 7A , Figure 7B and FIG. 8A to FIG. 8C In the extended configuration depicted in FIG.

[0123] The brake paddle 62 is arranged for actuation by a caregiver's foot pushing a brake pin into or out of engagement with a corresponding aperture formed in the circumference of the hub of the wheel 50. However, it should also be understood that a variety of other braking arrangements may be used without departing from the scope of the present disclosure, in which the depicted brake paddle is an optional element.

[0124] In the depicted normal or standard configuration, it can be seen that the rear wheel axle 52 of each rear wheel 50 is engaged with the rear wheel assembly 40. Advantageously, the housing of the rear wheel assembly 40 is connected by Figure 1F and Figure 2B The wheel assembly is attached to the first and second frame arm members 32 and 34 by pivoting at a point marked A in the figure, in this case pivoted to extend and substantially surround the tab portions 33, 35 of the first and second frame arm members 32, 34, which are received in the recesses 41a, 41b. If a suspension is also included, the wheel assembly may also engage with the first and second tab portions 33, 35 of the arm members 32, 34, as shown in reference FIG. 8A to FIG. 8E Depicted.

[0125] In this position, the U-shaped (or similarly shaped) recesses 41a, 41b of the rear wheel assembly 40 are pushed against the arm members by the downward force generated by the mass of the occupant, so that the rear wheel assembly 40 is urged closed. That is, force acts to force the rear wheel assembly against the rear frame 30; and advantageously, there is no need to have any further engagement during operation in the standard unextended configuration. Accordingly, it should be understood that the latch 54 is therefore only used to retain the assembly when the stroller is lifted from the ground and the wheels (and thus the assembly) are no longer pushed against the frame by the reaction force of the ground.

[0126] As depicted, the rear wheel axle 52 is located at a distance from the front wheel. The rear wheel axle 52 is located forward of the pivot connection marked "A" between the rear wheel assembly 40 and the rear frame 30. In this configuration, relative to FIG. 3A to FIG. 3F In the arrangement depicted in FIG, the wheelbase (the distance between the axle of the front ground-engaging wheel and the rear ground-engaging wheel) is reduced.

[0127] Reference now FIG. 3A to FIG. 3F ,in Figures 1A to 1G The stroller depicted in FIG. 1 is shown with the rear wheel assembly 40 in an extended configuration. In this configuration, the rear wheel assembly 40 attached to the rear frame 30 has been rotated under and extended from the tab portions of the first frame arm member 32 and the second frame arm member 34, so that the wheelbase (the distance between the axle of the rear wheels and the axle of the front wheels) is extended.

[0128] In this extended configuration, it can be seen that the upper surface 42 of the rear wheel assembly 40 substantially spans the stroller between the wheels 50 in the extended configuration.

[0129] This surface 42 comprises the feature that is used for providing the foot of the child of standing on the support surface with enhanced grip.In this arrangement, handle 16 can also extend upwardly telescopically, to allow the child to stand in the space between handle 16 and seat frame 14.

[0130] Alternatively, as further discussed in the specification, additional seats, baskets or other accessories (such as a portable crib) may also be mounted to the rear wheel assembly 40 when it is in the extended configuration. These accessories may advantageously properly engage with the voids 55 formed in the upper surface in the extended configuration.

[0131] Although in FIG. 3A to FIG. 3F In the stroller, the main body remains the same Figures 1A to 2C The main overall depiction is the same as in , but further specific reference is made to aspects that require attention.

[0132] In the extended configuration depicted, it can be seen that the rear axle 52 of each rear wheel 50 is engaged with the rear wheel assembly 40. Advantageously, the housing of the rear wheel assembly 40 is attached by a pivot connection at a point marked "A" in the figure, in this case pivoted to extend rearwardly from the tab portions of the arm members 32 and 34 marked "A" in the figure.

[0133] As depicted, with Figures 1A to 2C That is, the rear wheel axle 52 is located behind the pivot connection marked "A" between the rear wheel assembly 40 and the rear frame 30, so the wheelbase (the distance between the axle of the front ground-engaging wheel and the rear ground-engaging wheel) has been increased.

[0134] This increase in the distance of the wheelbase corresponds to doubling the distance between the pivotal connection of the rear wheel assembly to the rear frame, labeled “A”, and the point of attachment of the axle 52 to the rear ground-engaging wheel 50 .

[0135] It should also be understood that, relative to Figures 1A to 1G and FIG. 2A to FIG. 2C , the orientation of brake paddle 62 is substantially reversed.

[0136] Special reference FIG. 3A to FIG. 3F , the recesses 41 a, 42 b are now hidden under the rear wheel assembly 40.

[0137] It should also be appreciated that the latch 54 is now located inside the rear wheel assembly 40, wherein the entire rear wheel assembly 40 has been rotated below and about the pivot connection with the rear frame arm member.

[0138] As in particular FIG. 3A to FIG. 3F As depicted in FIG. 1 , a void 55 can be seen for receiving a corresponding accessory in the housing of the rear wheel assembly.

[0139] Reference now 4A to 4F , depicting various accessory configurations in an extended configuration of a stroller.

[0140] Figure 4A and Figure 4B The combination of the seat is depicted in a parent-facing configuration and a forward-facing configuration.

[0141] The stroller 80 shown has a rear seat 82 supported on the rear wheel assembly 40. A post 84 extends from the hub of the rear seat 82 and is supported or retained within a void 55 formed in the housing of the rear wheel assembly 40. The post 84 is preferably a short plastic / metal rod.

[0142] Importantly, this arrangement shifts the center of mass of the second seat (second occupant) more toward the back of the stroller and closer to the rear wheels.

[0143] refer to Figure 4C and Figure 4D , depicts another exemplary configuration. In this arrangement, the stroller 90 has two seats, wherein both the second rear seat 92 and the front seat 12 are oriented in a world-facing configuration.

[0144] and FIG. 4A to FIG. 4B As with the arrangement depicted in , the rear seats 92 are supported by posts 94 which are received in voids 55 of the rear wheel assemblies 40 .

