Patent Description:
Strollers designed to convert from a single seat configuration to a tandem seat configuration are known in the art. Some manufacturers have offered tandem strollers that are not easily configurable to a single seat configuration. Some manufacturers have offered other tandem strollers that position the seats side-by-side or fixed in-line with one another. Such tandem strollers are typically bulky, not easily maneuvered, and do not provide the ability to selectively position the seats to face forward or parent as desired by the user. Further, while some existing strollers can be configured between a single seat and a tandem seat configuration, these strollers typically require time-consuming and complex steps. In fact, with some such strollers, the seats are generally not intended to be removed from the frame during normal use and require the use of special tools or special skills to accomplish the same.

Some other existing strollers accommodate multiple occupants by providing a seat for one occupant and a standing platform or the like for a second occupant. Other strollers provide a seat for a first occupant and a seat for a second occupant that hangs below and behind the first seat. Such strollers present obvious safety concerns and are often uncomfortable. A further disadvantageous to such strollers is that the under-seat storage present in single strollers is reduced by the existence of the second seat, which eliminates or significantly reduces the usable basket or net space for belongings. <CIT> shows a stroller including a stroller frame, a front seat assembly, and a rear seat assembly. The stroller frame includes two side support assembly disposed oppositely. A front seat space and a rear seat space are formed between the two side support assemblies. The rear seat assembly is detachably and height-adjustably disposed between the two side support assemblies and located in the rear seat space, for performing a function of adjusting a sitting height of a child sitting on the rear seat assembly. The stroller can include an accommodating basket under the front seat assembly. When the rear seat assembly is moved relative to the stroller frame, an expansible side portion of the accommodating basket can spread upward to expand the accommodating space of the accommodating basket.

It would be desirable to provide a stroller that is selectively configurable between a single seat configuration and a tandem seat configuration, namely such a stroller that provides the same without loss of convenience for the user pushing the stroller. In particular, it would be desirable if selective configuration of the stroller could be accomplished without the need for any special tools or any add-on components, as purchasing and storing such tools or components can be both costly and burdensome. Accordingly, it is desired to provide a stroller having connector components that can be easily moved (e.g., by sliding, rotating, or any other suitable method) to quickly and easily configure a single seat stroller to a tandem seat stroller or vice versa as is desired. It would further be desirable if the connector components were adapted to accommodate a wide variety of seats in multiple orientations as desired.

Disclosed herein are strollers, which may be comprised of a frame and connector components adapted to support one or more seats. The connector components may be adapted to support the seat(s) in selectively releasable attachment therewith. In this way, a single stroller structure may be convertible from a single seat configuration to a tandem seat configuration, such as by performing one or more of the following steps: (a) sliding a connector component(s) upwards relative to the frame so as to position the connector component(s) in position to receive a primary seat thereon, and (b) rotating a lower extension relative to the frame so as to position a connector component(s) located thereon in position to receive a secondary seat thereon. Sliding movement of one or more of the connector components relative to the frame may increase the distance between the connector components, which may thereby provide an acceptable separation between the primary and secondary seats for a myriad of possible configurations (e.g., with one or both of the seats facing forward or one or both of the seats facing rearward toward the user of the stroller).

In accordance with the foregoing, disclosed in exemplary embodiments herein are strollers. In accordance with particular embodiments of the present disclosure, an exemplary stroller comprises: an upper frame portion including first and second side struts spaced apart from each other; a lower frame portion including first and second side struts spaced apart from each other; and a pair of primary connector components adapted to support an associated primary seat in selectively releasable attachment therewith, the primary connector components slidably attached to the upper frame portion.

In certain constructions, the first side strut of the upper frame portion may be foldably connected to the first side strut of the lower frame portion. The second side strut of the upper frame portion may be foldably connected to the second side strut of the lower frame portion.

In accordance with embodiments of the disclosure, each of the primary connector components may be non-releasably attached to the upper frame portion. A first one of the primary connector components may be slidably attached to the first side strut of the upper frame portion. A second one of the primary connector components may be slidably attached to the second side strut of the upper frame portion.

In accordance with embodiments of the disclosure, the stroller may further include secondary connector components adapted to support an associated secondary seat in selectively releasable attachment therewith, each of the secondary connector components rotatably attached to the lower frame portion. The secondary connector component may be non-releasably attached to the lower frame portion.

In accordance with embodiments of the disclosure, the stroller may further include a lower extension, the lower extension including the secondary connector components. The lower extension may also include first and second support members spaced apart from each other. The first support member may be rotataby attached to the first side strut of the lower frame portion. The second support member may be rotatably attached to the second side strut of the lower frame portion. A first one of the secondary connector components may be located at a distal end of the first support member. A second one of the secondary connector components may be located at a distal end of the second support member. The lower extension may further include a crossbar running between and interconnecting the first and second support members.

In certain constructions, each of the secondary connector components may be rotatable about an axis parallel to the first and second side struts of the lower frame portion. In alternative constructions, each of the secondary connector components may be rotatable about an axis perpendicular to the first and second side struts of the lower frame portion.

