Stroller system convertible into a bicycle seat

Description

Technical Field

[0001] The present invention relates to the general field of children's strollers. More specifically, it concerns an evolving stroller suitable for toddlers and older children, and convertible into a child's bicycle seat. Previous technique

[0002] Systems designed to facilitate the transport of children address a fundamental need for families. They fall into two main categories: toys (tricycles, scooters, bicycles, balance bikes, etc.) and childcare products (strollers, bicycle seats, carriers, etc.). The present invention falls into this second category, and more specifically into that of strollers and bicycle seats.

[0003] As the decarbonization of urban mobility accelerates in the face of climate change, active modes of mobility, and first and foremost cycling (classic or electric-assisted), are emerging as the key drivers of this evolution.

[0004] One of the challenges addressed by the present invention is overcoming the main obstacles encountered by parents wishing to transition from car to bicycle. These obstacles stem from the incompatibility between the need for a stroller and the use of a bicycle. This incompatibility manifests itself in various ways: the number of people involved in the child's daily life (parents, grandparents, caregivers, etc.) (not all of whom cycle), the diversity of times and places in the child's day (travel to and from home, daycare / school, park / playground, shopping, etc.), and the child's mobility and rest once they arrive at their destination.

[0005] This problem has already been studied and has led to various technical solutions such as stroller loading systems on a bicycle, strollers convertible into bicycles and hybrid bicycle / stroller seats.

[0006] However, in the current state of development, no proposed response has resulted in a fully satisfactory solution, particularly in terms of usage.

[0007] Indeed, systems for loading strollers onto a bicycle are generally difficult to use because their implementation is highly dependent on the respective designs of the two products to be assembled, in the absence of a standard mounting system. Furthermore, strollers were most often not designed with this in mind, so loading them can interfere with the proper use of the bicycle, its balance, etc.

[0008] As for bicycles that convert into strollers, they are generally very bulky, heavy, and expensive, and they don't satisfactorily fulfill the functions of either a stroller or a bicycle. These products are therefore additional items that add to the family's existing belongings, thus impacting their budget. Furthermore, they are difficult to maneuver and park, making them poorly suited to the needs of families living in apartments, in particular.

[0009] Hybrid bike seat / stroller solutions thus appear as a preferred option, and various solutions of this type have been developed. Examples include publications US 5 383 585 A, CN 214 057 767 U, NL 8 001 065 A, BE 1 014 981 A3, FR 2,659,616, GB 2,538,053, US 5,071,146, WO 01 / 66403 and WO 2016 / 003359, which describe different child bike seat systems that convert into strollers.

[0010] While these systems generally address the aforementioned problem, each has its drawbacks. For example, the system described in publication WO 2016 / 003359 does not allow for adjusting the backrest angle and, more generally, offers a seating structure typical of a bicycle seat, which does not fully meet the needs and uses of a stroller, especially for newborns. Furthermore, this system cannot be folded for storage. As for the stroller described in publication GB 2,538,053, it must be folded before being loaded onto the bicycle rack.

[0011] Generally speaking, existing solutions for bicycle seat systems that convert into strollers prove impractical in use. Furthermore, as these are childcare products, they do not always comply with the specific and numerous regulatory frameworks (different standards exist for strollers and bicycle seats). Description of the invention

[0012] The invention therefore relates to a stroller system that can be converted into a bicycle seat and does not present the aforementioned disadvantages.