[0145] Further references Figure 4E , depicting yet another configuration of a second seat on a stroller.

[0146] 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. Likewise, the second seat 102 is supported by a post 104 that is received in a void formed in the housing of the rear wheel assembly 40.

[0147] Likewise, the extended wheelbase allows the center of mass of a rear seated occupant to be moved farther away from and closer to the axis of the rear wheels 50 due to the relative position of the rear wheel assemblies.

[0148] like Figure 5A and Figure 5B , the rear wheel assembly 40 in the extended position can allow a toddler or infant to stand in the gap between the seat 10 and the handle 16. In this arrangement, the gap 55 of the rear wheel assembly 40 does not have any function.

[0149] Brake paddle 62 can be seen in a position where it can be actuated by a parent or caregiver's foot pushing the stroller.

[0150] Reference now FIG. 6A to FIG. 6C , it can be seen that the baby stroller is in Figure 5A The extended configuration depicted in Figures 1A to 1G and FIG. 2A to FIG. 2C The transition positions between the extended configurations depicted in .

[0151] In particular, Figure 5A An exemplary rendered partial top view with Fig. 6A Compare between the transition positions depicted in .

[0152] It can be seen that FIG. 6A to FIG. 6C The rear assembly in the process of pivoting about the pivot connection "A" allows it to move to a shorter configuration in the direction marked "B". Alternatively, if the rear assembly moves in the direction marked "C", the rear assembly moves to the extended configuration.

[0153] As depicted, the recesses 41a, 41b are shaped such that they are sized and dimensioned to substantially receive the corresponding tab locations 32, 35 of the rear frame arm members 32, 34.

[0154] If the rear assembly is moved in the direction labeled “B” to the shorter configuration, the recess extends substantially around the tab portions 33 , 35 of the first and second rear arm members 32 , 34 .

[0155] Alternatively, if the rear wheel assembly is pivoted in the direction labeled "C," the recess is contained on the underside of the rear wheel assembly 40 and in this extended configuration, the recess is inoperative.

[0156] Reference now FIG. 7A to FIG. 7B In the extended configuration of the rear assembly depicted in FIG, brake mechanism 60 is actuated by brake paddle 62, specifically by the user's foot depressing and releasing second arm 66.

[0157] On the contrary, if Figure 7C As depicted in the standard configuration of the rear assembly depicted, brake mechanism 60 is actuated by brake paddle 62 , specifically by a user's foot depressing and releasing first arm 64 .

[0158] In this manner, the same overall braking mechanism, although actuated by different arms 64 , 66 of the paddle 62 , may be used with either configuration.

[0159] Reference now FIG. 8A to FIG. 8E , embodiments of exemplary suspension arrangements that may be included are described.

[0160] As depicted, the rear wheel assembly 40 has a wheel 50 attached thereto. As described herein, the rear assembly pivots about a point labeled "A" in the figure. 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.

[0161] As the rear assembly 40 is rotated from the depicted normal or unextended position, it moves beneath the frame and the locking pin 36 is urged out of engagement with the first arcuate slot 38 and into engagement with the second arcuate slot 39 when the rear assembly reaches the extended position.

[0162] Accordingly, the rear assembly 40 can move in response to uneven ground contact with the corresponding wheel 50, although constrained in both the extended position and the unextended or standard position by the pins in the corresponding arcuate slots and the attachment at the pivot point marked "A." A brake mechanism 60 is also included for reference.

[0163] Further restraint on movement and dampening of such movement may also be provided by including suspension springs 44, 46 in the tab portions of the rear frame.

[0164] These springs are attached to Figure 8B and Figure 8C 1 and 1 . The rear assembly 40 of the rear frame is depicted in hidden outline in an exemplary cross-sectional view of a portion of the rear assembly 40 of the rear frame in a normal or unextended configuration. It should be understood that the relative stiffness of these springs can be selected according to the amount of resistance required in the corresponding configuration. These springs are retained in the tabs 35 (and corresponding tabs 33) of the rear frame. Figure 8BAs depicted in , 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 ; thus, this provides a slightly restricted freedom of movement against the resistance of the springs 44 , 46 .

[0165] exist Figure 8C In the standard configuration shown in FIG. 1 , it can be seen that the load bearing spring is a lower spring 44 which is compressed against the web of the U-shaped recess 41 b on the bottom end of the spring 44 and is retained in the tab 35 at the upper end of the spring 44 in the orientation depicted in the figure.

[0166] Similarly, as in Fig.8D As depicted in FIG. 1 , when the rear assembly 40 is in the extended configuration, the locking pin 36 is retained in the second arcuate slot 35. The springs 44 and 46 are both in Fig.8D However, as depicted in Fig. 8E , the load spring of the exemplary suspension described is the spring 46 shown. The spring 46 is compressed against the web of the inverted U-shaped recess 41b at the top end of the spring 46; and is held in the tab 35 at the lower end of the spring 46 in the orientation depicted in the figure. Since there is more load on the spring in this configuration, it should be understood that a person skilled in the art can choose a spring that is stiffer than the spring 44.

[0167] Reference now Fig.9A As can be seen, an optional basket member 110 may be included and supported on a bar member 112 that is received in the void 55 defined in the rear wheel assembly 40 .

[0168] Advantageously, the rear wheel assembly of the present disclosure enables a stroller to have an extended wheel base.

[0169] The extended wheelbase allows for a variety of configurations, some of which are 4A to 4F Depicted or including Fig.9A and Fig. 9B The accessories depicted in .

[0170] Advantageously, when the rear wheel assembly is in the extended configuration, it allows user accessories to be engaged with the void 55 in the upper surface in this position. These accessories may include a seat (e.g. 4A to 4F ), or a shopping basket (e.g. FIG. 7A to FIG. 7B Various arrangements of ).

[0171] Alternatively, if Fig. 9C, the upper surface of the wheel assembly is a surface that can be used to support a child 116 riding in the stroller—for example, a toddler who may get tired of walking while his or her infant sibling is supported in a carrycot at the front of the stroller. However, it should be understood that these accessories can be obtained only as needed, or added to the stroller when a particular excursion is planned.

