CN212220352U - Baby carriage seat assembly and baby carriage - Google Patents

Abstract

The present disclosure relates to a stroller seat assembly and a stroller, wherein the seat assembly comprises: a seat part and a backrest part, the inclination angle of which relative to the seat part is adjustable; a armrest part which is rotatably arranged relative to the seat part; the joint assembly is used for connecting the backrest part, the armrest part and the seat part together and comprises a first locking and unlocking component, a second locking and unlocking component and an actuator, the first locking and unlocking component and the second locking and unlocking component are connected with the actuator, and the actuator and the backrest part rotate synchronously; the first operating piece is connected with the actuating piece through the force transmission piece and is configured to drive the actuating piece to move through the force transmission piece when the first operating piece moves to the first unlocking position so as to unlock the first locking and unlocking part through the movement of the actuating piece and allow the inclination angle of the backrest part relative to the seat part to be adjusted; and the actuating piece is driven to rotate in the process of the backrest part rotating and folding back towards the seat part, so that the second locking and unlocking component is unlocked through the rotation of the actuating piece, and the armrest part is allowed to rotate and fold back towards the seat part.

Description

Baby carriage seat assembly and baby carriage

Technical Field

The present disclosure relates to the field of child products, and more particularly, to a stroller seat assembly and a stroller.

Background

In order to improve riding comfort, the current baby carriage is provided with a structure with an adjustable backrest inclination angle, wherein the backrest is erected when a baby rides daily, and the backrest is adjusted backwards after the baby falls asleep. Furthermore, the stroller needs to be folded when it needs to be carried or stored. In order to realize the two functions, the current baby carriage needs to be designed with a complex mechanism and has larger operation difficulty.

SUMMERY OF THE UTILITY MODEL

Embodiments of the present disclosure provide a stroller seat assembly and a stroller, which can adjust and fold the seat assembly more conveniently.

An aspect of an embodiment of the present disclosure provides a stroller seat assembly including:

a seat portion;

a backrest part, the inclination angle of which relative to the seat part is adjustable;

an armrest part which is arranged between the seat part and the backrest part and is rotatablely arranged relative to the seat part;

the joint assembly is used for connecting the backrest part, the armrest part and the seat part together, and comprises a first locking and unlocking component, a second locking and unlocking component and an actuator which synchronously rotates along with the backrest part, wherein the first locking and unlocking component and the second locking and unlocking component are connected with the actuator;

a force transfer member;

the first operating piece is connected with the actuating piece through the force transmission piece and is configured to drive the actuating piece to move through the force transmission piece when the first operating piece moves to the first unlocking position so as to unlock the first locking and unlocking part through the movement of the actuating piece and allow the inclination angle of the backrest part relative to the seat part to be adjusted; and in the process of the backrest part turning back towards the seat part, the actuator is driven to rotate, so that the second locking and unlocking component is unlocked through the rotation of the actuator, and the armrest part is allowed to turn back towards the seat part.

In some embodiments, the backrest portion comprises a U-shaped tube, and both ends of the U-shaped tube are connected to both side ends of the seat portion in the width direction of the seat assembly by a joint assembly, respectively;

the first operating part is arranged in the middle of the transverse pipe of the U-shaped pipe, the force transmission part is arranged in the U-shaped pipe in a penetrating mode, and the force transmission part is connected with the first operating part and the actuating parts on the two sides respectively.

In some embodiments, the first operating member is disposed on the top of the transverse tube, a first end of the first operating member is rotatably connected with the transverse tube, the rotation axis is consistent with the extension direction of the transverse tube, and a second end of the first operating member is a free end and is configured to reach a first unlocking position when moving in a direction away from the transverse tube.

In some embodiments, the joint assembly further comprises:

a first joint member connected to a side end of the seat portion; and

the second joint piece comprises a first cover body part and a first connecting part which are connected with each other, the first cover body part is buckled at the inner side of the first joint piece along the width direction of the seat assembly, and the first connecting part is connected with the backrest part;

wherein, the inside of the first cover body part is provided with a first sliding groove, and the actuating piece is movably arranged in the first sliding groove.

In some embodiments, the joint assembly further comprises: a first joint member connected to a side end of the seat portion;

the first lock unlocking member includes:

a plurality of first engaging grooves provided on an inner side surface of the first joint member in the width direction of the seat assembly and arranged at intervals in the rotation direction of the backrest part; and

the boss is fixed on the actuating piece and is configured to be embedded into one of the first clamping grooves when the first operating piece is at the first locking position so as to fix the backrest part relative to the seat part; and when the first operating piece is in the first unlocking position, the first operating piece is separated from the first clamping groove so as to adjust the inclination angle of the backrest part.

In some embodiments, the actuator rotates with the backrest portion, and the second locking and unlocking member comprises:

the first bump is fixed on the outer side of the actuating piece along the width direction, and a first inclined plane is arranged on the first bump;

the thrust assembly is arranged on the outer side of the actuating element in the width direction, a second convex block is arranged on the side surface of the thrust assembly facing the first convex block, a second inclined surface is arranged on the second convex block, and a second clamping groove is formed in the circumferential direction of the thrust assembly; and

the clamping block is connected with the armrest part and is configured to be embedded into the second clamping groove when the first operating piece is at the first locking position so as to fix the armrest part relative to the seat part;

the first inclined surface is configured to be in contact with the second inclined surface in the process that the backrest part continuously rotates over the steepest-inclination-angle gear of the inclination angle, and the clamping block is separated from the second clamping groove through the motion matching of the first inclined surface and the second inclined surface, so that the second locking and unlocking component is enabled.

In some embodiments, the thrust assembly comprises:

the first thrust disc comprises a disc body and a second bump, and the second bump is arranged on one side, facing the first bump, of the disc body; and

the second thrust disc is coaxial with the first thrust disc, a second clamping groove is formed in the side wall of the second thrust disc, the groove bottom of the second clamping groove is an inclined plane, and the radial size of the groove bottom is gradually increased from outside to inside along the width direction;

when the first operating piece is located at the first unlocking position and the backrest part rotates and folds back towards the seat part, the first inclined surface and the second inclined surface are matched in movement to enable the first thrust disc and the second thrust disc to move outwards along the width direction together so as to push the clamping block to be separated from the second clamping groove through the groove bottom of the second clamping groove.

In some embodiments, the end of the engaging block is provided with an inclined surface, and the inclined surface is matched with the groove bottom of the second clamping groove.

In some embodiments, the second protrusions are provided in two and are arranged in central symmetry with respect to a center line of the thrust assembly, which coincides with the rotation axis of the backrest portion and the armrest portion.

In some embodiments, the joint assembly further comprises:

the third joint piece comprises an annular part and a second connecting part which are mutually connected, the annular part is coaxially sleeved outside the thrust assembly and is positioned on the outer side of the first joint piece along the width direction, and the second connecting part is connected with the armrest part; the inner wall of the annular part is provided with a guide groove extending along the inner part of the second connecting part;

wherein, the block of block slidable establishes in the guide slot.