[0013] According to the invention, this goal is achieved by means of a stroller system convertible into a bicycle seat, which can be configured in a first deployed configuration allowing its use as a stroller and in a second folded configuration allowing its storage and / or use as a bicycle seat. The stroller system comprises a rigid, foldable frame that can be attached to a bicycle rack in both a deployed and a folded configuration. The frame comprises: a seat structure with backrest, a set of directional front wheels pivotally mounted around a front transverse axis of the chassis between an extended and a folded position, a set of rear wheels pivotally mounted around a rear transverse axis of the chassis between an extended and a folded position, at least one locking device for the front wheels in its extended and folded positions, a removable attachment device for a bicycle rack, a pusher mounted on the chassis and whose length is adjustable between a high position in which it forms a handle for the stroller and a low position in which it forms a rear mechanical restraint for the backrest of the bicycle seat, and at least one locking and unlocking mechanism for the rear wheels positioned between the rear and front axles of the chassis,The mechanism is capable of cooperating with a stop element integral to the rear wheel assembly between a locked position in which it holds the rear wheel assembly in its deployed position and an unlocked position in which it allows the rear wheel assembly to pivot towards its folded position, the rear wheel assembly being held in its folded position by the front wheel assembly when the latter is locked in its folded position.

[0014] The stroller system according to the invention is remarkable in particular because it has two configurations: a first configuration when deployed and rolling, allowing its use as a stroller, and a second configuration when folded, allowing its storage and / or use as a bicycle seat. More specifically, the stroller system can be installed on the bicycle's luggage rack in either its folded or unfolded configuration and, consequently, can be folded or unfolded before or after loading or unloading the bicycle.

[0015] According to one embodiment, the locking and unlocking mechanism of the rear wheel assembly comprises a latch which is pivotally mounted on the chassis around a transverse axis located between the rear axis and the front axis and which has a front lug adapted to abut against a stop element integral with the front wheel assembly and a rear lug adapted to abut against the stop element integral with the rear wheel assembly, the latch being mounted on a spring adapted to pivot the latch around its axis in a direction opposite to the direction of pivoting of the front and rear wheel assemblies during their change of configuration,and the stop mechanism attached to the rear wheel assembly includes a retractable striker plate capable of moving between a first position in which it abuts against the rear lug of the latch to prevent the rear wheel assembly from pivoting, and a second position in which it can freely pass over the rear lug.

[0016] According to another embodiment, the locking and unlocking mechanism of the rear wheel assembly includes a cam rotationally fixed to the front wheel assembly and cooperating with a follower member which is mounted on one side of the chassis and which includes a front finger mounted on a spring to be held against the cam and a rear finger mounted on a spring, the rotation of the cam allowing the follower member to move between a first position in which the rear finger is against the stop member fixed to the rear wheel assembly to prevent the pivoting of the latter and a second position in which it releases the pivoting of the rear wheel assembly.

[0017] The front wheel assembly locking device may include at least one manually movable indexing pin between at least one locking position in which it fits into a chassis receptacle and an unlocking position in which it is retracted out of the chassis receptacle, the indexing pin being spring-mounted to maintain it in the locked position in the absence of manual action on it.

[0018] The front wheel assembly locking device may include two separate indexing pins that fit into two separate receptacles in the chassis when in the locked position.

[0019] According to another embodiment, the front wheel assembly locking device may include a lever controlled in rotation by the pusher between a locking position in which the lever allows a locking pin attached to the front wheel assembly to be blocked to prevent the pivoting of the latter, and an unlocking position in which the lever releases the locking pin to allow the pivoting of the front wheel assembly, the locking pin preventing the pivoting of the front wheel assembly by the action of a spring in the absence of action on the lever.

[0020] The front wheel assembly may include two arms at the ends of which at least one wheel is mounted and which are connected to each other only at their other end by the front transverse axle of the chassis so as to facilitate loading onto a bicycle carrier when the stroller system is in its deployed configuration.

[0021] Preferably, when moving from their deployed position to their folded position, the front and rear wheel assemblies pivot in the same direction of rotation towards the backrest of the seat structure.

[0022] Preferably, the stroller system also includes removable bicycle seat accessories that can be assembled onto the stroller system when it is used as a bicycle seat.

[0023] The stroller system may further include a front handle located at the front of the chassis and a rear handle located at the back of the seat structure, the front and rear handles allowing the stroller to be lifted manually when loading or unloading.