[0172] refer to FIG. 10A to FIG. 10C , a stroller 200 is depicted having a seat 212 supported in a seat frame 214 in a world-facing configuration.

[0173] The handle 216 enables the caregiver to propel the stroller and control the steering of the stroller 200. The front frame 220 and the rear frame 230 terminate in ground engaging wheels. The rear wheel on the right hand side is indicated as the rear wheel 250. A brake mechanism 260 located below the rear wheel assembly 240 enables the operator of the stroller 200 to actuate the brake mechanism 260 to prevent the stroller from moving once engaged, especially on an inclined surface.

[0174] exist Fig. 10A In the configuration depicted in FIG, the rear wheel assembly 240 is shown in a retracted state. Fig. 10B As depicted in FIG. 2 , the rear wheel assembly 240 is shown in an extended state in which a void 255 therein is capable of receiving a second seat, a shopping basket, or the like.

[0175] like Fig. 10B As depicted in FIG. 1 , it is apparent that the brake mechanism 260 is now relative to its Fig. 10A The upper surface 243 of the rear wheel assembly 240 is depicted as having an exemplary gripping portion for a toddler or the like who may stand on the rear wheel assembly 240 .

[0176] When the second seat 218 is supported in the second seat frame 219 (which is received in the gap 255 located on the rear wheel assembly 240), the exemplary configuration is Fig. 10C Depicted in.

[0177] Reference now Fig.11A and Fig. 11B , depicts the right rear wheel frame and the right rear wheel assembly in a retracted state and an extended state, respectively, in a partially exploded perspective view. For clarity, the corresponding left assembly has been removed.

[0178] As depicted, rear frame 230 has a rear frame first arm 232 to which is attached a first arm housing 237a having a boss 237. First arm housing boss 237b is sized and shaped to cover a suspension assembly 280 to which an adjacent brake mechanism 260 is attached.

[0179] The common pivot axis of all components labeled with the letter "A" is the pivot axis about which the rear wheel assembly 240 moves between the retracted and extended states. The relative movement and specific orientations of the respective components are further described herein.

[0180] A rear wheel 250 is depicted, which includes a hub 251 that rotates around an axle 252. It should be understood that a similar wheel, axle and hub will be used on the opposite side (left side) of the rear wheel assembly when the assembly is viewed from the rear. Similarly, the front ground-engaging wheel may also include a wheel that rotates around a hub supported on an axle (not shown).

[0181] As depicted, the suspension assembly 280 has a first biasing device or spring 282 supported by a spring cap 283a on an eyelet 283b on a suspension housing 286. A second spring or biasing device 284 is retained within and below the suspension housing 286. The operation of the biasing device or spring of the suspension assembly will be further detailed herein.

[0182] As especially in Fig.11A As can be seen in the figure, the recesses 241a, 241b of the rear wheel assembly 240 are configured to receive the tabs of the suspension assembly 280 and the rear frame member 233 therein. Fig.11A , the brake mechanism 260 is received in the raised portion of the housing 257 below the rear wheel assembly 240 in the retracted state. It should be understood that when the rear wheel assembly 240 rotates about the pivot axis marked "A", the raised portion of the rear wheel assembly 240 is located below the brake mechanism 260. The brake mechanism 260 can be actuated by a brake paddle 262, which includes a first brake arm 264 and a second brake arm 266 attached to the body. It should be understood that the brake mechanism 260 must also be retracted from the rear wheel assembly with the rear wheel assembly. Fig.11A The retracted configuration depicted in FIG. 1 is rotated to Fig. 11B The extended configuration depicted in .

[0183] Specific reference Fig. 11B In the extended configuration depicted in FIG, it can be seen that the suspension assembly is relatively Fig.11A The orientation depicted in is reversed. Fig.11A There is also a brake mechanism 260 in the opposite direction.

[0184] The brake mechanism 260 extends partially through a large hole 257 formed in the wall of the rear wheel assembly recess 241a. The brake mechanism 260 extends through this hole 257 so that the brake pin 268 can move into and out of engagement with the hub 251 of the associated wheel.

[0185] The void 255 is configured to receive an additional seat or basket, as further described. It should be understood that the first surface 242 of the rear wheel assembly 240 is Fig.11A When the component 240 rotates about the pivot point A, the first surface 242 becomes Fig. 11B The lower surface of the rear wheel assembly 240 in the extended state is depicted in FIG.

[0186] The arcuate slot 247 receives a brake pin 268; while the other slot 245 receives an axle 252 of a rear wheel, as will be discussed further below.

[0187] Advantageously, when the axle of wheel 252 is extended through suspension assembly 280 and brake mechanism 260, translation of both about the pivot axis marked "A" extends the track or dimension between the rear wheel axle and the front axle of the front ground-engaging wheel. As already discussed with reference to the embodiments depicted in Figures 1 to 8, the extended configuration provides greater operational stability, albeit with some compromise in maneuverability. The extension is equal to twice the distance between the wheel axle and the pivot axis of the assembly, which is advantageously 60 mm (thus a 120 mm extension), although other lengths may be used without departing from the present disclosure.

[0188] refer to Fig. 12A , depicts a right side perspective view of a portion of the rear frame first arm member 232 and the rear wheel assembly 240.

[0189] The tab portion 233 (the first portion 233a, the second portion 233b) defines a space in which the rear wheel assembly first recess 241a is received. Fig.11A and Fig. 11B The suspension assembly 280 depicted in FIG. 2 is located in the first recess 241a. The pivot axis marked "A" is also visible, about which the rear wheel assembly 240 rotates in the direction marked by the arrow.

[0190] Reference now Fig. 12B , depicts a similar view of the frame members of the rear frame 230 and a portion of the rear wheel assembly in an extended state, wherein the rear wheel has been removed for clarity. Fig. 12A In the retracted state depicted in FIG, the upper surface of the rear wheel assembly 240 is the surface 243 below the first surface 242 of the wheel assembly 240. In this configuration, the pivot axis of the recess 241a of the rear wheel assembly is marked as "A". The boss 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.

