Abstract: A buggy for transporting children has a frame and wheels that are rotably mounted relative to the frame to support the frame above a ground surface. A primary seat is operatively supported by the frame for supporting a first child. A secondary seat is operatively supported by the frame for supporting a second child. The buggy is convertible between an in use configuration for transporting children and a folded storage configuration, whether or not the secondary seat is attached. The secondary seat may be detachable. The secondary seat may be positioned at least partly behind and at least partly below the primary seat.

Abstract: A foldable rollator includes: a main support frame including two spaced-apart front support rods; a rear support frame including two spaced-apart rear support rods pivotally coupled to the front support rods, respectively; a plurality of wheels respectively installed on the main support frame and the rear support rods for rolling on the ground; an intermediate support frame coupled to the main support frame and the rear support frame, including a front support sub-frame pivotally coupled between the front support rods and a rear support sub-frame pivotally coupled between the rear support rods, the front and rear support sub-frames being further pivotally coupled to an axle; a seat unit disposed atop the intermediate support frame; and a backrest unit pivotally coupled to the axle.

Abstract: A foldable structure for baby strollers is revealed. The foldable structure includes two joints at each side thereof. A push rod, a front support with a sliding member and a rear support are pivotally connected to each joint. The sliding member is linked to the push rod and the rear support by an upper link and a lower link respectively. A quadrilateral linkage is arranged between the two front supports while a seat is pivotally connected to and located above the quadrilateral linkage. The quadrilateral linkage is linked to front wheel sets and the sliding members. Thereby the quadrilateral linkage is driven to move through the upper and the lower links and the sliding members when the joint is released from a locked state and the push rod is pushed forward. The front wheel sets are also folded. Thus the baby stroller is folded into a compact size.

Abstract: A collapsible pushchair is disclosed. It comprises a chassis (2) to which wheels (8, 9, 25, 26) are attached, a seat hanger (33) and a pair of spaced parallel tubular body portions (6,7) fixed relative to and extending upwardly at an angle from the chassis away from the wheels on opposite sides of said seat hanger. A first handle part (15) is received in each tubular body portion and is slideable between an extended position in which the first handle part (15) primarily extends from an upper end of the tubular body portion (6,7) towards a person pushing the pushchair and, a second stowed position in which the first handle part (15) has been slid through each tubular body portion (6,7) so that the first handle part extends from the upper end and a lower end of each of the tubular body portions. The seat hanger is pivotally attached to said first handle parts such that the seat hanger (33) folds as the first handle parts (15) are slid into their stowed position from their extended positions.

Abstract: The utility model provides a baby stroller capable of be folded with one hand, which comprises a comprise a joint seat, an upper joint, a lower joint, an annular pressing block, a lock device being used in the lower joint and the upper joint to avoid rotating among the lower joint, a folding device being used to control the lock device for locking or releasing the upper joint and the lower joint, wherein the folding device comprises a connecting seat, a lever, a wire and a lifting belt; the connecting seat is provided with first release components to control and lock the lever in case of movement. The present invention can fold the baby stroller by one hand, and the operation is very convenient, flexible, and effortless.

Abstract: The present invention relates to a device and assembly for transporting a child, such as a pram and/or buggy. According to the invention the pram comprises two wheel-bearing arms which are pivotally coupled by a coupling housing. One of these arms is pivotally connected to a connector element for coupling to for instance a child's seat. The pram further comprises a transmission between the connector element and the other arm for the purpose of rotating the connector element during said pivoting of the pram from the folded-open position to the collapsed position.

Abstract: The invention refers to a foldable chassis for a child's pushchair comprising an inverted “U” shaped handlebar, a front legs, a rear legs, a scissor frame and two side cross members that link the front feet to the rear, and a locking compass between the rear wheels, characterised by the fact that the arm of each side of the handlebar and its corresponding front leg form a continuous assembly, where the link between the front leg and its corresponding wheel is made by an articulated section, this section being in turn articulated to the front wheel support, which is able to reduce the length in the folded frame.

Abstract: A collapsible stroller comprising a frame and a reversible seat (5) comprising an armrest portion (5.5) is provided. The reversible seat (5) is mountable via an attachment point on the stroller frame in either a forward or rearward orientation with respect to the stroller frame, and in such a way that the attachment point can be moved relative to the stroller frame for collapse of the reversible seat (5) along with the stroller frame, irrespective of the reversible seat's orientation. An associated reversible seat structure is also disclosed.