[0024] The front wheel assembly may include at least one retractable footrest system. Brief description of the drawings

[0025] [ Fig. 1 ] There figure 1 is a perspective view of a stroller system according to the invention in its deployed configuration. Fig. 2 ] There figure 2 is a perspective view of the stroller system of the figure 1 in its folded configuration. Fig. 3A-3B ] THE figures 3A et 3B are cross-sectional and top views of the stroller system chassis figures 1 And 2 showing the front wheel axle locking devices in its deployed and folded positions, respectively. Fig. 4A-4B ] THE figures 4A et 4B These are cross-sectional views of the stroller system chassis equipped with an alternative embodiment of the front wheel assembly locking and unlocking mechanism. Fig. 5A-5B ] THE figures 5A et 5B are cross-sectional views, respectively from above and from the side, of the stroller system chassis. figures 1 And 2 showing the rear wheel axle locking mechanism in its deployed position. Fig. 6A-6B ] THE figures 6A et 6B are cross-sectional views, respectively from above and from the side, of the stroller system chassis. figures 1 And 2 showing the rear wheel axle locking mechanism in its folded position. Fig. 7A-7B ] THE figures 7A et 7B are cross-sectional and side views of the chassis of a stroller system according to an embodiment of the invention showing a locking device for the front wheel assembly in its deployed and folded positions, respectively. Fig. 8A-8B ] THE figures 8A et 8B are cross-sectional views of the stroller system chassis equipped with a device for locking the front wheels in the folded position according to another embodiment. Fig. 9 ] There figure 9 is a view of the stroller system according to the invention in its folded configuration and equipped with removable bicycle seat accessories. Description of the implementation methods

[0026] The invention relates to an evolving stroller system of the type 1< and 2< age and convertible into a child's bicycle seat such as that shown in the figures 1 , 2 And 9 .

[0027] The stroller system 2 according to the invention can be manipulated between two configurations, namely a first configuration called "deployed" ( figure 1 ) allowing its use as a stroller, and according to a second configuration known as "folded" ( figure 2 ) allowing its storage and / or use as a bicycle seat.

[0028] The stroller system 2 includes a rigid folding chassis 4 suitable for being attached to a bicycle luggage rack (not shown in the figures) both when the stroller system is in its deployed configuration and in its folded configuration.

[0029] To this end, the chassis 4 includes a removable mounting device 6 for a bicycle luggage rack. Preferably (but not exclusively), this removable mounting device corresponds to the device described in patent application FR 2200378 filed by the Applicant on January 17, 2022, the contents of which are fully incorporated by reference. In this case, represented by the figure 7 The female plate 6a of the removable mounting device 6 is fixed under one of the lower faces of the frame and cooperates with the male plate 6b, which is fixed to the bicycle rack. Of course, other removable mounting devices can be considered.

[0030] The chassis 4 also includes a seat structure 8 with a reclining backrest 10, all covered with a cover having a protective hood against rain and sun (not shown in the figures).

[0031] A set of steerable front wheels 14 is pivotally mounted around a front transverse axis XX of the chassis between a deployed position ( figure 1 ) and a folded position ( figure 2 ). As described in detail later, the folding of the front wheel assembly is done towards the rear.

[0032] More specifically, the front wheel assembly comprises two front arms 16 at the end of which are mounted at least one wheel 18 and which are connected to each other only at their other end by the front transverse axle XX of the chassis.

[0033] In other words, this front wheel assembly lacks a bar connecting the front arms together at wheel 18, which makes it easier to load onto a bike rack when the stroller system is in its deployed configuration.

[0034] Furthermore, the front 16 arms of the front wheel assembly advantageously include at least one retractable footrest system.

[0035] As depicted on the figure 1 , the front wheel assembly may also include a system 21 for locking the wheels in rotation and for steering the wheels in the direction of travel.

[0036] The chassis 4 also includes a rear wheel assembly 20 which is pivotally mounted between a deployed position ( figure 1 ) and a folded position ( figure 2 ) around a rear transverse axis YY of the chassis. As described in detail later, the folding of the rear wheel assembly is done towards the rear and is subject to the prior unlocking of the front wheel assembly 14.