[0191] Also visible is the void 255 into which a seat post for a second seat or shopping basket may be received. In this state, the brake mechanism 260 is visible near the recess 241a of the rear wheel assembly 240. The axle of the wheel 252 is movable within the sleeve 288 and the aperture or slot 245 formed in the housing of the rear wheel assembly defining the recess 241a. Also visible is the arcuate slot 247 into which the brake pin 268 is received.

[0192] refer to Fig. 12C , depicting the rear frame and suspension assembly 280 and brake mechanism, wherein the rear wheel assembly 240 has been removed for clarity. It should be understood that in this configuration, the rear wheel assembly will be in an extended configuration, wherein the axle 252 is located behind the pivot point marked "A".

[0193] It should be understood that reference Fig. 12C and Fig.12D , the suspension assembly 280 and the brake assembly 260 rotate together when the rear wheel assembly moves between the retracted state and the extended state. That is, generally most of the components of these assemblies do not rotate or change orientation independently relative to each other, so that the components of these assemblies maintain the same position relative to each other in either state. The limitation to this is the first biasing device 282 and the spring cap 283a, which are received in the eyelet 283b on the suspension housing in the retracted state.

[0194] The first biasing means 282 and the eyelet cap 283a are held in the space defined between the tab portions 233a, 233b of the housing which extend from the rear frame first arm 232 when in the extended state. In this state, they are inoperable.

[0195] When the rear wheel assembly moves from the extended state to the retracted state, the first biasing device 282 and the eyelet cap 283a are seated in the eyelet 283b on the suspension housing to provide suspension.

[0196] refer to Fig.12D , depicting a brake mechanism 260 adjacent to the suspension assembly in a retracted configuration of the rear wheel assembly. A first brake arm 264 and a second brake arm 266 (which can be seen on the brake assembly) and a brake pin 268 protruding through the suspension assembly 280.

[0197] The suspension assembly 280 includes a generally u-shaped housing 286 in which an eyelet 283b receives a spring cap 283a which is attached to a first spring or biasing device 282. Below the housing 286, a second spring or biasing device 284 is attached. A screw or fastening device 289 holds the suspension assembly together and engages the brake mechanism 260. Also visible is a sleeve 288 for receiving the axle of the rear wheel (not shown) and a pivot axis "A" about which the suspension assembly 280 and attached brake mechanism 260 rotate as they move between the retracted and extended states.

[0198] Reference now Fig.13A , depicts a cross-sectional view of the suspension assembly of the rear wheel assembly in an unloaded and retracted state. Similarly, Fig. 13B The suspension assembly is depicted in a retracted state but under a loaded condition, such as may be experienced during operation of the suspension traveling over a bump. Advantageously, the gripping portion is exposed on the upper surface of the rear wheel assembly 240 only in the extended state.

[0199] refer to Fig.13A and Fig. 13B Both, the rear frame 230 and the rear frame first arm 232 are visible.

[0200] Also visible is a projection 237b in the first arm housing 237a in the tab portion of the first arm 233a. The suspension assembly 280 has a first biasing device or spring 282 with a cap 283a. The first biasing device or spring 282 and the cap 283a are received in an eyelet 283b located on the suspension housing 286. As depicted, a second biasing device or spring 284 is provided in the Fig.13A It does not work in the retracted configuration.

[0201] As depicted, the axes of the first biasing device 282 and the second biasing device 284 are axially aligned, however, it should be understood that the axes need not be so aligned.

[0202] The pivot axis about which the suspension assembly 280, brake mechanism 260, and rear wheel assembly 240 rotate is labeled "A." A sleeve 288 in the suspension assembly aligns with a corresponding aperture (not shown) in the tab portion of the first arm 233a to receive the axle of the rear wheel inserted therethrough (not shown). An aperture in the rear wheel assembly housing 245 is also depicted through which the axle 252 extends.

[0203] A portion of the slot 247 for receiving the locking pin in the rear wheel assembly is also visible. The gap is not available in the retracted configuration 255. The arrow indicates the direction to change the rear wheel assembly from the retracted configuration to the extended configuration.

[0204] Now specific reference Fig. 13B, it can be seen that there is Fig.13A However, in this figure it can be seen that the rear leg moves downward under load causing the first spring or biasing device 282 to compress and the cap 283a to move out of the eyelet 283b on the suspension assembly housing 286.

[0205] It should be understood that during operation of the suspension under load, the remainder of the suspension assembly is substantially static. This means that the suspension resists downward movement of the frame relative to the rear wheel assembly by compressing the first biasing means or spring 282. Fig. 13B , the arrow indicates the direction in which the rear wheel assembly moves about the pivot axis A to the extended configuration.

[0206] Reference now Fig. 13C , depicting the retracted and unloaded state Fig.13A 2 is a rear cross-sectional view of the major components of the rear wheel assembly in FIG. The cross-sectional view is taken through the pivot axis marked "A" in the previous figures. The frame 230 and the rear frame first arm 232 can be seen. The axle 252 of the rear wheel 250 extends through the rear wheel assembly 250, the tab portion of the first arm 233a, the suspension assembly 280, the tab of the first arm 233b, and the brake mechanism 260.

[0207] 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, such as Fig.13D Detailedly shown in FIG. The brake mechanism 260 is received below the rear wheel assembly, adjacent to the tab 233b of the first arm of the rear frame, but operates on the hub 251 of the rear wheel. The latch 254 for retaining the rear wheel assembly is also visible.

[0208] Reference now Fig.13D , depicting Fig. 13C 24. In this figure, the recess 241a of the rear wheel assembly is defined by wall members 241c, 241d and receives the tabs 233a and 233b of the first arm of the rear frame therein. The suspension assembly housing 286 is also visible.

[0209] As depicted, the recess of the rear wheel assembly 241a, the tabs 233a and 233b of the rear frame member, and the housing 286 of the suspension assembly 280 are shown in cross-section as three substantially "U-shaped" arrangements. It should be understood that these U-shapes are depicted in one state and orientation relative to each other; however, other orientations are possible. It should be noted that when the suspension assembly 280 and the recess 241a rotate about the pivot axis "A", they maintain the same orientation relative to each other. However, the relative position of these components relative to the tabs 233a, 233b of the rear frame first arm changes between the retracted state and the extended state as they rotate about the pivot axis "A".