In some embodiments, the joint assembly further comprises:

a first joint member connected to a side end of the seat portion, the first joint member including a first disk portion, a shaft portion, and a first flange portion, the first disk portion, the shaft portion, and the first flange portion being coaxially provided, the shaft portion extending at least in a width direction toward an outer side of the first disk portion, the first flange portion being provided on a side surface of the first disk portion facing outward in the width direction and located radially outward of the shaft portion; and

a cover body which is arranged coaxially with the first joint member and includes a second disk portion and an annular second flange portion, the second flange portion being in contact with the first flange portion;

the third joint part is arranged between the first disc part and the second disc part along the width direction and sleeved on the circumferential outer sides of the first flange part and the second flange part; be equipped with the internal spline on the inner wall of first flange portion and second flange portion, thrust subassembly cover is established on the axial region, and is equipped with on the outer wall of thrust subassembly with internal spline complex external spline to the cooperation of motion through first inclined plane and second inclined plane makes thrust subassembly remove along width direction, thereby makes the block break away from the second draw-in groove.

In some embodiments, the joint assembly further includes a first restoring element disposed between the thrust assembly and the cover configured to restore the thrust assembly after the back portion and the armrest portion are deployed relative to the seat portion.

Another aspect of embodiments of the present disclosure provides a stroller including the stroller seat assembly of the above-described embodiments.

In some embodiments, further comprising a frame configured to support the stroller seat assembly, the joint assembly further comprising:

the first joint part is connected with the side end of the seat part, and is provided with mounting holes along the rotation axes of the backrest part and the armrest part;

the third locking and unlocking component comprises a shaft and a hole arranged on the frame, the shaft coaxially penetrates through the first joint part, and the shaft is movably arranged along the rotation axis relative to the first joint part; and

a second operating member configured to extend an end of the shaft outwardly into engagement with the aperture to relatively secure the stroller seat assembly to the frame when in the second locked position; and when moved to a second unlocked position, retracts the shaft out of engagement with the aperture to allow the stroller seat assembly to be removed from the frame.

In some embodiments, the second operating member is provided with a third inclined surface, and the third locking and unlocking member further includes:

the sleeve part is coaxially and fixedly arranged in the mounting hole and penetrates through the second operating part, and a guide groove is formed in the side wall of the sleeve part along the rotating axis;

the pin shaft penetrates through the shaft and the guide groove along the radial direction, and the outer side wall of the pin shaft is in contact with the third inclined surface;

the second operating piece is configured to enable the pin shaft to be in contact with the lowest position of the third inclined surface when the second operating piece is in the second locking position; and in the process of moving from the second locking position to the second unlocking position, the pin shaft is driven to move along the guide groove through the third inclined surface so as to drive the shaft to retract into the disengaging hole.

In some embodiments, the third inclined surface gradually increases in thickness along the rotation axis from bottom to top to allow the pin to retract inward by sliding upward when the second operating member is pressed.

In some embodiments, the second operating member is provided with a first through hole along the rotation axis, both sides of the first through hole are provided with third inclined surfaces with the same inclination angle, and both ends of the pin shaft are respectively overlapped on the third inclined surfaces on both sides.

In some embodiments, the actuating member is provided with a second sliding groove on the inner side in the width direction;

the second operating piece is movably arranged in the second sliding chute, and the moving direction of the second operating piece is consistent with that of the actuating piece.

In some embodiments, the joint assembly further comprises:

a second joint member provided on the inner side of the first joint member in the width direction and connected to the backrest portion, a limiting portion provided between the second joint member and the second operating member and configured to limit the second operating member at the second lock position; and

the second reset element is arranged between the second operating piece and the actuating piece and is configured to reset the second operating piece when the first operating piece is at the first locking position; and resetting the first operating member when the second operating member is in the second locking position.

In some embodiments, the joint assembly further comprises:

a second joint member provided on the inner side of the first joint member in the width direction and connected to the backrest portion;

a fixing member provided at an inner end portion of the sleeve member and configured to fix the sleeve member to the second joint member; and

a third reduction element disposed within the sleeve member and between the fixed member and the end of the shaft is configured to reduce the shaft.

The stroller seat assembly of the disclosed embodiment, the first operating member is configured to move the actuating member via the force transmitting member when moved to the first unlocking position to unlock the first locking and unlocking member via movement of the actuating member, allowing adjustment of the tilt angle of the backrest portion relative to the seat portion; and in the process of the backrest part turning back towards the seat part, the backrest part drives the actuating piece to rotate, so that the second locking and unlocking component is unlocked through the rotation of the actuating piece, and the armrest part is allowed to turn back towards the seat part. The seat assembly can conveniently adjust the inclination angle of the backrest part, and conveniently folds the whole seat assembly back for folding when the first operating part is in the first unlocking position, so that the mechanism can be simplified, the operation is easy, and the adjustment and folding of the seat assembly are more convenient.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:

fig. 1 is a perspective view of some embodiments of a stroller seat assembly of the present disclosure;

FIG. 2 is an exploded view of some embodiments of the stroller seat assembly of the present disclosure;

FIG. 3 is a schematic front view of a back portion of some embodiments of the disclosed stroller seat assembly;

FIG. 4 is a schematic rear view of the back portion of some embodiments of the disclosed stroller seat assembly;

FIG. 5 is a cross-sectional view of a first operating member mounted to the back portion of some embodiments of the disclosed stroller seat assembly;

FIG. 6 is a cross-sectional view of the first operating member of FIG. 5 raised relative to the backrest portion;

FIG. 7 is a side schematic view of some embodiments of the stroller seat assembly of the present disclosure;

FIG. 8 is an inside perspective view of the first lock release member with the first operating member in the first locked position;

FIG. 9 is an outside perspective view of the first lock release member with the first operating member in the first locked position;

FIG. 10 is an enlarged view taken at K in FIG. 4, corresponding to the first operating member being in the first locked position;

FIG. 11 is an inside perspective view of the first lock release member with the first operating member moved to the first release position;

FIG. 12 is an outside perspective view of the first lock release member with the first operating member moved to the first release position;

FIG. 13 is a schematic view of the first operating member being moved to a first unlocked position;

FIG. 14 is a schematic view of the back rest in three tilt adjustment positions;

FIG. 15 is an inside view of the second locking/unlocking member when the first operating member is at the first locking position;

FIG. 16 is an outside view of the second locking/unlocking member when the first operating member is at the first locking position;

FIG. 17 is a perspective view of the second locking/unlocking member in a locked state when the first operating member is in the first locking position;

FIG. 18 is an inside perspective view of the second locking/unlocking member in the unlocked position with the first operating member in the first unlocking position;