[0037] More precisely, the rear wheel assembly 20 comprises two rear arms 22 at the end of which at least one wheel 24 is mounted. The rear arms are connected, on the one hand, to each other at their end fitted with the wheels by a bar 26, and on the other hand to the chassis 4 at their end opposite the wheels at the level of the rear transverse axis YY of the chassis.

[0038] Advantageously, the rear wheel assembly 20 also includes a braking system which is actuated by means of a lever 28 mounted on the bar 26.

[0039] The stroller system according to the invention further includes a pusher 30 mounted on the chassis 6 and provided at an upper end with a handle 12 for holding and pushing the stroller system.

[0040] The length of the pusher 30 is adjustable (for example being telescopic) between a high position corresponding to the configuration deployed as a stroller and a low position corresponding to the configuration folded as a bicycle seat in which it forms a rear mechanical restraint for the back of the bicycle seat.

[0041] The stroller system according to the invention further includes a front handle (not shown in the figures) positioned at the front of the chassis, between the child's legs, and a rear handle 31 positioned at the rear of the seat back. These handles allow the stroller system to be carried, particularly when loading or unloading it from a bicycle rack.

[0042] The stroller system according to the invention further includes a device for locking the front wheel assembly in its deployed position and in its folded position.

[0043] In the embodiment shown in the figures 3A et 3B , the front wheel assembly locking device includes a main indexing pin 32 which is manually movable between two locking positions in which it fits into receptacles 34, 34' positioned on one side of the chassis 4 ( figures 3A et 3B ), and an unlocked position in which it is retracted out of the chassis receptacles.

[0044] More precisely, when it is in a first locking position ( Fig.3A The main indexing pin 32 is laterally housed in a first receptacle 34, which is positioned on one side of the chassis and extends along a transverse axis ZZ located in front of the front transverse axis XX of the chassis. This first locking position allows the front wheel assembly to be locked in its deployed position.

[0045] When it is in a second locking position ( Fig.3B The main indexing pin 32 is housed laterally in a second receptacle 34' which is positioned on the same side of the chassis and extends along a transverse axis Z'-Z' located between the front transverse axis XX and the rear transverse axis YY of the chassis. This second locking position allows the front wheel assembly to be locked in its folded position.

[0046] Furthermore, the main indexing pin 32 can be operated manually via a handle 36 and is mounted on a spring 38 to keep it in its locking positions when not manually operated.

[0047] In this embodiment, the front wheel assembly locking device includes an auxiliary indexing pin 40 which is also manually movable between two locking positions in which it fits into receptacles 42, 42' positioned on the opposite side of the chassis 4 ( figures 3A et 3B ), and an unlocked position in which it is retracted out of the chassis receptacle.

[0048] More specifically, when it is in a first locking position ( Fig.3A ) and corresponding to the first locking position of the main indexing pin 32, this auxiliary indexing pin 40 fits laterally into a first receptacle 42 which is aligned along the transverse axis ZZ of the chassis with the first receptacle 34.

[0049] Similarly, when it is in the second locking position ( Fig.3B ) and corresponding to the second locking position of the main indexing pin 32, this auxiliary indexing pin 40 fits laterally into a second receptacle 42' which is aligned along the transverse axis Z'-Z' of the chassis with the second receptacle 34'.

[0050] This auxiliary indexing pin 40 is mounted on a spring 44 to hold it in its locking positions when not manually operated. Furthermore, it can be operated from a handle 46 located on the same side of the chassis as the handle 36 for operating the main indexing pin 32. For this purpose, the auxiliary indexing pin 40 is connected to the handle 46 by means of a cable 48 passing through a tube 50 centered on the front transverse axis XX of the chassis.

[0051] Thus, in order to unlock the locking device of the front wheel assembly in order to move the front wheel assembly from its deployed position to its folded position (and vice versa), it will be necessary to manually pull at the same time on the two handles 36, 46 to retract the main indexing pins 32 and auxiliary 40 out of their respective receptacle.