[0210] Reference now Fig.13E , showing the retracted state and without load Fig.13A A perspective view of the main components of the rear wheel assembly depicted in FIG. Fig.13F The corresponding view in depicts the same components in a retracted state but under load, and thus the figure is Fig. 13B External view of the components depicted in .

[0211] like Fig.13E and Fig.13F As depicted in both, the rear frame 230 and the 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. The first brake arm 264 of the brake mechanism 260 is visible. The suspension assembly 280 is received between the tab portions of the first arms 233a to 233b. The pivot point A about which the rearview assembly and the suspension assembly and the brake mechanism pivot is labeled "A". The axle 252 is received in the aperture 245, and the aperture or slot for the brake pin 247 is also visible in this configuration. The arrow indicates the direction in which the rear wheel assembly rotates to move from the retracted configuration shown. Fig.13E The status and Fig.13F The main difference between the states in is that Fig.13F An applied load is depicted which compresses the first spring 282 and spring cap 283a against an eyelet 283b on a suspension housing 286 (not shown).

[0212] It should be noted that the shaft remains in the top of the slot 245, as the slot is only operable in the extended state.

[0213] Only the rear frame first arm 232 moves downwardly under the load.

[0214] refer to Fig.14A and Fig. 14B, depicts cross-sectional views of the major components of the rear wheel assembly in an extended state without load and in an extended state with load, respectively. As depicted, the rear frame 230 and the rear frame first portion 232 terminate in a housing 237a. The first biasing device or spring 282 and the cap 283 are retained in the housing 237a of the first arm portion.

[0215] The vertical face 236 abuts and contacts the complementary vertical face of the rear wheel assembly 240. In the extended state depicted, this engagement effectively means that any forces or loads on the outrigger frame are transferred 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 that force is transferred downwardly to the second biasing device or spring 284, thereby compressing it against the underside of the suspension assembly 280.

[0216] In this extended state, it will be appreciated that the first spring or biasing means is not operable.

[0217] A clearance for the rear wheel assembly 255 can be seen to receive the post of a seat or basket inserted therein.

[0218] The pivot entry about which the suspension assembly 280, brake mechanism 260 and rear wheel assembly 240 rotate is labeled "A." An aperture 288 for receiving the wheel axle in the suspension housing is also visible.

[0219] Specific reference Fig. 14B , it can be seen that the force applied to the rear frame compresses the second spring or biasing means 284 downwards, which in turn means that the frame appears to move upwards, as shown. Fig. 14B Depicted in.

[0220] As depicted, it will be appreciated that the suspension assembly 280 remains in a generally horizontal orientation relative to the wheel axle. This means that the rear frame first arm appears to move upward as depicted.

[0221] Reference now Fig. 14C , depicting the extended and unloaded states Fig.13A 2 is a rear cross-sectional view of the major components of the rear wheel assembly in FIG. As depicted, the rear frame 230 and the rear frame first arm 232 terminate in a housing 237a in which the suspension assembly 280 is received. The brake mechanism 260 is located adjacent the housing 237a and recess 241a of the rear wheel assembly 240. The rear ground-engaging wheel 250 rotates about the axle 252 with the hub 251. The section is taken through the wheel / axle axis.

[0222] Fig.14DA perspective view of the major components of the rear wheel assembly in an extended and unloaded state is depicted. It can be seen that the wheel has been removed for clarity, but the axle 252 is shown protruding through the aperture 245 in the rear wheel housing that receives it. The arcuate slot 247 for the brake pin 268 is also visible. The pivot axis is again marked "A". The second surface of the rear wheel housing 243 is also visible, which is now uppermost in orientation, and the brake mechanism 260 has a second brake arm 266.

[0223] refer to Fig.14E , depicting the rear frame of the rear wheel assembly 240 in an extended state under load. The frame 240 and the rear frame first arm 232 are visible, as are the first arm housing 237a and the first arm housing boss 237b.

[0224] As depicted, the vertical face 236 of the housing 237 abuts a corresponding vertical face of the rear wheel assembly housing. As depicted, the second surface 243 of the rear wheel assembly 240 and the brake mechanism 260 and second brake arm 266 can be seen.

[0225] Under load, the brake pin 268 travels to the top of the arcuate slot 247. Similarly, the axle 252 of the rear wheel is located at the top of the aperture in the rear assembly housing 245. The brake pin 268 is located in the slot 247 so that it can move into and out of engagement with the hub 251 of the rear wheel (not shown).

[0226] As depicted, the rear wheel assembly pivots about an axis labeled "A."

[0227] The forces acting through the rear frame and / or acting on the rear wheel assembly compress the second biasing means or spring 284, which causes the arm to appear to move upward. Fig.15A , depicts a partial rear perspective view of the major components with the brake mechanism 260 in a retracted state and not engaged. 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 user's foot to actuate the brake pin to engage the hub and travel to Fig. 15B Once the user releases their foot, the pedal returns to the position depicted in Fig.15A , wherein the brake pin is engaged, as further described herein.

[0228] Reference now Fig. 15B , the same components can be seen with the brake pin engaged in the retracted state and the first brake arm now relatively lower than it was in the Fig.15A The location depicted in .

[0229] Reference now Fig. 15C, similarly depicting the rear wheel assembly and brake mechanism 260 and rear wheel 250. In this position, the brake is also not engaged, wherein the second brake arm 266 can be actuated by the user's foot.

[0230] Referring now to FIG. 15D , the brake mechanism is depicted in an engaged state, in an extended configuration. As depicted, the second brake arm 266 is relatively lower than its position in the Fig. 15C Similarly, once the user's foot is released, the brake pin remains engaged with the hub and the brake pedal returns to Fig. 15C The state depicted in .

[0231] Fig.16A and Fig. 16B A cross-sectional perspective view of the brake mechanism is depicted in an unlocked state and a locked state, respectively.