In accordance with embodiments of the disclosure, the primary connector components may be positioned at least partially above the secondary connector components. The primary connector components may be positioned at least partially rearward of the secondary connector components. The primary connector components may be slidable relative to the upper frame portion between an uppermost position and a lowermost position. Sliding of the primary connector components relative to the upper frame portion between an uppermost position and a lowermost position may selectively vary a distance between the primary connector components and the secondary connector components. The primary connector components may be located proximate a forward end of the upper frame portion when in the lowermost position. The primary connector components may be located between the forward end and a rear end of the upper frame portion when in the uppermost position.

In accordance with particular embodiments of the present disclosure, a modular stroller may be selectively configurable between a single seat configuration and a tandem seat configuration. An exemplary modular stroller comprises: an upper frame portion; a lower frame portion; and a lower extension including at least one secondary connector component, the lower extension adapted to rotate between a folded position in which the lower extension lies directly adjacent and substantially parallel to the lower frame portion and an unfolded position in which the lower extension is angled relative to the lower frame portion and the at least one secondary connector components is oriented upwardly.

In accordance with embodiments of the disclosure, the modular stroller may further include at least one primary connector component. The at least one primary connector component may be adapted to slide relative to the upper frame portion. The at least one primary connector component may be adapted to slide between a lowermost position in the single seat configuration and an uppermost position in the tandem seat configuration.

In certain constructions, the at least one primary connector component may be adapted to support an associated primary seat in selectively releasable attachment therewith. The at least one primary connector component may be slidably and non-releasably attached to the upper frame portion. The at least one primary connector component may be positioned at least partially above and at least partially rearward of the at least one secondary connector component. The at least one primary connector component may be located proximate a forward end of the upper frame portion when in the lowermost position. The at least one primary connector component may be located between the forward end and a rear end of the upper frame portion when in the uppermost position.

In accordance with other particular embodiments of the present disclosure, an exemplary stroller system comprises: a primary seat; a secondary seat; and a stroller, the stroller comprising: an upper frame portion including first and second side struts spaced apart from each other; a lower frame portion including first and second side struts spaced apart from each other; a pair of primary connector components adapted to support the primary seat in selectively releasable attachment therewith, the primary connector components slidably attached to the upper frame portion; and a lower extension including a pair of secondary connector components adapted to support the secondary seat in selectively releasable attachment therewith, the lower extension rotatably attached to the lower frame portion.

In certain constructions sliding movement of the primary connector components relative to the upper frame portion may be retarded when the primary seat is selectively attached to the primary connector components.

Other aspects of the invention may be apparent to those of ordinary skill with review of the attached drawings, appended claims, and additional description.

The foregoing and other features of the present disclosure will become more fully apparent from the following description and appended claims, taken in conjunction with the accompanying drawings. Understanding that these drawings depict several examples in accordance with the disclosure and are, therefore, not to be considered limiting of its scope, the disclosure is described with additional specificity and detail below through the use of the accompanying drawings.

In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols identify similar components, unless context dictates otherwise. The illustrative examples described in the detailed description and drawings are not meant to be limiting and are for explanatory purposes. Other examples may be utilized, and other changes may be made, without departing from the scope of the subject matter presented herein. It will be readily understood that the aspects of the present disclosure, as generally described herein and illustrated in the drawings, may be arranged, substituted, combined, and designed in a wide variety of different configurations, each of which are explicitly contemplated and form a part of this disclosure.

It should be noted that some of the terms used herein may be relative terms. For example, the terms "upper" and "lower" are relative to each other in location, i.e. an upper component is located at a higher elevation than a lower component in a given orientation, but these terms may change if the device is flipped. An intermediate component, on the other hand, is always located between an upper component and a lower component regardless of orientation. The terms "horizontal" and "vertical" are used to indicate direction relative to an absolute reference, i.e. ground level. However, these terms should not be construed to require structures to be absolutely parallel or absolutely perpendicular to each other. For example, a first vertical structure and a second vertical structure are not necessarily parallel to each other. The terms "top" and "bottom" or "base" are used to refer to surfaces where the top is always higher than the bottom/base relative to an absolute reference, i.e. the surface of the earth. The terms "upwards" or "upwardly" and "downwards" or "downwardly" are also relative to an absolute reference; upwards is always against the gravity of the earth. The term "parallel" should be construed in its lay sense of two surfaces that maintain a generally constant distance between them, and not in the strict mathematical sense that such surfaces will never intersect when extended to infinity. The terms "operative to" and "adapted to" and similar terms are used herein to describe that a particular component has certain structural features designed to perform a designated function. Such components should be construed as having the expressed structure, with the designated function being considered part of the structure.

As used herein, a component that is "non-releasably attached" to the stroller means the component is designed as permanently attached, such that the component is incapable of being selectively detached by a user without the use of special tools, special skills, or at least partial destruction of the component or the stroller.

In accordance with aspects of the disclosure, exemplary embodiments of strollers and stroller systems are illustrated in various levels of specificity in <FIG>. Very generally, stroller <NUM> is designed for safely transporting one or two infants or children. Stroller <NUM> may be defined by a frame, which frame may include an upper frame portion <NUM> and a lower frame portion <NUM>. One or more primary connector components <NUM> may be incorporated into an aspect of the stroller <NUM>. One or more secondary connector components <NUM> may be incorporated into a lower extension <NUM> of the stroller <NUM>.

