Stroller frame

Abstract

The invention discloses a stroller frame which comprises a locking device, a first connecting seat is arranged at the upper end of a first supporting leg, a second connecting seat is arranged at the upper end of a second supporting leg, the first connecting seat is rotatably connected with the second connecting seat, a third connecting seat is rotatably connected to the second connecting seat, and a push rod assembly is connected to the third connecting seat. A transmission piece is arranged between the third connecting base and the first connecting base, the locking device comprises a locking rod rotationally connected to the second connecting base, one end of the locking rod is provided with a first clamping and locking part, the other end of the locking rod is provided with a second clamping and locking part, and the first connecting base is provided with a first clamping position capable of being clamped with the first clamping and locking part. The third connecting base is provided with a second clamping position capable of being clamped with the second clamping and locking part, the second connecting base is further provided with an unlocking linkage piece capable of triggering the locking rod to rotate, and the locking device further comprises a first reset spring connected to the second connecting base. The folding chair is simple in structure, convenient to fold, safe and stable.

Description

[Technical field]

[0001] The invention relates to a child stroller frame. [Background technology]

[0002] The stroller frame is a common product for children to grow up. Generally, the stroller can be unfolded or folded. In the unfolded state, it is convenient for children to sit on, and in the folded state, it is convenient to carry or store.

[0003] The frame of a child stroller is generally formed by a connecting rod mechanism. The connecting rod structures of child stroller frames on the market are various, and the folding action principles are different. Therefore, the present invention provides a new child stroller frame that is different from the existing child stroller frames. [Summary of the invention]

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a child stroller frame which is simple in structure, easy to fold and operate, and safe and stable.

[0005] The present invention is achieved through the following technical solutions:

[0006] A child stroller frame can be moved from an unfolded position to a folded position after a locking device is unlocked, comprises a first leg with wheels and a second leg, the first leg upper end of which is fixedly provided with a first connecting seat, the second leg upper end of which is fixedly provided with a second connecting seat, the first connecting seat and the second connecting seat are rotatably connected, the second connecting seat is rotatably connected to a third connecting seat, the third connecting seat is fixedly connected to a push rod assembly, a transmission member is provided between the third connecting seat and the first connecting seat, when the push rod assembly rotates toward the second leg, the transmission member can drive the first leg to rotate toward the second leg, the locking device comprises a middle The locking device further comprises a first reset spring connected to the second connecting seat and a second reset spring which is configured to push the locking rod to rotate and reset the locking rod.

[0007] The second connecting seat is provided with a seat connecting part, and the seat connecting part is detachably connected to a seat assembly, and the seat assembly includes a seat connecting seat detachably connected to the seat connecting part, and the seat connecting seat is connected to a seat part that can rotate relative to the seat connecting part, and a first locking assembly is provided between the seat part and the seat connecting seat, and a linkage block is provided in the seat connecting seat, which can trigger the movement of the unlocking linkage part when the seat part is rotated and folded.

[0008] A backrest portion which can rotate relative to the seat portion is arranged at the rear side of the seat portion, and a second locking assembly is arranged between the backrest portion and the seat portion.

[0009] The first locking assembly includes a first locking groove arranged on the seat part along a circumferential direction, a second locking groove is arranged on the seat connecting seat along a circumferential direction, a locking piece is arranged between the seat part and the seat connecting seat, which can move laterally and can engage with the first locking groove and the second locking groove at the same time, a first inclined surface is arranged on the locking piece along a circumferential direction, the backrest part is arranged between the seat part and the seat connecting seat, a protrusion is arranged at the lower end of the backrest part, which can push the first inclined surface to disengage the locking piece from the second locking groove when the backrest part is rotated and folded relative to the seat part, and a second return spring is also arranged between the seat part and the locking piece, which can push the locking piece to move and reset, a front armrest is arranged between the backrest part and the seat connecting seat, a plurality of third locking grooves are arranged on the front armrest in a circumferential direction, the locking piece is provided with a locking tooth that can engage with or disengage from the third locking groove, and when the locking piece disengages from the second locking groove, the locking tooth disengages from the third locking groove.