Abstract: An infant carrier apparatus includes a support frame and a seat. The support frame includes at least one latch assembly, the latch assembly being operable between a locking state where the latch assembly locks the support frame in an unfolded state, and an unlocking state to allow folding of the support frame. The seat is operable to attach with and detach from the support frame, wherein the seat includes a driving part that is connectable with the latch assembly when the seat is installed on the support frame, and the driving part is operable to cause displacement of the latch assembly from the locking state to the unlocking state. In some embodiments, a method of operating the infant carrier apparatus is also described.

Abstract: A collapsible stroller, including a handle tube, a front leg tube with a front wheel assembly, a rear leg tube with a rear wheel assembly, a joint assembly connecting the handle tube to the front leg tube and the rear leg tube, and a reversible seat reversibly mounted on the joint assembly, characterized in that the reversible seat is provided with an engaging projection, and the joint assembly is provided with more than one engaging recess rotatable with a stroller frame, and that the stroller frame can be collapsed after the engaging projection of the reversible seat is inserted into the engaging recess, and the rotation of the stroller frame brings the reversible seat to rotate therewith, so that the reversible seat is collapsed along with the stroller frame.

Abstract: The invention relates to a seat attachment for a stroller, single stroller and double strollers. Such a seat attachment may be used to reversibly convert a single stroller into a double stroller. More specifically, versions of the seat attachment relate to a seat attachment for a stroller capable of supporting a seat such as, but not limited to, a stroller seat, a baby seat, bassinet, a pram, a car seat, or a baby carrier, for example. The seat may be supported in front of a permanent seat of the stroller.

Abstract: A stroller is provided which includes a right frame and a left frame. Each frame has a front support rotatably connected to a rear support at a frame joint. The front support of each frame is a telescoping tube assembly. The stroller further includes a linkage comprising at least two substantially rigid members connected between the right frame and the left frame, the rigid members being connected to the front supports at a right slideable joint and a left slidable joint. The joints are received within the slot of the outer tube. A drive mechanism coupled to the right or left frame is also provided. The front support and the rear support of the right frame and the left frame are movable from an open position to a closed position by the drive mechanism.

Abstract: A child carrier apparatus comprises first and second leg frames, a seat frame including first and second tube portions, a joint housing connected with the first and second tube portions, an impeding part assembled adjacent to the joint housing, and a release actuator. The first tube portion is pivotally connected with the first leg frame. The second tube portion is pivotally connected with the second leg frame and the joint housing, and is rotatable between unfolded and folded positions. The impeding part can move between a first position obstructing rotation of the second tube portion relative to the joint housing from the unfolded position, and a second position displaced away from a path of rotation of the second tube portion to allow folding of the second tube portion. The release actuator is operable to drive the impeding part to move from the first to second position.

Abstract: A foldable stroller has a frame assembly with a fold joint, a fold joint, a handle push arm, a front leg with an upper end connected to the fold joint, a rear leg extending down from and pivotally connected to the fold joint, and a drive link. The drive link has a rear end pivotally coupled to the rear leg below the fold joint and a front end pivotally coupled to a lower end of the push arm. The frame assembly is reconfigurable between an unfolded and a folded configuration. In the folded configuration, the fold joint moves upward along the handle push arm. The rear end of the drive link and the rear leg are moved toward and lie closely adjacent the front leg and handle push arm. The frame assembly may automatically move to the folded and/or unfolded configuration. The foldable stroller may also stand upright in the folded configuration.

Abstract: An infant stroller apparatus includes a rear leg frame including a first side segment, a handle having a second side segment formed by at least a first and a second tubular member telescopically assembled with each other, an impeding part assembled with the second side segment and operable to create an interference that blocks retraction of the second tubular member into the first tubular member, and an armrest pivotally connected with the second side segment and provided with an actuating member disposed adjacent to the impeding part. A rotation of the armrest in a direction for collapsing the infant stroller apparatus can cause a displacement of the actuating member, which drives the impeding part in movement to remove the interference and allow retraction of the second tubular member into the first tubular member.