FIG. 19 is an outside perspective view of the second locking/unlocking member in the unlocked position with the first operating member in the first unlocking position;

FIG. 20 is a perspective view of the second locking and unlocking member in an unlocked state when the first operating member is in the first unlocking position;

FIG. 21 is a schematic view of the back portion folded back toward the armrest portion;

FIG. 22 is a schematic view of the back rest portion and the armrest portion both folded back toward the seat portion;

FIG. 23 is the schematic view of the secondary operating member in the secondary locked position;

FIG. 24 is a schematic structural view of the third locking/unlocking member when the second operating member is at the second locking position;

FIG. 25 is a perspective view of the sleeve member, shaft and pin arrangement with the second operating member in the second locked position;

FIG. 26 is a cross-sectional view of the articulation assembly with the secondary operating member in the second locked position;

FIG. 27 is a medial perspective view of the joint assembly shown in section with the second operating member in the second locked position;

FIG. 28 is a schematic view of the secondary operating member engaged with the actuator when the secondary operating member is in the secondary locking position;

FIG. 29 is a schematic view of the second operating member in the second unlocked position;

FIG. 30 is a schematic structural view of the third locking/unlocking member when the second operating member is in the second unlocking position;

FIG. 31 is a perspective view of the sleeve member, shaft and pin arrangement with the second operating member in the second unlocked position;

FIG. 32 is a cross-sectional view of the joint assembly with the secondary operating member in the second unlocked position;

FIG. 33 is an inside view of the joint assembly as cut away with the second operating member in the second unlocked position;

FIG. 34 is a schematic view of the engagement of the second operating member with the actuator when the second operating member is in the second release position;

FIG. 35 is a schematic structural view of the second operating member;

FIG. 36 is a schematic view of the actuator;

FIG. 37 is a schematic view of a second articular component;

FIG. 38 is a schematic view of the first joint member mounted to the seat portion;

FIG. 39 is a schematic view of a third articular component;

FIG. 40 is a schematic view of a first thrust plate;

FIG. 41 is a schematic view of the structure of the cover;

fig. 42 is an exploded view of one embodiment of the disclosed stroller as an assembly.

Detailed Description

The present disclosure is described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Aspects so defined may be combined with any other aspect or aspects unless clearly indicated to the contrary. In particular, any feature considered to be preferred or advantageous may be combined with one or more other features considered to be preferred or advantageous.

The terms "first", "second", and the like in the present disclosure are merely for convenience of description to distinguish different constituent elements having the same name, and do not denote a sequential or primary-secondary relationship.

In the description of the present disclosure, it is to be understood that the terms "inner", "outer", "top", "bottom", "front", "rear", "left" and "right", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present disclosure, and do not indicate or imply that the devices referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be taken as limiting the scope of the present disclosure. Where the orientations "front", "rear", "left" and "right" are defined in terms of the orientation of the infant seated in the seat assembly. Wherein the length direction refers to the front-rear direction of the stroller seat assembly and the width direction refers to the left-right direction of the stroller seat assembly.

The present disclosure provides a stroller including a frame configured to support a seat assembly, the frame enabling walking of the stroller when subjected to an external force, and a stroller seat assembly (hereinafter "seat assembly"), the seat assembly being integrally mountable to the frame for seating a baby or child, e.g., detachably mountable.

Fig. 1-42 are schematic views of seat assemblies for strollers of the present disclosure. In some embodiments, as shown in fig. 1, the seat assembly comprises: a seat part 3, a backrest part 12, armrest parts 2, a pedal part 4, a joint component B, a force transmission piece 11 and a first operation piece A.

The backrest portion 13 is connected above the rear end of the seat portion 3, and the inclination angle with respect to the seat portion 3 is adjustable. At least one U-shaped framework 1 is rotatably arranged on the backrest part 13, and the framework 1 is fixed on the roof and used for realizing folding and unfolding of the roof. The armrest portion 2 is provided between the seat portion 3 and the backrest portion 13, and is rotatably provided with respect to the seat portion 3. The step portion 4 is connected below the front end of the seat portion 3.

The joint assembly B connects the backrest portion 13, the armrest portion 2, and the seat portion 3 together, and the backrest portion 13 and the armrest portion 2 are detachably provided. The joint assembly B comprises a first locking and unlocking component, a second locking and unlocking component and an actuator 16, wherein the first locking and unlocking component and the second locking and unlocking component are both connected with the actuator 16, and the actuator 16 rotates synchronously with the backrest 13. Preferably, the center line of the joint assembly B coincides with the rotation axis of the backrest portion 13 and the armrest portion 2 to simplify the structure.

The first operating member a is connected to the actuating member 16 via a force transmitting member 11, for example, the force transmitting member 11 may be a wire rope, a chain, a fiber rope, or other elongated structure capable of transmitting force. The first operating member a has two positions including a first locked position and a first unlocked position.

The first operation element a is configured to fix the backrest portion 13, the armrest portion 2, and the seat portion 3 when in the first locking position; and when moved to the first unlocking position, the actuator 16 is moved by the force transmission member 11 to unlock the first locking and unlocking member by movement of the actuator 16, allowing adjustment of the inclination of the backrest portion 13 relative to the seat portion 3, either by continuous adjustment or by multi-step adjustment, for example, by movement of the actuator 16 to unlock the first locking and unlocking member; and when the first operating element A is in the first locking position, the first locking and unlocking component is in an unlocking state, and the backrest part 13 rotates and folds towards the seat part 3, the backrest part 13 drives the actuator 16 to move, so that the second locking and unlocking component is unlocked through the rotation of the actuator 16, the armrest part 2 is allowed to rotate and fold towards the seat part 3, and at the moment, because the first locking and unlocking component is also unlocked, both the armrest part 2 and the backrest part 13 can fold relative to the seat part 3, and the folding of the seat component is realized.

The seat assembly of this embodiment of this disclosure can conveniently adjust the inclination of back portion to conveniently fold whole seat assembly back when first operating parts is in first unblock position and receive, can simplify the mechanism, easily operation makes the regulation and the receipts of seat assembly more convenient.

As shown in fig. 2, the backrest portion 13 comprises a U-shaped pipe, both ends of which are connected to both side ends of the seat portion 3 in the width direction of the seat assembly by a joint assembly B, respectively; the U-shaped pipe includes two standpipe and the violently pipe of being connected with the top of two standpipes. The first operating part A is arranged in the middle of the transverse pipe of the U-shaped pipe, the force transmission part 11 penetrates through the U-shaped pipe, and the force transmission part 11 is connected with the first operating part A and respectively connected with the actuating parts 16 on two sides.

By inserting the force transmission member 11 into the U-shaped tube of the backrest portion 13, the guiding function of the U-shaped tube can be fully utilized when the force transmission member 11 is pulled, the force transmission member 11 is not separated, the reliability of locking and unlocking can be provided, and the structure of the seat assembly can be simplified.