[0232] As depicted, the brake pin 268 is housed in and protrudes from the open end of a substantially cylindrical brake pin follower 270. The other end of the brake pin follower 270 is closed and has a flat face 271a and an inclined face 271b that tapers rearwardly; the brake pin is received in the other end of the brake pin follower 270 in a direction away from the actuator and rearwardly relative to the axis defined by the actuation of the brake pin 268.

[0233] The flat surface 271a and the inclined surface 271b of the brake pin follower 270 are urged against the inclined surface 276 of the actuator 272 in sliding contact by the spring 274. The rotation of the brake paddle 262 by the user's foot drives the brake actuator 272 to rotate; and the various sections of the inclined surface of the actuator 276, as described in further detail below.

[0234] In particular, the face of the actuator has three main actuation areas, each of which substantially comprises four main sectors.

[0235] As depicted, first portion 275a includes a portion 276a that is substantially perpendicular relative to the axis of movement of brake pin 268 (marked by arrow "B"); and an inclined portion 276b corresponding to an unlocked state of the brake pin; wherein the brake pin does not engage any hole (depicted in phantom for reference) formed in hub 251. As depicted, faces 271a and 271b abut 276a and 276b when the brake is retracted.

[0236] In this state, the wheel can rotate freely.

[0237] In the second section 275b of the inclined surface 276 of the actuator 272, the inclined portion continues in 276c. This inclined surface 276c corresponds to the transition state of the wheel from the unlocked state to the locked state.

[0238] As the pedal is depressed (via the pawl), portion 272 is rotated, 271b rides against 276c, and thus moves axially forward toward or against the wheel / hub. When the rotation is complete, 271a passes over lip 276d, and 271a abuts 276e, and enters fully engaged section 275c. The pedal then returns via its own spring, but the internal parts remain stationary during this pedal return.

[0239] In this third section 275c of the actuator 272, the brake pin 268 is extended in the locked state and is pushed out into a corresponding hole formed in the hub 251. This axial movement occurs due to another substantially flat or perpendicular surface 276d relative to the axis of movement of the brake pin, which pushes the brake follower and therefore the brake pin through the wall of the suspension assembly 280 to engage the hub.

[0240] In the fourth section 275d of the actuator 272, there is a portion of another inclined surface 276h; however, this surface is not inclined as steeply relative to the inclined surface 276b.

[0241] To disengage the brake in section 275d, flat face 271a of brake follower 270 travels upward and over ramped surface 276f, which is an inclined surface rather than a flat surface in an attempt to maintain the relationship of these parts relative to each other and limit accidental rotation of actuator 272 due to vibration or the like.

[0242] As the pedal continues to rotate 272 via the pawl, the flat surface 271a of the brake follower 270 then lands on the chamfered surface 276h, which then allows the brake pin to fully retract in section 275e.

[0243] In section 275e, flat surface 271a of brake follower 270 returns to abutment 276m (and corresponding inclined surface 271b terminates abutment 267n).

[0244] Reference now Fig. 16B , depicting the rotation of the actuator 272; the rotation is driven by the user's foot actuating the pedal. It can be seen that the brake pin follower 270 is located in the third section 275c, wherein the inclined surface 276f forces the brake follower to abut against the spring 274 and thus engage the brake pin 268 with the hub 251.

[0245] Further rotation of the actuator 272 will then drive the follower over the lip 276h and into the first segment 275e (which is another form / example of the first segment 275a) of the next region (entering segments 276m and 276n); this region in turn consists of the same four main segments detailed above.

[0246] Thus, rotation of the brake mechanism actuator 272 causes linear displacement of the brake pin 268 into and out of engagement with the hub 251 .

[0247] Fig. 16C A cross section through the brake mechanism 260 is depicted. The first arm 264 and the second arm 266 can be actuated by the user's foot. Actuation of these arms drives rotation of the brake paddle, causing structures 277a, 277b, 277c, 277d, 277e, 227f in the brake paddle 262 to in turn successively drive a pawl 273 that projects from the actuator 272 and is biased to engage with one of the structures. Rotation of the sliding contact of the pawl 273 engaged with these structures thus causes the actuator 272 to rotate; and Fig.16A and Fig. 16B Detailed locking and unlocking behavior. Each of the structures of brake paddle 262 includes an inclined surface and an engagement surface on which the pawl travels when brake paddle 262 rotates.

[0248] It will be appreciated that a cable or the like may transmit a change in state / position of the brake pin 268 to rotate a similar actuator 272 located in the brake mechanism (not shown) of an adjacent wheel.

[0249] Advantageously, the cable can be attached to the brake pin follower 270 on the right side of the brake system; and then configured to rotate the actuator in the left brake mechanism (similar to the actuator 272 of the depicted right brake system). This arrangement ensures that both the left and right brake pins are in the same state; and there is no state where the brake pin on one side is engaged and the brake pin on the other side is disengaged.

[0250] Fig.17A and Fig. 17B The latch mechanism 290 is depicted in the locked position ( Fig.17A ) and unlocked position ( Fig. 17B ) between.

[0251] like FIG. 17A to FIG. 17C , the rear frame first arm 232 and the rear frame second arm 234 terminate at the ground contacting wheel 250. The suspension assemblies 280a, 280b are received in the recesses 241a, 241b of the rear wheel assembly 240; within the space defined between the corresponding tabs of the arms of the rear frames 232, 234. The primary (master) brake mechanism 260a is located adjacent to the suspension assembly 280a; and the "slave" brake mechanism 260b is adjacent to the suspension assembly 280b on the other side.

[0252] like Fig.17AAs depicted in the figure, the latch slides 292a, 292b are stationary in the outward position; this means that a latch pin (not visible) connected to the latch slides is engaged with the first arcuate slot 238 (not shown) (it should be understood that, as depicted, the rear wheel assembly is in a retracted state).

[0253] refer to Fig. 17B , the latch slides 292a, 292b have been moved inwardly by the user's fingers; thereby retracting the locking pin and disengaging it from the first arcuate slot 238 (not shown).