Abstract: A child stroller and a stroller frame thereof are disclosed. The child stroller includes the stroller frame and a child safety seat. The child safety seat is engaged with the stroller frame in a detachable way. The stroller frame includes a main frame and an engaging device disposed on the main frame. The child safety seat includes a front engagement mechanism and a rear structural part. The front engagement mechanism is engaged with a front handrail support of the main frame. A hook of the engaging device hooks the rear structural part. Therefore, in practice, parents can take the child safety seat together with the child sitting thereon from a car onto the stroller frame, which reduces the probability of waking the child up and the inconvenience of the parents.

Abstract: A convertible tandem stroller frame is capable of locking in a tandem stroller mode for installing a second seat thereby concurrently transporting two occupants, and capable of converting said mode into a single seat mode for transporting single occupant by simply manipulating a release actuator at a front portion of the convertible tandem stroller frame. The convertible tandem stroller frame may include a front rack, a rear rack, at least a longitudinal telescopic mechanism and at least a locking mechanism. The front rack and the rear rack are lockably and adjustably connected by the longitudinal telescopic mechanism, so as to be extended into the tandem stroller mode and be retracted into the single seat mode. The locking mechanism is associated with the release actuator for locking and un-locking the longitudinal telescopic mechanism by manipulating in front of the convertible tandem stroller frame.

Abstract: A baby stroller for transporting a child is disclosed. This baby stroller has a folding mechanism to facilitate folding for easier stowing and transporting. The folding mechanism, a unique feature of the design is directed toward compactness, ease of use, reliability, and reduction in manufacturing costs.

Abstract: A stroller includes an outer frame unit, two support units connected with the outer frame unit, two linking units connected with the outer frame unit and the support units, a cross connection unit mounted between the support units and the linking units, and a positioning and folding unit mounted between the support units. Thus, the positioning and folding unit is operated to expand and collapse the stroller.

Abstract: A conveyance is described which is intended for transporting people, primarily babies and children, though can be adapted for transporting adults, including disabled and injured people and scaled down for use as a child's toy. Its construction places it primarily within the field of wheeled conveyances with capabilities allowing it to be multi-purpose. The invention seeks to combine the functions of the people transportation conveyance and a rucksack, which can be detachably built into the rear of the seating area to carry the weight of the conveyance and child. With the conveyance folded it is put onto the back of a person and carried with the rucksack available to carry other items. With the extrusions extended the conveyance can act as a “shopping trolley” style conveyance as a carrying aid. With the front wheels raised and the seat unfolded the conveyance can be carried on the back and used as a baby carrier.

Abstract: Maneuverable strollers are disclosed herein. An example stroller disclosed herein includes a frame having a front wheel and rear wheel to support the frame. An intermediate wheel is positioned between the front wheel and the rear wheel. A carriage is coupled to the rear wheel, the intermediate wheel and the frame.

Abstract: A convertible child carrier is provided comprising a pair of opposing central hub members having telescopic rear legs pivotally attached the hub members at a first end. Each of the legs has a pivotable wheel affixed to a second end. The child carrier further includes a yoke member generally defining an arch-like shape that is also pivotally attached to both of the pair of hub members. An additional wheel is affixed a central section of the yoke member. The child carrier further includes a handle member pivotally attached to each of the hub members, a seating portion disposed between the distal ends of the yoke member, and a storage portion affixed to the handle member defining an internal storage cavity. The rear legs, the yoke member, and the handle member each may pivot to a stowed configuration such that the storage portion encompasses the members within the storage cavity.

Abstract: A juvenile stroller includes a mobile base and a juvenile seat mounted on the mobile base. The mobile base includes wheels and a foldable frame carrying the juvenile seat.

Abstract: The present invention reveals a Single-Handedly Foldable Stroller that includes a Hand Tube, a Front Leg Tube, a Front Helm, a Rear Leg Tube, a Rear Helm, and 2 Joint Components. Said Joint Components connect the Hand Tube, the Front Leg Tube and the Rear Leg Tube with each other. Each said Joint Components includes an Upper Joint, a Lower Joint, a Sleeve, a Sleeve Limiting Pedestal and a Folding Operation Component. The Upper Joint is connected with the Hand Tube, and the Lower Joint is connected with the Front Leg Tube. One end of the Sleeve is inserted in the Sleeve Limiting Pedestal, while the other end is sleeved in the Rear Leg Tube. Moving the Sleeve through the Folding Operation Component would gradually turn the Upper Joint and the Lower Joint counter-clockwise, accomplishing the folding/expanding of the Stroller.