[0052] The presence of two indexing pins (the main indexing pin and the auxiliary indexing pin) thus makes it possible to reinforce the security of the front wheel axle locking device by preventing any unintentional action on it.

[0053] Of course, it is possible to use only the main indexing pin. Similarly, in a configuration with two indexing pins, their respective operating handles can be positioned on either side of the chassis or combined into a single dual-action handle located on one side of the chassis.

[0054] In connection with the figures 4A et 4B , we will describe another embodiment of the locking and unlocking mechanism of the front wheel assembly.

[0055] In this alternative embodiment, the lower end 30a of the pusher 30 is capable of actuating the rotation of a lever 84 mounted for rotation on the frame. The rotation of the lever 84 allows a sheet metal 86, equipped with an opening, to be moved in translation between a locking position ( figure 4A ) - held in this position at rest by a spring 88 - and an unlocking position ( figure 4B ).

[0056] More specifically, the forward translation of sheet metal 86 (under the action of the pusher) allows its opening to be aligned with a locking pin 90 attached to the front wheel assembly to release the locking pin and thus allow the free rotation of the front wheel assembly ( figure 4B ).

[0057] When the push button 30 is deployed for use of the push-button system, the spring 88 re-engages the locking mechanism by sliding the plate 86 rearward. Since the locking mechanism is in the closed position at rest, the locking pin 90 is designed to be able to directly actuate the plate 86 only in the closing direction.

[0058] A safety device can be considered to prevent any unintentional unlocking of the mechanism. For example, a pin, like a cane pin (not shown in the diagrams). figures 4A, 4B ), positioned on one side of the pusher could act as a stop which must be actuated to allow the pusher to be fully depressed and to interact with the lever 84 by its lower end 30a.

[0059] The stroller system according to the invention further includes a locking and unlocking mechanism for the rear wheel assembly.

[0060] In connection with the figures 5A, 5B , 6A et 6B We will describe a first method of implementing such a mechanism.

[0061] In this embodiment, this mechanism includes in particular a cam 54 fixed in rotation to the front wheel assembly which is mounted on each side of the chassis 4 and which cooperates with a follower element 52 also mounted on each side of the chassis.

[0062] Each follower 52 includes a front finger 58 which is mounted on a spring 60 to be held against the cam 54 attached to the front wheel assembly.

[0063] Each follower 52 also includes a rear finger 62 which is mounted on another spring 64. The rotation of the cam 54 allows the follower 52 to move between a first position (corresponding to the spring 60 in the compressed position) in which the rear finger 62 comes to a butt against a stop member 56 integral with the rear wheel assembly (and formed by a plate) to prevent the latter from pivoting ( figures 5A et 5B ) and a second position in which it releases the pivoting of the rear wheel assembly ( figures 6A et 6B ).

[0064] The operation of this mechanism for locking and unlocking the rear wheel assembly is as follows.

[0065] In the deployed configuration of the stroller system, the front and rear wheel assemblies are in the deployed position ( figures 5A et 5B In this position, the follower 52 is positioned such that its rear finger 62 is abutted against the plate 56 attached to the rear wheel assembly. The rear wheel assembly therefore cannot pivot around the rear transverse axis YY to reach a folded position.

[0066] When the front wheel assembly begins to pivot rearward around the front transverse axis XX to come into the folded position, the front finger 58 of the follower will follow the cam track 54 attached to the front wheel assembly. This movement will result in a forward translation of the chassis of the follower 52, and therefore of the rear finger 62, which will retract and no longer come into contact with the plate 56 attached to the rear wheel assembly ( figures 6A et 6B ). The rear wheel assembly is thus unlocked and can then pivot towards the rear.

[0067] Preferably, the rear wheel assembly includes stop elements 63 which are suitable for butting against stop elements 65 of the front wheel assembly to enable the latter to drive the rear wheel assembly when the stroller system is moved from its deployed configuration to its folded configuration.