[0254] This allows the rear wheel assembly to move to Fig. 17C , in which the latch pin (not visible) is engaged within the aperture 239 in an extended and latched state.

[0255] Fig.17D An exemplary view of a latch assembly and brake pin is depicted with other components (including surfaces of a rear wheel assembly) removed for ease of reference. Rear wheel 250 and hub 251 are supported on shaft 252, with brake pins 268a, 268b and brake pin followers 270a, 270b engageable with the hub. Brake cable 269 transmits actuation of the actuator of the right main brake mechanism (not shown) to actuation of the left brake mechanism (not shown).

[0256] It can be seen that the latch slides 292a, 292b are biased outwardly by the latch coil springs 294a, 294b, and user actuation to move them together shortens the cables 296a, 296b and thereby pulls the latch pins 298a, 298b against the latch cable springs 297a, 297b and out to disengage from the recesses 241a, 241b defined in the rear wheel assembly 240 and the arcuate slots 238, 239 in the tab portion 233 of the first arm and the tab portion 235 of the second arm.

[0257] Reference now Fig.18A , shows an exemplary left perspective cross-sectional view of a portion of a rear stroller arm and rear wheel assembly in an extended state, wherein the wheel, suspension and brake assembly have been removed. As depicted, the first arm housing 237a of the rear frame first arm 232 holds the first spring or biasing device and spring cap in the depicted boss 237c. In this state, only the second biasing device or spring is active in the suspension assembly 280.

[0258] The suspension assembly (not shown) and the brake assembly (not shown) are rotatable about a pivot point marked A defined in the tab portion of the first arm 233b.

[0259] In this state, the latch pin 298 extends through the hole 239 of the tab portion 233 b of the first arm 232 .

[0260] A void 255 on the rear wheel assembly is positioned to receive a second seat / basket; and a hole 257 in the housing for receiving the suspension assembly 280 and attached brake mechanism 260 is also visible. It should be understood that the hole 257 is sized / shaped so that the brake system 260 and suspension 280 can move to allow the suspension to operate in the extended state.

[0261] exist Fig.18A 2, the housing of the rear wheel assembly 240 and the rear legs 232 act together to load the suspension spring (not shown) together. The rear wheel assembly and the rear legs are able to act together to load the suspension spring because of the contact between the vertical surface 236 of the rear frame first arm 232 and the corresponding vertical surface of a portion of the rear wheel assembly 240, and the engagement of the locking pin 298 in the hole 239.

[0262] refer to Fig.18B , it can be seen that the latch pin 298 remains in the arcuate slot 238 so that the rear wheel assembly 240 will not "fall out" when the entire stroller is lifted. The arcuate slot and suspension assembly (not shown) enable the rear wheel assembly to move relative to the frame via the suspension assembly under load as discussed herein.

[0263] Thus, the same stroller is compact in the standard configuration, with the associated handling benefits of a shortened wheelbase (the distance between the centers of the front and rear wheels).

[0264] As needed, the same stroller can then be changed to an extended wheel base version that provides the caregiver with the instant flexibility of an extended wheel base without the use of any tools. Accordingly, the rear wheel assembly of the present disclosure provides flexibility and ease of use that prior art strollers lack.

[0265] It should be appreciated that a rear wheel assembly having a shorter wheelbase and further away from the feet of a caregiver operating the stroller allows more room for a natural stride length. Depending on the height of the caregiver, this may mean that the caregiver is more likely to potentially compromise their natural stride when the rear wheel assembly is extended.

[0266] Additionally, it should be appreciated that the ability of different springs to operate in either a retracted or extended state, as described herein, allows the suspension to be different (potentially stiffer) when extended when greater weight / loads are expected on the stroller.

[0267] Since the rear wheel assembly is able to rotate underneath / downward, it engages through two suspension conditions, namely, in an extended state and a retracted state.

[0268] Advantageously, the flat vertical surface 236 disclosed herein enables the disclosed rear wheel assembly to operate without any latches if desired. If the rear wheel is lifted from the ground, the latches described herein hold the rear wheel assembly in any desired state.

[0269] It will be appreciated by those skilled in the art that in the extended state, the actual load is transmitted via the vertical faces 236 described above.

[0270] The arrangement of the present disclosure can be compared to an alternative configuration if the rear wheel assembly is rotated outward and above the pivot axis. In this alternative configuration, any load on the rear wheel assembly in the extended state will tend to push the board back to the retracted state, and therefore the latch in this configuration needs to be a structural part of the system to resist the application of such loads.

[0271] As disclosed herein, the void 255 for the rear seat / cot / car seat / accessory attachments is only available when the rear portion has been extended, which prevents the caregiver from manipulating the stroller to include these attachments in the retracted state. Advantageously, this prevents incorrect configurations that could cause problems with the center of gravity and handling issues that could also cause safety issues (such as tilt test failures, etc.).

[0272] It should be understood that the stroller or foldable stroller described herein is a small stroller with good maneuverability in the retracted state, which can be converted into an extended stroller as and when needed and is more stable and easier to operate for a caregiver.

[0273] It will also be understood that when the extended wheelbase is no longer needed (e.g., when the second child recovers his energy or separates from the parent or caregiver), the stroller can then be transformed back into a more compact configuration, with better maneuverability, and the parent / caregiver can continue hiking with another child. Although a variety of examples and other information are used to explain aspects within the scope of the appended claims, limitations on the claims should not be implied based on specific features or arrangements in such examples, because a person of ordinary skill in the art will be able to derive a variety of implementations using these examples. Further, and although a subject may have been described in language specific to examples of structural features and / or method steps, it should be understood that the subject matter defined in the appended claims is not necessarily limited to these described features or actions. For example, such functionality may be distributed differently or performed in components other than those identified herein. Instead, the described features and steps are disclosed as examples of system components and methods within the scope of the appended claims.

[0274] A rear wheel assembly is provided, the rear wheel assembly being pivotally connected between rear frame members of a stroller and having rear wheels attached thereto; wherein the rear wheel assembly is movable beneath the rear frame of the stroller between a first stowed position in which the rear wheels are held forward of a pivotal connection with the stroller and a second position in which the rear wheels are rearward of the pivotal connection with the stroller.