Abstract: A child stroller apparatus includes first and second leg frames, a handle and a latch element. The first leg frame includes a first side segment affixed with a first coupling element. The second leg frame includes a second side segment affixed with a second coupling element that is pivotally connected with the first coupling element about a first pivot axis. The handle includes a third side segment affixed with a third coupling element that is pivotally connected with the first coupling element about a second pivot axis. The latch element is operable to move between a locked position where the latch element locks the first, second and third coupling elements together to hold the handle and the first and second leg frames in a deployed state, and an unlocked position to allow relative rotations between the handle and the first and second leg frames to collapse the stroller apparatus.

Abstract: An infant stroller is provided. The infant stroller includes a frame having a frontward-facing seat for receiving an infant and a first wheel assembly at a frontward portion thereof for transport of the stroller and a support of the frame at a rearward portion thereof. A pair of wheel assembles is carried about opposing positions of the rearward portion of the frame. A handle assembly is detachable from the frame and defines spaced-apart handle portions that are configured for interconnecting with spaced-apart frame members. An enclosure area is defined by a cross-member that spans the spaced-apart frame members and by the spaced-apart handle portions of the handle. An athletic article container is carried on the support and extends through the enclosure area.

Abstract: An improved frame structure of a baby carriage is provided, including a handle, a connecting rod, a folding assembly, a support rod and a linkage rod assembly. The connecting rod has one end connected to the handle and the other one connected to the folding assembly. The folding assembly includes a first transmission rod and a second transmission rod. The first transmission rod has one end connected to the connecting rod and the other end connected to the support rod. The second transmission rod has one end connected to the first transmission rod and the other end connected to the linkage rod assembly. The improved frame structure is easy to use and portable.

Abstract: A stroller includes 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.

Abstract: A lockable walker and a lock for use with a walker the lock including a constricted, U-shaped clasping region, a projection and an abutment shoulder, with the constricted, U-shaped clasping region snap fitting over the front leg or rear leg of a walker and slidably movable along the front leg or rear leg of the walker, so that when the walker is folded up and the lock is moved upward toward a leg extension that forms an offset hinge or pivot connecting the front and rear legs of the walker, a projection member of the lock is inserted into an opening formed by the leg extension and walker legs to thereby locked the walker in a storage position so that the walker legs cannot spontaneously unfold.

Abstract: A convertible tandem stroller with a double seat transfer mechanism includes a wheeled rack, a pair of extension arms and a pair of chairs. The stroller is featured with the wheeled rack having a swivel mount, the pair of extension arms being connected to the swivel mount, and the pair of chairs being swivelly mounted on the pair of extension arms. The extension arms are capable of swiveling relative to the wheeled rack and positioning on a longitudinally oriented position and a transversely oriented position so as to convert the stroller from a tandem style to a side-by-side double seat style, and vice versa.

Abstract: A buggy for transporting children has a frame (3a, 3b, 5) and wheels (9) that are rotatably mounted relative to the frame to support the frame above a ground surface. A primary seat (8) is operatively supported by the frame for supporting a first child. A secondary seat (17) is operatively supported by the frame for supporting a second child. The buggy is convertible between an in use configuration for transporting children and a folded storage configuration, whether or not the secondary seat is attached. The secondary seat may be detachable. The secondary seat may be positioned at least partly behind and at least partly below the primary seat.

Abstract: A stroller includes: a frame part; a handle connected to the frame part so as to be swingable; caster mechanisms turnably holding wheels; and a switching mechanism including a switching member which is configured to be held on predetermined positions in accordance with the position of the handle. The caster mechanisms are provided with locking members configured to regulate turning of the wheels. In addition, there are provided transmission mechanism configured to operate the locking members in conjunction with a movement of the switching member.

Abstract: A collapsible stroller includes a collapsible seat-support frame and a frame lock coupled to the seat-support frame. The frame lock is operable by a caregiver to retain the seat-support frame in an erect configuration or release the seat-support frame so that it is free to move to a collapsed storage configuration.