[0068] The front wheel assembly is then locked in its folded position by the front wheel assembly locking device described previously. As for maintaining the rear wheel assembly in its folded position, this is ensured by the front wheel assembly when it is locked in its folded position.

[0069] The transition of the stroller system from its folded to its unfolded configuration is accomplished as follows. First, the front wheel assembly is unlocked by means of the locking device and then pivoted forward. This action also drives the rear wheel assembly forward. During this movement, if the rear wheel assembly is obstructed during its rotation, the plate 56 attached to the rear wheel assembly presses against the rear finger 62 of the follower, causing the rear finger to retract to its second position. Once the plate 56 has passed the rear finger of the follower, the latter unfolds under the action of the spring 64 to its first position, locking the rear wheel assembly in its unfolded position. The front wheel assembly is locked in its unfolded position by the locking device described above.

[0070] In connection with the figures 7A et 7B , we will describe a second embodiment of the locking and unlocking mechanism of the rear wheel assembly.

[0071] In this second embodiment, it is planned to position on the two opposite sides of the chassis 4 a latch 66 which is able to pivot around a transverse axis Z'-Z' of the chassis, this axis Z'-Z' being located between the front axis XX and the rear axis YY and being parallel to the latter.

[0072] The latches 66 each have a front lug 68 which is able to come against a stop element 70 integral with the front wheel assembly and a rear lug 72 which is able to come against a stop element 74 integral with the rear wheel assembly,

[0073] In addition, each latch 66 is mounted on a spring 76 capable of pivoting the latch around its axis Z'-Z' in a direction opposite to the direction of pivoting of the front and rear wheel assemblies when they change configuration.

[0074] Furthermore, in this embodiment, the stop member attached to the rear wheel assembly is formed by a retractable strike plate 74 which is mounted on a spring 78 and which is able to move between a first position (corresponding to the spring 78 in the rest position) in which it comes to rest against the rear lug 72 of the latch 66 to prevent the pivoting of the rear wheel assembly 20 ( Fig.7A ) and a second position (corresponding to spring 78 in the compressed position) in which it can freely pass over the rear lug 72 ( Fig.7B ).

[0075] The operation of this mechanism for locking and unlocking the rear wheel assembly is as follows.

[0076] In the deployed configuration of the stroller system, the front and rear wheel assemblies are in the deployed position ( Fig.7A In this position, the latch 66 is held by the stop element 70, which is integral with the front wheel assembly, in such a position that its rear lug 72 abuts against the retractable strike plate 74 of the rear wheel assembly. The rear wheel assembly therefore cannot pivot around the rear transverse axis YY to reach the folded position.

[0077] When the front wheel assembly begins to pivot rearward around the front transverse axis XX to reach the folded position, the stop element 70 will pivot simultaneously with the front wheel assembly, thus allowing the latch 66 to pivot in the opposite direction around the axis Z'-Z' (under the effect of the spring 76). This pivoting of the latch will cause its rear lug 72 to pivot, which will release the rear wheel assembly from rotation. The rear wheel assembly is thus unlocked and can then pivot rearward ( Fig.6B ), the rest of the movement being identical to what has been described in connection with the previous embodiment of the locking and unlocking mechanism of the rear wheel assembly.

[0078] The stroller system transitions from its folded to its unfolded position as follows. First, the front wheelset is unlocked using the locking mechanism and then pivoted forward. This action also rotates the rear wheelset forward. During this movement, if the rear wheelset encounters an obstacle while rotating, the retractable latch 74, attached to the rear wheelset, presses against the rear lug 72 of the latch 66, causing the latch to retract to its second position. Once the retractable latch has passed the rear lug of the latch, it extends under the action of the spring 78 to its first position, locking the rear wheelset in its unfolded position. The front wheelset is locked in its unfolded position by the locking mechanism described above.

[0079] We will now describe various advantageous characteristics of the stroller system according to the invention in its different embodiments.