[0010] The seat part is provided with a convex shaft which can rotate relative to the seat connecting seat, and the convex shaft is provided with a pushing surface which can push the linkage block to move when the convex shaft rotates.

[0011] The unlocking linkage member includes a sliding block that can slide relative to the seat connecting part and can be pushed by the linkage block. The sliding block is provided with a protruding shaft, and the locking rod is provided with a connecting hole movably connected to the protruding shaft. When the sliding block slides downward, the protruding shaft pushes the wall of the connecting hole to rotate the locking rod.

[0012] The connecting hole is a non-circular hole, and when the protruding shaft pushes the hole wall of the connecting hole, the protruding shaft can slide relative to the hole wall of the connecting hole.

[0013] The transmission member includes a transmission plate, one end of which is pivotally connected to the first connecting seat, and the rotation axis of the transmission plate and the first connecting seat deviates from the rotation axis of the first connecting seat and the second connecting seat. The other end of the transmission plate is pivotally connected to the third connecting seat, and the rotation axis of the transmission plate and the third connecting seat deviates from the rotation axis of the third connecting seat and the second connecting seat.

[0014] The locking rod includes a curved body, the first locking portion is a hook provided at one end of the body and bent downward, the second locking portion is a protrusion provided at the other end of the body and tilted upward, and the first locking position and the second locking position are grooves provided on the outer peripheral surfaces of the first connecting seat and the third connecting seat.

[0015] The backrest portion includes a U-shaped backrest rod, the open end of the backrest rod is rotatably connected to the seat portion, the backrest rod is provided with a rear side frame protruding backwards, the rear side frame is provided with a support plate that can slide up and down relative to it, the support plate is provided with a mounting hole for inserting a safety belt, and a positioning structure that can locate the position of the support plate is provided between the support plate and the rear side frame.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. When the stroller frame of the present invention is in the unfolded state, the first locking part at one end of the locking rod is engaged with the first position on the first connecting seat, and at the same time, the second locking part at the other end of the locking rod is engaged with the second position on the third connecting seat. Therefore, the locking rod locks the first connecting seat and the third connecting seat at the same time, which can reduce the shaking of the stroller frame and ensure safety and stability. When the stroller frame needs to be folded, the locking rod is triggered to move by the unlocking linkage, so that the first locking part is disengaged from the first position and the second locking part is disengaged from the second position. At this time, the push rod assembly drives the first leg to rotate and approach the second leg through the transmission member during the process of rotating and approaching the second leg, so that the push rod assembly and the first leg are both close to the second support leg, ensuring convenient folding operation. Therefore, the stroller frame of the present invention has a simple structure, small shaking, safety and stability, convenient folding operation, flexible folding, and is suitable for popularization and application.

[0018] 2. The second connecting seat of the present invention is provided with a seat connecting part for detachably connecting the seat assembly, and when the seat part is rotated relative to the seat connecting seat and folded toward the first leg, the linkage block in the seat connecting seat can trigger the movement of the unlocking linkage member, thereby unlocking the locking device. Therefore, the locking device can be unlocked by simply rotating and folding the seat part, making the unlocking operation of the child stroller frame more convenient and quick.

[0019] 3. The support plate on the backrest of the present invention can be adjusted up and down, so the height of the safety belt can be adjusted, so that children of different heights can wear the safety belt and wear it comfortably.

Brief Description of the Drawings

[0020] Figure 1 It is a three-dimensional diagram of the present invention in an expanded state;

[0021] Figure 2 is a side view of the present invention in an expanded state;

[0022] Figure 3 is a three-dimensional diagram of the present invention when the seat assembly is removed;

[0023] Figure 4 yes Figure 3 Magnified view at A in the middle;

[0024] Figure 5 is a side view of the present invention without the seat assembly;

[0025] Figure 6 is one of the exploded views of the components of the present invention;

[0026] Figure 7 This is the second exploded view of the components of the present invention;

[0027] Figure 8 is a cross-sectional view of a component of the present invention;