Abstract: A basket device is used for a foldable stroller including front and rear support units. The rear support unit includes two rear support frames. The basket device includes two pivot members secured respectively to the rear support frames, two clamping members disposed respectively and rotatably on the pivot members, a curved frame, and a basket body made of a soft material. Each of the clamping members defines a passage. The curved frame has two opposite end portions extending respectively through the passages in the clamping members. The basket body has a front end fastened to the front support unit, and a rear end portion sleeved fixedly on the curved frame, such that the curved frame is generally horizontal.

Abstract: The invention relates to a seat attachment for a stroller, single stroller and double strollers. Such a seat attachment may be used to reversibly convert a single stroller into a double stroller. More specifically, versions of the seat attachment relate to a seat attachment for a stroller capable of supporting a seat such as, but not limited to, a stroller seat, a baby seat, bassinet, a pram, a car seat, or a baby carrier, for example. The seat may be supported in front of a permanent seat of the stroller.

Abstract: A foldable stroller frame includes: two opposite foldable side frame units; and a foldable middle support interconnecting the side frame units. Each of the side frame units includes a handle rod, a first leg pivoted to the handle rod and adapted to be connected to a first stroller wheel, a second leg pivoted to the first leg and adapted to be connected to a second stroller wheel, and a connecting slider mounted slidably on the second leg. The handle rod has a lower end portion pivoted to the connecting slider so as to be co-slidable with the connecting slider on the second leg.

Abstract: A twin baby carriage comprises a front bracket, a pair of rear brackets, and a linkage bar set. The front bracket includes a connection hub at a middle section. The front bracket includes a front stretcher extended between two sides thereof. The rear brackets include a rear stretcher extended between two outmost sides thereof. The linkage bar set includes an elongate bar, an upper slide sleeve and a lock control assembly. The elongate bar bridges the connection hub and front stretcher. The upper slide sleeve is coupled on the elongate bar. The lock control assembly is held in the upper slide sleeve and includes a control knob and a pin. The control knob is depressible to drive the pin to insert into a positioning hole on the elongate bar such that the upper slide sleeve and elongate bar are locked to form a fixing state.

Abstract: A juvenile stroller includes a mobile base and a juvenile seat mounted on the mobile base. The mobile base includes wheels and a foldable frame carrying the juvenile seat.

Abstract: A folding walker includes a first frame of two parallel main supports separated by a horizontal cross bar. An inverted U-shaped second frame has one leg pivotally affixed to each main support of the first frame and pivotal between an extended operable position and a folded storage position. At least one brace extends from an intermediate portion of a leg of the second frame and is pivotally affixed thereto, and an upper end of the brace is slidably attached to an upper portion of one of the main supports of the first frame. At least one tension brace extends between a lower portion of one of the main supports of the first frame and one of the legs of the inverted U-shaped second frame. The tension brace is intermediately hinged wherein a first segment of the tension brace is pivotal with respect to a second segment of the tension brace.

Abstract: A buggy for transporting children has a frame (3a, 3b, 5) and wheels (9) that are rotatably mounted relative to the frame to support the frame above a ground surface. A primary seat (8) is operatively supported by the frame for supporting a first child. A secondary seat (17) is operatively supported by the frame for supporting a second child. The buggy is convertible between an in use configuration for transporting children and a folded storage configuration, whether or not the secondary seat is attached. The secondary seat may be detachable. The secondary seat may be positioned at least partly behind and at least partly below the primary seat.

Abstract: A buggy for transporting children has a frame (3a, 3b, 5) and wheels (9) that are rotatably mounted relative to the frame to support the frame above a ground surface. A primary seat (8) is operatively supported by the frame for supporting a first child. A secondary seat (17) is operatively supported by the frame for supporting a second child. The buggy is convertible between an in use configuration for transporting children and a folded storage configuration, whether or not the secondary seat is attached. The secondary seat may be detachable. The secondary seat may be positioned at least partly behind and at least partly below the primary seat.