As illustrated in <FIG>, the frame of the stroller <NUM> may generally be defined by an upper frame portion <NUM> and a lower frame portion <NUM>. The upper frame portion <NUM> may include a first side strut <NUM> and a second side strut <NUM>. The first and second side struts <NUM>, <NUM> of the upper frame portion <NUM> may be spaced apart from each other. The lower frame portion <NUM> may include a first side strut <NUM> and a second side strut <NUM>. The first and second side struts <NUM>, <NUM> of the lower frame portion <NUM> may be spaced apart from each other.

The first side strut <NUM> of the upper frame portion <NUM> may be foldably connected to the first side strut <NUM> of the lower frame portion <NUM> (e.g., by a first connection <NUM>). The second side strut <NUM> of the upper frame portion <NUM> may be foldably connected to the second side strut <NUM> of the lower frame portion <NUM> (e.g., by a second connection <NUM>). In this way, the stroller <NUM> can be folded about one or more connections between the first side struts of the upper and lower frame portions and the second side struts of the upper and lower frame portions. As will be appreciated by those skilled in the art, the upper and lower frame portions could be foldably connected to one another in a variety of different ways using a variety of different mechanisms. For example, the first and second connections <NUM>, <NUM> may be, for example, pivoted connections, sliding joints, or the like. In this way, the first side strut <NUM> of the upper frame portion <NUM> may be pivotally or slidably connected to the first side strut <NUM> of the lower frame portion <NUM> so as to be rotatable and foldable with respect thereto, and second side strut <NUM> of the upper frame portion <NUM> may be pivotally or slidably connected to the second side strut <NUM> of the lower frame portion <NUM> so as to be rotatable and foldable with respect thereto.

In some embodiments, the stroller may be folded without removal of either of the primary or secondary seats. In other embodiments, removal of the secondary seat may facilitate increased foldability (i.e., a more compact fold) of the stroller or may otherwise be necessary to facilitate full folding of the stroller. Similarly, rotating of the lower extension <NUM> to the folded position may, in some embodiments, may facilitate increased foldability (i.e., a more compact fold) of the stroller or may otherwise be necessary to facilitate full folding of the stroller.

It is contemplated that the primary seat may not need to be removed in order to fold the stroller. In particular, the stroller may be foldable with the primary seat in either of the lowermost or uppermost positions. In some embodiments, positioning the primary seat in the uppermost position before folding may facilitate increased foldability (i.e., a more compact fold) of the stroller. As will be appreciated by those skilled in the art, the folding of the stroller may decrease the overall size of the stroller, thereby permitting a user to more easily store the stroller (e.g., in the trunk of a vehicle).

The stroller <NUM> includes one or more primary connector components <NUM>. With reference to <FIG>, exemplary stroller <NUM> includes a pair of primary connector components <NUM>. As will be explained in greater detail herein, the primary connector components <NUM> are slidably attached to the upper frame portion <NUM> of the stroller <NUM> so as to be slidable therealong in the direction of arrows <NUM>, <NUM>. When more than one primary connector component <NUM> is provided, such as pair of primary connector components <NUM> described herein, each of the primary connector components <NUM> may be adapted to move independently of all other primary connector components <NUM> or may alternatively be adapted to move simultaneously with one or more other primary connector components <NUM>.

The primary connector components <NUM> are adapted to support a primary seat <NUM> in selectively releasable attachment therewith (see, e.g., <FIG>). That is, the primary connector components <NUM> are designed to cooperatively attach the primary seat <NUM> to the upper frame portion <NUM>, while also permitting the primary seat <NUM> to be quickly and easily detached without the need for any special tools or time-consuming procedures. That is, the primary seat <NUM> can be attached and detached from the stroller <NUM> as desired.

In <FIG>, the primary seat <NUM> is illustrated as being releasably attached to the primary connector components <NUM> such that the primary seat <NUM> faces forward (i.e., such that an occupant of the primary seat would face away from a user pushing the stroller). It is to be understood, however, that the primary connector components <NUM> may be designed such that the primary seat <NUM> may be reversibly attached to the primary connector components <NUM> in either a forward-facing orientation (<FIG>) or rear-facing orientation in which the user pushing the stroller would face the occupant of the primary seat.

In <FIG>, the primary connector components <NUM> are selectively positioned in a lowermost position along the upper frame portion <NUM> of the stroller <NUM>. Selective positioning of the primary connector components <NUM> in the lowermost position may position the primary seat <NUM> releasably attached thereto substantially centrally on the stroller. As such, selective positioning of the primary connector components <NUM> in the lowermost position may be preferable when the stroller is desired to be used in a single seat configuration.

The stroller <NUM> further includes a lower extension <NUM>. As will be explained in greater detail herein, the lower extension <NUM> is rotatably attached to the lower frame portion <NUM> of the stroller <NUM> so as to be rotatable with respect thereto in the direction of arrows <NUM>, <NUM> (see, e.g., <FIG> and <FIG>).

The lower extension <NUM> includes one or more secondary connector components <NUM>. With reference to <FIG>, exemplary stroller <NUM> includes a pair of secondary connector components <NUM>.