[0028] Fig. 9 is a perspective view of a seat assembly of the present invention;

[0029] Fig.10 It is the third exploded view of the components of the present invention;

[0030] Fig.11 This is the fourth exploded view of the components of the present invention;

[0031] Fig.12 This is the fifth exploded view of the components of the present invention;

[0032] Fig.13 is a three-dimensional diagram of the locking member of the present invention;

[0033] Fig.14 This is the sixth exploded view of the components of the present invention;

[0034] Fig.15 is a perspective view of the components of the present invention;

[0035] Fig.16 This is the seventh exploded view of the components of the present invention;

[0036] Fig.17 is a partial stereoscopic view of a backrest rod of the present invention;

[0037] Fig.18 is a side view of the folding process of the seat assembly of the present invention when it is in the forward position;

[0038] Fig.19 is a three-dimensional diagram of the folded state of the seat assembly of the present invention when it is in the forward position;

[0039] Fig. 20 is a side view of the unfolded state of the seat assembly of the present invention when it is in the reverse position;

[0040] Fig.21 is a side view of the folding process of the seat assembly of the present invention when it is in the reverse position;

[0041] Fig. 22 It is a three-dimensional view of the folded state of the seat assembly of the present invention when it is in the reverse position. [Specific implementation method]

[0042] The present invention will be further described below in conjunction with the accompanying drawings:

[0043] like Figures 3 to 8 ,as well as Figures 18 to 22 As shown, a child stroller frame can be moved from an unfolded position to a folded position after a locking device is unlocked, comprising a first leg 11 and a second leg 12 with wheels 10, a first connecting seat 21 being fixedly disposed on the upper end of the first leg 11, a second connecting seat 22 being fixedly disposed on the upper end of the second leg 12, the first connecting seat 21 being rotatably connected to the second connecting seat 22, a third connecting seat 23 being rotatably connected to the second connecting seat 22, a push rod assembly 13 being fixedly connected to the third connecting seat 23, the push rod assembly 13 comprising a lower push rod 131 fixedly connected to the third connecting seat 23, an upper push rod 132 being provided inside the lower push rod 131 and being able to slide relative to the lower push rod 132, the A hand push handle 133 is provided at the upper end of the upper push rod 132, and a transmission member 3 is provided between the third connecting seat 23 and the first connecting seat 21, which can drive the first leg 11 to rotate toward the second leg 12 when the push rod assembly 131 rotates toward the second leg 12. The transmission member 3 includes a transmission plate 31, one end of the transmission plate 31 is pivoted to the first connecting seat 21, and the rotation axis of the transmission plate 31 and the first connecting seat 21 deviates from the rotation axis of the first connecting seat 21 and the second connecting seat 22, and the other end of the transmission plate 31 is pivoted to the third connecting seat 23, and the rotation axis of the transmission plate 31 and the third connecting seat 23 deviates from the rotation axis of the third connecting seat 23 and the second connecting seat 22. During the rotation of the push rod assembly 13 toward the second leg 12, the third connection seat 23 rotates relative to the second connection seat 22 and rotates relative to the transmission plate 31 at its eccentric position, thereby pulling the upper end of the transmission plate 31. During the movement, the transmission plate 31 rotates relative to the first connection seat 21 and pulls the first leg 11, so that the first leg 11 rotates relative to the second connection seat 22, so that the push rod assembly 13 and the first leg 11 are both close to the second leg 12, and the folding is flexible and reliable. The seat for the child can be a seat pocket connected to the push rod assembly 13, or a seat assembly 5 detachably connected to the second connection seat 22 as in the present embodiment.

[0044] like Figures 1 to 4 , Fig. 9As shown, the second connecting seat 22 is provided with a seat connecting portion 24, and the seat assembly 5 is detachably connected to the seat connecting portion 24. The seat assembly 5 includes a seat connecting seat 51 detachably connected to the seat connecting portion 24, and the seat connecting seat 51 is connected with a seat portion 52 that can rotate relative to the seat connecting seat 51. A first locking assembly 53 is provided between the seat portion 52 and the seat connecting seat 51. A backrest 55 that can rotate relative to the seat portion 52 is provided at the rear side of the seat portion 52, and a second locking assembly 56 is provided between the backrest 55 and the seat portion 52. A rotatable leg support frame 59 is also provided at the front side of the seat portion 52. When children travel by car, they sit on the seat portion 52, and the backrest 55 supports the back of the child.