[0275] Optionally, in the first load-bearing position, the rear wheel assembly is configured to receive the rear frame members in corresponding recesses defined therein such that each recess is urged against each rear frame member under load.

[0276] Preferably, in the first stowed position, the recess of the rear wheel assembly is a channel dimensioned to receive a corresponding rear frame member therein.

[0277] In the first loading position, the rear wheel assembly may be releasably retained on the stroller via a latch mechanism.

[0278] The rear wheel assembly may include an aperture for releasably securing an axle of the rear wheel attached thereto.

[0279] In this second position may include voids on each side of the upper surface for receiving corresponding protrusions therein, preferably for receiving protrusions of a seat frame or basket.

[0280] Preferably, the web spans between the rear frame members, the rear frame members having gripping members engageable with a child's foot thereon in at least the second position.

[0281] Advantageously, the rear wheel assembly further comprises a brake paddle actuatable in the first position or the second position to engage and disengage sliding members with corresponding apertures defined in the hubs of the wheels.

[0282] A suspension assembly may be provided on either side of the rear wheel assembly, the suspension assembly comprising at least one biasing device provided adjacent each pivotal connection between the rear arm and the rear wheel assembly.

[0283] The at least one biasing device of each suspension assembly includes a first spring and a second spring having spring constants that are different from each other.

[0284] Preferably, the first spring of the suspension assembly is attached at one end within the rear frame such that the first spring is disengaged from the suspension assembly when the rear wheel assembly is in the second load-bearing position.

[0285] Advantageously, the second spring of the suspension assembly is arranged to be compressible by the suspension assembly in the second load-bearing position.

[0286] Preferably, the rear wheel assembly has a face configured to bear against a complementary face of the stroller rear frame assembly when engaged with the stroller rear frame assembly in the second stowed position so as to transfer loads applied thereto to the suspension assembly.

Claims

1. A baby stroller comprising a lower frame, the lower frame comprising: a front frame section connected to a rear frame section, wherein the rear frame section includes a rear wheel assembly extending between two rear frame members; wherein the rear wheel assembly is pivotally connected to two rear frame members and has a rear wheel attached thereto; the rear wheel assembly is movable between a first load-bearing position and a second position beneath the rear frame section, wherein the rear wheel is held in front of the pivot connection and wherein the rear wheel is behind the pivot connection.

2. The baby stroller according to claim 1, wherein: In the first load-bearing position, the rear wheel assembly receives the rear frame members in corresponding recesses defined therein such that each recess is urged against each rear frame member under load.

3. The baby stroller according to claim 1 or claim 2, wherein: In the first stowed position, the recess of the rear wheel assembly is a channel sized to receive a corresponding rear frame member therein.

4. A stroller as claimed in any one of the preceding claims, wherein: In the first stowed position, the rear wheel assembly is releasably retained in the position by a latch mechanism.

5. A stroller as claimed in any one of the preceding claims, wherein: The tab of each rear frame member includes an aperture for receiving a pivot member engageable with the rear wheel assembly for pivotal connection thereof.

6. A stroller as claimed in any one of the preceding claims, wherein: The rear wheel assembly includes an aperture for releasably securing an axle of a rear wheel attached thereto.

7. A stroller as claimed in any one of the preceding claims, wherein: The rear wheel assembly includes a void on each side of the upper surface in the second position for receiving a corresponding protrusion therein.

8. A stroller as claimed in any one of the preceding claims, wherein: The voids are configured to receive protrusions of a seat frame, carrycot, car seat, or basket.

9. A stroller as claimed in any one of the preceding claims, wherein: The rear wheel assembly includes a web spanning between the rear frame members, the web being sized to support a child's foot thereon in at least the second position.

10. A stroller as claimed in any one of the preceding claims, wherein: The rear wheel assembly is positioned beneath a rod that extends between the rear frame members in a first position.

11. A stroller as claimed in any one of the preceding claims, wherein: The rear wheel assembly includes a brake paddle actuatable in the first position or the second position to engage and disengage a sliding member with a corresponding aperture defined in a hub of the wheel.

12. A stroller as claimed in any one of the preceding claims, wherein: The rear wheel assembly has a face configured to bear against a complementary face on the rear frame assembly in the second load-bearing position to transfer loads applied thereto to the suspension assembly.

13. A stroller as claimed in any one of the preceding claims, wherein: The rear wheel assembly includes a suspension assembly disposed on either side thereof, the suspension assembly including at least one biasing device disposed proximate each pivotal connection of the rear arm and the rear wheel assembly.

14. The baby stroller according to claim 13, wherein: The at least one biasing device of each suspension assembly includes a first spring and a second spring having spring constants that are different from each other.

15. The baby stroller according to claim 13, wherein: The biasing means comprises a single spring having regions of different stiffness.

16. The baby stroller according to claim 14, wherein: A first spring of the suspension assembly is attached at one end within the rear frame such that the first spring is disengaged from the suspension assembly when the rear wheel assembly is in the second load-bearing position.

17. The baby stroller according to claim 14, wherein: The second spring of the suspension assembly is arranged to be compressible by the suspension assembly in the second load-bearing position.

18. A rear wheel assembly for a baby stroller, the rear wheel assembly comprising: a deck member having two housings configured to receive at least a portion of a rear frame member of a stroller therein, wherein the housings have apertures defined therein for pivotal connection thereto; wherein the rear wheel assembly is movable beneath the rear frame member between a first load-bearing position in which the wheel is held forward of a pivotal connection with the frame member and a second position in which the wheel is rearward of a pivotal connection with the frame member.

19. A 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, in, The method comprises: actuating a latch mechanism to release the rear wheel assembly from the first stowed position in which the 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 a pivotal connection between the rear wheel assembly and the rear frame of the stroller; and Raising the stroller causes the rear wheel assembly to pivot downwardly from beneath the two rear frame members to a second stowed position in which the wheels of the rear wheel assembly are located behind the pivotal connection between the rear wheel assembly and the rear frame of the stroller.

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