The backrest portion 13 further includes a support member, both ends of which in the width direction are connected to the two vertical tubes of the U-shaped tube, in order to support the back of the occupant. For example, the support member may be made of a flexible material, such as a support cloth or a support net, which reduces the weight of the seat assembly and facilitates carrying; or the support member may be made of a rigid material such as a plastic support plate.

The force transmission piece 11 can adopt two connection modes: firstly, two force transmission pieces 11 are adopted, the two force transmission pieces 11 are respectively positioned on two sides in a U-shaped pipe, one end of each force transmission piece 11 is connected with a first operating piece A, and the other end of each force transmission piece 11 is connected with an actuating piece 16. Secondly, a complete force transmission piece 11 is adopted, two ends of the force transmission piece 11 are respectively connected with two actuating pieces 16, and the middle part of the force transmission piece passes through a first operating piece A.

As shown in fig. 3 and 4, the first operating member a is arranged on the top of the transverse tube, a first end of the first operating member a is rotatably connected with the transverse tube, the rotating axis of the first operating member a is consistent with the extending direction of the transverse tube, and a second end of the first operating member a is a free end and is configured to reach a first unlocking position when moving in a direction away from the transverse tube.

The structure realizes unlocking by pulling the first operating element A upwards, so that a user can more conveniently carry out unlocking operation, the inclination angle of the backrest part 13 can be adjusted when the stroller is in a standing position, the operating angle is proper, and the force can be easily applied to the backrest part 13 by hands under the condition that the first operating element A is in the first unlocking position, so that the inclination angle of the backrest part 13 can be adjusted; and when the backrest part 13 is at the steepest gear, the seat assembly can be folded back as a whole by continuously pushing towards the seat part 3, and the operation is convenient.

As shown in fig. 10, the first operation member a includes: the protection member 5 is buckled on the trip member 6 to cover the structure inside the trip member 6. In order to fix the first operating part A on the transverse tube of the U-shaped tube of the backrest part 13, the arc-shaped mounting plate 10 is fixed on the U-shaped tube, the trip piece 6 can be in a rectangular structure with radian, the first end of the trip piece 6 is rotatably fixed on the mounting plate 10, the second end is a free end, and the trip piece 6 and the second end of the buckling piece 5 can be integrally lifted upwards to realize unlocking.

As shown in fig. 5, two guide posts 101 are provided on the mounting plate 10 at intervals along the extending direction of the cross tube. Two guide grooves 61 are arranged on the inner side surface of the trigger 6 at intervals along the extension direction of the transverse pipe, the guide grooves 61 can be in a U-shaped structure, the guide grooves 61 extend along the length direction of the seat assembly, the guide grooves 61 are positioned on the inner side of the guide columns 101, openings are formed in the side walls of the guide grooves 61, after one force transmission piece 11 penetrates into the guide grooves 61 from an opening in the top of the trigger 6, penetrates through the openings in the side walls of the guide grooves 61, penetrates through the U-shaped pipe of the backrest part 13 after being guided by the guide columns 101, and is finally connected with the actuating piece 16 on the same side.

When the second end of the first operating member A is pulled upwardly, the force transmitting member 11 is pulled upwardly, thereby moving the actuating member 16 upwardly for unlocking, as shown in FIG. 6.

As shown in fig. 38, the joint assembly B further includes: a first articular component 40 and a second articular component 17. The first joint members 40 are connected to the side ends of the seat portion 3, one first joint member 40 is provided at each of the ends of the seat portion 3 on both sides in the width direction, and the first joint members 40 are fixedly connected to the seat portion 3 or integrally formed therewith. The backrest part 13, the second articulation part 17 and the actuating element 16 are always at the same angle. As shown in fig. 37, the second joint member 17 includes a first cover portion 171 and a first connecting portion 172 connected to each other, and the first cover portion 171 may be a circular cover that is engaged with the inner side of the first joint member 40 in the width direction of the seat assembly; the first connecting portion 172 is connected to the backrest portion 13, the first connecting portion 172 may have a tubular structure, and a U-shaped tube of the backrest portion 13 may be inserted into the first connecting portion 172 and fixed by a snap-fit structure or a fastener.

As shown in fig. 8, a first sliding groove 173 is formed in the inner side of the first cover portion 171, and the actuating member 16 is movably disposed in the first sliding groove 173. Since the second articulation part 17 is connected to the U-shaped tube of the backrest part 13, the force-transmitting part 11 can be connected directly to the actuating part 16 after passing through the U-shaped tube, the construction is simple, the force transmission is stable, and the actuating part 16 is prevented from being stuck during unlocking by the guiding action of the first runner 173.

The specific configuration of each lock unlocking member will be described in detail below.

In some embodiments, as shown in fig. 9, joint assembly B further comprises: the first joint member 40 is connected to a side end of the seat portion 3. The first lock unlocking member includes: a plurality of first engaging grooves 401, for example, rectangular, triangular or trapezoidal engaging grooves, provided on the inner side surface of the first joint member 40 in the width direction of the seat assembly and spaced apart in the rotation direction of the backrest portion 13; and a boss 161 fixed to the actuator 16 and configured to be inserted into one of the first engaging grooves 401 when the first operating element a is in the first locking position, so as to fix the backrest portion 13 with respect to the seat portion 3; and disengages the first catch 401 when the first operating member a is in the first unlocking position to perform reclining adjustment of the backrest portion 13.

As shown in FIG. 9, the bosses 161 are provided on the outer side of the actuator 16 in the width direction, and the bosses 161 can be fixed to the actuator 16 or formed integrally. Alternatively, the boss 161 can be provided at the bottom of the actuator 16.

When the first operating member a is in the first locking position, as shown in fig. 10, the second operating member 14 is engaged with the second joint member 17, and the actuator 16 is positioned at the lowermost end by the second restoring member 15, as shown in fig. 8 and 9, and the boss 161 is engaged with one of the first engaging grooves 401, so that the backrest portion 13 is fixed relative to the seat portion 3.

When the first operating member a is pulled upward to the first unlocking position as shown in fig. 13, the actuating member 16 is pulled upward by the force transmitting member 11 and disengaged from the first engaging groove 401, as shown in fig. 11 and 12, and the rotation restriction of the backrest portion 13 is released, so that the backrest portion 13 can be adjusted in tilt angle. As shown in fig. 14, when the boss 161 is fitted into the rightmost first engaging groove 401, the backrest 13 is located at the steepest tilt angle position; when the boss 161 is fitted into the leftmost first engaging groove 401, the backrest 13 is located at the slowest tilt angle position; when the boss 161 is engaged in the first intermediate slot 401, the backrest 13 is in the intermediate tilt position.