[0045] like Figures 1 to 8 , Figures 18 to 22 As shown, the locking device includes a locking rod 40 rotatably connected to the second connecting seat 22 at the middle part, a first locking portion 41 is provided at one end of the locking rod 40, and a second locking portion 42 is provided at the other end of the locking rod 40, a first clamping position 43 capable of engaging with the first locking portion 41 is provided on the first connecting seat 21, a second clamping position 44 capable of engaging with the second locking portion 42 when the first locking portion 41 is engaged with the first clamping position 43 is provided on the third connecting seat 23, and an unlocking linkage 45 capable of triggering the locking rod 40 to rotate so that the first clamping position 43 is disengaged from the first locking portion 41 and the second clamping position 44 is disengaged from the second locking portion 42 is also provided on the second connecting seat 22, and the locking device also includes a first reset spring 46 connected to the second connecting seat 22 and capable of pushing the locking rod 40 to rotate and reset. In this embodiment, the first reset spring 46 is a torsion spring, one end of which is connected to the seat locking rod 40, and the other end is connected to the second connecting seat 22.

[0046] like Figures 1 to 8 , Figures 18 to 22As shown, the seat assembly 5 can be installed on the seat connection portion 24 in the forward direction or in the reverse direction. When the child stroller is in the unfolded state, the first locking portion 41 at one end of the locking rod 40 is engaged with the first locking position 43 on the first connection seat 21, and at the same time, the second locking portion 42 at the other end of the locking rod 40 is engaged with the second locking position 44 on the third connection seat 23. Therefore, the locking rod 40 locks the first connection seat 21 and the third connection seat 22 at the same time, reducing the shaking of the child stroller frame caused by the gap between the rods, ensuring safety and stability. When the stroller frame needs to be folded, the unlocking linkage 45 drives the triggering locking rod 40 to rotate, so that the first locking portion 41 is disengaged from the first locking position 43 and the second locking portion 42 is disengaged from the second locking position 44. At this time, the push rod assembly 13 drives the first leg 11 to rotate and approach the second leg 12 through the transmission member 3 during the process of rotating and approaching the second leg 12, so that the push rod assembly 13 and the first leg 11 are both close to the second support leg 12, ensuring convenient folding operation. Therefore, the stroller frame of the present invention has little shaking, is safe and reliable, and is easy to fold and fold flexibly. Whether the seat assembly 5 is installed forward in the forward position or backward in the reverse position, the stroller frame can be conveniently folded.

[0047] like Figures 10 to 12 As shown, the seat connection seat 51 is provided with a linkage block 54 that can trigger the unlocking linkage member 45 to move when the seat portion 52 rotates and folds. When the child stroller frame needs to be folded, the second latch assembly 56 is first unlocked, the backrest 55 is brought close to the seat portion 52, and then the first latch assembly 53 is unlocked, the seat portion 52 rotates relative to the seat connection seat 51, and during the process of the seat portion 52 rotating and approaching the first leg 11, the linkage block 54 in the seat connection seat 51 pushes and triggers the unlocking linkage member 45 to move, thereby causing the locking rod 40 to rotate. At this time, the locking device is unlocked, and the child stroller frame can be automatically folded. Therefore, the unlocking action of the locking device is linked with the rotating action of the seat portion 52, ensuring that the unlocking operation of the child stroller frame is convenient and quick. After the locking device is unlocked, the push rod assembly 13 can automatically rotate relative to the second leg 12 and drive the first leg 11 to automatically rotate and approach the second leg 12, so as to realize automatic folding, and the folding is very flexible.