The secondary connector components <NUM> are adapted to support a secondary seat <NUM> in selectively releasable attachment therewith (see, e.g., <FIG>). That is, the secondary connector components <NUM> are designed to cooperatively attach the secondary seat <NUM> to the frame, while also permitting the secondary seat <NUM> to be quickly and easily detached without the need for any special tools or time-consuming procedures. In this way, the secondary seat <NUM> can be attached and detached from the stroller <NUM> as desired.

In <FIG>, the secondary seat <NUM> is illustrated as being releasably attached to the secondary connector components <NUM> such that the secondary seat <NUM> faces forward (i.e., such that an occupant of the primary seat would face away from a user pushing the stroller). It is to be understood, however, that the secondary connector components <NUM> may be designed such that the secondary seat <NUM> may be reversibly attached to the secondary connector components <NUM> in either a forward-facing orientation (<FIG>) or rear-facing orientation in which the user pushing the stroller would face the occupant of the secondary seat.

In <FIG>, lower extension <NUM> is illustrated in the folded position. As will be explained in greater detail herein, the lower extension <NUM> may be positioned such that it lies directly adjacent and substantially parallel to the first and second side struts <NUM>, <NUM> of the lower frame portion <NUM> of the stroller <NUM> (i.e., in the direction of arrows <NUM>, <NUM>). As a result, each of the secondary connector components <NUM> may likewise be positioned directly adjacent and along respective ones of the first and second side struts <NUM>, <NUM> of the lower frame portion <NUM> of the stroller <NUM>.

Exemplary stroller <NUM> is illustrated in <FIG> with the primary connector components <NUM> in the lowermost position and the lower extension <NUM> in the folded position. Such a configuration is referred to herein as a single seat configuration. In the single seat configuration, the stroller may be adapted to receive only a primary seat <NUM> in selectively releasable attachment to the primary connector components <NUM>. Again, the lower extension <NUM> may be folded so as to not spatially interfere with the primary seat <NUM>, which may be positioned substantially centrally on the stroller frame. Alternatively, the lower extension may be selectively unfolded in the single seat configuration so as to provide additional space under the primary seat <NUM>, such as to increase the carrying capacity of a net or basket located under the primary seat.

With reference now to <FIG>, it may be seen that the primary connector components <NUM> have been slid along the upper frame portion <NUM> of the stroller (i.e., in the direction of arrow <NUM>) so as to selectively position the primary connector components <NUM> in an uppermost position along the upper frame portion <NUM> of the stroller <NUM>. Selective positioning of the primary connector components <NUM> in the uppermost position may position the primary seat <NUM> releasably attached thereto nearer to the upper end of the stroller than when the primary connector components <NUM> are in the lowermost position.

The distance between the primary connector components <NUM> and the secondary connector components <NUM> may be varied by sliding the primary connector components <NUM> between the uppermost position and the lowermost position. In particular, sliding the primary connector components <NUM> up the upper frame portion <NUM> of the stroller <NUM> (i.e., in the direction of arrow <NUM>) may increase the distance between the primary connector components <NUM> and the secondary connector components <NUM> as compared to when the primary connector components <NUM> are in the lowermost position. As a result, selective positioning of the primary connector components <NUM> in the uppermost position may be preferable when the stroller is desired to be used in a tandem seat configuration.

<FIG> illustrates the lower extension <NUM> in the unfolded or upward position. As will be explained in greater detail herein, the lower extension <NUM> may be positioned so as to be angled relative to the lower frame portion <NUM> of the stroller <NUM>. In this way, when the lower extension <NUM> is in the unfolded position, the secondary connector components <NUM> may be spaced longitudinally apart from the lower frame portion <NUM> and may be oriented upwardly (i.e., in the direction of arrow <NUM>).

Exemplary stroller <NUM> is illustrated in <FIG> with the primary connector components <NUM> in the uppermost position and the lower extension <NUM> in the unfolded position. Such a configuration is referred to herein as a tandem seat configuration. In the tandem seat configuration, the stroller may be adapted to receive both a primary seat <NUM> in selectively releasable attachment to the primary connector components <NUM> and a secondary seat <NUM> in selectively releasable attachment to the secondary connector components <NUM> of the lower extension <NUM>.

Exemplary stroller <NUM> is illustrated in <FIG> in the tandem seat configuration. In the tandem seat configuration, the primary connector components <NUM> may be selectively slid along the upper frame portion <NUM> of the stroller <NUM> so as to be in the uppermost position. The primary connector components <NUM> may receive a primary seat <NUM> in selectively releasable attachment therewith. The lower extension <NUM> may be selectively rotated relative to the lower frame portion <NUM> of the stroller <NUM> so as to be in the unfolded position. The secondary connector components <NUM> may receive a secondary seat <NUM> in selectively releasable attachment therewith. In this way, the primary connector components <NUM> may be positioned at least partially above (i.e., in the direction of arrow <NUM>) and at least partially rearward (i.e., in the direction of arrow <NUM>) of the secondary connector components <NUM>.