In some embodiments, as shown in fig. 17, the actuator 16 rotates with the second joint member 17 and the backrest portion 13, and the second locking and unlocking member includes: first projection 163, thrust assembly, and engagement block 30.

The first protrusion 163 is fixed on the outer side of the actuator 16 in the width direction, the first protrusion 163 is provided with a first inclined surface, the first protrusion 163 can be fixed on the actuator 16 or integrally provided with the actuator 16, and more preferably, the boss 161, the first protrusion 163 and the actuator 16 are integrally formed.

As shown in fig. 16, the pushing assembly is disposed at the outer side of the actuating component 16 along the width direction, the pushing assembly is provided with a second protrusion 322 on the side facing the first protrusion 163, the second protrusion 322 is provided with a second inclined surface 3222, and the pushing assembly is provided with a second locking groove 331 in the circumferential direction; and an engagement block 30 connected to the armrest portion 2 and configured to be fitted into the second engagement groove 331 when the first operating element a is at the first locking position, so that the armrest portion 2 is fixed with respect to the seat portion 3.

When the boss 161 is inserted into the rightmost first engaging groove 401, the backrest 13 is located at the steepest tilt angle position, and the first inclined surface and the second inclined surface are about to contact. The first inclined surface is configured to contact the second inclined surface 3222 during continuous rotation of the backrest portion 13 over the steepest-inclination-angle position, and disengage the engaging block 30 from the second engaging groove 331 by cooperation of movement of the first inclined surface and the second inclined surface 3222, so that the second locking/unlocking member is unlocked.

This embodiment can convert the upward movement of the actuator 16 into a first locking and unlocking component, and convert the rotational movement of the backrest 13 with the actuator 16 into an unlocking force of a second locking and unlocking component, so that the unlocking of the two locking and unlocking structures is relatively independent, and the adjustment and folding of the seat assembly can be more reliable.

Still referring to fig. 17, the thrust assembly includes: a first thrust disk 32 and a second thrust disk 33.

As shown in fig. 40, the first thrust plate 32 includes a plate 321 and a second protrusion 322, the second protrusion 322 is disposed on a side of the plate 321 facing the first protrusion 163, the second protrusion 322 is provided with a flat surface 3221 and a second inclined surface 3222 along a circumferential direction of the plate 321, when the first operating element a is in the first unlocking position and the backrest 13 rotates toward the seat 3, the first inclined surface and the second inclined surface 3222 move relatively in the circumferential direction, and when the flat surface 3221 is reached, the second locking/unlocking member is unlocked and stably located in the unlocking position.

Preferably, as shown in fig. 40, there are two second protrusions 322, which are arranged in a central symmetry manner with respect to the center line of the pushing assembly, so that the second inclined surfaces 3222 on the two second protrusions 322 are inclined in the same direction. Accordingly, two first projections 163 are provided. Wherein the centre line of the thrust assembly coincides with the axis of rotation of the backrest portion 13 and the armrest portion 2. By providing the two second protrusions 322, the first protrusions 163 can apply axial thrust to both sides of the first thrust disk 32, so that the application of force is more stable, and unlocking of the second locking/unlocking member is more reliable.

As shown in fig. 17, the second thrust disk 33 is disposed coaxially with the first thrust disk 32, a second locking groove 331 is disposed on a side wall of the second thrust disk 33, a groove bottom of the second locking groove 331 is an inclined surface, and a radial dimension of the groove bottom is gradually increased from outside to inside in the width direction. The outer end face of the first thrust disc 32 in the width direction is provided with teeth 3221, and the end face of the second thrust disc 33 facing the first thrust disc 32 is also provided with teeth, so that the first thrust disc 32 and the second thrust disc 33 are fitted together, and under any state of the backrest 13, the first thrust disc 32 and the second thrust disc 33 are in rigid contact, have no relative displacement, can synchronously move in the axial direction, and cannot rotate under the clamping position of the pin shaft 18. In addition, in any condition of the backrest 13, the first thrust disk 32 and the second thrust disk 33 are brought close to the actuator 16 by the action of the first return element 36.

As shown in fig. 15 and 16, when the first operating element a is at the first locking position, the engaging block 30 is engaged in the second engaging groove 331 by the third returning element 29 to fix the armrest portion 2 relative to the seat portion 3.

As shown in fig. 17 to 20, when the first operating element a is in the first unlocking position, in the process of rotating and folding the backrest portion 13 back towards the seat portion 3, the backrest portion 13 drives the actuator 16 to rotate, and the first inclined surface and the second inclined surface 3222 cooperate to move the first thrust plate 32 and the second thrust plate 33 outwards in the width direction together, so as to push the engaging block 30 to disengage from the second engaging groove 331 through the groove bottom of the second engaging groove 331, referring to fig. 20. Since the rotation restriction of the armrest portion 2 is released, as shown in fig. 21, the armrest portion 2 can be rotationally retracted toward the seat portion 3, and at this time, the backrest portion 13 can be rotationally retracted toward the seat portion 3 in a state of being also contact-restricted. As shown in fig. 22, the seat member is in a fully folded-back state.

Further, the end of the engaging block 30 is provided with an inclined surface, and is matched with the groove bottom of the second engaging groove 331. With the structure, the groove bottom of the second clamping groove 331 can provide more stable driving force for the clamping block 30 to realize unlocking.

As shown in fig. 18 and 39, the joint assembly B further includes a third joint member 31, the third joint member 31 includes a ring portion 311 and a second connecting portion 312 that are connected to each other, the ring portion 311 is coaxially sleeved outside the thrust assembly and is located outside the first joint member 40 in the width direction, the second connecting portion 312 is connected to the armrest portion 2, the armrest portion 2 may adopt a U-shaped structure, the second connecting portion 312 may adopt a tubular structure, and an end portion of the U-shaped structure may be inserted into the second connecting portion 312 and connected thereto by a fastener or a quick-insertion structure. The inner wall of the annular portion 311 is provided with a guide groove 313 extending along the inside of the second connection portion 312. The engaging block 30 is slidably disposed in the guide groove 313.

As shown in fig. 18, a fourth returning member, such as a spring, is provided between the bottom of the guide groove 313 and the engaging piece 30 to fit the engaging piece 30 into the guide groove 313 after the seat assembly is unfolded.

As shown in fig. 26, the joint assembly B further includes: a first joint member 40 connected to a side end of the seat portion 3, the first joint member 40 including a first disk portion 406, a shaft portion 402, and a ring-shaped first flange portion 403, which are coaxially provided, the shaft portion 402 extending at least in the width direction toward the outside of the first disk portion 406, the first flange portion 403 being provided on a side surface of the first disk portion 406 facing outward in the width direction and located radially outside the shaft portion 402; and a lid 38 provided coaxially with the first joint member 40, the lid 38 including a second disc portion 381 and an annular second flange portion 382, the second flange portion 382 being provided to face and abut the first flange portion 403.