[0080] In connection with the figures 8A et 8B We will now describe another locking device for the front wheel assembly in the folded position. This locking device is an evolution of the locking and unlocking mechanism for the rear wheel assembly according to the first embodiment (relating to the figures 5A , B, 6A and 6B).

[0081] In this embodiment, the cam 54, which is integral with the front wheel assembly, includes a rear finger 94 positioned opposite the cam head. This rear finger 94 protrudes from the opposite side of the tube 50 through which the front transverse axle XX of the chassis passes. The face of this rear finger that first comes into contact with the follower 52 during a counterclockwise rotation is beveled.

[0082] Furthermore, the follower 52 includes, at its front finger 58, a machined head whose shape incorporates a first recess 52a made on the front face and a second recess (not shown in the figures) made on one side. The first recess 52a has a shape complementary to that of the rear finger 94 of the cam with which it cooperates.

[0083] During the rotation of the front wheel assembly from the deployed to the folded position, the spring 60 pushes the follower 52 forwards. This then remains in contact with the cam head 54, and then with the tube 50. As the rotation nears its end, the rear finger 94 of the cam in turn comes into contact with the front finger 58 of the follower by its beveled face.

[0084] The shape of the rear finger 94 is such that the rotation of the tube 50 exerts a force inducing the translation of the front finger 58 of the follower against the force of the spring 60. Once it has passed and aligned with the first recess 52a of the front finger 58 of the follower, the latter translates forward under the effect of the spring 60, thus blocking the rotation of the cam 54, and consequently any rotation of the front wheel assembly. The latter is thus locked in the folded position.

[0085] The locking device for the front wheel assembly in the folded position as described above is normally closed and cannot be unlocked without external action on the front finger 58 of the follower member so as to force its translation towards the rear against the force exerted by the spring 60.

[0086] This action is performed using a release lever (not shown in the figures) which is positioned on the side of the device implementing the follower member 52 in order to be made accessible to the user.

[0087] Such a release lever is rotatable and comprises a hand-operated handle at one end and an interaction rod at the opposite end, each end being located on either side of the axis of rotation of the release lever. The interaction rod is complementary to the second recess formed on one side of the front finger 58 of the follower.

[0088] The user's action on the release lever induces a force on the front finger 58 of the follower that opposes the force of the spring 60. This results in a rearward translation of the follower. This movement then releases the rear finger 94 from the cam and allows rotation of both the tube 50 and the front arm 16 of the front wheel assembly.

[0089] As depicted on the figure 9 Advantageously, the stroller system 2 further includes removable bicycle seat accessories which are suitable for assembly on the removable fixing device, in particular on the male plate of the device when the latter conforms to the device described in patent application FR 2200378.

[0090] For example, these accessories are two side plates 80 which serve to protect the child's legs from the spokes of the rear wheel of the bicycle and allow the attachment of removable and retractable footrests 82.

Claims

1. A stroller system (2) convertible into a bicycle seat able to be configured in a first deployed configuration allowing its use as a stroller and in a second folded configuration allowing its storage and / or its use as a bicycle seat, the stroller system comprising a rigid foldable chassis (4) able to be fixed to a bicycle luggage rack both in a deployed configuration and a folded configuration, the chassis comprising: - a seat base structure (8) with a backrest (10), - a set of steerable front wheels (14) pivotally mounted about a front transverse axis (X-X) of the chassis between a deployed position and a folded position, - a set of rear wheels (20) pivotally mounted about a rear transverse axis (Y-Y) of the chassis between a deployed position and a folded position, - at least one device for locking the front wheel set in its deployed position and in its folded position, - a removable fixing device (6) on a bicycle luggage rack, - a pusher (30) mounted on the chassis and whose length is adjustable between a high position in which it forms a handle (12) for the stroller and a low position in which it forms a rear mechanical retainer for the backrest of the bicycle seat, and - at least one mechanism for locking and unlocking the rear wheel set positioned between the rear axis (Y-Y) and the front axis (X-X) of the chassis, the mechanism being able to cooperate with a stop member (56; 74) secured to the rear wheel set between a locking position in which it maintains the rear wheel set in its deployed position and an unlocking position in which it allows the rear wheel set to pivot towards its folded position, the rear wheel set being maintained in its folded position by the front wheel set when the latter is locked in its folded position.