Exemplary stroller <NUM> illustrated in the accompany drawings includes a pair of (i.e., two) primary connector components <NUM> and a pair of (i.e., two) secondary connector components <NUM>, though it is to be understood that as few or as many primary and secondary connector components can be provided as desired. The number of primary and secondary connector components may generally correspond to the number of complementary mating components on the seats to be used with stroller <NUM>.

The primary and secondary connector components may be any suitable means for selectively releasably attaching the primary and secondary seats to the stroller frame. For example, the primary and secondary seats may each include its own mating components, which may be shaped complementary to respective ones of the primary and secondary connector components of the stroller. The primary and secondary connector components are preferably of the type that is non-releasably attached to the stroller frame or lower extension, respectively. Suitable primary and secondary connector components include, but are not limited to, locking tabs, friction fittings, rotating latches, magnetic components, or the like.

The primary and secondary seats may be of any desired size, shape, or configuration. That is, the primary and secondary connector components may be designed to accommodate selectively releasable attachment with an infant seat, toddler seat, baby seat, bassinet, pram, car seat, baby carrier, any other stroller seat, or the like.

As will be appreciated by those skilled in the art with reference to the accompanying drawings, the stroller may include other components or struts as are customary in the art, such as a basket, net, shade, peek-a-boo window, or parking brake.

With reference again to <FIG> and <FIG>, the lower frame portion <NUM> of the stroller <NUM> may include a first rear strut <NUM> and a second rear strut <NUM>. The first rear strut <NUM> may be foldably connected (e.g., pivotally or slidably connected) to one or both of the first side struts <NUM>, <NUM> of the upper and lower frame portions <NUM>, <NUM> (e.g., by first connection <NUM>). The second rear strut <NUM> may be foldably connected (e.g., pivotally or slidably connected) to one or both of the second side struts <NUM>, <NUM> of the upper and lower frame portions <NUM>, <NUM> (e.g., by second connection <NUM>). One or more crossbars <NUM>, <NUM> can interconnect the first and second rear struts <NUM>, <NUM>. One or more rear wheels <NUM> may be provided at the extreme ends of each of the first and second rear struts <NUM>, <NUM>.

With continued reference to <FIG> and <FIG>, a lower strut structure <NUM> may also be incorporated into an aspect of stroller <NUM>, such as for supporting a carrying basket beneath the seat(s) of the stroller. The lower strut structure <NUM> may, in certain embodiments, include a first lower strut <NUM> and a second lower strut <NUM>, one or more of which may be foldably connected (e.g., pivotally or slidably connected) to the lower frame portion <NUM> of the stroller <NUM>. The strut structure <NUM> may further include a crossbar <NUM> interconnecting the first lower strut <NUM> and the second lower strut <NUM>.

With reference now to <FIG>, a handle <NUM> may be provided proximate the first end <NUM> of the upper frame portion <NUM> of the stroller <NUM>. The handle <NUM> can be, for example, a telescoping handle. The handle <NUM> may, in certain embodiments, be foldably connected (e.g., pivotally or slidably connected) to the upper frame portion <NUM> of the stroller <NUM>. For example, as shown in <FIG>, the handle <NUM> may be foldably connected to the first side strut <NUM> of the upper frame portion <NUM> (e.g., by connection <NUM>) and may be foldably connected to the second side strut <NUM> of the upper frame portion <NUM> (e.g., by connection <NUM>).

<FIG> illustrate how the primary connector components <NUM> may be selectively slid along the upper frame portion <NUM> of the stroller <NUM> (i.e., in the direction of arrows <NUM>, <NUM>) so as to selectively position the primary connector components <NUM> in the uppermost or lowermost position.

Again, a pair of primary connector components <NUM> is illustrated. One (e.g., a first one of the illustrated pair) of the primary connector components <NUM> may be slidably attached to the first side strut <NUM> of the upper frame portion <NUM>. Another (e.g., a second one of the illustrated pair) of the primary connector components <NUM> may be slidably attached to the second side strut <NUM> of the upper frame portion <NUM>.

In certain constructions, each of the primary connector components <NUM> may preferably be non-releasably attached to the upper frame portion <NUM>. That is, one (e.g., a first one of the illustrated pair) of the primary connector components <NUM> may preferably be slidably and non-releasably attached to the first side strut <NUM> of the upper frame portion <NUM>, and another (e.g., a second one of the illustrated pair) of the primary connector components <NUM> may preferably be slidably and non-releasably attached to the second side strut <NUM> of the upper frame portion <NUM>.

In <FIG>, the primary connector components <NUM> are selectively positioned in the lowermost position with the primary seat <NUM> releasably attached thereto. In the lowermost position, the primary connector components <NUM> may be located proximate a forward end <NUM> of the upper frame portion <NUM>. In this way, <FIG> shows the upper frame portion <NUM> of the stroller in the single seat configuration.

The primary connector components <NUM> are designed so as to be slidable relative to the upper frame portion <NUM>. In particular, the primary connector components <NUM> may be slidable toward a rear end <NUM> of the upper frame portion <NUM> (i.e., in the direction of arrow <NUM>) as desired. Similarly, the primary connector components <NUM> may be slidable toward the forward end <NUM> of the upper frame portion <NUM> (i.e., in the direction of arrow <NUM>) as desired.