The third joint member 31 is disposed between the first disc portion 406 and the second disc portion 381 along the width direction, and is sleeved on the circumferential outer sides of the first flange portion 403 and the second flange portion 382; as shown in fig. 41, the inner walls of the first flange portion 403 and the second flange portion 382 are provided with inner splines, the thrust member is sleeved on the shaft portion 402, and the outer wall of the thrust member is provided with outer splines matched with the inner splines, so that the thrust member moves in the width direction through the motion matching of the first inclined surface and the second inclined surface 3222, and the engaging block 30 is disengaged from the second engaging groove 331.

Specifically, the first thrust disk 32 and the second thrust disk 33 are coaxially sleeved on the shaft portion 402, the outer circumferential side wall of the second thrust disk 33 is provided with an external spline, and the first thrust disk 32 can apply force to the second thrust disk 33 to move in a space defined by the first flange portion 403 and the second flange portion 382.

As shown in fig. 20, the joint assembly B further includes a first restoring element 36, such as a spring, disposed outside the shaft portion 402 and between the thrust assembly and the cover 38, and configured to restore the thrust assembly after the backrest portion 13 and the armrest portion 2 are unfolded with respect to the seat portion 3. In order to improve the stability of reduction, the joint component B further comprises a second reduction element 34, the first reduction element 36 is sleeved outside the second reduction element 34, the first reduction element 36 abuts against the second thrust disc 33, and the second reduction element 34 abuts against the first thrust disc 32.

To prevent the thrust assembly from rotating in the circumferential direction, as shown in FIG. 38, the shaft portion 402 is provided with a plurality of splines 404 at circumferentially spaced intervals. As shown in fig. 40, the first thrust disk 32 is axially provided with a through hole 3212, and a plurality of protrusions 3213 engaged with the key slots 404 are spaced apart from each other on an inner wall of the through hole 3212. As shown in fig. 32, a thrust member 35 is provided between the first restoring member 36 and the cover 38, and the thrust member 35 is inserted into the shaft 402 and is engaged with the shaft 402 by a key groove to prevent circumferential rotation.

Secondly, the present disclosure also provides a stroller comprising the stroller seat assembly of the above embodiment.

In some embodiments, the stroller further comprises a frame configured to support the stroller seat assembly. As shown in fig. 23 to 35, the joint assembly B further includes: a first joint member 40, a third locking and unlocking member, and a second operating member 14.

As shown in fig. 38, the first joint member 40 is connected to the side end of the seat portion 3, and the first joint member 40 is provided with a mounting hole 405 along the rotation axis of the backrest portion 13 and the armrest portion 2.

As shown in fig. 26, the third lock/unlock member includes a shaft 23 and a hole provided on the vehicle frame, the shaft 23 coaxially passes through the first joint member 40, and the shaft 23 is movably provided along the rotation axis with respect to the first joint member 40 to unlock the third lock/unlock member.

The second operating member 14 is configured such that in the second locked position the end of the shaft 23 extends outwardly into engagement with the aperture to fix the stroller seat assembly relative to the frame; and when moved to the second unlocked position, retracts the shaft 23 out of engagement with the aperture to allow the stroller seat assembly to be removed as a whole from the frame, yet allow the seat assembly to be folded when removed.

As shown in fig. 26 to 28, the second operating element 14 is provided with a third inclined surface 141, and the third locking/unlocking member further includes: a sleeve member 39 coaxially and fixedly disposed in the mounting hole 405, wherein the inner end of the sleeve member passes through the actuating member 16 and the second operating member 14 in sequence, and a guide groove 394 is formed in a side wall of the sleeve member 39 along the rotation axis; the pin 18, which radially passes through the shaft 23 and the guide groove 394, contacts the outer sidewall of the pin 18 with the third inclined surface 141.

Wherein the second operating member 14 is configured to bring the pin 18 into contact with the lowest position of the third inclined surface 141 when in the second locking position; and during the movement from the second locking position to the second unlocking position, the pin 18 is driven to move along the guide groove 394 by the third inclined surface 141 to drive the shaft 23 to retract into the disengagement hole.

This embodiment enables the pin 18 to be driven in movement by the third ramp 141 during movement of the second operating member 14, thereby driving the shaft 23 to move within the sleeve member 39 to lock the shaft 23 to the frame when the seat assembly is projecting into the aperture in the frame and to disengage the shaft 23 from the frame when the seat assembly is retracted out of the aperture in the frame.

As shown in fig. 28, the third inclined surface 141 gradually increases in thickness along the rotation axis from bottom to top to allow the pin 18 to be retracted inward by sliding upward when the second operating member 14 is pressed. This structure makes it easy to apply force to the second operation element 14 to unlock the seat, and the seat unit 3 is provided with one second operation element 14 on each of the left and right sides, and can be detached by applying pressing force to both the second operation elements 14.

As shown in fig. 28, the second operating element 14 is provided with a first through hole 142 along the rotation axis, for example, an elongated hole extending along the moving direction of the second operating element 14 is adopted, both sides of the first through hole 142 are provided with third inclined surfaces 141 with the same inclination angle, and both ends of the pin 18 are respectively overlapped on the third inclined surfaces 141 on both sides. The structure enables the pin shaft 18 to move more stably in the guide groove 394, the stress is balanced, and clamping stagnation is not easy to occur.

Further, as shown in fig. 27 and 28, the actuating member 16 is provided with a second through hole 162 along the rotational axis, for example, an elongated hole extending in the moving direction of the second operating member 14, and the inner end of the sleeve member 39 passes through the second through hole 162 and the first through hole 142 in sequence, and the elongated hole can provide a guide for the movement of the second operating member 14.

As shown in fig. 26, the joint assembly B further includes: a second joint member 17 provided on the inner side of the first joint member 40 in the width direction and connected to the backrest portion 13; a fixing member 20 provided at an inner end portion of the sleeve member 39 and configured to fix the sleeve member 39 to the second joint member 17; and a third return element 22, such as a spring, disposed within the sleeve member 39 and between the fixed member 20 and the end of the shaft 23, configured to return the shaft 23 when the second operating member 14 is in the second locked position.

Specifically, as shown in fig. 25, the sleeve member 39 is provided with a threaded section 393, a main section 391 and a thrust section 392 in the axial direction in order from the inside to the outside, and a guide groove 394 is provided on the main section 391 and penetrates along the threaded section 393. The sleeve member 39 is threaded through the mounting hole 405 from the outside of the cover 38 until it passes through the second joint member 17, and the fixing member 20 includes a nut that is screwed with the threaded section 393 outside the second joint member 17 to fix the sleeve member 39.

As seen in FIGS. 28 and 36, the actuating member 16 is provided with a second slide slot 164 on the inner side in the width direction, the second operating member 14 is movably disposed within the second slide slot 164, and the second operating member 14 is aligned with the direction of movement of the actuating member 16.