2. The stroller system according to claim 1, wherein: - the rear wheel set locking and unlocking mechanism comprises a latch (66) which is pivotally mounted on the chassis about a transverse axis (Z-Z') located between the front axis (X-X) and the rear axis (Y-Y) and which includes a front lug (68) able to come into abutment against a stop element (70) secured to the front wheel set and a rear lug (72) able to come into abutment against the stop member secured to the rear wheel set, the latch (66) being mounted on a spring (76) able to pivot the latch about its axis (Z-Z') in a direction opposite to the direction of pivoting of the front and rear wheel sets when their configuration changes, and - the stop member secured to the rear wheel set comprises a retractable strike (74) able to move between a first position in which it comes into abutment against the rear lug of the latch to prevent the rear wheel set from pivoting and a second position in which it can freely pass over the rear lug (72).

3. The stroller system according to claim 1, wherein the rear wheel set locking and unlocking mechanism comprises a cam (54) secured in rotation to the front wheel set and cooperating with a follower member (52) which is mounted on one side of the chassis and which comprises a front finger (58) mounted on a spring (60) to be maintained in abutment against the cam and a rear finger (62) mounted on a spring (64), the rotation of the cam allowing the follower member to move between a first position in which the rear finger is in abutment against the stop member (56) secured to the rear wheel set in order to prevent the latter from pivoting and a second position in which it releases the pivoting of the rear wheel set.

4. The stroller system according to any one of claims 1 to 3, wherein the front wheel set locking device comprises at least one indexing peg (32, 40) manually movable between at least one locking position in which it is housed in a receptacle (34, 34', 42, 42') of the chassis and an unlocking position in which it is retracted out of the receptacle of the chassis, the indexing peg being mounted on a spring (38, 44) in order to maintain it in the locking position in the absence of manual action on it.

5. The stroller system according to claim 4, wherein the front wheel set locking device comprises two separate indexing pegs (32, 40) housed in two separate receptacles of the chassis when they are in the locking position.

6. The stroller system according to any one of claims 1 to 3, wherein the front wheel set locking device comprises a lever (84) controlled in rotation by the pusher (30) between a locking position in which the lever makes it possible to block a locking bolt (90) secured to the front wheel set in order to prevent the latter from pivoting, and an unlocking position in which the lever releases the locking bolt to allow the front wheel set to pivot, the locking bolt preventing the front wheel set from pivoting by the action of a spring (88) in the absence of action on the lever (84).

7. The stroller system according to any one of claims 1 to 6, wherein the rear wheel set comprises stop elements (63) able to come into abutment against stop elements (65) of the front wheel set to allow the latter to drive the rear wheel set when the stroller system moves from its deployed configuration to its folded configuration.

8. The stroller system according to any one of claims 1 to 7, wherein the front wheel set (14) comprises two arms (16) at the end of which at least one wheel (18) is mounted and which are connected to each other only at their other end by the front transverse axis (X-X) of the chassis so as to facilitate loading onto a bicycle rack when the stroller system is in its deployed configuration.

9. The stroller system according to any one of claims 1 to 8, wherein, when moving from their deployed position to their folded position, the front (14) and rear (20) wheel sets pivot in the same direction of rotation towards the backrest (10) of the seat base structure.

10. The stroller system according to any one of claims 1 to 9, further comprising removable bicycle seat accessories (80, 82).

11. The stroller system according to any one of claims 1 to 10, further comprising a front handle located at the front of the chassis and a rear handle located at the level of the backrest of the seat base structure, the front and rear handles making it possible to manually lift the stroller during its loading or unloading.

12. The stroller system according to any one of claims 1 to 11, wherein the front wheel set comprises at least one retractable footrest system.