When the primary seat <NUM> is attached to the primary connector components <NUM>, such as is illustrated in <FIG> and <FIG>, movement of the primary connector components <NUM> relative to the upper frame portion <NUM> may be prevented or retarded. Limiting or preventing movement of the primary connector components <NUM> relative to the upper frame portion <NUM> when the primary seat <NUM> is attached to the primary connector components <NUM> may thereby prevent or retard undesired movement of the primary seat <NUM> and any occupant therein, such as by another occupant of the stroller. This may aid in ensuring the safety of an occupant or any items placed in the primary seat by limiting or preventing the primary seat from undesired movement relative to the upper frame portion <NUM>.

Put another way, the stroller may be designed, adapted, or configured such that movement of the primary connector components <NUM> relative to the upper frame portion <NUM> can only be effected when no seat is attached thereto. For purposes of further clarification, due to the attachment of the primary seat <NUM> to the primary connector components <NUM> in <FIG>, movement of the primary connector components <NUM> may not be possible in <FIG>.

In <FIG>, the primary seat <NUM> has been selectively detached from the primary connector components <NUM>, which remain selectively positioned in the lowermost position. As explained above, with the primary seat <NUM> selectively detached, the primary connector components <NUM> may now be slid along the upper frame portion <NUM> from the lowermost position to the uppermost position (i.e., in the direction of arrow <NUM>).

In <FIG>, the primary connector components <NUM> have been slid along the upper frame portion <NUM> (i.e., in the direction of arrow <NUM>) and are now selectively positioned in the uppermost position. In the uppermost position, the primary connector components <NUM> may be located further from the forward end <NUM> and closer to the rear end <NUM> of the upper frame portion <NUM> than when in the lowermost position (compare <FIG> and <FIG>). Put another way, in the uppermost position, the primary connector components <NUM> may be located between the forward end <NUM> and the rear end <NUM> of the upper frame portion <NUM>. In <FIG>, the primary seat <NUM> remains detached and is now positioned above the primary connector components <NUM> and is ready for attachment thereto.

In <FIG>, the primary seat <NUM> has been selectively reattached to the primary connector components <NUM>, which remain selectively positioned in the uppermost position. In this way, <FIG> shows the upper frame portion <NUM> of the stroller in the tandem seat configuration.

As explained above, with the primary seat <NUM> selectively attached to the primary connector components <NUM>, movement of the primary connector components <NUM> relative to the upper frame portion <NUM> may be prevented or retarded. For purposes of further clarification, due to the attachment of the primary seat <NUM> to the primary connector components <NUM> in <FIG>, movement of the primary connector components <NUM> may not be possible in <FIG>.

<FIG> and <FIG> illustrate the mechanisms that may effectuate movement of the primary connector components <NUM> relative to the upper frame portion <NUM>. For purposes of clarity, only the workings of the first side strut <NUM> of the upper frame portion <NUM> and of the primary connector component <NUM> attached thereto are labeled or described. However, it is to be understood that each of the first and second side struts <NUM>, <NUM> of the upper frame portion may be similarly designed. Likewise, it is to be understood that each of the primary connector components <NUM> may be similarly designed.

Each side strut of the upper frame portion <NUM> may include a track <NUM> running therealong (i.e., in the direction of arrows <NUM>, <NUM>) between the lowermost and uppermost positions. The primary connector components <NUM> may be designed so as to cooperative engage with respective ones of the tracks <NUM>. In particular, the primary connector components <NUM> may be adapted for sliding movement along the tracks <NUM>. Each track <NUM> may include one or more stops <NUM>. Generally, each track <NUM> may include at least two stops <NUM>, with one stop corresponding to the lowermost position and another stop corresponding to the uppermost position. The stops <NUM> can, for example, be designed as notches in the track <NUM>.

As a primary connector component <NUM> is slid along a respective track <NUM>, an engagement tab <NUM> of the primary connector component <NUM> may cooperatively engage with one of the stops <NUM> in the track. In this way, the engagement tab <NUM> of the primary connector component <NUM> may selectively lock the primary connector component <NUM> into one of the lowermost and uppermost positions. In particular, downward compressive force on the engagement tab <NUM> may be adapted to effect movement of at least a portion of the engagement tab <NUM> into a desired one of the stops <NUM> in the track <NUM> so as to cause the primary connector component <NUM> to be selectively positioned at a desired one of the uppermost and lowermost positions. For example, <FIG> shows the primary connector component <NUM> attached to first side strut <NUM> engaging with the track <NUM> thereof so as to selectively position the primary connector component <NUM> in the uppermost position.

Each primary connector component <NUM> may further be provided with a button <NUM>. The button <NUM> may be cooperatively connected to a locking tab 138a designed to keep the primary connector component <NUM> in attachment with a primary seat <NUM> placed upon the primary connector component <NUM> (see, e.g., <FIG>). For example, downward compressive force on the button <NUM> may be adapted to effect inward compressive movement of the locking tab 138a, so as to cause a primary seat <NUM> attached to the primary connector component <NUM> to be selectively detached therefrom.