As shown in fig. 27, the joint component B further includes: a second joint member 17 provided on the inner side of the first joint member 40 in the width direction and connected to the backrest portion 13, and a stopper portion 144 provided between the second joint member 17 and the second operating member 14, for example, the stopper portion 144 is a stepped structure provided on the second operating member 14 and configured to stopper the second operating member 14 in the second lock position; and a second return element 15, for example a spring, provided between the second operating member 14 and the actuating member 16, for example between the base of the second operating member 14 and the actuating member 16, configured to return the second operating member 14 when the first operating member a is in the first locking position; and to reset the first operating member a when the second operating member 14 is in the second locking position.

The following is a detailed description of the principles of the seat assembly being removed from the vehicle frame.

As shown in FIG. 7, the second operating member 14 is located between the second joint member 17 and the third joint member 31. As shown in FIG. 23, when the second operating member 14 is at the second locking position, it moves upward under the action of the two second restoring elements 15 until the limiting portion 144 abuts against the second joint member 17, and at this time, the top of the second operating member 14 protrudes outward. As shown in fig. 24 and 25, the two ends of the pin 18 respectively overlap the third inclined surfaces 141 on the two sides, and the shaft 23 extends out of the sleeve member 39 under the action of the third restoring element 22, and drives the pin 18 to be at the lowest position of the third inclined surfaces 141. As shown in fig. 28, the second through hole 162 and the first through hole 142 are offset from each other in the height direction. At this point, the outer end of the shaft 23 extends into the aperture in the frame, placing the seat assembly in a locked condition.

When it is necessary to detach the seat assembly from the vehicle frame, as shown in fig. 29, the second operating members 14 on both sides of the seat plate portion 3 are simultaneously pressed by both hands, as shown in fig. 30, during the downward movement of the second operating members 14, the second returning member 15 is compressed, and the pin shaft 18 moves upward along the third inclined surface 141 while moving inward in the width direction, causing the shaft 23 to move inward, as shown in fig. 31 and 32. At this point, the axle 23 is retracted inboard and out of the hole in the frame to unlock the third lock and unlock member and the frame assembly can be removed from the frame.

The stroller seat assembly and stroller provided by the present disclosure are described in detail above. The principles and embodiments of the present disclosure are explained herein using specific examples, which are set forth only to help understand the method and its core ideas of the present disclosure. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present disclosure without departing from the principle of the present disclosure, and such improvements and modifications also fall within the scope of the claims of the present disclosure.

Claims (20)

1. A stroller seat assembly, comprising:

a seat portion (3);

a backrest part (13) whose inclination angle with respect to the seat part (3) is adjustable;

an armrest part (2) provided between the seat part (3) and the backrest part (13) and rotatably provided with respect to the seat part (3);

a joint assembly (B) connecting the backrest part (13), the armrest part (2) and the seat part (3) together, the joint assembly (B) comprising a first locking and unlocking component, a second locking and unlocking component and an actuator (16) rotating synchronously with the backrest part (13), the first locking and unlocking component and the second locking and unlocking component are both connected with the actuator (16);

a force transfer element (11);

a first operating member (A) connected to said actuating member (16) via said force-transmitting member (11) and configured to move said actuating member (16) via said force-transmitting member (11) when moved to a first unlocking position, so as to unlock said first locking and unlocking member by movement of said actuating member (16) and allow adjustment of the inclination of said backrest portion (13) with respect to said seat portion (3); and in the process of turning back the backrest part (13) towards the seat part (3), the actuator (16) is driven to rotate, so that the second locking and unlocking component is unlocked through the rotation of the actuator (16), and the armrest part (2) is allowed to turn back towards the seat part (3).

2. A stroller seat assembly according to claim 1, wherein the backrest part (13) comprises a U-shaped tube having both ends connected to both side ends of the seat part (3) in the width direction of the seat assembly via one of the joint assemblies (B), respectively;

the first operating piece (A) is arranged in the middle of the transverse pipe of the U-shaped pipe, the force transmission piece (11) penetrates through the U-shaped pipe, and the force transmission piece (11) is connected with the first operating piece (A) and respectively connected with the actuating pieces (16) on two sides.

3. A stroller seat assembly according to claim 2, wherein the first operating member (a) is arranged on top of the cross tube, a first end of the first operating member (a) is rotatably connected with the cross tube, and the rotation axis coincides with the extension direction of the cross tube, and a second end of the first operating member (a) is a free end and is configured to reach the first unlocking position when moving away from the cross tube.

4. The stroller seat assembly according to claim 1, wherein the joint assembly (B) further comprises:

a first joint member (40) connected to a side end of the seat portion (3); and

a second joint member (17) including a first cover portion (171) and a first connecting portion (172) connected to each other, the first cover portion (171) being engaged with an inner side of the first joint member (40) in a width direction of the seat assembly, the first connecting portion (172) being connected to the backrest portion (13);

wherein a first slide groove (173) is provided on the inner side of the first cover part (171), and the actuating element (16) is movably arranged in the first slide groove (173).

5. The stroller seat assembly according to claim 1, wherein the joint assembly (B) further comprises: a first joint member (40) connected to a side end of the seat portion (3);

the first lock unlocking member includes:

a plurality of first engaging grooves (401) provided on an inner side surface of the first joint member (40) in the width direction of the seat assembly and spaced apart in the rotation direction of the backrest portion (13); and

a boss (161) fixed to the actuator (16) and configured to engage one of the first slots (401) when the first actuator (a) is in a first locked position to fix the backrest portion (13) relative to the seat portion (3); and is disengaged from the first catch (401) when the first operating member (A) is in the first unlocking position, so as to adjust the inclination angle of the backrest part (13).

6. The stroller seat assembly according to claim 1, wherein the actuator (16) rotates with the backrest portion (13), and the second locking and unlocking member comprises:

a first projection (163) fixed to an outer side of the actuator (16) in a width direction of the seat assembly, the first projection (163) being provided with a first slope;

the pushing assembly is arranged on the outer side of the actuating piece (16) along the width direction, a second bump (322) is arranged on the side surface of the pushing assembly facing the first bump (163), a second inclined surface (3222) is arranged on the second bump (322), and a second clamping groove (331) is formed in the circumferential direction of the pushing assembly; and

an engagement block (30) connected to the armrest portion (2) and configured to be fitted into the second engagement groove (331) when the first operating element (A) is at a first locking position, so that the armrest portion (2) is fixed with respect to the seat portion (3);

wherein the first inclined surface is configured to contact with the second inclined surface (3222) during continuous rotation of the backrest part (13) beyond a steepest-inclination-angle position, and the engaging block (30) is disengaged from the second engaging groove (331) by cooperation of movement of the first inclined surface and the second inclined surface (3222) to disengage the second locking and unlocking member.