Abstract: A stroller apparatus can collapse in a compact and convenient manner. In some embodiments, the stroller apparatus can be provided with a mounting fixture capable of detachably fastening a child support accessory thereon. The mounting fixture affixed on the stroller frame can lock with a connector affixed on the child support accessory. The connector can be inserted into the mounting fixture for locking the child support accessory in position on the stroller frame. The connector can lock with the mounting fixture in either of a rearward and forward facing configuration of the child support accessory. In other embodiments, the stroller apparatus can include a child support that has a connector portion through which it is assembled with the stroller frame. The construction of the stroller frame is such that it can be conveniently collapsed in a compact form.

Abstract: A juvenile stroller includes a foldable frame, wheels coupled to the foldable frame, and a seat coupled to the foldable frame. The frame can be folded to assume a compact size and unfolded to position the seat relative to the wheels to transport a child sitting in the juvenile seat.

Abstract: A foldable adjustable dynamic wheelchair including a seat assembly and a push handle assembly configured to serve as a chair back frame both of which are pivotally connected to a mobility base having a pair of spaced apart front rear wheels and a front wheel. A pair of selector plates each having a pair of valleys at a bottom edge thereof are each mounted to either side of the mobility base. A foot operable actuator member is connected to an over-center assembly for moving a latch bar into a valley on one side of center and for moving the latch bar outside a valley on the other side of center. With the latch bar located in one valley the wheelchair is configured in an upright configuration and when the latch bar is located in the other valley, the wheelchair is configured in an extended position.

Abstract: A front wheel arrangement on a bicycle trailer is provided. The connecting hook is arranged to be rotated on the connecting axis that comprises a locking arrangement for locking the front wheel in an in-use position and in a rest position.

Abstract: A vehicle frame assembly (4) including a hinge device (16), the hinge device (16) having first and second hub devices (22) and a third hub device (22) interposed between the first and second hub devices (22), the first and second hub devices (22) releasably engage with the third hub device (24) for locking the vehicle frame assembly (4) in an erected condition, wherein the first and second hub devices (22) have inwardly-projecting lugs (26) about their periphery and the third hub device (24) includes at its periphery recesses (28), the recesses (28) and the inwardly-projecting lugs (26) arranged to loosely interdigitate in the erected condition, and wherein the inwardly-projecting lugs (26) comprise inwardly-projecting ramped portions and the third hub device (24) comprises, bounding the recesses (28), corresponding outwardly-projecting ramped surface portions (40).

Abstract: A foldable stroller includes two front legs, two rear legs, a basket frame, two seat-supporting tubes, two pivoting members, two connecting rods, and a backrest-supporting tube. Rotation of the basket frame and the seat-supporting tubes relative to each other about a pivot point results in rotation of the pivoting members relative to the connecting rods about another pivot point to thereby rotate the backrest-supporting tube and the basket frame toward the rear legs in different directions.

Abstract: A child carrier in accordance with the present disclosure is adapted to be mounted on a rolling stroller frame to hold a child for transport on the rolling stroller frame. In one mode, the child carrier is configured to provide a bassinet. In another mode, the child carrier is configured to provide a seat.

Abstract: The present invention discloses a stroller including a foldable stroller skeleton, a front-wheel assembly and a rear-wheel assembly installed on the foldable stroller skeleton, a frame pivotally connected to the foldable stroller skeleton and an assistant wheel pivotally connected to the frame for being capable of contacting a ground by cooperating with the rear-wheel assembly as the frame approaches the rear-wheel assembly by rendering the foldable stroller skeleton folded. The stroller can be in a standing state so as to facilitate users to carry after being folded. The assistant wheel is rolling as the stroller is dragged so that users can save more effort to drag the stroller. The stroller is standing by the assistant wheel and the rear-wheel assembly, instead of the front-wheel assembly and the rear-wheel assembly.

Abstract: A collapsible stroller has a collapsing operation in width and front/rear directions that can be performed simultaneously. The collapsible stroller has a frame including a pair of front leg tubes and a pair of rear leg tubes pivotally collapsibly coupled to the front legs; a seat unit including a pair of seat side-tubes and a pair of backrest tubes; a first collapsing auxiliary assembly horizontally collapsibly disposed between lateral sides of the frame and operably coupled to the side-tubes of the site unit and the rear leg tubes; a second collapsing auxiliary assembly disposed between the rear leg tubes; and an operation unit operably coupled to the side-tubes of the seat unit and releasibly coupled to the rear leg tubes of the frame, thereby the two dimensional collapsing operation of the stroller can be performed by one hand of the user.