[0048] like Figures 10 to 12As shown, the seat portion 52 is provided with a convex shaft 521 which can rotate with the seat connecting seat 51, and the convex shaft 521 is provided with a pushing surface 522 which can push the linkage block 54 to move when the seat portion 52 rotates. When the seat portion 52 rotates relative to the seat connecting seat 51, the convex shaft 521 rotates together, and the pushing surface 522 thereon pushes the linkage block 54 to move downward, and the linkage block 54 pushes the unlocking linkage member 45, so that the locking device is unlocked. The locking device is unlocked only by rotating and folding the seat portion 52, and the user does not need to operate the locking device to unlock, so that the child stroller frame is convenient and quick to fold.

[0049] like Figure 6 and Figure 7 As shown, the unlocking linkage member 45 includes a sliding block 451 that can slide relative to the seat connection part 24 and can be pushed by the linkage block 54. The sliding block 451 is provided with a protruding shaft 452. The locking rod 40 is provided with a connecting hole 453 that is movably connected to the protruding shaft 452. When the sliding block 451 slides downward, the protruding shaft 452 pushes the hole wall of the connecting hole 453 to rotate the locking rod 40. The connecting hole 453 is a non-circular hole. When the protruding shaft 452 pushes the hole wall of the connecting hole 453, the protruding shaft 452 can slide relative to the hole wall of the connecting hole 453. When the linkage block 54 pushes the sliding block 451 to slide downward, the protruding shaft 452 pushes the hole wall of the connecting hole 453 and slides relative to the hole wall, which can make the locking rod 40 rotate relative to the second connecting seat 22, thereby achieving unlocking. Furthermore, the linear motion of the sliding block 451 is converted into the rotational motion of the locking rod 40 through the cooperation between the protruding shaft 452 and the connecting hole 453 , which is an ingenious design.

[0050] like Figures 6 to 8 As shown, the locking rod 40 includes a bent body 401, the first locking portion 41 is a hook disposed at one end of the body 401 and bent downward, the second locking portion 42 is a protrusion disposed at the other end of the body 401 and tilted upward, and the first locking position 43 and the second locking position 44 are slots disposed on the outer circumferences of the first connecting seat 21 and the third connecting seat 23. The hook clamps the slot on the first connecting seat 21 downward and the protrusion clamps the slot on the third connecting seat 23 upward, so that the child stroller frame is locked very firmly in the unfolded state, reducing the shaking of the child stroller frame, and is safe and reliable.

[0051] like Fig.11 and Fig.12As shown, the second locking assembly 56 includes a locking groove (not shown) provided on the seat portion 52, a locking shaft 561 that can slide therein and engage or disengage with the locking groove is provided in the backrest portion 55, a switch 562 is provided on the backrest portion 55, a pull cord 563 that can pull the locking shaft to disengage from the locking groove is provided between the switch 562 and the locking shaft 561, and a fourth reset spring 564 that can push the locking shaft 561 to slide and reset is also provided in the backrest portion 55. The second locking assembly 56 is unlocked by operating the switch 562 to pull the pull cord 563, and the locking shaft 561 is disengaged from the locking groove, and the backrest portion 55 can be rotated and folded at this time. There can be multiple locking grooves and they are provided on the seat portion 52 along the circumferential direction, so that different tilting gears of the backrest portion 55 can be adjusted.

[0052] like Figures 11 to 13 As shown, the first locking assembly 53 includes a first locking groove 531 arranged on the seat portion 52 along the circumferential direction, a second locking groove 532 is arranged on the seat connecting seat 51 along the circumferential direction, a locking piece 533 which can move laterally and can engage with the first locking groove 531 and the second locking groove 532 at the same time is arranged between the seat portion 52 and the seat connecting seat 51, a first inclined surface 534 is arranged on the locking piece 533 along the circumferential direction, the backrest portion 55 is arranged between the seat portion 52 and the seat connecting seat 51, a protrusion 57 is arranged at the lower end of the backrest portion 55 which can push the first inclined surface 534 to disengage the locking piece 533 from the second locking groove 532 when the backrest portion 55 is rotated and folded relative to the seat portion 52, and a second reset spring 535 which can push the locking piece 533 to move and reset is also arranged between the seat portion 52 and the locking piece 533. When the backrest portion 55 is rotated and folded, the protrusion 57 thereon pushes the first inclined surface 534, thereby disengaging the locking member 533 from the second locking groove 532. At this time, the first locking drill 53 is unlocked, and the seat portion 52 can be rotated relative to the seat connecting base 51 and moved closer to the first leg 11. During this disengagement, the linkage block 54 can trigger the unlocking linkage member 45, thereby unlocking the locking device.