7. The stroller seat assembly of claim 6, wherein the push assembly comprises:

a first thrust disc (32) comprising a disc body (321) and the second lug (322), the second lug (322) being provided on a side of the disc body (321) facing the first lug (163); and

the second thrust disc (33) is coaxially arranged with the first thrust disc (32), the side wall of the second thrust disc (33) is provided with a second clamping groove (331), the bottom of the second clamping groove (331) is an inclined surface, and the radial size of the bottom of the groove is gradually increased from outside to inside along the width direction;

when the first operating piece (A) is in the first unlocking position and the backrest part (13) rotates and folds towards the seat part (3), the first inclined surface and the second inclined surface (3222) are matched in movement to enable the first thrust disc (32) and the second thrust disc (33) to move outwards along the width direction together, so that the clamping block (30) is pushed to be separated from the second clamping groove (331) through the groove bottom of the second clamping groove (331).

8. The stroller seat assembly according to claim 7, wherein the end of the catch block (30) is beveled and mates with the bottom of the slot of the second slot (331).

9. A stroller seat assembly according to claim 6, characterized in that the second cams (322) are provided in two and are arranged in a central symmetry with respect to a centre line of the thrust assembly, which coincides with the rotation axis of the backrest part (13) and the armrest part (2).

10. The stroller seat assembly according to claim 6, wherein the joint assembly (B) further comprises:

a first joint member (40) connected to a side end of the seat portion (3);

the third joint part (31) comprises an annular part (311) and a second connecting part (312) which are connected with each other, the annular part (311) is coaxially sleeved outside the thrust assembly and is positioned on the outer side of the first joint part (40) along the width direction, and the second connecting part (312) is connected with the armrest part (2); the inner wall of the annular part (311) is provided with a guide groove (313) extending along the inner part of the second connecting part (312);

wherein the engaging block (30) is slidably provided in the guide groove (313).

11. The stroller seat assembly according to claim 10, wherein the joint assembly (B) further comprises:

a first joint member (40) connected to a side end of the seat portion (3), the first joint member (40) including a first disk portion (406), a shaft portion (402), and a first flange portion (403) having an annular shape, the first disk portion (406) being coaxially disposed, the shaft portion (402) extending at least in the width direction toward an outer side of the first disk portion (406), the first flange portion (403) being provided on a side surface of the first disk portion (406) facing outward in the width direction and located radially outward of the shaft portion (402); and

a cover (38) that is provided coaxially with the first joint member (40), the cover (38) including a second disk portion (381) and an annular second flange portion (382), the second flange portion (382) abutting against the first flange portion (403);

wherein the third joint member (31) is provided between the first disc portion (406) and the second disc portion (381) in the width direction, and fitted over the circumferential outer sides of the first flange portion (403) and the second flange portion (382); the inner walls of the first flange portion (403) and the second flange portion (382) are provided with internal splines, the thrust assembly is sleeved on the shaft portion (402), the outer wall of the thrust assembly is provided with external splines matched with the internal splines, and the thrust assembly moves along the width direction through the motion matching of the first inclined surface and the second inclined surface (3222), so that the clamping block (30) is separated from the second clamping groove (331).

12. The stroller seat assembly according to claim 11, wherein the joint assembly (B) further comprises a first return element (36) provided between the thrust assembly and the cover (38) configured to return the thrust assembly after the backrest portion (13) and the armrest portion (2) are deployed with respect to the seat portion (3).

13. A stroller comprising the stroller seat assembly of any one of claims 1 to 12.

14. The stroller of claim 13, further comprising a frame configured to support the stroller seat assembly, the joint assembly (B) further comprising:

a first joint member (40) connected to a side end of the seat portion (3), the first joint member (40) having a mounting hole (405) along a rotation axis of the backrest portion (13) and the armrest portion (2);

a third locking and unlocking member including a shaft (23) and a hole provided on the frame, the shaft (23) coaxially passing through the first joint member (40), and the shaft (23) being movably provided along the rotation axis with respect to the first joint member (40); and

a second operating member (14) configured to extend an end of the shaft (23) outwardly into engagement with the aperture to fix the stroller seat assembly relative to the frame when in a second locked position; and when moved to a second unlocked position, retracts the shaft (23) out of engagement with the aperture to allow the stroller seat assembly to be detached from the frame.

15. The stroller of claim 14, wherein the second operating member (14) is provided with a third inclined surface (141), and the third locking/unlocking member further comprises:

the sleeve member (39) is coaxially and fixedly arranged in the mounting hole (405) and penetrates through the second operating member (14), and a guide groove (394) is formed in the side wall of the sleeve member (39) along the rotating axis;

a pin shaft (18) radially passing through the shaft (23) and the guide groove (394), an outer side wall of the pin shaft (18) being in contact with the third inclined surface (141);

wherein the second operating member (14) is configured to bring the pin (18) into contact with the lowest position of the third slope (141) when in the second locking position; and in the process of moving from the second locking position to the second unlocking position, the pin shaft (18) is driven to move along the guide groove (394) through the third inclined surface (141) so as to drive the shaft (23) to retract and disengage from the hole.

16. The stroller of claim 15, wherein the third ramp (141) increases in thickness from bottom to top along the pivot axis to retract the pin (18) inwardly by sliding upward when the second operating member (14) is pressed.

17. The stroller of claim 15, wherein the second operating member (14) is provided with a first through hole (142) along the rotation axis, the two sides of the first through hole (142) are respectively provided with the third inclined surfaces (141) with the same inclination angle, and two ends of the pin (18) are respectively overlapped on the third inclined surfaces (141) at the two sides.

18. The stroller of claim 14, wherein the actuating member (16) is provided with a second runner (164) along an inner side of the seat assembly in the width direction;

wherein the second operating member (14) is movably arranged in the second sliding chute (164), and the second operating member (14) is consistent with the moving direction of the actuating member (16).

19. The stroller of claim 18, wherein the joint assembly (B) further comprises:

a second joint member (17) that is provided on the inner side of the first joint member (40) in the width direction and is connected to the backrest portion (13), wherein a stopper portion (144) configured to stop the second operation member (14) in the second lock position is provided between the second joint member (17) and the second operation member (14); and

a second reset element (15) provided between the second operating member (14) and the actuator (16) and configured to reset the second operating member (14) when the first operating member (a) is in the first locking position; and to reset the first operating member (a) when the second operating member (14) is in the second locked position.

20. The stroller of claim 15, wherein the joint assembly (B) further comprises:

a second joint member (17) provided on the inner side of the first joint member (40) in the width direction of the seat assembly and connected to the backrest part (13);

a fixing member (20) provided at an inner end portion of the sleeve member (39) and configured to fix the sleeve member (39) to the second joint member (17); and

a third reduction element (22) provided in the sleeve member (39) and located between the fixing member (20) and the end of the shaft (23), configured to reduce the shaft (23).

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