As previously explained, preventing or retarding movement of the primary connector components <NUM> when the primary seat <NUM> is attached thereto may aid in ensuring that an occupant of the primary seat remains safe and is not undesirably moved. In particular, the primary connector components <NUM> may be designed, adapted, or configured such that movement of the primary connector components <NUM> relative to the upper frame portion <NUM> can only be effected when no seat is attached thereto. For example, the button <NUM> may be designed such that, when compressed (e.g., when a seat is attached to the primary connector component <NUM>), the primary connector component <NUM> is prevented from being moved. Compression of the button <NUM> may, for example, prevent the engagement tab <NUM> from being depressed, rotated, or otherwise disengaged, which may be necessary to effect sliding movement of the primary connector component <NUM> relative to the upper frame portion <NUM>.

<FIG> illustrate how the lower extension <NUM> may be selectively rotated relative to the lower frame portion <NUM> of the stroller <NUM> (i.e., in the direction of arrows <NUM>, <NUM>) so as to selectively position the lower extension <NUM> in the folded or unfolded position.

The lower extension <NUM> may include a first support member <NUM> and a second support member <NUM>. The first support member <NUM> may be rotatably attached to the first side strut <NUM> of the lower frame portion <NUM>. The second support member <NUM> may be rotatably attached to the second side strut <NUM> of the lower frame portion <NUM>. The first and second support members <NUM>, <NUM> may be rotatably attached to the first and second side struts <NUM>, <NUM> of the lower frame portion <NUM>, respectively, between the upper and lower ends <NUM>, <NUM> of the lower frame portion <NUM>. In particular embodiments, the first and second support members <NUM>, <NUM> may be rotatably attached to the first and second side struts <NUM>, <NUM> of the lower frame portion <NUM>, respectively, closer to the lower end <NUM> of the lower frame portion <NUM> than to the upper end <NUM> thereof, such as is illustrated in <FIG>.

In certain constructions, the lower extension <NUM> may preferably be non-releasably attached to the lower frame portion <NUM>. That is, the first support member <NUM> of the lower extension <NUM> may preferably be rotatably and non-releasably attached to the first side strut <NUM> of the lower frame portion <NUM>, and the second support member <NUM> of the lower extension <NUM> may preferably be rotatably and non-releasably attached to the second side strut <NUM> of the lower frame portion <NUM>. In certain constructions, the lower extension <NUM> (and each of the secondary connector components <NUM>) may rotatable about an axis perpendicular to the first and second side struts <NUM>, <NUM> of the lower frame portion <NUM>.

The lower extension <NUM> may further include a crossbar <NUM> running between and interconnecting the first side strut <NUM> and the second side strut <NUM>. That is, the lower extension <NUM> may be substantially U-shaped.

Again, the lower extension <NUM> includes a pair of secondary connector components <NUM>. One (e.g., a first one of the illustrated pair) of the secondary connector components <NUM> may be located at a distal end of the first support member <NUM> of the lower extension <NUM>. Another (e.g., a second one of the illustrated pair) of the secondary connector components <NUM> may be located at a distal end of the second support member <NUM> of the lower extension <NUM>.

In <FIG> and <FIG>, the lower extension <NUM> is selectively positioned in the folded position. In the folded position, the lower extension <NUM> may be positioned so as to lie directly adjacent and substantially parallel to the first and second side struts <NUM>, <NUM> of the lower frame portion <NUM> of the stroller <NUM> (i.e., in the direction of arrows <NUM>, <NUM>). As a result, each of the secondary connector components <NUM> may likewise be positioned directly adjacent and along respective ones of the first and second side struts <NUM>, <NUM> of the lower frame portion <NUM> of the stroller <NUM>. In this way, <FIG> and <FIG> show the lower frame portion <NUM> of the stroller in the single seat configuration.

One or more front wheels <NUM> may be provided at the extreme end of each of the first and second side struts <NUM>, <NUM> of the lower frame portion <NUM> of the stroller <NUM> (e.g., proximate the forward end <NUM> of the lower frame portion <NUM>), such as is illustrated in <FIG>.

In <FIG> and <FIG>, the lower extension <NUM> is selectively positioned in the unfolded or upward position. In the unfolded position, the lower extension <NUM> may be positioned so as to be angled relative to the lower frame portion <NUM> of the stroller <NUM>. As a result, each of the secondary connector components <NUM> may be positioned so as to be longitudinally spaced apart from the lower frame portion <NUM> of the stroller <NUM> and oriented upwardly (i.e., in the direction of arrow <NUM>). In this way, <FIG> and <FIG> show the lower frame portion <NUM> of the stroller in the tandem seat configuration. That is, the secondary connector components <NUM> are ready to receive a secondary seat in selectively releasable attachment therewith (see <FIG>, which illustrates secondary seat <NUM> in selectively releasable attachment with the secondary connector components <NUM>).

<FIG> and <FIG> illustrate the mechanisms that may effectuate movement of the lower extension <NUM> relative to the lower frame portion <NUM>. For purposes of clarity, only the workings of the first side strut <NUM> of the lower frame portion <NUM> and of the first support member <NUM> of the lower extension <NUM> attached thereto are labeled or described. However, it is to be understood that each of the first and second side struts <NUM>, <NUM> of the lower frame portion may be similarly designed. Likewise, it is to be understood that each of the first and second support members <NUM>, <NUM> may be similarly designed. Further yet, it is to be understood that each of the secondary connector components <NUM> may be similarly designed.