[0053] like Figure 1 , Fig. 9 , Fig.11 and Fig.12 As shown, a front armrest 58 is provided between the backrest 55 and the seat connection base 52, and a plurality of third locking grooves 536 are provided on the front armrest 58 along the circumferential direction, and a latching tooth 537 capable of engaging with or disengaging from the third locking groove 546 is provided on the latching member 544, and when the latching member 533 is disengaged from the second locking groove 532, the latching tooth 537 is disengaged from the third locking groove 536. Therefore, when the backrest 55 is rotated and folded and the pushing latching member 533 is disengaged from the second locking groove 532, the latching tooth 537 is also disengaged from the third locking groove 536, so that the front armrest 58 can also be rotated and folded.

[0054] like Figures 10 to 12 As shown, the seat connecting seat 51 is plug-connected with the seat connecting part 24, the seat connecting part 24 is provided with a slot 241 for the seat connecting seat 51 to be inserted, the seat connecting part 24 is also provided with a transverse clamping hole 242, the seat connecting seat 51 is provided with a clamping block 511 which can be moved transversely to engage with or disengage from the clamping hole 242, the seat connecting seat 51 is also provided with an exposed button 512 which can push the clamping block 511 to disengage from the clamping hole 242 when pressed, and a third reset spring 513 is provided between the seat connecting seat 51 and the clamping block 511 which can push the clamping block 511 to slide and reset.

[0055] like Fig. 9 , Figures 14 to 16 As shown, the backrest 55 includes a U-shaped backrest rod 551, on which a rotatable ceiling support frame 555 is provided, the open end of the backrest rod 551 is rotatably connected to the seat portion 52, the backrest rod 551 is provided with a rear side frame 552 protruding backwards, the rear side frame 552 is provided with a support plate 553 that can slide up and down relative to it, the support plate 553 is provided with a mounting hole 554 for threading a safety belt, and a positioning structure that can position the support plate 553 is provided between the support plate 553 and the rear side frame 552. The support plate 553 can be adjusted in height, so that the threading of the safety belt can also be adjusted in height, which can ensure that children of different heights can wear the safety belt comfortably when riding. For example, when a tall child rides, the support plate 553 is adjusted high, and when a small child rides, the support plate 553 is adjusted low.

[0056] As shown Figures 14 to 16 As shown, the positioning structure includes an extension groove 501 extending up and down along the rear side frame 552, a plurality of mutually spaced positioning grooves 502 are provided on the two side walls of the extension groove 501, a protruding seat 503 is provided on the support plate 553, which is inserted into the extension groove 501 and can slide up and down in the extension groove 501, and a protrusion 504 is provided on the protruding seat 503, which can cooperate with the positioning groove 502 for positioning. When the protrusion 504 is engaged with one of the positioning grooves 502, the height of the support plate 553 is positioned. When adjustment is required, the support plate 553 only needs to be slightly pulled up and down to make the protrusion 504 withdraw from one positioning groove 502 and enter another positioning groove 502, which is convenient for adjustment.

[0057] like Fig. 9 , Fig.14 and Fig.16As shown, the rear side frame 552 includes an extension frame 5521 extending up and down, and the lower end of the extension frame 5521 is provided with a left frame 5522 and a right frame 5523 extending to both sides, the left frame 5522 and the right frame 5523 are connected to the lower side of the backrest rod 551, the upper end of the extension frame 5521 is connected to the upper end of the backrest rod 551, and the extension groove 501 is set on the extension frame 5521.

[0058] like Fig.17 As shown, the backrest rod 551 is provided with a socket 5511 with a T-shaped cross-section, and the left side frame 5522 and the right side frame 5523 are provided with plug-in grooves (not shown in the figure) that can be plugged with the socket 5511. The upper end of the extension frame 5521 is provided with a bending portion 5525. When the left side frame 5522 and the right side frame 5523 are plugged with the socket 5511, the lower side surface of the bending portion 5525 is in contact with the upper end surface of the backrest rod 551. The whole structure is firmly connected and is convenient to assemble. When the bending portion 5525 is in contact with the upper end surface of the backrest rod 551, it can be locked by screws.

[0059] When the child stroller frame needs to be folded, the upper push rod 132 is first slid to retract the upper push rod 132 into the lower push rod 131, and then the switch 562 is operated to unlock the second locking assembly 56 and rotate the folding backrest 55 forward. The backrest 55 drives the first locking assembly 53 to unlock during the rotation and folding process. At this time, the seat portion 52 rotates relative to the seat connecting seat 51. During the rotation process, the seat portion 52 pushes the linkage block 54 to move through the pushing surface 522, and the linkage block 54 pushes the unlocking linkage member 45 to move, thereby unlocking the locking device of the child stroller frame. After the locking device is unlocked, the push rod assembly 13 rotates relative to the second leg 12 under the action of its own gravity. In this process, the first leg 11 is driven to move closer to the second leg 12 through the transmission plate 31, and finally the wheel 10 and the hand push handle 133 are against the ground, so that the child stroller frame in the folded state remains standing. The child stroller frame can be automatically folded and kept standing by just sliding the upper push rod 132 and rotating the backrest 55 forward. The whole folding process is very simple.

[0060] The present embodiment is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiment, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the present purpose.

Claims

1. A child stroller frame, which can be moved from an unfolded position to a folded position after a locking device is unlocked, characterized in that: The invention comprises a first leg (11) and a second leg (12) having a wheel (10); a first connecting seat (21) is fixedly provided on the upper end of the first leg (11); a second connecting seat (22) is fixedly provided on the upper end of the second leg (12); the first connecting seat (21) and the second connecting seat (22) are rotatably connected; a third connecting seat (23) is rotatably connected to the second connecting seat (22); a push rod assembly (13) is fixedly connected to the third connecting seat (23); a transmission member (3) is provided between the third connecting seat (23) and the first connecting seat (21) and can drive the first leg (11) to rotate toward the second leg (12) when the push rod assembly (131) rotates toward the second leg (12); the locking device comprises a locking rod (40) whose middle part is rotatably connected to the second connecting seat (22); ), a first locking portion (41) is provided at one end of the locking rod (40), a second locking portion (42) is provided at the other end of the locking rod (40), a first locking position (43) capable of engaging with the first locking portion (41) is provided on the first connecting seat (21), a second locking position (44) capable of engaging with the second locking portion (42) when the first locking portion (41) is engaged with the first locking position (43) is provided on the third connecting seat (23), an unlocking linkage (45) capable of triggering the locking rod (40) to rotate so that the first locking position (43) is disengaged from the first locking portion (41) and the second locking position (44) is disengaged from the second locking portion (42) is also provided on the second connecting seat (22), and the locking device further comprises a first reset spring (46) connected to the second connecting seat (22) and capable of pushing the locking rod (40) to rotate and reset.

2. The child stroller frame according to claim 1, characterized in that: The second connecting seat (22) is provided with a seat connecting portion (24), and the seat connecting portion (24) is detachably connected to a seat assembly (5), and the seat assembly (5) includes a seat connecting seat (51) detachably connected to the seat connecting portion (24), and the seat connecting seat (51) is connected to a seat portion (52) that can rotate relative to the seat connecting seat, and a first locking assembly (53) is provided between the seat portion (52) and the seat connecting seat (51), and a linkage block (54) is provided in the seat connecting seat (51) that can trigger the movement of the unlocking linkage member (45) when the seat portion (52) is rotated and retracted.