Each side strut of the lower frame portion <NUM> may include a rotational mechanism <NUM> attached thereto. The lower extension <NUM> may be designed so as to cooperatively engage with the rotational mechanisms <NUM>. In particular, the lower extension <NUM> may be adapted for rotational movement relative to the rotational mechanism <NUM>. Each rotational mechanism <NUM> may include a slotted groove <NUM>.

As the lower extension <NUM> is rotated relative to the lower frame portion <NUM>, engagement mechanisms <NUM> attached to the lower extension <NUM> may cooperatively engage with the grooves <NUM> in the rotational mechanisms <NUM>. In this way, the engagement mechanisms <NUM> of the lower extension <NUM> may selectively position and lock the lower extension <NUM> into one of the folded and unfolded positions. For example, to rotate the lower extension from the folded position to the unfolded position, downward force (i.e., in the direction of arrow <NUM>) on the crossbar <NUM> of the lower extension <NUM> may effect movement of the lower extension <NUM> and cause the lower extension <NUM> to rotate upwardly (i.e., in the direction of arrow <NUM>) to the unfolded position. Similarly, to rotate the lower extension back into the folded position, upward force (i.e., in the direction of arrow <NUM>) on the crossbar <NUM> of the lower extension <NUM> may effect movement of the lower extension <NUM> and cause the lower extension <NUM> to rotate downwardly (i.e., in the direction of arrow <NUM>) to the folded position.

A button <NUM> may be provided on the lower extension <NUM>. The button <NUM> may, for example, be adapted to permit rotation of the lower extension <NUM> relative to the lower frame portion <NUM>. The button <NUM> may be cooperatively connected to the engagement tab <NUM>. For example, downward compressive force on the button <NUM> may be adapted to cause the lower extension <NUM> to be permitted to rotate.

<FIG> illustrate a second exemplary embodiment lower extension <NUM>'. In this exemplary embodiment, the lower extension <NUM>' is generally comprised of an independent pair of secondary connector components <NUM>'. Again, the lower extension <NUM>' (i.e., each of the secondary connector components <NUM>') may be selectively rotated relative to the lower frame portion <NUM> of the stroller <NUM> (i.e., in the direction of arrows <NUM>, <NUM>) so as to selectively position the lower extension <NUM>' in the folded or unfolded position. Of note, in comparison to the secondary connector components <NUM> of lower extension <NUM> depicted in <FIG>, each of the secondary connector components <NUM>' of lower extension <NUM>' depicted in <FIG> are independent (i.e., not connected to one another) and individually rotatable with respect to a corresponding one of the first and second side struts <NUM>, <NUM> of the lower frame portion <NUM>.

In certain constructions, the lower extension <NUM>' (i.e., each of the individual secondary connector components <NUM>') may preferably be non-releasably attached to the lower frame portion <NUM>. In this embodiment, one (e.g., a first one of the illustrated pair) of the secondary connector components <NUM>' may be rotatably and non-releasably attached directly to the first side strut <NUM> of the lower frame portion <NUM>. Another (e.g., a second one of the illustrated pair) of the secondary connector components <NUM>' may be rotatably and non-releasably attached directly to the first side strut <NUM> of the lower frame portion <NUM>. In the embodiment depicted in <FIG>, each of the secondary connector components <NUM>' is rotatable or foldable about an axis parallel to the first and second side struts <NUM>, <NUM> of the lower frame portion <NUM>. Nonetheless, though not depicted, it is also specifically contemplated that each of the secondary connector components may be rotatable or foldable about an axis perpendicular to the first and second side struts of the lower frame portion.

In <FIG>, the lower extension <NUM>' (i.e., each of the individual secondary connector components <NUM>') is selectively positioned in the folded position. In the folded position, each of the secondary connector components <NUM>' is rotated or folded such that they are oriented downwardly. In this way, <FIG> shows the lower frame portion <NUM> of the stroller in the single seat configuration.

In <FIG> and <FIG>, the lower extension <NUM>' (i.e., each of the individual secondary connector components <NUM>') is selectively positioned in the unfolded or upward position. In the unfolded position, each of the secondary connector components <NUM>' may be oriented upwardly (i.e., in the direction of arrow <NUM>). In this way, <FIG> and <FIG> show the lower frame portion <NUM> of the stroller in the tandem seat configuration. That is, the secondary connector components <NUM> are ready to receive a secondary seat in selectively releasable attachment therewith.

Claim 1:
A stroller (<NUM>), comprising:
an upper frame portion (<NUM>) including first (<NUM>, <NUM>) and second (<NUM>, <NUM>) side struts spaced apart from each other;
a lower frame portion (<NUM>) including first (<NUM>, <NUM>) and second (<NUM>, <NUM>) side struts spaced apart from each other; and
a pair of primary connector components (<NUM>) adapted to support an associated primary seat in selectively releasable attachment therewith, each of the primary connector components (<NUM>) slidably attached to the upper frame portion (<NUM>).