3. The child stroller frame according to claim 2, characterized in that: The rear side of the seat portion (52) is provided with a backrest portion (55) which can rotate relative to the seat portion (52), and a second locking assembly (56) is provided between the backrest portion (55) and the seat portion (52).

4. The child stroller frame according to claim 3, characterized in that: The first locking assembly (53) comprises a first locking groove (531) arranged on the seat portion (52) along the circumferential direction, a second locking groove (532) is arranged on the seat connecting seat (51) along the circumferential direction, a locking member (533) is arranged between the seat portion (52) and the seat connecting seat (51) and can move laterally and can be engaged with the first locking groove (531) and the second locking groove (532) at the same time, a first inclined surface (534) is arranged on the locking member (533) along the circumferential direction, the backrest portion (55) is arranged between the seat portion (52) and the seat connecting seat (51), and a lower end of the backrest portion (55) is provided with a member that can push the first inclined surface (534) when the backrest portion (55) is rotated and folded relative to the seat portion (52). A protrusion (57) is provided on the locking member (534) to disengage the locking member (533) from the second locking groove (532); a second return spring (535) is provided between the seat portion (52) and the locking member (533) and can push the locking member (533) to move and return; a front armrest (58) is provided between the backrest portion (55) and the seat connecting seat (52); a plurality of third locking grooves (536) are provided on the front armrest (58) along the circumferential direction; a locking tooth (537) is provided on the locking member (544) and can engage with or disengage from the third locking groove (546); and when the locking member (533) is disengaged from the second locking groove (532), the locking tooth (537) is disengaged from the third locking groove (536).

5. The child stroller frame according to claim 2, characterized in that: The seat portion (52) is provided with a convex shaft (521) which can rotate with the seat connecting seat (51), and the convex shaft (521) is provided with a pushing surface (522) which can push the linkage block (54) to move when the convex shaft (521) rotates.

6. The child stroller frame according to claim 2, characterized in that: The unlocking linkage member (45) comprises a sliding block (451) which can slide relative to the seat connecting portion (24) and can be pushed by the linkage block (54); the sliding block (451) is provided with a protruding shaft (452); the locking rod (40) is provided with a connecting hole (453) movably connected to the protruding shaft (452); when the sliding block (451) slides downward, the protruding shaft (452) pushes the wall of the connecting hole (453) to rotate the locking rod (40).

7. The child stroller frame according to claim 6, characterized in that: The connecting hole (453) is a non-circular hole, and when the protruding shaft (452) pushes the hole wall of the connecting hole (453), the protruding shaft (452) can slide relative to the hole wall of the connecting hole (453).

8. The child stroller frame according to any one of claims 1 to 7, characterized in that: The transmission member (3) comprises a transmission plate (31), one end of the transmission plate (31) is pivotally connected to the first connecting seat (21), and the rotation axis of the transmission plate (31) and the first connecting seat (21) deviates from the rotation axis of the first connecting seat (21) and the second connecting seat (22); the other end of the transmission plate (31) is pivotally connected to the third connecting seat (23), and the rotation axis of the transmission plate (31) and the third connecting seat (23) deviates from the rotation axis of the third connecting seat (23) and the second connecting seat (22).

9. The child stroller frame according to any one of claims 1 to 7, characterized in that: The locking rod (40) comprises a bent body (401), the first locking portion (41) is a hook disposed at one end of the body (401) and bent downward, the second locking portion (42) is a protrusion disposed at the other end of the body (401) and tilted upward, and the first locking position (43) and the second locking position (44) are slots disposed on the outer peripheral surfaces of the first connecting seat (21) and the third connecting seat (23).

10. The child stroller frame according to claim 3, characterized in that: The backrest portion (55) comprises a U-shaped backrest rod (551), the open end of the backrest rod (551) is rotatably connected to the seat portion (52), the backrest rod (551) is provided with a rear side frame (552) protruding backwards, the rear side frame (552) is provided with a support plate (553) that can slide up and down relative to the rear side frame, the support plate (553) is provided with a mounting hole (554) for inserting a safety belt, and a positioning structure that can position the support plate (553) is provided between the support plate (553) and the rear side frame (552).

Images